/* ============================================================
   Hero Section — Topographic Background
   ============================================================ */

/* --- Custom properties (light mode — white background) --- */
.zn-hero {
  --hero-bg: #fff;
  --hero-line: rgba(76, 175, 80, 0.12);
  --hero-accent: rgba(76, 175, 80, 0.35);
  --hero-text: #1a1a1a;
  --hero-text-muted: rgba(26, 26, 26, 0.75);
  --hero-accent-color: #e65100;
  --hero-btn-bg: rgba(0, 0, 0, 0.06);
  --hero-btn-bg-hover: rgba(0, 0, 0, 0.12);
  --hero-btn-primary-from: rgba(251, 146, 60, 0.95);
  --hero-btn-primary-to: rgba(234, 88, 12, 0.95);
  --hero-overlay-from: rgba(255, 255, 255, 0.2);
  --hero-overlay-to: rgba(255, 255, 255, 0.5);
}

/* --- Hero container --- */
.zn-hero {
  position: fixed;
  inset: 0;
  z-index: 1;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--hero-bg);
  color: var(--hero-text);
}

/* --- SVG Background layer --- */
.zn-hero__background {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0;
  transition: opacity 1.2s ease;
}

.zn-hero__background.zn-topo-loaded {
  opacity: 1;
}

.zn-hero__background .zn-topo {
  width: 100%;
  height: 100%;
  display: block;
}

/* --- Radial gradient overlay for depth --- */
.zn-hero__overlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(
    ellipse 80% 70% at 50% 45%,
    var(--hero-overlay-from),
    var(--hero-overlay-to)
  );
  z-index: 1;
}

/* ============================================================
   SVG Path Colors — 3 layers
   ============================================================ */

/* Background fill */
.topo-bg {
  fill: var(--hero-bg);
}

/* Subtle contour lines (54 paths) */
.topo-line {
  fill: var(--hero-line);
  opacity: 0;
  will-change: opacity;
}

/* Accent contour lines (9 paths) */
.topo-accent {
  fill: var(--hero-accent);
  opacity: 0;
  will-change: opacity;
}

/* ============================================================
   Staggered Fade-In Animations
   ============================================================ */

.zn-topo-loaded .topo-line {
  animation: topo-fade-in 1.8s ease forwards;
}

.zn-topo-loaded .topo-accent {
  animation:
    topo-fade-in 2s ease forwards,
    topo-glow 6s ease-in-out infinite;
}

/* Stagger subtle lines in 6 waves */
.zn-topo-loaded .topo-l-1,
.zn-topo-loaded .topo-l-2,
.zn-topo-loaded .topo-l-3,
.zn-topo-loaded .topo-l-4,
.zn-topo-loaded .topo-l-5,
.zn-topo-loaded .topo-l-6,
.zn-topo-loaded .topo-l-7,
.zn-topo-loaded .topo-l-8,
.zn-topo-loaded .topo-l-9 { animation-delay: 0.1s; }

.zn-topo-loaded .topo-l-10,
.zn-topo-loaded .topo-l-11,
.zn-topo-loaded .topo-l-12,
.zn-topo-loaded .topo-l-13,
.zn-topo-loaded .topo-l-14,
.zn-topo-loaded .topo-l-15,
.zn-topo-loaded .topo-l-16,
.zn-topo-loaded .topo-l-17,
.zn-topo-loaded .topo-l-18 { animation-delay: 0.5s; }

.zn-topo-loaded .topo-l-19,
.zn-topo-loaded .topo-l-20,
.zn-topo-loaded .topo-l-21,
.zn-topo-loaded .topo-l-22,
.zn-topo-loaded .topo-l-23,
.zn-topo-loaded .topo-l-24,
.zn-topo-loaded .topo-l-25,
.zn-topo-loaded .topo-l-26,
.zn-topo-loaded .topo-l-27 { animation-delay: 0.9s; }

.zn-topo-loaded .topo-l-28,
.zn-topo-loaded .topo-l-29,
.zn-topo-loaded .topo-l-30,
.zn-topo-loaded .topo-l-31,
.zn-topo-loaded .topo-l-32,
.zn-topo-loaded .topo-l-33,
.zn-topo-loaded .topo-l-34,
.zn-topo-loaded .topo-l-35,
.zn-topo-loaded .topo-l-36 { animation-delay: 1.3s; }

.zn-topo-loaded .topo-l-37,
.zn-topo-loaded .topo-l-38,
.zn-topo-loaded .topo-l-39,
.zn-topo-loaded .topo-l-40,
.zn-topo-loaded .topo-l-41,
.zn-topo-loaded .topo-l-42,
.zn-topo-loaded .topo-l-43,
.zn-topo-loaded .topo-l-44,
.zn-topo-loaded .topo-l-45 { animation-delay: 1.7s; }

.zn-topo-loaded .topo-l-46,
.zn-topo-loaded .topo-l-47,
.zn-topo-loaded .topo-l-48,
.zn-topo-loaded .topo-l-49,
.zn-topo-loaded .topo-l-50,
.zn-topo-loaded .topo-l-51,
.zn-topo-loaded .topo-l-52,
.zn-topo-loaded .topo-l-53,
.zn-topo-loaded .topo-l-54,
.zn-topo-loaded .topo-l-subtle { animation-delay: 2.1s; }

/* Stagger accent lines individually */
.zn-topo-loaded .topo-a-1 { animation-delay: 0.6s, 3.2s; }
.zn-topo-loaded .topo-a-2 { animation-delay: 0.9s, 3.5s; }
.zn-topo-loaded .topo-a-3 { animation-delay: 1.2s, 3.8s; }
.zn-topo-loaded .topo-a-4 { animation-delay: 1.5s, 4.1s; }
.zn-topo-loaded .topo-a-5 { animation-delay: 1.8s, 4.4s; }
.zn-topo-loaded .topo-a-6 { animation-delay: 2.1s, 4.7s; }
.zn-topo-loaded .topo-a-7 { animation-delay: 2.4s, 5.0s; }
.zn-topo-loaded .topo-a-8 { animation-delay: 2.7s, 5.3s; }
.zn-topo-loaded .topo-a-9 { animation-delay: 3.0s, 5.6s; }

/* ============================================================
   Keyframe Animations
   ============================================================ */

@keyframes topo-fade-in {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes topo-glow {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0.5; }
}

/* Slow background drift */
.zn-topo-loaded .zn-topo {
  animation: topo-drift 45s ease-in-out infinite;
}

@keyframes topo-drift {
  0%, 100% { transform: translate(0, 0) scale(1.05); }
  25%      { transform: translate(-8px, 4px) scale(1.05); }
  50%      { transform: translate(4px, -6px) scale(1.05); }
  75%      { transform: translate(6px, 2px) scale(1.05); }
}

/* ============================================================
   Hero Content
   ============================================================ */

.zn-hero__inner {
  position: relative;
  z-index: 2;
  padding: 4rem 1rem;
  text-align: center;
}

.zn-hero__content {
  max-width: 48rem;
  margin: 0 auto;
}

.zn-hero__title {
  font-size: clamp(1.8rem, 5vw, 3rem);
  font-weight: 700;
  line-height: 1.2;
  margin: 0 0 1.5rem;
  color: var(--hero-text);
}

.zn-hero__tagline {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  line-height: 1.6;
  margin: 0 0 2.5rem;
  color: var(--hero-text-muted);
}

.zn-hero__tagline strong {
  color: var(--hero-accent-color);
}

/* ============================================================
   CTA Buttons
   ============================================================ */

.zn-hero__actions {
  display: flex;
  gap: 1.25rem;
  justify-content: center;
  flex-wrap: wrap;
}

.zn-hero__actions .md-button {
  padding: 0.85em 2em;
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: 0.5rem;
  backdrop-filter: blur(12px);
  background-color: var(--hero-btn-bg);
  color: var(--hero-text);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.zn-hero__actions .md-button:hover {
  background-color: var(--hero-btn-bg-hover);
  color: var(--hero-text);
  border-color: rgba(0, 0, 0, 0.2);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
  transform: translateY(-1px);
}

.zn-hero__actions .md-button:focus-visible {
  outline: 2px solid var(--hero-accent-color);
  outline-offset: 2px;
}

.zn-hero__actions .md-button--primary {
  background: linear-gradient(135deg, var(--hero-btn-primary-from), var(--hero-btn-primary-to));
  border: 1px solid rgba(0, 0, 0, 0.1);
  color: #fff;
}

.zn-hero__actions .md-button--primary:hover {
  background: linear-gradient(135deg, rgba(251, 146, 60, 1), rgba(234, 88, 12, 1));
  color: #fff;
  box-shadow: 0 8px 32px rgba(234, 88, 12, 0.35);
}

/* ============================================================
   Dark Mode
   ============================================================ */

/* --- Dark mode — black background --- */
[data-md-color-scheme="slate"] .zn-hero {
  --hero-bg: #000;
  --hero-line: rgba(76, 175, 80, 0.08);
  --hero-accent: rgba(76, 175, 80, 0.25);
  --hero-text: #f1f5f9;
  --hero-text-muted: rgba(241, 245, 249, 0.85);
  --hero-accent-color: #FF8A65;
  --hero-btn-bg: rgba(255, 255, 255, 0.08);
  --hero-btn-bg-hover: rgba(255, 255, 255, 0.15);
  --hero-overlay-from: rgba(0, 0, 0, 0.2);
  --hero-overlay-to: rgba(0, 0, 0, 0.6);
}

/* ============================================================
   Transparent Header & Tabs on Hero Page
   ============================================================ */

body:has(.zn-hero) {
  overflow: hidden;
  height: 100vh;
}

body:has(.zn-hero) .md-header {
  position: relative;
  z-index: 2;
  backdrop-filter: none;
  box-shadow: none;
}

body:has(.zn-hero) .md-content,
body:has(.zn-hero) .md-sidebar--secondary {
  display: none;
}

/* Rendre le drawer mobile accessible malgré l'attribut hidden généré par le framework */
@media screen and (max-width: 76.234375em) {
  body:has(.zn-hero) .md-sidebar--primary[hidden] {
    display: block !important;
  }
}

/* ============================================================
   Responsive
   ============================================================ */

@media (max-width: 600px) {
  .zn-hero__inner {
    padding: 3rem 1rem;
  }

  .zn-hero__actions {
    flex-direction: column;
    align-items: center;
  }
}

/* ============================================================
   Reduced Motion
   ============================================================ */

@media (prefers-reduced-motion: reduce) {
  .zn-hero__background {
    opacity: 1;
    transition: none;
  }

  .topo-line,
  .topo-accent {
    opacity: 1;
    animation: none !important;
    will-change: auto;
  }

  .zn-topo-loaded .zn-topo {
    animation: none;
  }
}