:root {
  --jt-bg: #ffffff;
  --jt-bg-alt: #f3f6fb;
  --jt-bg-page: #eef2f8;
  --jt-text: #0a1633;
  --jt-text-soft: #5c6478;
  --jt-border: #e2e8f0;
  --jt-primary: #00558b;
  --jt-primary-alt: #1c8ad6;
  --jt-primary-soft: rgba(0, 85, 139, 0.1);
  --jt-success: #00b894;
  --jt-success-soft: rgba(0, 184, 148, 0.12);
  --jt-danger: #e74c3c;
  --jt-danger-soft: rgba(231, 76, 60, 0.12);
  --jt-warning: #f39c12;
  --zyt-dark: #0b1a2e;
  --zyt-dark-2: #122640;
  --radius-xl: 24px;
  --radius-lg: 16px;
  --radius-md: 12px;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro SC", "PingFang SC", "Helvetica Neue", "Noto Sans SC", sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Code", monospace;
  --wrap: min(1120px, calc(100% - 48px));
  --wrap-wide: min(1200px, calc(100% - 48px));
}

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

html { scroll-behavior: smooth; }

html, body {
  margin: 0;
  min-height: 100%;
  font-family: var(--font);
  color: var(--jt-text);
  background: var(--jt-bg);
  font-size: 15px;
  line-height: 1.6;
}

button, textarea, input { font: inherit; }

.hidden { display: none !important; }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); border: 0;
}

.site { overflow-x: hidden; }

/* ── Header ── */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(11, 26, 46, 0.82);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.site-header__inner {
  max-width: var(--wrap-wide);
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  gap: 32px;
}

.site-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: #fff;
  flex-shrink: 0;
}

.site-brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.site-brand__text strong {
  font-size: 16px;
  font-weight: 700;
}

.site-brand__text small {
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.45);
}

.site-nav {
  display: flex;
  gap: 28px;
  flex: 1;
}

.site-nav a {
  color: rgba(255, 255, 255, 0.72);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.15s;
}

.site-nav a:hover { color: #fff; }

.site-header__link {
  flex-shrink: 0;
  padding: 8px 18px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #fff;
  text-decoration: none;
  font-size: 13px;
  font-weight: 600;
  transition: background 0.15s, border-color 0.15s;
}

.site-header__link:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.35);
}

/* ── Hero band ── */
.hero-band {
  position: relative;
  padding: 120px 24px 80px;
  background: linear-gradient(160deg, var(--zyt-dark) 0%, var(--zyt-dark-2) 45%, #0d2844 100%);
  color: #fff;
  overflow: hidden;
}

.hero-band__mesh {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 70% 60% at 20% 10%, rgba(28, 138, 214, 0.28), transparent 60%),
    radial-gradient(ellipse 50% 50% at 85% 30%, rgba(0, 168, 204, 0.15), transparent 55%),
    radial-gradient(ellipse 40% 40% at 50% 100%, rgba(0, 85, 139, 0.35), transparent 50%);
  pointer-events: none;
}

.hero-band__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(to bottom, rgba(0,0,0,0.5), transparent 85%);
  pointer-events: none;
}

.hero-band__inner {
  position: relative;
  max-width: var(--wrap-wide);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1.05fr;
  gap: 48px;
  align-items: center;
}

.hero-eyebrow {
  display: inline-block;
  margin: 0 0 16px;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(28, 138, 214, 0.18);
  border: 1px solid rgba(28, 138, 214, 0.35);
  font-size: 12px;
  font-weight: 600;
  color: #7ec8f7;
  letter-spacing: 0.02em;
}

.hero-title {
  margin: 0 0 16px;
  font-size: clamp(32px, 4.5vw, 46px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
}

.hero-desc {
  margin: 0 0 28px;
  font-size: 16px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.72);
  max-width: 440px;
}

.hero-stats {
  display: flex;
  gap: 32px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.hero-stats li {
  display: flex;
  flex-direction: column;
}

.hero-stats strong {
  font-size: 28px;
  font-weight: 800;
  color: #fff;
  line-height: 1.1;
  background: linear-gradient(135deg, #fff, #7ec8f7);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-stats span {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.5);
  margin-top: 4px;
}

/* Tool panel */
.tool-panel {
  background: rgba(255, 255, 255, 0.97);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-xl);
  padding: 24px;
  box-shadow:
    0 24px 64px rgba(0, 0, 0, 0.35),
    0 0 0 1px rgba(255, 255, 255, 0.05) inset;
  color: var(--jt-text);
}

.tool-panel__head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.tool-panel__head h2 {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
}

.char-count { font-size: 12px; color: var(--jt-text-soft); }

.tool-panel__input {
  width: 100%;
  min-height: 140px;
  resize: vertical;
  border: 1px solid var(--jt-border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  font-size: 14px;
  line-height: 1.65;
  background: var(--jt-bg-alt);
  color: var(--jt-text);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.tool-panel__input::placeholder { color: #94a3b8; }

.tool-panel__input:focus {
  outline: none;
  border-color: var(--jt-primary-alt);
  box-shadow: 0 0 0 4px var(--jt-primary-soft);
  background: #fff;
}

.tool-panel__detect { margin: 8px 0 16px; font-size: 13px; }
.detect-hint { color: var(--jt-text-soft); }
.detect-hint--ok { color: var(--jt-success); font-weight: 600; }
.detect-hint--warn { color: var(--jt-warning); }

.tool-panel__actions {
  display: flex;
  gap: 10px;
}

.btn {
  border-radius: 999px;
  border: 1px solid transparent;
  padding: 12px 24px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.1s, box-shadow 0.15s, opacity 0.15s;
}

.btn:active:not(:disabled) { transform: scale(0.98); }

.btn--xl {
  flex: 1;
  padding: 14px 28px;
  font-size: 15px;
}

.btn--primary {
  background: linear-gradient(135deg, var(--jt-primary), var(--jt-primary-alt));
  color: #fff;
  box-shadow: 0 8px 24px rgba(0, 85, 139, 0.35);
}

.btn--primary:hover:not(:disabled) {
  box-shadow: 0 10px 28px rgba(0, 85, 139, 0.45);
}

.btn--primary:disabled { opacity: 0.65; cursor: not-allowed; }

.btn--ghost-light {
  background: transparent;
  border-color: var(--jt-border);
  color: var(--jt-text-soft);
}

.btn--ghost-light:hover {
  border-color: var(--jt-primary-alt);
  color: var(--jt-primary);
}

.btn--ghost {
  background: #fff;
  border-color: var(--jt-border);
  color: var(--jt-text);
}

.btn--sm { padding: 6px 14px; font-size: 12px; }

.link-btn {
  border: none;
  background: none;
  color: var(--jt-primary);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  padding: 0;
}

.link-btn:hover { text-decoration: underline; }

/* ── Workspace ── */
.workspace {
  padding: 56px 24px 64px;
  background: var(--jt-bg-page);
  margin-top: -32px;
  border-radius: 32px 32px 0 0;
  position: relative;
  z-index: 2;
}

.workspace__inner {
  max-width: var(--wrap-wide);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 28px;
  align-items: start;
}

.section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.section-head h2 {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
}

.results-summary { font-size: 13px; color: var(--jt-text-soft); }

.result-placeholder {
  text-align: center;
  padding: 48px 24px;
  background: #fff;
  border: 1px dashed var(--jt-border);
  border-radius: var(--radius-lg);
  color: var(--jt-text-soft);
  font-size: 14px;
}

.result-placeholder p { margin: 16px 0 0; }

.result-placeholder__visual {
  display: flex;
  justify-content: center;
}

.link-flow {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
}

.link-flow__short,
.link-flow__long {
  padding: 8px 14px;
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 13px;
}

.link-flow__short {
  background: var(--jt-primary-soft);
  color: var(--jt-primary);
}

.link-flow__long {
  background: var(--jt-success-soft);
  color: var(--jt-success);
}

.link-flow__arrow {
  font-size: 20px;
  color: var(--jt-text-soft);
}

.results-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.result-card {
  background: #fff;
  border: 1px solid var(--jt-border);
  border-radius: var(--radius-lg);
  padding: 18px 20px;
  box-shadow: 0 4px 16px rgba(0, 85, 139, 0.05);
  animation: rise 0.4s ease both;
}

@keyframes rise {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.result-card--ok { border-left: 4px solid var(--jt-success); }
.result-card--fail { border-left: 4px solid var(--jt-danger); }

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

.badge {
  display: inline-flex;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
}

.badge--ok { background: var(--jt-success-soft); color: var(--jt-success); }
.badge--fail { background: var(--jt-danger-soft); color: var(--jt-danger); }
.badge--platform { background: var(--jt-primary-soft); color: var(--jt-primary); }
.badge--platform-xhs { background: rgba(255,36,66,.1); color: #ff2442; }
.badge--platform-douyin { background: rgba(0,0,0,.06); color: #111; }
.badge--platform-bilibili { background: rgba(251,114,153,.12); color: #fb7299; }
.badge--platform-wechat { background: rgba(250,157,59,.15); color: #c77800; }

.result-card__short {
  font-size: 13px;
  color: var(--jt-text-soft);
  margin-bottom: 14px;
  word-break: break-all;
}

.result-card__short strong { color: var(--jt-text); }

.result-card__url { margin-bottom: 14px; }

.result-card__url-label {
  display: block;
  font-size: 11px;
  font-weight: 700;
  color: var(--jt-text-soft);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 6px;
}

.result-card__url-box {
  display: flex;
  background: var(--jt-bg-alt);
  border: 1px solid var(--jt-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.result-card__url-text {
  flex: 1;
  min-width: 0;
  padding: 12px 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.55;
  word-break: break-all;
}

.result-card__url-copy {
  flex-shrink: 0;
  border: none;
  border-left: 1px solid var(--jt-border);
  background: #fff;
  color: var(--jt-primary);
  font-weight: 700;
  font-size: 13px;
  padding: 0 18px;
  cursor: pointer;
}

.result-card__url-copy:hover { background: var(--jt-primary-soft); }

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

.result-card details {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px dashed var(--jt-border);
  font-size: 13px;
  color: var(--jt-text-soft);
}

.result-card summary {
  cursor: pointer;
  color: var(--jt-primary);
  font-weight: 600;
}

.detail-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 10px;
}

.detail-cell dt { margin: 0; font-size: 11px; color: var(--jt-text-soft); }
.detail-cell dd { margin: 2px 0 0; font-size: 13px; word-break: break-all; }

.chain-text {
  margin-top: 8px;
  padding: 10px;
  background: var(--jt-bg-alt);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.6;
  word-break: break-all;
}

/* History sidebar */
.workspace__side {
  background: #fff;
  border: 1px solid var(--jt-border);
  border-radius: var(--radius-lg);
  padding: 18px;
  position: sticky;
  top: 84px;
  max-height: calc(100vh - 100px);
  overflow-y: auto;
}

.side-note {
  margin: -8px 0 14px;
  font-size: 12px;
  color: var(--jt-text-soft);
}

.history-empty {
  text-align: center;
  padding: 32px 12px;
  font-size: 13px;
  color: var(--jt-text-soft);
  background: var(--jt-bg-alt);
  border-radius: var(--radius-md);
}

.history-list { display: flex; flex-direction: column; gap: 8px; }

.history-item {
  padding: 10px 12px;
  border-radius: var(--radius-md);
  background: var(--jt-bg-alt);
  border: 1px solid transparent;
  transition: border-color 0.15s;
}

.history-item:hover { border-color: var(--jt-border); }

.history-item__top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 4px;
}

.history-item__platform {
  font-size: 12px;
  font-weight: 700;
  color: var(--jt-primary);
}

.history-item__status {
  font-size: 10px;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 999px;
}

.history-item__status--ok { background: var(--jt-success-soft); color: var(--jt-success); }
.history-item__status--fail { background: var(--jt-danger-soft); color: var(--jt-danger); }

.history-item__url {
  font-size: 11px;
  color: var(--jt-text-soft);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  margin-bottom: 6px;
}

.history-item__actions { display: flex; gap: 8px; }

.history-item__actions button {
  border: none;
  background: none;
  color: var(--jt-primary);
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  padding: 0;
}

/* ── Features ── */
.section-wrap {
  max-width: var(--wrap-wide);
  margin: 0 auto;
  padding: 0 24px;
}

.section-wrap--narrow { max-width: 720px; }

.section-intro {
  text-align: center;
  margin-bottom: 48px;
}

.section-intro h2 {
  margin: 0 0 10px;
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.section-intro p {
  margin: 0;
  font-size: 16px;
  color: var(--jt-text-soft);
}

.section-intro--light h2,
.section-intro--light p { color: #fff; }
.section-intro--light p { opacity: 0.75; }

.features {
  padding: 80px 0;
  background: #fff;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.feature-card {
  padding: 28px 24px;
  border-radius: var(--radius-lg);
  background: var(--jt-bg-alt);
  border: 1px solid var(--jt-border);
  transition: transform 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(0, 85, 139, 0.08);
}

.feature-card__icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--jt-primary), var(--jt-primary-alt));
  color: #fff;
  display: grid;
  place-items: center;
  margin-bottom: 16px;
}

.feature-card__icon svg { width: 22px; height: 22px; }

.feature-card h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
}

.feature-card p {
  margin: 0;
  font-size: 14px;
  color: var(--jt-text-soft);
  line-height: 1.65;
}

/* ── Platforms ── */
.platforms {
  padding: 80px 0;
  background: linear-gradient(160deg, var(--zyt-dark) 0%, #0d2844 100%);
}

.platform-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.platform-card {
  padding: 20px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: background 0.15s, transform 0.15s;
}

.platform-card:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-2px);
}

.platform-card span {
  display: block;
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 6px;
}

.platform-card code {
  font-family: var(--font-mono);
  font-size: 11px;
  color: rgba(255, 255, 255, 0.5);
}

.platform-card--xhs { border-left: 3px solid #ff2442; }
.platform-card--douyin { border-left: 3px solid #fff; }
.platform-card--bili { border-left: 3px solid #fb7299; }
.platform-card--wechat { border-left: 3px solid #fa9d3b; }
.platform-card--ks { border-left: 3px solid #ff5000; }
.platform-card--yt { border-left: 3px solid #ff0000; }
.platform-card--xm { border-left: 3px solid #f86442; }
.platform-card--generic { border-left: 3px solid var(--jt-primary-alt); }

/* ── Steps ── */
.steps {
  padding: 72px 0;
  background: var(--jt-bg-page);
}

.steps-row {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 0;
}

.step {
  flex: 1;
  max-width: 260px;
  text-align: center;
  padding: 0 16px;
}

.step__num {
  display: inline-block;
  font-size: 36px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--jt-primary), var(--jt-primary-alt));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 12px;
}

.step h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
}

.step p {
  margin: 0;
  font-size: 14px;
  color: var(--jt-text-soft);
}

.step__line {
  width: 60px;
  height: 2px;
  background: linear-gradient(90deg, var(--jt-primary), var(--jt-primary-alt));
  margin-top: 28px;
  flex-shrink: 0;
  opacity: 0.35;
}

/* ── FAQ ── */
.faq {
  padding: 72px 0 80px;
  background: #fff;
}

.faq h2 {
  text-align: center;
  margin: 0 0 36px;
  font-size: 28px;
  font-weight: 800;
}

.faq-list { margin: 0; }

.faq-item {
  padding: 20px 0;
  border-bottom: 1px solid var(--jt-border);
}

.faq-item:first-child { padding-top: 0; }

.faq-item dt {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
}

.faq-item dd {
  margin: 0;
  font-size: 14px;
  color: var(--jt-text-soft);
  line-height: 1.65;
}

/* ── Footer ── */
.site-footer {
  padding: 48px 24px;
  background: var(--zyt-dark);
  color: rgba(255, 255, 255, 0.65);
}

.site-footer__inner {
  max-width: var(--wrap-wide);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 32px;
  align-items: start;
}

.site-footer__brand strong {
  display: block;
  font-size: 18px;
  color: #fff;
  margin-bottom: 8px;
}

.site-footer__brand p {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
}

.site-footer__brand a {
  color: #7ec8f7;
  text-decoration: none;
}

.site-footer__links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.site-footer__links a {
  color: rgba(255, 255, 255, 0.65);
  text-decoration: none;
  font-size: 14px;
}

.site-footer__links a:hover { color: #fff; }

.site-footer__copy {
  text-align: right;
  font-size: 13px;
  align-self: end;
}

/* ── Toast ── */
.toast {
  position: fixed;
  left: 50%;
  bottom: 28px;
  transform: translateX(-50%);
  background: var(--zyt-dark);
  color: #fff;
  padding: 12px 22px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 500;
  z-index: 200;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.25);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

/* ── Responsive ── */
@media (max-width: 1024px) {
  .hero-band__inner { grid-template-columns: 1fr; gap: 36px; }
  .hero-desc { max-width: none; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .platform-grid { grid-template-columns: repeat(2, 1fr); }
  .workspace__inner { grid-template-columns: 1fr; }
  .workspace__side { position: static; max-height: none; }
}

@media (max-width: 768px) {
  .site-nav { display: none; }
  .hero-band { padding: 100px 16px 64px; }
  .hero-stats { gap: 20px; }
  .hero-stats strong { font-size: 22px; }
  .steps-row { flex-direction: column; align-items: center; gap: 24px; }
  .step__line { width: 2px; height: 32px; margin: 0; }
  .site-footer__inner { grid-template-columns: 1fr; }
  .site-footer__copy { text-align: left; }
  .detail-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 520px) {
  .feature-grid { grid-template-columns: 1fr; }
  .platform-grid { grid-template-columns: 1fr; }
  .tool-panel__actions { flex-direction: column; }
  .detail-grid { grid-template-columns: 1fr; }
}