/* ==========================================================================
   OTIIS DESIGN SYSTEM — styles.css
   A disciplined black-and-yellow brand with dark/light theme support.
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:ital,wght@0,400;0,500;0,600;1,400&family=Space+Grotesk:wght@400;500;600;700&family=Space+Mono:wght@400;700&display=swap');

/* --------------------------------------------------------------------------
   1. THEME TOKENS
   -------------------------------------------------------------------------- */
:root {
  /* Static brand tokens (never change) */
  --color-yellow: #FFC42B;
  --color-deep-yellow: #C8961A;
  --color-black: #0E0E0E;
  --color-white: #FFFFFF;

  /* Font stacks */
  --font-display: 'Space Grotesk', -apple-system, sans-serif;
  --font-body: 'IBM Plex Sans', -apple-system, sans-serif;
  --font-mono: 'Space Mono', 'Menlo', monospace;

  /* Timing */
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);
  --duration-fast: 0.2s;
  --duration-base: 0.4s;
  --duration-slow: 0.8s;
}

:root[data-theme="dark"] {
  --color-bg: #0E0E0E;
  --color-bg-elevated: #141414;
  --color-bg-surface: #1A1A1A;
  --color-text-primary: #FFFFFF;
  --color-text-secondary: #B8B8B0;
  --color-text-tertiary: #8A8A83;
  --color-accent: #FFC42B;
  --color-accent-text: #FFC42B;
  --color-border: #262626;
  --color-border-subtle: #1E1E1E;
  --color-glow: rgba(255, 196, 43, 0.35);
  --color-grain: rgba(255, 255, 255, 0.015);
  --nav-bg: rgba(14, 14, 14, 0.8);
  --color-scrollbar: #3A3A3A;
  --shadow-card: 0 2px 20px rgba(0, 0, 0, 0.3);
  --shadow-card-hover: 0 8px 40px rgba(0, 0, 0, 0.5);
}

:root[data-theme="light"] {
  --color-bg: #F5F5F2;
  --color-bg-elevated: #FFFFFF;
  --color-bg-surface: #EDEDEA;
  --color-text-primary: #0E0E0E;
  --color-text-secondary: #4A4A45;
  --color-text-tertiary: #70706A;
  --color-accent: #FFC42B;
  --color-accent-text: #C8961A;
  --color-border: #DDDDD7;
  --color-border-subtle: #E8E8E3;
  --color-glow: rgba(200, 150, 26, 0.2);
  --color-grain: rgba(0, 0, 0, 0.015);
  --nav-bg: rgba(245, 245, 242, 0.8);
  --color-scrollbar: #C0C0B8;
  --shadow-card: 0 2px 20px rgba(0, 0, 0, 0.06);
  --shadow-card-hover: 0 8px 40px rgba(0, 0, 0, 0.12);
}

/* --------------------------------------------------------------------------
   2. GLOBAL RESET & BASE
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--color-bg);
  color: var(--color-text-primary);
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  transition: background-color var(--duration-base) var(--ease-out-expo),
              color var(--duration-base) var(--ease-out-expo);
}

/* Smooth theme transitions on all common elements */
section, header, footer, main,
div, p, h1, h2, h3, h4, a, span, label, input, textarea, button {
  transition: background-color var(--duration-base) var(--ease-out-expo),
              color var(--duration-fast) ease,
              border-color var(--duration-base) var(--ease-out-expo);
}

/* Noise grain overlay — applied to body for premium depth */
body::after {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 10000;
  opacity: 0.4;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.03'/%3E%3C/svg%3E");
}

/* Custom scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--color-bg); }
::-webkit-scrollbar-thumb {
  background: var(--color-scrollbar);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover { background: var(--color-accent); }

/* Selection */
::selection {
  background-color: var(--color-accent);
  color: var(--color-black);
}

/* --------------------------------------------------------------------------
   3. TYPOGRAPHY
   -------------------------------------------------------------------------- */
.font-display {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--color-text-primary);
}

.font-body {
  font-family: var(--font-body);
}

.font-mono {
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.8rem;
  font-weight: 700;
}

h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.8rem, 7.5vw, 6rem);
  line-height: 0.95;
  letter-spacing: -0.03em;
  color: var(--color-text-primary);
  margin-bottom: 1.5rem;
}

h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 5vw, 3.5rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
  margin-bottom: 1.5rem;
}

h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.4rem, 3vw, 2rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
  margin-bottom: 1rem;
}

p {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  line-height: 1.65;
  margin-bottom: 1.5rem;
}

.caption {
  font-size: 0.875rem;
  color: var(--color-text-tertiary);
}

.section-eyebrow {
  margin-bottom: 1.25rem;
  color: var(--color-accent-text);
}

.section-thesis {
  font-size: clamp(1.25rem, 2.5vw, 1.75rem);
  line-height: 1.5;
  color: var(--color-text-secondary);
  max-width: 850px;
  margin-bottom: 4rem;
}

/* --------------------------------------------------------------------------
   4. LINKS & FOCUS
   -------------------------------------------------------------------------- */
a {
  color: inherit;
  text-decoration-skip-ink: auto;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 2px;
}

/* --------------------------------------------------------------------------
   5. LAYOUT
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 4rem;
}

@media (max-width: 1024px) {
  .container { padding: 0 2.5rem; }
}
@media (max-width: 640px) {
  .container { padding: 0 1.25rem; }
}

/* --------------------------------------------------------------------------
   6. HEADER / NAVIGATION
   -------------------------------------------------------------------------- */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 1.5rem 0;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background-color: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color 0.3s, border-bottom-color 0.3s, padding 0.3s;
}

header.scrolled {
  background-color: var(--nav-bg);
  border-bottom-color: var(--color-border);
  padding: 0.875rem 0;
}

header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.6rem;
  letter-spacing: -0.04em;
  color: var(--color-text-primary);
  transition: opacity var(--duration-fast);
  z-index: 1100;
}

.logo:hover { opacity: 0.8; }

.logo .yellow-ii {
  color: var(--color-yellow);
}

/* Nav links */
.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-links li {
  display: flex;
  align-items: center;
}

.nav-links a:not(.btn) {
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-tertiary);
  position: relative;
  padding: 0.25rem 0;
  transition: color var(--duration-fast);
}

.nav-links a:not(.btn):hover,
.nav-links a:not(.btn).active {
  color: var(--color-text-primary);
}

.nav-links a:not(.btn)::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 1px;
  background-color: var(--color-accent);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.3s var(--ease-out-expo);
}

.nav-links a:not(.btn):hover::after,
.nav-links a:not(.btn).active::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* --------------------------------------------------------------------------
   7. BUTTONS
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 2rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: all 0.3s var(--ease-out-expo);
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background-color: var(--color-accent);
  color: var(--color-black);
  border-color: var(--color-accent);
}

.btn-primary:hover {
  background-color: #E5AF1F;
  border-color: #E5AF1F;
  box-shadow: 0 4px 24px var(--color-glow);
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-text-primary);
  border-color: var(--color-border);
}

.btn-secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent-text);
  transform: translateY(-1px);
}

/* Nav CTA (compact variant) */
.btn-nav {
  padding: 0.75rem 1.5rem;
  font-size: 0.75rem;
}

/* --------------------------------------------------------------------------
   8. THEME TOGGLE
   -------------------------------------------------------------------------- */
.theme-toggle {
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  width: 2rem;
  height: 2rem;
  color: var(--color-text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color var(--duration-fast), transform var(--duration-fast);
}

.theme-toggle:hover {
  border-color: var(--color-accent);
  transform: rotate(15deg);
}

.theme-toggle svg {
  width: 0.875rem;
  height: 0.875rem;
  fill: currentColor;
}

/* --------------------------------------------------------------------------
   9. CUSTOM CURSOR (desktop, no reduced-motion)
   -------------------------------------------------------------------------- */
.custom-cursor {
  width: 6px;
  height: 6px;
  background-color: var(--color-accent);
  border-radius: 50%;
  position: fixed;
  transform: translate(-50%, -50%);
  pointer-events: none;
  z-index: 9999;
  mix-blend-mode: difference;
  display: none;
  transition: width 0.15s, height 0.15s;
}

.custom-cursor-follower {
  width: 28px;
  height: 28px;
  border: 1px solid rgba(255, 196, 43, 0.5);
  border-radius: 50%;
  position: fixed;
  transform: translate(-50%, -50%);
  pointer-events: none;
  z-index: 9998;
  display: none;
  transition: width 0.25s var(--ease-out-expo),
              height 0.25s var(--ease-out-expo),
              background-color 0.25s,
              border-color 0.25s;
}

/* --------------------------------------------------------------------------
   10. ASCENT RAIL SIGNATURE (Desktop)
   -------------------------------------------------------------------------- */
.ascent-rail-container {
  position: fixed;
  left: 2.5rem;
  top: 50%;
  transform: translateY(-50%);
  height: 55vh;
  width: 2rem;
  z-index: 900;
  pointer-events: none;
}

.ascent-rail {
  width: 1px;
  height: 100%;
  background: linear-gradient(to top, var(--color-border), var(--color-border-subtle));
  position: relative;
  margin: 0 auto;
}

.ascent-climber {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--color-accent);
  position: absolute;
  left: 50%;
  transform: translate(-50%, -50%);
  top: 100%;
  box-shadow: 0 0 12px var(--color-glow), 0 0 4px var(--color-accent);
  transition: top 0.08s linear;
  z-index: 2;
}

/* Rail floor markers — positioned absolutely along the rail */
.rail-floor-marker {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--color-text-tertiary);
  position: absolute;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 1;
  transition: color 0.3s, opacity 0.3s;
  white-space: nowrap;
}

.rail-floor-marker.active {
  color: var(--color-accent);
}

.rail-floor-label {
  font-family: var(--font-mono);
  font-size: 0.55rem;
  letter-spacing: 0.08em;
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  position: absolute;
  left: 18px;
  white-space: nowrap;
  opacity: 0;
  transform: translateY(-50%) translateX(-8px);
  transition: opacity 0.3s, transform 0.3s;
  pointer-events: none;
}

.rail-floor-marker.active ~ .rail-floor-label,
.rail-floor-marker.active + .rail-floor-label {
  opacity: 1;
  transform: translateY(-50%) translateX(0);
}

/* Mobile top progress bar */
.mobile-progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-border-subtle);
  z-index: 1001;
  display: none;
}

.mobile-progress-fill {
  height: 100%;
  width: 0%;
  background-color: var(--color-accent);
  transition: width 0.06s linear;
}

/* --------------------------------------------------------------------------
   11. SECTIONS
   -------------------------------------------------------------------------- */
section {
  padding: 7rem 0;
  position: relative;
}

/* Theme-aware section variants */
.section-dark {
  background-color: var(--color-bg);
  color: var(--color-text-primary);
}

.section-light {
  background-color: var(--color-bg);
  color: var(--color-text-primary);
}

/* Subtle top divider between sections */
section + section {
  border-top: 1px solid var(--color-border-subtle);
}

/* --------------------------------------------------------------------------
   12. HERO
   -------------------------------------------------------------------------- */
.hero-section {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  position: relative;
  padding-top: 8rem;
  padding-bottom: 5rem;
  overflow: hidden;
}

/* Ambient glow behind hero for visual depth */
.hero-section::before {
  content: '';
  position: absolute;
  top: 20%;
  right: -10%;
  width: 50vw;
  height: 50vw;
  border-radius: 50%;
  background: radial-gradient(circle, var(--color-glow) 0%, transparent 70%);
  pointer-events: none;
  opacity: 0.3;
}

.hero-content {
  max-width: 880px;
  z-index: 10;
  position: relative;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 2.5rem;
  color: var(--color-accent-text);
}

/* Pulsing dot before eyebrow */
.hero-eyebrow::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-accent);
  display: inline-block;
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.7); }
}

.hero-sub {
  font-size: clamp(1.125rem, 2.5vw, 1.5rem);
  max-width: 700px;
  line-height: 1.55;
  color: var(--color-text-secondary);
}

.hero-actions {
  display: flex;
  gap: 1.25rem;
  margin-top: 3rem;
  flex-wrap: wrap;
}

/* --------------------------------------------------------------------------
   13. CAPABILITY CARDS
   -------------------------------------------------------------------------- */
.capability-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

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

.capability-card {
  background-color: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  padding: 2.5rem 2rem 2rem;
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 280px;
  transition: transform 0.4s var(--ease-out-expo),
              border-color 0.4s var(--ease-out-expo),
              box-shadow 0.4s var(--ease-out-expo);
}

/* Top accent line that draws in on hover */
.capability-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.5s var(--ease-out-expo);
}

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

.capability-card:hover::before {
  transform: scaleX(1);
}

.capability-card .card-number {
  color: var(--color-text-tertiary);
  font-size: 0.75rem;
  margin-bottom: 2rem;
}

.capability-card h3 {
  margin-bottom: 0.75rem;
  font-size: clamp(1.25rem, 2vw, 1.5rem);
}

.capability-card p {
  color: var(--color-text-tertiary);
  font-size: 0.95rem;
  line-height: 1.55;
  margin-bottom: 0;
}

/* --------------------------------------------------------------------------
   14. WORK CARDS
   -------------------------------------------------------------------------- */
.work-grid {
  display: flex;
  flex-direction: column;
  gap: 6rem;
}

.work-card {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 3.5rem;
  align-items: center;
  text-decoration: none;
  color: var(--color-text-primary);
}

.work-card:nth-child(even) {
  grid-template-columns: 1fr 1.2fr;
}

.work-card:nth-child(even) .work-image-container {
  order: 2;
}

@media (max-width: 900px) {
  .work-card,
  .work-card:nth-child(even) {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .work-card:nth-child(even) .work-image-container {
    order: 0;
  }
}

.work-image-container {
  width: 100%;
  aspect-ratio: 16/10;
  overflow: hidden;
  background-color: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  position: relative;
}

.work-image-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(ellipse at 70% 30%, var(--color-glow) 0%, transparent 60%),
              var(--color-bg-elevated);
  transition: transform 0.7s var(--ease-out-expo);
}

.work-image-placeholder svg {
  width: 40%;
  height: 40%;
  color: var(--color-text-tertiary);
  opacity: 0.4;
  transition: color 0.4s, opacity 0.4s, transform 0.7s var(--ease-out-expo);
}

/* Real image thumbnails */
.work-card-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.7s var(--ease-out-expo), filter 0.5s;
  filter: brightness(0.92) saturate(0.95);
}

.work-card:hover .work-card-img {
  transform: scale(1.04);
  filter: brightness(1) saturate(1.05);
}

.work-card:hover .work-image-placeholder {
  transform: scale(1.04);
}

.work-card:hover .work-image-placeholder svg {
  color: var(--color-accent);
  opacity: 0.7;
  transform: scale(0.9);
}

.work-info h3 {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  margin-bottom: 1rem;
}

.work-meta {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 1rem;
}

.work-link-cue {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-accent-text);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: 1.5rem;
}

.work-link-cue svg {
  width: 1rem;
  height: 1rem;
  fill: currentColor;
  transition: transform 0.3s var(--ease-out-expo);
}

.work-card:hover .work-link-cue svg {
  transform: translateX(6px);
}

/* --------------------------------------------------------------------------
   15. FLOORS / PROCESS LAYOUT (About page)
   -------------------------------------------------------------------------- */
.floors-container {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.floor-row {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 2.5rem;
  align-items: baseline;
  padding: 3rem 0;
  border-bottom: 1px solid var(--color-border-subtle);
}

.floor-row:last-child {
  border-bottom: none;
}

.floor-number {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-accent-text);
  line-height: 1;
}

.floor-content {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 3rem;
}

@media (max-width: 1024px) {
  .floor-content {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
}

@media (max-width: 640px) {
  .floor-row {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
}

/* --------------------------------------------------------------------------
   16. FOUNDERS
   -------------------------------------------------------------------------- */
.founders-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  margin-top: 4rem;
}

@media (max-width: 768px) {
  .founders-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
}

.founder-card {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.founder-image-box {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  border: 2px solid var(--color-border);
  overflow: hidden;
  background-color: var(--color-bg-elevated);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color 0.3s;
}

.founder-card:hover .founder-image-box {
  border-color: var(--color-accent);
}

.founder-image-box svg {
  width: 40px;
  height: 40px;
  color: var(--color-text-tertiary);
}

.founder-info h3 {
  font-size: 1.35rem;
  margin-bottom: 0.25rem;
}

.founder-info .caption {
  margin-bottom: 1rem;
}

.founder-info p {
  font-size: 1rem;
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   17. CONTACT FORM
   -------------------------------------------------------------------------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 5rem;
  align-items: start;
}

@media (max-width: 1024px) {
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 4rem;
  }
}

.contact-info-panel h2 {
  margin-bottom: 1.5rem;
}

.contact-details {
  margin-top: 3rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.contact-item {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.contact-email-link {
  color: var(--color-text-primary);
  text-decoration: none;
  font-size: 1.35rem;
  font-weight: 500;
  transition: color var(--duration-fast);
  display: inline-block;
}

.contact-email-link:hover {
  color: var(--color-accent-text);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
  background-color: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  padding: 2.5rem;
}

@media (max-width: 640px) {
  .contact-form {
    padding: 2rem 1.5rem;
  }
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-text-tertiary);
  letter-spacing: 0.1em;
}

.form-group input,
.form-group textarea {
  background-color: transparent;
  border: none;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-primary);
  padding: 0.875rem 0;
  font-family: var(--font-body);
  font-size: 1rem;
  width: 100%;
  transition: border-color 0.3s;
  border-radius: 0;
  -webkit-appearance: none;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--color-text-tertiary);
  opacity: 0.6;
}

.form-group input:focus,
.form-group textarea:focus {
  border-bottom-color: var(--color-accent);
  outline: none;
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

/* --------------------------------------------------------------------------
   18. CASE STUDY DETAIL PAGES
   -------------------------------------------------------------------------- */
.case-study-hero {
  min-height: 70vh;
  min-height: 70dvh;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding-top: 10rem;
  padding-bottom: 5rem;
}

.case-study-meta-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  margin-top: 3.5rem;
  border-top: 1px solid var(--color-border);
  padding-top: 2rem;
}

@media (max-width: 768px) {
  .case-study-meta-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.case-study-meta-item label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  color: var(--color-text-tertiary);
  display: block;
  margin-bottom: 0.5rem;
  text-transform: uppercase;
}

.case-study-meta-item span {
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text-primary);
}

.case-section {
  padding: 5rem 0;
  border-bottom: 1px solid var(--color-border-subtle);
}

.case-section-inner {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 4rem;
}

@media (max-width: 900px) {
  .case-section-inner {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
}

.case-section-sidebar h3 {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent-text);
  position: sticky;
  top: 7rem;
}

.case-visual-frame {
  width: 100%;
  aspect-ratio: 16/9;
  border: 1px solid var(--color-border);
  background-color: var(--color-bg-elevated);
  overflow: hidden;
  position: relative;
  margin: 2.5rem 0;
  transition: box-shadow 0.3s;
}

.case-visual-frame:hover {
  box-shadow: 0 0 40px var(--color-glow);
}

.case-visual-frame svg {
  width: 100%;
  height: 100%;
}

/* Next project link */
.next-project-link {
  display: block;
  text-align: center;
  padding: 6rem 0;
  text-decoration: none;
  color: var(--color-text-primary);
  border-top: 1px solid var(--color-border-subtle);
  transition: background-color 0.3s;
}

.next-project-link:hover {
  background-color: var(--color-bg-elevated);
}

.next-project-link span {
  display: block;
}

.next-project-link h2 {
  transition: color 0.3s;
}

.next-project-link:hover h2 {
  color: var(--color-accent-text);
}

/* --------------------------------------------------------------------------
   19. FOOTER
   -------------------------------------------------------------------------- */
footer {
  background-color: var(--color-black);
  color: var(--color-white);
  padding: 5rem 0 3rem;
  position: relative;
}

footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 1px;
  background-color: var(--color-accent);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 4rem;
  margin-bottom: 4rem;
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
}

.footer-left {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.footer-logo {
  font-family: var(--font-display);
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--color-white);
  text-decoration: none;
  letter-spacing: -0.04em;
}

.footer-logo .yellow-ii {
  color: var(--color-yellow);
}

/* Two-dot brandmark inline in footer */
.footer-brandmark {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  margin-top: 0.5rem;
}

.footer-brandmark .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.footer-brandmark .dot-yellow { background-color: var(--color-yellow); }
.footer-brandmark .dot-white { background-color: var(--color-white); }

.footer-right {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.footer-col h4 {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: #6A6A63;
  margin-bottom: 1.25rem;
  text-transform: uppercase;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.footer-col a {
  color: #B8B8B0;
  text-decoration: none;
  font-size: 0.9rem;
  transition: color var(--duration-fast);
}

.footer-col a:hover {
  color: var(--color-yellow);
}

.footer-bottom {
  border-top: 1px solid #262626;
  padding-top: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: #6A6A63;
  font-size: 0.85rem;
}

@media (max-width: 640px) {
  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    align-items: flex-start;
  }
}

/* --------------------------------------------------------------------------
   20. MOBILE NAVIGATION
   -------------------------------------------------------------------------- */
.mobile-nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text-primary);
  cursor: pointer;
  z-index: 1100;
  padding: 0.5rem;
}

.mobile-nav-toggle svg {
  width: 1.5rem;
  height: 1.5rem;
  fill: currentColor;
}

@media (max-width: 1024px) {
  .mobile-nav-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .nav-links {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    height: 100dvh;
    background-color: var(--color-bg);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 2.5rem;
    transform: translateX(100%);
    transition: transform 0.4s var(--ease-out-expo);
    z-index: 1050;
  }

  .nav-links.open {
    transform: translateX(0);
  }

  .nav-links a:not(.btn) {
    font-size: 1.25rem;
    color: var(--color-text-primary);
  }

  .ascent-rail-container {
    display: none;
  }

  .mobile-progress-bar {
    display: block;
  }
}

/* --------------------------------------------------------------------------
   21. REVEAL ANIMATIONS
   -------------------------------------------------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--duration-slow) var(--ease-out-expo),
              transform var(--duration-slow) var(--ease-out-expo);
}

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

/* Stagger delays for grid children */
.reveal-stagger > *:nth-child(1) { transition-delay: 0s; }
.reveal-stagger > *:nth-child(2) { transition-delay: 0.1s; }
.reveal-stagger > *:nth-child(3) { transition-delay: 0.2s; }
.reveal-stagger > *:nth-child(4) { transition-delay: 0.3s; }
.reveal-stagger > *:nth-child(5) { transition-delay: 0.4s; }
.reveal-stagger > *:nth-child(6) { transition-delay: 0.5s; }

.reveal-stagger > * {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s var(--ease-out-expo),
              transform 0.6s var(--ease-out-expo);
}

.reveal-stagger.active > * {
  opacity: 1;
  transform: translateY(0);
}

/* Hero-specific staggered entrance */
.hero-enter > * {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s var(--ease-out-expo),
              transform 0.7s var(--ease-out-expo);
}

.hero-enter > *:nth-child(1) { transition-delay: 0.1s; }
.hero-enter > *:nth-child(2) { transition-delay: 0.25s; }
.hero-enter > *:nth-child(3) { transition-delay: 0.4s; }
.hero-enter > *:nth-child(4) { transition-delay: 0.55s; }

.hero-enter.active > * {
  opacity: 1;
  transform: translateY(0);
}

/* --------------------------------------------------------------------------
   22. REDUCED MOTION
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .reveal,
  .reveal-stagger > *,
  .hero-enter > * {
    opacity: 1 !important;
    transform: none !important;
  }

  .ascent-climber {
    top: 0% !important;
  }

  .custom-cursor,
  .custom-cursor-follower {
    display: none !important;
  }
}