/* ==========================================================================
   Inkpad — 站点公共样式（移动端优先 / 全新视觉风格）
   ========================================================================== */

/* ---------- 设计令牌 ---------- */
:root {
  --bg: #f6f6fb;
  --bg-deco-1: rgba(109, 74, 255, .16);
  --bg-deco-2: rgba(18, 181, 201, .16);
  --bg-deco-3: rgba(255, 93, 143, .12);

  --surface: #ffffff;
  --surface-2: #f1f2f9;
  --surface-3: #e8eaf4;

  --ink: #13141c;
  --ink-2: #5a6072;
  --ink-3: #8c91a4;

  --line: rgba(19, 20, 28, .09);
  --line-2: rgba(19, 20, 28, .16);

  --brand-1: #6d4aff;
  --brand-2: #12b5c9;
  --brand-3: #ff5d8f;
  --grad: linear-gradient(115deg, var(--brand-1) 0%, var(--brand-2) 100%);
  --grad-soft: linear-gradient(115deg, rgba(109, 74, 255, .12), rgba(18, 181, 201, .12));

  --radius-xs: 9px;
  --radius-sm: 13px;
  --radius: 20px;
  --radius-lg: 28px;

  --shadow-1: 0 1px 2px rgba(20, 20, 60, .05), 0 6px 16px -8px rgba(20, 20, 60, .14);
  --shadow-2: 0 24px 60px -28px rgba(30, 20, 90, .35), 0 4px 14px -6px rgba(20, 20, 60, .12);
  --shadow-inset: inset 0 1px 0 rgba(255, 255, 255, .6);

  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
    "Liberation Mono", "Courier New", monospace;

  --header-h: 60px;
  --ease: cubic-bezier(.22, .8, .28, 1);
}

[data-theme="dark"] {
  --bg: #08090e;
  --bg-deco-1: rgba(139, 107, 255, .22);
  --bg-deco-2: rgba(47, 208, 224, .18);
  --bg-deco-3: rgba(255, 93, 143, .14);

  --surface: #12141d;
  --surface-2: #191c27;
  --surface-3: #222633;

  --ink: #eef0f7;
  --ink-2: #a3a9bd;
  --ink-3: #71768a;

  --line: rgba(255, 255, 255, .09);
  --line-2: rgba(255, 255, 255, .18);

  --brand-1: #8b6bff;
  --brand-2: #2fd0e0;
  --grad-soft: linear-gradient(115deg, rgba(139, 107, 255, .16), rgba(47, 208, 224, .14));

  --shadow-1: 0 1px 2px rgba(0, 0, 0, .5), 0 8px 22px -12px rgba(0, 0, 0, .7);
  --shadow-2: 0 30px 70px -30px rgba(0, 0, 0, .9), 0 4px 16px -8px rgba(0, 0, 0, .6);
  --shadow-inset: inset 0 1px 0 rgba(255, 255, 255, .05);
}

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

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

body {
  margin: 0;
  min-height: 100%;
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.68;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
body.nav-open { overflow: hidden; }

/* 背景装饰光斑 */
body::before {
  content: "";
  position: fixed;
  inset: -30vh -30vw auto -30vw;
  height: 95vh;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(38% 46% at 22% 34%, var(--bg-deco-1), transparent 72%),
    radial-gradient(34% 44% at 82% 22%, var(--bg-deco-2), transparent 70%),
    radial-gradient(30% 40% at 55% 82%, var(--bg-deco-3), transparent 70%);
  filter: blur(12px);
}

h1, h2, h3, h4 { margin: 0; font-weight: 800; line-height: 1.18; letter-spacing: -.028em; }
p { margin: 0 0 1em; }
a { color: var(--brand-1); text-decoration: none; }
a:hover { text-decoration: underline; }
button { font: inherit; color: inherit; }
img, svg { max-width: 100%; }
:focus-visible { outline: 2.5px solid var(--brand-1); outline-offset: 3px; border-radius: 6px; }
::selection { background: color-mix(in srgb, var(--brand-1) 30%, transparent); }

/* ---------- 布局 ---------- */
.wrap { width: 100%; max-width: 1140px; margin: 0 auto; padding: 0 20px; }
.section { padding: 64px 0; }
.section--tight { padding: 44px 0; }
.section--panel { background: var(--surface); border-block: 1px solid var(--line); }

.head { max-width: 660px; margin-bottom: 32px; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 11.5px; font-weight: 800; letter-spacing: .18em; text-transform: uppercase;
  color: var(--brand-1); margin-bottom: 14px;
}
.eyebrow::before {
  content: ""; width: 20px; height: 2px; border-radius: 2px; background: var(--grad);
}
.title-xl { font-size: clamp(27px, 6.4vw, 44px); }
.title-md { font-size: clamp(21px, 4.6vw, 30px); }
.lead { color: var(--ink-2); font-size: clamp(15.5px, 3.6vw, 18px); margin: 12px 0 0; }
.grad-text {
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}

/* ---------- 顶部导航（移动优先：抽屉式） ---------- */
.site-header {
  position: sticky; top: 0; z-index: 80;
  height: var(--header-h);
  display: flex; align-items: center;
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: saturate(170%) blur(16px);
  border-bottom: 1px solid var(--line);
}
.site-header__inner {
  width: 100%; display: flex; align-items: center; gap: 12px;
}
.brand {
  display: inline-flex; align-items: center; gap: 9px;
  font-weight: 800; letter-spacing: -.02em; color: var(--ink); font-size: 16px;
  flex: none;
}
.brand:hover { text-decoration: none; }
.brand__mark {
  width: 32px; height: 32px; border-radius: 10px; flex: none;
  background: var(--grad); color: #fff;
  display: grid; place-items: center;
  box-shadow: var(--shadow-1), var(--shadow-inset);
}

.nav-toggle {
  margin-left: 6px;
  width: 40px; height: 40px; flex: none;
  display: grid; place-items: center;
  border: 1px solid var(--line-2); border-radius: var(--radius-xs);
  background: var(--surface); cursor: pointer;
}
.nav-toggle span {
  display: block; width: 17px; height: 1.8px; border-radius: 2px;
  background: var(--ink); position: relative;
}
.nav-toggle span::before, .nav-toggle span::after {
  content: ""; position: absolute; left: 0; width: 17px; height: 1.8px;
  border-radius: 2px; background: var(--ink);
}
.nav-toggle span::before { top: -5.5px; }
.nav-toggle span::after { top: 5.5px; }

.site-menu {
  position: fixed; inset: var(--header-h) 0 0; z-index: 79;
  padding: 20px;
  background: color-mix(in srgb, var(--bg) 96%, transparent);
  backdrop-filter: blur(18px);
  display: flex; flex-direction: column; gap: 4px;
  animation: slideDown .22s var(--ease);
}
.site-menu[hidden] { display: none; }
@keyframes slideDown { from { opacity: 0; transform: translateY(-10px); } }
.site-menu a {
  padding: 15px 16px; border-radius: var(--radius-sm);
  color: var(--ink); font-weight: 700; font-size: 17px;
  border: 1px solid transparent;
}
.site-menu a:hover { background: var(--surface); border-color: var(--line); text-decoration: none; }
.site-menu a[aria-current="page"] { background: var(--grad-soft); border-color: var(--line); }
.site-menu .site-menu__cta { margin-top: 12px; }

.header-actions { display: none; align-items: center; gap: 10px; }

@media (min-width: 880px) {
  .nav-toggle { display: none; }
  .header-actions { display: flex; margin-left: auto; }
  .site-menu {
    position: static; inset: auto; padding: 0; margin-left: 18px;
    background: none; border: none; backdrop-filter: none;
    flex-direction: row; align-items: center; gap: 2px;
    animation: none; width: auto;
  }
  .site-menu a {
    padding: 8px 14px; font-size: 14.5px; font-weight: 600; color: var(--ink-2);
    border-radius: 999px;
  }
  .site-menu a:hover { background: var(--surface-2); color: var(--ink); }
  .site-menu a[aria-current="page"] { color: var(--ink); background: var(--surface-2); }
  .site-menu .site-menu__cta { display: none; }
}

/* 响应式可见性工具类 */
.only-mobile { display: grid !important; margin-left: auto; }
@media (min-width: 880px) {
  .only-mobile { display: none !important; }
  .hide-lg { display: none !important; }
}

/* 两栏流式列表 */
.cols-2 { display: grid; gap: 12px; }
@media (min-width: 760px) { .cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: 46px; } }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  padding: 12px 22px; border-radius: 999px;
  border: 1px solid transparent;
  font-size: 15px; font-weight: 700; cursor: pointer;
  white-space: nowrap; text-align: center;
  transition: transform .14s var(--ease), box-shadow .18s var(--ease),
    background .18s var(--ease), border-color .18s var(--ease), color .18s var(--ease);
}
.btn:hover { text-decoration: none; transform: translateY(-1.5px); }
.btn:active { transform: translateY(0); }

.btn--primary {
  background: var(--grad); color: #fff;
  box-shadow: 0 12px 26px -12px color-mix(in srgb, var(--brand-1) 70%, transparent);
}
.btn--primary:hover { box-shadow: 0 18px 34px -14px color-mix(in srgb, var(--brand-1) 80%, transparent); }
.btn--ghost {
  background: var(--surface); color: var(--ink); border-color: var(--line-2);
  box-shadow: var(--shadow-1);
}
.btn--ghost:hover { background: var(--surface-2); }
.btn--block { width: 100%; }
.btn--lg { padding: 15px 28px; font-size: 16px; }

.icon-btn {
  width: 40px; height: 40px; flex: none;
  display: grid; place-items: center;
  border: 1px solid var(--line-2); border-radius: var(--radius-xs);
  background: var(--surface); color: var(--ink-2); cursor: pointer;
  transition: background .16s var(--ease), color .16s var(--ease);
}
.icon-btn:hover { background: var(--surface-2); color: var(--ink); }

/* ---------- Hero ---------- */
.hero { padding: 46px 0 52px; position: relative; }
@media (min-width: 880px) { .hero { padding: 74px 0 80px; } }

.hero__badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 15px 7px 9px; border-radius: 999px; margin-bottom: 22px;
  background: var(--surface); border: 1px solid var(--line);
  box-shadow: var(--shadow-1);
  font-size: 12.5px; font-weight: 700; color: var(--ink-2);
}
.hero__badge i {
  width: 20px; height: 20px; border-radius: 50%; background: var(--grad);
  display: grid; place-items: center; flex: none;
}
.hero__badge i::after { content: ""; width: 6px; height: 6px; border-radius: 50%; background: #fff; }

.hero h1 { font-size: clamp(38px, 12vw, 76px); letter-spacing: -.045em; margin-bottom: 14px; }
.hero__desc { font-size: clamp(16px, 4.2vw, 19px); color: var(--ink-2); max-width: 560px; }
.hero__cta { display: flex; flex-wrap: wrap; gap: 11px; margin-top: 26px; }
.hero__cta .btn { flex: 1 1 200px; }
@media (min-width: 560px) { .hero__cta .btn { flex: 0 0 auto; } }
.hero__meta {
  margin-top: 20px; display: flex; flex-wrap: wrap; gap: 8px 18px;
  font-size: 13.5px; color: var(--ink-3); font-weight: 600;
}
.hero__meta span { display: inline-flex; align-items: center; gap: 7px; }
.hero__meta svg { color: var(--brand-2); flex: none; }

/* Hero 预览窗口 */
.preview {
  margin-top: 34px;
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-2);
  overflow: hidden;
}
@media (min-width: 880px) { .preview { margin-top: 44px; } }
.preview__bar {
  display: flex; align-items: center; gap: 7px;
  padding: 11px 14px; border-bottom: 1px solid var(--line);
  background: var(--surface-2);
}
.preview__dot { width: 10px; height: 10px; border-radius: 50%; background: var(--line-2); flex: none; }
.preview__dot:nth-child(1) { background: #ff5f57; }
.preview__dot:nth-child(2) { background: #febc2e; }
.preview__dot:nth-child(3) { background: #28c840; }
.preview__name {
  margin-left: 8px; font-size: 12.5px; font-weight: 700; color: var(--ink-3);
  font-family: var(--mono);
}
.preview__body {
  padding: 16px 16px 20px;
  font-family: var(--mono); font-size: 13px; line-height: 1.85;
  color: var(--ink-2);
  white-space: pre-wrap; word-break: break-word;
  min-height: 168px;
}
@media (min-width: 880px) { .preview__body { padding: 22px 24px 26px; font-size: 14px; } }
.preview__body .h { color: var(--ink); font-weight: 700; }
.preview__body .c-1 { color: var(--brand-1); }
.preview__body .c-2 { color: var(--brand-2); }
.preview__body .c-3 { color: var(--brand-3); }
.preview__foot {
  display: flex; flex-wrap: wrap; gap: 10px 20px;
  padding: 11px 16px; border-top: 1px solid var(--line);
  background: var(--surface-2);
  font-size: 12px; font-weight: 600; color: var(--ink-3);
}
.preview__foot b { color: var(--ink); }
.preview__foot .ok { color: #16a34a; }
.preview__caret {
  display: inline-block; width: 8px; height: 15px; vertical-align: -3px;
  background: var(--brand-1); margin-left: 1px;
  animation: blink 1.05s steps(2, start) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

/* ---------- 数据条 ---------- */
.stats {
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1px;
  background: var(--line); border: 1px solid var(--line);
  border-radius: var(--radius); overflow: hidden;
}
@media (min-width: 760px) { .stats { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
.stats div { background: var(--surface); padding: 18px 16px; }
.stats b { display: block; font-size: clamp(21px, 5vw, 27px); letter-spacing: -.03em; }
.stats small { color: var(--ink-3); font-size: 12.5px; font-weight: 600; }

/* ---------- Bento 卡片 ---------- */
.bento { display: grid; gap: 14px; }
@media (min-width: 700px) { .bento { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; } }
@media (min-width: 1020px) { .bento { grid-template-columns: repeat(6, minmax(0, 1fr)); } }

.tile {
  position: relative;
  padding: 22px 20px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-1);
  overflow: hidden;
  transition: transform .22s var(--ease), box-shadow .22s var(--ease), border-color .22s var(--ease);
}
.tile:hover { transform: translateY(-3px); box-shadow: var(--shadow-2); border-color: var(--line-2); }
.tile h3 { font-size: 17px; margin-bottom: 7px; letter-spacing: -.02em; }
.tile p { margin: 0; color: var(--ink-2); font-size: 14.5px; }
.tile__icon {
  width: 40px; height: 40px; border-radius: 12px; margin-bottom: 15px;
  display: grid; place-items: center;
  background: var(--grad-soft); color: var(--brand-1);
  border: 1px solid var(--line);
}
@media (min-width: 1020px) {
  .tile--lg { grid-column: span 3; }
  .tile--md { grid-column: span 2; }
  .tile--sm { grid-column: span 2; }
  .tile--wide { grid-column: span 6; }
}
.tile--accent {
  background: var(--grad); border-color: transparent;
  box-shadow: 0 20px 44px -20px color-mix(in srgb, var(--brand-1) 70%, transparent);
}
.tile--accent h3, .tile--accent p { color: #fff; }
.tile--accent p { color: rgba(255, 255, 255, .88); }
.tile--accent .tile__icon { background: rgba(255, 255, 255, .2); border-color: rgba(255, 255, 255, .28); color: #fff; }

/* ---------- 步骤 ---------- */
.steps { display: grid; gap: 12px; }
@media (min-width: 760px) { .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; } }
@media (min-width: 1020px) { .steps { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
.step {
  position: relative; padding: 20px;
  border-radius: var(--radius); background: var(--surface);
  border: 1px solid var(--line); box-shadow: var(--shadow-1);
}
.step__n {
  display: inline-grid; place-items: center;
  width: 30px; height: 30px; border-radius: 10px; margin-bottom: 13px;
  background: var(--grad); color: #fff;
  font-size: 13.5px; font-weight: 800;
}
.step h3 { font-size: 15.5px; margin-bottom: 5px; }
.step p { margin: 0; color: var(--ink-2); font-size: 14px; }

/* ---------- 清单 ---------- */
.checklist { list-style: none; padding: 0; margin: 0; display: grid; gap: 11px; }
.checklist li { position: relative; padding-left: 30px; color: var(--ink-2); font-size: 15px; }
.checklist li::before {
  content: ""; position: absolute; left: 0; top: .45em;
  width: 17px; height: 17px; border-radius: 50%;
  background: var(--grad-soft); border: 1px solid var(--line-2);
}
.checklist li::after {
  content: ""; position: absolute; left: 5px; top: .78em;
  width: 7px; height: 4px; border-left: 2px solid var(--brand-1);
  border-bottom: 2px solid var(--brand-1); transform: rotate(-45deg);
}
.checklist li strong { color: var(--ink); }

/* ---------- 链接列表 ---------- */
.link-list {
  list-style: none; padding: 0; margin: 0;
  display: grid; gap: 10px;
}
@media (min-width: 760px) { .link-list { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.link-list a {
  display: flex; align-items: center; gap: 14px;
  padding: 17px 18px; border-radius: var(--radius);
  background: var(--surface); border: 1px solid var(--line);
  box-shadow: var(--shadow-1); color: var(--ink);
  transition: transform .18s var(--ease), box-shadow .18s var(--ease), border-color .18s var(--ease);
}
.link-list a:hover { text-decoration: none; transform: translateY(-2px); box-shadow: var(--shadow-2); border-color: var(--line-2); }
.link-list .lk-icon {
  width: 38px; height: 38px; border-radius: 11px; flex: none;
  display: grid; place-items: center;
  background: var(--grad-soft); color: var(--brand-1); border: 1px solid var(--line);
}
.link-list strong { display: block; font-size: 15.5px; font-weight: 700; }
.link-list small { display: block; color: var(--ink-3); font-size: 13px; line-height: 1.5; }
.link-list .lk-arrow { margin-left: auto; color: var(--ink-3); flex: none; }

/* ---------- 兼容性 / 标签 ---------- */
.pills { display: flex; flex-wrap: wrap; gap: 9px; }
.pills span {
  padding: 9px 15px; border-radius: 999px;
  background: var(--surface); border: 1px solid var(--line);
  box-shadow: var(--shadow-1);
  font-size: 13.5px; font-weight: 650; color: var(--ink-2);
}

/* ---------- 提示块 ---------- */
.callout {
  display: flex; gap: 14px; align-items: flex-start;
  padding: 18px 19px; border-radius: var(--radius);
  background: var(--grad-soft); border: 1px solid var(--line-2);
  font-size: 14.5px;
}
.callout svg { flex: none; color: var(--brand-1); margin-top: 3px; }
.callout p:last-child { margin-bottom: 0; color: var(--ink-2); }
.callout strong { color: var(--ink); }

/* ---------- 正文文档 ---------- */
.doc { max-width: 760px; }
.doc h2 { font-size: clamp(22px, 5vw, 30px); margin: 0 0 14px; }
.doc h3 { font-size: 18px; margin: 30px 0 10px; }
.doc p, .doc li { color: var(--ink-2); }
.doc ul, .doc ol { padding-left: 22px; }
.doc li { margin-bottom: 7px; }
.doc code {
  font-family: var(--mono); font-size: .88em; padding: 2px 7px; border-radius: 6px;
  background: var(--surface-2); border: 1px solid var(--line); color: var(--ink);
}
.doc pre {
  font-family: var(--mono); font-size: 13.5px; line-height: 1.7;
  background: var(--surface); border: 1px solid var(--line);
  box-shadow: var(--shadow-1);
  padding: 16px 18px; border-radius: var(--radius-sm); overflow-x: auto;
}
.doc pre code { background: none; border: none; padding: 0; }
.doc kbd {
  font-family: var(--mono); font-size: 12.5px; padding: 3px 8px; border-radius: 7px;
  background: var(--surface); border: 1px solid var(--line-2);
  border-bottom-width: 2px; color: var(--ink); white-space: nowrap;
  box-shadow: var(--shadow-inset);
}
.doc table { width: 100%; border-collapse: collapse; font-size: 14.5px; }
.doc th, .doc td { text-align: left; padding: 11px 12px; border-bottom: 1px solid var(--line); }
.doc th { font-size: 11.5px; text-transform: uppercase; letter-spacing: .09em; color: var(--ink-3); }
.doc td:first-child { color: var(--ink); }

.crumb { font-size: 13.5px; color: var(--ink-3); margin-bottom: 16px; }
.crumb a { color: var(--ink-2); font-weight: 600; }

/* ---------- 页脚 ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  background: var(--surface);
  padding: 40px 0 54px;
  font-size: 14px; color: var(--ink-3);
}
.site-footer__top {
  display: flex; flex-wrap: wrap; gap: 22px; justify-content: space-between;
  padding-bottom: 22px; border-bottom: 1px solid var(--line);
}
.site-footer nav { display: flex; flex-wrap: wrap; gap: 10px 20px; }
.site-footer a { color: var(--ink-2); font-weight: 600; }
.site-footer a:hover { color: var(--ink); }
.site-footer__bottom { padding-top: 20px; display: flex; flex-wrap: wrap; gap: 10px; justify-content: space-between; }

/* ---------- 进场动画 ---------- */
.reveal { opacity: 0; transform: translateY(18px); }
.reveal.is-in { opacity: 1; transform: none; transition: opacity .6s var(--ease), transform .6s var(--ease); }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; }
  * { animation-duration: .001ms !important; transition-duration: .001ms !important; }
}

/* ---------- 打印 ---------- */
@media print {
  .site-header, .site-footer, .btn, .no-print { display: none !important; }
  body { background: #fff; color: #000; }
  body::before { display: none; }
}