/* ===== Fibonacci Math Olympiad - Main Stylesheet ===== */

:root {
    --primary: #1a73e8;
    --primary-dark: #1557b0;
    --primary-light: #e8f0fe;
    --secondary: #f4b400;
    --secondary-dark: #c99400;
    --dark: #1a1a2e;
    --dark-2: #16213e;
    --success: #34a853;
    --danger: #ea4335;
    --warning: #fbbc04;
    --info: #4285f4;
    --gray-50: #f8f9fa;
    --gray-100: #f1f3f4;
    --gray-200: #e8eaed;
    --gray-300: #dadce0;
    --gray-400: #bdc1c6;
    --gray-500: #9aa0a6;
    --gray-600: #80868b;
    --gray-700: #5f6368;
    --gray-800: #3c4043;
    --gray-900: #202124;
    --white: #ffffff;
    --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
    --radius: 12px;
    --radius-sm: 8px;
    --radius-lg: 16px;
    --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.1), 0 5px 10px rgba(0,0,0,0.04);
    --transition: all 0.3s ease;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
    font-family: var(--font);
    color: var(--gray-800);
    background: var(--gray-50);
    line-height: 1.6;
    min-height: 100vh;
}

a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--primary-dark); }

img { max-width: 100%; height: auto; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* ===== Buttons ===== */
.btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 10px 20px; border: 2px solid transparent;
    border-radius: var(--radius-sm); font-size: 14px; font-weight: 600;
    cursor: pointer; transition: var(--transition); text-align: center;
    justify-content: center; line-height: 1.4;
}
.btn:hover { transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn-primary { background: var(--primary); color: var(--white); border-color: var(--primary); }
.btn-primary:hover { background: var(--primary-dark); color: var(--white); }
.btn-success { background: var(--success); color: var(--white); border-color: var(--success); }
.btn-danger { background: var(--danger); color: var(--white); border-color: var(--danger); }
.btn-danger:hover { background: #d32f2f; }
.btn-info { background: #17a2b8; color: var(--white); border-color: #17a2b8; }
.btn-info:hover { background: #138496; }
.btn-warning { background: var(--warning); color: var(--dark); }
.btn-outline { background: transparent; color: var(--primary); border-color: var(--primary); }
.btn-outline:hover { background: var(--primary); color: var(--white); }
.btn-block { display: flex; width: 100%; }
.btn-lg { padding: 14px 28px; font-size: 16px; }
.btn-sm { padding: 6px 12px; font-size: 12px; }

/* ===== Header ===== */
.main-header {
    background: var(--white); border-bottom: 1px solid var(--gray-200);
    position: sticky; top: 0; z-index: 100; box-shadow: var(--shadow);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 70px; }

.logo { display: flex; align-items: center; gap: 12px; }
.logo-icon { width: 42px; height: 42px; background: linear-gradient(135deg, var(--primary), var(--secondary)); border-radius: 12px; display: flex; align-items: center; justify-content: center; color: var(--white); font-size: 20px; }
.logo-text { display: flex; flex-direction: column; }
.logo-title { font-size: 18px; font-weight: 800; color: var(--dark); line-height: 1.2; }
.logo-subtitle { font-size: 11px; color: var(--gray-600); font-weight: 500; }

.main-nav ul { display: flex; align-items: center; list-style: none; gap: 4px; }
.nav-link { padding: 8px 16px; color: var(--gray-700); font-weight: 500; font-size: 14px; border-radius: var(--radius-sm); display: flex; align-items: center; gap: 6px; }
.nav-link:hover { background: var(--gray-100); color: var(--primary); }
.nav-btn { padding: 8px 20px !important; }

.user-menu { position: relative; }
.user-avatar-small { width: 32px; height: 32px; background: linear-gradient(135deg, var(--primary), var(--secondary)); border-radius: 50%; display: flex; align-items: center; justify-content: center; color: var(--white); font-size: 13px; font-weight: 700; }
.dropdown-menu { position: absolute; top: 100%; right: 0; background: var(--white); border-radius: var(--radius); box-shadow: var(--shadow-lg); min-width: 200px; padding: 8px 0; display: none; border: 1px solid var(--gray-200); }
.user-menu.open .dropdown-menu { display: block; }
.dropdown-menu a { display: flex; align-items: center; gap: 10px; padding: 10px 16px; color: var(--gray-700); font-size: 14px; }
.dropdown-menu a:hover { background: var(--gray-100); color: var(--primary); }
.dropdown-menu hr { border: none; border-top: 1px solid var(--gray-200); margin: 4px 0; }

.mobile-menu-toggle { display: none; background: none; border: none; font-size: 24px; cursor: pointer; color: var(--gray-700); }

/* ===== Language Selector ===== */
.lang-selector { position: relative; margin-left: 8px; }
.lang-selector-btn { background: none; border: 1px solid var(--gray-300); border-radius: 8px; padding: 6px 10px; cursor: pointer; display: flex; align-items: center; gap: 4px; font-size: 14px; transition: var(--transition); }
.lang-selector-btn:hover { border-color: var(--primary); background: var(--primary-light); }
.current-flag { font-size: 20px; line-height: 1; }
.lang-selector-btn .fa-chevron-down { font-size: 10px; color: var(--gray-500); }
.lang-dropdown { position: absolute; top: 100%; right: 0; background: #fff; border: 1px solid var(--gray-200); border-radius: 12px; box-shadow: var(--shadow-lg); padding: 8px; min-width: 200px; max-height: 450px; overflow-y: auto; display: none; z-index: 1000; }
.lang-dropdown.show { display: block; }
.lang-option { display: flex; align-items: center; gap: 10px; padding: 6px 12px; border-radius: 8px; text-decoration: none; color: var(--gray-700); font-size: 13px; transition: var(--transition); }
.lang-option:hover { background: var(--gray-100); }
.lang-option.active { background: var(--primary-light); color: var(--primary); font-weight: 600; }
.lang-flag { font-size: 20px; line-height: 1; }

/* ===== Alerts ===== */
.alert {
    padding: 14px 20px; border-radius: var(--radius-sm); margin: 16px auto;
    display: flex; align-items: center; gap: 10px; font-size: 14px;
    animation: slideDown 0.3s ease; position: relative; max-width: 1200px;
}
.alert-success { background: #e6f4ea; color: #1e7e34; border-left: 4px solid var(--success); }
.alert-danger { background: #fce8e6; color: #c5221f; border-left: 4px solid var(--danger); }
.alert-warning { background: #fef7e0; color: #e37400; border-left: 4px solid var(--warning); }
.alert-info { background: var(--primary-light); color: var(--primary); border-left: 4px solid var(--primary); }
.alert-close { position: absolute; right: 12px; top: 50%; transform: translateY(-50%); background: none; border: none; font-size: 20px; cursor: pointer; opacity: 0.5; }

@keyframes slideDown { from { opacity: 0; transform: translateY(-10px); } to { opacity: 1; transform: translateY(0); } }

/* ===== Forms ===== */
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 13px; font-weight: 600; color: var(--gray-700); margin-bottom: 6px; }
.form-group input, .form-group select, .form-group textarea {
    width: 100%; padding: 10px 14px; border: 1.5px solid var(--gray-300);
    border-radius: var(--radius-sm); font-size: 14px; font-family: var(--font);
    transition: var(--transition); background: var(--white);
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
    border-color: var(--primary); outline: none; box-shadow: 0 0 0 3px rgba(26,115,232,0.1);
}
.form-group small { display: block; margin-top: 4px; font-size: 12px; color: var(--gray-500); }
.form-group input:disabled { background: var(--gray-100); cursor: not-allowed; }

.form-row { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
.form-row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-row-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 16px; }
.form-link { font-size: 13px; color: var(--primary); }

.password-input { position: relative; }
.password-toggle { position: absolute; right: 12px; top: 50%; transform: translateY(-50%); background: none; border: none; cursor: pointer; color: var(--gray-500); }

.checkbox-label { display: flex; align-items: center; gap: 8px; font-size: 14px; cursor: pointer; }
.checkbox-label input[type="checkbox"] { width: 18px; height: 18px; accent-color: var(--primary); }

.radio-group { display: flex; gap: 16px; flex-wrap: wrap; }
.radio-label { display: flex; align-items: center; gap: 6px; font-size: 14px; cursor: pointer; }

.form-help { font-size: 13px; color: var(--gray-600); margin-bottom: 10px; }

/* ===== Hero Section ===== */
.hero-section {
    color: var(--white); padding: 100px 0 80px; position: relative; overflow: hidden; min-height: 600px;
}
.hero-bg { position: absolute; inset: 0; }
.hero-bg-img { width: 100%; height: 100%; object-fit: cover; }
.hero-overlay { position: absolute; inset: 0; background: linear-gradient(135deg, rgba(26,26,46,0.92) 0%, rgba(22,33,62,0.85) 100%); }

.hero-content { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; position: relative; z-index: 1; }
.hero-badge { display: inline-flex; align-items: center; gap: 8px; padding: 8px 20px; background: rgba(255,255,255,0.1); border-radius: 24px; font-size: 13px; margin-bottom: 20px; border: 1px solid rgba(255,255,255,0.2); backdrop-filter: blur(10px); }
.hero-section h1 { font-size: 50px; font-weight: 800; line-height: 1.15; margin-bottom: 24px; letter-spacing: -0.5px; }
.text-gradient { background: linear-gradient(135deg, var(--secondary), #ff6b6b); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-section p { font-size: 18px; color: rgba(255,255,255,0.85); margin-bottom: 36px; line-height: 1.7; max-width: 520px; }
.hero-buttons { display: flex; gap: 16px; margin-bottom: 32px; }
.btn-hero-outline { background: transparent; color: var(--white); border: 2px solid rgba(255,255,255,0.4); padding: 12px 28px; border-radius: var(--radius-sm); font-weight: 600; font-size: 15px; transition: var(--transition); cursor: pointer; display: inline-flex; align-items: center; gap: 8px; }
.btn-hero-outline:hover { background: rgba(255,255,255,0.15); border-color: rgba(255,255,255,0.6); color: var(--white); }

.hero-trust { display: flex; align-items: center; gap: 12px; }
.hero-trust-avatars { display: flex; }
.trust-avatar { width: 36px; height: 36px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 14px; color: var(--white); border: 2px solid rgba(26,26,46,0.8); margin-right: -10px; }
.hero-trust-text { font-size: 14px; color: rgba(255,255,255,0.7); margin-left: 10px; }

.hero-image { position: relative; }
.hero-photo-main { width: 100%; height: 420px; object-fit: cover; border-radius: var(--radius-lg); border: 4px solid rgba(255,255,255,0.15); box-shadow: 0 25px 50px rgba(0,0,0,0.4); }
.hero-cards-float { position: absolute; bottom: -20px; left: -30px; right: 20px; display: flex; flex-direction: column; gap: 12px; }
.hero-card { background: rgba(255,255,255,0.12); backdrop-filter: blur(16px); border-radius: var(--radius); padding: 16px 20px; display: flex; align-items: center; gap: 14px; border: 1px solid rgba(255,255,255,0.2); transition: var(--transition); max-width: 300px; }
.hero-card:hover { background: rgba(255,255,255,0.2); transform: translateX(8px); }
.hero-card-icon { width: 44px; height: 44px; background: var(--primary); border-radius: 12px; display: flex; align-items: center; justify-content: center; font-size: 18px; flex-shrink: 0; }
.hero-card-icon.success { background: var(--success); }
.hero-card-icon.warning { background: var(--secondary); }
.hero-card h3 { font-size: 14px; margin-bottom: 2px; }
.hero-card p { font-size: 12px; color: rgba(255,255,255,0.7); margin: 0; }

.floating { animation: float 3s ease-in-out infinite; }
.delay-1 { animation-delay: 0.5s; }
.delay-2 { animation-delay: 1s; }
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }

/* ===== Stats Section ===== */
.stats-section { padding: 0; background: var(--white); position: relative; z-index: 2; margin-top: -50px; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; background: var(--white); border-radius: var(--radius-lg); box-shadow: 0 20px 60px rgba(0,0,0,0.1); overflow: hidden; }
.stat-card { text-align: center; padding: 40px 20px; transition: var(--transition); position: relative; }
.stat-card:not(:last-child)::after { content: ''; position: absolute; right: 0; top: 20%; height: 60%; width: 1px; background: var(--gray-200); }
.stat-card:hover { background: var(--primary-light); }
.stat-icon { font-size: 28px; color: var(--primary); margin-bottom: 12px; width: 56px; height: 56px; border-radius: 50%; background: var(--primary-light); display: inline-flex; align-items: center; justify-content: center; }
.stat-number { font-size: 36px; font-weight: 800; color: var(--dark); }
.stat-label { font-size: 14px; color: var(--gray-600); margin-top: 4px; }

/* ===== Section Headers ===== */
.section-header { text-align: center; margin-bottom: 48px; }
.section-tag { display: inline-block; padding: 6px 16px; background: var(--primary-light); color: var(--primary); border-radius: 20px; font-size: 13px; font-weight: 600; margin-bottom: 12px; }
.section-header h2 { font-size: 36px; font-weight: 800; color: var(--dark); margin-bottom: 12px; }
.section-header p { font-size: 16px; color: var(--gray-600); max-width: 600px; margin: 0 auto; }

/* ===== Categories Section ===== */
.categories-section { padding: 100px 0 80px; }
.categories-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 32px; }
.category-card { background: var(--white); border-radius: var(--radius-lg); text-align: center; box-shadow: var(--shadow); transition: var(--transition); border: 1px solid var(--gray-200); overflow: hidden; }
.category-card:hover { transform: translateY(-8px); box-shadow: 0 20px 40px rgba(0,0,0,0.12); border-color: var(--primary); }
.category-card.has-image { text-align: left; }
.category-card-img { position: relative; height: 200px; overflow: hidden; }
.category-card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s ease; }
.category-card:hover .category-card-img img { transform: scale(1.08); }
.category-card-overlay { position: absolute; inset: 0; background: linear-gradient(180deg, transparent 40%, rgba(0,0,0,0.4) 100%); display: flex; align-items: flex-end; justify-content: flex-start; padding: 20px; }
.category-card-overlay i { font-size: 32px; color: var(--white); background: var(--primary); width: 56px; height: 56px; border-radius: 50%; display: flex; align-items: center; justify-content: center; box-shadow: 0 4px 15px rgba(26,115,232,0.4); }
.category-card-body { padding: 28px; }
.category-icon { font-size: 40px; color: var(--primary); margin-bottom: 20px; }
.category-card h3 { font-size: 22px; font-weight: 700; margin-bottom: 6px; color: var(--dark); }
.category-grade { color: var(--secondary-dark); font-weight: 600; margin-bottom: 12px; font-size: 14px; }
.category-card p { font-size: 14px; color: var(--gray-600); margin-bottom: 20px; line-height: 1.6; }

/* ===== Exams Grid ===== */
.exams-preview-section, .exams-section { padding: 80px 0; }
.exams-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 24px; }
.exam-card { background: var(--white); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); transition: var(--transition); border: 1px solid var(--gray-200); }
.exam-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); }
.exam-card-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
.exam-category-badge { display: inline-block; padding: 4px 12px; background: var(--primary-light); color: var(--primary); border-radius: 20px; font-size: 12px; font-weight: 600; }
.exam-category-badge.small { font-size: 11px; padding: 2px 8px; }
.exam-grade { font-size: 12px; color: var(--gray-500); }
.exam-card h3 { font-size: 18px; font-weight: 700; color: var(--dark); margin-bottom: 8px; }
.exam-desc { font-size: 14px; color: var(--gray-600); margin-bottom: 16px; }
.exam-meta { display: flex; gap: 16px; font-size: 13px; color: var(--gray-600); margin-bottom: 20px; flex-wrap: wrap; }
.exam-meta i { color: var(--primary); }
.exam-user-status { display: flex; justify-content: space-between; align-items: center; padding: 10px 0; border-top: 1px solid var(--gray-200); margin-bottom: 16px; }
.exam-best-score .label { font-size: 12px; color: var(--gray-500); }
.exam-best-score .score { font-weight: 700; font-size: 16px; }
.exam-best-score .score.passed { color: var(--success); }
.exam-best-score .score.failed { color: var(--danger); }
.exam-attempts { font-size: 12px; color: var(--gray-500); }

/* ===== Photo Banner ===== */
.photo-banner { position: relative; height: 300px; overflow: hidden; }
.photo-banner img { width: 100%; height: 100%; object-fit: cover; }
.photo-banner-overlay { position: absolute; inset: 0; background: linear-gradient(90deg, rgba(26,26,46,0.85) 0%, rgba(26,115,232,0.6) 50%, transparent 100%); display: flex; align-items: center; }
.banner-text { color: var(--white); max-width: 500px; }
.banner-text h2 { font-size: 30px; font-weight: 800; margin-bottom: 12px; }
.banner-text h2 i { margin-right: 10px; color: var(--secondary); }
.banner-text p { font-size: 16px; opacity: 0.9; line-height: 1.7; }

/* ===== Features Section ===== */
.features-section { padding: 80px 0; background: var(--white); }
.feature-row { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; margin-bottom: 60px; }
.feature-row.reverse { direction: rtl; }
.feature-row.reverse > * { direction: ltr; }
.feature-row:last-child { margin-bottom: 0; }
.feature-row-img img { width: 100%; height: 350px; object-fit: cover; border-radius: var(--radius-lg); box-shadow: var(--shadow-lg); }
.feature-row-content { display: flex; flex-direction: column; gap: 24px; }
.feature-card-inline { display: flex; gap: 16px; align-items: flex-start; padding: 20px; border-radius: var(--radius); transition: var(--transition); }
.feature-card-inline:hover { background: var(--gray-50); transform: translateX(6px); }
.feature-icon { font-size: 22px; color: var(--primary); width: 52px; height: 52px; border-radius: 14px; background: var(--primary-light); display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.feature-card-inline h3 { font-size: 17px; margin-bottom: 6px; color: var(--dark); font-weight: 700; }
.feature-card-inline p { font-size: 14px; color: var(--gray-600); line-height: 1.6; margin: 0; }

/* ===== CTA Section ===== */
.cta-section { position: relative; padding: 100px 0; overflow: hidden; margin-top: 0; }
.cta-bg { position: absolute; inset: 0; }
.cta-bg img { width: 100%; height: 100%; object-fit: cover; }
.cta-overlay { position: absolute; inset: 0; background: linear-gradient(135deg, rgba(26,115,232,0.9) 0%, rgba(22,33,62,0.92) 100%); }
.cta-content { position: relative; z-index: 1; text-align: center; color: var(--white); max-width: 650px; margin: 0 auto; }
.cta-icon { font-size: 40px; margin-bottom: 20px; width: 80px; height: 80px; border-radius: 50%; background: rgba(255,255,255,0.15); display: inline-flex; align-items: center; justify-content: center; backdrop-filter: blur(10px); }
.cta-content h2 { font-size: 36px; font-weight: 800; margin-bottom: 16px; }
.cta-content p { font-size: 18px; opacity: 0.9; margin-bottom: 32px; line-height: 1.7; }
.btn-cta { background: var(--white); color: var(--primary); border-color: var(--white); font-weight: 700; }
.btn-cta:hover { background: var(--secondary); color: var(--dark); border-color: var(--secondary); }

/* ===== Filter Bar ===== */
.filter-bar { display: flex; gap: 8px; margin-bottom: 32px; flex-wrap: wrap; }
.filter-btn { padding: 8px 20px; border-radius: 20px; font-size: 14px; font-weight: 500; color: var(--gray-700); background: var(--white); border: 1px solid var(--gray-300); transition: var(--transition); }
.filter-btn:hover, .filter-btn.active { background: var(--primary); color: var(--white); border-color: var(--primary); }

/* ===== Page Header ===== */
.page-header-section { background: linear-gradient(135deg, var(--dark), var(--dark-2)); color: var(--white); padding: 48px 0; }
.page-header-section h1 { font-size: 32px; margin-bottom: 8px; }
.page-header-section p { color: rgba(255,255,255,0.7); font-size: 16px; }

/* ===== Auth Styles ===== */
.auth-section { padding: 40px 0; min-height: calc(100vh - 200px); display: flex; align-items: center; }
.auth-container { display: grid; grid-template-columns: 1fr 1fr; max-width: 1000px; margin: 0 auto; background: var(--white); border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-lg); }
.register-container { max-width: 1100px; }
.auth-card { padding: 48px 40px; }
.auth-header { text-align: center; margin-bottom: 32px; }
.auth-logo { font-size: 40px; color: var(--primary); margin-bottom: 16px; }
.auth-header h2 { font-size: 28px; color: var(--dark); }
.auth-header p { color: var(--gray-600); font-size: 14px; }
.auth-form { margin-bottom: 24px; }
.auth-footer { text-align: center; font-size: 14px; color: var(--gray-600); }
.auth-footer a { color: var(--primary); font-weight: 600; }

.auth-side { background: linear-gradient(135deg, var(--primary), var(--dark-2)); color: var(--white); display: flex; align-items: center; justify-content: center; padding: 48px; }
.auth-side-content { text-align: center; }
.auth-side h2 { font-size: 28px; margin-bottom: 16px; }
.auth-side p { opacity: 0.85; margin-bottom: 24px; }
.auth-features { list-style: none; text-align: left; }
.auth-features li { padding: 8px 0; display: flex; align-items: center; gap: 10px; font-size: 14px; }
.auth-features i { color: var(--secondary); }
.auth-stats { display: flex; gap: 32px; justify-content: center; margin-top: 32px; }
.auth-stat { text-align: center; }
.auth-stat strong { display: block; font-size: 24px; }
.auth-stat span { font-size: 12px; opacity: 0.7; }

/* ===== Dashboard ===== */
.dashboard-section { padding: 40px 0; }
.dashboard-welcome { display: flex; justify-content: space-between; align-items: center; margin-bottom: 32px; }
.dashboard-welcome h1 { font-size: 28px; color: var(--dark); }
.dashboard-welcome p { color: var(--gray-600); }

.dashboard-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-bottom: 32px; }
.dash-stat-card { background: var(--white); border-radius: var(--radius); padding: 24px; display: flex; align-items: center; gap: 16px; box-shadow: var(--shadow); }
.dash-stat-icon { width: 56px; height: 56px; border-radius: 14px; display: flex; align-items: center; justify-content: center; font-size: 24px; color: var(--white); }
.dash-stat-icon.blue { background: linear-gradient(135deg, var(--primary), #4285f4); }
.dash-stat-icon.green { background: linear-gradient(135deg, var(--success), #66bb6a); }
.dash-stat-icon.gold { background: linear-gradient(135deg, var(--secondary), #ffca28); }
.dash-stat-icon.purple { background: linear-gradient(135deg, #7c4dff, #b388ff); }
.dash-stat-info h3 { font-size: 28px; font-weight: 800; color: var(--dark); }
.dash-stat-info p { font-size: 13px; color: var(--gray-600); }

.dashboard-grid { display: grid; grid-template-columns: 2fr 1fr; gap: 24px; }
.dashboard-card { background: var(--white); border-radius: var(--radius); box-shadow: var(--shadow); margin-bottom: 24px; }
.card-header { display: flex; justify-content: space-between; align-items: center; padding: 20px 24px; border-bottom: 1px solid var(--gray-200); }
.card-header h3 { font-size: 16px; font-weight: 700; color: var(--dark); display: flex; align-items: center; gap: 8px; }
.card-link { font-size: 13px; color: var(--primary); font-weight: 500; }
.card-body { padding: 24px; }

/* Performance */
.performance-item { margin-bottom: 20px; }
.performance-header { display: flex; justify-content: space-between; margin-bottom: 6px; }
.performance-name { font-weight: 600; font-size: 14px; }
.performance-score { font-weight: 700; color: var(--primary); font-size: 14px; }
.performance-detail { font-size: 12px; color: var(--gray-500); }

.progress-bar { height: 8px; background: var(--gray-200); border-radius: 4px; overflow: hidden; }
.progress-bar.large { height: 12px; }
.progress-fill { height: 100%; background: linear-gradient(90deg, var(--primary), var(--success)); border-radius: 4px; transition: width 1s ease; }

/* Results List */
.results-list { display: flex; flex-direction: column; gap: 12px; }
.result-item { display: flex; align-items: center; gap: 16px; padding: 12px; border-radius: var(--radius-sm); border: 1px solid var(--gray-200); }
.result-info { flex: 1; }
.result-info h4 { font-size: 14px; margin-bottom: 4px; }
.result-meta { font-size: 12px; color: var(--gray-500); }
.result-score { font-size: 18px; font-weight: 800; padding: 4px 12px; border-radius: var(--radius-sm); }
.result-score.high { color: var(--success); background: #e6f4ea; }
.result-score.medium { color: var(--warning); background: #fef7e0; }
.result-score.low { color: var(--danger); background: #fce8e6; }

/* Points Circle */
.points-card { text-align: center; padding: 32px; }
.points-circle { position: relative; display: inline-block; }
.points-circle svg { width: 120px; height: 120px; }
.points-value { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -60%); font-size: 28px; font-weight: 800; color: var(--dark); }
.points-label { position: absolute; top: 50%; left: 50%; transform: translate(-50%, 40%); font-size: 12px; color: var(--gray-500); }

/* Badges */
.badges-grid-small { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.badge-item { text-align: center; }
.badge-icon { width: 44px; height: 44px; border-radius: 50%; display: flex; align-items: center; justify-content: center; color: var(--white); font-size: 18px; margin: 0 auto 6px; }
.badge-item span { font-size: 11px; color: var(--gray-600); }

/* Quick Links */
.quick-links { display: flex; flex-direction: column; gap: 8px; }
.quick-link { display: flex; align-items: center; gap: 10px; padding: 10px 14px; border-radius: var(--radius-sm); color: var(--gray-700); font-size: 14px; transition: var(--transition); }
.quick-link:hover { background: var(--primary-light); color: var(--primary); }
.quick-link i { width: 20px; text-align: center; }

/* ===== Empty State ===== */
.empty-state { text-align: center; padding: 48px 20px; color: var(--gray-500); }
.empty-state i { font-size: 48px; margin-bottom: 16px; display: block; }
.empty-state h3 { color: var(--gray-700); margin-bottom: 8px; }
.empty-state.small { padding: 20px; }
.empty-state.small i { font-size: 32px; }

/* ===== Exam Start ===== */
.exam-start-section { padding: 40px 0; }
.exam-start-card { max-width: 700px; margin: 0 auto; background: var(--white); border-radius: var(--radius-lg); padding: 48px; box-shadow: var(--shadow-lg); }
.exam-start-header { text-align: center; margin-bottom: 32px; }
.exam-start-icon { font-size: 48px; color: var(--primary); margin-bottom: 16px; }
.exam-start-header h1 { font-size: 28px; color: var(--dark); margin-bottom: 8px; }

.exam-info-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin-bottom: 32px; }
.exam-info-item { display: flex; align-items: center; gap: 12px; padding: 16px; background: var(--gray-50); border-radius: var(--radius-sm); }
.exam-info-item i { font-size: 24px; color: var(--primary); }
.exam-info-item strong { display: block; font-size: 16px; color: var(--dark); }
.exam-info-item span { font-size: 12px; color: var(--gray-500); }

.exam-rules { background: var(--primary-light); padding: 20px; border-radius: var(--radius-sm); margin-bottom: 32px; }
.exam-rules h3 { font-size: 16px; color: var(--primary); margin-bottom: 12px; }
.exam-rules ul { list-style: none; }
.exam-rules li { padding: 4px 0; font-size: 14px; color: var(--gray-700); }
.exam-rules li::before { content: "•"; color: var(--primary); margin-right: 8px; }

.language-selection { margin-bottom: 32px; }
.language-selection h3 { margin-bottom: 16px; font-size: 16px; }
.language-options { display: flex; gap: 12px; flex-wrap: wrap; }
.language-option input[type="radio"] { display: none; }
.language-card { padding: 16px 24px; border: 2px solid var(--gray-300); border-radius: var(--radius-sm); cursor: pointer; display: flex; align-items: center; gap: 10px; transition: var(--transition); }
.language-option input:checked + .language-card { border-color: var(--primary); background: var(--primary-light); }
.lang-flag { font-size: 24px; }
.lang-name { font-size: 14px; font-weight: 600; }

.exam-start-btn { margin-top: 16px; font-size: 18px; padding: 16px; }

/* ===== Exam Interface ===== */
.exam-body { background: var(--gray-100); }
.exam-interface { min-height: 100vh; display: flex; flex-direction: column; }

.exam-topbar { background: var(--white); border-bottom: 1px solid var(--gray-200); padding: 12px 24px; display: flex; align-items: center; justify-content: space-between; position: sticky; top: 0; z-index: 100; box-shadow: var(--shadow); }
.exam-topbar-left { display: flex; align-items: center; gap: 12px; }
.exam-topbar-left h2 { font-size: 16px; color: var(--dark); }
.exam-topbar-center { display: flex; align-items: center; }
.exam-timer { display: flex; align-items: center; gap: 8px; font-size: 24px; font-weight: 800; color: var(--primary); padding: 8px 20px; background: var(--primary-light); border-radius: var(--radius-sm); }
.exam-timer.warning { background: #fef7e0; color: var(--warning); }
.exam-timer.danger { background: #fce8e6; color: var(--danger); animation: pulse 1s infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.7; } }
.exam-topbar-right { display: flex; align-items: center; gap: 16px; }
.exam-progress-text { font-size: 13px; color: var(--gray-600); }

.exam-layout { display: grid; grid-template-columns: 280px 1fr; flex: 1; }

.exam-nav-panel { background: var(--white); padding: 16px; border-right: 1px solid var(--gray-200); height: calc(100vh - 60px); overflow-y: auto; position: sticky; top: 60px; }
.exam-nav-panel h4 { font-size: 14px; color: var(--gray-700); margin-bottom: 12px; }
.question-nav-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 6px; margin-bottom: 16px; }
.q-nav-btn { width: 100%; aspect-ratio: 1; border: 2px solid var(--gray-300); border-radius: var(--radius-sm); background: var(--white); cursor: pointer; font-weight: 600; font-size: 13px; transition: var(--transition); display: flex; align-items: center; justify-content: center; }
.q-nav-btn.current { border-color: var(--primary); background: var(--primary); color: var(--white); }
.q-nav-btn.answered { border-color: var(--success); background: #e6f4ea; color: var(--success); }
.nav-legend { display: flex; flex-direction: column; gap: 8px; font-size: 12px; color: var(--gray-600); }
.legend-dot { display: inline-block; width: 12px; height: 12px; border-radius: 3px; margin-right: 6px; vertical-align: middle; }
.legend-dot.current { background: var(--primary); }
.legend-dot.answered { background: var(--success); }
.legend-dot.empty { background: var(--gray-300); }

.exam-question-area { padding: 32px 48px; max-width: 800px; }
.question-header { margin-bottom: 24px; }
.question-number { font-size: 14px; font-weight: 600; color: var(--primary); padding: 4px 12px; background: var(--primary-light); border-radius: 12px; }
.question-text { font-size: 17px; line-height: 1.8; color: var(--dark); margin-bottom: 24px; }
.question-image { margin: 16px 0; text-align: center; }
.question-image img { max-width: 400px; border-radius: var(--radius-sm); border: 1px solid var(--gray-200); }

.options-list { display: flex; flex-direction: column; gap: 12px; margin-bottom: 32px; }
.option-item { display: flex; align-items: center; gap: 14px; padding: 16px 20px; border: 2px solid var(--gray-200); border-radius: var(--radius-sm); cursor: pointer; transition: var(--transition); background: var(--white); }
.option-item:hover { border-color: var(--primary); background: var(--primary-light); }
.option-item.selected { border-color: var(--primary); background: var(--primary-light); }
.option-item input[type="radio"] { display: none; }
.option-letter { width: 36px; height: 36px; border-radius: 50%; background: var(--gray-200); display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 15px; color: var(--gray-700); flex-shrink: 0; }
.option-item.selected .option-letter { background: var(--primary); color: var(--white); }
.option-text { font-size: 15px; flex: 1; }
.option-image { max-height: 60px; max-width: 200px; vertical-align: middle; border-radius: 4px; }
.solution-option .option-image { max-height: 45px; max-width: 160px; }

.question-actions { display: flex; justify-content: space-between; padding-top: 20px; border-top: 1px solid var(--gray-200); }

/* ===== Modal ===== */
.modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.5); display: flex; align-items: center; justify-content: center; z-index: 1000; backdrop-filter: blur(4px); }
.modal-content { background: var(--white); border-radius: var(--radius-lg); max-width: 500px; width: 90%; max-height: 90vh; overflow-y: auto; }
.modal-content.modal-lg { max-width: 700px; }
.modal-header { padding: 20px 24px; border-bottom: 1px solid var(--gray-200); display: flex; justify-content: space-between; align-items: center; }
.modal-header h3 { font-size: 18px; display: flex; align-items: center; gap: 8px; }
.modal-close { background: none; border: none; font-size: 24px; cursor: pointer; color: var(--gray-500); }
.modal-body { padding: 24px; }
.modal-actions { padding: 16px 24px; border-top: 1px solid var(--gray-200); display: flex; justify-content: flex-end; gap: 12px; }

.finish-summary { margin-top: 16px; }
.summary-item { display: flex; justify-content: space-between; padding: 8px 0; border-bottom: 1px solid var(--gray-100); }

/* ===== Result Page ===== */
.result-section { padding: 40px 0; }
.result-summary { display: flex; align-items: center; gap: 40px; background: var(--white); border-radius: var(--radius-lg); padding: 48px; margin-bottom: 32px; box-shadow: var(--shadow-lg); }
.result-summary.passed { border-left: 6px solid var(--success); }
.result-summary.failed { border-left: 6px solid var(--danger); }

.result-score-circle { flex-shrink: 0; position: relative; }
.result-score-circle svg { width: 150px; height: 150px; }
.score-text { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); text-align: center; }
.score-value { font-size: 36px; font-weight: 800; display: block; }
.score-unit { font-size: 14px; color: var(--gray-500); }

.result-info h1 { font-size: 28px; color: var(--dark); margin-bottom: 8px; }
.result-info h2 { font-size: 20px; color: var(--gray-700); margin-bottom: 12px; font-weight: 500; }
.result-status { display: inline-block; padding: 6px 16px; border-radius: 20px; font-size: 14px; font-weight: 700; }
.result-status.passed { background: #e6f4ea; color: var(--success); }
.result-status.failed { background: #fce8e6; color: var(--danger); }
.result-category { font-size: 14px; color: var(--gray-500); margin-top: 8px; }

.result-stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 32px; }
.result-stat { display: flex; align-items: center; gap: 12px; background: var(--white); padding: 20px; border-radius: var(--radius); box-shadow: var(--shadow); }
.result-stat i { font-size: 24px; }
.result-stat.correct i { color: var(--success); }
.result-stat.wrong i { color: var(--danger); }
.result-stat.empty i { color: var(--gray-400); }
.result-stat.time i { color: var(--primary); }
.result-stat strong { font-size: 24px; display: block; color: var(--dark); }
.result-stat span { font-size: 12px; color: var(--gray-500); }

.result-actions { display: flex; gap: 12px; margin-bottom: 48px; justify-content: center; }

/* Solutions */
.solutions-section h2 { font-size: 24px; margin-bottom: 24px; display: flex; align-items: center; gap: 10px; }
.solution-card { background: var(--white); border-radius: var(--radius); margin-bottom: 16px; box-shadow: var(--shadow); overflow: hidden; }
.solution-card.correct { border-left: 4px solid var(--success); }
.solution-card.wrong { border-left: 4px solid var(--danger); }
.solution-card.empty-answer { border-left: 4px solid var(--gray-400); }
.solution-header { display: flex; justify-content: space-between; padding: 16px 20px; background: var(--gray-50); }
.solution-number { font-weight: 700; }
.solution-status { font-size: 14px; font-weight: 600; }
.solution-card.correct .solution-status { color: var(--success); }
.solution-card.wrong .solution-status { color: var(--danger); }
.solution-question { padding: 20px; font-size: 15px; line-height: 1.7; }
.solution-options { padding: 0 20px 20px; display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.solution-option { padding: 10px 14px; border-radius: var(--radius-sm); border: 1px solid var(--gray-200); display: flex; align-items: center; gap: 10px; font-size: 14px; }
.solution-option.correct-answer { background: #e6f4ea; border-color: var(--success); }
.solution-option.wrong-answer { background: #fce8e6; border-color: var(--danger); }
.solution-option .option-letter { width: 28px; height: 28px; border-radius: 50%; background: var(--gray-200); display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 12px; flex-shrink: 0; }
.solution-option.correct-answer .option-letter { background: var(--success); color: var(--white); }
.solution-option.wrong-answer .option-letter { background: var(--danger); color: var(--white); }

.solution-explanation { padding: 20px; background: #fffef0; border-top: 1px solid var(--gray-200); }
.solution-explanation h4 { font-size: 14px; color: var(--secondary-dark); margin-bottom: 8px; display: flex; align-items: center; gap: 8px; }
.solution-text { font-size: 14px; line-height: 1.7; color: var(--gray-700); }
.solution-image { margin-top: 12px; }
.solution-image img { max-width: 100%; max-height: 400px; border-radius: 8px; border: 1px solid var(--gray-200); }

/* ===== Leaderboard ===== */
.leaderboard-section { padding: 40px 0; }
.top-three { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-bottom: 40px; }
.top-card { background: var(--white); border-radius: var(--radius-lg); padding: 32px; text-align: center; box-shadow: var(--shadow-md); position: relative; transition: var(--transition); }
.top-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.top-card.rank-1 { border-top: 4px solid #FFD700; }
.top-card.rank-2 { border-top: 4px solid #C0C0C0; }
.top-card.rank-3 { border-top: 4px solid #CD7F32; }
.top-rank { width: 32px; height: 32px; border-radius: 50%; background: var(--primary); color: var(--white); display: flex; align-items: center; justify-content: center; font-weight: 800; position: absolute; top: -16px; left: 50%; transform: translateX(-50%); }
.top-avatar { width: 64px; height: 64px; border-radius: 50%; background: linear-gradient(135deg, var(--primary), var(--secondary)); display: flex; align-items: center; justify-content: center; color: var(--white); font-size: 20px; font-weight: 700; margin: 16px auto 12px; }
.top-stats { display: flex; flex-direction: column; gap: 4px; font-size: 13px; color: var(--gray-600); margin-top: 12px; }
.top-medal { font-size: 24px; margin-top: 12px; }
.gold { color: #FFD700; }
.silver { color: #C0C0C0; }
.bronze { color: #CD7F32; }

.leaderboard-table table { width: 100%; border-collapse: collapse; background: var(--white); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.leaderboard-table th, .leaderboard-table td { padding: 14px 20px; text-align: left; border-bottom: 1px solid var(--gray-200); }
.leaderboard-table th { background: var(--gray-50); font-size: 13px; color: var(--gray-600); font-weight: 600; text-transform: uppercase; }
.leaderboard-table tr.current-user { background: var(--primary-light); }
.rank-badge { width: 28px; height: 28px; border-radius: 50%; display: inline-flex; align-items: center; justify-content: center; font-weight: 700; font-size: 13px; color: var(--white); }
.rank-badge.rank-1 { background: #FFD700; }
.rank-badge.rank-2 { background: #C0C0C0; }
.rank-badge.rank-3 { background: #CD7F32; }
.user-info { display: flex; align-items: center; gap: 10px; }
.avg-score { font-weight: 600; color: var(--primary); }

/* ===== Badges Page ===== */
.badges-section { padding: 40px 0; }
.badges-summary { background: var(--white); border-radius: var(--radius); padding: 24px; margin-bottom: 32px; box-shadow: var(--shadow); }
.badges-count { font-size: 16px; margin-bottom: 12px; }
.badges-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 20px; }
.badge-card { background: var(--white); border-radius: var(--radius); padding: 24px; text-align: center; box-shadow: var(--shadow); transition: var(--transition); }
.badge-card.locked { opacity: 0.5; }
.badge-card.earned:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.badge-icon-large { width: 64px; height: 64px; border-radius: 50%; display: flex; align-items: center; justify-content: center; color: var(--white); font-size: 28px; margin: 0 auto 12px; }
.badge-card h3 { font-size: 16px; margin-bottom: 6px; }
.badge-card p { font-size: 13px; color: var(--gray-600); margin-bottom: 12px; }
.badge-locked { font-size: 12px; color: var(--gray-500); }
.badge-earned { font-size: 12px; color: var(--success); font-weight: 600; }

/* ===== Results Table ===== */
.results-table table, .admin-table { width: 100%; border-collapse: collapse; }
.results-table th, .results-table td, .admin-table th, .admin-table td { padding: 12px 16px; text-align: left; border-bottom: 1px solid var(--gray-200); font-size: 14px; }
.results-table th, .admin-table th { background: var(--gray-50); font-size: 12px; color: var(--gray-600); font-weight: 600; text-transform: uppercase; }
.results-table tr:hover, .admin-table tr:hover { background: var(--gray-50); }
.admin-table tr.drag-over { border-top: 2px solid var(--primary); background: rgba(37,99,235,0.05); }
.drag-handle:hover { color: var(--gray-700) !important; }
.drag-handle:active { cursor: grabbing !important; }

.score-badge { display: inline-block; padding: 3px 10px; border-radius: 12px; font-weight: 700; font-size: 13px; }
.score-badge.passed { background: #e6f4ea; color: var(--success); }
.score-badge.failed { background: #fce8e6; color: var(--danger); }

.status-badge { display: inline-flex; align-items: center; gap: 4px; padding: 3px 10px; border-radius: 12px; font-size: 12px; font-weight: 600; }
.status-badge.success { background: #e6f4ea; color: var(--success); }
.status-badge.danger { background: #fce8e6; color: var(--danger); }
.status-badge.warning { background: #fef7e0; color: #e37400; }

.badge { display: inline-block; padding: 2px 10px; background: var(--gray-100); border-radius: 12px; font-size: 12px; color: var(--gray-700); }
.answer-badge { display: inline-flex; width: 28px; height: 28px; align-items: center; justify-content: center; border-radius: 50%; background: var(--primary); color: var(--white); font-weight: 700; font-size: 13px; }

.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-muted { color: var(--gray-500); }
.text-center { text-align: center; }
.mt-4 { margin-top: 24px; }
.mb-4 { margin-bottom: 24px; }

/* ===== Pagination ===== */
.pagination { display: flex; gap: 6px; justify-content: center; align-items: center; margin-top: 24px; flex-wrap: wrap; }
.page-btn { min-width: 38px; height: 38px; display: flex; align-items: center; justify-content: center; border-radius: var(--radius-sm); font-size: 14px; font-weight: 500; color: var(--gray-700); border: 1px solid var(--gray-300); transition: var(--transition); padding: 0 4px; }
.page-btn:hover:not(.disabled):not(.page-dots) { background: var(--primary); color: var(--white); border-color: var(--primary); }
.page-btn.active { background: var(--primary); color: var(--white); border-color: var(--primary); font-weight: 700; }
.page-btn.page-dots { border: none; cursor: default; font-weight: 700; letter-spacing: 2px; color: var(--gray-500); min-width: 28px; }
.page-btn.page-arrow { font-size: 12px; }
.page-btn.disabled { opacity: 0.4; cursor: default; pointer-events: none; }

/* ===== Profile ===== */
.profile-section { padding: 40px 0; }
.profile-card { max-width: 700px; margin: 0 auto; background: var(--white); border-radius: var(--radius); padding: 40px; box-shadow: var(--shadow); }
.profile-form hr { border: none; border-top: 1px solid var(--gray-200); margin: 24px 0; }
.profile-form h3 { font-size: 16px; color: var(--gray-700); margin-bottom: 16px; }

/* ===== Footer ===== */
.main-footer { background: var(--dark); color: rgba(255,255,255,0.8); padding: 60px 0 0; margin-top: 80px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; padding-bottom: 40px; }
.footer-logo { display: flex; align-items: center; gap: 10px; font-size: 20px; font-weight: 700; color: var(--white); margin-bottom: 16px; }
.footer-col h4 { color: var(--white); font-size: 16px; margin-bottom: 16px; }
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 8px; }
.footer-col a { color: rgba(255,255,255,0.7); font-size: 14px; }
.footer-col a:hover { color: var(--white); }
.footer-col p { font-size: 14px; margin-bottom: 8px; }
.social-links { display: flex; gap: 12px; margin-top: 12px; }
.social-links a { width: 36px; height: 36px; border-radius: 50%; background: rgba(255,255,255,0.1); display: flex; align-items: center; justify-content: center; color: var(--white); font-size: 16px; }
.social-links a:hover { background: var(--primary); }
.footer-secure-payment { background: rgba(255,255,255,0.05); border-radius: 12px; padding: 30px; margin-bottom: 30px; text-align: center; }
.footer-secure-payment h4 { color: var(--white); font-size: 20px; font-weight: 700; margin-bottom: 10px; }
.footer-secure-payment > p { color: rgba(255,255,255,0.7); font-size: 14px; margin-bottom: 20px; max-width: 600px; margin-left: auto; margin-right: auto; }
.payment-icons { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; }
.payment-icon { background: var(--white); border-radius: 8px; padding: 10px 20px; display: flex; align-items: center; justify-content: center; min-width: 100px; min-height: 45px; gap: 6px; }
.pi-visa { color: #1a1f71; font-weight: 800; font-size: 20px; font-style: italic; letter-spacing: -1px; }
.pi-mc { display: flex; align-items: center; gap: 4px; color: #333; font-size: 13px; font-weight: 600; }
.pi-troy { color: #333; font-weight: 700; font-size: 16px; }
.pi-amex { background: #2e77bc; color: white; font-size: 9px; font-weight: 700; text-align: center; line-height: 1.2; padding: 6px 10px; border-radius: 4px; letter-spacing: 1px; }
.pi-secure span, .pi-ssl span { font-size: 13px; font-weight: 600; color: #333; line-height: 1.2; }
.pi-secure small, .pi-ssl small { font-size: 10px; font-weight: 400; color: #666; text-transform: uppercase; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding: 20px 0; text-align: center; font-size: 13px; }

/* ===== ADMIN PANEL ===== */
.admin-body { background: var(--gray-100); }
.admin-layout { display: flex; min-height: 100vh; }

.admin-sidebar {
    width: 260px; background: var(--dark); color: var(--white);
    position: fixed; left: 0; top: 0; bottom: 0; z-index: 100;
    display: flex; flex-direction: column; transition: var(--transition);
}
.admin-sidebar.collapsed { width: 0; overflow: hidden; }

.sidebar-header { padding: 20px; border-bottom: 1px solid rgba(255,255,255,0.1); flex-shrink: 0; }
.sidebar-logo { display: flex; align-items: center; gap: 10px; color: var(--white); font-weight: 700; font-size: 18px; }
.sidebar-logo i { font-size: 24px; color: var(--secondary); }

.sidebar-nav { flex: 1; min-height: 0; overflow-y: auto; overflow-x: hidden; }
.sidebar-nav ul { list-style: none; padding: 12px 0; }
.sidebar-nav a { display: flex; align-items: center; gap: 12px; padding: 10px 20px; color: rgba(255,255,255,0.7); font-size: 14px; transition: var(--transition); }
.sidebar-nav a:hover, .sidebar-nav a.active { background: rgba(255,255,255,0.1); color: var(--white); }
.sidebar-nav a.active { border-right: 3px solid var(--secondary); }
.sidebar-nav a i { width: 20px; text-align: center; }
.nav-section { padding: 16px 20px 6px; font-size: 11px; color: rgba(255,255,255,0.4); text-transform: uppercase; font-weight: 700; letter-spacing: 1px; }
.sidebar-nav::-webkit-scrollbar { width: 4px; }
.sidebar-nav::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.2); border-radius: 2px; }

.sidebar-footer-item { margin-top: 8px; padding-top: 12px; border-top: 1px solid rgba(255,255,255,0.1); }
.sidebar-footer-item a { color: rgba(255,255,255,0.5) !important; font-size: 13px !important; }

.admin-main { flex: 1; margin-left: 260px; transition: var(--transition); }
.admin-main.expanded { margin-left: 0; }

.admin-topbar { background: var(--white); padding: 12px 24px; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--gray-200); position: sticky; top: 0; z-index: 50; }
.sidebar-toggle { background: none; border: none; font-size: 20px; cursor: pointer; color: var(--gray-700); }
.admin-topbar-right { display: flex; align-items: center; gap: 16px; }
.admin-name { font-size: 14px; color: var(--gray-600); display: flex; align-items: center; gap: 6px; }

.admin-content { padding: 24px; }
.admin-alert { margin: 0 24px 0; max-width: none; }

.admin-page-title { font-size: 24px; color: var(--dark); margin-bottom: 24px; display: flex; align-items: center; gap: 10px; }
.admin-page-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px; }
.admin-page-header .admin-page-title { margin-bottom: 0; }

.admin-stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-bottom: 32px; }
.admin-stat-card { background: var(--white); border-radius: var(--radius); padding: 24px; display: flex; align-items: center; gap: 16px; box-shadow: var(--shadow); }
.admin-stat-card.blue { border-left: 4px solid var(--primary); }
.admin-stat-card.green { border-left: 4px solid var(--success); }
.admin-stat-card.orange { border-left: 4px solid var(--secondary); }
.admin-stat-card.purple { border-left: 4px solid #7c4dff; }
.admin-stat-icon { width: 48px; height: 48px; border-radius: 12px; display: flex; align-items: center; justify-content: center; font-size: 22px; color: var(--white); }
.admin-stat-card.blue .admin-stat-icon { background: var(--primary); }
.admin-stat-card.green .admin-stat-icon { background: var(--success); }
.admin-stat-card.orange .admin-stat-icon { background: var(--secondary); }
.admin-stat-card.purple .admin-stat-icon { background: #7c4dff; }
.admin-stat-info h3 { font-size: 28px; font-weight: 800; color: var(--dark); }
.admin-stat-info p { font-size: 13px; color: var(--gray-600); }

.admin-grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }

.admin-card { background: var(--white); border-radius: var(--radius); box-shadow: var(--shadow); }
.admin-card-header { display: flex; justify-content: space-between; align-items: center; padding: 16px 20px; border-bottom: 1px solid var(--gray-200); }
.admin-card-header h3 { font-size: 16px; font-weight: 700; display: flex; align-items: center; gap: 8px; }
.admin-card-body { padding: 20px; }

.admin-info-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.info-item { text-align: center; padding: 16px; background: var(--gray-50); border-radius: var(--radius-sm); }
.info-item span { font-size: 13px; color: var(--gray-600); display: block; margin-bottom: 4px; }
.info-item strong { font-size: 24px; color: var(--dark); }

/* Admin search */
.search-form { display: flex; gap: 8px; }
.search-form input { flex: 1; }

.filter-form { display: flex; gap: 12px; align-items: center; }
.filter-form select { width: auto; }
.filter-info { font-size: 13px; color: var(--gray-600); }

/* Lang tabs */
.lang-tabs { display: flex; gap: 4px; margin-bottom: 20px; border-bottom: 2px solid var(--gray-200); }
.lang-tab { padding: 10px 20px; background: none; border: none; font-size: 14px; font-weight: 500; cursor: pointer; color: var(--gray-600); border-bottom: 2px solid transparent; margin-bottom: -2px; transition: var(--transition); }
.lang-tab.active { color: var(--primary); border-bottom-color: var(--primary); }
.lang-tab-content { display: none; }
.lang-tab-content.active { display: block; }

/* Question list item (exam edit) */
.question-list-item { display: flex; align-items: center; gap: 12px; padding: 8px 12px; border-bottom: 1px solid var(--gray-100); font-size: 14px; }
.q-num { font-weight: 700; color: var(--primary); min-width: 40px; }
.q-text { flex: 1; color: var(--gray-700); }
.q-answer { font-weight: 700; width: 28px; height: 28px; display: flex; align-items: center; justify-content: center; background: var(--primary-light); border-radius: 50%; color: var(--primary); font-size: 13px; }

.add-question-form { display: flex; gap: 8px; margin-top: 12px; }
.add-question-form select { flex: 1; }

/* ===== Import ===== */
.import-info { margin-bottom: 24px; }
.info-box { padding: 16px 20px; background: var(--primary-light); border-radius: var(--radius-sm); border-left: 4px solid var(--primary); }
.info-box h4 { color: var(--primary); margin-bottom: 8px; }
.info-box ul { list-style: none; }
.info-box li { padding: 3px 0; font-size: 14px; }
.info-box li::before { content: "•"; color: var(--primary); margin-right: 8px; }

.file-upload-area { border: 2px dashed var(--gray-300); border-radius: var(--radius); padding: 40px; text-align: center; cursor: pointer; transition: var(--transition); position: relative; }
.file-upload-area:hover, .file-upload-area.dragover { border-color: var(--primary); background: var(--primary-light); }
.file-upload-area.file-selected { border-color: #22c55e; background: #f0fdf4; border-style: solid; }
.file-upload-area.file-selected i.fa-cloud-upload-alt { color: #22c55e; }
.file-upload-area i { font-size: 48px; color: var(--gray-400); display: block; margin-bottom: 12px; }
.file-upload-area input[type="file"] { position: absolute; inset: 0; opacity: 0; cursor: pointer; z-index: 2; }
.file-name { font-size: 15px; color: #16a34a; font-weight: 700; margin-top: 12px; display: none; position: relative; z-index: 1; padding: 8px 16px; background: #dcfce7; border-radius: 6px; }
.file-name.visible { display: inline-block; }

.language-checkboxes { display: flex; gap: 12px; flex-wrap: wrap; }
.checkbox-card { cursor: pointer; }
.checkbox-card input { display: none; }
.checkbox-card-content { padding: 12px 20px; border: 2px solid var(--gray-300); border-radius: var(--radius-sm); display: flex; align-items: center; gap: 8px; transition: var(--transition); }
.checkbox-card input:checked + .checkbox-card-content { border-color: var(--primary); background: var(--primary-light); }

.import-progress { margin-top: 32px; padding: 24px; background: var(--gray-50); border-radius: var(--radius); }
.import-progress h3 { margin-bottom: 16px; }
.import-log { margin-top: 16px; font-size: 14px; }
.import-log p { padding: 4px 0; }

.import-result { margin-top: 16px; padding: 16px 20px; border-radius: var(--radius-sm); font-weight: 600; }
.import-result.success { background: #e6f4ea; color: var(--success); }
.import-result.error { background: #fce8e6; color: var(--danger); }

/* Email */
.template-variables { margin-bottom: 20px; padding: 12px 16px; background: var(--gray-50); border-radius: var(--radius-sm); }
.template-variables h4 { font-size: 13px; margin-bottom: 6px; }
.template-variables code { background: var(--primary-light); padding: 2px 8px; border-radius: 4px; font-size: 13px; color: var(--primary); margin-right: 4px; }

.code-editor { font-family: 'Consolas', 'Monaco', monospace; font-size: 13px; line-height: 1.5; }

.email-logs-list { max-height: 400px; overflow-y: auto; }
.email-log-item { display: flex; align-items: center; gap: 8px; padding: 8px 0; border-bottom: 1px solid var(--gray-100); font-size: 13px; }
.log-email { flex: 1; font-weight: 500; }
.log-subject { color: var(--gray-500); flex: 1; }
.log-date { color: var(--gray-400); font-size: 12px; }

.tips-list { list-style: none; }
.tips-list li { padding: 6px 0; font-size: 14px; display: flex; align-items: center; gap: 8px; }
.tips-list i { color: var(--success); }

.form-actions { display: flex; gap: 12px; }

/* Admin Login */
.admin-login-body { background: linear-gradient(135deg, var(--dark), var(--dark-2)); min-height: 100vh; display: flex; align-items: center; justify-content: center; }
.admin-login-container { width: 100%; max-width: 420px; padding: 20px; }
.admin-login-card { background: var(--white); border-radius: var(--radius-lg); padding: 48px 40px; box-shadow: var(--shadow-lg); }
.admin-login-header { text-align: center; margin-bottom: 32px; }
.admin-login-header i { font-size: 48px; color: var(--primary); }
.admin-login-header h2 { font-size: 24px; margin-top: 12px; }
.admin-login-header p { color: var(--gray-500); font-size: 14px; }

.question-preview { max-width: 300px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 13px; color: var(--gray-700); }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .hero-content { grid-template-columns: 1fr; }
    .hero-image { display: none; }
    .feature-row, .feature-row.reverse { grid-template-columns: 1fr; gap: 32px; direction: ltr; }
    .feature-row-img img { height: 250px; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .dashboard-grid { grid-template-columns: 1fr; }
    .admin-grid-2 { grid-template-columns: 1fr; }
    .result-stats-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .mobile-menu-toggle { display: block; }
    .main-nav { position: fixed; top: 70px; left: 0; right: 0; background: var(--white); display: none; border-top: 1px solid var(--gray-200); box-shadow: var(--shadow-lg); z-index: 99; }
    .main-nav.open { display: block; }
    .main-nav ul { flex-direction: column; padding: 16px; }
    .nav-link { padding: 12px 16px; }

    .hero-section { padding: 60px 0 40px; min-height: auto; }
    .hero-section h1 { font-size: 32px; }
    .hero-trust { justify-content: center; }
    .stats-section { margin-top: -30px; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .stat-card:not(:last-child)::after { display: none; }
    .photo-banner { height: 220px; }
    .banner-text h2 { font-size: 24px; }
    .cta-content h2 { font-size: 28px; }
    .cta-section { padding: 60px 0; }
    .feature-row, .feature-row.reverse { grid-template-columns: 1fr; direction: ltr; }
    .feature-row-img img { height: 200px; }
    .dashboard-stats { grid-template-columns: repeat(2, 1fr); }
    .admin-stats-grid { grid-template-columns: repeat(2, 1fr); }
    .features-grid { grid-template-columns: 1fr; }
    .exams-grid { grid-template-columns: 1fr; }
    .top-three { grid-template-columns: 1fr; }

    .auth-container { grid-template-columns: 1fr; }
    .auth-side { display: none; }
    .form-row-2, .form-row-3 { grid-template-columns: 1fr; }

    .exam-layout { grid-template-columns: 1fr; }
    .exam-nav-panel { display: none; }
    .exam-question-area { padding: 20px; }

    .result-summary { flex-direction: column; text-align: center; }
    .solution-options { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }

    .admin-sidebar { width: 0; overflow: hidden; }
    .admin-main { margin-left: 0; }
    .admin-sidebar.open { width: 260px; }
}

@media (max-width: 480px) {
    .hero-section h1 { font-size: 26px; }
    .hero-buttons { flex-direction: column; }
    .stats-grid { grid-template-columns: 1fr; }
    .dashboard-stats { grid-template-columns: 1fr; }
    .admin-stats-grid { grid-template-columns: 1fr; }
    .exam-info-grid { grid-template-columns: 1fr; }
    .result-stats-grid { grid-template-columns: 1fr; }
}

/* ===== Payment System ===== */
.exam-price-badge {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 6px 14px; border-radius: 20px; font-size: 14px; font-weight: 700;
    background: linear-gradient(135deg, #fbbf24, #f59e0b); color: #78350f;
    margin: 8px 0;
}
.exam-price-badge.purchased {
    background: linear-gradient(135deg, #34d399, #10b981); color: #064e3b;
}
.payment-section { padding: 40px 0; }
.payment-card {
    background: var(--white); border-radius: 16px; padding: 32px;
    box-shadow: 0 4px 24px rgba(0,0,0,.08); max-width: 550px; margin: 0 auto;
}
.payment-exam-info { text-align: center; margin-bottom: 24px; }
.payment-exam-info h2 { margin: 8px 0 4px; font-size: 20px; color: var(--dark); }
.payment-exam-info p { color: var(--text-light); font-size: 14px; }
.payment-amount-box {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: var(--white); padding: 24px; border-radius: 12px; text-align: center; margin-bottom: 24px;
}
.payment-amount-label { font-size: 13px; opacity: .8; }
.payment-amount { font-size: 36px; font-weight: 800; }
.payment-try-info { font-size: 12px; opacity: .8; margin-top: 4px; }
.payment-form .form-group { margin-bottom: 16px; }
.payment-form label { display: block; font-size: 13px; font-weight: 600; color: var(--dark); margin-bottom: 4px; }
.payment-form input, .payment-form select {
    width: 100%; padding: 10px 14px; border: 1px solid #d1d5db; border-radius: 8px;
    font-size: 15px; transition: border-color .2s;
}
.payment-form input:focus, .payment-form select:focus { border-color: var(--primary); outline: none; box-shadow: 0 0 0 3px rgba(26,115,232,.12); }
.payment-secure-text { text-align: center; margin-top: 12px; font-size: 12px; color: var(--text-light); }