/* ============================================================================
   OBSERVATOIRE DU MARCHÉ DE L'INTERNET EN ALGÉRIE — DESIGN SYSTEM
   Aesthetic : dark editorial / data journalism premium
   ============================================================================ */

/* ---------- DESIGN TOKENS ---------- */
:root {
  /* Palette — inspirée du désert algérien la nuit */
  --ink-900: #0a0e1a;          /* fond profond */
  --ink-800: #111729;
  --ink-700: #1a2238;
  --ink-600: #232e4a;
  --ink-500: #354265;

  --gold-500: #d4a437;          /* or désertique */
  --gold-400: #e0b958;
  --gold-300: #ecd28a;
  --gold-100: #f7ecc7;

  --emerald-500: #2d8a5f;       /* vert oasis */
  --emerald-400: #45a877;
  --emerald-300: #6cc298;

  --crimson-500: #b85042;       /* terre cuite */
  --crimson-400: #d16b5d;

  --cream-100: #f4ede0;
  --cream-200: #e8dec8;
  --slate-300: #94a3b8;
  --slate-400: #64748b;

  /* Typographie */
  --font-display: 'Fraunces', Georgia, 'Times New Roman', serif;
  --font-body: 'Manrope', -apple-system, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;

  /* Espacements (échelle modulaire) */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
  --space-9: 6rem;
  --space-10: 8rem;

  /* Rayons */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 32px;

  /* Ombres */
  --shadow-glow-gold: 0 0 60px -10px rgba(212, 164, 55, 0.4);
  --shadow-glow-emerald: 0 0 60px -10px rgba(45, 138, 95, 0.35);
  --shadow-card: 0 20px 60px -20px rgba(0, 0, 0, 0.5),
                 inset 0 1px 0 rgba(255, 255, 255, 0.05);
  --shadow-lift: 0 30px 80px -30px rgba(0, 0, 0, 0.6);

  /* Transitions */
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
}

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

html {
  scroll-behavior: smooth;
  scrollbar-color: var(--gold-500) var(--ink-800);
  scrollbar-width: thin;
}

html::-webkit-scrollbar { width: 8px; }
html::-webkit-scrollbar-track { background: var(--ink-800); }
html::-webkit-scrollbar-thumb { background: var(--gold-500); border-radius: 4px; }

body {
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.6;
  color: var(--cream-100);
  background: var(--ink-900);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Texture de fond — bruit + aurore subtile */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse at top right, rgba(212, 164, 55, 0.08), transparent 50%),
    radial-gradient(ellipse at bottom left, rgba(45, 138, 95, 0.06), transparent 50%),
    radial-gradient(ellipse at center, rgba(26, 34, 56, 0.4), transparent 70%);
  z-index: -2;
  pointer-events: none;
}

body::after {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='200' height='200'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.04 0'/></filter><rect width='200' height='200' filter='url(%23n)'/></svg>");
  opacity: 0.5;
  z-index: -1;
  pointer-events: none;
  mix-blend-mode: overlay;
}

img, svg, canvas { display: block; max-width: 100%; }

/* ---------- TYPOGRAPHIE ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--cream-100);
}

.display-1 {
  font-size: clamp(2.5rem, 7vw, 6rem);
  font-weight: 400;
  font-style: italic;
  font-variation-settings: "opsz" 144, "SOFT" 50;
}

.display-2 {
  font-size: clamp(2rem, 5vw, 4rem);
  font-weight: 400;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--gold-400);
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
}

.eyebrow::before {
  content: '';
  width: 24px;
  height: 1px;
  background: var(--gold-500);
}

.lead {
  font-size: clamp(1.05rem, 1.4vw, 1.25rem);
  color: var(--slate-300);
  max-width: 65ch;
  line-height: 1.7;
}

/* ---------- LAYOUT GLOBAL ---------- */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 clamp(1rem, 4vw, 2.5rem);
}

.section {
  padding: clamp(4rem, 10vw, 8rem) 0;
  position: relative;
}

.section-divider {
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--ink-500), transparent);
  margin: 0 auto;
  max-width: 1280px;
}

/* ---------- NAV ---------- */
.topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: var(--space-4) 0;
  background: rgba(10, 14, 26, 0.6);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  transition: padding 0.3s var(--ease-out-expo);
}

.topbar.compact { padding: var(--space-3) 0; }

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.1rem;
  color: var(--cream-100);
  text-decoration: none;
}

.brand-mark {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--gold-500), var(--crimson-500));
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--ink-900);
  font-style: normal;
}

.section-nav {
  display: flex;
  gap: var(--space-1);
  list-style: none;
}

.section-nav a {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--slate-300);
  text-decoration: none;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  transition: all 0.2s var(--ease-out-expo);
}

.section-nav a:hover, .section-nav a.active {
  color: var(--gold-300);
  background: rgba(212, 164, 55, 0.08);
}

@media (max-width: 900px) {
  .section-nav { display: none; }
}

.topbar-actions {
  display: flex;
  gap: var(--space-2);
}

/* ---------- BOUTONS ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.65rem 1.2rem;
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  border: 1px solid transparent;
  cursor: pointer;
  background: transparent;
  color: var(--cream-100);
  transition: all 0.25s var(--ease-out-expo);
  text-decoration: none;
}

.btn-ghost {
  border-color: rgba(255, 255, 255, 0.12);
  color: var(--cream-100);
}
.btn-ghost:hover {
  border-color: var(--gold-500);
  color: var(--gold-300);
  background: rgba(212, 164, 55, 0.05);
}

.btn-gold {
  background: linear-gradient(135deg, var(--gold-500), var(--gold-400));
  color: var(--ink-900);
  border-color: var(--gold-500);
  font-weight: 700;
}
.btn-gold:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow-gold);
}

.btn-icon {
  width: 18px; height: 18px;
}

/* ---------- HERO ---------- */
.hero {
  min-height: 100vh;
  padding-top: clamp(6rem, 12vh, 9rem);
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: var(--space-7);
  align-items: center;
  position: relative;
  overflow: hidden;
}

@media (max-width: 1024px) {
  .hero {
    grid-template-columns: 1fr;
    text-align: left;
  }
}

.hero-content { position: relative; z-index: 2; }

.hero h1 {
  margin-top: var(--space-5);
  margin-bottom: var(--space-5);
}

.hero h1 .gold {
  background: linear-gradient(135deg, var(--gold-400), var(--gold-300));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-style: italic;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-top: var(--space-6);
  padding-top: var(--space-5);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.hero-meta-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.hero-meta-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--slate-400);
}

.hero-meta-value {
  font-family: var(--font-display);
  font-size: 1.1rem;
  color: var(--cream-100);
}

.hero-3d {
  position: relative;
  aspect-ratio: 1 / 1;
  width: 100%;
  max-width: 600px;
  margin-left: auto;
}

#scene3d {
  width: 100%;
  height: 100%;
  border-radius: var(--radius-xl);
  position: relative;
}

.scene-hint {
  position: absolute;
  bottom: var(--space-4);
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--slate-400);
  pointer-events: none;
  opacity: 0.6;
  z-index: 5;
}

/* ---------- KPI CARDS ---------- */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-4);
  margin-top: var(--space-7);
}

.kpi {
  position: relative;
  background: linear-gradient(180deg, rgba(35, 46, 74, 0.4), rgba(17, 23, 41, 0.6));
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  overflow: hidden;
  transition: all 0.4s var(--ease-out-expo);
}

.kpi::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--gold-500), transparent);
  opacity: 0;
  transition: opacity 0.3s;
}

.kpi:hover {
  border-color: rgba(212, 164, 55, 0.3);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lift);
}

.kpi:hover::before { opacity: 1; }

.kpi-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--slate-300);
  margin-bottom: var(--space-3);
}

.kpi-value {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 400;
  color: var(--gold-300);
  line-height: 1;
  letter-spacing: -0.02em;
}

.kpi-value .unit {
  font-size: 0.5em;
  color: var(--slate-300);
  margin-left: var(--space-2);
  font-style: italic;
}

.kpi-trend {
  margin-top: var(--space-3);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--emerald-400);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.kpi-trend.down { color: var(--crimson-400); }

/* ---------- SECTION HEADER ---------- */
.section-head {
  max-width: 800px;
  margin-bottom: var(--space-7);
}

.section-head h2 {
  margin: var(--space-3) 0;
}

/* ---------- DATA BLOCS ---------- */
.data-block {
  background: linear-gradient(180deg, rgba(26, 34, 56, 0.5), rgba(17, 23, 41, 0.7));
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-xl);
  padding: clamp(1.5rem, 3vw, 2.5rem);
  position: relative;
  overflow: hidden;
}

.data-block-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-5);
  flex-wrap: wrap;
  gap: var(--space-3);
}

.data-block-title h3 {
  font-size: clamp(1.25rem, 2.5vw, 1.75rem);
}

.chart-container {
  position: relative;
  height: 320px;
  width: 100%;
}

.chart-container.tall { height: 400px; }

.split-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-5);
}

/* ---------- TABLEAU ---------- */
.table-wrap {
  margin-top: var(--space-5);
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.06);
}

table.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

table.data-table thead {
  background: rgba(212, 164, 55, 0.08);
}

table.data-table th {
  text-align: left;
  padding: var(--space-3) var(--space-4);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--gold-300);
  font-weight: 500;
  border-bottom: 1px solid rgba(212, 164, 55, 0.2);
}

table.data-table td {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  color: var(--cream-100);
}

table.data-table tbody tr {
  transition: background 0.2s;
}

table.data-table tbody tr:hover {
  background: rgba(212, 164, 55, 0.04);
}

table.data-table td.num {
  font-family: var(--font-mono);
  text-align: right;
  color: var(--gold-300);
}

/* ---------- FOOTER ---------- */
.site-footer {
  padding: var(--space-7) 0 var(--space-6);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  margin-top: var(--space-9);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-6);
  margin-bottom: var(--space-6);
}

@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr; }
}

.footer-title {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--gold-400);
  margin-bottom: var(--space-3);
}

.footer-text {
  color: var(--slate-300);
  font-size: 0.9rem;
  line-height: 1.7;
}

.footer-bottom {
  padding-top: var(--space-5);
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--slate-400);
}

/* ---------- SYNTHESE CARDS ---------- */
.synthese-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-5);
}

.synthese-card {
  position: relative;
  padding: var(--space-6);
  background: linear-gradient(180deg, rgba(35, 46, 74, 0.5), rgba(17, 23, 41, 0.8));
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: all 0.4s var(--ease-out-expo);
}

.synthese-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 4px; height: 100%;
  background: var(--accent, var(--gold-500));
}

.synthese-card:nth-child(1) { --accent: var(--gold-500); }
.synthese-card:nth-child(2) { --accent: var(--emerald-500); }
.synthese-card:nth-child(3) { --accent: var(--crimson-500); }

.synthese-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lift);
  border-color: rgba(255, 255, 255, 0.12);
}

.synthese-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  margin-bottom: var(--space-4);
  color: var(--cream-100);
}

.synthese-figure {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 400;
  color: var(--accent, var(--gold-500));
  line-height: 1;
  margin-bottom: var(--space-2);
}

.synthese-context {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--slate-300);
  margin-bottom: var(--space-4);
}

.synthese-desc {
  color: var(--slate-300);
  font-size: 0.95rem;
  line-height: 1.65;
}

/* ---------- ANIMATIONS ---------- */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(40px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes shimmer {
  0%   { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

@keyframes pulse {
  0%, 100% { opacity: 0.6; }
  50%      { opacity: 1; }
}

.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s var(--ease-out-expo),
              transform 0.8s var(--ease-out-expo);
}

.reveal.in {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- LOADER ---------- */
#loader {
  position: fixed;
  inset: 0;
  background: var(--ink-900);
  z-index: 1000;
  display: grid;
  place-items: center;
  transition: opacity 0.6s var(--ease-out-expo), visibility 0.6s;
}

#loader.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loader-content {
  text-align: center;
}

.loader-mark {
  width: 64px;
  height: 64px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--gold-500), var(--crimson-500));
  margin: 0 auto var(--space-4);
  animation: pulse 1.5s ease-in-out infinite;
  position: relative;
}

.loader-mark::after {
  content: 'ARPCE';
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--ink-900);
}

.loader-text {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--slate-300);
  margin-top: var(--space-3);
}

.loader-bar {
  width: 200px;
  height: 2px;
  background: var(--ink-700);
  margin: var(--space-4) auto 0;
  border-radius: 2px;
  overflow: hidden;
  position: relative;
}

.loader-bar::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, var(--gold-500), transparent);
  background-size: 200% 100%;
  animation: shimmer 1.5s linear infinite;
}

/* ---------- FAB FAB FAB ---------- */
.fab-stack {
  position: fixed;
  right: var(--space-5);
  bottom: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  z-index: 50;
}

.fab {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--ink-700);
  border: 1px solid rgba(212, 164, 55, 0.3);
  color: var(--gold-300);
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: all 0.25s var(--ease-out-expo);
  backdrop-filter: blur(10px);
}

.fab:hover {
  background: var(--gold-500);
  color: var(--ink-900);
  transform: scale(1.1);
  box-shadow: var(--shadow-glow-gold);
}

.fab svg { width: 20px; height: 20px; }

/* ---------- TOAST ---------- */
.toast {
  position: fixed;
  bottom: var(--space-5);
  left: 50%;
  transform: translate(-50%, 100px);
  background: var(--emerald-500);
  color: white;
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  box-shadow: var(--shadow-lift);
  z-index: 200;
  transition: transform 0.4s var(--ease-out-expo);
}

.toast.show {
  transform: translate(-50%, 0);
}

/* ---------- RESPONSIVE FINES ---------- */
@media (max-width: 640px) {
  .topbar-inner { gap: var(--space-2); }
  .brand { font-size: 0.95rem; }
  .brand-mark { width: 30px; height: 30px; font-size: 0.7rem; }
  .btn { padding: 0.5rem 0.9rem; font-size: 0.7rem; }
  .hero { padding-top: 7rem; }
  .data-block { padding: var(--space-4); }
  .chart-container { height: 280px; }
  .fab-stack { bottom: var(--space-3); right: var(--space-3); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  .reveal { opacity: 1; transform: none; }
}

/* ---------- LEGENDE INLINE ---------- */
.legend-inline {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-top: var(--space-4);
  font-size: 0.85rem;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.legend-swatch {
  width: 14px;
  height: 14px;
  border-radius: 3px;
}

/* ---------- ASCII art block ---------- */
.ascii-art {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--slate-400);
  white-space: pre;
  opacity: 0.5;
  margin: var(--space-5) 0;
  line-height: 1.2;
  overflow-x: auto;
}