/* Architecture scroll experience */

:root {
  --ink: #141418;
  --ink-soft: #2a2a32;
  --parchment: #f3efe6;
  --stone: #8a8478;
  --copper: #c49a5c;
  --copper-dim: rgba(196, 154, 92, 0.35);
  --mist: rgba(243, 239, 230, 0.9);
  --shadow: rgba(20, 20, 24, 0.5);

  --font: "Vazirmatn", Tahoma, sans-serif;
  --header-h: clamp(3.5rem, 8vw, 4.5rem);
  --scroll-per-frame: 14px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  font-weight: 300;
  color: var(--parchment);
  background: var(--ink);
  line-height: 1.75;
}

a {
  color: inherit;
  text-decoration: none;
}

.skip-link {
  position: absolute;
  top: -100%;
  right: 1rem;
  z-index: 9999;
  padding: 0.75rem 1rem;
  background: var(--copper);
  color: var(--ink);
  border-radius: 0.25rem;
}

.skip-link:focus {
  top: 1rem;
}

/* Header */

.site-header {
  position: fixed;
  inset-inline: 0;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  height: var(--header-h);
  padding-inline: clamp(1rem, 4vw, 3rem);
  background: linear-gradient(to bottom, rgba(20, 20, 24, 0.9), transparent);
  backdrop-filter: blur(8px);
  pointer-events: none;
}

.site-header > * {
  pointer-events: auto;
}

.brand {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  font-weight: 700;
  letter-spacing: 0.35em;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(0.75rem, 2vw, 1.5rem);
  font-size: clamp(0.75rem, 1.8vw, 0.9rem);
  font-weight: 400;
}

.nav a {
  opacity: 0.75;
  transition: opacity 0.25s ease, color 0.25s ease;
}

.nav a:hover,
.nav a:focus-visible {
  opacity: 1;
  color: var(--copper);
  outline: none;
}

/* Hero */

.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  place-items: center;
  padding: calc(var(--header-h) + 2rem) clamp(1.25rem, 5vw, 4rem) 4rem;
  background:
    radial-gradient(ellipse 80% 60% at 70% 20%, rgba(196, 154, 92, 0.12), transparent 60%),
    linear-gradient(160deg, #1c1c22 0%, var(--ink) 55%, #0f0f12 100%);
  overflow: clip;
}

.hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(196, 154, 92, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(196, 154, 92, 0.08) 1px, transparent 1px);
  background-size: clamp(40px, 8vw, 80px) clamp(40px, 8vw, 80px);
  mask-image: radial-gradient(ellipse 70% 70% at 50% 40%, black, transparent);
  animation: grid-drift 24s linear infinite;
}

@keyframes grid-drift {
  from { transform: translateY(0); }
  to { transform: translateY(clamp(40px, 8vw, 80px)); }
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 42rem;
  text-align: center;
  will-change: transform;
}

.eyebrow {
  margin: 0 0 1rem;
  font-size: clamp(0.75rem, 1.8vw, 0.875rem);
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--copper);
}

.hero h1 {
  margin: 0 0 1.25rem;
  font-size: clamp(2.5rem, 9vw, 5.5rem);
  font-weight: 200;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.hero h1 span {
  font-weight: 700;
  color: var(--copper);
}

.hero__lead {
  margin: 0 auto 2rem;
  max-width: 32rem;
  font-size: clamp(0.95rem, 2.2vw, 1.125rem);
  color: rgba(243, 239, 230, 0.78);
}

.cta {
  display: inline-block;
  padding: 0.9rem 1.75rem;
  border: 1px solid var(--copper);
  color: var(--parchment);
  font-size: clamp(0.875rem, 2vw, 1rem);
  font-weight: 500;
  transition: background 0.3s ease, transform 0.3s ease;
}

.cta:hover,
.cta:focus-visible {
  background: var(--copper);
  color: var(--ink);
  transform: translateY(-2px);
  outline: none;
}

.cta--light {
  border-color: var(--parchment);
}

.cta--light:hover,
.cta--light:focus-visible {
  background: var(--parchment);
  color: var(--ink);
}

.scroll-hint {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  opacity: 0.55;
}

.scroll-hint__line {
  width: 1px;
  height: 3rem;
  background: linear-gradient(to bottom, var(--copper), transparent);
  animation: hint-pulse 2s ease-in-out infinite;
}

@keyframes hint-pulse {
  0%, 100% { transform: scaleY(1); opacity: 0.5; }
  50% { transform: scaleY(1.2); opacity: 1; }
}

/* Scroll-driven video section */

.scroll-stage {
  position: relative;
  height: calc(100svh + var(--frame-count, 192) * var(--scroll-per-frame));
}

.scroll-stage__pin {
  position: sticky;
  top: 0;
  height: 100svh;
  width: 100%;
  overflow: hidden;
  background: #000;
}

.frame-canvas {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.scroll-stage__shade {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to bottom, rgba(20, 20, 24, 0.55) 0%, transparent 22%, transparent 72%, rgba(20, 20, 24, 0.65) 100%),
    linear-gradient(to left, rgba(20, 20, 24, 0.25), transparent 40%);
  pointer-events: none;
  z-index: 2;
}

.parallax-grid {
  position: absolute;
  inset: -10%;
  background-image:
    linear-gradient(rgba(196, 154, 92, 0.12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(196, 154, 92, 0.12) 1px, transparent 1px);
  background-size: clamp(48px, 10vw, 96px) clamp(48px, 10vw, 96px);
  mask-image: radial-gradient(ellipse 80% 70% at 50% 50%, black 20%, transparent 75%);
  pointer-events: none;
  z-index: 3;
  will-change: transform;
}

.scroll-overlays {
  position: absolute;
  inset: 0;
  z-index: 4;
  pointer-events: none;
}

.overlay {
  position: absolute;
  inset-inline: clamp(1rem, 4vw, 3rem);
  will-change: transform;
}

.overlay--top {
  top: calc(var(--header-h) + 0.5rem);
  display: flex;
  align-items: center;
  gap: 1rem;
}

.overlay__line {
  flex: 1;
  height: 1px;
  background: linear-gradient(to left, transparent, var(--copper-dim), transparent);
}

.overlay__tag {
  margin: 0;
  font-size: clamp(0.65rem, 1.5vw, 0.75rem);
  letter-spacing: 0.25em;
  color: rgba(243, 239, 230, 0.85);
  text-shadow: 0 1px 8px rgba(0, 0, 0, 0.6);
}

.frame-counter {
  position: absolute;
  top: calc(var(--header-h) + 0.5rem);
  inset-inline-start: clamp(1rem, 4vw, 3rem);
  font-size: clamp(0.8rem, 2vw, 1rem);
  font-weight: 300;
  letter-spacing: 0.15em;
  color: rgba(243, 239, 230, 0.9);
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.7);
  will-change: transform;
}

.frame-counter__current {
  font-weight: 600;
  color: var(--copper);
}

.frame-counter__sep {
  margin-inline: 0.25rem;
  opacity: 0.5;
}

.caption {
  position: absolute;
  max-width: min(22rem, 88vw);
  padding: clamp(1rem, 3vw, 1.5rem);
  background: var(--mist);
  color: var(--ink);
  backdrop-filter: blur(14px);
  border-inline-start: 3px solid var(--copper);
  box-shadow: 0 1rem 3rem var(--shadow);
  opacity: 0;
  will-change: transform, opacity;
  transition: opacity 0.15s linear;
}

.caption__num {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--copper);
}

.caption h2 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  font-weight: 600;
}

.caption p {
  margin: 0;
  font-size: clamp(0.8rem, 1.8vw, 0.95rem);
  color: var(--ink-soft);
  line-height: 1.65;
}

.caption--1 {
  bottom: clamp(5rem, 18vh, 10rem);
  inset-inline-start: clamp(1rem, 5vw, 4rem);
}

.caption--2 {
  top: 50%;
  inset-inline-end: clamp(1rem, 5vw, 4rem);
  margin-top: -4rem;
}

.caption--3 {
  bottom: clamp(4rem, 14vh, 8rem);
  inset-inline-start: 50%;
  transform: translateX(50%);
  text-align: center;
  border-inline-start: none;
  border-top: 3px solid var(--copper);
}

.progress {
  position: absolute;
  bottom: clamp(1rem, 3vh, 2rem);
  inset-inline-end: clamp(1rem, 4vw, 3rem);
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.5rem;
  will-change: transform;
}

.progress__bar {
  width: clamp(5rem, 14vw, 8rem);
  height: 2px;
  background: rgba(243, 239, 230, 0.25);
  overflow: hidden;
}

.progress__bar-fill {
  width: 100%;
  height: 100%;
  background: var(--copper);
  transform: scaleX(0);
  transform-origin: right center;
  will-change: transform;
}

.progress__label {
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  opacity: 0.75;
  text-shadow: 0 1px 6px rgba(0, 0, 0, 0.6);
}

/* Philosophy */

.philosophy {
  position: relative;
  padding: clamp(4rem, 12vw, 8rem) clamp(1.25rem, 5vw, 4rem);
  background: linear-gradient(180deg, var(--ink) 0%, #1a1a20 50%, var(--ink) 100%);
}

.philosophy__inner {
  max-width: 72rem;
  margin-inline: auto;
}

.philosophy__intro {
  max-width: 38rem;
  margin-bottom: clamp(2.5rem, 6vw, 4rem);
}

.philosophy__intro h2 {
  margin: 0 0 1rem;
  font-size: clamp(1.75rem, 5vw, 3rem);
  font-weight: 300;
  line-height: 1.25;
}

.philosophy__intro p:last-child {
  margin: 0;
  color: rgba(243, 239, 230, 0.72);
  font-size: clamp(0.95rem, 2vw, 1.05rem);
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 16rem), 1fr));
  gap: clamp(1rem, 3vw, 1.75rem);
}

.card {
  position: relative;
  padding: clamp(1.5rem, 4vw, 2rem);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(196, 154, 92, 0.18);
  transition: border-color 0.3s ease, transform 0.3s ease;
}

.card:hover {
  border-color: var(--copper);
  transform: translateY(-4px);
}

.card__index {
  display: block;
  margin-bottom: 0.75rem;
  font-size: 2rem;
  font-weight: 100;
  color: var(--copper);
  line-height: 1;
}

.card h3 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.1rem, 2.5vw, 1.35rem);
  font-weight: 600;
}

.card p {
  margin: 0;
  font-size: clamp(0.85rem, 1.8vw, 0.95rem);
  color: rgba(243, 239, 230, 0.68);
}

/* Stats */

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 10rem), 1fr));
  gap: 1px;
  background: rgba(196, 154, 92, 0.2);
  border-block: 1px solid rgba(196, 154, 92, 0.2);
}

.stats__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  padding: clamp(2rem, 5vw, 3rem) 1rem;
  background: var(--ink-soft);
  text-align: center;
}

.stats__item strong {
  font-size: clamp(2rem, 6vw, 3rem);
  font-weight: 200;
  color: var(--copper);
  line-height: 1;
}

.stats__item span {
  font-size: clamp(0.8rem, 1.8vw, 0.9rem);
  opacity: 0.7;
}

/* Contact */

.contact {
  position: relative;
  padding: clamp(5rem, 14vw, 10rem) clamp(1.25rem, 5vw, 4rem);
  text-align: center;
  background:
    radial-gradient(ellipse 60% 50% at 50% 100%, rgba(196, 154, 92, 0.15), transparent),
    var(--ink);
}

.contact__content {
  max-width: 32rem;
  margin-inline: auto;
}

.contact h2 {
  margin: 0 0 1rem;
  font-size: clamp(1.75rem, 5vw, 2.75rem);
  font-weight: 300;
}

.contact p:not(.eyebrow) {
  margin: 0 0 2rem;
  color: rgba(243, 239, 230, 0.72);
}

/* Footer */

.site-footer {
  padding: 1.5rem clamp(1.25rem, 5vw, 4rem);
  text-align: center;
  font-size: 0.8rem;
  color: rgba(243, 239, 230, 0.45);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

/* Responsive */

@media (max-width: 768px) {
  :root {
    --scroll-per-frame: 18px;
  }

  .nav {
    display: none;
  }

  .caption--2 {
    top: auto;
    bottom: clamp(9rem, 24vh, 13rem);
    inset-inline-end: clamp(1rem, 4vw, 2rem);
    margin-top: 0;
  }

  .caption--3 {
    inset-inline-start: clamp(1rem, 4vw, 2rem);
    transform: none;
    text-align: right;
  }

  .overlay--top {
    display: none;
  }

  .frame-counter {
    top: auto;
    bottom: clamp(1rem, 3vh, 2rem);
    inset-inline-start: clamp(1rem, 4vw, 3rem);
  }
}

@media (max-width: 480px) {
  :root {
    --scroll-per-frame: 22px;
  }

  .brand {
    letter-spacing: 0.2em;
  }

  .caption {
    max-width: calc(100% - 2rem);
  }
}

@media (min-width: 1200px) {
  :root {
    --scroll-per-frame: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .hero__grid,
  .scroll-hint__line {
    animation: none;
  }

  .caption {
    opacity: 1 !important;
    transform: none !important;
  }
}