/*
 * index.css — homepage-only composition.
 * Loaded after global.css, nav.css, style.css, utils.css.
 *
 * Composition follows BRAND_BRIEF §9:
 *   1. HERO  (full-bleed dark photographic, layered gradient, hero CTA pill)
 *   2. CAPABILITIES (white tile, three typography-led columns)
 *   3. THIRD DEVICE (dark tile, three small glass sub-cards)
 *   4. SPECIFICATIONS (parchment tile, exploded product photo + metric columns)
 *   5. BUILD CTA (white tile, side-by-side product photo + CTAs)
 */

/* ─── Section system (shared across all homepage sections) ────────────────── */

.section {
  padding: var(--section-padding-mobile) 0;
}
@media (min-width: 834px) {
  .section {
    padding: var(--section-padding) 0;
  }
}

.section-white {
  background-color: var(--color-canvas-white);
  color: var(--color-ink);
}

.section-parchment {
  background-color: var(--color-canvas-parchment);
  color: var(--color-ink);
}

.section-dark {
  background-color: var(--color-canvas-dark);
  color: var(--color-canvas-white);
}

.section-inner {
  width: 100%;
  max-width: var(--hero-max);
  margin: 0 auto;
  padding: 0 24px;
}

@media (min-width: 834px) {
  .section-inner {
    padding: 0 32px;
  }
}

.section-header {
  margin-bottom: 56px;
}

@media (min-width: 834px) {
  .section-header {
    margin-bottom: 80px;
  }
}

.section-header-centered {
  text-align: center;
}

.section-headline {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--type-display-lg);
  line-height: 1.07;
  letter-spacing: var(--tracking-display);
  color: inherit;
  margin: 0;
}

@media (min-width: 834px) {
  .section-headline {
    font-size: var(--type-display-xl);
  }
}

.section-lead {
  font-family: var(--font-text);
  font-weight: 400;
  font-size: var(--type-body-lg);
  line-height: 1.47;
  letter-spacing: var(--tracking-body);
  color: var(--color-ink-tertiary);
  max-width: 560px;
  margin: 16px 0 0;
}

.section-header-centered .section-lead {
  margin-left: auto;
  margin-right: auto;
}

.section-lead-light {
  color: rgba(255, 255, 255, 0.7);
}

/* ─── Eyebrows (BRAND_BRIEF §2) ───────────────────────────────────────────── */

.eyebrow {
  display: inline-block;
  font-family: var(--font-text);
  font-weight: 600;
  font-size: var(--type-eyebrow);
  line-height: 1.3;
  letter-spacing: var(--tracking-label);
  text-transform: none;
  margin-bottom: 12px;
}

.eyebrow-action {
  color: var(--color-action-blue);
}

.eyebrow-light {
  color: rgba(255, 255, 255, 0.55);
}

/* ─── 1. HERO ────────────────────────────────────────────────────────────── */

.hero {
  position: relative;
  width: 100%;
  min-height: 100vh;
  min-height: 100dvh;
  overflow: hidden;
  background-color: var(--color-canvas-black);
  color: var(--color-canvas-white);
  display: flex;
  align-items: flex-end;
  justify-content: flex-start;
  padding-top: 52px; /* nav clearance */
  padding-bottom: 15vh; /* anchor content to product */
  padding-left: 5%;
}

.hero-media {
  position: absolute;
  inset: 0;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

/* Layered gradient: heavier at the bottom for the CTA, gentle vignette top so
 * the headline reads against the photo without losing the image. */
/* ─── Hero Scroll Storytelling (Layer Parallax + Light Animation) ───────────── */
/*
 * Design intent: calm, physical presence, premium restraint.
 * - Background atmosphere moves slower (parallax 0.15x) → depth without zoom
 * - Pendant stays perfectly fixed → product focus, stability
 * - Subtle glow breathes → "aware" feeling, life without motion
 * - Vignette deepens → guides eye, adds weight
 * - All driven by --section-progress from scroll-orchestrator
 * - Respects prefers-reduced-motion: reduce (transforms → 0, opacity instant)
 */

.hero-gradient {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(
      180deg,
      rgba(0, 0, 0, 0.35) 0%,
      rgba(0, 0, 0, 0.15) 35%,
      rgba(0, 0, 0, var(--hero-vignette-base, 0.55)) 100%
    ),
    radial-gradient(
      120% 80% at 50% 35%,
      transparent 0%,
      rgba(0, 0, 0, var(--hero-vignette-radial, 0.2)) 100%
    );
  pointer-events: none;
  /* Parallax: background moves slower than scroll */
  transform: translateY(calc(var(--hero-parallax-y, 0) * 1px));
  will-change: transform, background;
}

/* Glow layer — breathes behind the pendant */
.hero-gradient::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(
    60% 40% at 50% 40%,
    rgba(0, 102, 204, var(--hero-glow-opacity, 0)) 0%,
    transparent 70%
  );
  opacity: var(--hero-glow-opacity, 0);
  pointer-events: none;
  will-change: opacity;
}

/* Hero media — pendant stays fixed (0x parallax) */
.hero-media {
  position: absolute;
  inset: 0;
  /* Counter-transform to keep pendant visually stable during background parallax */
  transform: translateY(calc(var(--hero-parallax-y, 0) * -0.15 * 1px));
  will-change: transform;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

/* Reduced motion: disable all hero scroll motion */
@media (prefers-reduced-motion: reduce) {
  .hero-gradient,
  .hero-gradient::after,
  .hero-media {
    transform: none !important;
    animation: none !important;
    transition: none !important;
  }
  .hero-gradient {
    background:
      linear-gradient(
        180deg,
        rgba(0, 0, 0, 0.35) 0%,
        rgba(0, 0, 0, 0.15) 35%,
        rgba(0, 0, 0, 0.55) 100%
      ),
      radial-gradient(
        120% 80% at 50% 35%,
        transparent 0%,
        rgba(0, 0, 0, 0.2) 100%
      );
  }
  .hero-gradient::after {
    opacity: 0;
  }
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: left;
  width: 100%;
  max-width: 480px;
  padding: 0 24px;
}

.hero-headline {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(56px, 9vw, 80px);
  line-height: 1.05;
  letter-spacing: var(--tracking-hero);
  margin: 4px 0 12px;
  color: var(--color-canvas-white);
}

.hero-tagline {
  font-family: var(--font-text);
  font-weight: 600;
  font-size: var(--type-tagline);
  line-height: 1.19;
  letter-spacing: var(--tracking-body);
  color: rgba(255, 255, 255, 0.85);
  margin: 0 0 28px;
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: flex-start;
  align-items: center;
}

.btn-hero-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  background: var(--color-action-blue);
  color: var(--color-canvas-white);
  border-radius: var(--radius-pill);
  font-family: var(--font-text);
  font-size: var(--type-body);
  font-weight: 500;
  letter-spacing: var(--tracking-body);
  text-decoration: none;
  transition:
    transform var(--duration-fast) var(--ease-spring),
    background-color var(--duration-normal) var(--ease-out);
}

.btn-hero-primary:hover {
  background: var(--color-focus-blue);
}

.btn-hero-primary:active {
  transform: scale(0.95);
}

.btn-chevron {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  margin-left: 12px;
  border-radius: var(--radius-pill);
  background: var(--color-focus-blue);
  color: var(--color-canvas-white);
  transition: transform var(--duration-normal) var(--ease-spring);
}

.btn-hero-primary:hover .btn-chevron {
  transform: translateX(2px);
}

/* ─── 2. CAPABILITIES ────────────────────────────────────────────────────── */

.capability-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
}

@media (min-width: 834px) {
  .capability-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 64px;
  }
}

.capability-trust {
  font-family: var(--font-text);
  font-size: var(--type-body-sm);
  font-weight: 400;
  line-height: 1.4;
  letter-spacing: var(--tracking-body-sm);
  color: var(--color-ink-tertiary);
  text-align: center;
  max-width: 560px;
  margin: var(--spacing-xl) auto 0;
}

.capability-trust .text-link {
  color: var(--color-action-blue);
  text-decoration: none;
}

.capability-trust .text-link:hover {
  text-decoration: underline;
}

.capability {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 360px;
}

.capability-number {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--type-caption-strong);
  letter-spacing: 0.08em;
  color: var(--color-action-blue);
}

.capability-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--type-tagline);
  line-height: 1.19;
  letter-spacing: var(--tracking-title);
  color: var(--color-ink);
  margin: 0;
}

.capability-body {
  font-family: var(--font-text);
  font-weight: 400;
  font-size: var(--type-body);
  line-height: 1.47;
  letter-spacing: var(--tracking-body);
  color: var(--color-ink-tertiary);
  margin: 0;
}

.capability-meta {
  font-family: var(--font-text);
  font-weight: 600;
  font-size: var(--type-micro);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-ink-tertiary);
  margin-bottom: 4px;
}

/* ─── 3. THIRD DEVICE — dark tile ────────────────────────────────────────── */

.third-device-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

@media (min-width: 834px) {
  .third-device-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    max-width: 720px;
    margin: 0 auto;
  }
}

.glass-sub-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 32px 24px;
  text-align: center;
  background: rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(30px) saturate(180%);
  -webkit-backdrop-filter: blur(30px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  transition:
    transform var(--duration-normal) var(--ease-spring),
    background-color var(--duration-normal) var(--ease-out);
}

.glass-sub-card:hover {
  background: rgba(255, 255, 255, 0.1);
}

.glass-sub-card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.08);
  color: rgba(255, 255, 255, 0.9);
}

.glass-sub-card-label {
  font-family: var(--font-text);
  font-weight: 600;
  font-size: var(--type-body-strong);
  line-height: 1.24;
  letter-spacing: var(--tracking-body);
  color: var(--color-canvas-white);
  margin: 0;
}

/* ─── 4. SPECIFICATIONS — parchment tile ─────────────────────────────────── */

.specs-header {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-bottom: 56px;
}

@media (min-width: 834px) {
  .specs-header {
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
    margin-bottom: 80px;
  }
}

.specs-header-copy .section-lead {
  margin-top: 16px;
}

.specs-figure {
  margin: 0;
  display: flex;
  justify-content: center;
}

.specs-figure img {
  width: 100%;
  max-width: 520px;
  height: auto;
  object-fit: contain;
}

.spec-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  margin: 0;
}

@media (min-width: 834px) {
  .spec-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 48px;
  }
}

.spec {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.spec-value {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--type-display-xl);
  line-height: 1.07;
  letter-spacing: var(--tracking-display);
  color: var(--color-ink);
  margin: 0;
}

@media (min-width: 834px) {
  .spec-value {
    font-size: var(--type-hero-display);
  }
}

.spec-label {
  font-family: var(--font-text);
  font-weight: 600;
  font-size: var(--type-caption-strong);
  line-height: 1.29;
  letter-spacing: var(--tracking-label);
  color: var(--color-ink-tertiary);
  margin: 0;
}

.spec-detail {
  font-family: var(--font-text);
  font-weight: 400;
  font-size: var(--type-body-sm);
  line-height: 1.4;
  letter-spacing: var(--tracking-body);
  color: var(--color-ink-tertiary);
  margin: 4px 0 0;
  max-width: 280px;
}

/* ─── 5. BUILD CTA ───────────────────────────────────────────────────────── */

.build-card {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: center;
  padding: 40px;
  background: var(--color-canvas-parchment);
  border-radius: var(--radius-xl);
}

@media (min-width: 834px) {
  .build-card {
    grid-template-columns: 1.1fr 1fr;
    gap: 48px;
    padding: 64px;
  }
}

.build-card-headline {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--type-display-md);
  line-height: 1.1;
  letter-spacing: var(--tracking-display);
  color: var(--color-ink);
  margin: 0 0 16px;
}

@media (min-width: 834px) {
  .build-card-headline {
    font-size: var(--type-display-xl);
  }
}

.build-card-body {
  font-family: var(--font-text);
  font-weight: 400;
  font-size: var(--type-body-lg);
  line-height: 1.47;
  letter-spacing: var(--tracking-body);
  color: var(--color-ink-tertiary);
  margin: 0 0 32px;
  max-width: 480px;
}

.build-card-ctas {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 24px;
}

.build-card-figure {
  margin: 0;
  display: flex;
  justify-content: center;
}

.build-card-figure img {
  width: 100%;
  max-width: 480px;
  height: auto;
  object-fit: contain;
}

.btn-primary-arrow {
  padding: 8px 8px 8px 24px;
}

.btn-primary-arrow:hover .btn-chevron {
  transform: translateX(2px);
}

.btn-link {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-text);
  font-weight: 400;
  font-size: var(--type-body);
  letter-spacing: var(--tracking-body);
  color: var(--color-action-blue);
  text-decoration: none;
  transition:
    color var(--duration-normal) var(--ease-out),
    transform var(--duration-fast) var(--ease-spring);
}

.btn-link:hover {
  color: var(--color-focus-blue);
}

.btn-link:active {
  transform: scale(0.97);
}

/* ── Capabilities glass cards (BRAND_BRIEF §9 exception) ───────────── */
.capability-grid {
  position: relative;
}

.capability-backdrop {
  position: absolute;
  inset: -40px -40px;
  background: radial-gradient(
    ellipse at 50% 0%,
    rgba(0, 102, 204, 0.06) 0%,
    transparent 70%
  );
  pointer-events: none;
  z-index: 0;
}

.capability {
  position: relative;
  z-index: 1;
}

.capability.glass-card {
  background: var(--bg-glass);
  backdrop-filter: var(--blur-glass);
  -webkit-backdrop-filter: var(--blur-glass);
  border: 1px solid rgba(210, 210, 215, 0.3);
  border-radius: var(--radius-lg, 18px);
  padding: var(--spacing-xl, 32px);
  transition: transform var(--duration-normal) var(--ease-out);
}

.hero-text-link {
  color: var(--color-sky-blue);
  text-decoration: none;
  font-size: var(--type-body, 17px);
  font-weight: 400;
  transition: opacity 0.2s ease;
}

.hero-text-link:hover {
  opacity: 0.8;
  text-decoration: underline;
}

/* ── FAQ Accordion (footer area) ───────────────────────────────────── */

.faq-list {
  display: grid;
  gap: 12px;
  max-width: 720px;
}

.faq-item {
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-canvas-white);
}

.faq-question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 24px;
  background: transparent;
  border: none;
  font-family: var(--font-text);
  font-size: var(--type-body);
  font-weight: 500;
  color: var(--color-ink);
  text-align: left;
  cursor: pointer;
  transition: background-color var(--duration-fast) var(--ease-out);
}

.faq-question:hover {
  background: var(--color-canvas-parchment);
}

.faq-question::after {
  content: "+";
  font-size: var(--type-display-sm);
  font-weight: 300;
  color: var(--color-ink-tertiary);
  transition: transform var(--duration-normal) var(--ease-spring);
}

.faq-item[open] .faq-question::after {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  padding: 0 24px;
  font-family: var(--font-text);
  font-size: var(--type-body);
  line-height: 1.47;
  color: var(--color-ink-secondary);
  transition:
    max-height var(--duration-slow) var(--ease-spring),
    padding var(--duration-normal) var(--ease-out);
}

.faq-item[open] .faq-answer {
  max-height: 500px;
  padding: 0 24px 24px;
}