/* ==========================================================================
   AI Culler — Landing page stylesheet
   深色主视觉 + 橙色品牌色（源自 LOGO #F07800）+ 青色点缀
   纯手写，无外部依赖，离线可用
   ========================================================================== */

/* ---------- 1. 设计变量 ---------- */
:root {
  /* 品牌色 */
  --brand: #ff7a00;
  --brand-2: #ffb347;
  --brand-soft: rgba(255, 122, 0, 0.12);
  --cyan: #22d3ee;
  --navy: #001830;

  /* 背景层 */
  --bg-0: #05080f;
  --bg-1: #08101c;
  --bg-2: #0b1524;

  /* 面层 */
  --card: rgba(255, 255, 255, 0.035);
  --card-hover: rgba(255, 255, 255, 0.06);
  --line: rgba(255, 255, 255, 0.09);
  --line-strong: rgba(255, 255, 255, 0.16);

  /* 文字 */
  --fg: #eef3fa;
  --fg-2: #a8b8cc;
  --fg-3: #6d7f95;

  /* 排版 */
  --f-sans: "Bahnschrift", "Inter", "Segoe UI", -apple-system, BlinkMacSystemFont,
    "Helvetica Neue", Arial, "Noto Sans", "Noto Sans JP", "Noto Sans KR", sans-serif;
  --f-mono: "SF Mono", "JetBrains Mono", Consolas, "Courier New", monospace;

  /* 尺寸 */
  --max: 1220px;
  --r-sm: 10px;
  --r-md: 16px;
  --r-lg: 24px;
  --r-xl: 32px;

  /* 动效 */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ---------- 2. 基础重置 ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg-0);
  color: var(--fg);
  font-family: var(--f-sans);
  font-size: 16px;
  line-height: 1.65;
  letter-spacing: 0.01em;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* 语言为日/韩时字距略收紧，视觉更整齐 */
html[lang="ja"] body,
html[lang="ko"] body {
  letter-spacing: 0;
}

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

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

::selection {
  background: var(--brand);
  color: #fff;
}

/* 自定义滚动条 */
::-webkit-scrollbar {
  width: 10px;
}
::-webkit-scrollbar-track {
  background: var(--bg-0);
}
::-webkit-scrollbar-thumb {
  background: #1d2b3d;
  border-radius: 8px;
}
::-webkit-scrollbar-thumb:hover {
  background: #2b3d54;
}

/* ---------- 3. 全局背景层 ---------- */
.bg-layer {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

/* 3.1 canvas 粒子/连线 */
#bg-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.55;
}

/* 3.2 顶部橙色光晕 */
.bg-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.5;
}
.bg-glow--a {
  width: 760px;
  height: 760px;
  top: -340px;
  right: -180px;
  background: radial-gradient(circle, rgba(255, 122, 0, 0.42), transparent 65%);
}
.bg-glow--b {
  width: 620px;
  height: 620px;
  top: 40%;
  left: -280px;
  background: radial-gradient(circle, rgba(34, 211, 238, 0.16), transparent 68%);
}
.bg-glow--c {
  width: 900px;
  height: 900px;
  bottom: -520px;
  left: 30%;
  background: radial-gradient(circle, rgba(255, 122, 0, 0.14), transparent 70%);
}

/* 3.3 细网格 */
.bg-grid {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(255, 255, 255, 0.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.028) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 35%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 35%, transparent 78%);
}

/* 3.4 跟随鼠标的高光 */
.bg-spot {
  position: absolute;
  width: 560px;
  height: 560px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 122, 0, 0.13), transparent 62%);
  transform: translate(-50%, -50%);
  transition: opacity 0.4s;
  opacity: 0;
}

/* ---------- 4. 布局容器 ---------- */
.wrap {
  position: relative;
  z-index: 1;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 24px;
}

section {
  position: relative;
  z-index: 1;
  padding: 104px 0;
}

.section-head {
  max-width: 780px;
  margin-bottom: 56px;
}
.section-head--center {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  padding: 6px 14px 6px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.03);
  color: var(--brand-2);
  font-family: var(--f-mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.eyebrow::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--brand);
  box-shadow: 0 0 10px var(--brand);
}

h2 {
  margin: 0 0 18px;
  font-size: clamp(1.85rem, 1.1vw + 1.5rem, 2.9rem);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.028em;
}

h3 {
  margin: 0 0 10px;
  font-size: 1.16rem;
  font-weight: 700;
  letter-spacing: -0.012em;
}

.lead {
  margin: 0;
  color: var(--fg-2);
  font-size: clamp(1rem, 0.35vw + 0.94rem, 1.12rem);
  line-height: 1.72;
}

.grad {
  background: linear-gradient(102deg, var(--brand) 8%, var(--brand-2) 52%, #ffd9a0 96%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- 5. 导航 ---------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 60;
  transition: background 0.35s var(--ease), border-color 0.35s, backdrop-filter 0.35s;
  border-bottom: 1px solid transparent;
}
.nav.is-stuck {
  background: rgba(5, 8, 15, 0.82);
  backdrop-filter: blur(18px) saturate(150%);
  -webkit-backdrop-filter: blur(18px) saturate(150%);
  border-bottom-color: var(--line);
}

.nav-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 5px 24px;
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: -0.02em;
  flex: 0 0 auto;
}
.nav-logo img {
  width: 60px;
  height: 60px;
  border-radius: 15px;
}
.nav-logo span {
  font-size: 1.2rem;
}

.nav-links {
  display: flex;
  gap: 26px;
  margin-left: 8px;
  flex: 1 1 auto;
}
.nav-links a {
  position: relative;
  color: var(--fg-2);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: -5px;
  height: 1.5px;
  background: var(--brand);
  transition: right 0.3s var(--ease);
}
.nav-links a:hover {
  color: var(--fg);
}
.nav-links a:hover::after {
  right: 0;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}

/* 语言选择器 */
.lang {
  position: relative;
}
.lang-btn {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--fg-2);
  font-size: 0.83rem;
  font-weight: 600;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}
.lang-btn:hover {
  border-color: var(--line-strong);
  color: var(--fg);
  background: rgba(255, 255, 255, 0.04);
}
.lang-btn svg {
  width: 11px;
  height: 11px;
  transition: transform 0.25s var(--ease);
}
.lang.is-open .lang-btn svg {
  transform: rotate(180deg);
}

.lang-menu {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  min-width: 168px;
  padding: 6px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(12, 20, 33, 0.97);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.6);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px) scale(0.98);
  transition: opacity 0.22s var(--ease), transform 0.22s var(--ease), visibility 0.22s;
}
.lang.is-open .lang-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}
.lang-menu button {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 9px 12px;
  border-radius: 9px;
  color: var(--fg-2);
  font-size: 0.88rem;
  text-align: left;
  transition: background 0.16s, color 0.16s;
}
.lang-menu button:hover {
  background: rgba(255, 255, 255, 0.06);
  color: var(--fg);
}
.lang-menu button.is-active {
  color: var(--brand-2);
  background: var(--brand-soft);
}
.lang-menu em {
  font-style: normal;
  font-family: var(--f-mono);
  font-size: 0.7rem;
  color: var(--fg-3);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 12px 22px;
  border-radius: 999px;
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: 0.005em;
  white-space: nowrap;
  transition: transform 0.2s var(--ease), box-shadow 0.25s, background 0.25s,
    border-color 0.25s, color 0.25s;
}
.btn:active {
  transform: scale(0.975);
}

.btn--brand {
  background: linear-gradient(135deg, var(--brand), #ff9a2b);
  color: #1a0d00;
  box-shadow: 0 10px 30px rgba(255, 122, 0, 0.32), inset 0 1px 0 rgba(255, 255, 255, 0.35);
}
.btn--brand:hover {
  box-shadow: 0 16px 44px rgba(255, 122, 0, 0.46), inset 0 1px 0 rgba(255, 255, 255, 0.4);
  transform: translateY(-2px);
}

.btn--ghost {
  border: 1px solid var(--line-strong);
  color: var(--fg);
  background: rgba(255, 255, 255, 0.02);
}
.btn--ghost:hover {
  border-color: var(--brand);
  color: var(--brand-2);
  background: var(--brand-soft);
  transform: translateY(-2px);
}

.btn--sm {
  padding: 9px 17px;
  font-size: 0.84rem;
}

/* 汉堡（移动端） */
.nav-burger {
  display: none;
  width: 38px;
  height: 38px;
  border: 1px solid var(--line);
  border-radius: 10px;
  place-items: center;
}
.nav-burger span {
  display: block;
  width: 16px;
  height: 1.6px;
  background: var(--fg);
  position: relative;
}
.nav-burger span::before,
.nav-burger span::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 1.6px;
  background: var(--fg);
}
.nav-burger span::before {
  top: -5px;
}
.nav-burger span::after {
  top: 5px;
}

/* ---------- 6. Hero ---------- */
.hero {
  padding: 168px 0 72px;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.02fr 0.98fr;
  gap: 56px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 7px 15px 7px 8px;
  margin-bottom: 26px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.035);
  font-size: 0.79rem;
  font-weight: 600;
  color: var(--fg-2);
}
.hero-badge b {
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--brand-soft);
  color: var(--brand-2);
  font-family: var(--f-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

h1 {
  margin: 0 0 22px;
  font-size: clamp(2.4rem, 3.6vw + 1rem, 4.15rem);
  font-weight: 800;
  line-height: 1.03;
  letter-spacing: -0.038em;
}
h1 .line {
  display: block;
}
h1 .dim {
  color: var(--fg-3);
}

.hero-sub {
  max-width: 540px;
  margin: 0 0 32px;
  color: var(--fg-2);
  font-size: clamp(1rem, 0.4vw + 0.93rem, 1.14rem);
  line-height: 1.72;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 30px;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  color: var(--fg-3);
  font-size: 0.82rem;
}
.hero-meta span {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}
.hero-meta svg {
  width: 14px;
  height: 14px;
  color: var(--brand);
  flex: 0 0 auto;
}

/* Hero 截图（3D 透视） */
.hero-visual {
  position: relative;
  perspective: 1600px;
}
.hero-shot {
  position: relative;
  padding-top: 26px; /* 给假窗口标题栏留位，避免遮挡界面顶部的菜单行 */
  border-radius: var(--r-lg);
  border: 1px solid var(--line-strong);
  background: #0a1220;
  overflow: hidden;
  box-shadow: 0 50px 110px -30px rgba(0, 0, 0, 0.9), 0 0 0 1px rgba(255, 255, 255, 0.05),
    0 30px 80px -40px rgba(255, 122, 0, 0.35);
  transform: rotateY(-9deg) rotateX(4deg) translateZ(0);
  transition: transform 0.7s var(--ease);
  will-change: transform;
}
.hero-visual:hover .hero-shot {
  transform: rotateY(-3deg) rotateX(1.5deg) translateY(-6px);
}
.hero-shot img {
  width: 100%;
  height: auto;
}

/* 顶部假窗口条 */
.hero-shot::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 26px;
  background: linear-gradient(#0f1a29, #0b1420);
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
  z-index: 2;
}
.hero-dots {
  position: absolute;
  top: 9px;
  left: 12px;
  display: flex;
  gap: 6px;
  z-index: 3;
}
.hero-dots i {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #2a3a4f;
}
.hero-dots i:first-child {
  background: #ff5f57;
}
.hero-dots i:nth-child(2) {
  background: #febc2e;
}
.hero-dots i:nth-child(3) {
  background: #28c840;
}

/* 截图上的浮动数据卡 */
.float-card {
  position: absolute;
  z-index: 4;
  padding: 11px 15px;
  border: 1px solid var(--line-strong);
  border-radius: 13px;
  background: rgba(9, 15, 25, 0.9);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.55);
  font-family: var(--f-mono);
  font-size: 0.72rem;
  color: var(--fg-2);
  animation: floaty 6s ease-in-out infinite;
}
.float-card b {
  display: block;
  color: var(--brand-2);
  font-size: 0.98rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}
.float-card--a {
  top: 16%;
  left: -34px;
  animation-delay: -1.2s;
}
.float-card--b {
  bottom: 12%;
  right: -26px;
  animation-delay: -3.4s;
}
@keyframes floaty {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-11px);
  }
}

/* ---------- 7. 数据条（Hero 下方） ---------- */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  margin-top: 88px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--line);
  overflow: hidden;
}
.stat {
  padding: 30px 26px;
  background: linear-gradient(180deg, rgba(11, 21, 36, 0.9), rgba(6, 12, 21, 0.92));
  transition: background 0.3s;
}
.stat:hover {
  background: linear-gradient(180deg, rgba(16, 28, 46, 0.95), rgba(8, 15, 26, 0.95));
}
.stat-num {
  display: flex;
  align-items: baseline;
  gap: 4px;
  font-size: clamp(1.9rem, 1.4vw + 1.4rem, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  font-variant-numeric: tabular-nums;
  line-height: 1;
  color: var(--fg);
}
.stat-num small {
  font-size: 0.4em;
  font-weight: 700;
  color: var(--brand-2);
  letter-spacing: 0;
}
.stat-label {
  margin-top: 10px;
  color: var(--fg-3);
  font-size: 0.8rem;
  line-height: 1.45;
}

/* ---------- 8. 价值卡 ---------- */
.cards-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.card {
  position: relative;
  padding: 32px 28px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--card);
  overflow: hidden;
  transition: transform 0.4s var(--ease), border-color 0.35s, background 0.35s;
}
.card::after {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  background: radial-gradient(420px circle at var(--mx, 50%) var(--my, 0%), rgba(255, 122, 0, 0.14), transparent 62%);
  opacity: 0;
  transition: opacity 0.4s;
  pointer-events: none;
}
.card:hover {
  transform: translateY(-5px);
  border-color: rgba(255, 122, 0, 0.4);
  background: var(--card-hover);
}
.card:hover::after {
  opacity: 1;
}

.card-icon {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  margin-bottom: 20px;
  border: 1px solid rgba(255, 122, 0, 0.32);
  border-radius: 13px;
  background: linear-gradient(150deg, rgba(255, 122, 0, 0.18), rgba(255, 122, 0, 0.03));
  color: var(--brand-2);
}
.card-icon svg {
  width: 22px;
  height: 22px;
}
.card p {
  margin: 0;
  color: var(--fg-2);
  font-size: 0.92rem;
  line-height: 1.66;
}

/* ---------- 9. AI 能力列表 ---------- */
.tabs-shell {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 20px;
  align-items: stretch;
}

.tabs {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.tab {
  position: relative;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.02);
  text-align: left;
  transition: border-color 0.28s, background 0.28s, transform 0.28s var(--ease);
}
.tab:hover {
  border-color: var(--line-strong);
  transform: translateX(3px);
}
.tab.is-active {
  border-color: rgba(255, 122, 0, 0.55);
  background: linear-gradient(100deg, rgba(255, 122, 0, 0.14), rgba(255, 122, 0, 0.02));
}
.tab.is-active::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18%;
  bottom: 18%;
  width: 2.5px;
  border-radius: 3px;
  background: var(--brand);
  box-shadow: 0 0 12px var(--brand);
}
.tab b {
  display: block;
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 3px;
}
.tab span {
  color: var(--fg-3);
  font-size: 0.79rem;
  line-height: 1.45;
}

.panel {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: linear-gradient(160deg, rgba(16, 27, 44, 0.72), rgba(7, 13, 23, 0.86));
  overflow: hidden;
}
.panel-body {
  position: relative;
  padding: 26px 34px 30px;
}
.panel::before {
  content: "";
  position: absolute;
  top: -140px;
  right: -120px;
  width: 340px;
  height: 340px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 122, 0, 0.16), transparent 66%);
  filter: blur(20px);
}
.panel-item {
  display: none;
  animation: fadeUp 0.45s var(--ease) both;
}
.panel-item.is-active {
  display: block;
}
.panel-item h3 {
  font-size: 1.32rem;
  margin-bottom: 12px;
}
.panel-item p {
  margin: 0 0 18px;
  color: var(--fg-2);
  font-size: 0.95rem;
  line-height: 1.72;
}
.panel-item ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 11px;
}
.panel-item li {
  position: relative;
  padding-left: 24px;
  color: var(--fg-2);
  font-size: 0.89rem;
  line-height: 1.6;
}
.panel-item li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 1.5px solid var(--brand);
  background: rgba(255, 122, 0, 0.16);
}
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 10. 三步流程 ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  counter-reset: step;
}
.step {
  position: relative;
  padding: 34px 28px 30px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: rgba(255, 255, 255, 0.022);
  transition: border-color 0.3s, transform 0.4s var(--ease);
}
.step:hover {
  border-color: rgba(255, 122, 0, 0.34);
  transform: translateY(-4px);
}
.step-num {
  display: inline-block;
  margin-bottom: 16px;
  font-family: var(--f-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--brand);
}
.step h3 {
  font-size: 1.08rem;
}
.step p {
  margin: 0;
  color: var(--fg-2);
  font-size: 0.89rem;
  line-height: 1.62;
}

/* ---------- 11. 截图展台 ---------- */
.showcase {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  background: linear-gradient(180deg, rgba(13, 23, 39, 0.6), rgba(6, 11, 20, 0.9));
  padding: 26px;
  overflow: hidden;
}
.showcase-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 20px;
}
.seg {
  display: inline-flex;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.03);
}
.seg button {
  padding: 7px 16px;
  border-radius: 999px;
  color: var(--fg-3);
  font-size: 0.82rem;
  font-weight: 600;
  transition: background 0.25s, color 0.25s;
}
.seg button.is-active {
  background: rgba(255, 122, 0, 0.16);
  color: var(--brand-2);
}
.showcase-frame {
  position: relative;
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  box-shadow: 0 40px 90px -34px rgba(0, 0, 0, 0.9);
}
.showcase-frame img {
  width: 100%;
  height: auto;
  transition: opacity 0.4s var(--ease);
}

/* ---------- 12. 格式支持 ---------- */
.formats {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
}
.chip {
  padding: 14px 10px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.025);
  text-align: center;
  font-family: var(--f-mono);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--fg-2);
  letter-spacing: 0.04em;
  transition: border-color 0.25s, color 0.25s, background 0.25s, transform 0.25s;
}
.chip:hover {
  border-color: rgba(255, 122, 0, 0.5);
  color: var(--brand-2);
  background: var(--brand-soft);
  transform: translateY(-3px);
}
.chip--raw {
  border-color: rgba(255, 255, 255, 0.06);
  color: var(--fg-3);
}

.formats-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-top: 18px;
  color: var(--fg-3);
  font-size: 0.79rem;
}
.formats-legend b {
  color: var(--fg-2);
  font-family: var(--f-mono);
}

/* ---------- 13. 可控性（开关矩阵） ---------- */
.matrix {
  width: 100%;
  border-collapse: collapse;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  font-size: 0.89rem;
}
.matrix th,
.matrix td {
  padding: 15px 18px;
  text-align: left;
  border-bottom: 1px solid var(--line);
}
.matrix thead th {
  background: rgba(255, 255, 255, 0.035);
  color: var(--fg-2);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.matrix tbody tr:last-child th,
.matrix tbody tr:last-child td {
  border-bottom: 0;
}
.matrix tbody th {
  font-weight: 600;
  color: var(--fg);
}
.matrix td {
  color: var(--fg-2);
}
.yes {
  color: var(--brand-2);
  font-weight: 700;
}
.no {
  color: var(--fg-3);
}
.matrix tr:hover td,
.matrix tr:hover th {
  background: rgba(255, 255, 255, 0.022);
}

/* ---------- 14. 作者区块 ---------- */
.author {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 48px;
  align-items: center;
  padding: 46px;
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  background: linear-gradient(150deg, rgba(19, 31, 50, 0.7), rgba(7, 12, 21, 0.9));
  position: relative;
  overflow: hidden;
}
.author::before {
  content: "";
  position: absolute;
  left: -100px;
  bottom: -160px;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 122, 0, 0.15), transparent 68%);
  filter: blur(12px);
}
.author blockquote {
  margin: 0;
  font-size: clamp(1.05rem, 0.5vw + 0.96rem, 1.28rem);
  line-height: 1.62;
  font-weight: 500;
  letter-spacing: -0.012em;
}
.author blockquote strong {
  color: var(--brand-2);
}
.author-by {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 22px;
  color: var(--fg-3);
  font-size: 0.84rem;
}
.author-avatar {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid rgba(255, 122, 0, 0.4);
  background: var(--brand-soft);
  color: var(--brand-2);
  font-weight: 800;
  font-size: 0.9rem;
}
.author-meta {
  display: grid;
  gap: 12px;
  position: relative;
  z-index: 1;
}
.author-meta div {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  padding: 13px 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.025);
  font-size: 0.84rem;
}
.author-meta span {
  color: var(--fg-3);
}
.author-meta b {
  color: var(--fg);
  text-align: right;
}

/* ---------- 15. 定价 ---------- */
.price-shell {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 24px;
  align-items: stretch;
}
.price-card {
  position: relative;
  padding: 44px 40px;
  border: 1px solid rgba(255, 122, 0, 0.34);
  border-radius: var(--r-xl);
  background: linear-gradient(165deg, rgba(30, 20, 10, 0.55), rgba(8, 12, 20, 0.92));
  overflow: hidden;
}
.price-card::before {
  content: "";
  position: absolute;
  top: -180px;
  right: -140px;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 122, 0, 0.24), transparent 66%);
  filter: blur(24px);
}
.price-tag {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 8px 0 6px;
  position: relative;
}
.price-tag b {
  font-size: clamp(2.4rem, 2vw + 1.6rem, 3.4rem);
  font-weight: 800;
  letter-spacing: -0.045em;
  line-height: 1;
}
.price-tag span {
  color: var(--fg-3);
  font-size: 0.86rem;
}
.price-note {
  color: var(--fg-2);
  font-size: 0.88rem;
  margin: 0 0 26px;
  position: relative;
}
.price-list {
  margin: 0 0 30px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
  position: relative;
}
.price-list li {
  display: flex;
  gap: 11px;
  color: var(--fg-2);
  font-size: 0.9rem;
  line-height: 1.55;
}
.price-list svg {
  width: 17px;
  height: 17px;
  flex: 0 0 auto;
  margin-top: 2px;
  color: var(--brand);
}
.price-side {
  display: grid;
  gap: 14px;
  align-content: center;
}
.price-side-item {
  display: flex;
  gap: 14px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(255, 255, 255, 0.022);
}
.price-side-item svg {
  width: 20px;
  height: 20px;
  flex: 0 0 auto;
  color: var(--cyan);
  margin-top: 2px;
}
.price-side-item b {
  display: block;
  margin-bottom: 4px;
  font-size: 0.92rem;
}
.price-side-item p {
  margin: 0;
  color: var(--fg-3);
  font-size: 0.83rem;
  line-height: 1.55;
}

/* ---------- 16. FAQ ---------- */
.faq {
  display: grid;
  gap: 10px;
  max-width: 880px;
  margin: 0 auto;
}
.qa {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.022);
  overflow: hidden;
  transition: border-color 0.3s, background 0.3s;
}
.qa:hover {
  border-color: var(--line-strong);
}
.qa.is-open {
  border-color: rgba(255, 122, 0, 0.36);
  background: rgba(255, 122, 0, 0.045);
}
.qa-q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  width: 100%;
  padding: 19px 22px;
  text-align: left;
  font-size: 0.96rem;
  font-weight: 600;
}
.qa-q i {
  position: relative;
  flex: 0 0 auto;
  width: 15px;
  height: 15px;
}
.qa-q i::before,
.qa-q i::after {
  content: "";
  position: absolute;
  inset: 50% 0 auto 0;
  height: 1.6px;
  border-radius: 2px;
  background: var(--brand);
  transition: transform 0.3s var(--ease);
}
.qa-q i::after {
  transform: rotate(90deg);
}
.qa.is-open .qa-q i::after {
  transform: rotate(0deg);
}
.qa-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.42s var(--ease);
}
.qa-a p {
  margin: 0;
  padding: 0 22px 22px;
  color: var(--fg-2);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* ---------- 17. 尾部 CTA ---------- */
.final {
  position: relative;
  text-align: center;
  padding: 76px 32px;
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  background: linear-gradient(160deg, rgba(26, 20, 12, 0.6), rgba(7, 11, 19, 0.94));
  overflow: hidden;
}
.final::before {
  content: "";
  position: absolute;
  left: 50%;
  top: -260px;
  width: 780px;
  height: 520px;
  transform: translateX(-50%);
  background: radial-gradient(ellipse, rgba(255, 122, 0, 0.22), transparent 62%);
  filter: blur(30px);
}
.final h2 {
  position: relative;
  font-size: clamp(1.9rem, 2vw + 1.2rem, 3rem);
}
.final .lead {
  position: relative;
  max-width: 560px;
  margin: 0 auto 30px;
}
.final .hero-cta {
  position: relative;
  justify-content: center;
  margin-bottom: 0;
}

/* ---------- 18. 页脚 ---------- */
.foot {
  position: relative;
  z-index: 1;
  padding: 56px 0 42px;
  border-top: 1px solid var(--line);
  margin-top: 96px;
}
.foot-top {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 32px;
  margin-bottom: 38px;
}
.foot-brand {
  max-width: 320px;
}
.foot-brand img {
  width: 176px;
  height: auto;
  margin-bottom: 14px;
}
.foot-brand p {
  margin: 0;
  color: var(--fg-3);
  font-size: 0.83rem;
  line-height: 1.6;
}
.foot-cols {
  display: flex;
  flex-wrap: wrap;
  gap: 56px;
}
.foot-col h4 {
  margin: 0 0 14px;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-3);
}
.foot-col a,
.foot-col p {
  display: block;
  margin: 0 0 9px;
  color: var(--fg-2);
  font-size: 0.85rem;
  transition: color 0.2s;
}
.foot-col a:hover {
  color: var(--brand-2);
}
.foot-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  color: var(--fg-3);
  font-size: 0.78rem;
}

/* ---------- 19. 滚动进场动画 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
[data-reveal].is-in {
  opacity: 1;
  transform: none;
}
[data-reveal][data-delay="1"] {
  transition-delay: 0.07s;
}
[data-reveal][data-delay="2"] {
  transition-delay: 0.14s;
}
[data-reveal][data-delay="3"] {
  transition-delay: 0.21s;
}
[data-reveal][data-delay="4"] {
  transition-delay: 0.28s;
}

/* 顶部滚动进度条 */
.progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: 0;
  background: linear-gradient(90deg, var(--brand), var(--brand-2), var(--cyan));
  z-index: 70;
  box-shadow: 0 0 12px rgba(255, 122, 0, 0.6);
}

/* ---------- 20. 响应式 ---------- */
@media (max-width: 1080px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 46px;
  }
  .hero-visual {
    max-width: 720px;
  }
  .hero-shot {
    transform: none;
  }
  .hero {
    padding-top: 140px;
  }
  .tabs-shell {
    grid-template-columns: 1fr;
  }
  .tabs {
    flex-direction: row;
    flex-wrap: wrap;
  }
  .tab {
    flex: 1 1 200px;
  }
  .author {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 34px;
  }
  .price-shell {
    grid-template-columns: 1fr;
  }
  .formats {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 860px) {
  section {
    padding: 72px 0;
  }
  .nav-links {
    display: none;
  }
  .nav-burger {
    display: grid;
  }
  .nav-inner {
    gap: 14px;
  }
  .nav-right .btn--brand {
    display: none;
  }
  .stats {
    grid-template-columns: repeat(2, 1fr);
  }
  .cards-3,
  .steps {
    grid-template-columns: 1fr;
  }
  .float-card--a {
    left: -8px;
    top: 8%;
  }
  .float-card--b {
    right: -6px;
    bottom: 6%;
  }
  .matrix {
    font-size: 0.82rem;
  }
  .matrix th,
  .matrix td {
    padding: 12px 12px;
  }
  .showcase {
    padding: 16px;
  }
}

@media (max-width: 560px) {
  .wrap {
    padding: 0 18px;
  }
  .hero {
    padding-top: 122px;
  }
  .formats {
    grid-template-columns: repeat(2, 1fr);
  }
  .price-card {
    padding: 32px 24px;
  }
  .float-card {
    display: none;
  }
  .author {
    padding: 26px 22px;
  }
  .panel {
    padding: 26px 22px;
  }
  .foot-cols {
    gap: 32px;
  }
}

/* 移动端展开的导航面板 */
.nav-mobile {
  position: fixed;
  inset: 0;
  z-index: 55;
  display: none;
  padding: 96px 24px 32px;
  background: rgba(5, 8, 15, 0.97);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}
.nav-mobile.is-open {
  display: block;
  animation: fadeUp 0.3s var(--ease);
}
.nav-mobile a {
  display: block;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  font-size: 1.1rem;
  font-weight: 600;
}

/* 减少动效偏好 */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  html {
    scroll-behavior: auto;
  }
  [data-reveal] {
    opacity: 1;
    transform: none;
  }
}

/* 打印（用户若打印成 PDF 也好看） */
@media print {
  .bg-layer,
  .nav,
  .progress {
    display: none !important;
  }
  body {
    background: #fff;
    color: #111;
  }
  section {
    padding: 24px 0;
  }
}


/* ==========================================================================
   21. 语言国旗（Windows 不显示国旗 emoji，全部用本地 SVG）
   ========================================================================== */
.flag {
  display: inline-block;
  width: 19px;
  height: 13px;
  border-radius: 2px;
  object-fit: cover;
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.22), 0 1px 3px rgba(0, 0, 0, 0.45);
  vertical-align: -2px;
  flex: 0 0 auto;
}

/* Hero 里的「5 languages + 五面旗」 */
.lang-meta {
  flex-wrap: wrap;
}
.hero-flags {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin-left: 4px;
}
.hero-flags .hl {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 7px 3px 4px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.03);
  transition: border-color 0.25s, background 0.25s, transform 0.25s;
}
.hero-flags .hl:hover {
  border-color: rgba(255, 122, 0, 0.45);
  background: var(--brand-soft);
  transform: translateY(-2px);
}
.hero-flags .hl i {
  font-style: normal;
  font-family: var(--f-mono);
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--fg-3);
}

/* 语言按钮与下拉里的国旗 */
.lang-btn .flag {
  width: 17px;
  height: 12px;
}
.lang-menu button .lm {
  display: inline-flex;
  align-items: center;
  gap: 9px;
}

/* ==========================================================================
   22. 「在你手里」区块（自动保留 + 手动复核 / RAW 绑定）
   ========================================================================== */
.flow-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 20px;
}
.flow-card {
  position: relative;
  padding: 34px 30px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: linear-gradient(160deg, rgba(16, 27, 44, 0.62), rgba(7, 13, 23, 0.86));
  overflow: hidden;
  transition: border-color 0.35s, transform 0.4s var(--ease);
}
.flow-card::before {
  content: "";
  position: absolute;
  top: -120px;
  right: -100px;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 122, 0, 0.14), transparent 66%);
  filter: blur(16px);
  opacity: 0.8;
}
.flow-card:hover {
  border-color: rgba(255, 122, 0, 0.38);
  transform: translateY(-4px);
}
.flow-card h3 {
  font-size: 1.2rem;
  margin-bottom: 10px;
}
.flow-card > p {
  margin: 0 0 18px;
  color: var(--fg-2);
  font-size: 0.92rem;
  line-height: 1.68;
}
.flow-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
  position: relative;
}
.flow-list li {
  position: relative;
  padding-left: 24px;
  color: var(--fg-2);
  font-size: 0.87rem;
  line-height: 1.58;
}
.flow-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 1.5px solid var(--brand);
  background: rgba(255, 122, 0, 0.16);
}

/* ==========================================================================
   23. 双版本定价
   ========================================================================== */
.price-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
  align-items: stretch;
}
.price-grid .price-card {
  padding: 38px 34px;
  display: flex;
  flex-direction: column;
  border-color: var(--line);
  background: linear-gradient(165deg, rgba(15, 24, 39, 0.75), rgba(7, 11, 19, 0.94));
}
.price-grid .price-card--featured {
  border-color: rgba(255, 122, 0, 0.42);
  background: linear-gradient(165deg, rgba(32, 21, 10, 0.62), rgba(8, 12, 20, 0.94));
}
.price-off {
  display: inline-block;
  align-self: flex-start;
  margin-bottom: 16px;
  padding: 5px 12px;
  border: 1px solid rgba(255, 122, 0, 0.4);
  border-radius: 999px;
  background: rgba(255, 122, 0, 0.12);
  color: var(--brand-2);
  font-family: var(--f-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  line-height: 1.5;
}
.price-name {
  margin: 0 0 4px;
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.025em;
}
.price-for {
  margin: 0 0 20px;
  color: var(--fg-3);
  font-size: 0.86rem;
}
.price-tag s {
  color: var(--fg-3);
  font-size: 1rem;
  font-weight: 600;
  text-decoration-color: rgba(255, 122, 0, 0.6);
}
.price-grid .price-list {
  flex: 1 1 auto;
  margin-bottom: 26px;
}
.price-grid .btn {
  width: 100%;
}
.price-notes {
  display: grid;
  gap: 10px;
  margin-top: 24px;
  padding: 22px 24px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(255, 255, 255, 0.02);
}
.price-notes p {
  display: flex;
  gap: 10px;
  margin: 0;
  color: var(--fg-2);
  font-size: 0.83rem;
  line-height: 1.6;
}
.price-notes svg {
  width: 16px;
  height: 16px;
  flex: 0 0 auto;
  margin-top: 2px;
  color: var(--brand);
}

/* 数据条数字轻微弹入 */
@keyframes numPop {
  from {
    opacity: 0;
    transform: translateY(10px) scale(0.96);
  }
  to {
    opacity: 1;
    transform: none;
  }
}
.stats.is-in .stat-num {
  animation: numPop 0.62s var(--ease) both;
}
.stats.is-in .stat:nth-child(2) .stat-num {
  animation-delay: 0.09s;
}
.stats.is-in .stat:nth-child(3) .stat-num {
  animation-delay: 0.18s;
}
.stats.is-in .stat:nth-child(4) .stat-num {
  animation-delay: 0.27s;
}

/* ==========================================================================
   24. 法律页面（privacy / eula / third-party / refund）
   ========================================================================== */
.legal-head {
  padding: 148px 0 34px;
}
.legal-head h1 {
  font-size: clamp(1.9rem, 2vw + 1.2rem, 2.9rem);
  margin-bottom: 14px;
}
.legal-head .meta {
  color: var(--fg-3);
  font-size: 0.84rem;
}
.legal {
  max-width: 820px;
  padding-bottom: 8px;
}
.legal h2 {
  font-size: 1.24rem;
  margin: 40px 0 12px;
  letter-spacing: -0.012em;
}
.legal h3 {
  font-size: 1rem;
  margin: 26px 0 8px;
}
.legal p,
.legal li {
  color: var(--fg-2);
  font-size: 0.92rem;
  line-height: 1.78;
}
.legal p {
  margin: 0 0 14px;
}
.legal ul,
.legal ol {
  margin: 0 0 16px;
  padding-left: 22px;
}
.legal li {
  margin-bottom: 8px;
}
.legal strong {
  color: var(--fg);
}
.legal a {
  color: var(--brand-2);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.legal .callout {
  margin: 22px 0;
  padding: 18px 20px;
  border: 1px solid rgba(255, 122, 0, 0.32);
  border-left-width: 3px;
  border-radius: 10px;
  background: rgba(255, 122, 0, 0.07);
}
.legal .callout p:last-child {
  margin: 0;
}
.legal table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 18px;
  font-size: 0.87rem;
}
.legal th,
.legal td {
  padding: 11px 14px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  color: var(--fg-2);
  vertical-align: top;
}
.legal thead th {
  background: rgba(255, 255, 255, 0.035);
  color: var(--fg);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.legal-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 26px;
  color: var(--fg-3);
  font-size: 0.85rem;
}
.legal-back:hover {
  color: var(--brand-2);
}
.legal-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 44px 0 0;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}
.legal-nav a {
  padding: 8px 15px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--fg-2);
  font-size: 0.82rem;
  text-decoration: none;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}
.legal-nav a:hover {
  border-color: var(--brand);
  color: var(--brand-2);
  background: var(--brand-soft);
}

@media (max-width: 860px) {
  .flow-grid,
  .price-grid {
    grid-template-columns: 1fr;
  }
  .legal-head {
    padding-top: 122px;
  }
  .price-notes {
    padding: 18px;
  }
}


/* ==========================================================================
   25. 格式区紧凑排版（30 种 RAW 并排时不至于太高）
   ========================================================================== */
.formats--compact {
  gap: 9px;
}
.formats--compact .chip {
  padding: 9px 4px;
  font-size: 0.72rem;
  letter-spacing: 0.02em;
}

/* ==========================================================================
   26. 精度说明提示块
   ========================================================================== */
.note-callout {
  display: flex;
  gap: 18px;
  margin-top: 22px;
  padding: 26px 28px;
  border: 1px solid rgba(255, 122, 0, 0.3);
  border-left: 3px solid var(--brand);
  border-radius: var(--r-md);
  background: linear-gradient(120deg, rgba(255, 122, 0, 0.08), rgba(255, 122, 0, 0.02));
}
.note-icon {
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  width: 40px;
  height: 40px;
  border-radius: 11px;
  border: 1px solid rgba(255, 122, 0, 0.36);
  background: rgba(255, 122, 0, 0.12);
  color: var(--brand-2);
}
.note-icon svg {
  width: 20px;
  height: 20px;
}
.note-callout h3 {
  margin: 0 0 8px;
  font-size: 1rem;
}
.note-callout p {
  margin: 0;
  color: var(--fg-2);
  font-size: 0.89rem;
  line-height: 1.68;
}

@media (max-width: 560px) {
  .note-callout {
    padding: 20px 18px;
    gap: 14px;
  }
  .note-icon {
    width: 34px;
    height: 34px;
  }
}


/* ==========================================================================
   27. AI 引擎区示意图（纯 CSS/SVG 绘制，无任何第三方素材，无版权风险）
   ========================================================================== */
.panel-visual {
  position: relative;
  flex: 1 1 auto;
  min-height: 200px;
  background:
    radial-gradient(120% 150% at 50% 0%, rgba(255, 122, 0, 0.12), transparent 62%),
    linear-gradient(180deg, rgba(9, 15, 25, 0.85), rgba(6, 11, 20, 0.95));
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}
.panel-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 34px 34px;
  mask-image: radial-gradient(ellipse 70% 80% at 50% 50%, #000 20%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 70% 80% at 50% 50%, #000 20%, transparent 75%);
  pointer-events: none;
}
.pv {
  position: absolute;
  inset: 0;
  margin: 0;
  padding: 0;
  display: block;
  opacity: 0;
  transition: opacity 0.5s var(--ease);
  pointer-events: none;
  color: var(--brand-2);
}
.pv.is-active {
  opacity: 1;
  pointer-events: auto;
}

/* 实拍示意图
   注意：面板是高约 210px、宽约 850px 的超宽横条，
   16:9 的照片若满铺会被裁掉一半，所以这里居中限宽 + 左右渐隐，
   让照片像打在暗场里，边缘柔和过渡到背景。 */
.pv-img {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: min(100%, 620px);
  height: 100%;
  object-fit: cover;
  object-position: center 42%;
  transition: width 1.1s var(--ease), transform 1.4s var(--ease);
  -webkit-mask-image: linear-gradient(90deg, transparent 0%, #000 9%, #000 91%, transparent 100%);
  mask-image: linear-gradient(90deg, transparent 0%, #000 9%, #000 91%, transparent 100%);
}
.pv.is-active .pv-img {
  transform: translateX(-50%) scale(1.02);
}

/* 曝光三联图本身是宽构图，满铺显示三格完整 */
.pv--wide .pv-img {
  left: 0;
  transform: none;
  width: 100%;
  object-position: center center;
  -webkit-mask-image: none;
  mask-image: none;
}
.pv--wide.is-active .pv-img {
  transform: scale(1.02);
}

/* 上下压暗，保证角标可读，并让图片与深色页面融合 */
.pv::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(
    180deg,
    rgba(6, 11, 20, 0.55) 0%,
    rgba(6, 11, 20, 0.05) 30%,
    rgba(6, 11, 20, 0.15) 62%,
    rgba(6, 11, 20, 0.88) 100%
  );
  pointer-events: none;
}
.pv figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 12px;
  z-index: 2;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
  padding: 0 14px;
}
.pv-tag {
  padding: 3px 9px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.35);
  color: var(--fg-3);
  font-family: var(--f-mono);
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.pv-tag--ok {
  border-color: rgba(255, 122, 0, 0.5);
  color: var(--brand-2);
}
.pv-tag--warn {
  border-color: rgba(140, 160, 190, 0.35);
  color: #93a7bd;
}

/* 27.1 清晰度：左清晰右拖影 */
.pv-sharp {
  position: relative;
  display: flex;
  width: 100%;
  max-width: 460px;
  height: 96px;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--line);
}
.pv-pane {
  position: relative;
  flex: 1 1 50%;
  overflow: hidden;
  background: linear-gradient(135deg, #1b2b40, #0d1726 60%, #24303f);
}
.pv-tex {
  position: absolute;
  inset: -10%;
  background-image: repeating-linear-gradient(48deg, rgba(255, 255, 255, 0.16) 0 1px, transparent 1px 5px),
    repeating-linear-gradient(-52deg, rgba(255, 180, 90, 0.14) 0 1px, transparent 1px 7px);
}
.pv-pane--blur .pv-tex {
  filter: blur(3.2px);
  transform: translateX(6px) scale(1.06);
}
.pv-pane--blur {
  opacity: 0.9;
}
.pv-pane--crisp::after {
  content: "";
  position: absolute;
  inset: 0;
  box-shadow: inset 0 0 0 1px rgba(255, 122, 0, 0.35);
}

/* 27.2 曝光：欠曝 / 正常 / 过曝 三拼 */
.pv-exp {
  display: flex;
  width: 100%;
  max-width: 460px;
  height: 96px;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--line);
}
.pv-seg {
  position: relative;
  flex: 1 1 33.33%;
  display: grid;
  place-items: end center;
  padding-bottom: 8px;
}
.pv-seg b {
  font-family: var(--f-mono);
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.72);
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.9);
}
.pv-seg--under {
  background: linear-gradient(150deg, #05080d, #0b1520 60%, #101c2a);
  box-shadow: inset -20px 0 34px -18px rgba(0, 0, 0, 0.9);
}
.pv-seg--ok {
  background: linear-gradient(155deg, #2d4a63 0%, #4e6d7f 38%, #a8834f 72%, #d9b072 100%);
}
.pv-seg--over {
  background: linear-gradient(150deg, #f2f4f6, #e8ecf0 55%, #ffffff);
}
.pv-seg--over b {
  color: #4a5560;
  text-shadow: none;
}

/* 27.3 眼睛：对焦环 + 检测框 */
.pv-eye {
  position: relative;
  width: 100%;
  max-width: 420px;
  height: 96px;
  display: grid;
  place-items: center;
}
.pv-eye svg {
  width: 100%;
  height: 100%;
  color: rgba(255, 178, 82, 0.9);
}
.pv-box {
  position: absolute;
  width: 96px;
  height: 62px;
  border: 1.5px solid rgba(255, 122, 0, 0.75);
  border-radius: 4px;
  box-shadow: 0 0 18px rgba(255, 122, 0, 0.22);
}
.pv-box::before,
.pv-box::after {
  content: "";
  position: absolute;
  width: 9px;
  height: 9px;
  border: 2px solid var(--brand);
}
.pv-box::before {
  top: -2px;
  left: -2px;
  border-right: 0;
  border-bottom: 0;
}
.pv-box::after {
  bottom: -2px;
  right: -2px;
  border-left: 0;
  border-top: 0;
}

/* 27.4 相似度：三张重叠的连拍 */
.pv-sim {
  position: relative;
  width: 100%;
  max-width: 420px;
  height: 96px;
  display: grid;
  place-items: center;
}
.pv-frame {
  position: absolute;
  width: 104px;
  height: 70px;
  border: 1.5px solid rgba(255, 255, 255, 0.22);
  border-radius: 7px;
  background: linear-gradient(150deg, rgba(46, 74, 99, 0.85), rgba(14, 24, 38, 0.95));
}
.pv-frame:nth-child(1) {
  transform: translateX(-38px) rotate(-6deg) scale(0.92);
  opacity: 0.55;
}
.pv-frame:nth-child(2) {
  transform: translateX(0) scale(0.97);
  opacity: 0.8;
}
.pv-frame:nth-child(3) {
  transform: translateX(38px) rotate(6deg);
  border-color: rgba(255, 122, 0, 0.6);
  box-shadow: 0 10px 30px -12px rgba(255, 122, 0, 0.55);
}
.pv-badge {
  position: relative;
  z-index: 2;
  margin-left: 120px;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid rgba(255, 122, 0, 0.5);
  background: rgba(10, 16, 26, 0.92);
  color: var(--brand-2);
  font-family: var(--f-mono);
  font-size: 0.7rem;
  font-weight: 700;
}

/* 27.5 笑脸：表情框 + 命中率 */
.pv-smile {
  position: relative;
  width: 100%;
  max-width: 420px;
  height: 96px;
  display: grid;
  place-items: center;
}
.pv-smile svg {
  width: 190px;
  height: 96px;
  color: rgba(255, 178, 82, 0.85);
}
.pv-smile .pv-box {
  width: 118px;
  height: 74px;
}
.pv-smile .pv-badge {
  position: absolute;
  right: 6px;
  bottom: 2px;
  margin-left: 0;
}

/* ==========================================================================
   28. 格式清单（紧凑文本式，替代 43 个标签块）
   ========================================================================== */
.fmt-rows {
  display: grid;
  gap: 14px;
}
.fmt-row {
  display: grid;
  grid-template-columns: 92px 1fr;
  gap: 18px;
  align-items: center;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.022);
  transition: border-color 0.25s, background 0.25s;
}
.fmt-row:hover {
  border-color: rgba(255, 122, 0, 0.34);
  background: rgba(255, 122, 0, 0.045);
}
.fmt-label {
  color: var(--fg-3);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.fmt-list {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 0;
}
.fmt-list span {
  font-family: var(--f-mono);
  font-size: 0.79rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--fg-2);
  transition: color 0.2s;
}
.fmt-list span:hover {
  color: var(--brand-2);
}
.fmt-list span:not(:last-child)::after {
  content: "·";
  margin: 0 8px;
  color: var(--fg-3);
  opacity: 0.55;
}
.fmt-list--raw span {
  font-size: 0.75rem;
  color: var(--fg-3);
}
.fmt-list--raw span:hover {
  color: var(--brand-2);
}
.fmt-note {
  margin: 4px 0 0;
  color: var(--fg-3);
  font-size: 0.82rem;
  line-height: 1.6;
}

@media (max-width: 1080px) {
  .panel-visual {
    min-height: 210px;
  }
}
@media (max-width: 560px) {
  .panel-body {
    padding: 22px 20px 24px;
  }
  .fmt-row {
    grid-template-columns: 1fr;
    gap: 8px;
  }
  .pv-sharp,
  .pv-exp {
    height: 82px;
  }
}