/* ==========================================================================
   算花AI — 霓虹微光 Neon Shimmer Design System
   Aesthetic: Dark tech / subtle neon glow / atmospheric light bleed
   Matches editorai desktop app visual identity
   ========================================================================== */

:root {
  /* ── Brand color palette (matches editor 10-color system) ── */
  --玄黑: #050505;
  --云母: #B0B0C0;
  --碧青: #00F0FF;
  --群青: #2E2E99;
  --钴蓝: #2E5BFF;
  --晶紫: #BC13FE;
  --明黄: #FFE600;
  --琥珀: #FF9E00;
  --曙红: #FF884D;
  --石绿: #39FF14;
  --洋红: #FF0055;

  /* ── Dark foundations (nurotrain warm gradient base) ── */
  --bg-void: #150816;
  --bg-deep: #0e0a1a;
  --bg-primary: #1a1230;
  --bg-secondary: #13233a;
  --bg-tertiary: #1a2d45;
  --bg-elevated: #1f3550;
  --bg-card-start: #13233a;
  --bg-card-end: #0f1e33;

  /* ── Text hierarchy ── */
  --text-primary: #e3e3e3;
  --text-secondary: #b6d0e6;
  --text-tertiary: #6a7d90;
  --text-heading: #ffffff;

  /* ── Neon glow tokens (strengthened for visible 微光) ── */
  --glow-cyan: rgba(0, 240, 255, 0.3);
  --glow-cyan-soft: rgba(0, 240, 255, 0.12);
  --glow-cyan-strong: rgba(0, 240, 255, 0.55);
  --glow-purple: rgba(188, 19, 254, 0.2);
  --glow-magenta: rgba(255, 0, 85, 0.15);

  /* ── Per-card neon color variants ── */
  --card-glow-1: var(--碧青);
  --card-glow-2: var(--钴蓝);
  --card-glow-3: var(--晶紫);
  --card-glow-4: var(--琥珀);
  --card-glow-5: var(--碧青);

  /* ── Functional ── */
  --border-subtle: rgba(226, 232, 240, 0.12);
  --border-medium: rgba(226, 232, 240, 0.15);
  --border-glow: rgba(0, 240, 255, 0.2);

  /* ── Spacing & sizing ── */
  --nav-height: 72px;
  --max-width: 1200px;
  --section-padding: clamp(80px, 12vh, 160px);
  --content-padding: clamp(20px, 5vw, 48px);

  /* ── Typography ── */
  --font-display: 'Noto Serif SC', 'Songti SC', 'SimSun', serif;
  --font-body: -apple-system, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;

  /* ── Motion ── */
  --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-normal: 0.4s;
  --duration-slow: 0.8s;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  color: var(--text-primary);
  background: linear-gradient(135deg, #240516 0%, #022c44 100%);
  background-attachment: fixed;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

ul {
  list-style: none;
}

img, svg {
  display: block;
  max-width: 100%;
}

::selection {
  background: var(--碧青);
  color: var(--玄黑);
}

/* ==================== Grain & Atmosphere ==================== */
.grain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.025;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 256px;
}

/* ==================== Navigation ==================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(20, 8, 24, 0.75);
  backdrop-filter: blur(24px) saturate(1.4);
  -webkit-backdrop-filter: blur(24px) saturate(1.4);
  border-bottom: 1px solid var(--border-subtle);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--duration-normal) ease;
}

.navbar.scrolled {
  background: rgba(20, 8, 24, 0.92);
  border-bottom-color: var(--border-medium);
}

.navbar-inner {
  width: 100%;
  max-width: var(--max-width);
  padding: 0 var(--content-padding);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  transition: opacity var(--duration-fast) ease;
}

.navbar-brand:hover {
  opacity: 0.85;
}

.navbar-brand svg {
  width: 36px;
  height: 36px;
  filter: drop-shadow(0 0 6px rgba(0, 240, 255, 0.2));
}

.navbar-brand span {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--text-heading);
  letter-spacing: 2px;
}

.navbar-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.navbar-links a {
  font-size: 15px;
  color: var(--text-secondary);
  letter-spacing: 0.5px;
  transition: color var(--duration-fast) ease,
              text-shadow var(--duration-normal) ease;
  position: relative;
}

.navbar-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--碧青);
  box-shadow: 0 0 6px var(--glow-cyan);
  transition: width var(--duration-normal) var(--ease-out-expo);
}

.navbar-links a:hover {
  color: var(--碧青);
  text-shadow: 0 0 12px var(--glow-cyan-soft);
}

.navbar-links a:hover::after {
  width: 100%;
}

.navbar-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.navbar-toggle span {
  display: block;
  width: 24px;
  height: 1.5px;
  background: var(--text-primary);
  margin: 6px 0;
  transition: transform var(--duration-normal) var(--ease-out-expo),
              opacity var(--duration-fast) ease;
  border-radius: 1px;
}

/* ==================== Hero ==================== */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding: var(--nav-height) var(--content-padding) 60px;
  background: transparent;
}

/* ── Neon atmosphere orbs ── */
.hero-bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  will-change: transform;
}

.hero-orb--1 {
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(0, 240, 255, 0.16) 0%, rgba(0, 240, 255, 0.04) 35%, transparent 65%);
  top: -20%;
  left: 50%;
  transform: translateX(-50%);
  animation: orbFloat1 20s ease-in-out infinite;
}

.hero-orb--2 {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(188, 19, 254, 0.16) 0%, rgba(188, 19, 254, 0.04) 35%, transparent 65%);
  bottom: -8%;
  right: -8%;
  animation: orbFloat2 25s ease-in-out infinite;
}

.hero-orb--3 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(255, 0, 85, 0.12) 0%, rgba(255, 0, 85, 0.03) 35%, transparent 65%);
  top: 35%;
  left: -6%;
  animation: orbFloat3 18s ease-in-out infinite;
}

/* Warm center glow — reinforces base gradient warmth */
.hero-orb--4 {
  width: 1000px;
  height: 700px;
  background: radial-gradient(ellipse, rgba(60, 10, 40, 0.4) 0%, rgba(5, 50, 80, 0.2) 40%, transparent 65%);
  top: 10%;
  left: 50%;
  transform: translateX(-50%);
  filter: blur(80px);
  animation: orbFloat4 30s ease-in-out infinite;
}

@keyframes orbFloat4 {
  0%, 100% { opacity: 0.6; }
  50% { opacity: 0.9; }
}

@keyframes orbFloat1 {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  33% { transform: translateX(-45%) translateY(-25px); }
  66% { transform: translateX(-55%) translateY(18px); }
}

@keyframes orbFloat2 {
  0%, 100% { transform: translateY(0) scale(1); }
  50% { transform: translateY(-35px) scale(1.06); }
}

@keyframes orbFloat3 {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(25px, -30px); }
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 900px;
}

/* ── Gallery Section ── */
.gallery {
  padding: var(--section-padding) var(--content-padding);
  background: transparent;
  position: relative;
}

.gallery::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent 5%, var(--border-glow) 50%, transparent 95%);
}

.gallery-container {
  max-width: var(--max-width);
  margin: 0 auto;
}

.gallery-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
}

.gallery-item {
  position: relative;
}

.gallery-item .showcase-window {
  transform: none;
}

.gallery-item .showcase-window:hover {
  transform: translateY(-4px);
}

.gallery-caption {
  text-align: center;
  font-size: 15px;
  color: var(--text-secondary);
  letter-spacing: 1px;
  margin-top: 20px;
}

.hero-eyebrow {
  font-size: 15px;
  font-weight: 400;
  color: var(--碧青);
  letter-spacing: 6px;
  margin-bottom: 36px;
  opacity: 0.85;
  text-shadow: 0 0 20px var(--glow-cyan-soft);
}

.hero-title {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 36px;
}

.hero-title-line {
  display: block;
  font-size: clamp(48px, 9vw, 88px);
  letter-spacing: clamp(6px, 2vw, 20px);
  color: var(--text-heading);
}

/* ── Neon shimmer gradient on accent title ── */
.hero-title-line--accent {
  background: linear-gradient(135deg, var(--碧青) 0%, #66f5ff 30%, var(--晶紫) 70%, var(--洋红) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 30px var(--glow-cyan))
          drop-shadow(0 0 60px var(--glow-purple));
  animation: neonShimmer 6s ease-in-out infinite alternate;
}

@keyframes neonShimmer {
  0% {
    filter: drop-shadow(0 0 24px rgba(0, 240, 255, 0.3))
            drop-shadow(0 0 60px rgba(0, 240, 255, 0.1));
  }
  50% {
    filter: drop-shadow(0 0 40px rgba(0, 240, 255, 0.5))
            drop-shadow(0 0 80px rgba(188, 19, 254, 0.2));
  }
  100% {
    filter: drop-shadow(0 0 30px rgba(0, 240, 255, 0.35))
            drop-shadow(0 0 70px rgba(188, 19, 254, 0.15));
  }
}

.hero-subtitle {
  font-size: clamp(16px, 2.2vw, 20px);
  color: var(--text-secondary);
  letter-spacing: 3px;
  margin-bottom: 16px;
  font-weight: 400;
}

.hero-tagline {
  font-size: clamp(14px, 1.8vw, 17px);
  color: var(--text-tertiary);
  letter-spacing: 2px;
  margin-bottom: 52px;
  font-weight: 400;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
  flex-wrap: wrap;
}

.hero-meta {
  font-size: 14px;
  color: var(--text-tertiary);
  letter-spacing: 0.5px;
}

/* ── Primary Button with neon glow ── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--碧青);
  color: var(--玄黑);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 700;
  padding: 16px 40px;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  letter-spacing: 1px;
  transition: all var(--duration-normal) var(--ease-out-expo);
  position: relative;
  overflow: hidden;
  box-shadow: 0 0 20px var(--glow-cyan),
              0 0 60px rgba(0, 240, 255, 0.08);
}

.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 0%, rgba(255,255,255,0.2) 50%, transparent 100%);
  opacity: 0;
  transition: opacity var(--duration-fast) ease;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px var(--glow-cyan-strong),
              0 0 80px var(--glow-cyan),
              0 4px 20px rgba(0, 0, 0, 0.3);
}

.btn-primary:hover::before {
  opacity: 1;
}

.btn-primary--large {
  padding: 18px 52px;
  font-size: 17px;
}

/* ── Secondary Button (outlined cyan) ── */
.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(0, 240, 255, 0.06);
  color: var(--碧青);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 700;
  padding: 14px 38px;
  border-radius: 8px;
  border: 1.5px solid var(--碧青);
  cursor: pointer;
  letter-spacing: 1px;
  transition: background var(--duration-fast) ease,
              color var(--duration-fast) ease,
              transform var(--duration-normal) var(--ease-out-expo),
              box-shadow var(--duration-normal) var(--ease-out-expo);
  box-shadow: 0 0 12px rgba(0, 240, 255, 0.12);
}

.btn-secondary:hover {
  background: var(--碧青);
  color: var(--玄黑);
  transform: translateY(-2px);
  box-shadow: 0 0 24px var(--glow-cyan),
              0 4px 18px rgba(0, 0, 0, 0.3);
}

.btn-secondary--large {
  padding: 16px 50px;
  font-size: 17px;
}

/* ── Scroll hint ── */
.hero-scroll-hint {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
}

.hero-scroll-line {
  width: 1px;
  height: 52px;
  background: linear-gradient(to bottom, var(--碧青), transparent);
  animation: scrollPulse 2.5s ease-in-out infinite;
  box-shadow: 0 0 8px var(--glow-cyan-soft);
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.2; transform: scaleY(0.5); transform-origin: top; }
  50% { opacity: 0.7; transform: scaleY(1); transform-origin: top; }
}

/* ==================== Section Common ==================== */
.section-header {
  text-align: center;
  margin-bottom: clamp(48px, 8vh, 80px);
}

.section-label {
  display: inline-block;
  font-size: 13px;
  font-weight: 500;
  color: var(--碧青);
  letter-spacing: 4px;
  margin-bottom: 24px;
  padding: 7px 24px;
  border: 1px solid var(--border-glow);
  border-radius: 60px;
  text-shadow: 0 0 10px var(--glow-cyan-soft);
  box-shadow: 0 0 12px rgba(0, 240, 255, 0.04);
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 700;
  color: var(--text-heading);
  line-height: 1.3;
  letter-spacing: 3px;
}

.section-title-sub {
  font-size: clamp(18px, 2.5vw, 24px);
  font-weight: 400;
  color: var(--text-secondary);
  letter-spacing: 2px;
}

/* ==================== Philosophy ==================== */
.philosophy {
  padding: var(--section-padding) var(--content-padding);
  background: transparent;
  position: relative;
}

.philosophy::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent 5%, var(--border-glow) 50%, transparent 95%);
}

.philosophy-container {
  max-width: var(--max-width);
  margin: 0 auto;
}

.philosophy-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.philosophy-card {
  background: linear-gradient(180deg, #13233a, #0f1e33);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 16px;
  padding: 48px 32px;
  text-align: center;
  transition: all var(--duration-normal) var(--ease-out-expo);
  position: relative;
  overflow: hidden;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.45),
              0 0 0 1px rgba(255, 255, 255, 0.04) inset;
}

.philosophy-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 25%;
  right: 25%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--碧青), transparent);
  box-shadow: 0 0 10px var(--glow-cyan);
  opacity: 0;
  transition: opacity var(--duration-normal) ease, left var(--duration-slow) var(--ease-out-expo), right var(--duration-slow) var(--ease-out-expo);
}

.philosophy-card:hover {
  border-color: rgba(0, 240, 255, 0.2);
  transform: translateY(-6px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.45),
              0 0 0 1px rgba(255, 255, 255, 0.06) inset,
              0 0 40px rgba(0, 240, 255, 0.06);
}

.philosophy-card:hover::before {
  opacity: 0.7;
  left: 5%;
  right: 5%;
}

/* Per-card neon colors */
.philosophy-card:nth-child(1):hover {
  border-color: rgba(0, 240, 255, 0.2);
}
.philosophy-card:nth-child(1):hover .philosophy-icon {
  color: var(--碧青);
  filter: drop-shadow(0 0 16px rgba(0, 240, 255, 0.5));
}

.philosophy-card:nth-child(2)::before {
  background: linear-gradient(90deg, transparent, var(--晶紫), transparent);
  box-shadow: 0 0 12px rgba(188, 19, 254, 0.4);
}
.philosophy-card:nth-child(2):hover {
  border-color: rgba(188, 19, 254, 0.2);
}
.philosophy-card:nth-child(2):hover .philosophy-icon {
  color: var(--晶紫);
  filter: drop-shadow(0 0 16px rgba(188, 19, 254, 0.5));
}

.philosophy-card:nth-child(3)::before {
  background: linear-gradient(90deg, transparent, var(--石绿), transparent);
  box-shadow: 0 0 12px rgba(57, 255, 20, 0.3);
}
.philosophy-card:nth-child(3):hover {
  border-color: rgba(57, 255, 20, 0.15);
}
.philosophy-card:nth-child(3):hover .philosophy-icon {
  color: var(--石绿);
  filter: drop-shadow(0 0 16px rgba(57, 255, 20, 0.45));
}

.philosophy-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 24px;
  color: var(--碧青);
  transition: transform var(--duration-normal) var(--ease-out-expo),
              filter var(--duration-normal) ease,
              color var(--duration-normal) ease;
  filter: drop-shadow(0 0 8px var(--glow-cyan-soft));
}

.philosophy-card:hover .philosophy-icon {
  transform: scale(1.15);
}

.philosophy-card h3 {
  font-family: var(--font-body);
  font-size: 22px;
  font-weight: 700;
  color: var(--text-heading);
  margin-bottom: 12px;
  letter-spacing: 2px;
}

.philosophy-card p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ==================== Scenarios ==================== */
.scenarios {
  padding: var(--section-padding) var(--content-padding);
  background: transparent;
  position: relative;
}

.scenarios::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent 5%, var(--border-glow) 50%, transparent 95%);
}

.scenarios-container {
  max-width: var(--max-width);
  margin: 0 auto;
}

.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.scenario-card {
  background: linear-gradient(180deg, #13233a, #0f1e33);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 16px;
  padding: 44px 32px;
  text-align: center;
  transition: all var(--duration-normal) var(--ease-out-expo);
  position: relative;
  overflow: hidden;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.45),
              0 0 0 1px rgba(255, 255, 255, 0.04) inset;
}

.scenario-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 20%;
  right: 20%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--碧青), transparent);
  box-shadow: 0 0 10px var(--glow-cyan);
  opacity: 0;
  transition: opacity var(--duration-normal) ease, left var(--duration-slow) var(--ease-out-expo), right var(--duration-slow) var(--ease-out-expo);
}

.scenario-card::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  right: -50%;
  height: 100%;
  background: radial-gradient(ellipse at top center, var(--glow-cyan-soft) 0%, transparent 70%);
  opacity: 0;
  transition: opacity var(--duration-slow) ease;
  pointer-events: none;
}

.scenario-card:hover {
  border-color: rgba(0, 240, 255, 0.2);
  transform: translateY(-8px);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45),
              0 0 0 1px rgba(255, 255, 255, 0.06) inset,
              0 0 50px rgba(0, 240, 255, 0.08);
}

.scenario-card:hover::before {
  opacity: 0.8;
  left: 5%;
  right: 5%;
}

.scenario-card:hover::after {
  opacity: 1;
}

/* Accent card (center) */
.scenario-card--accent {
  border-color: rgba(188, 19, 254, 0.15);
  background: linear-gradient(180deg, rgba(188, 19, 254, 0.04) 0%, #0f1e33 100%);
}

.scenario-card--accent::before {
  background: linear-gradient(90deg, transparent, var(--晶紫), transparent);
  box-shadow: 0 0 12px rgba(188, 19, 254, 0.4);
}

.scenario-card--accent::after {
  background: radial-gradient(ellipse at top center, rgba(188, 19, 254, 0.08) 0%, transparent 70%);
}

.scenario-card--accent:hover {
  border-color: rgba(188, 19, 254, 0.25);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45),
              0 0 0 1px rgba(255, 255, 255, 0.06) inset,
              0 0 50px rgba(188, 19, 254, 0.08);
}

.scenario-card--accent .scenario-icon {
  color: var(--晶紫);
  filter: drop-shadow(0 0 8px rgba(188, 19, 254, 0.2));
}

.scenario-card--accent:hover .scenario-icon {
  filter: drop-shadow(0 0 14px rgba(188, 19, 254, 0.5));
}

/* Per-card neon: card 3 */
.scenario-card:nth-child(3)::before {
  background: linear-gradient(90deg, transparent, var(--琥珀), transparent);
  box-shadow: 0 0 12px rgba(255, 158, 0, 0.4);
}
.scenario-card:nth-child(3):hover {
  border-color: rgba(255, 158, 0, 0.2);
}
.scenario-card:nth-child(3) .scenario-icon {
  color: var(--琥珀);
  filter: drop-shadow(0 0 8px rgba(255, 158, 0, 0.2));
}
.scenario-card:nth-child(3):hover .scenario-icon {
  filter: drop-shadow(0 0 14px rgba(255, 158, 0, 0.5));
}

.scenario-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 20px;
  color: var(--碧青);
  transition: transform var(--duration-normal) var(--ease-out-expo),
              filter var(--duration-normal) ease;
  filter: drop-shadow(0 0 8px var(--glow-cyan-soft));
}

.scenario-card:hover .scenario-icon {
  transform: scale(1.12);
}

.scenario-card h3 {
  font-family: var(--font-body);
  font-size: 22px;
  font-weight: 700;
  color: var(--text-heading);
  margin-bottom: 8px;
  letter-spacing: 2px;
}

.scenario-desc {
  font-size: 14px;
  color: var(--text-tertiary);
  margin-bottom: 20px;
  letter-spacing: 1px;
}

.scenario-list {
  list-style: none;
  padding: 0;
  text-align: left;
}

.scenario-list li {
  font-size: 15px;
  color: var(--text-secondary);
  padding: 8px 0;
  border-bottom: 1px solid var(--border-subtle);
  position: relative;
  padding-left: 20px;
  line-height: 1.6;
}

.scenario-list li:last-child {
  border-bottom: none;
}

.scenario-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--碧青);
  box-shadow: 0 0 6px var(--glow-cyan-soft);
}

.scenario-card--accent .scenario-list li::before {
  background: var(--晶紫);
  box-shadow: 0 0 6px rgba(188, 19, 254, 0.3);
}

.scenario-card:nth-child(3) .scenario-list li::before {
  background: var(--琥珀);
  box-shadow: 0 0 6px rgba(255, 158, 0, 0.3);
}

/* ==================== Features ==================== */
.features {
  padding: var(--section-padding) var(--content-padding);
  background: transparent;
  position: relative;
}

.features::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent 5%, var(--border-glow) 50%, transparent 95%);
}

.features-container {
  max-width: var(--max-width);
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

/* ── Feature cards with neon border glow ── */
.feature-card {
  background: linear-gradient(180deg, #13233a, #0f1e33);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 14px;
  padding: 40px 30px;
  transition: all var(--duration-normal) var(--ease-out-expo);
  position: relative;
  overflow: hidden;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.45),
              0 0 0 1px rgba(255, 255, 255, 0.06) inset;
}

/* Top edge neon line — hidden by default */
.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 20%;
  right: 20%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--碧青), transparent);
  box-shadow: 0 0 10px var(--glow-cyan);
  opacity: 0;
  transition: opacity var(--duration-normal) ease, left var(--duration-slow) var(--ease-out-expo), right var(--duration-slow) var(--ease-out-expo);
}

/* Soft neon ambient light on hover */
.feature-card::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  right: -50%;
  height: 100%;
  background: radial-gradient(ellipse at top center, var(--glow-cyan-soft) 0%, transparent 70%);
  opacity: 0;
  transition: opacity var(--duration-slow) ease;
  pointer-events: none;
}

.feature-card:hover {
  border-color: rgba(0, 240, 255, 0.25);
  transform: translateY(-6px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.45),
              0 0 0 1px rgba(255, 255, 255, 0.08) inset,
              0 0 40px rgba(0, 240, 255, 0.06);
}

.feature-card:hover::before {
  opacity: 0.7;
  left: 5%;
  right: 5%;
}

.feature-card:hover::after {
  opacity: 1;
}

/* ── Per-card neon color on hover (visual rhythm) ── */
/* Card 1 (large/AI): cyan */
.feature-card:nth-child(1)::before {
  background: linear-gradient(90deg, transparent, var(--碧青), transparent);
  box-shadow: 0 0 12px rgba(0, 240, 255, 0.4);
}
.feature-card:nth-child(1)::after {
  background: radial-gradient(ellipse at top center, rgba(0, 240, 255, 0.1) 0%, transparent 70%);
}

/* Card 2 (富文本): cobalt blue */
.feature-card:nth-child(2)::before {
  background: linear-gradient(90deg, transparent, var(--钴蓝), transparent);
  box-shadow: 0 0 12px rgba(46, 91, 255, 0.4);
}
.feature-card:nth-child(2)::after {
  background: radial-gradient(ellipse at top center, rgba(46, 91, 255, 0.1) 0%, transparent 70%);
}
.feature-card:nth-child(2):hover {
  border-color: rgba(46, 91, 255, 0.15);
}
.feature-card:nth-child(2):hover .feature-card-icon {
  color: var(--钴蓝);
  filter: drop-shadow(0 0 14px rgba(46, 91, 255, 0.4));
}

/* Card 3 (图表公式): crystal purple */
.feature-card:nth-child(3)::before {
  background: linear-gradient(90deg, transparent, var(--晶紫), transparent);
  box-shadow: 0 0 12px rgba(188, 19, 254, 0.4);
}
.feature-card:nth-child(3)::after {
  background: radial-gradient(ellipse at top center, rgba(188, 19, 254, 0.1) 0%, transparent 70%);
}
.feature-card:nth-child(3):hover {
  border-color: rgba(188, 19, 254, 0.15);
}
.feature-card:nth-child(3):hover .feature-card-icon {
  color: var(--晶紫);
  filter: drop-shadow(0 0 14px rgba(188, 19, 254, 0.4));
}

/* Card 4 (几何图形): amber */
.feature-card:nth-child(4)::before {
  background: linear-gradient(90deg, transparent, var(--琥珀), transparent);
  box-shadow: 0 0 12px rgba(255, 158, 0, 0.4);
}
.feature-card:nth-child(4)::after {
  background: radial-gradient(ellipse at top center, rgba(255, 158, 0, 0.1) 0%, transparent 70%);
}
.feature-card:nth-child(4):hover {
  border-color: rgba(255, 158, 0, 0.15);
}
.feature-card:nth-child(4):hover .feature-card-icon {
  color: var(--琥珀);
  filter: drop-shadow(0 0 14px rgba(255, 158, 0, 0.4));
}

/* Card 5 (流程图/时序图/泳道图): cobalt blue */
.feature-card:nth-child(5)::before {
  background: linear-gradient(90deg, transparent, var(--钴蓝), transparent);
  box-shadow: 0 0 12px rgba(46, 91, 255, 0.4);
}
.feature-card:nth-child(5)::after {
  background: radial-gradient(ellipse at top center, rgba(46, 91, 255, 0.1) 0%, transparent 70%);
}
.feature-card:nth-child(5):hover {
  border-color: rgba(46, 91, 255, 0.2);
}
.feature-card:nth-child(5):hover .feature-card-icon {
  color: var(--钴蓝);
  filter: drop-shadow(0 0 14px rgba(46, 91, 255, 0.45));
}

/* Card 6 (脑力训练): crystal purple */
.feature-card:nth-child(6)::before {
  background: linear-gradient(90deg, transparent, var(--晶紫), transparent);
  box-shadow: 0 0 12px rgba(188, 19, 254, 0.4);
}
.feature-card:nth-child(6)::after {
  background: radial-gradient(ellipse at top center, rgba(188, 19, 254, 0.1) 0%, transparent 70%);
}
.feature-card:nth-child(6):hover {
  border-color: rgba(188, 19, 254, 0.15);
}
.feature-card:nth-child(6):hover .feature-card-icon {
  color: var(--晶紫);
  filter: drop-shadow(0 0 14px rgba(188, 19, 254, 0.4));
}

/* Card 7 (工作区): magenta */
.feature-card:nth-child(7)::before {
  background: linear-gradient(90deg, transparent, var(--曙红), transparent);
  box-shadow: 0 0 12px rgba(255, 136, 77, 0.4);
}
.feature-card:nth-child(7)::after {
  background: radial-gradient(ellipse at top center, rgba(255, 136, 77, 0.1) 0%, transparent 70%);
}
.feature-card:nth-child(7):hover {
  border-color: rgba(255, 136, 77, 0.2);
}
.feature-card:nth-child(7):hover .feature-card-icon {
  color: var(--曙红);
  filter: drop-shadow(0 0 14px rgba(255, 136, 77, 0.45));
}

/* Card 8 (本地优先): stone green */
.feature-card:nth-child(8)::before {
  background: linear-gradient(90deg, transparent, var(--石绿), transparent);
  box-shadow: 0 0 12px rgba(57, 255, 20, 0.3);
}
.feature-card:nth-child(8)::after {
  background: radial-gradient(ellipse at top center, rgba(57, 255, 20, 0.08) 0%, transparent 70%);
}
.feature-card:nth-child(8):hover {
  border-color: rgba(57, 255, 20, 0.12);
}
.feature-card:nth-child(8):hover .feature-card-icon {
  color: var(--石绿);
  filter: drop-shadow(0 0 14px rgba(57, 255, 20, 0.35));
}

/* ── Large hero card ── */
.feature-card--large {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-rows: auto auto;
  gap: 0 28px;
  padding: 48px 40px;
  background: linear-gradient(135deg, #13233a 0%, rgba(0, 240, 255, 0.04) 60%, #0f1e33 100%);
}

.feature-card--large .feature-card-icon {
  grid-row: 1 / 3;
  align-self: center;
  width: 80px;
  height: 80px;
}

.feature-card--large h3 {
  font-size: 24px;
  margin-bottom: 10px;
}

.feature-card--large p {
  font-size: 16px;
  max-width: 640px;
}

/* ── Highlight card ── */
.feature-card--highlight {
  background: linear-gradient(135deg, rgba(0, 240, 255, 0.06) 0%, #13233a 50%, #0f1e33 100%);
  border-color: rgba(0, 240, 255, 0.18);
}

.feature-card-icon {
  width: 52px;
  height: 52px;
  color: var(--碧青);
  margin-bottom: 24px;
  transition: transform var(--duration-normal) var(--ease-out-expo),
              filter var(--duration-normal) ease;
  filter: drop-shadow(0 0 8px var(--glow-cyan-soft));
}

.feature-card:hover .feature-card-icon {
  transform: scale(1.1);
  filter: drop-shadow(0 0 14px var(--glow-cyan));
}

.feature-card h3 {
  font-family: var(--font-body);
  font-size: 20px;
  font-weight: 600;
  color: var(--text-heading);
  margin-bottom: 12px;
  letter-spacing: 1px;
}

.feature-card p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.8;
}

.feature-card-link {
  display: inline-block;
  margin-top: 12px;
  font-size: 14px;
  color: var(--accent-cyan);
  text-decoration: none;
  transition: color 0.2s;
}

.feature-card-link:hover {
  color: var(--accent-magenta);
}

/* ==================== Showcase ==================== */
.showcase-visual {
  perspective: 1200px;
}

/* ── Carousel ── */
.showcase-carousel {
  position: relative;
}

.showcase-slides {
  position: relative;
  overflow: hidden;
}

.showcase-slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transform: scale(0.98) translateY(8px);
  pointer-events: none;
  transition: opacity 1s var(--ease-out-quart),
              transform 1s var(--ease-out-expo);
  z-index: 1;
}

.showcase-slide.active {
  opacity: 1;
  transform: scale(1) translateY(0);
  pointer-events: auto;
  z-index: 2;
}

/* ── App window with neon accents ── */
.showcase-window {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 32px 100px rgba(0, 0, 0, 0.5),
              0 0 1px rgba(255, 255, 255, 0.05),
              0 0 80px rgba(0, 240, 255, 0.06),
              0 -2px 40px rgba(188, 19, 254, 0.04);
  transform: rotateX(2deg);
  transition: transform var(--duration-slow) var(--ease-out-expo),
              box-shadow var(--duration-slow) ease;
}

.showcase-window:hover {
  transform: rotateX(0deg);
  box-shadow: 0 32px 100px rgba(0, 0, 0, 0.5),
              0 0 1px rgba(255, 255, 255, 0.05),
              0 0 120px rgba(0, 240, 255, 0.1),
              0 -2px 60px rgba(188, 19, 254, 0.06);
}

.showcase-titlebar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  background: rgba(15, 26, 46, 0.85);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.showcase-dots {
  display: flex;
  gap: 7px;
}

.showcase-dots span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.showcase-dots span:nth-child(1) { background: #ff5f56; }
.showcase-dots span:nth-child(2) { background: #ffbd2e; }
.showcase-dots span:nth-child(3) { background: #27c93f; }

.showcase-titlebar-text {
  font-size: 13px;
  color: var(--text-tertiary);
  letter-spacing: 0.5px;
}

.showcase-img {
  width: 100%;
  height: auto;
  display: block;
}

/* ── Carousel navigation dots ── */
.showcase-nav {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 28px;
}

.showcase-dot {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-subtle);
  border-radius: 60px;
  padding: 8px 24px;
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-out-expo);
  color: var(--text-tertiary);
  font-family: var(--font-body);
  font-size: 14px;
  letter-spacing: 1px;
}

.showcase-dot span {
  pointer-events: none;
}

.showcase-dot:hover {
  background: rgba(0, 240, 255, 0.06);
  border-color: rgba(0, 240, 255, 0.15);
  color: var(--text-secondary);
}

.showcase-dot.active {
  background: rgba(0, 240, 255, 0.1);
  border-color: rgba(0, 240, 255, 0.3);
  color: var(--碧青);
  box-shadow: 0 0 16px rgba(0, 240, 255, 0.08);
  text-shadow: 0 0 10px var(--glow-cyan-soft);
}

.showcase-caption {
  text-align: center;
}

.showcase-caption p {
  font-size: 16px;
  color: var(--text-secondary);
  letter-spacing: 1px;
}

/* ==================== Download ==================== */
.download {
  padding: var(--section-padding) var(--content-padding);
  background: transparent;
  position: relative;
  overflow: hidden;
}

.download::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent 5%, var(--border-glow) 50%, transparent 95%);
}

.download-container {
  max-width: var(--max-width);
  margin: 0 auto;
  position: relative;
  text-align: center;
}

.download-content {
  position: relative;
  z-index: 2;
}

.download-title {
  font-family: var(--font-display);
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 700;
  color: var(--text-heading);
  line-height: 1.3;
  letter-spacing: 3px;
  margin-top: 24px;
  margin-bottom: 20px;
}

.download-desc {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: 44px;
  letter-spacing: 1px;
}

.download-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

.download-info {
  margin-top: 24px;
}

.download-info p {
  font-size: 14px;
  color: var(--text-tertiary);
  letter-spacing: 0.5px;
}

.download-info p.download-hint {
  margin-top: 8px;
  font-size: 13px;
  opacity: 0.8;
}

.download-decoration {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.download-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
}

.download-orb--1 {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(0, 240, 255, 0.1) 0%, rgba(0, 240, 255, 0.02) 40%, transparent 65%);
  top: -60%;
  right: -8%;
}

.download-orb--2 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(188, 19, 254, 0.08) 0%, rgba(188, 19, 254, 0.02) 40%, transparent 65%);
  bottom: -40%;
  left: -5%;
}

/* ==================== Footer ==================== */
.footer {
  background: transparent;
  padding: 48px var(--content-padding) 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  opacity: 0.5;
}

.footer-brand span {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 1.5px;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
}

.footer-links a {
  font-size: 14px;
  color: var(--text-tertiary);
  letter-spacing: 0.5px;
  transition: color var(--duration-fast) ease,
              text-shadow var(--duration-normal) ease;
}

.footer-links a:hover {
  color: var(--碧青);
  text-shadow: 0 0 10px var(--glow-cyan-soft);
}

.footer-legal {
  text-align: center;
  font-size: 13px;
  color: var(--text-tertiary);
  line-height: 2;
  opacity: 0.6;
}

.footer-legal a {
  color: var(--text-tertiary);
  transition: color var(--duration-fast) ease;
}

.footer-legal a:hover {
  color: var(--text-secondary);
}

.footer-sep {
  margin: 0 8px;
  opacity: 0.4;
}

/* ==================== Scroll Reveal Animations ==================== */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.9s var(--ease-out-expo),
              transform 0.9s var(--ease-out-expo);
}

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

.reveal--delay-1 { transition-delay: 0.12s; }
.reveal--delay-2 { transition-delay: 0.24s; }
.reveal--delay-3 { transition-delay: 0.36s; }
.reveal--delay-4 { transition-delay: 0.55s; }

/* ==================== Responsive ==================== */
@media (max-width: 1023px) {
  .philosophy-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .philosophy-card:last-child {
    grid-column: 1 / -1;
    max-width: 50%;
    margin: 0 auto;
  }

  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .feature-card--large {
    grid-column: 1 / -1;
  }

  .scenarios-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .scenario-card:last-child {
    grid-column: 1 / -1;
    max-width: 50%;
    margin: 0 auto;
  }

}

@media (max-width: 767px) {
  :root {
    --nav-height: 64px;
  }

  .navbar-toggle {
    display: block;
  }

  .navbar-links {
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(20, 8, 24, 0.96);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 0 var(--content-padding);
    gap: 0;
    border-bottom: 1px solid var(--border-subtle);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s var(--ease-out-expo),
                padding 0.4s var(--ease-out-expo);
  }

  .navbar-links.open {
    max-height: 400px;
    padding: 16px var(--content-padding);
  }

  .navbar-links a {
    padding: 14px 0;
    border-bottom: 1px solid var(--border-subtle);
    width: 100%;
    font-size: 16px;
  }

  .navbar-links a::after { display: none; }

  .navbar-links a:last-child { border-bottom: none; }

  .navbar-toggle.open span:nth-child(1) {
    transform: translateY(7.5px) rotate(45deg);
  }
  .navbar-toggle.open span:nth-child(2) { opacity: 0; }
  .navbar-toggle.open span:nth-child(3) {
    transform: translateY(-7.5px) rotate(-45deg);
  }

  .hero {
    min-height: 100vh;
    padding-bottom: 40px;
  }

  .hero-eyebrow {
    font-size: 13px;
    letter-spacing: 4px;
  }

  .hero-subtitle {
    letter-spacing: 1.5px;
  }

  .hero-actions {
    flex-direction: column;
    gap: 16px;
  }

  .download-actions {
    flex-direction: column;
    gap: 14px;
  }

  .btn-primary--large,
  .btn-secondary--large {
    width: 100%;
    max-width: 320px;
    justify-content: center;
  }

  .philosophy-grid {
    grid-template-columns: 1fr;
  }

  .philosophy-card:last-child {
    max-width: 100%;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .feature-card--large {
    grid-template-columns: 1fr;
    grid-template-rows: auto;
  }

  .feature-card--large .feature-card-icon {
    grid-row: auto;
    width: 52px;
    height: 52px;
  }

  .showcase-body {
    grid-template-columns: 1fr;
  }

  .scenarios-grid {
    grid-template-columns: 1fr;
  }

  .scenario-card:last-child {
    max-width: 100%;
  }

  .footer-links {
    flex-direction: column;
    gap: 10px;
    align-items: center;
  }
}

/* ==================== Legal Pages (Privacy & Terms) ==================== */
.legal {
  padding: 120px var(--content-padding) 80px;
  max-width: 800px;
  margin: 0 auto;
}

.legal h1 {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 700;
  color: var(--text-heading);
  text-align: center;
  margin-bottom: 8px;
}

.legal-date {
  text-align: center;
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 40px;
}

.legal h2 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  color: var(--text-heading);
  margin: 32px 0 12px;
}

.legal h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-heading);
  margin: 16px 0 8px;
}

.legal p {
  font-size: 15px;
  color: var(--text-secondary);
  margin-bottom: 12px;
  line-height: 1.8;
}

.legal ul {
  list-style: disc;
  padding-left: 24px;
  margin-bottom: 12px;
}

.legal li {
  font-size: 15px;
  color: var(--text-secondary);
  margin-bottom: 6px;
  line-height: 1.8;
}

.legal strong {
  color: var(--text-heading);
}

@media (max-width: 767px) {
  .legal {
    padding: 100px 20px 60px;
  }

  .legal h1 {
    font-size: 24px;
  }
}