/* ==================================================================
   LONGEN · 长链生成器
   两套主题：黑底白字（默认）/ 白底黑字
   ================================================================== */

:root {
  color-scheme: dark;

  --bg: #07080c;
  --glow-a: rgba(94, 234, 212, .10);
  --glow-b: rgba(167, 139, 250, .10);

  --panel-hi: #11151e;
  --panel-lo: #0b0e15;
  --panel-2: #0b0e15;
  --panel-soft: rgba(13, 16, 23, .72);
  --input-bg: #0b0e15;

  --line: #1b2231;
  --line-soft: #151b26;

  --text: #e7eef8;
  --muted: #8a99b1;
  --dim: #5d6b82;
  --faint: #46536a;
  --placeholder: #46536a;

  --accent: #5eead4;
  --accent-deep: #2dd4bf;
  --accent-ink: #052a26;
  --accent-soft: rgba(94, 234, 212, .09);
  --accent-line: rgba(94, 234, 212, .45);
  --violet: #a78bfa;
  --brand-grad: linear-gradient(92deg, #eafffb, var(--accent) 55%, var(--violet));

  --danger: #fb7185;
  --warn: #fbbf24;
  --good: #4ade80;

  --btn-bg: #131824;
  --btn-text: #c3d0e2;
  --btn-line: #1b2231;
  --btn-hover-line: #33405a;

  --code-bg: #070a0f;
  --code-text: #9fe8db;
  --track: #171d29;
  --shadow: 0 30px 70px -50px #000;

  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

html[data-theme="light"] {
  color-scheme: light;

  --bg: #f4f6f9;
  --glow-a: rgba(13, 148, 136, .09);
  --glow-b: rgba(124, 58, 237, .07);

  --panel-hi: #ffffff;
  --panel-lo: #fbfcfd;
  --panel-2: #f7f9fb;
  --panel-soft: rgba(255, 255, 255, .8);
  --input-bg: #f7f9fb;

  --line: #e2e6ee;
  --line-soft: #edf0f5;

  --text: #111827;
  --muted: #55627a;
  --dim: #7b889e;
  --faint: #9aa6b8;
  --placeholder: #aab4c4;

  --accent: #0f766e;
  --accent-deep: #0d9488;
  --accent-ink: #ffffff;
  --accent-soft: rgba(13, 148, 136, .07);
  --accent-line: rgba(13, 148, 136, .4);
  --violet: #6d28d9;
  --brand-grad: linear-gradient(92deg, #0b1220, #0f766e 58%, #6d28d9);

  --danger: #dc2626;
  --warn: #b45309;
  --good: #15803d;

  --btn-bg: #ffffff;
  --btn-text: #334155;
  --btn-line: #e2e6ee;
  --btn-hover-line: #c8d2e0;

  --code-bg: #f6f8fa;
  --code-text: #0f766e;
  --track: #e8ecf2;
  --shadow: 0 24px 60px -48px rgba(15, 23, 42, .55);
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html, body { min-height: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.6 -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
        "Microsoft YaHei", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background-color .2s ease, color .2s ease;
}

.aurora {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(900px 520px at 18% -8%, var(--glow-a), transparent 64%),
    radial-gradient(760px 460px at 88% 4%, var(--glow-b), transparent 62%);
}

.shell {
  position: relative;
  z-index: 1;
  width: min(1180px, 100% - 48px);
  margin: 0 auto;
  padding: 38px 0 56px;
}

.shell.narrow { width: min(820px, 100% - 48px); }

/* ---------------- 顶部 ---------------- */

.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}

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

.mark {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 14px;
  color: var(--accent-ink);
  background: linear-gradient(145deg, var(--accent), var(--accent-deep));
  box-shadow: 0 12px 30px -14px color-mix(in srgb, var(--accent) 70%, transparent);
}

.brand-text h1 {
  margin: 0;
  font-size: 19px;
  letter-spacing: .22em;
  font-weight: 700;
  background: var(--brand-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.brand-text p { margin: 2px 0 0; color: var(--dim); font-size: 12.5px; letter-spacing: .02em; }

.top-right { display: flex; align-items: center; gap: 10px; }

.live {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  border: 1px solid var(--line);
  border-radius: 99px;
  background: var(--panel-soft);
  color: var(--muted);
  font-size: 12.5px;
}

.dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse 2.4s ease-out infinite;
}

@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent) 50%, transparent); }
  70%  { box-shadow: 0 0 0 7px transparent; }
  100% { box-shadow: 0 0 0 0 transparent; }
}

.icon-btn {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border-radius: 11px;
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--muted);
  font-size: 15px;
  cursor: pointer;
  transition: .16s;
}

.icon-btn:hover { color: var(--accent); border-color: var(--btn-hover-line); }

.nav-link {
  padding: 7px 13px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--muted);
  font-size: 12.5px;
  text-decoration: none;
  transition: .16s;
  white-space: nowrap;
}

.nav-link:hover { color: var(--accent); border-color: var(--btn-hover-line); }

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

.grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
  gap: 20px;
  align-items: start;
}

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

.card {
  position: relative;
  background: linear-gradient(180deg, var(--panel-hi), var(--panel-lo));
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 24px;
  box-shadow: var(--shadow);
  transition: background .2s ease, border-color .2s ease;
}

.card.quiet { background: var(--panel-soft); }

.card-head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.step {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid var(--accent-line);
  border-radius: 6px;
  padding: 2px 7px;
  align-self: center;
}

.card-head h2 { margin: 0; font-size: 15.5px; font-weight: 650; letter-spacing: .02em; }

.hint { color: var(--dim); font-size: 12px; }

/* ---------------- 表单 ---------------- */

.field { display: block; margin-bottom: 18px; }

.label {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 12.5px;
  letter-spacing: .04em;
}

.dim { color: var(--dim); font-style: normal; font-size: 11.5px; }

.input-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 14px;
  background: var(--input-bg);
  border: 1px solid var(--line);
  border-radius: 12px;
  transition: border-color .16s, box-shadow .16s;
}

.input-wrap:focus-within {
  border-color: var(--accent-line);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.prefix { color: var(--accent); font-family: var(--mono); font-size: 13px; }

.input-wrap input,
input[type="datetime-local"],
input.text-box,
textarea {
  width: 100%;
  outline: 0;
  color: var(--text);
  font: inherit;
  font-family: var(--mono);
  font-size: 13px;
  background: transparent;
}

.input-wrap input { border: 0; padding: 12px 0; }

input[type="datetime-local"], input.text-box, textarea {
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 11px 14px;
  transition: border-color .16s, box-shadow .16s;
}

textarea { resize: vertical; min-height: 76px; line-height: 1.55; }

input::placeholder, textarea::placeholder { color: var(--placeholder); }

input[type="datetime-local"]:focus, input.text-box:focus, textarea:focus {
  border-color: var(--accent-line);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

input[type="datetime-local"] { margin-top: 10px; }

.hidden { display: none !important; }

.cred-row { display: flex; gap: 8px; margin-top: 8px; align-items: stretch; }
.cred-row input { flex: 1; min-width: 0; }
.cred-row .btn { white-space: nowrap; }

.field-note { margin: 9px 0 0; font-size: 11.5px; color: var(--dim); line-height: 1.6; }

.linkish {
  border: 0;
  background: none;
  padding: 0 2px;
  color: var(--accent);
  font: inherit;
  font-size: 11.5px;
  cursor: pointer;
  text-decoration: underline dotted;
  text-underline-offset: 3px;
}

.linkish:hover { text-decoration-style: solid; }

.field-note code {
  font-family: var(--mono);
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 5px;
  padding: 1px 5px;
}

/* ---------------- 分段按钮 ---------------- */

.chips { display: flex; flex-wrap: wrap; gap: 8px; }

.chips button {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1px;
  padding: 7px 13px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--muted);
  font: inherit;
  font-size: 12.5px;
  line-height: 1.35;
  cursor: pointer;
  transition: .15s;
}

.chips button em { font-style: normal; font-size: 10.5px; color: var(--dim); letter-spacing: .02em; }

.chips button:hover { border-color: var(--btn-hover-line); color: var(--text); }

.chips button.on {
  border-color: var(--accent-line);
  background: var(--accent-soft);
  color: var(--accent);
}

.chips button.on em { color: color-mix(in srgb, var(--accent) 70%, var(--dim)); }

/* ---------------- 判定条 ---------------- */

.verdict {
  margin: -4px 0 18px;
  padding: 13px 15px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel-soft);
  animation: rise .22s ease;
}

/* 只动 transform、不动 opacity：即使动画被节流/不播放，内容也不会"消失" */
@keyframes rise {
  from { transform: translateY(6px); }
  to   { transform: none; }
}

.v-head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }

.v-tag {
  font-size: 11.5px;
  font-weight: 600;
  padding: 2px 9px;
  border-radius: 6px;
  letter-spacing: .04em;
}

.v-blocked, .v-danger { color: var(--danger); }
.v-risky { color: var(--warn); }
.v-neutral { color: var(--muted); }
.v-trusted { color: var(--good); }

.v-blocked { background: color-mix(in srgb, var(--danger) 10%, transparent); border: 1px solid color-mix(in srgb, var(--danger) 28%, transparent); }
.v-risky   { background: color-mix(in srgb, var(--warn) 10%, transparent);   border: 1px solid color-mix(in srgb, var(--warn) 28%, transparent); }
.v-neutral { background: color-mix(in srgb, var(--muted) 9%, transparent);   border: 1px solid color-mix(in srgb, var(--muted) 22%, transparent); }
.v-trusted { background: color-mix(in srgb, var(--good) 9%, transparent);    border: 1px solid color-mix(in srgb, var(--good) 26%, transparent); }

.v-host { font-family: var(--mono); font-size: 12px; color: var(--muted); }
.v-score { margin-left: auto; font-size: 11.5px; color: var(--dim); }

.v-bar { height: 3px; border-radius: 99px; background: var(--track); margin: 10px 0 0; overflow: hidden; }
.v-bar i { display: block; height: 100%; border-radius: 99px; background: var(--muted); transition: width .3s; }
.v-risky .v-bar i { background: var(--warn); }
.v-blocked .v-bar i { background: var(--danger); }
.v-trusted .v-bar i { background: var(--good); }

.v-list { margin: 10px 0 0; padding: 0; list-style: none; display: grid; gap: 4px; }

.v-list li {
  position: relative;
  padding-left: 14px;
  font-size: 12px;
  color: var(--muted);
  line-height: 1.55;
}

.v-list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 8px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--faint);
}

.v-list li.good::before { background: var(--good); }
.v-list li.warn::before { background: var(--warn); }
.v-list li.danger::before { background: var(--danger); }

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

.actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 6px; }

.btn {
  appearance: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  border: 1px solid var(--btn-line);
  background: var(--btn-bg);
  color: var(--btn-text);
  font: inherit;
  font-size: 13.5px;
  padding: 10px 18px;
  border-radius: 11px;
  cursor: pointer;
  transition: .16s;
}

.btn:hover { border-color: var(--btn-hover-line); color: var(--text); transform: translateY(-1px); }
.btn:active { transform: none; }
.btn:disabled { opacity: .45; cursor: not-allowed; transform: none; }

.btn.primary {
  background: linear-gradient(145deg, var(--accent), var(--accent-deep));
  border-color: transparent;
  color: var(--accent-ink);
  font-weight: 650;
  box-shadow: 0 14px 34px -20px color-mix(in srgb, var(--accent) 80%, transparent);
}

.btn.primary:hover { filter: brightness(1.06); color: var(--accent-ink); }

.btn.ghost {
  border-color: color-mix(in srgb, var(--warn) 35%, transparent);
  background: color-mix(in srgb, var(--warn) 8%, transparent);
  color: var(--warn);
}

.btn.small { padding: 6px 12px; font-size: 12px; border-radius: 9px; }

/* ---------------- 生成结果 ---------------- */

.result {
  margin-top: 22px;
  padding-top: 20px;
  border-top: 1px dashed var(--line);
  animation: rise .26s ease;
}

.r-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.r-title { font-size: 12.5px; color: var(--accent); letter-spacing: .06em; }
.r-len { font-family: var(--mono); font-size: 11.5px; color: var(--dim); }

.r-url {
  display: block;
  padding: 14px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--code-bg);
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.75;
  color: var(--code-text);
  word-break: break-all;
  max-height: 190px;
  overflow: auto;
}

.r-url .tk { color: var(--violet); }

.r-actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 12px; align-items: center; }

.r-meta { margin-top: 12px; font-size: 12px; color: var(--dim); display: flex; gap: 14px; flex-wrap: wrap; }
.r-meta b { color: var(--muted); font-weight: 600; font-family: var(--mono); }

.copy-ok { color: var(--accent) !important; border-color: var(--accent-line) !important; }

/* ---------------- 体检台 ---------------- */

.inspect { margin-top: 16px; animation: rise .24s ease; }

.i-state {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 3px 10px;
  border-radius: 7px;
  font-size: 11.5px;
  font-weight: 600;
  margin-bottom: 12px;
}

.i-ok      { color: var(--good);   background: color-mix(in srgb, var(--good) 9%, transparent);   border: 1px solid color-mix(in srgb, var(--good) 26%, transparent); }
.i-warn    { color: var(--warn);   background: color-mix(in srgb, var(--warn) 9%, transparent);   border: 1px solid color-mix(in srgb, var(--warn) 26%, transparent); }
.i-expired { color: var(--warn);   background: color-mix(in srgb, var(--warn) 9%, transparent);   border: 1px solid color-mix(in srgb, var(--warn) 26%, transparent); }
.i-blocked { color: var(--danger); background: color-mix(in srgb, var(--danger) 9%, transparent); border: 1px solid color-mix(in srgb, var(--danger) 26%, transparent); }
.i-invalid { color: var(--danger); background: color-mix(in srgb, var(--danger) 9%, transparent); border: 1px solid color-mix(in srgb, var(--danger) 26%, transparent); }

.kv { display: grid; gap: 1px; border: 1px solid var(--line); border-radius: 11px; overflow: hidden; background: var(--line-soft); }

.kv-row {
  display: flex;
  gap: 14px;
  padding: 9px 13px;
  background: var(--panel-2);
  font-size: 12.5px;
}

.kv-row .k { flex: 0 0 92px; color: var(--dim); }
.kv-row .v { color: var(--text); word-break: break-all; font-family: var(--mono); font-size: 12px; }

.i-note { margin: 12px 0 0; font-size: 12px; color: var(--dim); line-height: 1.65; }
.i-err { margin: 0; font-size: 12.5px; color: var(--danger); }

/* ---------------- 原理 ---------------- */

.steps { margin: 0; padding: 0; list-style: none; display: grid; gap: 12px; counter-reset: s; }

.steps li { position: relative; padding-left: 26px; counter-increment: s; }

.steps li::before {
  content: counter(s);
  position: absolute;
  left: 0;
  top: 1px;
  width: 17px;
  height: 17px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 10px;
  font-family: var(--mono);
  color: var(--accent);
  border: 1px solid var(--accent-line);
  background: var(--accent-soft);
}

.steps b { display: block; font-size: 12.5px; color: var(--text); font-weight: 600; margin-bottom: 1px; }
.steps span { font-size: 12px; color: var(--dim); line-height: 1.6; }

.foot {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
  font-size: 11.5px;
  line-height: 1.75;
  color: var(--faint);
}

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

.foot-bar {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 26px;
  padding: 0 4px;
  font-size: 11.5px;
  color: var(--faint);
  letter-spacing: .02em;
}

.foot-bar a { color: var(--dim); text-decoration: none; border-bottom: 1px dotted var(--line); }
.foot-bar a:hover { color: var(--accent); }

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

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}

@media (max-width: 940px) {
  .grid { grid-template-columns: minmax(0, 1fr); }
  .shell, .shell.narrow { width: min(720px, 100% - 32px); padding-top: 26px; }
}

@media (max-width: 520px) {
  .card { padding: 18px; border-radius: 15px; }
  .brand-text h1 { font-size: 17px; }
  .live { display: none; }
  .chips button { flex: 1 1 calc(33% - 8px); align-items: center; }
  .r-url { font-size: 11px; }
}