/* ==========================================================================
   ai77.cn —— 全站样式
   设计取向：技术站 + 文档风，深蓝主色 + 青色强调，浅色主题
   ========================================================================== */

:root {
  /* 品牌主色取自站点 LOGO（assets/logo.png 主色 #F6B502） */
  --logo:      #f6b502;
  --logo-dk:   #d99700;
  --logo-lt:   #fef6e0;

  --brand:      #1d4ed8;
  --brand-dk:   #1e3a8a;
  --brand-lt:   #eff6ff;
  --accent:     #0891b2;
  --accent-lt:  #ecfeff;
  --ink:        #0f172a;
  --ink-2:      #334155;
  --ink-3:      #64748b;
  --line:       #e2e8f0;
  --line-2:     #cbd5e1;
  --bg:         #f6f8fb;
  --card:       #ffffff;
  --ok:         #15803d;
  --warn:       #b45309;
  --err:        #b91c1c;

  --rad:   12px;
  --rad-s: 8px;
  --sh:    0 1px 2px rgba(15,23,42,.05), 0 4px 16px rgba(15,23,42,.05);
  --sh-h:  0 2px 6px rgba(15,23,42,.08), 0 12px 32px rgba(15,23,42,.10);

  --wrap: 1180px;
  --topH: 60px;

  --font: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial,
          "Noto Sans SC", system-ui, sans-serif;
  --mono: "SF Mono", Consolas, "JetBrains Mono", Menlo, monospace;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

img { max-width: 100%; height: auto; }

h1, h2, h3, h4 { line-height: 1.35; margin: 0 0 .5em; font-weight: 700; }
h1 { font-size: 30px; letter-spacing: -.4px; }
h2 { font-size: 22px; letter-spacing: -.2px; }
h3 { font-size: 17px; }
h4 { font-size: 15px; }
p  { margin: 0 0 1em; }

/* ---------------- 布局 ---------------- */

.wrap {
  width: min(var(--wrap), 100% - 40px);
  margin-inline: auto;
}

.top {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.88);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}

.top-in {
  height: var(--topH);
  display: flex; align-items: center; gap: 28px;
}

.logo {
  display: flex; align-items: center; gap: 9px;
  font-size: 19px; font-weight: 800; color: var(--ink);
  letter-spacing: -.5px; flex: 0 0 auto;
}
.logo:hover { text-decoration: none; }
.logo img {
  width: 30px; height: 30px; border-radius: 7px;
  display: block; flex: 0 0 auto;
}
.logo .ai {
  background: linear-gradient(135deg, var(--logo-dk), var(--logo));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.logo .dot { color: var(--logo); }

.nav {
  display: flex; gap: 2px; flex: 1 1 auto;
  overflow-x: auto; scrollbar-width: none;
}
.nav::-webkit-scrollbar { display: none; }

.nav a {
  padding: 7px 13px; border-radius: var(--rad-s);
  color: var(--ink-2); font-size: 14px; font-weight: 500;
  white-space: nowrap; transition: .15s;
}
.nav a:hover { background: var(--brand-lt); color: var(--brand-dk); text-decoration: none; }
.nav a.on { background: var(--brand); color: #fff; }

.top-cta {
  flex: 0 0 auto; display: flex; align-items: center; gap: 10px;
}

main { padding: 28px 0 64px; min-height: calc(100vh - var(--topH)); }

/* ---------------- 页头 ---------------- */

.hero {
  background:
    radial-gradient(1100px 380px at 12% -10%, #dbeafe 0%, transparent 60%),
    radial-gradient(900px 340px at 88% 0%, #cffafe 0%, transparent 62%),
    linear-gradient(180deg, #fff 0%, var(--bg) 100%);
  border-bottom: 1px solid var(--line);
  padding: 46px 0 40px;
  margin-bottom: 28px;
}
.hero h1 { font-size: 34px; margin-bottom: 12px; }
.hero .sub { font-size: 16px; color: var(--ink-2); max-width: 780px; margin-bottom: 20px; }
.hero .meta { display: flex; flex-wrap: wrap; gap: 10px 22px; font-size: 13px; color: var(--ink-3); }

.pill {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 11px; border-radius: 999px;
  background: #fff; border: 1px solid var(--line-2);
  font-size: 12.5px; color: var(--ink-2); font-weight: 500;
  white-space: nowrap;
}
.pill.b  { background: var(--brand-lt); border-color: #bfdbfe; color: var(--brand-dk); }
.pill.c  { background: var(--accent-lt); border-color: #a5f3fc; color: #0e7490; }
.pill.g  { background: #f0fdf4; border-color: #bbf7d0; color: var(--ok); }

/* ---------------- 卡片 ---------------- */

.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--rad); box-shadow: var(--sh);
}
.card-p { padding: 20px 22px; }

.grid { display: grid; gap: 16px; }
.g2 { grid-template-columns: repeat(2, 1fr); }
.g3 { grid-template-columns: repeat(3, 1fr); }
.g4 { grid-template-columns: repeat(4, 1fr); }

/* grid/flex 子项默认 min-width:auto，长英文或不换行文本会撑破容器。
   统一归零，让文本正常换行 —— 这是横向溢出最常见的根因 */
.grid > *, .expn-wrap > * { min-width: 0; }

.sec { margin-bottom: 34px; }
.sec-h {
  display: flex; align-items: center; gap: 12px;
  margin-bottom: 16px; flex-wrap: wrap;
}
.sec-h h2 { margin: 0; }
.sec-h .bar {
  width: 4px; height: 22px; border-radius: 2px;
  background: linear-gradient(180deg, var(--brand), var(--accent));
  flex: 0 0 auto;
}
.sec-h .more { margin-left: auto; font-size: 13.5px; }

/* ---------------- 按钮 ---------------- */

.btn {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 9px 17px; border-radius: var(--rad-s);
  border: 1px solid var(--line-2); background: #fff; color: var(--ink);
  font-size: 14px; font-weight: 600; font-family: inherit;
  cursor: pointer; transition: .15s; white-space: nowrap;
}
.btn:hover { border-color: var(--brand); color: var(--brand-dk); text-decoration: none; }
.btn:active { transform: scale(.98); }
.btn.pri { background: var(--brand); border-color: var(--brand); color: #fff; }
.btn.pri:hover { background: var(--brand-dk); border-color: var(--brand-dk); color: #fff; }
.btn.sm { padding: 6px 12px; font-size: 13px; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

/* ---------------- 表单控件 ---------------- */

.inp, .sel {
  padding: 8px 12px; border: 1px solid var(--line-2);
  border-radius: var(--rad-s); background: #fff;
  font-size: 16px; /* ≥16px 防 iOS 聚焦缩放 */
  font-family: inherit; color: var(--ink);
  transition: .15s; min-height: 40px;
}
.inp:focus, .sel:focus {
  outline: none; border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(29,78,216,.12);
}

.seg { display: inline-flex; background: #eef2f7; border-radius: var(--rad-s); padding: 3px; gap: 2px; flex-wrap: wrap; }
.seg button {
  padding: 7px 15px; border: 0; background: transparent;
  border-radius: 6px; font-size: 14px; font-weight: 600;
  color: var(--ink-2); cursor: pointer; font-family: inherit;
  transition: .15s; white-space: nowrap;
}
.seg button:hover { color: var(--brand-dk); }
.seg button.on { background: #fff; color: var(--brand-dk); box-shadow: var(--sh); }

/* ---------------- 表格 ---------------- */

.tbl-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
table.tbl { width: 100%; border-collapse: collapse; font-size: 14px; }
table.tbl th, table.tbl td {
  padding: 10px 13px; text-align: left;
  border-bottom: 1px solid var(--line); vertical-align: top;
}
table.tbl th {
  background: #f1f5f9; font-weight: 700; color: var(--ink-2);
  font-size: 13px; white-space: nowrap;
  position: sticky; top: 0; z-index: 1;
}
table.tbl tbody tr:hover { background: #fafbfc; }
table.tbl tbody tr:last-child td { border-bottom: 0; }

/* ---------------- 标签 ---------------- */

.tag {
  display: inline-block; padding: 2px 9px; border-radius: 5px;
  font-size: 12px; font-weight: 600; line-height: 1.7;
  background: #f1f5f9; color: var(--ink-2);
}
.tag.b { background: var(--brand-lt); color: var(--brand-dk); }
.tag.c { background: var(--accent-lt); color: #0e7490; }
.tag.g { background: #f0fdf4; color: var(--ok); }
.tag.o { background: #fff7ed; color: var(--warn); }
.tag.r { background: #fef2f2; color: var(--err); }

/* ---------------- 提示条 ---------------- */

.note {
  padding: 13px 16px; border-radius: var(--rad-s);
  border-left: 3px solid var(--accent);
  background: var(--accent-lt); font-size: 14px;
  color: #155e75; margin-bottom: 18px;
}
.note.w { border-color: var(--warn); background: #fffbeb; color: #92400e; }
.note.d { border-color: var(--brand); background: var(--brand-lt); color: var(--brand-dk); }

/* ---------------- 统计 ---------------- */

.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.stat {
  background: #fff; border: 1px solid var(--line);
  border-radius: var(--rad); padding: 15px 17px;
}
.stat .n {
  font-size: 27px; font-weight: 800; line-height: 1.2;
  color: var(--brand-dk); font-family: var(--mono);
}
.stat .l { font-size: 13px; color: var(--ink-3); margin-top: 2px; }

/* ---------------- 代码块 ---------------- */

pre {
  background: #0f172a; color: #e2e8f0;
  padding: 15px 17px; border-radius: var(--rad-s);
  overflow-x: auto; font-family: var(--mono);
  font-size: 13px; line-height: 1.7; margin: 0 0 16px;
}
pre code { font-family: inherit; }
code.inl {
  background: #f1f5f9; padding: 1.5px 6px;
  border-radius: 4px; font-family: var(--mono);
  font-size: 13px; color: #be123c;
}

/* ---------------- 步骤 ---------------- */

.steps { counter-reset: s; }
.step {
  position: relative; padding: 0 0 22px 44px;
  counter-increment: s;
}
.step::before {
  content: counter(s);
  position: absolute; left: 0; top: 0;
  width: 28px; height: 28px; border-radius: 50%;
  background: var(--brand); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 14px; font-weight: 700;
}
.step::after {
  content: ''; position: absolute; left: 13.5px; top: 32px; bottom: 4px;
  width: 1px; background: var(--line-2);
}
.step:last-child { padding-bottom: 0; }
.step:last-child::after { display: none; }
.step h4 { margin-bottom: 4px; }
.step p:last-child { margin-bottom: 0; }

/* ---------------- 页脚 ---------------- */

.foot {
  border-top: 1px solid var(--line);
  background: #fff; padding: 26px 0;
  font-size: 13.5px; color: var(--ink-3);
}
.foot-in { display: flex; flex-wrap: wrap; gap: 14px 28px; align-items: center; }
.foot-in .links { display: flex; flex-wrap: wrap; gap: 16px; }
.foot-in .cp { margin-left: auto; }

/* ---------------- 载入/空态 ---------------- */

.load, .empty {
  text-align: center; padding: 46px 20px; color: var(--ink-3);
}
.load::after {
  content: ''; display: block; width: 26px; height: 26px;
  margin: 14px auto 0; border-radius: 50%;
  border: 3px solid var(--line); border-top-color: var(--brand);
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------------- 响应式 ---------------- */

@media (max-width: 980px) {
  .g4 { grid-template-columns: repeat(2, 1fr); }
  .g3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 760px) {
  body { font-size: 14.5px; }
  .wrap { width: min(var(--wrap), 100% - 28px); }
  .top-in { height: auto; min-height: var(--topH); flex-wrap: wrap; padding: 9px 0; gap: 8px 14px; }
  .logo { font-size: 17px; }
  .nav { order: 3; width: 100%; padding-bottom: 2px; }
  .top-cta { margin-left: auto; }
  .hero { padding: 30px 0 26px; }
  .hero h1 { font-size: 25px; }
  .hero .sub { font-size: 14.5px; }
  h1 { font-size: 24px; }
  h2 { font-size: 19px; }
  .g2, .g3, .g4 { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stat .n { font-size: 22px; }
  main { padding: 20px 0 48px; }
  .foot-in .cp { margin-left: 0; width: 100%; }
}

@media (max-width: 420px) {
  .stats { grid-template-columns: 1fr 1fr; }
  .card-p { padding: 16px; }
  /* 长名字的锚点条目（如「鹏城信息AI · 文件整理专家」）不能把页面撑破 */
  .expn a { max-width: 78vw; overflow: hidden; text-overflow: ellipsis; }
  .expn a .dot-k { display: none; }
}

/* iOS 安全区 + 无 hover 反馈 */
@supports (padding: max(0px)) {
  .top { padding-top: env(safe-area-inset-top); }
  .foot { padding-bottom: calc(26px + env(safe-area-inset-bottom)); }
}
button:active, .btn:active, a:active { filter: brightness(.94); }

@media print {
  * { -webkit-print-color-adjust: exact; print-color-adjust: exact; }
  .top, .foot, .no-print { display: none !important; }
  .sbox, .sbox-back { display: none !important; }
}

/* ==========================================================================
   全站搜索（Ctrl/⌘ + K）
   ========================================================================== */

/* 顶栏唤起按钮 */
.top-search {
  flex: 0 0 auto; display: flex; align-items: center;
  height: 32px; padding: 0 11px; gap: 7px;
  border: 1px solid var(--line-2); border-radius: var(--rad-s);
  background: #fff; color: var(--ink-3);
  font-size: 13px; font-family: inherit; cursor: pointer;
  transition: .15s; white-space: nowrap;
}
.top-search:hover { border-color: var(--brand); color: var(--brand-dk); background: var(--brand-lt); }
.top-search .ico { font-size: 14px; line-height: 1; }
.top-search kbd {
  font-family: var(--mono); font-size: 11px;
  padding: 1.5px 5px; border-radius: 4px;
  background: #f1f5f9; border: 1px solid var(--line);
  color: var(--ink-3);
}
@media (max-width: 900px) { .top-search span.lb, .top-search kbd { display: none; } }
@media (max-width: 760px) {
  .top-search { order: 2; width: 34px; padding: 0; justify-content: center; }
  .top-search .lb, .top-search kbd { display: none; }
}

/* 弹层 */
.sbox-back {
  position: fixed; inset: 0; z-index: 200;
  background: rgba(15,23,42,.42);
  backdrop-filter: blur(3px); -webkit-backdrop-filter: blur(3px);
  display: none; padding: 8vh 16px 16px;
}
.sbox-back.on { display: block; }
.sbox {
  max-width: 640px; margin: 0 auto;
  background: #fff; border-radius: 14px;
  box-shadow: 0 20px 60px rgba(15,23,42,.28);
  overflow: hidden; display: flex; flex-direction: column;
  max-height: 78vh;
}
.sbox-in {
  display: flex; align-items: center; gap: 10px;
  padding: 14px 16px; border-bottom: 1px solid var(--line);
}
.sbox-in input {
  flex: 1 1 auto; min-width: 0;
  border: 0; outline: none; background: transparent;
  font-size: 17px; font-family: inherit; color: var(--ink);
}
.sbox-in input::placeholder { color: var(--ink-3); }
.sbox-in .esc {
  font-size: 11.5px; color: var(--ink-3); font-family: var(--mono);
  padding: 2px 6px; border: 1px solid var(--line-2); border-radius: 4px;
  flex: 0 0 auto;
}
.sbox-res {
  padding: 8px 16px; font-size: 12.5px; color: var(--ink-3);
  border-bottom: 1px solid var(--line); background: #fafbfc;
}
.sbox-list { overflow-y: auto; padding: 6px; }
.sbox-item {
  display: block; padding: 10px 12px; border-radius: 9px;
  color: inherit; transition: .12s;
}
.sbox-item:hover, .sbox-item.sel { background: var(--brand-lt); text-decoration: none; }
.sbox-item .h {
  font-size: 14px; font-weight: 600; color: var(--ink);
  line-height: 1.5;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
  overflow: hidden;
}
.sbox-item .d {
  font-size: 12.5px; color: var(--ink-3); margin-top: 2px; line-height: 1.6;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
  overflow: hidden;
}
.sbox-item .m {
  display: inline-block; margin-top: 5px;
  font-size: 11px; color: var(--brand-dk);
  background: #fff; border: 1px solid #bfdbfe;
  border-radius: 4px; padding: 1px 6px;
}
.sbox-item mark { background: #fef08a; color: inherit; padding: 0 1px; border-radius: 2px; }
.sbox-empty { padding: 34px 16px; text-align: center; color: var(--ink-3); font-size: 14px; }
.sbox-foot {
  padding: 8px 14px; border-top: 1px solid var(--line);
  background: #fafbfc; font-size: 11.5px; color: var(--ink-3);
  display: flex; gap: 14px; flex-wrap: wrap;
}
.sbox-foot kbd {
  font-family: var(--mono); font-size: 10.5px;
  padding: 1px 5px; border-radius: 4px;
  background: #fff; border: 1px solid var(--line);
}

/* 新闻列表加个 RSS 入口样式 */
.rss-chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 12px; border-radius: var(--rad-s);
  border: 1px solid var(--line-2); background: #fff;
  font-size: 13px; font-weight: 600; color: var(--ink-2);
}
.rss-chip:hover { border-color: #f97316; color: #ea580c; text-decoration: none; }