/* =============================================================================
   DESIGN SYSTEM - TOKENS & BASE
   ========================================================================== */

:root {
    /* Couleurs (Mode Clair par défaut) */
    --clr-primary-h: 240;
    --clr-primary-s: 80%;
    --clr-primary-l: 50%;
    --clr-primary: hsl(var(--clr-primary-h), var(--clr-primary-s), var(--clr-primary-l));
    
    --clr-text-h: 240;
    --clr-text-s: 10%;
    --clr-text-l: 10%;
    --clr-text: hsl(var(--clr-text-h), var(--clr-text-s), var(--clr-text-l));
    
    --clr-bg-h: 240;
    --clr-bg-s: 20%;
    --clr-bg-l: 98%;
    --clr-bg: hsl(var(--clr-bg-h), var(--clr-bg-s), var(--clr-bg-l));
    
    --clr-surface-h: 0;
    --clr-surface-s: 0%;
    --clr-surface-l: 100%;
    --clr-surface: hsl(var(--clr-surface-h), var(--clr-surface-s), var(--clr-surface-l));
    
    --clr-border-h: 240;
    --clr-border-s: 10%;
    --clr-border-l: 85%;
    --clr-border: hsl(var(--clr-border-h), var(--clr-border-s), var(--clr-border-l));

    --clr-success: hsl(120, 60%, 40%);
    --clr-error: hsl(0, 80%, 50%);

    /* Géométrie */
    --radius-card: 16px;
    --radius-chip: 8px;
    --radius-button: 6px;
    --spacing-unit: 8px;

    /* Typographie */
    --font-family-base: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
    --font-family-mono: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, Courier, monospace;
    --font-size-base: 1rem;
    --font-scale-h1: 2.5rem;
    --font-scale-h2: 2rem;
    --font-scale-h3: 1.5rem;
    --font-scale-small: 0.875rem;

    /* Ombres */
    --shadow-soft: 0 4px 12px hsla(var(--clr-text-h), var(--clr-text-s), 10%, 0.1);
    --shadow-card: 0 8px 24px hsla(var(--clr-text-h), var(--clr-text-s), 10%, 0.15);
}

/* Mode Sombre */
body.dark-mode {
    --clr-primary-l: 70%;
    --clr-text-l: 90%;
    --clr-bg-l: 10%;
    --clr-surface-h: 240;
    --clr-surface-s: 10%;
    --clr-surface-l: 15%;
    --clr-border-l: 25%;
    --shadow-soft: 0 4px 12px hsla(var(--clr-text-h), var(--clr-text-s), 10%, 0.3);
    --shadow-card: 0 8px 24px hsla(var(--clr-text-h), var(--clr-text-s), 10%, 0.4);
}

/* =============================================================================
   BASE & RESET
   ========================================================================== */

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

html {
    font-size: 16px;
    line-height: 1.5;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    color: var(--clr-text);
    background-color: var(--clr-bg);
    transition: background-color 0.3s, color 0.3s;
    min-height: 100vh;
}

/* Accessibilité: Focus visible */
:focus-visible {
    outline: 3px solid var(--clr-primary);
    outline-offset: 2px;
    border-radius: var(--radius-button);
}

/* Accessibilité: Réduction de mouvement */
@media (prefers-reduced-motion: reduce) {
    * {
        transition: none !important;
        animation: none !important;
    }
}

/* =============================================================================
   GRILLE & MISE EN PAGE
   ========================================================================== */

.container {
    width: min(100% - 4rem, 1280px);
    margin-inline: auto;
    padding-block: calc(4 * var(--spacing-unit));
}

.grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: calc(3 * var(--spacing-unit));
}

.col-span-12 { grid-column: span 12; }
.col-span-8 { grid-column: span 8; }
.col-span-6 { grid-column: span 6; }
.col-span-4 { grid-column: span 4; }
.col-span-3 { grid-column: span 3; }

@media (max-width: 1024px) {
    .col-lg-8 { grid-column: span 8; }
    .col-lg-4 { grid-column: span 4; }
    .col-lg-6 { grid-column: span 6; }
}

@media (max-width: 768px) {
    .col-md-12 { grid-column: span 12; }
    .col-md-6 { grid-column: span 6; }
    .col-md-4 { grid-column: span 4; }
    .container { padding-block: calc(2 * var(--spacing-unit)); }
}

/* =============================================================================
   TYPOGRAPHIE & ÉLÉMENTS DE CONTENU
   ========================================================================== */

h1, h2, h3 {
    line-height: 1.2;
    margin-bottom: calc(2 * var(--spacing-unit));
    font-weight: 700;
}

h1 { font-size: var(--font-scale-h1); }
h2 { font-size: var(--font-scale-h2); }
h3 { font-size: var(--font-scale-h3); }

p {
    margin-bottom: var(--spacing-unit);
}

a {
    color: var(--clr-primary);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: hsl(var(--clr-primary-h), var(--clr-primary-s), calc(var(--clr-primary-l) - 10%));
    text-decoration: underline;
}

/* Pour les chiffres dans les tableaux/cartes */
.tabular-nums {
    font-variant-numeric: tabular-nums;
}

/* =============================================================================
   COMPOSANTS UI
   ========================================================================== */

/* --- Boutons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: calc(1.5 * var(--spacing-unit)) calc(3 * var(--spacing-unit));
    border: 1px solid transparent;
    border-radius: var(--radius-button);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s, border-color 0.2s, box-shadow 0.2s;
    text-decoration: none;
}

.btn-primary {
    background-color: var(--clr-primary);
    color: var(--clr-surface);
}

.btn-primary:hover {
    background-color: hsl(var(--clr-primary-h), var(--clr-primary-s), calc(var(--clr-primary-l) - 10%));
    text-decoration: none;
}

.btn-secondary {
    background-color: transparent;
    color: var(--clr-primary);
    border-color: var(--clr-primary);
}

.btn-secondary:hover {
    background-color: hsl(var(--clr-primary-h), var(--clr-primary-s), 90%);
}

.dark-mode .btn-secondary:hover {
    background-color: hsl(var(--clr-primary-h), var(--clr-primary-s), 20%);
}

/* --- Cards --- */
.card {
    background-color: var(--clr-surface);
    border-radius: var(--radius-card);
    box-shadow: var(--shadow-card);
    padding: calc(4 * var(--spacing-unit));
    border: 1px solid var(--clr-border);
    transition: box-shadow 0.3s, border-color 0.3s;
}

/* --- Chips/Tags --- */
.chip {
    display: inline-flex;
    align-items: center;
    padding: calc(0.5 * var(--spacing-unit)) calc(1.5 * var(--spacing-unit));
    border-radius: var(--radius-chip);
    font-size: var(--font-scale-small);
    font-weight: 500;
    background-color: hsl(var(--clr-primary-h), 10%, 90%);
    color: var(--clr-text);
    cursor: default;
    margin-right: var(--spacing-unit);
    margin-bottom: var(--spacing-unit);
}

.dark-mode .chip {
    background-color: hsl(var(--clr-primary-h), 10%, 20%);
}

.chip.removable {
    cursor: pointer;
}

.chip.removable:hover {
    opacity: 0.8;
}

/* --- Tabs --- */
.tabs-nav {
    display: flex;
    border-bottom: 1px solid var(--clr-border);
    margin-bottom: calc(4 * var(--spacing-unit));
}

.tab-button {
    padding: calc(2 * var(--spacing-unit)) calc(3 * var(--spacing-unit));
    border: none;
    background: none;
    color: var(--clr-text);
    cursor: pointer;
    font-weight: 500;
    border-bottom: 3px solid transparent;
    transition: border-color 0.2s, color 0.2s;
}

.tab-button:hover {
    color: var(--clr-primary);
}

.tab-button.active {
    border-bottom-color: var(--clr-primary);
    font-weight: 700;
    color: var(--clr-primary);
}

.tab-content {
    padding-top: calc(2 * var(--spacing-unit));
}

/* --- Modals --- */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
}

.modal-overlay.visible {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background-color: var(--clr-surface);
    border-radius: var(--radius-card);
    box-shadow: var(--shadow-card);
    max-width: 90%;
    max-height: 90%;
    overflow-y: auto;
    padding: calc(6 * var(--spacing-unit));
    position: relative;
    transform: translateY(-20px);
    transition: transform 0.3s;
}

.modal-overlay.visible .modal-content {
    transform: translateY(0);
}

.modal-close {
    position: absolute;
    top: calc(2 * var(--spacing-unit));
    right: calc(2 * var(--spacing-unit));
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--clr-text);
    opacity: 0.7;
}

/* --- Formulaires --- */
input[type="text"], input[type="number"], select {
    padding: calc(1.5 * var(--spacing-unit));
    border: 1px solid var(--clr-border);
    border-radius: var(--radius-button);
    background-color: var(--clr-surface);
    color: var(--clr-text);
    width: 100%;
    transition: border-color 0.2s;
}

input[type="text"]:focus, input[type="number"]:focus, select:focus {
    border-color: var(--clr-primary);
    outline: none;
}

/* =============================================================================
   STYLES SPÉCIFIQUES À LA PAGE
   ========================================================================== */

/* --- Hero Section --- */
.hero {
    padding-block: 100px;
    background: var(--clr-bg);
    position: relative;
    overflow: hidden;
}

.hero-content {
    position: relative;
    z-index: 10;
}

.hero-title {
    font-size: 4rem;
    font-weight: 900;
    margin-bottom: var(--spacing-unit);
}

.hero-baseline {
    font-size: 1.5rem;
    font-weight: 300;
    margin-bottom: calc(4 * var(--spacing-unit));
}

/* --- Dino Card Grid --- */
.dino-card-grid {
    /* Utilise la grille 12 colonnes par défaut, mais définit les spans pour les cartes */
    grid-template-columns: repeat(12, 1fr);
}

.dino-card-grid > div {
    /* Assure que les divs enfants (qui contiennent les cartes) respectent les spans définis dans app.js */
    /* col-span-4 (desktop), col-lg-6 (large), col-md-12 (mobile) */
    grid-column: span 4;
}

@media (max-width: 1024px) {
    .dino-card-grid > div {
        grid-column: span 6;
    }
}

@media (max-width: 768px) {
    .dino-card-grid > div {
        grid-column: span 12;
    }
}

/* --- Timeline --- */
.timeline-section {
    padding-block: calc(8 * var(--spacing-unit));
    overflow-x: auto;
}

.timeline-container {
    height: 150px;
    position: relative;
    margin-bottom: calc(4 * var(--spacing-unit));
}

.timeline-period {
    position: absolute;
    top: 0;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    opacity: 0.8;
    transition: width 0.5s, left 0.5s;
}

.timeline-period span {
    padding: var(--spacing-unit);
    background: rgba(0, 0, 0, 0.2);
    border-radius: var(--radius-chip);
}

.timeline-dino-marker {
    position: absolute;
    bottom: 0;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: var(--clr-primary);
    transform: translateX(-50%);
    cursor: pointer;
    transition: left 0.5s;
}

.timeline-dino-marker:hover {
    box-shadow: 0 0 0 5px hsla(var(--clr-primary-h), var(--clr-primary-s), var(--clr-primary-l), 0.5);
}

/* --- Charts --- */
.chart-container {
    padding: calc(4 * var(--spacing-unit));
    border: 1px solid var(--clr-border);
    border-radius: var(--radius-card);
    margin-bottom: calc(4 * var(--spacing-unit));
}

.chart-svg {
    width: 100%;
    height: 400px;
}

/* --- Documentation & Tests --- */
.doc-content h1, .doc-content h2, .doc-content h3 {
    border-bottom: 1px solid var(--clr-border);
    padding-bottom: calc(0.5 * var(--spacing-unit));
    margin-top: calc(4 * var(--spacing-unit));
}

.doc-content table {
    width: 100%;
    border-collapse: collapse;
    margin: calc(2 * var(--spacing-unit)) 0;
}

.doc-content th, .doc-content td {
    border: 1px solid var(--clr-border);
    padding: calc(1.5 * var(--spacing-unit));
    text-align: left;
}

.doc-content th {
    background-color: hsl(var(--clr-bg-h), var(--clr-bg-s), calc(var(--clr-bg-l) - 5%));
}

.doc-content code, .doc-content pre {
    font-family: var(--font-family-mono);
    background-color: hsl(var(--clr-bg-h), var(--clr-bg-s), calc(var(--clr-bg-l) - 5%));
    padding: 2px 4px;
    border-radius: 4px;
}

.dark-mode .doc-content th {
    background-color: hsl(var(--clr-bg-h), var(--clr-bg-s), calc(var(--clr-bg-l) + 5%));
}

.dark-mode .doc-content code, .dark-mode .doc-content pre {
    background-color: hsl(var(--clr-bg-h), var(--clr-bg-s), calc(var(--clr-bg-l) + 5%));
}

.test-result-success {
    color: var(--clr-success);
    font-weight: 600;
}

.test-result-failure {
    color: var(--clr-error);
    font-weight: 600;
}

/* --- Footer --- */
footer {
    border-top: 1px solid var(--clr-border);
    padding-top: calc(4 * var(--spacing-unit));
    margin-top: calc(8 * var(--spacing-unit));
    font-size: var(--font-scale-small);
    text-align: center;
    color: hsl(var(--clr-text-h), var(--clr-text-s), 50%);
}

/* --- SVG Hero Background (Low-poly/Mesh subtle effect) --- */
.hero-svg-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.1;
    z-index: 1;
}

/* --- Tooltip --- */
.tooltip {
    position: absolute;
    background-color: var(--clr-text);
    color: var(--clr-surface);
    padding: calc(1.5 * var(--spacing-unit));
    border-radius: var(--radius-button);
    font-size: var(--font-scale-small);
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s;
    z-index: 100;
    white-space: nowrap;
}

.tooltip.visible {
    opacity: 1;
}