/* LutiveLab Four-Color Brand & Editorial Homepage (LTL-HOME-4COLOR-20261027-01) */
:root {
  --brand-blue: #3B64F0;
  --brand-blue-hover: #294FD6;
  --brand-blue-tint: #E4EAFE;
  --brand-blue-soft: rgba(228, 234, 254, 0.45);
  --brand-blue-line: rgba(59, 100, 240, 0.35);

  --brand-green: #1E9E63;
  --brand-green-hover: #16804F;
  --brand-green-tint: #DDF3E8;
  --brand-green-soft: rgba(221, 243, 232, 0.45);
  --brand-green-line: rgba(30, 158, 99, 0.35);
  --brand-green-ink: #0F5C39;

  --brand-yellow: #E39A12;
  --brand-yellow-ink: #8A5A00;
  --brand-yellow-tint: #FCEFD2;
  --brand-yellow-soft: rgba(252, 239, 210, 0.5);
  --brand-yellow-line: rgba(227, 154, 18, 0.4);

  --brand-red: #E04467;
  --brand-red-tint: #FBE1E7;
  --brand-red-soft: rgba(251, 225, 231, 0.45);
  --brand-red-line: rgba(224, 68, 103, 0.35);

  --bg-canvas: #F4F5F7;
  --bg-surface: #FFFFFF;
  --bg-subtle: #EDEFF3;
  --bg-dark: #14171F;

  --ink-primary: #14171F;
  --ink-secondary: #565D6B;
  --ink-muted: #71798A;
  --ink-on-dark: #F4F5F7;
  --ink-on-dark-secondary: #C9CED8;
  --ink-on-dark-muted: #A9AFBB;

  --border-hairline: #DADDE3;
  --border-strong: #14171F;
  --border-dark: #3A4152;

  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "HarmonyOS Sans SC", "Hiragino Sans GB", "Noto Sans CJK SC", "Noto Sans SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
  --font-serif: "Songti SC", "Noto Serif SC", "STSong", "Source Han Serif SC", "SimSun", Georgia, "Times New Roman", serif;
  --font-mono: ui-monospace, "SFMono-Regular", "JetBrains Mono", Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  --nav-height: 64px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: auto;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body {
  margin: 0;
  font: 16px/1.7 var(--font-sans);
  background: var(--bg-canvas);
  color: var(--ink-primary);
  overflow-x: hidden;
}

@media (prefers-reduced-motion: no-preference) {
  main {
    animation: ltlPageFade 0.18s ease-out;
  }
  @keyframes ltlPageFade {
    from {
      opacity: 0.92;
      transform: translateY(1px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
  color: inherit;
  cursor: pointer;
}

h1, h2, h3, p {
  margin: 0;
}

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

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--brand-blue);
  outline-offset: 3px;
  border-radius: 4px;
}

#main {
  scroll-margin-top: var(--nav-height);
}

.container {
  width: 100%;
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 48px);
}

/* Skip Link */
.skip-link {
  position: fixed;
  left: 20px;
  top: -100px;
  z-index: 40;
  background: var(--bg-surface);
  color: var(--ink-primary);
  border: 2px solid var(--brand-blue);
  border-radius: 6px;
  padding: 10px 16px;
  font-weight: 600;
}

.skip-link:focus {
  top: 10px;
}

/* Site Header & Brand Mark */
.site-header {
  height: var(--nav-height);
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(244, 245, 247, 0.94);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-hairline);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-height: 44px;
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.brand:hover {
  text-decoration: none;
}

.brand-grid {
  display: grid;
  grid-template-columns: repeat(2, 10px);
  gap: 3px;
  flex: none;
}

.brand-sq {
  width: 10px;
  height: 10px;
  border-radius: 2px;
  display: block;
}

.brand-sq-blue { background: var(--brand-blue); }
.brand-sq-green { background: var(--brand-green); }
.brand-sq-yellow { background: var(--brand-yellow); }
.brand-sq-red { background: var(--brand-red); }

.desktop-nav {
  display: flex;
  gap: 28px;
  align-items: center;
}

.desktop-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 15px;
  color: var(--ink-secondary);
  border-bottom: 2px solid transparent;
}

.desktop-nav a:hover {
  color: var(--ink-primary);
  border-bottom-color: var(--ink-primary);
  text-decoration: none;
}

.lang-switch {
  font-family: var(--font-mono);
  font-size: 13px !important;
  font-weight: 500;
  min-height: 34px !important;
  padding: 0 10px;
  border-radius: 6px;
  border: 1px solid var(--border-hairline) !important;
  color: var(--ink-primary) !important;
  background: var(--bg-surface);
}

.lang-switch:hover {
  border-color: var(--ink-primary) !important;
  background: var(--bg-subtle);
}

.menu-toggle {
  display: none;
}

/* Buttons & Links */
.btn,
.button-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 44px;
  padding: 8px 20px;
  border-radius: 6px;
  background: var(--ink-primary);
  color: var(--bg-canvas);
  font-size: 15px;
  font-weight: 500;
  border: 1px solid var(--ink-primary);
  text-decoration: none;
}

.btn:hover,
.button-primary:hover {
  background: #2C3342;
  border-color: #2C3342;
  color: #FFFFFF;
  text-decoration: none;
}

.btn-blue {
  background: var(--brand-blue);
  border-color: var(--brand-blue);
  color: #FFFFFF;
}

.btn-blue:hover {
  background: var(--brand-blue-hover);
  border-color: var(--brand-blue-hover);
  color: #FFFFFF;
}

.btn-green {
  background: var(--brand-green);
  border-color: var(--brand-green);
  color: #FFFFFF;
}

.btn-green:hover {
  background: var(--brand-green-hover);
  border-color: var(--brand-green-hover);
  color: #FFFFFF;
}

.button-ghost,
.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 44px;
  padding: 8px 20px;
  border-radius: 6px;
  border: 1px solid var(--ink-primary);
  color: var(--ink-primary);
  background: transparent;
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
}

.button-ghost:hover,
.btn-ghost:hover {
  background: var(--bg-subtle);
  text-decoration: none;
}

.text-action {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  color: var(--ink-primary);
  font-size: 15px;
  font-weight: 500;
  text-decoration: underline;
  text-decoration-color: #A9AFBB;
  text-underline-offset: 5px;
}

.text-action:hover {
  text-decoration-color: var(--ink-primary);
}

/* Hero Section */
.hero {
  padding: clamp(48px, 6.5vw, 84px) 0 clamp(52px, 7vw, 88px);
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  gap: 48px 56px;
  align-items: center;
}

.hero-copy {
  display: flex;
  flex-direction: column;
  gap: 22px;
  min-width: 0;
}

.hero-intro {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--ink-secondary);
}

.hero h1 {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(44px, 5.6vw, 76px);
  line-height: 1.14;
  letter-spacing: -0.015em;
  color: var(--ink-primary);
  text-wrap: balance;
}

.mobile-break {
  display: none;
}

.brand-bar {
  display: flex;
  width: 168px;
  height: 6px;
  gap: 3px;
}

.brand-bar span {
  flex: 1;
  border-radius: 1px;
}

.brand-bar .bar-blue { background: var(--brand-blue); }
.brand-bar .bar-green { background: var(--brand-green); }
.brand-bar .bar-yellow { background: var(--brand-yellow); }
.brand-bar .bar-red { background: var(--brand-red); }

.hero-description {
  font-size: 18px;
  line-height: 1.75;
  color: var(--ink-secondary);
  max-width: 31em;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 16px;
}

.hero-journey-note {
  font-size: 14px;
  color: var(--ink-secondary);
  line-height: 1.6;
}

/* Hero Four-Question Demo Card */
.hero-demo-fold {
  min-width: 0;
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-radius: 10px;
}

.hero-demo-summary {
  display: none;
}

.hero-demo-card {
  padding: clamp(20px, 2.8vw, 30px);
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.demo-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
}

.demo-header h2 {
  font-size: 16px;
  font-weight: 700;
  color: var(--ink-primary);
}

.demo-badge {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink-secondary);
}

.demo-sentence {
  font-family: var(--font-serif);
  font-size: clamp(18px, 2vw, 21px);
  line-height: 1.95;
  font-weight: 600;
  color: var(--ink-primary);
}

.demo-seg {
  padding: 2px 3px;
  border-radius: 3px;
  transition: background-color 0.15s, box-shadow 0.15s;
}

.demo-seg[data-seg="0"] {
  background: var(--brand-blue-soft);
  box-shadow: inset 0 -2px 0 var(--brand-blue-line);
}
.demo-seg[data-seg="1"] {
  background: var(--brand-green-soft);
  box-shadow: inset 0 -2px 0 var(--brand-green-line);
}
.demo-seg[data-seg="2"] {
  background: var(--brand-yellow-soft);
  box-shadow: inset 0 -2px 0 var(--brand-yellow-line);
}
.demo-seg[data-seg="3"] {
  background: var(--brand-red-soft);
  box-shadow: inset 0 -2px 0 var(--brand-red-line);
}

.demo-seg.is-active[data-seg="0"] {
  background: var(--brand-blue-tint);
  box-shadow: inset 0 -3px 0 var(--brand-blue);
}
.demo-seg.is-active[data-seg="1"] {
  background: var(--brand-green-tint);
  box-shadow: inset 0 -3px 0 var(--brand-green);
}
.demo-seg.is-active[data-seg="2"] {
  background: var(--brand-yellow-tint);
  box-shadow: inset 0 -3px 0 var(--brand-yellow);
}
.demo-seg.is-active[data-seg="3"] {
  background: var(--brand-red-tint);
  box-shadow: inset 0 -3px 0 var(--brand-red);
}

/* Fixed 2x2 Question Button Grid */
.q-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.q-btn {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  min-height: 44px;
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 500;
  border: 1px solid var(--border-hairline);
  background: var(--bg-surface);
  color: var(--ink-primary);
  text-align: left;
}

.q-btn:hover {
  background: var(--bg-subtle);
}

.q-btn-main {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
}

.q-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex: none;
}

.q-dot-blue { background: var(--brand-blue); }
.q-dot-green { background: var(--brand-green); }
.q-dot-yellow { background: var(--brand-yellow); }
.q-dot-red { background: var(--brand-red); }

.q-role {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-secondary);
  flex: none;
}

.q-btn[aria-pressed="true"] {
  font-weight: 600;
}

.q-btn[data-q="0"][aria-pressed="true"] {
  border-color: var(--brand-blue);
  background: var(--brand-blue-tint);
  box-shadow: inset 0 0 0 1px var(--brand-blue);
}
.q-btn[data-q="1"][aria-pressed="true"] {
  border-color: var(--brand-green);
  background: var(--brand-green-tint);
  box-shadow: inset 0 0 0 1px var(--brand-green);
}
.q-btn[data-q="2"][aria-pressed="true"] {
  border-color: var(--brand-yellow);
  background: var(--brand-yellow-tint);
  box-shadow: inset 0 0 0 1px var(--brand-yellow);
}
.q-btn[data-q="3"][aria-pressed="true"] {
  border-color: var(--brand-red);
  background: var(--brand-red-tint);
  box-shadow: inset 0 0 0 1px var(--brand-red);
}

.q-explains {
  min-height: 3.4em;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.q-explain {
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--ink-secondary);
}

.q-explain strong {
  color: var(--ink-primary);
  font-weight: 600;
}

.js-enabled .q-explain:not(.is-active) {
  display: none;
}

.demo-cta {
  align-self: flex-start;
  font-size: 14.5px;
}

/* Generic Section Shell */
.section {
  border-top: 1px solid var(--border-hairline);
  padding: clamp(52px, 7vw, 88px) 0;
  scroll-margin-top: calc(var(--nav-height) + 12px);
}

.section:focus {
  outline: none;
}

.section-header {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: clamp(32px, 4.5vw, 44px);
}

.section-header h2 {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(28px, 3.8vw, 42px);
  line-height: 1.25;
  color: var(--ink-primary);
}

.section-header p {
  font-size: 17px;
  color: var(--ink-secondary);
  max-width: 42em;
}

/* Resources Section: 3 On-Demand Tool Cards + Template Short Bar */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

@supports (grid-template-rows: subgrid) {
  @media (min-width: 1001px) {
    .tools-grid {
      grid-template-rows: auto auto 1fr auto;
    }

    .tool-card {
      grid-row: span 4;
      display: grid;
      grid-template-rows: subgrid;
      row-gap: 16px;
    }

    .tool-actions {
      margin-top: 0;
      align-self: start;
    }
  }
}

.tool-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-radius: 10px;
  padding: 26px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-width: 0;
  position: relative;
}

.tool-card-blue {
  border-top: 3px solid var(--brand-blue);
}

.tool-card-neutral {
  border-top: 3px solid var(--ink-primary);
}

.tool-card-green {
  border-top: 3px solid var(--brand-green);
}

.tool-problem-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  align-self: flex-start;
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
}

.tool-tag-blue {
  background: var(--brand-blue-tint);
  color: #1F44BD;
}

.tool-tag-neutral {
  background: var(--bg-subtle);
  color: var(--ink-primary);
}

.tool-tag-green {
  background: var(--brand-green-tint);
  color: var(--brand-green-ink);
}

.tag-square {
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: currentColor;
}

.tag-four-dots {
  display: inline-grid;
  grid-template-columns: repeat(2, 6px);
  gap: 2px;
}

.tag-four-dots i {
  width: 6px;
  height: 6px;
  border-radius: 1.5px;
  display: block;
}

.tag-four-dots i:nth-child(1) { background: var(--brand-blue); }
.tag-four-dots i:nth-child(2) { background: var(--brand-green); }
.tag-four-dots i:nth-child(3) { background: var(--brand-yellow); }
.tag-four-dots i:nth-child(4) { background: var(--brand-red); }

.tool-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--ink-secondary);
}

.tool-title-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.tool-card h3 {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 600;
  color: var(--ink-primary);
}

.tool-lead {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 22px;
  line-height: 1.4;
  color: var(--ink-primary);
}

.tool-description {
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-secondary);
}

.tool-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 18px;
  margin-top: auto;
  padding-top: 6px;
}

/* Template Short Link Strip */
.template-strip {
  margin-top: 24px;
  padding: 18px 24px;
  background: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-radius: 10px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px 24px;
}

.template-strip-copy {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  flex: 1 1 360px;
  min-width: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--ink-secondary);
}

.template-strip-copy strong {
  color: var(--ink-primary);
  font-weight: 600;
}

.template-strip-badge {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 4px;
  background: var(--brand-yellow-tint);
  color: var(--brand-yellow-ink);
  white-space: nowrap;
  flex: none;
  margin-top: 2px;
}

.template-strip-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 20px;
}

/* Work / Apps Section */
.section-work {
  background: var(--bg-surface);
}

.work-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 32px;
}

.work-card {
  border-top: 2px solid var(--ink-primary);
  padding-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-width: 0;
  text-decoration: none;
}

.work-card:hover {
  text-decoration: none;
}

.work-card:hover .work-name,
.work-card:hover .work-link {
  text-decoration: underline;
  text-underline-offset: 5px;
}

.work-card-building {
  border-top: 2px dashed #A9AFBB;
}

.work-icon {
  width: 56px;
  height: 56px;
  border-radius: 12px;
  object-fit: contain;
  display: block;
}

.diary-mark {
  width: 56px;
  height: 56px;
  border-radius: 12px;
  border: 1px dashed #A9AFBB;
  background: var(--bg-canvas);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--ink-secondary);
}

.work-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 10px;
}

.work-name {
  font-family: var(--font-mono);
  font-size: 21px;
  font-weight: 600;
  color: var(--ink-primary);
}

.work-card-building .work-name {
  color: var(--ink-secondary);
}

.status-pill {
  font-size: 12px;
  font-weight: 600;
  padding: 2px 10px;
  border-radius: 999px;
}

.status-live {
  background: var(--brand-green-tint);
  color: var(--brand-green-ink);
}

.status-building {
  border: 1px dashed var(--ink-secondary);
  color: var(--ink-secondary);
}

.work-desc {
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--ink-primary);
}

.work-card-building .work-desc {
  color: var(--ink-secondary);
}

.work-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--ink-secondary);
}

.work-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  font-size: 15px;
  font-weight: 500;
  margin-top: auto;
}

/* Field Notes Section */
.notes-list {
  display: flex;
  flex-direction: column;
}

.note-row {
  border-top: 1px solid var(--ink-primary);
  padding: 32px 0;
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 16px 48px;
}

.note-row-draft {
  border-top-color: var(--border-hairline);
  border-bottom: 1px solid var(--border-hairline);
}

.note-meta {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink-secondary);
}

.note-meta-primary {
  color: var(--ink-primary);
  font-weight: 600;
}

.note-content {
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-width: 0;
}

.note-content h3 {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(21px, 2.4vw, 27px);
  line-height: 1.42;
  color: var(--ink-primary);
}

.note-content h3 a:hover {
  text-decoration: underline;
  text-underline-offset: 5px;
}

.note-description {
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--ink-secondary);
  max-width: 42em;
}

.note-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 24px;
}

.draft-excerpt {
  max-width: 42em;
}

.draft-excerpt summary {
  cursor: pointer;
  list-style: none;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  font-weight: 500;
  text-decoration: underline;
  text-decoration-color: #A9AFBB;
  text-underline-offset: 5px;
}

.draft-excerpt summary::-webkit-details-marker {
  display: none;
}

.draft-excerpt[open] .summary-icon {
  transform: rotate(45deg);
}

.summary-icon {
  display: inline-block;
  transition: transform 0.15s;
}

.excerpt-body {
  margin-top: 10px;
  padding-left: 16px;
  border-left: 2px solid var(--border-hairline);
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-secondary);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.excerpt-source {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-muted);
}

/* Dark About & Footer Section */
.section-dark-close {
  background: var(--bg-dark);
  color: var(--ink-on-dark);
  border-top: 0;
  padding: clamp(56px, 7vw, 88px) 0 32px;
}

.about-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 28px 64px;
  align-items: flex-end;
  justify-content: space-between;
  padding-bottom: clamp(40px, 5vw, 60px);
}

.about-copy {
  flex: 1 1 420px;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.about-copy h2 {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(28px, 3.8vw, 42px);
  line-height: 1.25;
  color: var(--ink-on-dark);
}

.about-copy p {
  font-size: clamp(17px, 1.9vw, 20px);
  line-height: 1.8;
  color: var(--ink-on-dark-secondary);
  max-width: 30em;
}

.btn-dark-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 44px;
  padding: 8px 20px;
  border-radius: 6px;
  border: 1px solid var(--ink-on-dark);
  color: var(--ink-on-dark);
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
}

.btn-dark-outline:hover {
  background: rgba(244, 245, 247, 0.12);
  text-decoration: none;
}

.site-footer {
  border-top: 1px solid var(--border-dark);
  padding-top: 22px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 8px 24px;
  font-size: 14px;
  color: var(--ink-on-dark-muted);
}

.footer-copy {
  font-family: var(--font-mono);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 24px;
}

.footer-links a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--ink-on-dark-secondary);
}

.footer-links a:hover {
  color: #FFFFFF;
  text-decoration: underline;
  text-underline-offset: 5px;
}

/* Mobile Menu Dialog */
dialog#mobile-menu {
  max-width: none;
  max-height: 100dvh;
  border: 0;
  margin: 0 0 0 auto;
  padding: 0;
  background: var(--bg-canvas);
  color: var(--ink-primary);
  height: 100dvh;
  width: min(100%, 390px);
}

dialog#mobile-menu::backdrop {
  background: rgba(20, 23, 31, 0.35);
}

.mobile-menu-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 20px;
  border-bottom: 1px solid var(--border-hairline);
}

.menu-close {
  border: 0;
  background: transparent;
  min-height: 44px;
  min-width: 66px;
  font-size: 14px;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
}

dialog#mobile-menu nav {
  padding: 16px 20px;
}

dialog#mobile-menu nav a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 56px;
  font-size: 19px;
  font-weight: 500;
  border-bottom: 1px solid var(--border-hairline);
}

.mobile-lang-link {
  font-family: var(--font-mono);
  color: var(--brand-blue);
  font-size: 16px !important;
}

dialog#mobile-menu > p {
  padding: 8px 20px;
  font-size: 13px;
  color: var(--ink-secondary);
}

body.menu-open {
  overflow-y: hidden;
}

/* Tablet Breakpoint */
@media (max-width: 1000px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .tools-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .work-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .note-row {
    grid-template-columns: 1fr;
    gap: 10px;
  }
}

/* Mobile Breakpoint (320px - 760px) */
@media (max-width: 760px) {
  :root {
    --nav-height: 56px;
  }

  .container {
    padding-inline: 20px;
  }

  .desktop-nav {
    display: none;
  }

  .menu-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    font-size: 14px;
    font-weight: 500;
    background: transparent;
    border: 1px solid var(--border-hairline);
    border-radius: 6px;
    min-height: 44px;
    padding: 0 12px;
  }

  .hero {
    padding: 26px 0 28px;
    gap: 18px;
  }

  .hero-copy {
    gap: 14px;
  }

  .hero-intro {
    font-size: 12px;
  }

  .hero h1 {
    font-size: clamp(34px, 9.2vw, 40px);
    line-height: 1.22;
  }

  .mobile-break {
    display: block;
  }

  .desktop-break {
    display: none;
  }

  .brand-bar {
    width: 136px;
    height: 5px;
  }

  .hero-description {
    font-size: 15px;
    line-height: 1.65;
  }

  .hero-actions {
    gap: 10px;
  }

  .hero-actions .btn,
  .hero-actions .button-primary,
  .hero-actions .button-ghost {
    padding: 8px 16px;
    font-size: 14px;
  }

  .hero-journey-note {
    font-size: 13px;
  }

  /* Collapsible Four-Question Demo on Mobile */
  .hero-demo-summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    min-height: 48px;
    padding: 10px 16px;
    cursor: pointer;
    list-style: none;
    font-size: 14px;
    font-weight: 600;
    color: var(--ink-primary);
  }

  .hero-demo-summary::-webkit-details-marker {
    display: none;
  }

  .summary-title-group {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
  }

  .summary-toggle-label {
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 500;
    color: var(--brand-blue);
    white-space: nowrap;
  }

  .hero-demo-fold[open] .hero-demo-summary {
    border-bottom: 1px solid var(--border-hairline);
  }

  .hero-demo-card {
    padding: 18px 16px;
    gap: 16px;
  }

  .section {
    padding: 32px 0 36px;
  }

  .section-header {
    margin-bottom: 22px;
  }

  .section-header h2 {
    font-size: 26px;
  }

  .section-header p {
    font-size: 14.5px;
  }

  .tool-card {
    padding: 20px;
    gap: 12px;
  }

  .tool-lead {
    font-size: 20px;
  }

  .template-strip {
    padding: 16px 18px;
  }

  .work-card {
    padding-top: 18px;
    gap: 10px;
  }

  .work-icon,
  .diary-mark {
    width: 48px;
    height: 48px;
  }

  .note-row {
    padding: 24px 0;
  }
}

@media (max-width: 350px) {
  .container {
    padding-inline: 14px;
  }

  .hero h1 {
    font-size: 31px;
  }

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

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *, *::before, *::after {
    transition: none !important;
    animation: none !important;
  }
}