/* youtubegpt.ai — 工具站样式 */

:root {
  --teal: #0D7C6B;
  --teal-ink: #0A6558;
  --teal-soft: #E6F2EF;
  --bg: #FFFFFF;
  --bg-2: #F5F7F6;
  --bg-3: #ECEFED;
  --ink: #14201D;
  --ink-2: #46534F;
  --ink-3: #6E7B77;
  --line: #DCE2E0;
  --line-2: #E8ECEB;
  --warn: #B0442A;
  --warn-soft: #FBEEEA;
  --ok: #0D7C6B;
  --radius: 10px;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --shadow: 0 1px 2px rgba(20, 32, 29, .06), 0 4px 16px rgba(20, 32, 29, .05);
}

@media (prefers-color-scheme: dark) {
  :root {
    --teal: #2FB8A0;
    --teal-ink: #46C7B0;
    --teal-soft: #12211E;
    --bg: #0E1413;
    --bg-2: #141B1A;
    --bg-3: #1B2422;
    --ink: #E6ECEA;
    --ink-2: #AFBCB8;
    --ink-3: #7E8C88;
    --line: #26302E;
    --line-2: #1E2726;
    --warn: #E0764F;
    --warn-soft: #241713;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 4px 16px rgba(0, 0, 0, .25);
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: 860px; margin: 0 auto; padding: 0 20px; }

a { color: var(--teal-ink); text-decoration: underline; text-underline-offset: 2px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--teal); outline-offset: 2px; border-radius: 4px; }

/* ---------- header ---------- */
header {
  border-bottom: 1px solid var(--line);
  background: var(--bg);
  position: sticky; top: 0; z-index: 20;
}
header .wrap {
  display: flex; align-items: center; gap: 18px;
  min-height: 60px; flex-wrap: wrap;
}
.logo {
  display: flex; align-items: center; gap: 9px;
  font-weight: 700; font-size: 17px; color: var(--ink);
  text-decoration: none; letter-spacing: -.01em; white-space: nowrap;
}
.logo img { width: 26px; height: 26px; border-radius: 6px; display: block; }
header nav { display: flex; gap: 16px; flex-wrap: wrap; margin-left: auto; }
header nav a {
  color: var(--ink-2); text-decoration: none; font-size: 14.5px; white-space: nowrap;
}
header nav a:hover { color: var(--teal-ink); }

/* ---------- hero ---------- */
main { padding-bottom: 80px; }
.hero { padding: 44px 0 8px; }
.hero.sub { padding: 30px 0 6px; }
h1 {
  font-size: clamp(28px, 5vw, 40px); line-height: 1.15;
  letter-spacing: -.022em; margin: 0 0 12px; text-wrap: balance;
}
.lede { font-size: 19px; color: var(--ink-2); margin: 0; max-width: 62ch; }
.crumb { font-size: 13.5px; color: var(--ink-3); margin: 0 0 14px; }
.crumb a { color: var(--ink-3); }

/* ---------- 工具 ---------- */
.tool {
  background: var(--bg-2); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 20px; margin: 26px 0 8px;
}
.tool-row { display: flex; gap: 10px; flex-wrap: wrap; }
.tool input[type=url], .tool input[type=text] {
  flex: 1 1 320px; min-width: 0;
  padding: 13px 15px; font-size: 16px; font-family: inherit;
  border: 1px solid var(--line); border-radius: 8px;
  background: var(--bg); color: var(--ink);
}
.tool input::placeholder { color: var(--ink-3); }
.tool input:focus { border-color: var(--teal); outline: none; box-shadow: 0 0 0 3px var(--teal-soft); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  padding: 13px 22px; font-size: 16px; font-weight: 600; font-family: inherit;
  background: var(--teal); color: #fff; border: 1px solid var(--teal);
  border-radius: 8px; cursor: pointer; text-decoration: none; white-space: nowrap;
}
.btn:hover { filter: brightness(1.08); }
.btn:disabled { opacity: .55; cursor: not-allowed; filter: none; }
.btn.ghost { background: transparent; color: var(--ink-2); border-color: var(--line); font-weight: 500; }
.btn.ghost:hover { border-color: var(--teal); color: var(--teal-ink); filter: none; }
.btn.sm { padding: 8px 13px; font-size: 14px; border-radius: 7px; }

.hint { font-size: 13.5px; color: var(--ink-3); margin: 11px 0 0; }

/* 结果区 */
.result { margin-top: 18px; display: none; }
.result.on { display: block; }
.vid-meta {
  display: flex; gap: 13px; align-items: flex-start;
  padding-bottom: 14px; border-bottom: 1px solid var(--line); margin-bottom: 14px;
}
.vid-meta img { width: 108px; border-radius: 7px; display: block; flex: none; }
.vid-meta .t { font-weight: 650; line-height: 1.35; margin: 0 0 3px; font-size: 15.5px; }
.vid-meta .s { font-size: 13.5px; color: var(--ink-3); margin: 0; }

.tabs { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 12px; }
.tab {
  padding: 6px 12px; font-size: 13.5px; font-family: inherit;
  border: 1px solid var(--line); background: var(--bg); color: var(--ink-2);
  border-radius: 999px; cursor: pointer;
}
.tab[aria-selected=true] { background: var(--teal); border-color: var(--teal); color: #fff; font-weight: 600; }

.out {
  background: var(--bg); border: 1px solid var(--line); border-radius: 8px;
  padding: 15px 16px; max-height: 460px; overflow: auto;
  font-size: 14.5px; line-height: 1.72; white-space: pre-wrap; word-break: break-word;
  margin: 0;
}
.out.code { font-family: var(--mono); font-size: 12.5px; white-space: pre; }
.out p { margin: 0 0 15px; }
.out p:last-child { margin: 0; }
.out .ts {
  font-family: var(--mono); font-size: 12px; color: var(--teal-ink);
  text-decoration: none; margin-right: 7px;
}
.acts { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 12px; align-items: center; }
.acts .spacer { flex: 1; }
.count { font-size: 13px; color: var(--ink-3); font-variant-numeric: tabular-nums; }

.err {
  background: var(--warn-soft); border: 1px solid var(--warn);
  color: var(--warn); border-radius: 8px; padding: 13px 15px; font-size: 15px; margin-top: 16px;
}
.err b { display: block; margin-bottom: 3px; }

.spin {
  width: 15px; height: 15px; border: 2px solid rgba(255, 255, 255, .35);
  border-top-color: #fff; border-radius: 50%; animation: sp .7s linear infinite;
}
@keyframes sp { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .spin { animation-duration: 2s; } }

/* ---------- 内容排版 ---------- */
section { margin-top: 40px; }
h2 {
  font-size: clamp(21px, 3.2vw, 26px); line-height: 1.28;
  letter-spacing: -.015em; margin: 0 0 14px; text-wrap: balance;
}
h3 { font-size: 18px; line-height: 1.35; margin: 26px 0 8px; letter-spacing: -.008em; }
p { margin: 0 0 15px; }
ul, ol { margin: 0 0 15px; padding-left: 22px; }
li { margin-bottom: 7px; }
li::marker { color: var(--ink-3); }

.callout {
  background: var(--teal-soft); border-left: 3px solid var(--teal);
  padding: 16px 18px; border-radius: 0 8px 8px 0; margin: 22px 0;
}
.callout h3 { margin: 0 0 7px; font-size: 16.5px; }
.callout p:last-child { margin: 0; }

.steps { list-style: none; padding: 0; counter-reset: s; }
.steps li {
  position: relative; padding-left: 38px; margin-bottom: 14px; counter-increment: s;
}
.steps li::before {
  content: counter(s); position: absolute; left: 0; top: 1px;
  width: 26px; height: 26px; border-radius: 50%;
  background: var(--teal); color: #fff;
  font-size: 13.5px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
}

.tbl-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 8px; margin: 20px 0; }
table { border-collapse: collapse; width: 100%; font-size: 15px; min-width: 460px; }
th, td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--line-2); }
th { background: var(--bg-2); font-size: 13px; font-weight: 650; color: var(--ink-2); }
tr:last-child td { border-bottom: none; }
td.n { font-family: var(--mono); font-variant-numeric: tabular-nums; white-space: nowrap; }

code {
  font-family: var(--mono); font-size: .88em;
  background: var(--bg-3); padding: 2px 6px; border-radius: 4px;
}
pre {
  background: var(--bg-3); border: 1px solid var(--line); border-radius: 8px;
  padding: 14px 16px; overflow-x: auto; font-size: 13px; line-height: 1.6; margin: 16px 0;
}
pre code { background: none; padding: 0; font-size: inherit; }
kbd {
  font-family: var(--mono); font-size: .84em; background: var(--bg-3);
  border: 1px solid var(--line); border-bottom-width: 2px;
  border-radius: 5px; padding: 2px 6px;
}

.faq details {
  border: 1px solid var(--line); border-radius: 8px;
  padding: 14px 16px; margin-bottom: 10px; background: var(--bg-2);
}
.faq summary { font-weight: 620; cursor: pointer; font-size: 16px; }
.faq details[open] summary { margin-bottom: 9px; }
.faq p:last-child { margin: 0; }

.more { display: grid; gap: 11px; grid-template-columns: 1fr; }
@media (min-width: 620px) { .more { grid-template-columns: 1fr 1fr; } }
.more a {
  display: block; padding: 15px 16px; border: 1px solid var(--line);
  border-radius: 8px; text-decoration: none; background: var(--bg-2);
}
.more a:hover { border-color: var(--teal); }
.more b { display: block; color: var(--ink); font-size: 15.5px; margin-bottom: 3px; }
.more span { display: block; color: var(--ink-3); font-size: 13.5px; line-height: 1.5; }

.facts { display: grid; gap: 11px; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); margin: 22px 0; }
.fact { background: var(--bg-2); border: 1px solid var(--line); border-radius: 8px; padding: 13px 15px; }
.fact b { display: block; font-size: 21px; letter-spacing: -.02em; font-variant-numeric: tabular-nums; }
.fact span { display: block; font-size: 13px; color: var(--ink-3); margin-top: 2px; }

.disclaimer {
  font-size: 13.5px; color: var(--ink-3); line-height: 1.6;
  background: var(--bg-2); border: 1px solid var(--line);
  border-radius: 8px; padding: 15px 17px; margin: 0;
}

/* ---------- footer ---------- */
footer {
  border-top: 1px solid var(--line); background: var(--bg-2);
  padding: 28px 0; margin-top: 60px;
}
footer .wrap { display: flex; flex-direction: column; gap: 14px; }
.fnav { display: flex; gap: 16px; flex-wrap: wrap; }
.fnav a { color: var(--ink-2); font-size: 14.5px; text-decoration: none; }
.fnav a:hover { color: var(--teal-ink); }
footer p { font-size: 13.5px; color: var(--ink-3); margin: 0; }

@media (max-width: 560px) {
  body { font-size: 16px; }
  .lede { font-size: 17.5px; }
  header .wrap { padding-top: 10px; padding-bottom: 10px; gap: 8px; }
  header nav { gap: 13px; margin-left: 0; }
  header nav a { font-size: 13.5px; }
  .vid-meta img { width: 78px; }
  .tool { padding: 16px; }
}