:root {
  --bg: #fbfcff;
  --card: #ffffff;
  --text: #101828;
  --muted: #667085;
  --border: #e4e8f0;
  --primary: #6c3df1;
  --primary-dark: #4f2bc1;
  --yellow: #ffca3a;
  --yellow-soft: #fff4c7;
  --purple-soft: #f0e9ff;
  --green-soft: #e7f8ee;
  --green: #1ba866;
  --pink: #ff4778;
  --shadow: 0 10px 30px rgba(31, 42, 68, .06);
  --radius: 16px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Noto Sans TC", system-ui, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 80% 0%, rgba(108,61,241,.035), transparent 26%),
    var(--bg);
}

button, input, select, textarea { font: inherit; }

button { cursor: pointer; }

.container {
  width: min(1200px, calc(100% - 32px));
  margin: 0 auto;
  padding: 0 16px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255,255,255,.94);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
}

.nav-wrap {
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  text-decoration: none;
}

.brand-avatar {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--yellow-soft);
  font-size: 24px;
}

.brand strong { display: block; font-size: 22px; }
.brand span { display: block; font-size: 11px; color: var(--muted); margin-top: -2px; }

.desktop-nav {
  display: flex;
  align-items: center;
  gap: 26px;
}

.desktop-nav a {
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  font-size: 14px;
}

.desktop-nav .active {
  padding: 12px 18px;
  background: linear-gradient(135deg, #ffe688, var(--yellow));
  border-radius: 12px;
}

.nav-actions { display: flex; gap: 10px; align-items: center; }

.icon-btn, .login-btn, .outline-btn, .primary-btn {
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  border-radius: 11px;
  padding: 10px 14px;
  font-weight: 700;
}

.login-btn {
  background: linear-gradient(135deg, #ffc928, #ffb610);
  border-color: transparent;
}

.page { padding: 28px 0 40px; }

.breadcrumb {
  display: flex;
  gap: 9px;
  color: #7a8495;
  font-size: 14px;
  margin-bottom: 24px;
}

.breadcrumb a { color: #3478f6; text-decoration: none; font-weight: 700; }

.hero {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: end;
  margin-bottom: 22px;
}

.eyebrow {
  display: inline-block;
  background: var(--purple-soft);
  color: var(--primary);
  border-radius: 999px;
  padding: 6px 12px;
  font-weight: 800;
  font-size: 13px;
}

h1 {
  margin: 8px 0 6px;
  font-size: clamp(32px, 4vw, 46px);
  letter-spacing: -.03em;
}

.hero p {
  margin: 0;
  color: var(--muted);
  max-width: 780px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.outline-btn.small { padding: 8px 12px; font-size: 13px; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.parser-card { padding: 18px; margin-bottom: 18px; }

.card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 12px;
}

h2 {
  margin: 0;
  font-size: 18px;
}

.card-head p {
  margin: 5px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.head-actions { display: flex; gap: 8px; }

textarea {
  width: 100%;
  min-height: 155px;
  resize: vertical;
  border: 1px solid #dce2ec;
  border-radius: 12px;
  padding: 14px 16px;
  outline: none;
  line-height: 1.6;
  color: var(--text);
  font-family: "JetBrains Mono", monospace;
  transition: .2s ease;
}

textarea:focus, input:focus, select:focus {
  border-color: #9e82ff;
  box-shadow: 0 0 0 4px rgba(108,61,241,.08);
}

.counter { text-align: right; color: var(--muted); font-size: 12px; margin-top: 6px; }

.conversion-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.timestamp-card, .datetime-card, .calculator-card, .code-card {
  padding: 20px;
}

.section-title {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}

.timestamp-card .section-title h2 { color: #5940d4; }
.datetime-card .section-title h2 { color: var(--pink); }

.status-badge, .detected-chip {
  display: inline-flex;
  align-items: center;
  background: var(--green-soft);
  color: var(--green);
  border-radius: 999px;
  padding: 5px 10px;
  font-size: 12px;
  font-weight: 800;
}

.timestamp-primary {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 18px;
}

.timestamp-number {
  font-family: "JetBrains Mono", monospace;
  font-size: clamp(30px, 4vw, 42px);
  font-weight: 700;
  color: #6243d4;
  word-break: break-all;
  margin-bottom: 8px;
}

.stack-actions { display: flex; flex-direction: column; gap: 8px; }

.result-table {
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}

.result-table > div {
  display: grid;
  grid-template-columns: 110px 1fr 34px;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  min-height: 44px;
}

.result-table > div:last-child { border-bottom: 0; }

.result-table span { color: var(--muted); font-size: 13px; }
.result-table strong { font-family: "JetBrains Mono", monospace; font-size: 13px; overflow-wrap: anywhere; }

.mini-copy {
  border: 0;
  background: transparent;
  color: #7b8798;
  font-size: 16px;
}

.date-input-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 12px;
}

input, select {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 11px;
  min-height: 44px;
  padding: 9px 12px;
  outline: none;
  background: #fff;
}

.timezone-row {
  display: grid;
  grid-template-columns: 55px 1fr;
  gap: 10px;
  align-items: center;
  margin-bottom: 14px;
  color: var(--muted);
  font-size: 13px;
}

.quick-card { padding: 18px; margin-top: 18px; }

.preset-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
  gap: 12px;
}

.preset-grid button {
  min-height: 84px;
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 13px;
  padding: 12px;
  text-align: left;
  transition: .2s ease;
}

.preset-grid button:hover {
  transform: translateY(-2px);
  border-color: #bba8ff;
  box-shadow: 0 10px 24px rgba(84,56,180,.09);
}

.preset-grid span { font-size: 18px; display: block; }
.preset-grid b { display: block; margin: 5px 0 2px; font-size: 13px; }
.preset-grid small { color: var(--muted); }

.lower-grid {
  display: grid;
  grid-template-columns: .9fr 1.1fr;
  gap: 18px;
  margin-top: 18px;
}

.tabs, .code-tabs {
  display: flex;
  gap: 18px;
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
}

.tab, .code-tabs button {
  border: 0;
  background: transparent;
  padding: 10px 2px;
  font-weight: 700;
  color: var(--muted);
  white-space: nowrap;
}

.tab.active, .code-tabs button.active {
  color: var(--primary);
  border-bottom: 2px solid var(--primary);
}

.tab-panel { display: none; padding-top: 16px; }
.tab-panel.active { display: block; }

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.form-grid.two { grid-template-columns: 1fr 1fr; }

.form-grid label {
  font-size: 12px;
  color: var(--muted);
}

.form-grid input, .form-grid select { margin-top: 6px; }

.primary-btn {
  margin-top: 14px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  border: 0;
}

.calc-output {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 10px;
  margin-top: 14px;
  background: #f8f9fc;
  border-radius: 12px;
  padding: 12px;
}

.calc-output span { color: var(--muted); }
.calc-output strong { font-family: "JetBrains Mono", monospace; overflow-wrap: anywhere; }

.code-wrap {
  position: relative;
  margin-top: 12px;
  background: #111827;
  border-radius: 12px;
  overflow: hidden;
}

.code-wrap pre {
  margin: 0;
  min-height: 240px;
  padding: 22px;
  overflow: auto;
  color: #d1fae5;
  font-family: "JetBrains Mono", monospace;
  line-height: 1.7;
  font-size: 13px;
}

.copy-code {
  position: absolute;
  right: 12px;
  top: 12px;
  border: 1px solid #344054;
  background: #182230;
  color: #fff;
  border-radius: 9px;
  padding: 8px 10px;
  z-index: 2;
}

.notice {
  margin-top: 18px;
  padding: 12px 16px;
  border-radius: 10px;
  background: #f2ecff;
  color: #5d47a7;
  font-size: 13px;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 30px;
  transform: translate(-50%, 20px);
  background: #101828;
  color: #fff;
  padding: 10px 16px;
  border-radius: 10px;
  opacity: 0;
  pointer-events: none;
  transition: .25s;
  z-index: 50;
}

.toast.show { opacity: 1; transform: translate(-50%, 0); }

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

@media (max-width: 1000px) {
  .desktop-nav { display: none; }
  .hero { align-items: flex-start; flex-direction: column; }
  .hero-actions { justify-content: flex-start; }
  .conversion-grid { grid-template-columns: 1fr; }
  .lower-grid { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  .container { width: min(100% - 24px, 1180px); }
  .nav-wrap { height: 64px; }
  .brand span, .icon-btn { display: none; }
  .conversion-grid, .lower-grid { grid-template-columns: 1fr; }
  .card-head { align-items: flex-start; flex-direction: column; }
  .timestamp-primary { flex-direction: column; }
  .stack-actions { flex-direction: row; flex-wrap: wrap; }
  .preset-grid { grid-template-columns: repeat(2, 1fr); }
  .form-grid { grid-template-columns: 1fr 1fr; }
  .date-input-row { grid-template-columns: 1fr; }
  .hero-actions { display: none; }
  h1 { font-size: 34px; }
}

@media (max-width: 460px) {
  .form-grid, .form-grid.two { grid-template-columns: 1fr; }
  .result-table > div { grid-template-columns: 90px 1fr 28px; }
  .login-btn { padding: 9px 11px; }
}