/* ================================================================
   PROTON ORI-ENERGY — Main Stylesheet (v2 Dawn Edition)
   Design System: Pearl White × Dawn Gold × Eco Cyan × PKU Red
   Visual Direction: Bright, Light, Airy — From Deep Space to Dawn
   ================================================================ */

/* ─── RESET & BASE ─── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
  font-family: 'Inter', sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  overflow-x: hidden;
  line-height: 1.6;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; border: none; background: none; font: inherit; }

/* ─── DESIGN TOKENS ─── */
:root {
  /* Core palette — Pearl White as base */
  --color-pearl:         #FFFFFF;
  --color-pearl-warm:    #FAFAFA;
  --color-pearl-soft:    #F3F4F6;
  --color-pearl-muted:   #E5E7EB;
  --color-pearl-faint:   #F9FAFB;

  /* Warm grays for text */
  --color-gray-950: #111827;
  --color-gray-900: #1F2937;
  --color-gray-800: #374151;
  --color-gray-700: #4B5563;
  --color-gray-600: #6B7280;
  --color-gray-500: #9CA3AF;
  --color-gray-400: #D1D5DB;
  --color-gray-300: #E5E7EB;
  --color-gray-200: #F3F4F6;
  --color-gray-100: #F9FAFB;

  /* Dawn Gold — Sun & Hope */
  --color-gold-600: #A07520;
  --color-gold-500: #B8860B;
  --color-gold-400: #C8962C;
  --color-gold-300: #E0B048;
  --color-gold-200: #F0CB7A;
  --color-gold-100: #FDF6E3;
  --color-gold-50:  #FEFCE8;

  /* Eco Cyan / Hydrogen Blue — Life & Water */
  --color-eco-700: #0E7C7C;
  --color-eco-600: #0A9E9E;
  --color-eco-500: #00C9C8;
  --color-eco-400: #22D3CE;
  --color-eco-300: #67E8F9;
  --color-eco-200: #A5F3FC;
  --color-eco-100: #E6F9F9;
  --color-eco-50:  #F0FDFA;

  /* Sky Blue — Informational accent */
  --color-sky-600: #2563EB;
  --color-sky-500: #3B82F6;
  --color-sky-400: #60A5FA;
  --color-sky-100: #DBEAFE;

  /* PKU Red — Trust & Authority */
  --color-pku-red:    #9B1B2A;
  --color-pku-red-lt: #C72B3C;
  --color-pku-red-100: #FEF2F2;
  --color-pku-red-50:  #FFF1F2;

  /* Semantic */
  --color-bg:          var(--color-pearl-warm);
  --color-bg-alt:      var(--color-pearl-soft);
  --color-bg-warm:     var(--color-pearl-faint);
  --color-text:        var(--color-gray-900);
  --color-text-muted:  var(--color-gray-700);
  --color-text-subtle: var(--color-gray-600);
  --color-heading:     var(--color-gray-950);
  --color-border:      var(--color-pearl-muted);
  --color-border-subtle: var(--color-gray-400);
  --color-accent:      var(--color-eco-500);
  --color-accent-cyan: var(--color-eco-500);

  /* Hero — Dawn gradient */
  --hero-bg:    linear-gradient(180deg, #FFFFFF 0%, #FAFAFA 40%, #F3F4F6 100%);
  --hero-text:  var(--color-gray-950);

  /* Shadow system — soft, diffused, border-less */
  --shadow-xs:  0 1px 2px rgba(0,0,0,0.03);
  --shadow-sm:  0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.02);
  --shadow-md:  0 4px 16px rgba(0,0,0,0.06), 0 2px 4px rgba(0,0,0,0.03);
  --shadow-lg:  0 12px 32px rgba(0,0,0,0.08), 0 4px 8px rgba(0,0,0,0.03);
  --shadow-xl:  0 20px 48px rgba(0,0,0,0.10), 0 8px 16px rgba(0,0,0,0.04);
  --shadow-glow-cyan:  0 8px 32px rgba(0,201,200,0.12), 0 2px 8px rgba(0,201,200,0.06);
  --shadow-glow-gold:  0 8px 32px rgba(200,150,44,0.12), 0 2px 8px rgba(200,150,44,0.06);

  /* Typography scale */
  --text-xs:   0.75rem;
  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-lg:   1.125rem;
  --text-xl:   1.25rem;
  --text-2xl:  1.5rem;
  --text-3xl:  1.875rem;
  --text-4xl:  2.25rem;
  --text-5xl:  3rem;
  --text-6xl:  3.75rem;
  --text-7xl:  4.5rem;

  /* Spacing */
  --space-section: 6rem;
  --space-section-sm: 4rem;

  /* Radius */
  --radius-sm:  6px;
  --radius-md:  10px;
  --radius-lg:  14px;
  --radius-xl:  20px;

  /* Transitions */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --duration-fast: 180ms;
  --duration-med:  350ms;
  --duration-slow: 600ms;
}

/* ─── TYPOGRAPHY ─── */
h1, h2, h3, h4 {
  font-family: 'DM Serif Display', Georgia, serif;
  color: var(--color-heading);
  line-height: 1.15;
  letter-spacing: -0.02em;
}
h1 { font-size: clamp(2.5rem, 5.5vw, var(--text-7xl)); }
h2 { font-size: clamp(2rem, 3.5vw, var(--text-5xl)); }
h3 { font-size: clamp(1.25rem, 2vw, var(--text-2xl)); }
h4 { font-size: var(--text-xl); }
p  { color: var(--color-text); }

.font-mono { font-family: 'JetBrains Mono', monospace; }

/* ─── LAYOUT ─── */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}
.section {
  padding: var(--space-section) 0;
}

/* ─── SITE HEADER / NAV (Light Glassmorphism) ─── */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 200;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px) saturate(1.3);
  -webkit-backdrop-filter: blur(12px) saturate(1.3);
  transition: background var(--duration-med) var(--ease-out),
              backdrop-filter var(--duration-med) var(--ease-out),
              box-shadow var(--duration-med) var(--ease-out);
  /* 强制 GPU 合成层，防止 Safari 快速滚动时 canvas/hero 图穿透 fixed 导航 */
  transform: translateZ(0);
  will-change: background, backdrop-filter;
}
.site-header.scrolled {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(20px) saturate(1.5);
  -webkit-backdrop-filter: blur(20px) saturate(1.5);
  box-shadow: 0 1px 3px rgba(0,0,0,0.05), 0 8px 24px rgba(0,0,0,0.04);
}
.nav-container {
  display: flex;
  align-items: center;
  gap: 2.5rem;
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.25rem 2rem;
}
.logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-shrink: 0;
}
.logo-img {
  height: 60px;
  width: auto;
  display: block;
  flex-shrink: 0;
}
.logo-mark {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--color-eco-500);
  background: rgba(0, 201, 200, 0.08);
  border: 1px solid rgba(0, 201, 200, 0.25);
  padding: 0.35rem 0.55rem;
  border-radius: var(--radius-sm);
  line-height: 1;
}
.logo-text {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-gray-950);
  line-height: 1.3;
  letter-spacing: 0.01em;
}
.logo-text em { font-style: normal; color: var(--color-gray-600); font-size: 0.78rem; }
.primary-nav {
  display: flex;
  align-items: center;
  gap: 2rem;
  margin-left: auto;
}
.primary-nav a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-gray-700);
  letter-spacing: 0.02em;
  transition: color var(--duration-fast);
  position: relative;
}
.primary-nav a::after {
  content: '';
  position: absolute;
  bottom: -3px; left: 0; right: 0;
  height: 1.5px;
  background: var(--color-eco-500);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--duration-med) var(--ease-out);
}
.primary-nav a:hover { color: var(--color-eco-500); }
.primary-nav a:hover::after { transform: scaleX(1); }
.primary-nav a.active { color: var(--color-eco-600); }
.primary-nav a.active::after { transform: scaleX(1); }

.nav-cta {
  font-size: var(--text-sm);
  font-weight: 500;
  color: #FFFFFF;
  background: var(--color-eco-500);
  padding: 0.55rem 1.25rem;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  transition: background var(--duration-fast), transform var(--duration-fast), box-shadow var(--duration-fast);
  letter-spacing: 0.02em;
}
.nav-cta:hover { background: var(--color-eco-400); transform: translateY(-1px); box-shadow: var(--shadow-glow-cyan); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 0.5rem;
  margin-left: auto;
}
.nav-toggle span {
  display: block;
  width: 22px; height: 1.5px;
  background: var(--color-gray-700);
  transition: all var(--duration-fast);
}

.nav-mobile {
  display: none;
  flex-direction: column;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px) saturate(1.5);
  -webkit-backdrop-filter: blur(20px) saturate(1.5);
  border-top: 1px solid var(--color-gray-300);
  padding: 1rem 2rem 1.5rem;
  gap: 0.25rem;
}
.nav-mobile a {
  color: var(--color-gray-900);
  font-size: var(--text-base);
  font-weight: 500;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--color-gray-200);
}
.nav-mobile .mobile-cta {
  margin-top: 1rem;
  color: var(--color-eco-500);
  border: none;
}

/* ─── BUTTONS ─── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.03em;
  padding: 0.8rem 1.75rem;
  border-radius: var(--radius-sm);
  transition: all var(--duration-med) var(--ease-out);
  white-space: nowrap;
}
.btn--primary {
  background: var(--color-eco-500);
  color: #fff;
}
.btn--primary:hover {
  background: var(--color-eco-400);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow-cyan);
}
.btn--ghost {
  background: rgba(255,255,255,0.8);
  color: var(--color-gray-800);
  border: 1px solid var(--color-gray-400);
}
.btn--ghost:hover {
  background: #fff;
  color: var(--color-gray-950);
  border-color: var(--color-gray-500);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.btn--outlined {
  background: transparent;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
}
.btn--outlined:hover {
  background: var(--color-accent);
  color: #fff;
  transform: translateY(-2px);
}
.btn--dark {
  background: var(--color-gray-900);
  color: #fff;
  border: 1px solid transparent;
}
.btn--dark:hover {
  background: var(--color-gray-800);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* ─── TAGS ─── */
.tag {
  display: inline-flex;
  align-items: center;
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.3rem 0.7rem;
  border-radius: var(--radius-sm);
}
.tag--mono {
  font-family: 'JetBrains Mono', monospace;
  background: rgba(0, 201, 200, 0.08);
  color: var(--color-eco-600);
  border: 1px solid rgba(0, 201, 200, 0.2);
}
.tag--outline {
  background: rgba(0,0,0,0.03);
  color: var(--color-gray-700);
  border: 1px solid var(--color-gray-400);
}
.tag--blue {
  background: rgba(37, 99, 235, 0.08);
  color: var(--color-sky-600);
  border: 1px solid rgba(37, 99, 235, 0.2);
}
.tag--gold {
  background: rgba(200, 150, 44, 0.08);
  color: var(--color-gold-500);
  border: 1px solid rgba(200, 150, 44, 0.2);
}
.tag--red {
  background: rgba(155, 27, 42, 0.06);
  color: var(--color-pku-red);
  border: 1px solid rgba(155, 27, 42, 0.15);
}

/* ─── SECTION HEADER ─── */
.section-label {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-eco-500);
  margin-bottom: 1rem;
}
.section-title {
  margin-bottom: 1.25rem;
  color: var(--color-heading);
}
.section-desc {
  color: var(--color-gray-700);
  font-size: var(--text-lg);
  max-width: 56ch;
  line-height: 1.7;
}
.section-header {
  margin-bottom: 3.5rem;
}
.section-header--center {
  text-align: center;
}
.section-header--center .section-label,
.section-header--center .section-desc {
  display: block;
  margin-left: auto;
  margin-right: auto;
}
.section-cta-row {
  margin-top: 2.5rem;
  display: flex;
  justify-content: center;
}

/* ────────────────────────────────────────────────
   HERO — Dawn Edition
   ──────────────────────────────────────────────── */
.hero {
  position: relative;
  min-height: 70svh;
  display: flex;
  align-items: center;
  background: transparent;
  overflow: hidden;
  padding-top: 5rem;
}
.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
/* 主页 Hero — 统一分层（从底到顶）：视频 → 白遮罩30% → 渐变 → 网格 → 黑遮罩20% → 内容 */
.hero-video-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
}
.hero-video-bg video {
  position: absolute;
  top: 50%; left: 50%;
  min-width: 100%; min-height: 100%;
  width: auto; height: auto;
  transform: translate(-50%, -50%);
  object-fit: cover;
  z-index: 0;
}
.hero-img { display: none; } /* 视频模式下隐藏背景图 */
.hero-black-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.20);
  z-index: 3;
}
.hero-white-overlay {
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.30);
  z-index: 1;
}
.hero-gradient {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 70% 50% at 70% 15%, rgba(200,150,44,0.10) 0%, transparent 70%),
    radial-gradient(ellipse 50% 40% at 10% 80%, rgba(0,201,200,0.06) 0%, transparent 60%),
    radial-gradient(ellipse 40% 30% at 90% 70%, rgba(0,201,200,0.04) 0%, transparent 50%);
  z-index: 2;
}
/* Hero 背景图片层 */
.hero-img {
  position: absolute;
  inset: 0;
  background: url('../assets/hero/hero-bg.jpg') center/cover no-repeat;
  z-index: 0;
}
.hero-grid-overlay {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,0,0,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,0,0,0.025) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: linear-gradient(to bottom, transparent 0%, black 20%, black 70%, transparent 100%);
  z-index: 3;
}
.hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%; height: 100%;
  opacity: 0.15;
  z-index: 4;
}
.hero-content {
  position: relative;
  z-index: 10;
  padding-top: 3rem;
  padding-bottom: 8rem;
}
.hero-eyebrow {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}
.hero-headline {
  font-family: 'DM Serif Display', Georgia, serif;
  font-size: clamp(2.4rem, 5vw, 4.2rem);
  line-height: 1.12;
  letter-spacing: -0.03em;
  color: #FFFFFF;
  text-shadow: 0 2px 16px rgba(0,0,0,0.4);
  margin-bottom: 1.75rem;
  max-width: 20ch;
}
.hero-headline em {
  font-style: italic;
  color: #FFFFFF;
  -webkit-text-fill-color: #FFFFFF;
}
.hero-subhead {
  font-size: clamp(1rem, 1.5vw, 1.2rem);
  color: rgba(255, 255, 255, 0.85);
  text-shadow: 0 1px 8px rgba(0,0,0,0.3);
  line-height: 1.7;
  max-width: 58ch;
  margin-bottom: 2.5rem;
}
.br-desk { display: inline; }
.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 4rem;
}
.hero-stats {
  display: flex;
  align-items: flex-start;
  gap: 0;
  flex-wrap: wrap;
  border: 1px solid rgba(0,0,0,0.06);
  border-radius: var(--radius-md);
  overflow: hidden;
  max-width: 760px;
  background: rgba(0,0,0,0.55);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
  border-color: rgba(255,255,255,0.12);
}
.stat {
  flex: 1;
  min-width: 110px;
  padding: 1rem 1.25rem;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.3rem;
}
.stat-value {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  font-weight: 500;
  color: #67E8F9;
  letter-spacing: -0.02em;
  word-break: break-word;
}
.stat-label {
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.7);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 500;
  word-break: break-word;
}
.stat-divider {
  width: 1px;
  align-self: stretch;
  background: rgba(255,255,255,0.15);
}
.hero-scroll-indicator {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  z-index: 10;
}
.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--color-eco-500), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}
.scroll-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.6);
}
@keyframes scrollPulse {
  0%,100% { opacity: 0.3; transform: scaleY(0.7); transform-origin: top; }
  50% { opacity: 1; transform: scaleY(1); transform-origin: top; }
}

/* ────────────────────────────────────────────────
   THE CHALLENGE
   ──────────────────────────────────────────────── */
.challenge {
  background: var(--color-bg);
}
.challenge-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  margin-bottom: 2.5rem;
}
.challenge-card {
  background: #fff;
  padding: 2.5rem 2rem;
  position: relative;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--duration-med), transform var(--duration-med);
}
.challenge-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}
.challenge-card::before {
  content: attr(data-num);
  position: absolute;
  top: 1.5rem; right: 1.75rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  color: var(--color-gray-400);
  letter-spacing: 0.06em;
}
.challenge-card__icon {
  width: 44px; height: 44px;
  color: var(--color-eco-500);
  margin-bottom: 1.5rem;
}
.challenge-card h3 {
  font-size: var(--text-xl);
  margin-bottom: 0.75rem;
}
.challenge-card p {
  font-size: var(--text-sm);
  color: var(--color-gray-700);
  line-height: 1.7;
  margin-bottom: 1.5rem;
}
.challenge-card__tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-gray-600);
  border-top: 1px solid var(--color-gray-300);
  padding-top: 1rem;
}
.challenge-callout {
  background: var(--color-pearl-soft);
  border-left: 3px solid var(--color-eco-500);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 1.5rem 2rem;
}
.challenge-callout p {
  font-family: 'Inter', sans-serif;
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--color-gray-800);
  line-height: 1.6;
}

/* ────────────────────────────────────────────────
   WHY HYDROGEN
   ──────────────────────────────────────────────── */
.why-h2 {
  background: var(--color-pearl-soft);
}
.why-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}
.why-block__title {
  font-size: clamp(1.3rem, 2vw, 1.75rem);
  margin-bottom: 1rem;
  line-height: 1.25;
}
.why-block > p, .why-intro-p {
  font-size: var(--text-base);
  color: var(--color-gray-700);
  line-height: 1.75;
  margin-bottom: 2rem;
}
.why-comparison {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
}
.why-cmp-row {
  display: grid;
  grid-template-columns: 140px 1fr 90px;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.9rem;
  font-size: var(--text-sm);
  color: var(--color-gray-700);
}
.why-cmp-row:last-of-type { margin-bottom: 0; }
.why-cmp-row--highlight {
  color: var(--color-heading);
  font-weight: 500;
}
.why-cmp-bar {
  height: 6px;
  background: var(--color-gray-300);
  border-radius: 999px;
  overflow: hidden;
}
.bar-fill {
  height: 100%;
  border-radius: 999px;
  transition: width 1s var(--ease-out);
}
.bar--li   { background: var(--color-gray-500); }
.bar--flow { background: var(--color-gray-700); }
.bar--ch2  { background: var(--color-sky-500); }
.bar--ssh2 { background: linear-gradient(90deg, var(--color-eco-500), var(--color-eco-300)); }
.why-cmp-val {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  text-align: right;
  white-space: nowrap;
}
.why-cmp-label {
  font-size: 0.72rem;
  color: var(--color-gray-600);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--color-gray-300);
}

.advantage-stack {
  display: flex;
  flex-direction: column;
  gap: 0;
  background: #fff;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}
.advantage-item {
  display: flex;
  gap: 1.25rem;
  padding: 1.5rem 1.75rem;
  border-bottom: 1px solid var(--color-gray-200);
  background: #fff;
  transition: background var(--duration-fast);
}
.advantage-item:last-child { border-bottom: none; }
.advantage-item:hover { background: var(--color-eco-50); }
.advantage-item__icon {
  width: 28px; height: 28px;
  flex-shrink: 0;
  color: var(--color-eco-500);
  margin-top: 0.1rem;
}
.advantage-item strong {
  display: block;
  font-family: 'Inter', sans-serif;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-heading);
  margin-bottom: 0.3rem;
}
.advantage-item p {
  font-size: var(--text-sm);
  color: var(--color-gray-700);
  line-height: 1.6;
  margin: 0;
}

/* ────────────────────────────────────────────────
   WHAT POE CHANGES — Light Edition
   ──────────────────────────────────────────────── */
.what-poe {
  background: var(--color-bg);
}
.what-poe .section-label { color: var(--color-eco-500); }
.what-poe .section-title { color: var(--color-heading); }
.what-poe .section-desc { color: var(--color-gray-700); }

.system-diagram {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  max-width: 860px;
  margin: 0 auto 3.5rem;
}
.sys-layer {
  display: grid;
  grid-template-columns: 3rem 1fr auto;
  align-items: center;
  gap: 1.5rem;
  width: 100%;
  padding: 1.5rem 2rem;
  background: #fff;
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xs);
  transition: all var(--duration-med) var(--ease-out);
  cursor: default;
}
.sys-layer:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-gray-400);
  transform: translateX(4px);
}
.sys-layer--haas {
  border-color: rgba(0, 201, 200, 0.3);
  background: linear-gradient(135deg, #fff, rgba(0,201,200,0.04));
}
.sys-layer--haas:hover {
  border-color: rgba(0, 201, 200, 0.5);
  box-shadow: var(--shadow-glow-cyan);
}

.sys-layer__num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--color-gray-600);
  letter-spacing: 0.08em;
  background: var(--color-gray-200);
  border: 1px solid var(--color-gray-300);
  width: 3rem; height: 3rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}
.sys-layer--haas .sys-layer__num {
  color: var(--color-eco-500);
  border-color: rgba(0,201,200,0.25);
  background: var(--color-eco-100);
}
.sys-layer__content h4 {
  font-family: 'Inter', sans-serif;
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-gray-950);
  margin-bottom: 0.25rem;
}
.sys-layer__content p {
  font-size: var(--text-sm);
  color: var(--color-gray-700);
  line-height: 1.5;
  margin: 0;
}
.sys-layer__tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-gray-600);
  background: var(--color-gray-200);
  padding: 0.3rem 0.65rem;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  border: 1px solid var(--color-gray-300);
}
.sys-layer--haas .sys-layer__tag {
  color: var(--color-eco-500);
  background: rgba(0,201,200,0.08);
  border-color: rgba(0,201,200,0.2);
}
.sys-connector {
  color: var(--color-gray-400);
  font-size: 1.5rem;
  padding: 0.25rem 0;
  text-align: center;
  width: 100%;
}

.poe-differentiators {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  max-width: 860px;
  margin: 0 auto;
}
.diff-item {
  background: #fff;
  padding: 1.5rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--duration-fast), transform var(--duration-fast);
}
.diff-item:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}
.diff-label {
  display: block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-eco-500);
  margin-bottom: 0.6rem;
}
.diff-text {
  display: block;
  font-size: var(--text-sm);
  color: var(--color-gray-700);
  line-height: 1.55;
}

/* ────────────────────────────────────────────────
   APPLICATIONS PREVIEW
   ──────────────────────────────────────────────── */
.applications-preview {
  background: var(--color-pearl-soft);
}
.app-bento {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: auto auto;
  gap: 1rem;
}
.app-card {
  position: relative;
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 2rem;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  box-shadow: var(--shadow-sm);
  transition: all var(--duration-med) var(--ease-out);
  cursor: pointer;
}
.app-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}
.app-card--lg { grid-column: span 2; }
.app-card--wide { grid-column: span 2; }
.app-card__bg {
  position: absolute;
  inset: 0;
  opacity: 0.03;
  transition: opacity var(--duration-med);
  pointer-events: none;
}
.app-card:hover .app-card__bg { opacity: 0.06; }
/* 应用场景卡片背景 — 使用真实图片 */
.app-bg--1 {
  background: url('../assets/applications/solar-farm.jpg') center/cover no-repeat;
  opacity: 0.12;
}
.app-bg--2 {
  background: url('../assets/applications/island.jpg') center/cover no-repeat;
  opacity: 0.12;
}
.app-bg--3 {
  background: url('../assets/applications/mining.jpg') center/cover no-repeat;
  opacity: 0.12;
}
.app-bg--4 {
  background: url('../assets/applications/drone.jpg') center/cover no-repeat;
  opacity: 0.12;
}
.app-bg--5 {
  background: url('../assets/applications/data-center.jpg') center/cover no-repeat;
  opacity: 0.12;
}
.app-bg--6 {
  background: url('../assets/applications/logistics.jpg') center/cover no-repeat;
  opacity: 0.12;
}

.app-card__content { position: relative; z-index: 1; flex: 1; }
.app-card__tag {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--color-eco-500);
  margin-bottom: 0.75rem;
}
.app-card h3 {
  font-size: var(--text-lg);
  line-height: 1.3;
  margin-bottom: 1rem;
  color: var(--color-heading);
}
.app-card--lg h3 { font-size: var(--text-xl); }
.app-card p {
  font-size: var(--text-sm);
  color: var(--color-gray-700);
  line-height: 1.65;
  margin-bottom: 0.5rem;
}
.app-card__challenge strong,
.app-card__advantage strong {
  color: var(--color-gray-800);
  font-weight: 600;
}
.app-card__arrow {
  position: absolute;
  bottom: 1.5rem; right: 1.75rem;
  font-size: 1.1rem;
  color: var(--color-gray-500);
  transition: all var(--duration-fast);
}
.app-card:hover .app-card__arrow {
  color: var(--color-eco-500);
  transform: translateX(4px);
}

/* ────────────────────────────────────────────────
   TRUST LAYER
   ──────────────────────────────────────────────── */
.trust-layer {
  background: var(--color-bg);
  border-top: 1px solid var(--color-gray-300);
  border-bottom: 1px solid var(--color-gray-300);
}
.trust-grid {
  display: grid;
  grid-template-columns: 1fr 1px 1fr 1px 1fr;
  gap: 0;
  align-items: start;
}
.trust-block {
  padding: 2.5rem 3rem;
}
.trust-divider {
  background: var(--color-gray-300);
  align-self: stretch;
}
.trust-block__icon {
  width: 36px; height: 36px;
  color: var(--color-eco-500);
  margin-bottom: 1.25rem;
}
.trust-block__label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-gray-600);
  margin-bottom: 0.6rem;
  display: block;
}
.trust-block h4 {
  font-size: var(--text-xl);
  margin-bottom: 0.65rem;
}
.trust-block p {
  font-size: var(--text-sm);
  color: var(--color-gray-700);
  line-height: 1.65;
}

/* ────────────────────────────────────────────────
   PARTNER PREVIEW — Light Edition
   ──────────────────────────────────────────────── */
.partner-preview {
  background: var(--color-pearl-soft);
}
.partner-preview .section-label { color: var(--color-eco-500); }
.partner-preview .section-title { color: var(--color-heading); }
.partner-preview .section-desc { color: var(--color-gray-700); }

.partner-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin-bottom: 3rem;
}
.partner-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  box-shadow: var(--shadow-sm);
  transition: all var(--duration-med) var(--ease-out);
  border: 1px solid transparent;
}
.partner-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}
.partner-card__type {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-gray-600);
  margin-bottom: 1rem;
  display: block;
}
.partner-card h4 {
  font-family: 'Inter', sans-serif;
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-gray-950);
  margin-bottom: 0.6rem;
}
.partner-card p {
  font-size: var(--text-sm);
  color: var(--color-gray-700);
  line-height: 1.65;
  margin: 0;
}
.partner-card--pku {
  border-color: rgba(155, 27, 42, 0.12);
}
.partner-card--pku:hover { border-color: rgba(155, 27, 42, 0.25); box-shadow: 0 12px 32px rgba(155,27,42,0.06); }
.partner-card--intl {
  border-color: rgba(0, 201, 200, 0.12);
}
.partner-card--intl:hover { border-color: rgba(0, 201, 200, 0.25); box-shadow: var(--shadow-glow-cyan); }
.partner-card--seeking {
  border-color: rgba(0, 201, 200, 0.12);
}
.partner-card--seeking:hover { border-color: rgba(0, 201, 200, 0.25); box-shadow: var(--shadow-glow-cyan); }

.partner-cta-block {
  background: #fff;
  border: 1px solid rgba(0,201,200,0.15);
  border-radius: var(--radius-xl);
  padding: 3rem;
  text-align: center;
  box-shadow: var(--shadow-sm);
}
.partner-cta-block h3 {
  color: var(--color-gray-950);
  font-size: var(--text-3xl);
  margin-bottom: 0.75rem;
}
.partner-cta-block p {
  color: var(--color-gray-700);
  margin-bottom: 2rem;
  font-size: var(--text-lg);
}
.partner-cta-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ────────────────────────────────────────────────
   FOOTER — Light Edition
   ──────────────────────────────────────────────── */
.site-footer {
  background: var(--color-pearl-warm);
  border-top: 1px solid var(--color-gray-300);
  padding: 4rem 0 2.5rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}
.footer-brand .logo { margin-bottom: 1rem; }
.footer-brand p {
  font-size: var(--text-sm);
  color: var(--color-gray-700);
  line-height: 1.7;
  max-width: 28ch;
}
.footer-col h5 {
  font-family: 'Inter', sans-serif;
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-gray-800);
  margin-bottom: 1.25rem;
}
.footer-col a {
  display: block;
  font-size: var(--text-sm);
  color: var(--color-gray-700);
  margin-bottom: 0.6rem;
  transition: color var(--duration-fast);
}
.footer-col a:hover { color: var(--color-eco-500); }
.footer-bottom {
  border-top: 1px solid var(--color-gray-300);
  padding-top: 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.footer-bottom p {
  font-size: var(--text-xs);
  color: var(--color-gray-600);
  flex-shrink: 0;
}

/* ── Footer 底部信息行 ── */
.footer-bottom .footer-meta {
  flex-grow: 1;
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 3rem;
}
.footer-bottom a,
.footer-bottom .footer-contact {
  font-size: var(--text-xs);
  color: var(--color-gray-500);
  text-decoration: none;
  transition: color var(--duration-fast);
  white-space: nowrap;
}
.footer-bottom a:hover,
.footer-bottom .footer-contact:hover {
  color: var(--color-eco-500);
}

/* ────────────────────────────────────────────────
   INNER PAGE COMMON
   ──────────────────────────────────────────────── */
.page-hero {
  padding: 9rem 0 5rem;
  background: transparent;
  position: relative;
  overflow: hidden;
}
.page-hero__bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 70% 30%, rgba(200,150,44,0.08) 0%, transparent 70%),
    radial-gradient(ellipse 40% 40% at 20% 70%, rgba(0,201,200,0.05) 0%, transparent 60%);
  z-index: 1;
}
.page-hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,0,0,0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,0,0,0.02) 1px, transparent 1px);
  background-size: 60px 60px;
  z-index: 2;
}
.page-hero__img {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  z-index: 0;
}
/* Page Hero 视频背景（Technology 页面使用） */
.page-hero__video {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
}
.page-hero__video video {
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
}
.page-hero__overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.50);
  z-index: 3;
}
.page-hero__content { position: relative; z-index: 4; }
/* ─── PAGE-HERO TAGS (light-on-dark) ─── */
.page-hero__eyebrow .tag {
  background: rgba(255,255,255,0.15);
  border-color: rgba(255,255,255,0.25);
  color: rgba(255,255,255,0.9);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.page-hero__eyebrow .tag--mono {
  background: rgba(0, 201, 200, 0.20);
  border-color: rgba(0, 201, 200, 0.35);
  color: #A5F3FC;
}
.page-hero__eyebrow .tag--outline {
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.20);
  color: rgba(255,255,255,0.75);
}
.page-hero__eyebrow .tag--blue {
  background: rgba(37, 99, 235, 0.20);
  border-color: rgba(37, 99, 235, 0.35);
  color: #93C5FD;
}
.page-hero__eyebrow .tag--gold {
  background: rgba(200, 150, 44, 0.20);
  border-color: rgba(200, 150, 44, 0.35);
  color: #F0CB7A;
}
.page-hero__eyebrow .tag--red {
  background: rgba(155, 27, 42, 0.25);
  border-color: rgba(155, 27, 42, 0.40);
  color: #FCA5A5;
}

.page-hero__eyebrow {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}
.page-hero__title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  color: #FFFFFF;
  text-shadow: 0 2px 16px rgba(0,0,0,0.3);
  margin-bottom: 1.25rem;
}
.page-hero__desc {
  font-size: var(--text-lg);
  color: rgba(255, 255, 255, 0.85);
  max-width: 60ch;
  line-height: 1.7;
}

/* TECHNOLOGY PAGE SPECIFICS */
.tech-spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}
.tech-spec-table th {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-gray-700);
  font-weight: 500;
  text-align: left;
  padding: 0.75rem 1.25rem;
  background: var(--color-pearl-soft);
  border-bottom: 2px solid var(--color-gray-400);
}
.tech-spec-table td {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--color-gray-300);
  color: var(--color-gray-900);
  vertical-align: top;
}
.tech-spec-table tr:last-child td { border-bottom: none; }
.tech-spec-table tr:hover td { background: var(--color-eco-50); }
.spec-highlight {
  font-family: 'JetBrains Mono', monospace;
  color: var(--color-eco-500);
  font-weight: 500;
}

.param-card-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}
.param-card {
  background: #fff;
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}
.param-card__label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-gray-600);
  margin-bottom: 0.5rem;
  display: block;
}
.param-card__value {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--color-eco-500);
  letter-spacing: -0.03em;
  line-height: 1.2;
}
.param-card__unit {
  font-size: 0.8rem;
  color: var(--color-gray-600);
  font-weight: 400;
}
.param-card__note {
  font-size: var(--text-xs);
  color: var(--color-gray-700);
  margin-top: 0.5rem;
  line-height: 1.5;
}

/* APPLICATIONS PAGE SPECIFICS */
.app-scenario {
  padding: 4rem 0;
  border-bottom: 1px solid var(--color-gray-300);
}
.app-scenario:last-child { border-bottom: none; }
.app-scenario-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}
.app-scenario-layout--reverse .app-scenario-info { order: 2; }
.app-scenario-layout--reverse .app-scenario-visual { order: 1; }
.app-scenario__tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-eco-500);
  margin-bottom: 1rem;
  display: block;
}
.app-scenario h2 {
  font-size: clamp(1.5rem, 2.5vw, 2.25rem);
  margin-bottom: 1rem;
}
.app-scenario__challenge {
  background: var(--color-gold-50);
  border-left: 3px solid var(--color-gold-400);
  padding: 1rem 1.25rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-bottom: 1rem;
}
.app-scenario__advantage {
  background: var(--color-eco-50);
  border-left: 3px solid var(--color-eco-500);
  padding: 1rem 1.25rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-bottom: 1.5rem;
}
.app-scenario__challenge p,
.app-scenario__advantage p {
  font-size: var(--text-sm);
  line-height: 1.65;
  margin: 0;
  color: var(--color-gray-700);
}
.app-scenario__challenge strong,
.app-scenario__advantage strong {
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-family: 'JetBrains Mono', monospace;
  display: block;
  margin-bottom: 0.35rem;
}
.app-scenario__challenge strong { color: var(--color-gold-500); }
.app-scenario__advantage strong { color: var(--color-eco-500); }
.app-scenario-visual {
  background: var(--color-pearl-soft);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  aspect-ratio: 4/3;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}
.app-scenario-visual svg {
  width: 80%;
  max-width: 320px;
  opacity: 0.7;
}

.scenario-image {
  width: 100%;
  height: 100%;
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
}

.scenario-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.scenario-image__overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 1rem;
  background: linear-gradient(transparent, rgba(0,0,0,0.6));
  color: #fff;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--text-sm);
  font-weight: 500;
}

/* PARTNER PAGE SPECIFICS */
.partner-tier {
  margin-bottom: 4rem;
}
.partner-tier h3 {
  font-size: var(--text-2xl);
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--color-gray-400);
}
.partner-cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}
.partner-profile-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  transition: all var(--duration-med);
}
.partner-profile-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}
.partner-profile-card__category {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-gray-600);
  margin-bottom: 1rem;
  display: block;
}
.partner-profile-card h4 {
  font-size: var(--text-lg);
  margin-bottom: 0.5rem;
  line-height: 1.3;
}
.partner-profile-card p {
  font-size: var(--text-sm);
  color: var(--color-gray-700);
  line-height: 1.65;
  margin: 0;
}

.contact-form-section {
  background: var(--color-pearl-soft);
  padding: var(--space-section) 0;
}
.contact-form-section .section-title { color: var(--color-heading); }
.contact-form-section .section-desc { color: var(--color-gray-700); }
.contact-form {
  max-width: 600px;
  margin: 0 auto;
  background: #fff;
  border-radius: var(--radius-xl);
  padding: 2.5rem;
  box-shadow: var(--shadow-md);
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 1.25rem;
}
.form-group label {
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-gray-700);
  font-family: 'JetBrains Mono', monospace;
}
.form-group input,
.form-group select,
.form-group textarea {
  background: var(--color-pearl-soft);
  border: 1px solid var(--color-gray-400);
  color: var(--color-gray-950);
  font-size: var(--text-sm);
  font-family: 'Inter', sans-serif;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color var(--duration-fast), box-shadow var(--duration-fast);
  width: 100%;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--color-eco-500);
  box-shadow: 0 0 0 3px rgba(0, 201, 200, 0.1);
}
.form-group select option { background: #fff; }
.form-group textarea { resize: vertical; min-height: 120px; }
.form-submit {
  width: 100%;
  padding: 0.9rem;
  background: var(--color-eco-500);
  color: #fff;
  font-weight: 600;
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--duration-fast);
}
.form-submit:hover {
  background: var(--color-eco-400);
  transform: translateY(-1px);
  box-shadow: var(--shadow-glow-cyan);
}

/* ────────────────────────────────────────────────
   SCROLL ANIMATIONS
   ──────────────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
}
.reveal.visible {
  opacity: 1;
  transform: none;
}
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ────────────────────────────────────────────────
   RESPONSIVE
   ──────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .challenge-grid { grid-template-columns: 1fr; }
  .why-layout { grid-template-columns: 1fr; gap: 2.5rem; }
  .poe-differentiators { grid-template-columns: repeat(2, 1fr); }
  .app-bento {
    grid-template-columns: 1fr 1fr;
  }
  .app-card--lg { grid-column: span 2; }
  .app-card--wide { grid-column: span 2; }
  .trust-grid { grid-template-columns: 1fr; }
  .trust-divider { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .param-card-grid { grid-template-columns: repeat(2, 1fr); }
  .partner-cards-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  :root { --space-section: 4rem; }
  .primary-nav, .nav-cta { display: none; }
  .nav-toggle { display: flex; }
  .nav-mobile.open { display: flex; }
  .hero-headline {
    font-size: clamp(2.2rem, 8vw, 3.5rem);
    max-width: none;
  }
  .br-desk { display: none; }
  .app-bento { grid-template-columns: 1fr; }
  .app-card--lg, .app-card--wide { grid-column: span 1; }
  .partner-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .poe-differentiators { grid-template-columns: 1fr; }
  .sys-layer { grid-template-columns: 2.5rem 1fr; }
  .sys-layer__tag { display: none; }
  .app-scenario-layout { grid-template-columns: 1fr; }
  .app-scenario-layout--reverse .app-scenario-info { order: unset; }
  .app-scenario-layout--reverse .app-scenario-visual { order: unset; }
  .partner-cards-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .hero-stats { flex-direction: column; }
  .stat-divider { width: auto; height: 1px; }
}