/* 离线格式转换器官网 · 全站样式（纯 CSS，无外部依赖） */

:root {
  --brand: #1677ff;
  --brand-deep: #0b3fa8;
  --brand-light: #4fabff;
  --brand-soft: #eaf3ff;
  --ink: #0f1c33;
  --ink-2: #5a6577;
  --line: #e9edf4;
  --bg: #f6f8fc;
  --surface: #ffffff;
  --gold: #ffa928;
  --radius-lg: 22px;
  --radius: 14px;
  --shadow-sm: 0 6px 18px rgba(15, 35, 80, 0.06);
  --shadow-md: 0 18px 44px rgba(15, 35, 80, 0.1);
  --max: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--brand);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--brand-deep);
}

.container {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 22px;
}

.narrow {
  max-width: 820px;
}

/* ---------- 顶栏 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(255, 255, 255, 0.86);
  border-bottom: 1px solid var(--line);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 18px;
  min-height: 66px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.2px;
}

.brand:hover {
  color: var(--ink);
}

.brand img {
  display: block;
  width: 34px;
  height: 34px;
}

.site-nav {
  display: flex;
  gap: 22px;
  margin-left: auto;
  font-size: 14.5px;
}

.site-nav a {
  color: var(--ink-2);
  font-weight: 500;
}

.site-nav a:hover {
  color: var(--brand);
}

.header-cta {
  margin-left: 4px;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 22px;
  border: 1px solid transparent;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.2;
  white-space: nowrap;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-sm {
  padding: 9px 18px;
  font-size: 14px;
}

.btn-lg {
  padding: 14px 30px;
  font-size: 16px;
  border-radius: 14px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--brand) 0%, var(--brand-deep) 100%);
  color: #fff;
  box-shadow: 0 10px 24px rgba(22, 119, 255, 0.28);
}

.btn-primary:hover {
  color: #fff;
  box-shadow: 0 14px 30px rgba(22, 119, 255, 0.34);
}

.btn-ghost {
  border-color: rgba(255, 255, 255, 0.55);
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.2);
  color: #fff;
}

.btn-outline {
  border-color: #d5dded;
  background: #fff;
  color: var(--ink);
}

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

.btn-white {
  background: #fff;
  color: var(--brand-deep);
  box-shadow: 0 10px 24px rgba(6, 24, 60, 0.18);
}

.btn-white:hover {
  color: var(--brand-deep);
}

/* ---------- 首屏 ---------- */
.hero {
  position: relative;
  overflow: hidden;
  padding: 74px 0 96px;
  background: linear-gradient(135deg, #0a2f7d 0%, #1256c9 42%, #1677ff 78%, #3fa9ff 100%);
  color: #fff;
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(circle at 82% 18%, rgba(255, 255, 255, 0.28), transparent 42%),
    radial-gradient(circle at 12% 88%, rgba(63, 169, 255, 0.35), transparent 46%),
    linear-gradient(rgba(255, 255, 255, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.07) 1px, transparent 1px);
  background-size: auto, auto, 46px 46px, 46px 46px;
  mask-image: linear-gradient(180deg, #000 0%, rgba(0, 0, 0, 0.35) 100%);
  -webkit-mask-image: linear-gradient(180deg, #000 0%, rgba(0, 0, 0, 0.35) 100%);
}

.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: 48px;
  align-items: center;
}

.eyebrow {
  display: inline-block;
  margin-bottom: 16px;
  padding: 6px 14px;
  border: 1px solid rgba(255, 255, 255, 0.32);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.14);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.6px;
}

.hero h1 {
  margin: 0 0 18px;
  font-size: clamp(28px, 4.4vw, 46px);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: -0.5px;
}

.hero .lead {
  max-width: 34em;
  margin: 0;
  font-size: 16.5px;
  color: rgba(255, 255, 255, 0.9);
}

.hero-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.hero-pills li {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 15px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.16);
  font-size: 13.5px;
}

.hero-pills li::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #8fe3ff;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

/* ---------- 手机模型 ---------- */
.hero-visual {
  display: flex;
  justify-content: center;
}

.phone {
  position: relative;
  width: 268px;
  aspect-ratio: 9 / 18.6;
  padding: 11px;
  border-radius: 38px;
  background: linear-gradient(160deg, #1b2a4a, #060b18);
  box-shadow: 0 40px 70px rgba(3, 14, 40, 0.45), inset 0 0 0 1px rgba(255, 255, 255, 0.12);
}

.phone::after {
  content: "";
  position: absolute;
  top: 22px;
  left: 50%;
  width: 76px;
  height: 6px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.18);
  transform: translateX(-50%);
}

.phone-screen {
  display: flex;
  flex-direction: column;
  gap: 14px;
  height: 100%;
  padding: 34px 16px 18px;
  border-radius: 28px;
  background: linear-gradient(180deg, #ffffff 0%, #eef4ff 100%);
  color: var(--ink);
  overflow: hidden;
}

.mock-head {
  display: flex;
  align-items: center;
  gap: 8px;
}

.mock-dot {
  width: 18px;
  height: 18px;
  border-radius: 6px;
  background: linear-gradient(135deg, var(--brand), var(--brand-deep));
}

.mock-title {
  font-size: 13px;
  font-weight: 700;
}

.mock-tiles {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.mock-tile {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 12px 10px;
  border: 1px solid rgba(22, 119, 255, 0.12);
  border-radius: 12px;
  background: #fff;
  box-shadow: 0 4px 12px rgba(15, 35, 80, 0.06);
}

.mock-tile i {
  width: 22px;
  height: 22px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--brand), var(--brand-light));
}

.mock-tile b {
  display: block;
  width: 76%;
  height: 8px;
  border-radius: 999px;
  background: #e4ebf7;
}

.mock-tile.t-alt i {
  background: linear-gradient(135deg, #7a5cff, #b08bff);
}

.mock-tile.t-alt b {
  width: 58%;
}

.mock-task {
  margin-top: auto;
  padding: 14px;
  border-radius: 14px;
  background: #fff;
  box-shadow: 0 6px 18px rgba(15, 35, 80, 0.08);
}

.mock-task-name {
  display: block;
  font-size: 12px;
  font-weight: 600;
}

.mock-bar {
  display: block;
  height: 8px;
  margin: 10px 0 8px;
  border-radius: 999px;
  background: #e9eefa;
  overflow: hidden;
}

.mock-bar i {
  display: block;
  width: 68%;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--brand), var(--brand-light));
}

.mock-task-pct {
  font-size: 12px;
  font-weight: 700;
  color: var(--brand);
}

/* ---------- 数据条 ---------- */
.stats {
  position: relative;
  margin-top: -46px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  margin: 0;
  padding: 26px 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow-md);
  list-style: none;
}

.stats-grid li {
  padding: 2px 18px;
  text-align: center;
}

.stats-grid li + li {
  border-left: 1px solid var(--line);
}

.stats-grid strong {
  display: block;
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 800;
  color: var(--brand-deep);
  letter-spacing: -0.5px;
}

.stats-grid span {
  display: block;
  margin-top: 2px;
  color: var(--ink-2);
  font-size: 13.5px;
  line-height: 1.5;
}

/* ---------- 通用区块 ---------- */
.section {
  padding: 78px 0;
}

.section-alt {
  background: linear-gradient(180deg, rgba(234, 243, 255, 0.65), rgba(246, 248, 252, 0));
}

.section-title {
  margin: 0 0 12px;
  font-size: clamp(23px, 3vw, 32px);
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: -0.4px;
}

.section-desc {
  max-width: 44em;
  margin: 0 0 34px;
  color: var(--ink-2);
  font-size: 15.5px;
}

.eyebrow-center {
  display: block;
  margin: 0 0 12px;
  color: var(--brand);
  font-size: 13.5px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
}

/* ---------- 功能卡 ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.card {
  padding: 26px 26px 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.card:hover {
  transform: translateY(-3px);
  border-color: #d8e6ff;
  box-shadow: var(--shadow-md);
}

.card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  margin-bottom: 14px;
  border-radius: 13px;
  background: var(--brand-soft);
  color: var(--brand);
}

.card-icon svg {
  display: block;
  width: 22px;
  height: 22px;
}

.card h3 {
  margin: 0 0 12px;
  font-size: 17px;
  font-weight: 700;
}

.card ul {
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--ink-2);
  font-size: 14.5px;
}

.card li {
  position: relative;
  margin: 7px 0;
  padding-left: 18px;
}

.card li::before {
  content: "";
  position: absolute;
  top: 11px;
  left: 2px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--brand-light);
}

/* ---------- 隐私区块 ---------- */
.split {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 44px;
  align-items: center;
}

.check-list {
  margin: 0 0 28px;
  padding: 0;
  list-style: none;
}

.check-list li {
  position: relative;
  margin: 12px 0;
  padding-left: 32px;
  color: var(--ink-2);
  font-size: 15px;
}

.check-list li::before {
  content: "";
  position: absolute;
  top: 4px;
  left: 0;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--brand-soft) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%231677ff' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 13l4 4L19 7'/%3E%3C/svg%3E") center / 13px 13px no-repeat;
}

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

.flow-card {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow-md);
}

.flow-card h3 {
  margin: 0 0 18px;
  font-size: 17px;
  font-weight: 700;
}

.flow {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.flow li {
  position: relative;
  display: flex;
  align-items: center;
  gap: 14px;
  padding-bottom: 20px;
  font-size: 15px;
}

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

.flow li span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  flex: 0 0 30px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--brand), var(--brand-deep));
  color: #fff;
  font-size: 14px;
  font-weight: 700;
}

.flow li:not(:last-child)::before {
  content: "";
  position: absolute;
  top: 32px;
  left: 14px;
  width: 2px;
  height: calc(100% - 26px);
  background: var(--brand-soft);
}

.flow-note {
  margin: 20px 0 0;
  padding-top: 16px;
  border-top: 1px dashed var(--line);
  color: var(--ink-2);
  font-size: 13.5px;
}

/* ---------- 支持格式 ---------- */
.chip-group {
  margin-bottom: 22px;
}

.chip-group h3 {
  margin: 0 0 12px;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink-2);
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.chips li {
  padding: 9px 18px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  font-size: 14.5px;
  font-weight: 600;
  color: var(--brand-deep);
}

/* ---------- 下载区 ---------- */
.cta-band {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
  gap: 36px;
  align-items: center;
  padding: 44px;
  border-radius: 26px;
  background: linear-gradient(135deg, #0a2f7d 0%, #1450c4 55%, #1677ff 100%);
  color: #fff;
  box-shadow: 0 26px 60px rgba(10, 47, 125, 0.28);
}

.cta-band h2 {
  margin: 0 0 12px;
  font-size: clamp(22px, 2.8vw, 30px);
  font-weight: 800;
  letter-spacing: -0.4px;
}

.cta-band p {
  margin: 0;
  color: rgba(255, 255, 255, 0.88);
  font-size: 15px;
}

.cta-note {
  margin-top: 12px !important;
  font-size: 13px !important;
  color: rgba(255, 255, 255, 0.72) !important;
}

.cta-side {
  padding: 24px;
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.1);
}

.cta-label {
  font-size: 13px !important;
}

.cta-qq {
  margin: 6px 0 18px !important;
  font-size: 22px !important;
  font-weight: 800;
  letter-spacing: 1px;
  color: #fff !important;
}

/* ---------- 页脚 ---------- */
.site-footer {
  margin-top: 20px;
  padding: 46px 0 26px;
  background: #0c1526;
  color: rgba(255, 255, 255, 0.68);
  font-size: 13.5px;
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) repeat(2, minmax(0, 0.8fr));
  gap: 32px;
}

.brand-footer {
  color: #fff;
  font-size: 16px;
}

.brand-footer:hover {
  color: #fff;
}

.brand-footer img {
  width: 30px;
  height: 30px;
}

.footer-desc {
  max-width: 30em;
  margin: 14px 0 0;
  line-height: 1.7;
}

.footer-col h4 {
  margin: 0 0 14px;
  color: #fff;
  font-size: 14px;
  font-weight: 700;
}

.footer-col a {
  display: block;
  margin: 9px 0;
  color: rgba(255, 255, 255, 0.68);
}

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

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  align-items: center;
  justify-content: space-between;
  margin-top: 34px;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
  margin: 0;
}

.footer-bottom a {
  color: rgba(255, 255, 255, 0.68);
}

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

/* ---------- 条款页 ---------- */
.article {
  margin: 34px 0 10px;
  padding: 34px 30px 38px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}

.article h1 {
  margin: 0 0 10px;
  font-size: clamp(22px, 2.6vw, 26px);
  font-weight: 800;
  letter-spacing: -0.3px;
}

.article .meta {
  margin-bottom: 22px;
  color: var(--ink-2);
  font-size: 13.5px;
}

.article h2 {
  margin: 28px 0 8px;
  font-size: 17px;
  font-weight: 700;
}

.article p {
  margin: 8px 0;
}

.article ul {
  margin: 8px 0;
  padding-left: 22px;
  color: var(--ink-2);
}

.article li {
  margin: 6px 0;
}

.back-link {
  display: inline-block;
  margin-top: 26px;
  font-size: 14.5px;
  font-weight: 600;
}

/* ---------- 响应式 ---------- */
@media (max-width: 980px) {
  .hero-inner,
  .split,
  .cta-band {
    grid-template-columns: 1fr;
  }

  .hero {
    padding: 52px 0 84px;
  }

  .hero-visual {
    order: -1;
  }

  .phone {
    width: 228px;
  }

  .stats-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 0;
  }

  .stats-grid li:nth-child(3) {
    border-left: 0;
  }

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

@media (max-width: 720px) {
  .site-nav {
    display: none;
  }

  .header-cta {
    margin-left: auto;
  }

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

  .section {
    padding: 56px 0;
  }

  .cta-band {
    padding: 28px 22px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 26px;
  }

  .article {
    padding: 24px 20px 28px;
  }
}