:root {
  --preview-ink: #172033;
  --preview-muted: #68758a;
  --preview-line: #d8e4f4;
  --preview-blue: #3478f6;
  --preview-blue-soft: #edf5ff;
  --preview-pink: #ee5c88;
  --preview-panel: #fff;
}

* { box-sizing: border-box; }

html { min-height: 100%; }

body {
  min-height: 100vh;
  margin: 0;
  color: var(--preview-ink);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", Arial, sans-serif;
  background:
    radial-gradient(circle at 50% -10%, rgba(99, 157, 255, .23), transparent 32rem),
    linear-gradient(180deg, #edf5ff 0%, #f8fbff 42%, #fff 100%);
}

button, a { font: inherit; }
button { border: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }

.preview-header {
  display: flex;
  align-items: center;
  gap: 30px;
  width: min(1180px, calc(100% - 48px));
  min-height: 76px;
  margin: 0 auto;
}

.preview-brand {
  color: #16284a;
  font-size: 22px;
  font-weight: 900;
  letter-spacing: .02em;
  white-space: nowrap;
}

.preview-brand span { color: #8aa2c7; font-size: 11px; vertical-align: top; }

.preview-header nav {
  display: flex;
  align-items: center;
  gap: 26px;
  margin-left: auto;
  color: #586984;
  font-size: 14px;
}

.preview-header nav a { padding: 8px 0; border-bottom: 2px solid transparent; }
.preview-header nav a:hover, .preview-header nav a.active { color: var(--preview-blue); border-bottom-color: #8db8f4; }

.preview-login {
  padding: 10px 18px;
  border-radius: 999px;
  color: #fff;
  font-size: 14px;
  font-weight: 800;
  background: linear-gradient(135deg, #5ba1ff, #1d5ed8);
  box-shadow: 0 8px 16px rgba(52, 120, 246, .18);
}

.preview-page { width: min(1080px, calc(100% - 40px)); margin: 0 auto; padding: 28px 0 70px; }

.preview-hero { padding: 58px 24px 52px; text-align: center; }
.eyebrow, .section-kicker { color: var(--preview-pink); font-size: 13px; font-weight: 900; letter-spacing: .14em; text-transform: uppercase; }
.preview-hero h1 { margin: 10px 0 12px; color: #182744; font-size: clamp(38px, 6vw, 62px); letter-spacing: .04em; }
.preview-hero p:not(.eyebrow) { max-width: 600px; margin: 0 auto; color: var(--preview-muted); font-size: 16px; line-height: 1.8; }
.hero-cta { display: inline-flex; align-items: center; justify-content: center; min-width: 170px; margin-top: 26px; padding: 13px 24px; border-radius: 999px; color: #fff; font-weight: 800; background: linear-gradient(135deg, #ee8196, #ffb77f); box-shadow: 0 12px 23px rgba(239, 129, 150, .22); }

.sample-section, .material-section {
  margin-top: 16px;
  padding: 30px;
  border: 1px solid #e0eafa;
  border-radius: 18px;
  background: rgba(255, 255, 255, .9);
  box-shadow: 0 12px 38px rgba(50, 99, 166, .08);
}

.section-heading { display: flex; align-items: flex-end; justify-content: space-between; gap: 20px; }
.section-heading h2 { margin: 8px 0 0; font-size: 27px; }
.sample-count, .section-note { color: #8390a4; font-size: 13px; }

.category-tabs { display: flex; flex-wrap: wrap; gap: 9px; margin: 24px 0 20px; }
.category-tabs button { padding: 8px 17px; border: 1px solid var(--preview-line); border-radius: 999px; color: #64728a; background: #fff; }
.category-tabs button:hover, .category-tabs button.active { border-color: #72a9f3; color: #2367c9; background: var(--preview-blue-soft); }

.sample-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.sample-card { display: grid; grid-template-columns: 38px minmax(0, 1fr) auto; align-items: center; gap: 13px; width: 100%; padding: 18px; border: 1px solid #dfe8f6; border-radius: 12px; color: var(--preview-ink); text-align: left; background: #fff; transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease; }
.sample-card:hover { border-color: #9bc0f4; box-shadow: 0 10px 24px rgba(52, 120, 246, .13); transform: translateY(-2px); }
.sample-card-icon { display: grid; place-items: center; width: 38px; height: 38px; border-radius: 11px; color: #fff; font-size: 18px; font-weight: 900; background: linear-gradient(135deg, #5ca8ff, #3978dc); }
.sample-card:nth-child(2) .sample-card-icon { background: linear-gradient(135deg, #9c89f8, #6e57db); }
.sample-card:nth-child(3) .sample-card-icon { background: linear-gradient(135deg, #f7a46f, #ed6f68); }
.sample-card:nth-child(4) .sample-card-icon { background: linear-gradient(135deg, #5dcebf, #2fa6ac); }
.sample-card strong { display: block; font-size: 16px; line-height: 1.55; }
.sample-card small { display: block; margin-top: 5px; color: #8b98aa; font-size: 12px; }
.sample-card-arrow { color: #8eaae0; font-size: 24px; }

.material-section { margin-top: 26px; }
.material-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; margin-top: 22px; }
.material-card { display: grid; grid-template-columns: 36px minmax(0, 1fr) auto; align-items: center; gap: 9px; min-height: 90px; padding: 14px; border: 1px solid #e0e8f4; border-radius: 12px; color: var(--preview-ink); text-align: left; background: #fff; }
.material-card:hover, .material-card.active { border-color: #8eb9f1; background: #f7fbff; }
.material-icon { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 9px; color: #fff; font-weight: 900; background: #5d9df0; }
.material-icon.purple { background: #8d78ec; }.material-icon.orange { background: #ec9869; }.material-icon.green { background: #57b7a2; }
.material-card strong, .material-card small { display: block; }.material-card small { margin-top: 5px; color: #8895a7; font-size: 11px; line-height: 1.35; }.material-arrow { color: #9cb8df; }

.preview-note { margin: 28px 0 0; padding: 18px 22px; border-left: 4px solid #f3a4ba; border-radius: 0 10px 10px 0; color: #66748a; background: rgba(255, 245, 248, .8); }.preview-note strong { color: #d6537e; }.preview-note p { margin: 7px 0 0; font-size: 13px; line-height: 1.7; }
.preview-footer { display: flex; justify-content: space-between; width: min(1080px, calc(100% - 40px)); margin: 0 auto; padding: 24px 0 36px; color: #8a96a8; font-size: 12px; }.preview-footer a { color: #4e88d8; }

.sample-modal[hidden] { display: none; }.sample-modal { position: fixed; inset: 0; z-index: 60; display: grid; place-items: center; padding: 20px; }.sample-modal-backdrop { position: absolute; inset: 0; background: rgba(25, 38, 63, .54); backdrop-filter: blur(2px); }.sample-modal-panel { position: relative; width: min(700px, 100%); max-height: min(760px, calc(100vh - 40px)); padding: 32px 36px; overflow: auto; border-radius: 16px; background: #fff; box-shadow: 0 25px 80px rgba(17, 39, 75, .28); }.sample-modal-close { position: absolute; top: 14px; right: 18px; color: #77859a; font-size: 28px; background: transparent; }.modal-category { color: var(--preview-pink); font-size: 13px; font-weight: 900; }.sample-modal-panel h2 { margin: 10px 40px 18px 0; font-size: 25px; line-height: 1.45; }.sample-modal-tabs { display: flex; gap: 18px; border-bottom: 1px solid #e5ebf4; }.sample-modal-tabs button { padding: 9px 2px; border-bottom: 2px solid transparent; color: #7a8799; background: transparent; }.sample-modal-tabs button.active { border-bottom-color: var(--preview-blue); color: #2469cc; }.sample-modal-content { min-height: 190px; padding: 22px 2px 8px; color: #526176; font-size: 15px; line-height: 1.9; }.sample-modal-content h3 { margin: 0 0 9px; color: #263b61; font-size: 17px; }.sample-modal-content ul { margin: 0; padding-left: 22px; }.sample-modal-content p { margin: 0 0 12px; }.sample-modal-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 18px; }.use-sample-button, .close-sample-button { display: inline-flex; align-items: center; justify-content: center; min-height: 40px; padding: 0 18px; border-radius: 999px; font-size: 14px; font-weight: 800; }.use-sample-button { color: #fff; background: linear-gradient(135deg, #5ba1ff, #1d5ed8); }.close-sample-button { color: #547092; border: 1px solid #c8d9ee; background: #f7fbff; }

@media (max-width: 760px) {
  .preview-header { width: min(100% - 26px, 620px); gap: 12px; }.preview-brand { font-size: 16px; }.preview-header nav { display: none; }.preview-login { margin-left: auto; padding: 9px 12px; font-size: 12px; }
  .preview-page { width: min(100% - 26px, 620px); padding-top: 10px; }.preview-hero { padding: 42px 10px 34px; }.preview-hero h1 { font-size: 42px; }.preview-hero p:not(.eyebrow) { font-size: 14px; }
  .sample-section, .material-section { padding: 21px 16px; }.section-heading { align-items: flex-start; flex-direction: column; gap: 8px; }.section-heading h2 { font-size: 23px; }.category-tabs { gap: 7px; }.category-tabs button { padding: 7px 12px; font-size: 13px; }.sample-grid, .material-grid { grid-template-columns: 1fr; }.sample-card strong { font-size: 15px; }.preview-footer { width: min(100% - 26px, 620px); }
  .sample-modal-panel { padding: 28px 20px 22px; }.sample-modal-actions { align-items: stretch; flex-direction: column; }.use-sample-button, .close-sample-button { width: 100%; }
}