/* ========================================
   YuVision 官网样式 v5.3
   设计语言: Pininfarina × 意大利高端汽车设计 · 轻奢 · 克制 · 高级 · 未来感
   核心: 大面积留白 · 极简文字 · 汽车级视觉 · 大图卡片 · 微交互
   ======================================== */

/* ---- RESET & VARIABLES ---- */
:root {
  --bg-primary: #f8f7f5;
  --bg-white: #ffffff;
  --bg-dark: #0a0a0a;
  --bg-darker: #050505;
  --bg-warm: #f0eeeb;
  --text-primary: #1a1a1a;
  --text-secondary: #666;
  --text-light: #999;
  --text-on-dark: #f0f0f0;
  --text-on-dark-secondary: #999;
  --accent: #c8a45c;
  --accent-rgb: 200, 164, 92;
  --border: #e8e5e0;
  --border-dark: #2a2a2a;
  --border-subtle: rgba(0,0,0,0.06);
  --nav-blur: rgba(248,247,245,0.85);
  --nav-blur-dark: rgba(10,10,10,0.85);
  --font-serif: 'Playfair Display', 'Noto Serif SC', 'PingFang SC', 'Times New Roman', Georgia, serif;
  --font-sans: 'Inter', 'PingFang SC', -apple-system, 'Helvetica Neue', Arial, sans-serif;
  --font-zgdh: 'Noto Serif SC', 'PingFang SC', sans-serif;
  --max-width: 1400px;
  --max-width-wide: 1680px;
  --section-pad: clamp(110px, 16vw, 200px);
  --radius: 6px;
  --radius-lg: 12px;
  --ease-out: cubic-bezier(0.25, 0.1, 0.25, 1);
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-elegant: cubic-bezier(0.23, 1, 0.32, 1);
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-tap-highlight-color: transparent;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection {
  background: rgba(var(--accent-rgb), 0.25);
  color: var(--text-primary);
}

/* ---- TYPOGRAPHY ---- 
   Pininfarina style: large serif headings, light body text, minimal weight */
h1, h2, h3, h4 { font-weight: 400; line-height: 1.12; }
html, body, * { font-feature-settings: "kern" 1, "liga" 1, "calt" 1; }

/* ---- NAVIGATION ---- 
   Minimalist, thin border bottom, no blur in light state */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0; z-index: 100;
  padding: 0 clamp(36px, 6vw, 64px);
  transition: background 0.6s var(--ease-smooth), backdrop-filter 0.6s var(--ease-smooth);
}

.nav.scrolled {
  background: var(--nav-blur);
  backdrop-filter: saturate(160%) blur(24px);
  -webkit-backdrop-filter: saturate(160%) blur(24px);
  box-shadow: 0 0.5px 0 var(--border-subtle);
}

.nav-inner {
  max-width: var(--max-width-wide);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  z-index: 102;
  letter-spacing: 0.08em;
}

.nav-logo-img {
  height: 30px;
  width: auto;
  transition: opacity 0.4s var(--ease-elegant);
}

.nav-logo:hover .nav-logo-img { opacity: 0.85; }

.nav-links {
  display: flex;
  list-style: none;
  gap: clamp(24px, 3.5vw, 48px);
}

.nav-links a {
  text-decoration: none;
  color: var(--text-primary);
  font-size: 0.8125rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: color 0.4s var(--ease-elegant);
  position: relative;
  padding-bottom: 2px;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent);
  transition: width 0.5s var(--ease-elegant);
}

.nav-links a:hover { color: var(--accent); }
.nav-links a:hover::after { width: 100%; }

/* Dark section nav */
body.dark-nav .nav-links a { color: var(--text-on-dark); }
body.dark-nav .nav-links a:hover { color: var(--accent); }
body.dark-nav .nav-logo-img {
  filter: brightness(0) invert(1);
  transition: filter 0.4s var(--ease-smooth);
}
body.dark-nav .nav.scrolled {
  background: var(--nav-blur-dark);
  box-shadow: 0 0.5px 0 rgba(255,255,255,0.06);
}
body.dark-nav .lang-option { color: var(--text-on-dark); }
body.dark-nav .lang-option.active { color: var(--accent); }
body.dark-nav .lang-sep { color: var(--text-on-dark-secondary); }
body.dark-nav .nav-hamburger span { background: var(--text-on-dark); }

.nav-right { display: flex; align-items: center; gap: 18px; z-index: 102; }

.lang-toggle {
  display: flex;
  align-items: center;
  gap: 2px;
  background: none;
  border: none;
  font-size: 0.8125rem;
  cursor: pointer;
  padding: 6px 10px;
  border-radius: 100px;
  transition: background 0.3s;
  font-family: var(--font-sans);
}

.lang-toggle:hover { background: rgba(var(--accent-rgb), 0.08); }

.lang-option {
  color: var(--text-secondary);
  font-weight: 400;
  transition: color 0.3s;
}

.lang-option.active {
  color: var(--accent);
  font-weight: 500;
}

.lang-sep { color: var(--text-light); }

.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-hamburger span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--text-primary);
  transition: transform 0.4s var(--ease-elegant), opacity 0.3s;
}

.nav-hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(3px, 3px); }
.nav-hamburger.active span:nth-child(2) { transform: rotate(-45deg) translate(3px, -3px); }

/* ---- MOBILE MENU ---- */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 99;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.5s var(--ease-elegant);
}

.mobile-menu.active {
  opacity: 1;
  pointer-events: auto;
}

.mobile-menu-bg {
  position: absolute;
  inset: 0;
  background: rgba(10,10,10,0.97);
  backdrop-filter: blur(40px);
  -webkit-backdrop-filter: blur(40px);
}

.mobile-menu-links {
  position: relative;
  list-style: none;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.mobile-menu-links a {
  text-decoration: none;
  color: var(--text-on-dark);
  font-size: 1.8rem;
  font-weight: 300;
  letter-spacing: 0.06em;
  transition: color 0.4s var(--ease-elegant);
}

.mobile-menu-links a:hover { color: var(--accent); }

/* ---- HERO ---- 
   Pininfarina: Full-screen hero, video banner, minimal text, pure elegance */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: var(--bg-dark);
}

/* Hero video — full screen, cinematic */
.hero-video-wrap {
  position: absolute;
  inset: 0;
  z-index: 0;
}

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

.hero-slide {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0;
  transform: scale(1.08);
  z-index: 0;
  will-change: transform, opacity;
}

.hero-slide.active {
  opacity: 1;
  transform: scale(1);
  z-index: 1;
}

/* Hero blind transition canvas */
.hero-blind-canvas {
  position: absolute;
  inset: 0;
  z-index: 5;
  pointer-events: none;
}

.hero-gradient {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse at center, rgba(10,10,10,0.1) 0%, rgba(10,10,10,0.75) 100%),
    linear-gradient(
      180deg,
      rgba(10,10,10,0.75) 0%,
      rgba(10,10,10,0.18) 35%,
      rgba(10,10,10,0.12) 55%,
      rgba(10,10,10,0.65) 100%
    );
}

.hero-particles {
  position: absolute;
  inset: 0;
  opacity: 0.2;
  z-index: 2;
}

.hero-content {
  position: relative;
  z-index: 3;
  max-width: var(--max-width-wide);
  margin: 0 auto;
  padding: 0 clamp(40px, 8vw, 80px);
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  min-height: 100dvh;
}

.hero-text { max-width: 900px; }

.hero-label {
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 32px;
  opacity: 0;
  transform: translateY(20px);
  animation: heroReveal 1s var(--ease-elegant) 0.3s forwards;
}

.hero-title {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 32px;
}

.title-line {
  font-family: var(--font-serif);
  font-size: clamp(3.2rem, 8vw, 6.5rem);
  font-weight: 600;
  color: var(--text-on-dark);
  letter-spacing: -0.02em;
  line-height: 1.05;
  opacity: 0;
  transform: translateY(40px);
  animation: heroReveal 1.2s var(--ease-elegant) 0.5s forwards;
}

.title-line:nth-child(2) {
  font-weight: 300;
  font-style: italic;
  color: var(--accent);
  animation-delay: 0.7s;
}

@keyframes heroReveal {
  from { opacity: 0; transform: translateY(40px); }
  to { opacity: 1; transform: translateY(0); }
}

.hero-subtitle {
  font-size: 1.05rem;
  color: var(--text-on-dark-secondary);
  line-height: 1.7;
  margin-bottom: 48px;
  font-weight: 300;
  letter-spacing: 0.02em;
  max-width: 640px;
  opacity: 0;
  transform: translateY(30px);
  animation: heroReveal 1s var(--ease-elegant) 0.9s forwards;
}

/* Removed CTA buttons — less clutter for Pininfarina style */
.hero-actions {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  opacity: 0;
  transform: translateY(30px);
  animation: heroReveal 1s var(--ease-elegant) 1.1s forwards;
}

.btn-primary, .btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 48px;
  padding: 0 32px;
  font-size: 0.8125rem;
  font-weight: 400;
  text-decoration: none;
  border-radius: 100px; /* pill shape */
  transition: all 0.4s var(--ease-elegant);
  letter-spacing: 0.06em;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--accent);
  color: #000;
}

.btn-primary:hover {
  background: #d4ae68;
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(var(--accent-rgb), 0.3);
}

.btn-secondary {
  background: transparent;
  color: var(--text-on-dark);
  border: 1px solid rgba(255,255,255,0.25);
}

.btn-secondary:hover {
  background: rgba(255,255,255,0.05);
  border-color: rgba(255,255,255,0.4);
}

.btn-full { width: 100%; }

/* Scroll-down indicator */
.hero-scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  color: var(--text-on-dark-secondary);
  font-size: 0.625rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  z-index: 4;
  opacity: 0;
  animation: heroReveal 1s var(--ease-elegant) 1.5s forwards;
}

.scroll-indicator {
  width: 18px;
  height: 36px;
  border: 1px solid rgba(255,255,255,0.25);
  border-radius: 9px;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 7px;
}

.scroll-dot {
  width: 2.5px;
  height: 7px;
  background: var(--accent);
  border-radius: 2px;
  animation: scrollBounce 2.5s ease infinite;
}

@keyframes scrollBounce {
  0%, 100% { transform: translateY(0); opacity: 0.8; }
  50% { transform: translateY(16px); opacity: 0.2; }
}

/* ---- SECTIONS ---- 
   Pininfarina: generous whitespace, subtle section transitions */
.section { padding: var(--section-pad) clamp(40px, 6vw, 80px); }

.section:nth-child(even) {
  background: var(--bg-white);
}

/* Dark sections */
.section.capabilities,
.section.cases,
.section.contact {
  background: var(--bg-dark);
  color: var(--text-on-dark);
}

.section-inner {
  max-width: var(--max-width-wide);
  margin: 0 auto;
}

/* Section head — minimal, elegant */
.section-head {
  margin-bottom: clamp(72px, 10vw, 130px);
}

.section-head::after {
  content: '';
  display: block;
  width: 0;
  height: 1px;
  background: var(--accent);
  margin-top: 28px;
  opacity: 0.5;
  animation: lineExpand 1.2s var(--ease-elegant) 0.6s forwards;
}

@keyframes lineExpand {
  to { width: 48px; }
}

.section-num {
  font-family: var(--font-serif);
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--text-light);
  letter-spacing: 0.15em;
  display: block;
  margin-bottom: 20px;
  text-transform: uppercase;
}

.section-num--light {
  color: rgba(255,255,255,0.5);
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(2.8rem, 6vw, 4.5rem);
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.025em;
  line-height: 1.06;
}

.section-title--light {
  color: var(--text-on-dark);
}

.section-desc {
  margin-top: 24px;
  font-size: 1.05rem;
  color: var(--text-secondary);
  font-weight: 300;
  max-width: 560px;
  line-height: 1.75;
  letter-spacing: 0.02em;
}

.section-desc--dark { color: var(--text-light); }

.capabilities .section-desc,
.cases .section-desc,
.contact .section-desc {
  color: rgba(255,255,255,0.65);
}

/* ---- ABOUT ---- */
.about-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: clamp(60px, 10vw, 150px);
  align-items: start;
}

.about-main { max-width: 640px; }

.about-name {
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 36px;
  line-height: 1.3;
  letter-spacing: -0.02em;
}

.about-text {
  font-size: 1.02rem;
  color: var(--text-secondary);
  line-height: 1.95;
  font-weight: 300;
  letter-spacing: 0.015em;
}

.about-img-wrap {
  position: relative;
}

.about-img {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 64px rgba(0,0,0,0.06);
  transition: transform 0.8s var(--ease-elegant), box-shadow 0.8s var(--ease-elegant);
}

.about-img:hover {
  transform: scale(1.02) translateY(-4px);
  box-shadow: 0 32px 80px rgba(0,0,0,0.1);
}

.about-stats {
  display: flex;
  align-items: center;
  gap: 0;
  padding-top: 14px;
  margin-top: 72px;
  padding-left: 4px;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex: 1;
  padding: 0 12px;
}

.stat-num {
  font-family: var(--font-serif);
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1;
}

.stat-num sup {
  font-size: 0.5em;
  font-weight: 400;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-light);
  margin-top: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.stat-divider {
  width: 1px;
  height: 56px;
  background: var(--border);
}

.about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(48px, 7vw, 80px);
}

.tag {
  font-size: 0.6875rem;
  font-weight: 400;
  color: var(--text-secondary);
  padding: 8px 22px;
  border: 1px solid var(--border);
  border-radius: 100px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: all 0.4s var(--ease-elegant);
}

.tag:hover {
  background: var(--bg-primary);
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

/* ---- CAPABILITIES ----
   Pininfarina style: dark, spacious, each card feels like a gallery piece */
.capabilities-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: rgba(255,255,255,0.05);
}

.cap-card {
  padding: clamp(48px, 6vw, 72px) clamp(40px, 5vw, 56px);
  background: var(--bg-dark);
  transition: background 0.5s var(--ease-elegant);
  position: relative;
  display: flex;
  flex-direction: column;
}

.cap-card:hover {
  background: rgba(255,255,255,0.03);
}

/* Top accent line — Pininfarina's signature */
.cap-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: clamp(40px, 5vw, 56px);
  width: 24px;
  height: 1.5px;
  background: var(--accent);
  opacity: 0;
  transition: all 0.6s var(--ease-elegant);
}

.cap-card:hover::before {
  opacity: 0.7;
  width: 56px;
  left: clamp(40px, 5vw, 56px);
}

.cap-num {
  font-family: var(--font-serif);
  font-size: 0.6875rem;
  color: rgba(200,164,92,0.6);
  letter-spacing: 0.15em;
  display: block;
  margin-bottom: clamp(24px, 3vw, 36px);
  transition: color 0.4s var(--ease-elegant);
}

.cap-card:hover .cap-num {
  color: var(--accent);
}

.cap-name {
  font-family: var(--font-serif);
  font-size: clamp(1.3rem, 2.2vw, 1.5rem);
  font-weight: 600;
  color: var(--text-on-dark);
  margin-bottom: 16px;
  letter-spacing: -0.015em;
  line-height: 1.35;
}

.cap-desc {
  font-size: 0.875rem;
  color: rgba(240,240,240,0.6);
  line-height: 1.8;
  font-weight: 300;
  letter-spacing: 0.02em;
}

/* ---- CLIENTS ---- 
   Logo grid with Pininfarina-class elegance */
.clients-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1px;
  background: var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.client-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: clamp(40px, 5vw, 52px) clamp(24px, 3vw, 36px);
  background: var(--bg-white);
  text-align: center;
  cursor: default;
  transition: all 0.5s var(--ease-elegant);
}

.client-item:hover {
  background: var(--bg-primary);
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0,0,0,0.06);
  z-index: 2;
}

.client-logo {
  height: 36px;
  width: auto;
  max-width: 100%;
  object-fit: contain;
  filter: grayscale(100%) brightness(0.2);
  opacity: 0.55;
  transition: all 0.5s var(--ease-elegant);
}

.client-item:hover .client-logo {
  filter: grayscale(0%) brightness(1);
  opacity: 1;
}

.client-name {
  font-size: 0.6875rem;
  color: var(--text-light);
  font-weight: 400;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: color 0.4s var(--ease-elegant);
}

.client-item:hover .client-name {
  color: var(--accent);
}

/* ---- CASES ----
   Pininfarina: Large image cards, full-bleed visuals, hover micro-interaction */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.case-card {
  background: var(--bg-dark);
  border-radius: var(--radius-lg);
  overflow: hidden;
  cursor: pointer;
  position: relative;
  transition: all 0.6s var(--ease-elegant);
}

.case-card:hover {
  transform: translateY(-12px);
  box-shadow: 0 40px 80px rgba(0,0,0,0.3);
}

.case-img-wrap {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4 / 3;
}

.case-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.8s var(--ease-elegant);
}

.case-card:hover .case-img {
  transform: scale(1.06);
}

.case-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, 
    rgba(10,10,10,0.7) 0%, 
    rgba(10,10,10,0.1) 45%,
    transparent 70%
  );
  transition: background 0.6s var(--ease-elegant);
}

.case-card:hover .case-overlay {
  background: linear-gradient(to top, 
    rgba(10,10,10,0.8) 0%, 
    rgba(10,10,10,0.2) 50%,
    transparent 75%
  );
}

/* Click arrow on hover */
.case-arrow {
  position: absolute;
  bottom: 20px;
  right: 20px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255,255,255,0.1);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: translateY(8px);
  transition: all 0.4s var(--ease-elegant);
}

.case-card:hover .case-arrow {
  opacity: 1;
  transform: translateY(0);
}

.case-arrow::before {
  content: '';
  width: 12px;
  height: 12px;
  border-right: 1.5px solid rgba(255,255,255,0.8);
  border-bottom: 1.5px solid rgba(255,255,255,0.8);
  transform: rotate(-45deg);
}

.case-info {
  padding: 32px clamp(28px, 3vw, 38px) clamp(28px, 3vw, 34px);
  position: relative;
}

.case-client {
  font-size: 0.6875rem;
  color: var(--accent);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  display: block;
  margin-bottom: 14px;
  font-weight: 400;
}

.case-title {
  font-family: var(--font-serif);
  font-size: clamp(1.4rem, 2.2vw, 1.65rem);
  font-weight: 600;
  color: var(--text-on-dark);
  margin-bottom: 14px;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.case-desc {
  font-size: 0.85rem;
  color: rgba(240,240,240,0.6);
  margin-bottom: 18px;
  font-weight: 300;
  line-height: 1.75;
  letter-spacing: 0.02em;
}

.case-tags {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.case-tags span {
  font-size: 0.625rem;
  color: rgba(255,255,255,0.5);
  padding: 5px 14px;
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 100px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  transition: all 0.4s var(--ease-elegant);
}

.case-tags span:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(var(--accent-rgb), 0.06);
}

/* ---- TECH ---- 
   Clean, organized, Pininfarina style */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 60px;
  padding-top: 20px;
}

.tech-group {
  position: relative;
}

.tech-group-title {
  font-family: var(--font-serif);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 28px;
  letter-spacing: -0.01em;
}

.tech-items {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.tech-item {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  padding: 10px 16px;
  border-radius: var(--radius);
  font-weight: 400;
  border: 1px solid transparent;
  transition: all 0.4s var(--ease-elegant);
  letter-spacing: 0.03em;
  cursor: default;
}

.tech-item:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(var(--accent-rgb), 0.04);
  transform: translateX(4px);
}

/* ---- CONTACT ---- 
   Minimal, elegant, dark container */
.contact-grid {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: clamp(56px, 8vw, 150px);
  align-items: start;
}

.contact-left {
  padding-top: 12px;
}

.contact-intro {
  font-size: 1.08rem;
  color: rgba(240,240,240,0.7);
  line-height: 1.85;
  font-weight: 300;
  margin-bottom: 56px;
  letter-spacing: 0.02em;
}

.contact-offices {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.office {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding-bottom: 24px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.office-label {
  font-size: 0.6875rem;
  color: var(--accent);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 400;
}

.office-addr {
  font-size: 1rem;
  color: var(--text-on-dark);
  font-weight: 300;
  letter-spacing: 0.02em;
}

.contact-right {
  background: rgba(255,255,255,0.03);
  border-radius: var(--radius-lg);
  padding: clamp(40px, 5vw, 60px);
  border: 1px solid rgba(255,255,255,0.08);
  backdrop-filter: blur(10px);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.form-field label {
  display: block;
  font-size: 0.6875rem;
  color: rgba(240,240,240,0.5);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 10px;
  font-weight: 400;
}

.form-field input,
.form-field textarea {
  width: 100%;
  padding: 14px 18px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius);
  color: var(--text-on-dark);
  font-size: 0.875rem;
  font-family: var(--font-sans);
  transition: all 0.4s var(--ease-elegant);
  outline: none;
}

.form-field input:hover,
.form-field textarea:hover {
  border-color: rgba(255,255,255,0.2);
  background: rgba(255,255,255,0.06);
}

.form-field input:focus,
.form-field textarea:focus {
  border-color: var(--accent);
  background: rgba(255,255,255,0.08);
  box-shadow: 0 0 0 3px rgba(var(--accent-rgb), 0.12);
}

.form-field input::placeholder,
.form-field textarea::placeholder {
  color: rgba(240,240,240,0.25);
  font-weight: 300;
}

.form-field .required {
  color: var(--accent);
  font-weight: 400;
}

/* Honeypot — hidden from humans */
.form-hp {
  position: absolute;
  left: -9999px;
  opacity: 0;
  pointer-events: none;
  width: 0;
  height: 0;
}

/* Form Feedback */
.form-feedback {
  min-height: 0;
  font-size: 0.8125rem;
  line-height: 1.4;
  transition: all 0.4s var(--ease-elegant);
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  padding: 0;
  border-radius: var(--radius);
}

.form-feedback.visible {
  max-height: 80px;
  opacity: 1;
  padding: 10px 16px;
}

.form-feedback.success {
  background: rgba(46, 125, 50, 0.15);
  border: 1px solid rgba(46, 125, 50, 0.3);
  color: #81c784;
}

.form-feedback.error {
  background: rgba(198, 40, 40, 0.12);
  border: 1px solid rgba(198, 40, 40, 0.25);
  color: #ef9a9a;
}

/* Submit Button States */
.contact-form .btn-primary {
  position: relative;
  overflow: hidden;
  transition: all 0.4s var(--ease-elegant);
}

.contact-form .btn-primary .btn-loader {
  display: none;
  animation: spin 0.8s linear infinite;
}

.contact-form .btn-primary.loading .btn-text {
  opacity: 0;
}

.contact-form .btn-primary.loading .btn-loader {
  display: flex;
  align-items: center;
  justify-content: center;
  position: absolute;
  inset: 0;
}

.contact-form .btn-primary.loading {
  pointer-events: none;
  opacity: 0.8;
}

.contact-form .btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Input validation states */
.form-field input:user-invalid,
.form-field textarea:user-invalid {
  border-color: rgba(198, 40, 40, 0.4);
}

.form-field input:user-valid:not(:placeholder-shown),
.form-field textarea:user-valid:not(:placeholder-shown) {
  border-color: rgba(46, 125, 50, 0.4);
}

.form-field textarea { resize: vertical; min-height: 110px; }

/* ---- FOOTER ---- */
.footer {
  background: var(--bg-dark);
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 64px 64px 40px;
}

.footer-inner {
  max-width: var(--max-width-wide);
  margin: 0 auto;
}

.footer-top {
  display: flex;
  align-items: center;
  gap: 32px;
  margin-bottom: 40px;
}

.footer-logo {
  height: 30px;
  width: auto;
  opacity: 0.8;
  filter: brightness(0) invert(1);
  transition: all 0.4s var(--ease-elegant);
}

.footer-logo:hover {
  opacity: 1;
}

.footer-slogan {
  font-size: 0.75rem;
  color: rgba(240,240,240,0.5);
  letter-spacing: 0.06em;
  font-weight: 300;
}

.footer-bottom {
  padding-top: 28px;
  border-top: 1px solid rgba(255,255,255,0.06);
  font-size: 0.6875rem;
  color: rgba(240,240,240,0.4);
  letter-spacing: 0.04em;
}

.footer-links {
  display: flex;
  gap: 32px;
  margin-bottom: 36px;
}

.footer-links a {
  font-size: 0.75rem;
  color: rgba(240,240,240,0.6);
  text-decoration: none;
  transition: color 0.3s;
  letter-spacing: 0.04em;
}

.footer-links a:hover {
  color: var(--accent);
}

/* ---- REVEAL ANIMATIONS ----
   Slower, more elegant for Pininfarina feel */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 1s var(--ease-elegant), transform 1s var(--ease-elegant);
}

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

.reveal.delay-1 { transition-delay: 0.18s; }
.reveal.delay-2 { transition-delay: 0.35s; }
.reveal.delay-3 { transition-delay: 0.5s; }
.reveal.delay-4 { transition-delay: 0.7s; }

/* ---- SECTION FADE LINES ---- */
.section-divider {
  width: 100%;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--border), transparent);
}

.section-divider--dark {
  background: linear-gradient(to right, transparent, rgba(255,255,255,0.08), transparent);
}

/* ---- RESPONSIVE ---- */
@media (max-width: 1024px) {
  .about-grid { grid-template-columns: 1fr; gap: 64px; }
  .about-stats { padding-left: 4px; }
  .capabilities-grid { grid-template-columns: repeat(2, 1fr); }
  .clients-grid { grid-template-columns: repeat(3, 1fr); }
  
  .tech-grid { grid-template-columns: repeat(2, 1fr); gap: 48px; }
  .contact-grid { grid-template-columns: 1fr; gap: 64px; }
  .cases-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .section { padding: 80px 36px; }
  .section-head { margin-bottom: clamp(48px, 10vw, 80px); }
  .hero-content { padding: 0 clamp(28px, 6vw, 48px); }
  .hero-text { max-width: 100%; }
  .nav { padding: 0 28px; }
  .nav-inner { height: 56px; }

  .nav-links { display: none; }
  .nav-hamburger { display: flex; }

  .about-grid { gap: 48px; }
  .about-stats { flex-wrap: wrap; padding: 0 4px; }
  .stat-label { font-size: 0.6875rem; }
  .about-tags { margin-top: 48px; }

  .capabilities-grid { grid-template-columns: 1fr; }
  .cap-card { padding: 48px 36px; }
  .cap-card::before { left: 36px; }

  .clients-grid { grid-template-columns: repeat(2, 1fr); }
  .client-item { padding: 36px 24px; }

  .cases-grid { grid-template-columns: 1fr; gap: 20px; }
  .case-img-wrap { aspect-ratio: 16 / 9; }
  .case-info { padding: 28px; }

  .contact-right { padding: 36px 28px; }

  .footer { padding: 48px 28px 32px; }
  .footer-logo { height: 28px; }

  .section-head::after { width: 36px; margin-top: 20px; }
  .section-divider { max-width: 80%; margin: 0 auto; }
}

@media (max-width: 480px) {
  .hero-title .title-line { font-size: clamp(2.6rem, 10vw, 3.4rem); }
  .hero-label { font-size: 0.6875rem; margin-bottom: 24px; }
  .hero-subtitle { font-size: 0.9375rem; margin-bottom: 40px; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn-primary,
  .hero-actions .btn-secondary { width: 100%; text-align: center; }
  .hero-scroll { bottom: 32px; font-size: 0.5625rem; }

  .section-title { font-size: clamp(2.2rem, 8vw, 2.8rem); }
  .section-desc { font-size: 0.9375rem; }

  .clients-grid { grid-template-columns: 1fr; }
  .client-item { padding: 36px 28px; }

  .tech-grid { grid-template-columns: 1fr; gap: 36px; }
  .stat-divider { height: 40px; }
  .section-head::after { width: 28px; margin-top: 16px; }
  .case-info { padding: 24px; }
}