/* ==========================================================================
   Nexify AI 官网样式
   品牌令牌对齐 docs/VIS.html V2.0：色板、字体、圆角、间距、深色区块。
   单浅色主题；深色仅用于页头、Hero 与页脚。
   ========================================================================== */

:root {
  /* 品牌色板 */
  --cyan: #4ec5f5;
  --periwinkle: #7c95f1;
  --purple: #a97bf4;
  --purple-deep: #8b5cf6;
  /* 中性色 */
  --ink: #171a2b;
  --gray-500: #5a6172;
  --gray-400: #9299ac;
  --gray-300: #b9bfcf;
  --line: #e6e8f0;
  --gray-100: #eff1f7;
  --stripe: #fafafc;
  --lavender: #eee9fd;
  --bg: #f5f6fa;
  /* 功能色 */
  --success: #34c77b;
  --error: #f25555;
  --warning: #d97706;
  --info: #0891b2;
  /* 品牌渐变 */
  --gradient-brand: linear-gradient(90deg, #4ec5f5 0%, #7c95f1 50%, #a97bf4 100%);
  /* 字体 */
  --font-latin: 'Poppins', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --font-cn: 'PingFang SC', 'Hiragino Sans GB', 'Source Han Sans SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'SF Mono', ui-monospace, Menlo, Consolas, monospace;
  /* 圆角 */
  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 16px;
  --r-xl: 24px;
  --r-full: 999px;
  /* 间距 */
  --s-1: 8px;
  --s-2: 16px;
  --s-3: 24px;
  --s-4: 32px;
  --s-5: 48px;
  /* 布局 */
  --header-h: 68px;
  --shadow-card: 0 1px 2px rgba(23, 26, 43, 0.04);
  --shadow-lift: 0 16px 40px rgba(23, 26, 43, 0.08);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 20px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-latin), var(--font-cn);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

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

button,
input,
select,
textarea {
  font: inherit;
}

ul,
ol {
  margin: 0;
  padding: 0;
}

h1,
h2,
h3,
h4,
p {
  margin: 0;
}

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 100;
  padding: 10px 16px;
  border-radius: var(--r-sm);
  background: #fff;
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
  transform: translateY(-160%);
  transition: transform 0.18s ease;
}

.skip-link:focus {
  transform: translateY(0);
}

.container {
  width: min(1180px, 100% - 48px);
  margin-inline: auto;
}

/* ==========================================================================
   顶部导航
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(23, 26, 43, 0.9);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-3);
  height: var(--header-h);
}

.brand {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
}

.brand img {
  height: 26px;
  width: auto;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 30px;
}

.site-nav > a:not(.btn) {
  position: relative;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.68);
  transition: color 0.18s ease;
}

.site-nav > a:not(.btn):hover,
.site-nav > a.is-active {
  color: #fff;
}

.site-nav > a.is-active::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: -22px;
  height: 2px;
  border-radius: 2px;
  background: var(--gradient-brand);
}

.nav-cta {
  margin-left: 6px;
}

.nav-toggle {
  position: relative;
  display: none;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--r-md);
  background: rgba(255, 255, 255, 0.04);
  cursor: pointer;
}

.nav-toggle > span:not(.sr-only) {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 16px;
  height: 1.5px;
  margin: 0;
  border-radius: 2px;
  background: #fff;
  transform: translate(-50%, -50%);
  transition: transform 0.18s ease, opacity 0.18s ease;
}

.nav-toggle > span:nth-of-type(2) {
  transform: translate(-50%, calc(-50% - 6px));
}

.nav-toggle > span:nth-of-type(3) {
  transform: translate(-50%, -50%);
}

.nav-toggle > span:nth-of-type(4) {
  transform: translate(-50%, calc(-50% + 6px));
}

.nav-toggle[aria-expanded='true'] > span:nth-of-type(2) {
  transform: translate(-50%, -50%) rotate(45deg);
}

.nav-toggle[aria-expanded='true'] > span:nth-of-type(3) {
  opacity: 0;
}

.nav-toggle[aria-expanded='true'] > span:nth-of-type(4) {
  transform: translate(-50%, -50%) rotate(-45deg);
}

/* ==========================================================================
   按钮
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 40px;
  padding: 0 20px;
  border: 1px solid transparent;
  border-radius: var(--r-md);
  background: transparent;
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
  line-height: 1;
  white-space: nowrap;
  cursor: pointer;
  transition: filter 0.18s ease, box-shadow 0.18s ease, background 0.18s ease,
    border-color 0.18s ease, transform 0.12s ease;
}

.btn:active {
  transform: scale(0.98);
}

.btn-lg {
  height: 48px;
  padding: 0 24px;
  font-size: 15px;
}

.btn-sm {
  height: 32px;
  padding: 0 14px;
  font-size: 13px;
}

.btn-primary {
  background: var(--purple-deep);
  color: #fff;
  box-shadow: 0 8px 20px rgba(139, 92, 246, 0.28);
}

.btn-primary:hover {
  filter: brightness(1.06);
  box-shadow: 0 12px 26px rgba(139, 92, 246, 0.36);
}

.btn-ghost-dark {
  border-color: rgba(255, 255, 255, 0.22);
  background: rgba(255, 255, 255, 0.04);
  color: #fff;
}

.btn-ghost-dark:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.36);
}

.btn-outline {
  border-color: var(--line);
  background: #fff;
  color: var(--ink);
}

.btn-outline:hover {
  border-color: var(--gray-400);
}

.btn-soft {
  background: var(--lavender);
  color: var(--purple-deep);
}

.btn-soft:hover {
  filter: brightness(1.05);
}

.btn[disabled],
.btn[aria-disabled='true'] {
  opacity: 0.55;
  cursor: not-allowed;
  box-shadow: none;
  filter: none;
  transform: none;
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--purple-deep);
  font-size: 14px;
  font-weight: 600;
}

.link-arrow svg {
  transition: transform 0.18s ease;
}

.link-arrow:hover svg {
  transform: translateX(3px);
}

.link-on-dark {
  color: var(--cyan);
}

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

.hero {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: #fff;
  padding: 84px 0 80px;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(600px 320px at 78% 12%, rgba(78, 197, 245, 0.2), transparent 65%),
    radial-gradient(560px 360px at 92% 72%, rgba(169, 123, 244, 0.22), transparent 68%),
    radial-gradient(420px 260px at 8% 92%, rgba(124, 149, 241, 0.16), transparent 70%),
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: auto, auto, auto, 64px 64px, 64px 64px;
  mask-image: linear-gradient(180deg, #000 0%, #000 72%, transparent 100%);
  -webkit-mask-image: linear-gradient(180deg, #000 0%, #000 72%, transparent 100%);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 4px;
  background: var(--gradient-brand);
}

.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.12fr 0.88fr;
  gap: 64px;
  align-items: center;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.hero-eyebrow::before {
  content: '';
  width: 22px;
  height: 2px;
  border-radius: 2px;
  background: var(--gradient-brand);
}

.hero h1 {
  margin: 22px 0 20px;
  font-size: clamp(36px, 4.6vw, 56px);
  line-height: 1.14;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.hl-cyan {
  color: var(--cyan);
}

.hero-lede {
  max-width: 58ch;
  color: rgba(255, 255, 255, 0.62);
  font-size: 16px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: var(--s-4);
}

.hero-facts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 44px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  list-style: none;
}

.hero-facts strong {
  display: block;
  font-size: 13.5px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 4px;
}

.hero-facts span {
  display: block;
  font-size: 12.5px;
  line-height: 1.55;
  color: rgba(255, 255, 255, 0.5);
}

/* 闭环结构示意卡 */
.loop-card {
  position: relative;
  padding: 26px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.045);
  box-shadow: 0 30px 70px rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.loop-head {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 13px;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.82);
}

.loop-head .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gradient-brand);
}

.loop-tag {
  margin-left: auto;
  padding: 3px 9px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--r-full);
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: rgba(255, 255, 255, 0.5);
}

.loop-steps {
  position: relative;
  margin: 22px 0 18px;
  list-style: none;
}

.loop-steps::before {
  content: '';
  position: absolute;
  left: 15px;
  top: 12px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), var(--periwinkle), var(--purple));
  opacity: 0.7;
}

.loop-steps li {
  position: relative;
  padding: 0 0 17px 46px;
}

.loop-steps li:last-child {
  padding-bottom: 0;
}

.loop-steps .idx {
  position: absolute;
  left: 0;
  top: 0;
  display: grid;
  place-items: center;
  width: 31px;
  height: 31px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 50%;
  background: #20243a;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--cyan);
}

.loop-steps b {
  display: block;
  font-size: 13.5px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 2px;
}

.loop-steps small {
  display: block;
  font-size: 12px;
  line-height: 1.55;
  color: rgba(255, 255, 255, 0.5);
}

.loop-foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 7px;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  font-size: 11.5px;
  color: rgba(255, 255, 255, 0.52);
}

.loop-foot span {
  padding: 3px 9px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--r-full);
}

.loop-foot i {
  font-style: normal;
  color: rgba(255, 255, 255, 0.28);
}

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

.page-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: #fff;
  padding: 72px 0 60px;
}

.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(520px 280px at 84% 0%, rgba(78, 197, 245, 0.18), transparent 70%),
    radial-gradient(460px 300px at 96% 90%, rgba(169, 123, 244, 0.18), transparent 70%);
  pointer-events: none;
}

.page-hero::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 4px;
  background: var(--gradient-brand);
}

.page-hero .container {
  position: relative;
  z-index: 1;
}

.page-hero .eyebrow {
  color: var(--cyan);
}

.page-hero h1 {
  margin: 18px 0 16px;
  font-size: clamp(30px, 3.8vw, 44px);
  line-height: 1.2;
  font-weight: 700;
  letter-spacing: -0.015em;
}

.page-hero p {
  max-width: 72ch;
  color: rgba(255, 255, 255, 0.62);
  font-size: 16px;
  line-height: 1.78;
}

.page-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 26px;
}

.page-hero-meta span {
  padding: 5px 12px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--r-sm);
  font-size: 12px;
  color: rgba(255, 255, 255, 0.6);
  background: rgba(255, 255, 255, 0.05);
}

.page-hero-meta b {
  color: var(--cyan);
  font-weight: 600;
}

/* ==========================================================================
   通用区块
   ========================================================================== */

.section {
  padding: 88px 0;
}

.section-tight {
  padding: 64px 0;
}

.section-white {
  background: #fff;
  border-block: 1px solid var(--line);
}

.section-head {
  max-width: 780px;
  margin-bottom: 44px;
}

.section-head.center {
  margin-inline: auto;
  text-align: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--purple-deep);
}

.eyebrow::before {
  content: '';
  width: 24px;
  height: 2px;
  border-radius: 2px;
  background: var(--gradient-brand);
}

.section-head.center .eyebrow::before {
  display: none;
}

.section-title {
  margin: 14px 0 14px;
  font-size: clamp(26px, 3vw, 36px);
  line-height: 1.26;
  font-weight: 700;
  letter-spacing: -0.015em;
}

.section-desc {
  color: var(--gray-500);
  font-size: 16px;
  line-height: 1.8;
}

.section-desc + .section-desc {
  margin-top: 10px;
}

.section-foot {
  margin-top: 36px;
}

/* ==========================================================================
   栅格与卡片
   ========================================================================== */

.grid {
  display: grid;
  gap: 20px;
}

.grid-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.card {
  position: relative;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: #fff;
  box-shadow: var(--shadow-card);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.card:hover {
  transform: translateY(-2px);
  border-color: #d9dce8;
  box-shadow: var(--shadow-lift);
}

.card-icon {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  margin-bottom: 18px;
  border-radius: var(--r-md);
  background: var(--lavender);
  color: var(--purple-deep);
}

.card-icon svg {
  width: 21px;
  height: 21px;
}

.card h3 {
  margin: 0 0 8px;
  font-size: 18px;
  line-height: 1.45;
  font-weight: 600;
}

.card p {
  color: var(--gray-500);
  font-size: 14px;
  line-height: 1.72;
}

.card-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.card-head h3 {
  margin: 0;
}

.card .pill {
  flex-shrink: 0;
  margin-top: 2px;
}

.card-list {
  display: grid;
  gap: 8px;
  margin-top: 16px;
  list-style: none;
}

.card-list li {
  position: relative;
  padding-left: 18px;
  color: var(--gray-500);
  font-size: 13px;
  line-height: 1.65;
}

.card-list li::before {
  content: '';
  position: absolute;
  left: 2px;
  top: 0.6em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--periwinkle);
}

.card-dark {
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(255, 255, 255, 0.12);
  color: #fff;
  box-shadow: none;
}

.card-dark:hover {
  border-color: rgba(255, 255, 255, 0.22);
  box-shadow: none;
}

.card-dark p,
.card-dark .card-list li {
  color: rgba(255, 255, 255, 0.58);
}

.card-dark .card-list li::before {
  background: var(--cyan);
}

/* 标签 */
.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 24px;
  padding: 0 10px;
  border-radius: var(--r-sm);
  font-size: 12px;
  font-weight: 600;
  line-height: 1;
  white-space: nowrap;
}

.pill::before {
  content: '';
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.7;
}

.pill-ok {
  background: #e7f7ef;
  color: #1e8a55;
}

.pill-part {
  background: #fdf3e3;
  color: #9a5b08;
}

.pill-plan {
  background: var(--lavender);
  color: var(--purple-deep);
}

.pill-mute {
  background: var(--gray-100);
  color: var(--gray-500);
}

.pill-dark {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.14);
  color: rgba(255, 255, 255, 0.7);
}

/* ==========================================================================
   流程
   ========================================================================== */

.process {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 18px;
  counter-reset: step;
}

.process-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.process-step {
  position: relative;
}

.process-step::before {
  content: '';
  position: absolute;
  top: 22px;
  left: 46px;
  right: -18px;
  height: 1px;
  background: linear-gradient(90deg, rgba(124, 149, 241, 0.45), rgba(169, 123, 244, 0.15));
}

.process-step:last-child::before {
  display: none;
}

.process-num {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  margin-bottom: 16px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 4px 12px rgba(23, 26, 43, 0.06);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--purple-deep);
}

.process-step h3 {
  margin-bottom: 6px;
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1.45;
}

.process-step p {
  color: var(--gray-500);
  font-size: 13px;
  line-height: 1.7;
}

/* ==========================================================================
   深色区块
   ========================================================================== */

.dark-band {
  position: relative;
  overflow: hidden;
  padding: 56px;
  border-radius: var(--r-xl);
  background: var(--ink);
  color: #fff;
}

.dark-band::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(480px 260px at 90% 8%, rgba(78, 197, 245, 0.16), transparent 70%),
    radial-gradient(420px 280px at 6% 96%, rgba(169, 123, 244, 0.16), transparent 70%);
  pointer-events: none;
}

.dark-band > * {
  position: relative;
  z-index: 1;
}

.dark-band .eyebrow {
  color: var(--cyan);
}

.dark-band .section-title {
  color: #fff;
}

.dark-band .section-desc {
  color: rgba(255, 255, 255, 0.6);
}

.principles {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 16px;
  margin-top: 36px;
}

.principle {
  padding: 22px 18px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--r-md);
  background: rgba(255, 255, 255, 0.03);
}

.principle .num {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.principle h3 {
  margin: 12px 0 6px;
  font-size: 14.5px;
  font-weight: 600;
  line-height: 1.45;
}

.principle p {
  color: rgba(255, 255, 255, 0.55);
  font-size: 12.5px;
  line-height: 1.65;
}

/* ==========================================================================
   行业
   ========================================================================== */

.industry-card {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.industry-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.industry-top h3 {
  margin: 0;
  font-size: 18px;
  font-weight: 600;
}

.industry-top .idx {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--gray-400);
  letter-spacing: 0.08em;
}

.industry-table {
  display: grid;
  gap: 0;
  width: 100%;
  font-size: 13px;
  border-top: 1px solid var(--line);
}

.industry-row {
  display: grid;
  grid-template-columns: 76px 1fr;
  gap: 10px;
  padding: 9px 0;
  border-bottom: 1px solid var(--line);
}

.industry-row:last-child {
  border-bottom: 0;
}

.industry-row dt {
  color: var(--gray-400);
  font-size: 12px;
  line-height: 1.6;
}

.industry-row dd {
  margin: 0;
  color: var(--gray-500);
  line-height: 1.6;
}

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

.industry-tags span {
  padding: 3px 8px;
  border-radius: 6px;
  background: var(--gray-100);
  color: var(--gray-500);
  font-size: 11.5px;
}

/* ==========================================================================
   列表、提示、表格
   ========================================================================== */

.check-list {
  display: grid;
  gap: 10px;
  list-style: none;
}

.check-list li {
  position: relative;
  padding-left: 24px;
  color: var(--gray-500);
  font-size: 14px;
  line-height: 1.7;
}

.check-list li::before {
  content: '';
  position: absolute;
  left: 3px;
  top: 0.62em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gradient-brand);
}

.check-list b {
  color: var(--ink);
  font-weight: 600;
}

.callout {
  padding: 18px 22px;
  border-left: 4px solid var(--purple-deep);
  border-radius: var(--r-sm);
  background: var(--lavender);
  color: var(--ink);
  font-size: 14px;
  line-height: 1.75;
}

.callout b {
  font-weight: 600;
}

.callout-warn {
  border-left-color: var(--warning);
  background: #fdf3e3;
}

.callout-info {
  border-left-color: var(--info);
  background: #e4f5fc;
}

.callout-neutral {
  border-left-color: var(--gray-300);
  background: var(--gray-100);
  color: var(--gray-500);
}

.callout a {
  color: inherit;
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* 间距工具类（只保留真实复用的值） */
.mt-8 {
  margin-top: 8px;
}

.mt-24 {
  margin-top: 24px;
}

.mt-28 {
  margin-top: 28px;
}

.mb-0 {
  margin-bottom: 0;
}

.mb-24 {
  margin-bottom: 24px;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: #fff;
}

.data-table {
  width: 100%;
  min-width: 680px;
  border-collapse: collapse;
  font-size: 14px;
}

.data-table th {
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  background: var(--gray-100);
  color: var(--gray-500);
  font-size: 12px;
  font-weight: 600;
  text-align: left;
  white-space: nowrap;
}

.data-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  color: var(--gray-500);
  vertical-align: top;
  line-height: 1.65;
}

.data-table tbody tr:last-child td {
  border-bottom: 0;
}

.data-table td:first-child {
  color: var(--ink);
  font-weight: 600;
  white-space: nowrap;
}

.table-note {
  margin-top: 12px;
  color: var(--gray-400);
  font-size: 12px;
}

/* ==========================================================================
   分节导航（产品能力页）
   ========================================================================== */

.subnav {
  position: sticky;
  top: var(--header-h);
  z-index: 40;
  border-bottom: 1px solid var(--line);
  background: rgba(245, 246, 250, 0.94);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.subnav-inner {
  display: flex;
  align-items: center;
  gap: 26px;
  height: 52px;
  overflow-x: auto;
  scrollbar-width: none;
  white-space: nowrap;
}

.subnav-inner::-webkit-scrollbar {
  display: none;
}

.subnav a {
  font-size: 13.5px;
  color: var(--gray-500);
  transition: color 0.18s ease;
}

.subnav a:hover {
  color: var(--purple-deep);
}

/* 能力详情 */
.capability {
  scroll-margin-top: calc(var(--header-h) + 72px);
}

.capability + .capability {
  margin-top: 72px;
}

.capability-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
}

.capability-head h2 {
  font-size: clamp(24px, 2.6vw, 30px);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.capability-lede {
  max-width: 74ch;
  color: var(--gray-500);
  font-size: 15px;
  line-height: 1.8;
  margin-bottom: 28px;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 20px;
}

.panel {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: #fff;
}

.panel-title {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 16px;
  font-size: 14px;
  font-weight: 600;
}

.panel-title .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gradient-brand);
}

.panel-note {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
  color: var(--gray-400);
  font-size: 12.5px;
  line-height: 1.7;
}

/* ==========================================================================
   下载页
   ========================================================================== */

.price-card {
  display: flex;
  flex-direction: column;
  gap: 18px;
  height: 100%;
}

.platform-head {
  display: flex;
  align-items: center;
  gap: 14px;
}

.platform-icon {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: var(--r-md);
  background: var(--ink);
  color: #fff;
}

.platform-icon svg {
  width: 22px;
  height: 22px;
}

.platform-head h3 {
  margin: 0;
  font-size: 17px;
}

.platform-head span {
  display: block;
  color: var(--gray-400);
  font-size: 12.5px;
}

.version-meta {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.version-meta div {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
  font-size: 13px;
}

.version-meta dt {
  color: var(--gray-400);
}

.version-meta dd {
  margin: 0;
  color: var(--ink);
  font-weight: 500;
}

.price-card .btn {
  margin-top: auto;
}

.faq-list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.faq-item {
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

.faq-item h3 {
  margin-bottom: 8px;
  font-size: 15.5px;
  font-weight: 600;
}

.faq-item p {
  color: var(--gray-500);
  font-size: 14px;
  line-height: 1.75;
}

/* ==========================================================================
   关于与协议
   ========================================================================== */

.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 24px;
  align-items: start;
}

.info-list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.info-row {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 14px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
}

.info-row dt {
  color: var(--gray-400);
}

.info-row dd {
  margin: 0;
  color: var(--ink);
  line-height: 1.65;
  word-break: break-word;
}

.info-row a {
  color: var(--purple-deep);
  font-weight: 600;
}

.legal-layout {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 40px;
  align-items: start;
}

.legal-toc {
  position: sticky;
  top: calc(var(--header-h) + 24px);
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: #fff;
  font-size: 13px;
}

.legal-toc h2 {
  margin-bottom: 12px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--gray-400);
  text-transform: uppercase;
}

.legal-toc ol {
  display: grid;
  gap: 8px;
  padding-left: 18px;
  color: var(--gray-500);
}

.legal-toc a:hover {
  color: var(--purple-deep);
}

.legal-body {
  padding: 40px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: #fff;
}

.legal-body h2 {
  margin: 36px 0 12px;
  font-size: 19px;
  font-weight: 600;
  line-height: 1.45;
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.legal-body h2:first-of-type {
  margin-top: 0;
}

.legal-body p {
  color: var(--gray-500);
  font-size: 14.5px;
  line-height: 1.85;
  margin-bottom: 12px;
}

.legal-body ul {
  display: grid;
  gap: 8px;
  margin: 0 0 14px;
  padding-left: 20px;
  color: var(--gray-500);
  font-size: 14.5px;
  line-height: 1.8;
}

.legal-body li::marker {
  color: var(--periwinkle);
}

.legal-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
  color: var(--gray-400);
  font-size: 12.5px;
}

.legal-body a {
  color: var(--purple-deep);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.legal-note {
  margin-top: 24px;
  color: var(--gray-400);
  font-size: 13px;
}

/* ==========================================================================
   CTA 区块
   ========================================================================== */

.cta-band {
  position: relative;
  overflow: hidden;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  padding: 56px;
  border-radius: var(--r-xl);
  background: var(--ink);
  color: #fff;
}

.cta-band::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(460px 240px at 88% 10%, rgba(78, 197, 245, 0.18), transparent 70%),
    radial-gradient(400px 260px at 4% 100%, rgba(169, 123, 244, 0.18), transparent 70%);
  pointer-events: none;
}

.cta-band > * {
  position: relative;
  z-index: 1;
}

.cta-band h2 {
  margin-bottom: 10px;
  font-size: clamp(24px, 2.8vw, 32px);
  line-height: 1.3;
  font-weight: 700;
}

.cta-band p {
  max-width: 60ch;
  color: rgba(255, 255, 255, 0.6);
  font-size: 14.5px;
  line-height: 1.75;
}

.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ==========================================================================
   页脚
   ========================================================================== */

.site-footer {
  margin-top: 88px;
  padding: 56px 0 28px;
  background: var(--ink);
  color: #fff;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.7fr repeat(3, 1fr);
  gap: 36px;
}

.footer-brand img {
  height: 26px;
  width: auto;
  margin-bottom: 16px;
}

.footer-brand p {
  max-width: 34ch;
  color: rgba(255, 255, 255, 0.5);
  font-size: 13px;
  line-height: 1.75;
}

.site-footer h2 {
  margin-bottom: 14px;
  color: rgba(255, 255, 255, 0.42);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.footer-links {
  display: grid;
  gap: 10px;
  font-size: 13.5px;
  color: rgba(255, 255, 255, 0.64);
}

.footer-links a:hover {
  color: #fff;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 44px;
  padding-top: 22px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  color: rgba(255, 255, 255, 0.42);
  font-size: 12px;
}

.footer-bottom .legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.footer-bottom a:hover {
  color: #fff;
}

/* ==========================================================================
   动效
   ========================================================================== */

.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .reveal,
  .reveal.is-visible {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .card,
  .btn,
  .link-arrow svg {
    transition: none;
  }
}

/* ==========================================================================
   响应式
   ========================================================================== */

@media (max-width: 1080px) {
  .hero-grid {
    gap: 44px;
  }

  .hero-facts {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }

  .principles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .footer-grid {
    grid-template-columns: 1.5fr repeat(3, 1fr);
    gap: 28px;
  }
}

@media (max-width: 960px) {
  .hero {
    padding: 64px 0;
  }

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

  .hero-visual {
    max-width: 540px;
  }

  .process {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 28px 20px;
  }

  .process-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .process-step::before {
    display: none;
  }

  .grid-3,
  .grid-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .split,
  .about-grid {
    grid-template-columns: 1fr;
  }

  .legal-layout {
    grid-template-columns: 1fr;
  }

  .legal-toc {
    position: static;
  }

  .dark-band,
  .cta-band {
    padding: 40px;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 860px) {
  :root {
    --header-h: 60px;
  }

  .brand img {
    height: 23px;
  }

  .nav-toggle {
    display: block;
  }

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: var(--header-h);
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 10px 24px 22px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    background: #171a2b;
    box-shadow: 0 24px 40px rgba(0, 0, 0, 0.35);
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav > a:not(.btn) {
    padding: 13px 0;
    font-size: 15px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.07);
  }

  .site-nav > a.is-active::after {
    display: none;
  }

  .nav-cta {
    margin: 16px 0 0;
  }

  .subnav {
    top: var(--header-h);
  }

  .section {
    padding: 64px 0;
  }

  .section-head {
    margin-bottom: 32px;
  }

  .page-hero {
    padding: 56px 0 48px;
  }

  .principles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .cta-band {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 640px) {
  .container {
    width: calc(100% - 32px);
  }

  .hero {
    padding: 52px 0 56px;
  }

  .hero h1 {
    font-size: clamp(30px, 8vw, 40px);
  }

  .hero-lede {
    font-size: 15px;
  }

  .hero-actions .btn {
    flex: 1 1 auto;
  }

  .hero-facts {
    grid-template-columns: 1fr;
    gap: 14px;
    margin-top: 32px;
  }

  .hero-facts li {
    display: flex;
    align-items: baseline;
    gap: 10px;
  }

  .hero-facts strong {
    margin: 0;
    flex-shrink: 0;
  }

  .loop-card {
    padding: 20px;
  }

  .principles,
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

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

  .process-3 {
    grid-template-columns: 1fr;
  }

  .dark-band,
  .cta-band {
    padding: 28px 22px;
    border-radius: var(--r-lg);
  }

  .card,
  .panel {
    padding: 22px;
  }

  .cta-actions {
    width: 100%;
    flex-direction: column;
  }

  .cta-actions .btn {
    width: 100%;
  }

  .page-hero-meta {
    gap: 6px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .footer-brand {
    grid-column: auto;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }

  .legal-body {
    padding: 24px 20px;
  }

  .info-row {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .section {
    padding: 52px 0;
  }

  .capability + .capability {
    margin-top: 52px;
  }
}