/* ============================================================
   STRATUM DERMATOLOGY — Hero Site (W12)
   3-row full-screen layout: nav / stats / bottom content.
   W12 exception to §11.5 standard hero composition.
   Font: Inter (Google Fonts) — no paid font substitution needed.
   Video tone: LIGHT (white bg, iridescent chrome object).
   Hover scrim: kept on F1 tile (light video needs scrim for label).
   ============================================================ */

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

html {
  height: 100%;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ── Design tokens ──────────────────────────────────────────── */
:root {
  --color-text:    #000000;
  --color-accent:  #5E0ED7;
  --color-soft-bg: #FFFFFF;
  --font-body:     'Inter', system-ui, -apple-system, sans-serif;
}

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-soft-bg);
  min-height: 100dvh;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ── Video background ───────────────────────────────────────── */
.video-wrapper {
  position: fixed;
  inset: 0;
  z-index: 0;
  background: var(--color-soft-bg);
  overflow: hidden;
}

.video-wrapper video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Minimal overlay — video is already light; just unifies the field */
.video-overlay {
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.06);
}

/* ── Page root ──────────────────────────────────────────────── */
.page-root {
  position: relative;
  z-index: 2;
  min-height: 100dvh;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Navigation ─────────────────────────────────────────────── */
.nav {
  display: flex;
  align-items: center;
  padding: clamp(16px, 2.5vw, 24px) clamp(20px, 6vw, 48px);
}

.nav-left {
  flex: 1;
  display: flex;
  align-items: center;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--color-text);
}

.logo-ring {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 2px solid var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.logo-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-accent);
}

.nav-wordmark {
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  white-space: nowrap;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--color-text);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  opacity: 0.7;
  transition: opacity 0.18s ease;
}

.nav-links a:hover {
  opacity: 1;
}

.nav-right {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: flex-end;
}

/* ── Hamburger ──────────────────────────────────────────────── */
.hamburger {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  width: 36px;
  height: 36px;
  background: #000;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  flex-shrink: 0;
  padding: 0;
  transition: opacity 0.18s ease;
}

.hamburger:hover {
  opacity: 0.8;
}

.hamburger span {
  display: block;
  width: 16px;
  height: 2px;
  background: #fff;
  border-radius: 1px;
}

/* ── Sheet backdrop ─────────────────────────────────────────── */
.sheet-backdrop {
  position: fixed;
  inset: 0;
  z-index: 50;
  background: rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.sheet-backdrop.is-open {
  opacity: 1;
  pointer-events: auto;
}

/* ── Mobile sheet ───────────────────────────────────────────── */
.mobile-sheet {
  position: fixed;
  top: 0;
  right: 0;
  width: min(88vw, 360px);
  height: 100dvh;
  height: 100vh;
  z-index: 51;
  background: var(--color-soft-bg);
  display: flex;
  flex-direction: column;
  padding: 20px 24px 32px;
  overflow-y: auto;
  box-shadow: -12px 0 48px rgba(0, 0, 0, 0.18);
  transform: translateX(100%);
  transition: transform 0.45s cubic-bezier(0.22, 1, 0.36, 1);
}

.mobile-sheet.is-open {
  transform: translateX(0);
}

.sheet-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 48px;
}

.sheet-close-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: #000;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  color: #fff;
  padding: 0;
  transition: opacity 0.18s ease;
}

.sheet-close-btn:hover {
  opacity: 0.8;
}

.sheet-nav {
  display: flex;
  flex-direction: column;
  flex: 1;
}

.sheet-link {
  display: block;
  padding: 10px 0;
  text-decoration: none;
  color: var(--color-text);
  font-size: 1.875rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  opacity: 0;
  transform: translateX(24px);
  transition: opacity 0.28s ease, transform 0.28s ease;
}

/* Staggered reveal */
.mobile-sheet.is-open .sheet-link:nth-child(1) { opacity: 1; transform: none; transition-delay: 0.18s; }
.mobile-sheet.is-open .sheet-link:nth-child(2) { opacity: 1; transform: none; transition-delay: 0.25s; }
.mobile-sheet.is-open .sheet-link:nth-child(3) { opacity: 1; transform: none; transition-delay: 0.32s; }
.mobile-sheet.is-open .sheet-link:nth-child(4) { opacity: 1; transform: none; transition-delay: 0.39s; }

.sheet-footer {
  padding-top: 24px;
  border-top: 1px solid rgba(0, 0, 0, 0.1);
  margin-top: auto;
}

.sheet-cta-link {
  display: flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
  color: var(--color-accent);
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: gap 0.2s ease;
}

.sheet-cta-link:hover {
  gap: 10px;
}

/* ── Stats row ──────────────────────────────────────────────── */
.stats-row {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding: 32px clamp(20px, 6vw, 48px);
}

.stats-inner {
  display: flex;
  align-items: flex-start;
  gap: clamp(20px, 4vw, 40px);
}

.stat {
  text-align: right;
}

.stat-number {
  font-size: clamp(1.5rem, 5vw, 3.5rem);
  font-weight: 600;
  line-height: 1;
  color: var(--color-text);
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.stat-plus {
  color: var(--color-accent);
  font-size: 0.5em;
  vertical-align: top;
  line-height: 1.6;
}

.stat-label {
  font-size: clamp(9px, 1.4vw, 13px);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  line-height: 1.35;
  text-align: right;
  margin-top: 6px;
  white-space: nowrap;
}

/* ── Bottom section ─────────────────────────────────────────── */
.bottom-section {
  display: flex;
  flex-direction: column;
  gap: clamp(16px, 2.5vw, 48px);
  padding: 0 clamp(20px, 6vw, 48px) clamp(24px, 4vw, 48px);
}

/* Row A */
.row-a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.tagline {
  font-size: clamp(9px, 1.4vw, 13px);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  line-height: 1.55;
  max-width: clamp(130px, 24vw, 320px);
}

.work-cta {
  display: flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
  color: var(--color-accent);
  font-size: clamp(1rem, 2.5vw, 1.5rem);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  white-space: nowrap;
  transition: gap 0.2s ease;
}

.work-cta:hover {
  gap: 10px;
}

/* Row B */
.row-b {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: clamp(12px, 3vw, 32px);
}

.description {
  width: clamp(120px, 18vw, 280px);
  flex-shrink: 0;
  font-size: clamp(8px, 1.1vw, 13px);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  line-height: 1.55;
}

.heading-block {
  text-align: right;
  flex: 1;
}

.heading-overflow {
  display: block;
  overflow: hidden;
}

.heading-word {
  display: block;
  font-size: clamp(2.25rem, 9vw, 9rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  text-transform: uppercase;
  color: var(--color-text);
  line-height: 0.9;
  text-align: right;
  white-space: nowrap;
}

/* ── Keyframe definitions ───────────────────────────────────── */
@keyframes fadeDown {
  from { opacity: 0; transform: translateY(-20px); }
  to   { opacity: 1; transform: translateY(0);     }
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(32px); }
  to   { opacity: 1; transform: translateY(0);    }
}

@keyframes slideUp {
  from { transform: translateY(110%); }
  to   { transform: translateY(0);    }
}

/* ── Entrance animations (gated on prefers-reduced-motion) ──── */
@media (prefers-reduced-motion: no-preference) {
  /* Nav: fadeDown */
  .anim-fade-down {
    animation-name: fadeDown;
    animation-duration: 0.5s;
    animation-timing-function: cubic-bezier(0.22, 1, 0.36, 1);
    animation-fill-mode: both;
  }
  .anim-d0 { animation-delay: 0s;    }
  .anim-d1 { animation-delay: 0.1s;  }
  .anim-d2 { animation-delay: 0.2s;  }
  .anim-d3 { animation-delay: 0.3s;  }
  .anim-d4 { animation-delay: 0.4s;  }
  .anim-d5 { animation-delay: 0.5s;  }

  /* Stats + bottom: fadeUp */
  .anim-fade-up {
    animation-name: fadeUp;
    animation-duration: 0.6s;
    animation-timing-function: cubic-bezier(0.22, 1, 0.36, 1);
    animation-fill-mode: both;
  }
  .anim-u1 { animation-delay: 0.24s; }
  .anim-u2 { animation-delay: 0.36s; }
  .anim-u3 { animation-delay: 0.48s; }
  .anim-u4 { animation-delay: 0.60s; }
  .anim-u5 { animation-delay: 0.72s; }
  .anim-u6 { animation-delay: 0.84s; }

  /* Heading: clip-reveal slide up */
  .word-0 { animation: slideUp 0.7s cubic-bezier(0.22, 1, 0.36, 1) 0.40s both; }
  .word-1 { animation: slideUp 0.7s cubic-bezier(0.22, 1, 0.36, 1) 0.54s both; }
  .word-2 { animation: slideUp 0.7s cubic-bezier(0.22, 1, 0.36, 1) 0.68s both; }
}

/* ── Responsive ─────────────────────────────────────────────── */
@media (max-width: 767px) {
  .nav-links   { display: none; }
  .hamburger   { display: flex; }

  /* Column layout for row-b on small screens */
  .row-b {
    flex-direction: column;
    align-items: flex-end;
    gap: 8px;
  }

  .description {
    width: auto;
    text-align: right;
    font-size: clamp(8px, 2.5vw, 11px);
    max-width: 240px;
  }

  .heading-word {
    font-size: clamp(2rem, 12vw, 3.5rem);
    line-height: 0.92;
  }

  .stats-row {
    padding: 20px clamp(20px, 5vw, 32px);
  }

  .stats-inner {
    gap: 16px;
  }

  .stat-number {
    font-size: clamp(1.25rem, 7vw, 2.5rem);
  }
}

@media (min-width: 768px) {
  .hamburger { display: none; }
}