/* =========================================================
   TOKENS
   ========================================================= */
:root {
    --color-primary: #6366f1;
    --color-accent: #f97316;
    --color-info: #06b6d4;
    --color-bg: #f8f9fa;
    --color-surface: #ffffff;
    --color-text: #333333;
    --color-text-soft: #666666;
    --color-text-muted: #555555;
    --color-border: #e0e7ff;
    --color-border-soft: #dddddd;
    --radius-sm: 10px;
    --radius-md: 12px;
    --radius-lg: 30px;
    --shadow-sm: 0 2px 8px rgba(99, 102, 241, 0.08);
    --shadow-md: 0 4px 15px rgba(99, 102, 241, 0.1);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.2);
    --shadow-xl: 0 15px 40px rgba(0, 0, 0, 0.3);
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
}

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

body {
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    background: var(--color-bg);
    min-height: 100vh;
    padding: 40px 20px;
    color: var(--color-text);
}

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

header {
    text-align: center;
    color: var(--color-primary);
    margin-bottom: 50px;
}

h1 {
    font-size: 3em;
    margin-bottom: 10px;
}

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

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

/* =========================================================
   TITRES ET TEXTES
   ========================================================= */
.page-subtitle {
    font-size: 1.2em;
    opacity: 0.75;
    color: var(--color-text-muted);
}

.text-emphasis-date {
    color: var(--color-accent);
    font-size: 1.1em;
    font-weight: 600;
}

.page-section-title {
    font-size: 2em;
    color: var(--color-primary);
    margin-top: 50px;
    margin-bottom: 30px;
    padding-bottom: 15px;
    border-bottom: 3px solid var(--color-primary);
}

/* =========================================================
   PANELS
   ========================================================= */
.panel {
    background: var(--color-surface);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    margin: 30px 0;
    padding: 30px;
    border-left: 4px solid var(--color-primary);
}

.panel h2 {
    color: var(--color-primary);
    font-size: 1.8em;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.panel p {
    font-size: 1.05em;
    line-height: 1.6;
    margin-bottom: 20px;
    color: var(--color-text-soft);
}

.panel ul {
    list-style: none;
    margin: 15px 0;
    padding: 0;
}

.panel li {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 12px 15px 12px 35px;
    margin-bottom: 10px;
    color: var(--color-text);
    position: relative;
    line-height: 1.5;
}

.panel li::before {
    content: "•";
    color: var(--color-primary);
    font-weight: 700;
    font-size: 1.2em;
    position: absolute;
    left: 15px;
    top: 12px;
}

.panel a {
    text-decoration: none;
    font-weight: 500;
}

.panel a:hover {
    text-decoration: underline;
}

.panel code {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    padding: 2px 6px;
    font-family: "Courier New", Courier, monospace;
    font-size: 0.9em;
    color: var(--color-primary);
}

.panel--theme {
    border-top: 4px solid var(--color-primary);
    border-left: 0;
    padding: 40px 30px;
}

.panel--theme > p:first-of-type {
    color: var(--color-text-soft);
}

.panel--theme ul {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.panel--theme li {
    display: flex;
    align-items: flex-start;
    gap: 15px;
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    box-shadow: var(--shadow-sm);
    padding: 20px;
}

.panel--theme li::before {
    content: "";
}

.panel--theme li:hover {
    border-color: var(--color-primary);
    background: #f5f3ff;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.15);
}

.panel--theme li i {
    color: var(--color-primary);
}

.panel--theme li strong {
    display: block;
    margin-bottom: 8px;
    font-size: 1.1em;
}

.panel--theme em {
    display: block;
    margin-top: 25px;
    padding-top: 20px;
    border-top: 2px solid var(--color-border-soft);
    color: var(--color-primary);
    font-weight: 600;
}

.panel--highlight {
    text-align: center;
    border-left-color: var(--color-accent);
}

.panel--links {
    text-align: center;
    border-left-color: var(--color-primary);
}

.panel--tips {
    border-left-color: var(--color-accent);
}

.panel--tips h2 {
    color: var(--color-accent);
}

.panel--resources {
    border-left-color: var(--color-info);
}

.panel--resources h2 {
    color: var(--color-info);
}

.panel--links ul {
    text-align: left;
    max-width: 700px;
    margin: 0 auto 30px;
}

.panel--links > ul > li {
    border-bottom: 1px solid var(--color-border-soft);
    border-radius: 0;
    background: none;
    padding: 0 0 15px;
    margin-bottom: 15px;
}

.panel--links > ul > li:last-child {
    border-bottom: 0;
}

.panel--links > ul > li::before {
    content: "";
}

.panel--links li ul {
    margin-top: 12px;
    margin-left: 20px;
}

.panel--links li li {
    border: 0;
    background: none;
    padding: 0;
    margin-bottom: 8px;
    color: var(--color-text-soft);
    font-size: 0.95em;
}

.panel--links li li::before {
    content: "";
}

/* =========================================================
   LISTES SPECIALISEES
   ========================================================= */
.definition-list {
    margin-top: 16px;
    text-align: left;
    border-left: 3px solid var(--color-border);
    padding-left: 16px;
}

.definition-list dt {
    font-weight: 700;
    color: var(--color-primary);
    margin-top: 14px;
    margin-bottom: 6px;
}

.definition-list dd {
    margin: 0 0 10px;
}

.definition-list ul {
    display: block;
    list-style: disc;
    margin: 0 0 0 20px;
    padding: 0;
}

.definition-list li {
    display: list-item;
    border: 0;
    background: none;
    box-shadow: none;
    padding: 2px 0;
    color: var(--color-text-soft);
}

.definition-list li::before {
    content: "";
}

.step-list {
    counter-reset: step;
    list-style: none;
    margin: 20px 0 0;
    padding: 0;
}

.step-list > li {
    position: relative;
    margin-bottom: 12px;
    padding: 14px 16px 14px 52px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-left: 4px solid var(--color-primary);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-sm);
    line-height: 1.55;
}

.step-list > li::before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    left: 14px;
    top: 13px;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--color-primary);
    color: var(--color-surface);
    font-size: 0.9em;
    font-weight: 700;
    display: grid;
    place-items: center;
}

.step-list > li > ul,
.step-list > ul {
    margin: 10px 0 0;
    padding-left: 18px;
    list-style: disc;
    color: var(--color-text-soft);
}

.step-list > li > ul li,
.step-list > ul li {
    margin: 6px 0;
}

.is-important {
    border-left-color: var(--color-accent) !important;
}

/* =========================================================
   CARTES ET GRILLES
   ========================================================= */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.card {
    background: var(--color-surface);
    color: var(--color-text);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 20px;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.card:hover {
    border-color: var(--color-primary);
    box-shadow: 0 8px 22px rgba(99, 102, 241, 0.18);
    transform: translateY(-4px);
}

.card h3 {
    margin: 0 0 10px;
    font-size: 1.2em;
}

.card p {
    margin: 0;
    color: var(--color-text-soft);
    line-height: 1.5;
}

/* =========================================================
   MEDIA CARDS (VIDEOS)
   ========================================================= */
.media-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
    margin-bottom: 50px;
}

.media-item {
    background: var(--color-surface);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.media-item:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.media-item__thumb {
    background: linear-gradient(135deg, #e0e7ff 0%, #f3f4f6 100%);
    width: 100%;
    height: 200px;
    border-top: 4px solid var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    cursor: pointer;
    transition: all var(--transition-base);
}

.media-item__thumb:hover {
    filter: brightness(1.1);
}

.media-item:nth-child(1) .media-item__thumb { border-top-color: var(--color-primary); }
.media-item:nth-child(2) .media-item__thumb { border-top-color: var(--color-accent); }
.media-item:nth-child(3) .media-item__thumb { border-top-color: var(--color-info); }
.media-item:nth-child(4) .media-item__thumb { border-top-color: var(--color-accent); }
.media-item:nth-child(5) .media-item__thumb { border-top-color: #a78bfa; }
.media-item:nth-child(6) .media-item__thumb { border-top-color: var(--color-info); }

.media-item__play {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: rgba(99, 102, 241, 0.2);
    color: var(--color-primary);
    font-size: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
    z-index: 2;
}

.media-item:hover .media-item__play {
    background: var(--color-primary);
    color: var(--color-surface);
    transform: scale(1.1);
}

.media-item__index {
    position: absolute;
    top: 15px;
    left: 15px;
    font-size: 4em;
    font-weight: 700;
    color: var(--color-primary);
}

.media-item__body {
    padding: 25px;
}

.media-item__title {
    font-size: 1.3em;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 10px;
}

.media-item__description {
    color: var(--color-text-soft);
    font-size: 0.95em;
    line-height: 1.5;
    margin-bottom: 15px;
}

/* =========================================================
   BOUTONS
   ========================================================= */
.btn {
    display: inline-block;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-base);
}

.btn-outline {
    background: var(--color-surface);
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
    border-radius: 25px;
    padding: 10px 22px;
    font-size: 1em;
    font-weight: 600;
}

.btn-outline:hover {
    background: var(--color-primary);
    color: var(--color-surface);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.2);
}

.btn-solid {
    background: var(--color-primary);
    color: var(--color-surface);
    border: none;
    border-radius: var(--radius-lg);
    padding: 14px 36px;
    font-size: 1.1em;
    font-weight: 700;
}

.btn-solid:hover {
    background: var(--color-accent);
    transform: translateY(-3px);
    box-shadow: 0 6px 16px rgba(99, 102, 241, 0.25);
}

/* =========================================================
   OVERLAY / DIALOG
   ========================================================= */
.overlay {
    display: none;
    position: fixed;
    z-index: 1000;
    inset: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    animation: fadeIn var(--transition-base);
}

.overlay__content {
    background-color: #fefefe;
    width: 90%;
    max-width: 900px;
    margin: 5% auto;
    padding: 0;
    border-radius: var(--radius-md);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: slideDown var(--transition-base);
}

.overlay__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    background: var(--color-surface);
    color: var(--color-primary);
    border-bottom: 3px solid var(--color-primary);
    border-radius: var(--radius-md) var(--radius-md) 0 0;
}

.overlay__header h2 {
    margin: 0;
    font-size: 1.5em;
}

.overlay__close {
    color: var(--color-primary);
    font-size: 28px;
    font-weight: 700;
    background: none;
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.overlay__close:hover,
.overlay__close:focus {
    color: var(--color-accent);
    transform: scale(1.3);
}

.overlay__frame {
    width: 100%;
    height: 600px;
    border: none;
    border-radius: 0 0 var(--radius-md) var(--radius-md);
}

/* =========================================================
   NAV TREE (INDEX)
   ========================================================= */
.nav-sidebar {
    display: grid;
    gap: 16px;
}

.nav-card {
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 18px;
    box-shadow: var(--shadow-sm);
}

.nav-card h3 {
    margin: 0 0 12px;
    font-size: 1.1em;
    color: var(--color-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-tree,
.nav-tree ul {
    list-style: none;
    margin: 0;
    padding-left: 0;
}

.nav-tree > li {
    margin-bottom: 12px;
}

.nav-tree li {
    color: var(--color-text);
    line-height: 1.45;
}

.nav-tree-label {
    display: inline-block;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 8px;
    font-size: 0.98em;
}

.nav-tree li ul {
    border-left: 2px solid var(--color-border);
    margin-left: 8px;
    padding-left: 12px;
}

.nav-tree > li > ul > li {
    margin: 6px 0;
    padding: 6px 8px;
    border-radius: 8px;
    background: #fafbff;
}

.nav-tree > li > ul > li > a,
.nav-tree > li > ul > li {
    font-weight: 600;
}

.nav-tree > li > ul > li > ul {
    margin-top: 6px;
    border-left-style: dashed;
}

.nav-tree > li > ul > li > ul > li {
    margin: 5px 0;
    color: var(--color-text-soft);
    font-size: 0.95em;
}

.nav-tree > li > ul > li > ul > li > ul {
    border-left-color: #d4dbff;
}

.nav-tree > li > ul > li > ul > li > ul > li {
    font-size: 0.92em;
}

.nav-tree a {
    color: var(--color-text);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.nav-tree a:hover {
    text-decoration: underline;
    color: var(--color-accent);
}

/* =========================================================
   PROMO CARDS (PORTES OUVERTES)
   ========================================================= */
.split-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-top: 30px;
}

.action-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-top: 25px;
}

.cta-card {
    display: block;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 15px;
    padding: 30px;
    text-decoration: none;
    color: #ffffff;
    transition: all var(--transition-base);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.cta-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.6);
}

.cta-card__icon {
    font-size: 2.5em;
    margin-bottom: 10px;
}

.cta-card h2 {
    font-size: 1.4em;
    margin-bottom: 10px;
    color: #ffffff;
}

.cta-card p {
    opacity: 0.9;
    color: #ffffff;
}

.cta-card--orange {
    background: linear-gradient(135deg, #f97316 0%, #ea580c 100%);
}

.cta-card--teal {
    background: linear-gradient(135deg, #06b6d4 0%, #0891b2 100%);
}

/* =========================================================
   QUIZ CARD
   ========================================================= */
.quiz-shell {
    max-width: 800px;
    margin: 0 auto;
}

.quiz-card {
    background: var(--color-surface);
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.quiz-card p {
    color: var(--color-text-soft);
    font-size: 16px;
    margin-bottom: 30px;
}

.quiz-button {
    background-color: #007bff;
    color: #ffffff;
    padding: 12px 30px;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    cursor: pointer;
    transition: background-color var(--transition-base);
}

.quiz-button:hover {
    background-color: #0056b3;
}

/* =========================================================
   FOOTER
   ========================================================= */
.site-footer,
footer {
    text-align: center;
    color: #999;
    margin-top: 50px;
    font-size: 0.9em;
}

/* =========================================================
   UTILITIES
   ========================================================= */
.u-text-left {
    text-align: left;
}

.u-muted {
    color: #555;
    line-height: 1.6;
    margin-bottom: 20px;
}

.u-muted-tight {
    color: #555;
    margin-bottom: 10px;
}

.u-list-basic {
    margin: 15px 0;
    padding-left: 25px;
    text-align: left;
}

.u-list-basic li {
    color: #555;
    margin-bottom: 8px;
}

/* =========================================================
   ANIMATIONS
   ========================================================= */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideDown {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* =========================================================
   RESPONSIVE
   ========================================================= */
@media (max-width: 900px) {
    .nav-layout {
        grid-template-columns: 1fr;
    }

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

@media (max-width: 768px) {
    body {
        padding: 20px 12px;
    }

    h1 {
        font-size: 2em;
    }

    .page-section-title {
        font-size: 1.5em;
    }

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

    .overlay__content {
        width: 95%;
        margin: 20% auto;
    }

    .overlay__frame {
        height: 300px;
    }

    .quiz-card {
        padding: 30px 20px;
    }
}