:root {
  color-scheme: light;
  --paper: #f4f1e7;
  --paper-strong: #fffdf7;
  --ink: #143c36;
  --ink-soft: #526b66;
  --line: #d9ded7;
  --line-strong: #bdc9c3;
  --accent: #d7ff55;
  --accent-ink: #173a32;
  --accent-soft: #eaff9e;
  --danger: #9d3a32;
  --danger-soft: #fff0ed;
  --focus: #147d6e;
  --shadow: 0 18px 52px rgba(26, 57, 50, .10);
  --shadow-soft: 0 8px 24px rgba(26, 57, 50, .07);
  --radius-xl: 30px;
  --radius-lg: 22px;
  --radius-md: 15px;
  --radius-sm: 10px;
  --max: 1180px;
  --font: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
}

[data-theme="dark"] {
  color-scheme: dark;
  --paper: #0d211e;
  --paper-strong: #132b27;
  --ink: #eff8f3;
  --ink-soft: #a8bbb5;
  --line: #29443e;
  --line-strong: #3b5b54;
  --accent: #d7ff55;
  --accent-ink: #173a32;
  --accent-soft: #3b5224;
  --danger: #ffaca4;
  --danger-soft: #492724;
  --focus: #90ead9;
  --shadow: 0 18px 52px rgba(0, 0, 0, .28);
  --shadow-soft: 0 8px 24px rgba(0, 0, 0, .20);
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  background: var(--paper);
}

body {
  margin: 0;
  min-width: 300px;
  background:
    radial-gradient(circle at 8% 4%, color-mix(in srgb, var(--accent) 22%, transparent), transparent 24rem),
    var(--paper);
  color: var(--ink);
  font-family: var(--font);
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

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

button,
a { -webkit-tap-highlight-color: transparent; }

button { color: inherit; }

a {
  color: inherit;
  text-underline-offset: .2em;
  text-decoration-thickness: .08em;
}

img, svg { display: block; max-width: 100%; }

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 12px;
  left: 12px;
  padding: 10px 14px;
  border-radius: 10px;
  background: var(--ink);
  color: var(--paper-strong);
  transform: translateY(-160%);
}

.skip-link:focus { transform: translateY(0); }

.site-header {
  position: relative;
  z-index: 20;
  border-bottom: 1px solid color-mix(in srgb, var(--line) 72%, transparent);
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(18px);
}

.site-header__inner {
  width: min(calc(100% - 36px), var(--max));
  min-height: 72px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  text-decoration: none;
  font-weight: 800;
  letter-spacing: -.02em;
}

.brand__mark {
  width: 36px;
  height: 36px;
  border-radius: 11px;
  display: grid;
  place-items: center;
  background: var(--ink);
  color: var(--accent);
  font-size: 17px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.site-nav a {
  padding: 9px 12px;
  border-radius: 999px;
  color: var(--ink-soft);
  font-size: 14px;
  font-weight: 650;
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  background: var(--paper-strong);
  color: var(--ink);
}

.language-switch {
  border: 1px solid var(--line);
  background: var(--paper-strong);
  color: var(--ink) !important;
  white-space: nowrap;
}

.theme-toggle {
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--paper-strong);
  cursor: pointer;
}

.page-shell {
  width: min(calc(100% - 36px), var(--max));
  margin: 0 auto;
}

.hero {
  max-width: 980px;
  margin: 0 auto;
  padding: 72px 0 38px;
  text-align: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin: 0 0 14px;
  padding: 7px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: color-mix(in srgb, var(--paper-strong) 74%, transparent);
  color: var(--ink-soft);
  font-size: 13px;
  font-weight: 750;
  letter-spacing: .04em;
}

.eyebrow::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 25%, transparent);
}

.hero h1 {
  max-width: 960px;
  margin: 0 auto 18px;
  font-size: clamp(38px, 6vw, 68px);
  line-height: 1.05;
  letter-spacing: -.055em;
}

.hero p {
  max-width: 700px;
  margin: 0 auto;
  color: var(--ink-soft);
  font-size: clamp(16px, 2vw, 20px);
}

.hero__example {
  margin-top: 20px !important;
  color: var(--ink) !important;
  font-size: 14px !important;
  font-weight: 700;
}

.tool-frame { margin: 0 auto 80px; }

.time-chain-app {
  max-width: 1040px;
  margin: 0 auto;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: color-mix(in srgb, var(--paper-strong) 94%, transparent);
  box-shadow: var(--shadow);
  overflow: clip;
}

.app-toolbar {
  min-height: 64px;
  padding: 12px 18px;
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.app-title {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 14px;
  font-weight: 800;
}

.local-badge {
  padding: 4px 8px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--ink);
  font-size: 11px;
  font-weight: 800;
}

.toolbar-actions,
.result-actions,
.step-actions,
.move-actions,
.quick-duration,
.shift-actions,
.template-grid {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.icon-button,
.text-button,
.chip,
.secondary-button,
.primary-button,
.danger-button {
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--paper-strong);
  color: var(--ink);
  cursor: pointer;
  font-weight: 750;
  transition: transform .16s ease, border-color .16s ease, background .16s ease;
}

.icon-button:hover,
.text-button:hover,
.chip:hover,
.secondary-button:hover,
.primary-button:hover,
.danger-button:hover { transform: translateY(-1px); }

.icon-button {
  min-width: 44px;
  padding: 0;
  display: inline-grid;
  place-items: center;
}

.text-button,
.secondary-button,
.primary-button,
.danger-button { padding: 10px 15px; }

.primary-button {
  border-color: var(--ink);
  background: var(--ink);
  color: var(--paper-strong);
}

.primary-button--accent {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--accent-ink);
}

.danger-button {
  border-color: color-mix(in srgb, var(--danger) 30%, var(--line));
  color: var(--danger);
}

.text-button {
  border-color: transparent;
  background: transparent;
  color: var(--ink-soft);
}

.button-small {
  min-height: 38px;
  padding: 7px 11px;
  border-radius: 10px;
  font-size: 13px;
}

button:disabled {
  opacity: .38;
  cursor: not-allowed;
  transform: none !important;
}

.mode-switch {
  width: min(calc(100% - 36px), 520px);
  margin: 24px auto 0;
  padding: 5px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--paper);
}

.mode-button {
  min-height: 48px;
  padding: 9px 14px;
  border: 0;
  border-radius: 11px;
  background: transparent;
  color: var(--ink-soft);
  cursor: pointer;
  font-weight: 800;
}

.mode-button[aria-selected="true"] {
  background: var(--paper-strong);
  color: var(--ink);
  box-shadow: var(--shadow-soft);
}

.result-hero {
  margin: 18px;
  padding: clamp(26px, 5vw, 48px);
  border-radius: 24px;
  background: var(--ink);
  color: var(--paper-strong);
  position: relative;
  overflow: hidden;
  isolation: isolate;
}

.result-hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  width: 240px;
  height: 240px;
  right: -80px;
  top: -100px;
  border-radius: 50%;
  background: var(--accent);
  opacity: .16;
}

.result-kicker {
  margin: 0;
  color: color-mix(in srgb, var(--paper-strong) 68%, transparent);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.result-time {
  margin: 3px 0 4px;
  font-size: clamp(58px, 11vw, 104px);
  line-height: 1;
  letter-spacing: -.075em;
  font-variant-numeric: tabular-nums;
  font-weight: 850;
}

.result-day {
  margin: 0;
  color: var(--accent);
  font-size: 16px;
  font-weight: 800;
}

.result-meta {
  margin: 18px 0 0;
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  color: color-mix(in srgb, var(--paper-strong) 77%, transparent);
  font-size: 14px;
}

.result-meta strong { color: var(--paper-strong); }

.result-range {
  margin: 18px 0 0;
  padding: 12px 14px;
  border: 1px solid color-mix(in srgb, var(--paper-strong) 18%, transparent);
  border-radius: 12px;
  background: color-mix(in srgb, var(--paper-strong) 7%, transparent);
  color: color-mix(in srgb, var(--paper-strong) 85%, transparent);
  font-size: 13px;
}

.result-actions { margin-top: 24px; }

.result-actions .text-button,
.result-actions .secondary-button {
  border-color: color-mix(in srgb, var(--paper-strong) 24%, transparent);
  background: color-mix(in srgb, var(--paper-strong) 8%, transparent);
  color: var(--paper-strong);
}

.editor-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(250px, 320px);
  gap: 0;
  border-top: 1px solid var(--line);
}

.editor-main { padding: clamp(18px, 4vw, 30px); }

.editor-side {
  padding: 26px 22px;
  border-left: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper) 58%, var(--paper-strong));
}

.section-heading {
  margin: 0 0 13px;
  font-size: 15px;
  letter-spacing: -.01em;
}

.section-description {
  margin: -6px 0 14px;
  color: var(--ink-soft);
  font-size: 13px;
}

.anchor-card {
  margin-bottom: 26px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--paper-strong);
}

.anchor-row {
  display: grid;
  grid-template-columns: minmax(110px, .8fr) minmax(150px, 1.2fr);
  align-items: end;
  gap: 12px;
}

.field { display: grid; gap: 6px; min-width: 0; }

.field-label {
  color: var(--ink-soft);
  font-size: 12px;
  font-weight: 750;
}

.input,
.textarea,
.select {
  width: 100%;
  min-height: 46px;
  padding: 10px 12px;
  border: 1px solid var(--line-strong);
  border-radius: 11px;
  background: var(--paper-strong);
  color: var(--ink);
}

.input[type="number"] { font-variant-numeric: tabular-nums; }

.textarea {
  min-height: 96px;
  resize: vertical;
}

.input:focus,
.textarea:focus,
.select:focus { border-color: var(--focus); }

.shift-actions { margin-top: 12px; }

.quick-duration { margin: 0 0 18px; }

.chip {
  min-height: 40px;
  padding: 7px 12px;
  border-radius: 999px;
  font-size: 13px;
}

.chip--strong {
  border-color: color-mix(in srgb, var(--accent) 75%, var(--line));
  background: var(--accent-soft);
}

.timeline {
  margin: 0;
  padding: 0;
  list-style: none;
}

.step-row {
  position: relative;
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 12px;
  padding: 0 0 16px;
}

.step-row:not(:last-child)::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 31px;
  bottom: -2px;
  width: 2px;
  background: var(--line);
}

.step-index {
  position: relative;
  z-index: 1;
  width: 32px;
  height: 32px;
  border: 2px solid var(--paper-strong);
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--ink);
  color: var(--paper-strong);
  font-size: 12px;
  font-weight: 850;
  box-shadow: 0 0 0 1px var(--line);
}

.step-card {
  min-width: 0;
  padding: 15px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--paper-strong);
  transition: border-color .16s ease, transform .16s ease;
}

.step-row[draggable="true"] .step-card { cursor: grab; }
.step-row.is-dragging { opacity: .45; }
.step-row.is-drag-over .step-card { border-color: var(--focus); transform: translateY(2px); }

.step-main-fields {
  display: grid;
  grid-template-columns: minmax(120px, 1fr) 124px;
  gap: 10px;
}

.duration-wrap {
  position: relative;
}

.duration-wrap .input { padding-right: 42px; }

.duration-unit {
  position: absolute;
  right: 12px;
  bottom: 12px;
  color: var(--ink-soft);
  font-size: 12px;
  pointer-events: none;
}

.step-time {
  margin: 11px 0 0;
  color: var(--ink-soft);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}

.step-time strong { color: var(--ink); }

.step-actions {
  justify-content: space-between;
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--line);
}

.move-actions { gap: 4px; }

.advanced-panel {
  margin-top: 12px;
  padding-top: 11px;
  border-top: 1px dashed var(--line);
}

.advanced-panel summary {
  color: var(--ink-soft);
  cursor: pointer;
  font-size: 12px;
  font-weight: 750;
}

.range-fields {
  margin-top: 11px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.range-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 10px;
  color: var(--ink-soft);
  font-size: 13px;
}

.validation-message {
  margin: 8px 0 0;
  color: var(--danger);
  font-size: 12px;
  font-weight: 700;
}

.add-step-button {
  width: calc(100% - 44px);
  margin-left: 44px;
  min-height: 50px;
  border-style: dashed;
  background: color-mix(in srgb, var(--accent) 22%, var(--paper-strong));
}

.natural-card {
  margin-top: 26px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.natural-actions {
  margin-top: 10px;
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

.parse-note {
  margin: 9px 0 0;
  color: var(--ink-soft);
  font-size: 12px;
}

.parse-note.is-warning { color: var(--danger); }

.side-section + .side-section {
  margin-top: 26px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.template-grid {
  display: grid;
  grid-template-columns: 1fr;
}

.template-button {
  width: 100%;
  min-height: 70px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--paper-strong);
  color: var(--ink);
  cursor: pointer;
  text-align: left;
}

.template-button:hover { border-color: var(--line-strong); }

.template-button strong,
.template-button span { display: block; }

.template-button span {
  margin-top: 2px;
  color: var(--ink-soft);
  font-size: 12px;
}

.saved-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.saved-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 40px;
  gap: 6px;
}

.saved-load {
  min-width: 0;
  padding: 9px 11px;
  border: 1px solid var(--line);
  border-radius: 11px;
  background: var(--paper-strong);
  color: var(--ink);
  cursor: pointer;
  text-align: left;
}

.saved-load strong,
.saved-load small {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.saved-load small { color: var(--ink-soft); }

.empty-note {
  margin: 0;
  color: var(--ink-soft);
  font-size: 13px;
}

.privacy-note {
  margin: 0;
  color: var(--ink-soft);
  font-size: 12px;
}

.toast {
  position: fixed;
  z-index: 200;
  left: 50%;
  bottom: calc(22px + env(safe-area-inset-bottom));
  max-width: calc(100% - 32px);
  padding: 11px 15px;
  border-radius: 12px;
  background: var(--ink);
  color: var(--paper-strong);
  box-shadow: var(--shadow);
  transform: translate(-50%, 20px);
  opacity: 0;
  pointer-events: none;
  transition: .2s ease;
}

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

.modal {
  width: min(calc(100% - 30px), 460px);
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--paper-strong);
  color: var(--ink);
  box-shadow: var(--shadow);
}

.modal::backdrop {
  background: rgba(5, 18, 16, .48);
  backdrop-filter: blur(4px);
}

.modal__inner { padding: 24px; }
.modal__inner h2 { margin: 0 0 6px; font-size: 22px; }
.modal__inner p { margin: 0 0 17px; color: var(--ink-soft); font-size: 14px; }
.modal__actions { margin-top: 18px; display: flex; justify-content: flex-end; gap: 8px; }

.content-section {
  max-width: 960px;
  margin: 0 auto;
  padding: 70px 0;
  border-top: 1px solid var(--line);
}

.content-section h2 {
  max-width: 720px;
  margin: 0 0 16px;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.15;
  letter-spacing: -.035em;
}

.content-section > p {
  max-width: 760px;
  color: var(--ink-soft);
  font-size: 17px;
}

.feature-grid,
.example-grid,
.link-grid {
  margin-top: 30px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.feature-card,
.example-card,
.link-card {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--paper-strong);
}

.feature-card h3,
.example-card h3,
.link-card h3 { margin: 0 0 7px; font-size: 17px; }

.feature-card p,
.example-card p,
.link-card p { margin: 0; color: var(--ink-soft); font-size: 14px; }

.example-result {
  margin-top: 16px !important;
  color: var(--ink) !important;
  font-size: 24px !important;
  font-weight: 850;
  font-variant-numeric: tabular-nums;
}

.link-card { text-decoration: none; transition: transform .18s ease; }
.link-card:hover { transform: translateY(-3px); }
.link-card__arrow { margin-top: 14px !important; color: var(--ink) !important; font-weight: 800; }

.faq-list {
  max-width: 820px;
  margin-top: 30px;
  display: grid;
  gap: 10px;
}

.faq-list details {
  padding: 0 18px;
  border: 1px solid var(--line);
  border-radius: 15px;
  background: var(--paper-strong);
}

.faq-list summary {
  padding: 17px 30px 17px 0;
  cursor: pointer;
  font-weight: 800;
}

.faq-list details p {
  margin: -2px 0 18px;
  color: var(--ink-soft);
}

.article-list { color: var(--ink-soft); }
.article-list li + li { margin-top: 8px; }

.site-footer {
  margin-top: 60px;
  border-top: 1px solid var(--line);
}

.site-footer__inner {
  width: min(calc(100% - 36px), var(--max));
  min-height: 140px;
  margin: 0 auto;
  padding: 30px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  color: var(--ink-soft);
  font-size: 13px;
}

.footer-links { display: flex; gap: 14px; flex-wrap: wrap; }

.noscript-note {
  max-width: 1040px;
  margin: 0 auto 30px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--paper-strong);
}

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

@media (max-width: 860px) {
  .site-nav a:not(.nav-priority):not(.language-switch) { display: none; }
  .hero { padding-top: 54px; }
  .editor-layout { grid-template-columns: 1fr; }
  .editor-side { border-left: 0; border-top: 1px solid var(--line); }
  .template-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .feature-grid, .example-grid, .link-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 600px) {
  .site-header__inner,
  .page-shell,
  .site-footer__inner { width: min(calc(100% - 24px), var(--max)); }
  .site-header__inner { min-height: 64px; }
  .brand__suffix { display: none; }
  .site-nav .nav-priority { display: none; }
  .site-nav .language-switch { display: inline-flex; }
  .button-small, .chip { min-height: 44px; }
  .hero { padding: 42px 0 28px; }
  .hero h1 { font-size: clamp(36px, 13vw, 55px); }
  .time-chain-app { border-radius: 22px; }
  .app-toolbar { padding: 10px 12px; }
  .app-title .local-badge { display: none; }
  .toolbar-actions .text-button { width: 44px; overflow: hidden; padding: 0; font-size: 0; }
  .toolbar-actions .text-button::first-letter { font-size: 16px; }
  .mode-switch { width: calc(100% - 24px); margin-top: 14px; }
  .result-hero { margin: 12px; padding: 25px 21px; }
  .result-time { font-size: clamp(58px, 22vw, 84px); }
  .result-meta { gap: 10px 18px; }
  .result-actions { display: grid; grid-template-columns: 1fr 1fr; }
  .result-actions button { width: 100%; }
  .editor-main { padding: 19px 14px 24px; }
  .editor-side { padding: 22px 14px; }
  .anchor-row { grid-template-columns: 1fr; }
  .step-main-fields { grid-template-columns: minmax(0, 1fr) 112px; }
  .step-card { padding: 12px; }
  .step-actions { align-items: flex-start; }
  .move-actions { width: 100%; justify-content: flex-start; }
  .add-step-button { width: calc(100% - 44px); }
  .template-grid { grid-template-columns: 1fr; }
  .feature-grid, .example-grid, .link-grid { grid-template-columns: 1fr; }
  .content-section { padding: 54px 0; }
  .site-footer__inner { min-height: 170px; align-items: flex-start; flex-direction: column; justify-content: center; }
}

@media (max-width: 380px) {
  .step-main-fields { grid-template-columns: 1fr; }
  .duration-unit { bottom: 12px; }
  .range-fields { grid-template-columns: 1fr; }
  .result-actions { grid-template-columns: 1fr; }
  .toolbar-actions { gap: 3px; }
}

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

@media print {
  .site-header, .site-footer, .app-toolbar, .mode-switch, .editor-side,
  .step-actions, .add-step-button, .natural-card, .result-actions { display: none !important; }
  body { background: white; color: black; }
  .time-chain-app { border: 0; box-shadow: none; }
  .result-hero { background: white; color: black; border: 2px solid black; }
  .result-day, .result-meta, .result-meta strong { color: black; }
}