/* Minimalist Academic Design System */
:root {
    /* Colors */
    --color-primary: #2C3E50;
    --color-secondary: #3498DB;
    --color-accent: #E74C3C;
    --color-success: #27AE60;
    --color-background: #FFFFFF;
    --color-light: #F8F9FA;
    --color-text: #2C3E50;
    --color-muted: #95A5A6;

    /* Typography */
    --font-serif: 'Crimson Text', serif;
    --font-sans: 'Work Sans', sans-serif;
    --font-mono: 'IBM Plex Mono', monospace;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-xxl: 4rem;

    /* Borders */
    --border-width: 1px;
    --border-color: #E1E8ED;
    --radius-sm: 4px;
    --radius-md: 8px;
}

/* Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Base */
body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-serif);
    font-weight: 400;
    line-height: 1.2;
    margin-bottom: var(--space-md);
}

h1 { font-size: clamp(2rem, 4vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 2.5vw, 1.75rem); }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: var(--space-md);
    color: var(--color-text);
}

/* Links */
a {
    color: var(--color-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--color-primary);
}

/* Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.container-small {
    max-width: 720px;
    margin: 0 auto;
    padding: 0 24px;
}

.grid-minimal {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 48px;
}

/* Spacing System */
.section {
    padding: 96px 0;
}

.section-compact {
    padding: 64px 0;
}

/* Buttons */
.btn-minimal {
    display: inline-block;
    padding: 12px 24px;
    background: var(--color-primary);
    color: white;
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-sm);
    font-weight: 500;
    font-size: 15px;
    transition: all 0.3s ease;
    cursor: pointer;
    text-align: center;
}

.btn-minimal:hover {
    background: transparent;
    color: var(--color-primary);
}

.btn-primary-minimal {
    display: inline-block;
    padding: 16px 32px;
    background: var(--color-primary);
    color: white;
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 16px;
    transition: all 0.3s ease;
    cursor: pointer;
}

.btn-primary-minimal:hover {
    background: transparent;
    color: var(--color-primary);
}

.btn-text {
    display: inline-block;
    color: var(--color-primary);
    font-weight: 500;
    transition: all 0.3s ease;
    padding: 8px 0;
}

.btn-text:hover {
    transform: translateX(4px);
}

.btn-text-minimal {
    display: inline-block;
    color: var(--color-secondary);
    font-weight: 400;
    transition: all 0.3s ease;
    padding: 16px 0;
    font-size: 16px;
}

.btn-text-minimal:hover {
    color: var(--color-primary);
    transform: translateX(4px);
}

/* Cards */
.card-minimal {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    position: relative;
    overflow: hidden;
}

.card-minimal::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-secondary), var(--color-accent));
    transform: translateX(-100%);
    transition: transform 0.4s ease;
}

.card-minimal:hover {
    border-color: var(--color-primary);
    box-shadow: 0 8px 32px rgba(0,0,0,0.12);
    transform: translateY(-4px);
}

.card-minimal:hover::before {
    transform: translateX(0);
}

/* Enhanced Test Card Styles */
.test-card {
    position: relative;
}

.test-card .card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 16px;
}

.test-badge {
    background: var(--color-light);
    color: var(--color-secondary);
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: all 0.3s ease;
}

.test-card:hover .test-badge {
    background: var(--color-secondary);
    color: white;
    transform: scale(1.05);
}

.premium-badge {
    background: linear-gradient(135deg, var(--color-accent), #ff6b6b);
    color: white;
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: 0 2px 8px rgba(231, 76, 60, 0.3);
    animation: pulse-premium 2s infinite;
}

.free-badge {
    background: linear-gradient(135deg, var(--color-success), #2ecc71);
    color: white;
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: 0 2px 8px rgba(39, 174, 96, 0.3);
}

@keyframes pulse-premium {
    0%, 100% { transform: scale(1); box-shadow: 0 2px 8px rgba(231, 76, 60, 0.3); }
    50% { transform: scale(1.05); box-shadow: 0 4px 12px rgba(231, 76, 60, 0.5); }
}

.card-stats-enhanced {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 24px;
    padding: 16px;
    background: rgba(248, 249, 250, 0.5);
    border-radius: 8px;
    border: 1px solid rgba(225, 232, 237, 0.5);
}

.stat-item-enhanced {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--color-text);
    font-weight: 500;
    transition: all 0.3s ease;
}

.stat-item-enhanced i {
    font-size: 16px;
    color: var(--color-secondary);
    transition: all 0.3s ease;
}

.test-card:hover .stat-item-enhanced i {
    color: var(--color-accent);
    transform: scale(1.1);
}

.card-actions-enhanced {
    display: flex;
    gap: 12px;
    margin-top: auto;
}

.btn-preview {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 16px;
    color: var(--color-primary);
    font-weight: 500;
    font-size: 14px;
    border: 1px solid var(--color-primary);
    border-radius: var(--radius-sm);
    transition: all 0.3s ease;
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.btn-preview:hover {
    background: var(--color-primary);
    color: white;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(44, 62, 80, 0.3);
}

.btn-start {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 12px 20px;
    background: linear-gradient(135deg, var(--color-secondary), #3498db);
    color: white;
    font-weight: 600;
    font-size: 14px;
    border: none;
    border-radius: var(--radius-sm);
    transition: all 0.3s ease;
    text-decoration: none;
    flex: 1;
    text-align: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.btn-start::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s ease;
}

.btn-start:hover {
    background: linear-gradient(135deg, #2980b9, var(--color-secondary));
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(52, 152, 219, 0.4);
}

.btn-start:hover::before {
    left: 100%;
}

.card-difficulty {
    position: absolute;
    top: 16px;
    right: 16px;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.difficulty-debutant {
    background: #e8f5e8;
    color: #27ae60;
}

.difficulty-intermediaire {
    background: #fff3cd;
    color: #f39c12;
}

.difficulty-avance {
    background: #f8d7da;
    color: #e74c3c;
}

/* Forms */
.form-minimal {
    max-width: 600px;
    margin: 0 auto;
}

.form-field {
    margin-bottom: var(--space-lg);
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
}

.form-field label {
    display: block;
    margin-bottom: var(--space-xs);
    font-weight: 500;
    color: var(--color-text);
    font-size: 14px;
}

.form-field input,
.form-field select,
.form-field textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 15px;
    transition: all 0.3s ease;
    background: white;
}

.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
    outline: none;
    border-color: var(--color-secondary);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.form-consent {
    margin: var(--space-lg) 0;
}

.checkbox-minimal {
    display: flex;
    align-items: flex-start;
    gap: var(--space-xs);
    margin-bottom: var(--space-sm);
    cursor: pointer;
    font-size: 14px;
    line-height: 1.5;
}

.checkbox-minimal input[type="checkbox"] {
    width: auto;
    margin: 0;
}

.form-submit {
    text-align: center;
    margin-top: var(--space-xl);
}

.btn-submit-minimal {
    background: var(--color-primary);
    color: white;
    border: 2px solid var(--color-primary);
    padding: 16px 32px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
}

.btn-submit-minimal:hover {
    background: transparent;
    color: var(--color-primary);
}

/* Header */
.minimal-header {
    background: white;
    border-bottom: 1px solid var(--border-color);
    padding: var(--space-md) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.nav-minimal {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo-minimal {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-weight: 600;
    font-size: 20px;
    color: var(--color-primary);
}

.logo-icon {
    font-size: 24px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--space-xl);
}

.nav-item {
    color: var(--color-text);
    font-weight: 400;
    transition: color 0.3s ease;
    font-size: 15px;
}

.nav-item:hover {
    color: var(--color-secondary);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-primary);
    transition: all 0.3s ease;
}

/* Hero Section */
.hero-minimal {
    padding: 120px 0 96px;
    text-align: center;
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 300;
    margin-bottom: var(--space-lg);
    line-height: 1.1;
}

.hero-subtitle {
    font-size: clamp(1.125rem, 2vw, 1.25rem);
    color: var(--color-muted);
    margin-bottom: var(--space-xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: var(--space-lg);
    margin-bottom: var(--space-xxl);
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--space-xxl);
    flex-wrap: wrap;
}

.stat-minimal {
    text-align: center;
}

.stat-number {
    display: block;
    font-family: var(--font-mono);
    font-size: 2rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--space-xs);
}

.stat-label {
    font-size: 14px;
    color: var(--color-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Subject Cards */
.subject-card-minimal {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: all 0.3s ease;
}

.subject-card-minimal:hover {
    border-color: var(--color-secondary);
    box-shadow: 0 8px 24px rgba(0,0,0,0.08);
    transform: translateY(-2px);
}

.card-link {
    display: block;
    padding: var(--space-xl);
    color: inherit;
}

.card-icon {
    font-size: 2.5rem;
    color: var(--color-secondary);
    margin-bottom: var(--space-md);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
    color: var(--color-primary);
}

.card-description {
    color: var(--color-muted);
    margin-bottom: var(--space-lg);
    font-size: 14px;
}

.card-stats {
    display: flex;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.stat {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 12px;
    color: var(--color-muted);
}

.card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-level {
    font-size: 12px;
    color: var(--color-secondary);
    font-weight: 500;
}

.card-arrow {
    font-size: 18px;
    color: var(--color-secondary);
    transition: transform 0.3s ease;
}

.subject-card-minimal:hover .card-arrow {
    transform: translateX(4px);
}

/* Section Headers */
.section-header-minimal {
    text-align: center;
    margin-bottom: var(--space-xxl);
}

.section-title {
    font-size: clamp(2rem, 3vw, 2.5rem);
    font-weight: 400;
    margin-bottom: var(--space-md);
    color: var(--color-primary);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--color-muted);
    max-width: 600px;
    margin: 0 auto;
}

/* Contact Section */
.contact-minimal {
    padding: var(--space-xxl) 0;
    background: var(--color-light);
}

.contact-info-minimal {
    margin-top: var(--space-xxl);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-lg);
}

.info-card {
    background: white;
    padding: var(--space-lg);
    border-radius: var(--radius-md);
    text-align: center;
    border: 1px solid var(--border-color);
}

.info-card i {
    font-size: 2rem;
    color: var(--color-secondary);
    margin-bottom: var(--space-md);
}

.info-card h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
    color: var(--color-primary);
}

.info-card p {
    font-size: 14px;
    color: var(--color-muted);
    margin-bottom: var(--space-xs);
}

/* Footer */
.minimal-footer {
    background: var(--color-light);
    border-top: 1px solid var(--border-color);
    padding: var(--space-xxl) 0 var(--space-lg);
    margin-top: var(--space-xxl);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
}

.footer-brand {
    max-width: 400px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-weight: 600;
    font-size: 20px;
    color: var(--color-primary);
    margin-bottom: var(--space-md);
}

.footer-description {
    color: var(--color-muted);
    margin-bottom: var(--space-lg);
    font-size: 14px;
}

.footer-stats {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 12px;
    color: var(--color-muted);
}

.footer-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: var(--space-md);
    color: var(--color-primary);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--space-sm);
}

.footer-links a {
    color: var(--color-text);
    font-size: 14px;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: var(--color-secondary);
}

.footer-contact .contact-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-xs);
    margin-bottom: var(--space-sm);
    font-size: 14px;
}

.footer-newsletter {
    background: white;
    padding: var(--space-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-xl);
    border: 1px solid var(--border-color);
}

.newsletter-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-lg);
}

.newsletter-text h4 {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    margin-bottom: var(--space-xs);
    color: var(--color-primary);
}

.newsletter-form {
    display: flex;
    gap: var(--space-sm);
    min-width: 300px;
}

.newsletter-form input {
    flex: 1;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 14px;
}

.newsletter-form button {
    padding: 12px 24px;
    background: var(--color-secondary);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-weight: 500;
    cursor: pointer;
    transition: background 0.3s ease;
}

.newsletter-form button:hover {
    background: var(--color-primary);
}

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding-top: var(--space-lg);
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    gap: var(--space-lg);
}

.company-info {
    font-size: 12px;
    color: var(--color-muted);
}

.legal-nav {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 12px;
}

.legal-nav a {
    color: var(--color-muted);
    transition: color 0.3s ease;
}

.legal-nav a:hover {
    color: var(--color-secondary);
}

.separator {
    color: var(--color-muted);
}

.copyright {
    text-align: right;
    font-size: 12px;
    color: var(--color-muted);
}

.trust-badges {
    display: flex;
    justify-content: center;
    gap: var(--space-lg);
    margin-top: var(--space-md);
    grid-column: 1 / -1;
}

.badge-item {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 11px;
    color: var(--color-muted);
}

/* Utilities */
.text-center { text-align: center; }
.text-muted { color: var(--color-muted); }
.text-accent { color: var(--color-accent); }

/* Responsive Design */
@media (max-width: 1024px) {
    .footer-content {
        grid-template-columns: 1fr 1fr;
        gap: var(--space-lg);
    }

    .newsletter-wrapper {
        flex-direction: column;
        align-items: stretch;
    }

    .newsletter-form {
        min-width: auto;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .nav-toggle {
        display: flex;
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

    .hero-stats {
        gap: var(--space-lg);
    }

    .form-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-bottom {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--space-md);
    }

    .copyright {
        text-align: center;
    }

    .trust-badges {
        flex-wrap: wrap;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .container,
    .container-small {
        padding: 0 16px;
    }

    .section {
        padding: 64px 0;
    }

    .hero-minimal {
        padding: 80px 0 64px;
    }

    .grid-minimal {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }
}