/* =============================================================================
 * Code Abyss — Editorial Dark
 * 单色冷紫 + 衬线标题中文 + 极简玻璃 + 静默动效
 * ========================================================================== */

:root {
  /* 色板 */
  --ink-0: #07070a;
  --ink-1: #0e0e14;
  --ink-2: #15151e;
  --ink-3: #1c1c28;
  --line: rgba(255, 255, 255, 0.06);
  --line-strong: rgba(255, 255, 255, 0.12);
  --line-glow: rgba(255, 255, 255, 0.22);

  --paper: #ecedf5;
  --paper-soft: rgba(236, 237, 245, 0.62);
  --paper-mute: rgba(236, 237, 245, 0.40);
  --paper-faint: rgba(236, 237, 245, 0.18);

  --iris: #9b8cff;          /* 主色：冷紫 */
  --iris-deep: #6e5dff;
  --iris-glow: rgba(155, 140, 255, 0.32);
  --iris-bg: rgba(155, 140, 255, 0.10);
  --iris-line: rgba(155, 140, 255, 0.22);

  --moss: #8ad6b0;          /* 强调：薄荷绿（仅用于成功/代码） */
  --amber: #f0b067;         /* 强调：琥珀（仅用于警示/警告） */

  /* 字体 */
  --sans: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Segoe UI', sans-serif;
  --serif: 'Noto Serif SC', 'Source Han Serif SC', 'Songti SC', 'Times New Roman', serif;
  --mono: 'JetBrains Mono', 'SF Mono', 'Cascadia Code', ui-monospace, monospace;

  /* 节奏 */
  --step: 1.5rem;
  --radius: 14px;
  --radius-sm: 8px;
  --radius-xs: 4px;
  --radius-pill: 999px;

  /* 玻璃 */
  --glass-bg: rgba(20, 20, 28, 0.55);
  --glass-bg-hi: rgba(28, 28, 40, 0.72);
  --glass-blur: 18px;
  --glass-sat: 1.5;

  /* 动效 */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-soft: cubic-bezier(0.4, 0, 0.2, 1);
  --t-fast: 160ms;
  --t-base: 280ms;
  --t-slow: 480ms;

  /* 容器 */
  --w-narrow: 720px;
  --w-base: 1080px;
  --w-wide: 1240px;
}

/* =============================================================================
 * Reset & Base
 * ========================================================================== */

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

html { scroll-behavior: smooth; }

body {
  background: var(--ink-0);
  color: var(--paper);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  font-feature-settings: 'ss01', 'cv01', 'cv11';
}

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

code, pre, kbd { font-family: var(--mono); font-size: 0.875em; }

::selection { background: var(--iris-glow); color: var(--paper); }

/* =============================================================================
 * 背景层 — 颗粒、辉光、网格
 * ========================================================================== */

.bg-grid {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 1100px 600px at 22% -10%, rgba(155, 140, 255, 0.10), transparent 55%),
    radial-gradient(ellipse 900px 500px at 88% 15%, rgba(110, 93, 255, 0.08), transparent 60%),
    radial-gradient(ellipse 1400px 700px at 50% 110%, rgba(155, 140, 255, 0.05), transparent 55%);
}

.bg-grid::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='240' height='240'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 0 0 0 0.025 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
  opacity: 0.7;
  mix-blend-mode: overlay;
}

/* =============================================================================
 * 容器 & 段落节奏
 * ========================================================================== */

.container {
  max-width: var(--w-base);
  margin: 0 auto;
  padding: 0 32px;
  position: relative;
  z-index: 1;
}

.container.narrow { max-width: var(--w-narrow); }
.container.wide { max-width: var(--w-wide); }

section {
  padding: 120px 0;
  position: relative;
}

@media (max-width: 768px) {
  section { padding: 80px 0; }
  .container { padding: 0 20px; }
}

/* =============================================================================
 * 字体阶梯
 * ========================================================================== */

.eyebrow {
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--iris);
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
}

.eyebrow::before {
  content: '';
  width: 24px;
  height: 1px;
  background: var(--iris);
  display: block;
}

h1, h2, h3 {
  font-family: var(--serif);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.15;
  color: var(--paper);
}

h1 {
  font-size: clamp(2.6rem, 6vw, 4.4rem);
  letter-spacing: -0.035em;
  font-weight: 600;
}

h2 {
  font-size: clamp(1.8rem, 3.6vw, 2.6rem);
  margin-bottom: 14px;
}

h3 {
  font-size: 1.18rem;
  font-weight: 600;
}

.lead {
  font-size: 1.05rem;
  color: var(--paper-soft);
  max-width: 56ch;
  line-height: 1.75;
}

.section-desc {
  color: var(--paper-soft);
  font-size: 1.02rem;
  margin-bottom: 56px;
  max-width: 60ch;
}

/* =============================================================================
 * 顶栏
 * ========================================================================== */

.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(7, 7, 10, 0.72);
  -webkit-backdrop-filter: blur(20px) saturate(var(--glass-sat));
  backdrop-filter: blur(20px) saturate(var(--glass-sat));
  border-bottom: 1px solid var(--line);
}

.nav-inner {
  max-width: var(--w-wide);
  margin: 0 auto;
  padding: 0 32px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 0.92rem;
  letter-spacing: -0.01em;
  transition: opacity var(--t-fast) var(--ease);
}

.logo:hover { opacity: 0.85; }

.logo-mark {
  flex-shrink: 0;
  filter: drop-shadow(0 2px 8px var(--iris-glow));
  transition: transform var(--t-slow) var(--ease);
}

.logo:hover .logo-mark {
  transform: rotate(-12deg) scale(1.04);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-links > a {
  color: var(--paper-mute);
  font-size: 0.84rem;
  font-weight: 500;
  transition: color var(--t-fast) var(--ease);
  position: relative;
}

.nav-links > a:hover { color: var(--paper); }

.nav-gh {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  color: var(--paper-mute);
  transition: all var(--t-fast) var(--ease);
}

.nav-gh:hover {
  color: var(--paper);
  background: var(--ink-2);
}

.lang-switch {
  display: flex;
  background: var(--ink-2);
  border-radius: var(--radius-xs);
  padding: 2px;
}

.lang-switch button {
  padding: 4px 10px;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--paper-mute);
  border-radius: 3px;
  transition: all var(--t-fast) var(--ease);
}

.lang-switch button.active {
  background: var(--iris-bg);
  color: var(--iris);
}

.lang-switch button:hover:not(.active) { color: var(--paper-soft); }

@media (max-width: 640px) {
  .nav-links > a { display: none; }
}

/* =============================================================================
 * Hero
 * ========================================================================== */

.hero {
  padding: 180px 0 100px;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 60px;
  align-items: center;
}

@media (max-width: 880px) {
  .hero { padding: 130px 0 70px; }
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 12px 5px 6px;
  background: var(--iris-bg);
  border: 1px solid var(--iris-line);
  border-radius: var(--radius-pill);
  font-size: 0.74rem;
  font-weight: 600;
  color: var(--iris);
  margin-bottom: 28px;
  letter-spacing: 0.01em;
}

.hero-badge span.dot {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--iris);
  color: var(--ink-0);
  display: grid;
  place-items: center;
  font-family: var(--serif);
  font-size: 0.65rem;
  font-weight: 700;
}

.hero h1 {
  margin-bottom: 24px;
}

.hero h1 .accent {
  font-style: italic;
  font-weight: 500;
  background: linear-gradient(120deg, var(--iris) 0%, #c4b8ff 60%, var(--iris) 100%);
  background-size: 200% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: shimmer 8s linear infinite;
}

@keyframes shimmer {
  to { background-position: 200% 0; }
}

.hero .lead {
  margin-bottom: 36px;
}

.hero-install {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 10px 8px 10px 18px;
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-sat));
  backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-sat));
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  font-family: var(--mono);
  font-size: 0.86rem;
  transition: border-color var(--t-base) var(--ease);
}

.hero-install:hover { border-color: var(--line-strong); }

.prompt-sign {
  color: var(--paper-mute);
  user-select: none;
}

.hero-install code { color: var(--moss); }

.copy-btn {
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  background: var(--ink-2);
  color: var(--paper-mute);
  font-size: 0.74rem;
  font-weight: 600;
  font-family: var(--sans);
  transition: all var(--t-fast) var(--ease);
}

.copy-btn:hover {
  background: var(--iris-bg);
  color: var(--iris);
}

.copy-btn.copied {
  background: rgba(138, 214, 176, 0.12);
  color: var(--moss);
}

.hero-actions {
  display: flex;
  gap: 12px;
  margin-top: 28px;
  flex-wrap: wrap;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 22px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 600;
  letter-spacing: -0.005em;
  transition: all var(--t-fast) var(--ease);
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--paper);
  color: var(--ink-0);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(236, 237, 245, 0.18);
}

.btn-ghost {
  background: transparent;
  color: var(--paper-soft);
  border-color: var(--line-strong);
}

.btn-ghost:hover {
  color: var(--paper);
  border-color: var(--line-glow);
  background: var(--ink-2);
}

.btn-link {
  padding: 11px 0;
  color: var(--paper-mute);
}

.btn-link:hover { color: var(--paper); }

.btn-link::after {
  content: '→';
  display: inline-block;
  transition: transform var(--t-fast) var(--ease);
}

.btn-link:hover::after { transform: translateX(3px); }

/* Hero 右侧：浮动 persona 卡阵 */
.hero-stack {
  position: relative;
  min-height: 380px;
  perspective: 1200px;
}

.hero-card {
  position: absolute;
  width: 240px;
  padding: 22px 22px 20px;
  background: var(--glass-bg-hi);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-sat));
  backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-sat));
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  box-shadow:
    0 24px 60px rgba(0, 0, 0, 0.5),
    0 4px 12px rgba(0, 0, 0, 0.3),
    inset 0 1px 0 rgba(255, 255, 255, 0.06);
  font-family: var(--serif);
  transition: transform var(--t-slow) var(--ease);
}

.hero-card .hc-self {
  font-size: 2.4rem;
  font-weight: 600;
  line-height: 1;
  color: var(--paper);
  letter-spacing: -0.04em;
  margin-bottom: 8px;
}

.hero-card .hc-label {
  font-family: var(--sans);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--paper-mute);
  margin-bottom: 4px;
}

.hero-card .hc-divider {
  height: 1px;
  background: var(--line);
  margin: 18px 0 16px;
}

.hero-card .hc-user {
  font-size: 1.4rem;
  font-weight: 500;
  color: var(--paper-soft);
}

.hero-card .hc-tag {
  display: inline-block;
  margin-top: 14px;
  padding: 3px 10px;
  font-family: var(--sans);
  font-size: 0.7rem;
  font-weight: 600;
  border-radius: var(--radius-pill);
  background: var(--iris-bg);
  color: var(--iris);
  border: 1px solid var(--iris-line);
}

.hero-card-1 { top: 0; left: 0; transform: rotate(-6deg) translateZ(0); z-index: 3; }
.hero-card-2 { top: 30px; left: 140px; transform: rotate(4deg) translateZ(-40px); z-index: 2; opacity: 0.88; }
.hero-card-3 { top: 180px; left: 40px; transform: rotate(-2deg) translateZ(-80px); z-index: 1; opacity: 0.66; }

.hero-stack:hover .hero-card-1 { transform: rotate(-3deg) translateY(-6px) translateZ(0); }
.hero-stack:hover .hero-card-2 { transform: rotate(2deg) translateY(-3px) translateZ(-40px); }
.hero-stack:hover .hero-card-3 { transform: rotate(-1deg) translateY(0) translateZ(-80px); }

@media (max-width: 880px) {
  .hero-stack { min-height: 320px; }
  .hero-card { width: 220px; }
  .hero-card .hc-self { font-size: 2rem; }
}

/* Hero 平台条 */
.hero-platforms {
  margin-top: 56px;
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  align-items: center;
  color: var(--paper-mute);
  font-size: 0.78rem;
}

.hero-platforms .pf-label {
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 600;
}

.platform-chip {
  padding: 4px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  font-size: 0.76rem;
  font-weight: 500;
  color: var(--paper-soft);
  transition: all var(--t-fast) var(--ease);
}

.platform-chip:hover {
  border-color: var(--iris-line);
  color: var(--iris);
}

/* =============================================================================
 * Section: How — 三层架构
 * ========================================================================== */

.how-layers {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  position: relative;
}

@media (max-width: 880px) {
  .how-layers { grid-template-columns: 1fr; }
}

.layer-card {
  padding: 32px 28px;
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-sat));
  backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-sat));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: all var(--t-base) var(--ease);
  position: relative;
  overflow: hidden;
}

.layer-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--iris-line), transparent);
  opacity: 0;
  transition: opacity var(--t-base) var(--ease);
}

.layer-card:hover::before { opacity: 1; }

.layer-card:hover {
  border-color: var(--line-strong);
  transform: translateY(-2px);
  background: var(--glass-bg-hi);
}

.layer-num {
  font-family: var(--serif);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--iris);
  margin-bottom: 16px;
}

.layer-card h3 {
  margin-bottom: 12px;
  font-size: 1.32rem;
}

.layer-card p {
  color: var(--paper-soft);
  font-size: 0.95rem;
  margin-bottom: 20px;
  line-height: 1.7;
}

.layer-path {
  display: inline-block;
  padding: 5px 10px;
  background: var(--ink-2);
  border-radius: var(--radius-xs);
  font-size: 0.78rem;
  color: var(--paper-soft);
  border: 1px solid var(--line);
}

.formula-line {
  margin-top: 56px;
  padding: 26px 36px;
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-sat));
  backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-sat));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 14px;
  font-family: var(--serif);
  flex-wrap: wrap;
}

.formula-line .num {
  font-size: 2.4rem;
  font-weight: 600;
  color: var(--iris);
  letter-spacing: -0.04em;
  line-height: 1;
}

.formula-line .word {
  color: var(--paper-soft);
  font-size: 0.95rem;
  font-family: var(--sans);
}

.formula-line .op {
  font-size: 1.6rem;
  color: var(--paper-faint);
  font-weight: 300;
  margin: 0 4px;
}

.formula-line .total {
  color: var(--paper);
  font-size: 2.8rem;
  font-weight: 600;
}

/* =============================================================================
 * Section: Personas — 角色卡画廊
 * ========================================================================== */

.persona-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 18px;
}

.persona-card {
  position: relative;
  padding: 28px 26px 24px;
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-sat));
  backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-sat));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all var(--t-base) var(--ease);
}

.persona-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 3px;
  background: var(--card-accent, var(--iris));
  opacity: 0.65;
  transition: opacity var(--t-base) var(--ease), width var(--t-base) var(--ease);
}

.persona-card:hover::before {
  width: 4px;
  opacity: 1;
}

.persona-card:hover {
  border-color: var(--line-strong);
  background: var(--glass-bg-hi);
  transform: translateY(-3px);
}

.pc-row1 {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 18px;
}

.pc-name {
  font-family: var(--serif);
  font-size: 1.32rem;
  font-weight: 600;
  letter-spacing: -0.015em;
  line-height: 1.25;
  margin-bottom: 4px;
  color: var(--paper);
}

.pc-style {
  font-size: 0.78rem;
  color: var(--paper-mute);
  letter-spacing: 0.01em;
}

.pc-badge {
  flex-shrink: 0;
  padding: 3px 9px;
  border-radius: var(--radius-pill);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: var(--card-accent, var(--iris));
  color: var(--ink-0);
  opacity: 0.85;
}

.pc-desc {
  color: var(--paper-soft);
  font-size: 0.9rem;
  line-height: 1.65;
  margin-bottom: 20px;
  min-height: 3.3em;
}

.pc-voice {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  padding: 14px 16px;
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
}

.pc-voice-cell {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.pc-voice-cell .v-label {
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--paper-mute);
}

.pc-voice-cell .v-val {
  font-family: var(--serif);
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--paper);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.pc-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  font-size: 0.74rem;
  color: var(--paper-mute);
}

.pc-register {
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  background: var(--ink-2);
  color: var(--paper-soft);
  font-weight: 600;
  letter-spacing: 0.02em;
}

.pc-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.pc-tag {
  font-size: 0.7rem;
  color: var(--paper-mute);
}

.pc-tag::before { content: '#'; opacity: 0.5; }

/* =============================================================================
 * Section: Spec — Tech Persona Card 标准
 * ========================================================================== */

.spec-wrap {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 50px;
  align-items: center;
}

@media (max-width: 880px) {
  .spec-wrap { grid-template-columns: 1fr; gap: 40px; }
}

.spec-points { display: grid; gap: 8px; }

.spec-point {
  display: flex;
  gap: 18px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
  align-items: flex-start;
}

.spec-point:last-child { border-bottom: none; }

.spec-point .sp-num {
  font-family: var(--serif);
  font-size: 0.95rem;
  color: var(--iris);
  font-weight: 600;
  min-width: 32px;
  letter-spacing: 0.02em;
}

.spec-point .sp-body strong {
  display: block;
  font-family: var(--serif);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--paper);
  margin-bottom: 4px;
  letter-spacing: -0.005em;
}

.spec-point .sp-body span {
  color: var(--paper-soft);
  font-size: 0.88rem;
  line-height: 1.6;
}

.spec-actions {
  margin-top: 36px;
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.spec-preview {
  padding: 26px 28px;
  background: var(--glass-bg-hi);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-sat));
  backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-sat));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--paper-soft);
  position: relative;
  overflow: hidden;
}

.spec-preview::before {
  content: 'persona-card.json';
  position: absolute;
  top: 0;
  right: 0;
  padding: 6px 14px;
  background: var(--ink-2);
  font-family: var(--sans);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  color: var(--paper-mute);
  border-bottom-left-radius: var(--radius-sm);
  border-left: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.spec-preview .k { color: var(--iris); }
.spec-preview .s { color: var(--moss); }
.spec-preview .p { color: var(--paper-mute); }
.spec-preview .indent { padding-left: 1.6em; }

/* =============================================================================
 * Section: Install
 * ========================================================================== */

.install-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

@media (max-width: 720px) {
  .install-grid { grid-template-columns: 1fr; }
}

.install-card {
  padding: 22px 24px;
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-sat));
  backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-sat));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: all var(--t-base) var(--ease);
  position: relative;
}

.install-card:hover {
  border-color: var(--line-strong);
  background: var(--glass-bg-hi);
}

.install-card .ic-name {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--serif);
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 14px;
  color: var(--paper);
}

.install-card .ic-name::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--iris);
  box-shadow: 0 0 12px var(--iris-glow);
}

.install-card code {
  display: block;
  padding: 10px 14px;
  background: rgba(0, 0, 0, 0.32);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  color: var(--moss);
  margin-bottom: 6px;
  overflow-x: auto;
}

.install-card .ic-alt {
  font-size: 0.78rem;
  color: var(--paper-mute);
  margin-top: 8px;
}

.install-card .ic-alt code {
  display: inline;
  padding: 1px 6px;
  background: var(--ink-2);
  color: var(--paper-soft);
  font-size: 0.76rem;
  border: 1px solid var(--line);
  margin: 0;
}

.install-tip {
  margin-top: 32px;
  padding: 18px 22px;
  background: var(--iris-bg);
  border: 1px solid var(--iris-line);
  border-radius: var(--radius);
  font-size: 0.88rem;
  color: var(--paper-soft);
  display: flex;
  align-items: center;
  gap: 14px;
}

.install-tip::before {
  content: '✦';
  font-family: var(--serif);
  color: var(--iris);
  font-size: 1.4rem;
}

.install-tip code {
  padding: 2px 8px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-xs);
  color: var(--paper);
  font-size: 0.8rem;
}

/* =============================================================================
 * Footer
 * ========================================================================== */

footer {
  padding: 60px 0 80px;
  border-top: 1px solid var(--line);
  margin-top: 80px;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
  font-size: 0.82rem;
  color: var(--paper-mute);
}

.footer-links {
  display: flex;
  gap: 26px;
}

.footer-links a {
  color: var(--paper-mute);
  transition: color var(--t-fast) var(--ease);
}

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

/* =============================================================================
 * Submit 页面专用
 * ========================================================================== */

.submit-hero {
  padding: 160px 0 60px;
  text-align: left;
}

.submit-hero h1 {
  font-size: clamp(2.2rem, 4.6vw, 3.4rem);
  margin-bottom: 18px;
}

.submit-hero .lead { font-size: 1.05rem; }

.submit-steps {
  display: grid;
  gap: 20px;
  padding-top: 30px;
}

.submit-step {
  padding: 32px;
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-sat));
  backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-sat));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  position: relative;
}

.step-header {
  display: flex;
  gap: 22px;
  margin-bottom: 24px;
  align-items: flex-start;
}

.step-num {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--iris-bg);
  border: 1px solid var(--iris-line);
  color: var(--iris);
  font-family: var(--serif);
  font-size: 1.4rem;
  font-weight: 600;
  display: grid;
  place-items: center;
  letter-spacing: -0.02em;
}

.step-header h3 {
  margin-bottom: 6px;
  font-size: 1.2rem;
}

.step-header p {
  color: var(--paper-soft);
  font-size: 0.95rem;
  line-height: 1.65;
}

.ai-prompt-box {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(0, 0, 0, 0.3);
  overflow: hidden;
}

.ai-prompt-box pre {
  padding: 20px 22px;
  overflow-x: auto;
  font-size: 0.82rem;
  color: var(--paper-soft);
  line-height: 1.7;
  max-height: 360px;
  overflow-y: auto;
}

.ai-prompt-box .copy-btn-lg {
  position: absolute;
  top: 12px;
  right: 12px;
  background: var(--ink-2);
}

.ai-tips {
  margin-top: 20px;
  padding: 18px 22px;
  background: var(--iris-bg);
  border: 1px solid var(--iris-line);
  border-radius: var(--radius-sm);
}

.ai-tips h4 {
  font-family: var(--serif);
  font-size: 0.95rem;
  color: var(--iris);
  margin-bottom: 10px;
  font-weight: 600;
}

.ai-tips ul { list-style: none; }

.ai-tips li {
  padding-left: 18px;
  color: var(--paper-soft);
  font-size: 0.88rem;
  line-height: 1.7;
  position: relative;
}

.ai-tips li::before {
  content: '·';
  position: absolute;
  left: 6px;
  color: var(--iris);
  font-weight: 700;
}

.review-checklist {
  display: grid;
  gap: 12px;
}

.review-checklist label {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px;
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--t-fast) var(--ease);
  font-size: 0.9rem;
  color: var(--paper-soft);
}

.review-checklist label:hover {
  border-color: var(--iris-line);
  background: var(--iris-bg);
}

.review-checklist input[type="checkbox"] {
  margin-top: 3px;
  accent-color: var(--iris);
  cursor: pointer;
}

.submit-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 26px;
  background: var(--paper);
  color: var(--ink-0);
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  font-weight: 600;
  transition: all var(--t-fast) var(--ease);
}

.submit-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(236, 237, 245, 0.18);
}

.submit-btn::after { content: '→'; transition: transform var(--t-fast) var(--ease); }
.submit-btn:hover::after { transform: translateX(3px); }

.example-collapse {
  margin-top: 24px;
}

.example-collapse > summary {
  padding: 18px 24px;
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(var(--glass-blur));
  backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  cursor: pointer;
  list-style: none;
  font-family: var(--serif);
  font-size: 1rem;
  color: var(--paper);
  font-weight: 500;
  position: relative;
  transition: all var(--t-fast) var(--ease);
}

.example-collapse > summary::after {
  content: '+';
  position: absolute;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.4rem;
  color: var(--iris);
  transition: transform var(--t-base) var(--ease);
}

.example-collapse[open] > summary::after { transform: translateY(-50%) rotate(45deg); }
.example-collapse > summary:hover { border-color: var(--line-strong); }
.example-collapse > summary::-webkit-details-marker { display: none; }

.example-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 14px;
}

@media (max-width: 880px) {
  .example-split { grid-template-columns: 1fr; }
}

.example-block {
  position: relative;
  padding: 24px;
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(var(--glass-blur));
  backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.example-label {
  font-family: var(--mono);
  font-size: 0.76rem;
  color: var(--paper-mute);
  margin-bottom: 12px;
  letter-spacing: 0.02em;
}

.example-block pre {
  overflow-x: auto;
  font-size: 0.78rem;
  line-height: 1.65;
  color: var(--paper-soft);
  max-height: 400px;
  overflow-y: auto;
}

.example-block .copy-btn {
  position: absolute;
  top: 16px;
  right: 16px;
}

/* =============================================================================
 * Accessibility
 * ========================================================================== */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .hero h1 .accent { animation: none; }
}

@media (prefers-contrast: more) {
  :root {
    --line: rgba(255, 255, 255, 0.18);
    --line-strong: rgba(255, 255, 255, 0.32);
    --paper-soft: rgba(236, 237, 245, 0.85);
    --paper-mute: rgba(236, 237, 245, 0.62);
  }
}

:focus-visible {
  outline: 2px solid var(--iris);
  outline-offset: 3px;
  border-radius: var(--radius-xs);
}

/* =============================================================================
 * Section: Security — v4 原生安全套件
 * ========================================================================== */

.security-section {
  padding: 100px 0;
  background:
    radial-gradient(circle at 50% 0%, rgba(155, 140, 255, 0.06), transparent 50%);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.security-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 18px;
  margin-top: 48px;
}

.security-card {
  position: relative;
  display: block;
  padding: 28px 26px 64px;
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-sat));
  backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-sat));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: inherit;
  text-decoration: none;
  overflow: hidden;
  transition: all var(--t-base) var(--ease);
}

.security-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg,
    transparent,
    var(--iris),
    transparent);
  opacity: 0;
  transition: opacity var(--t-base) var(--ease);
}

.security-card:hover {
  border-color: var(--line-strong);
  background: var(--glass-bg-hi);
  transform: translateY(-3px);
}

.security-card:hover::before {
  opacity: 1;
}

.sec-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: rgba(155, 140, 255, 0.08);
  color: var(--iris);
  margin-bottom: 18px;
  transition: all var(--t-base) var(--ease);
}

.security-card:hover .sec-icon {
  background: rgba(155, 140, 255, 0.18);
  transform: scale(1.04);
}

.security-card h3 {
  font-family: var(--mono);
  font-size: 0.98rem;
  font-weight: 600;
  margin: 0 0 10px;
  color: var(--paper);
  letter-spacing: -0.2px;
}

.security-card p {
  font-size: 0.92rem;
  line-height: 1.6;
  color: var(--paper-soft);
  margin: 0;
}

.sec-tag {
  position: absolute;
  bottom: 22px;
  left: 26px;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.5px;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(155, 140, 255, 0.10);
  border: 1px solid rgba(155, 140, 255, 0.22);
  color: var(--iris);
}

.security-actions {
  display: flex;
  justify-content: center;
  margin-top: 36px;
}