/* =============================================================
   life-design-coach — stylesheet
   Scholarly Editorial Minimalism · warm, inviting
   ============================================================= */

/* ──────────────────────────── fonts ──────────────────────────── */
@font-face {
  font-family: 'Fraunces';
  font-style: normal;
  font-weight: 300 700;
  font-display: swap;
  src: url('/fonts/fraunces.woff2') format('woff2');
}
@font-face {
  font-family: 'Fraunces';
  font-style: italic;
  font-weight: 300 700;
  font-display: swap;
  src: url('/fonts/fraunces-italic.woff2') format('woff2');
}
@font-face {
  font-family: 'JetBrains Mono';
  font-style: normal;
  font-weight: 400 500;
  font-display: swap;
  src: url('/fonts/jetbrains-mono.woff2') format('woff2');
}

/* ──────────────────────────── reset ──────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
img, svg { display: block; max-width: 100%; }
button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; padding: 0; }
a { color: inherit; }
ul, ol, dl { margin: 0; padding: 0; list-style: none; }

/* ──────────────────────────── tokens (light) ─────────────────── */
:root {
  /* ink & paper — warmer, sepia-leaning */
  --ink: #2b1f14;
  --ink-soft: #4a3a2c;
  --ink-mute: #8a7e70;
  --paper: #fbf6ec;
  --paper-warm: #f3ead9;
  --paper-deep: #ebe0cb;

  /* accent */
  --amber: #c0732a;
  --amber-soft: #d8a068;

  /* lines */
  --rule: rgba(43, 31, 20, 0.14);
  --rule-soft: rgba(43, 31, 20, 0.06);

  /* typography */
  --font-display: 'Fraunces', 'Songti SC', 'STSong', 'SimSun', serif;
  --font-body: 'Fraunces', 'PingFang SC', -apple-system, BlinkMacSystemFont, 'Noto Serif CJK SC', serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Menlo, Consolas, monospace;

  /* layout */
  --container: 1120px;
  --container-narrow: 720px;
  --gutter: clamp(1.5rem, 4vw, 3rem);

  color-scheme: light;
}

/* ──────────────────────────── tokens (dark) ──────────────────── */
[data-theme="dark"] {
  --ink: #f3ead9;
  --ink-soft: #c9bfb1;
  --ink-mute: #8a7e70;
  --paper: #14100a;
  --paper-warm: #1f1811;
  --paper-deep: #2a2218;
  --amber: #d8a068;
  --amber-soft: #c0732a;
  --rule: rgba(243, 234, 217, 0.15);
  --rule-soft: rgba(243, 234, 217, 0.06);
  color-scheme: dark;
}

@media (prefers-color-scheme: dark) {
  [data-theme="auto"] {
    --ink: #f3ead9;
    --ink-soft: #c9bfb1;
    --ink-mute: #8a7e70;
    --paper: #14100a;
    --paper-warm: #1f1811;
    --paper-deep: #2a2218;
    --amber: #d8a068;
    --amber-soft: #c0732a;
    --rule: rgba(243, 234, 217, 0.15);
    --rule-soft: rgba(243, 234, 217, 0.06);
    color-scheme: dark;
  }
}

/* ──────────────────────────── base ───────────────────────────── */
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.65;
  font-variation-settings: "opsz" 14, "SOFT" 0, "WONK" 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  transition: background 0.3s ease, color 0.3s ease;
}

/* paper grain overlay */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: 0.55;
  background-image: url("data:image/svg+xml;utf8,<svg viewBox='0 0 240 240' xmlns='http://www.w3.org/2000/svg'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.92' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0  0 0 0 0 0  0 0 0 0 0  0 0 0 0.14 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
  mix-blend-mode: multiply;
  transition: opacity 0.3s ease;
}

[data-theme="dark"] body::before { mix-blend-mode: screen; opacity: 0.18; }
@media (prefers-color-scheme: dark) {
  [data-theme="auto"] body::before { mix-blend-mode: screen; opacity: 0.18; }
}

.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--ink);
  color: var(--paper);
  padding: 8px 16px;
  z-index: 100;
  text-decoration: none;
}
.skip-link:focus { top: 0; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5.5rem;
}

::selection {
  background: var(--amber);
  color: var(--paper);
}

:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ──────────────────────────── nav ────────────────────────────── */
.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  backdrop-filter: saturate(160%) blur(12px);
  -webkit-backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid var(--rule);
  transition: background 0.3s ease;
}

.nav__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 1.1rem var(--gutter);
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1.5rem;
}

.nav__logo {
  display: inline-flex;
  align-items: baseline;
  gap: 0.5rem;
  text-decoration: none;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 500;
  letter-spacing: -0.015em;
}

.nav__symbol {
  width: 18px;
  height: 18px;
  color: var(--amber);
  display: inline-block;
  transform: translateY(3px);
  flex-shrink: 0;
}

.nav__dot { color: var(--amber); font-style: italic; }

.nav__right {
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

.nav__links {
  display: flex;
  gap: 1.5rem;
  align-items: center;
  font-size: 0.9rem;
}

.nav__link {
  text-decoration: none;
  color: var(--ink-soft);
  position: relative;
  transition: color 0.2s;
}

.nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0;
  height: 1px;
  background: currentColor;
  transition: width 0.25s ease;
}

.nav__link:hover { color: var(--ink); }
.nav__link:hover::after { width: 100%; }

.nav__github {
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-soft);
  transition: color 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 0.35em;
}

.nav__github:hover { color: var(--ink); }

/* theme toggle — icon swapped via CSS based on data-theme */
.theme-toggle {
  width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  color: var(--ink-soft);
  font-size: 1.35rem;
  line-height: 1;
  transition: color 0.2s, background 0.2s, transform 0.3s ease;
  align-self: center;
}

.theme-toggle::before {
  content: "◐";
  display: inline-block;
}

[data-theme="light"] .theme-toggle::before { content: "☀"; }
[data-theme="dark"]  .theme-toggle::before { content: "☾"; }

.theme-toggle:hover {
  color: var(--amber);
  background: var(--paper-warm);
  transform: rotate(15deg);
}

.theme-toggle[data-state="light"],
.theme-toggle[data-state="dark"] { color: var(--amber); }

@media (max-width: 560px) {
  .nav__links { display: none; }
  .nav__right { gap: 0.8rem; }
}

/* ──────────────────────────── section head ───────────────────── */
.section-head {
  max-width: var(--container);
  margin: 0 auto 4.5rem;
  padding: 0 var(--gutter);
}

.section-num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-mute);
  display: inline-block;
  margin-bottom: 1rem;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5.2vw, 3.6rem);
  font-weight: 400;
  line-height: 1.02;
  letter-spacing: -0.028em;
  margin: 0 0 0.6rem;
  font-variation-settings: "opsz" 72, "SOFT" 0, "WONK" 1;
}

.section-title__ital {
  font-style: italic;
  color: var(--amber);
  font-variation-settings: "opsz" 72, "SOFT" 100, "WONK" 1;
}

.section-sub {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 0.92rem;
  color: var(--ink-mute);
  max-width: 34ch;
  margin: 0;
  font-variation-settings: "opsz" 14, "SOFT" 100, "WONK" 0;
}

/* ──────────────────────────── hero ───────────────────────────── */
.hero {
  position: relative;
  max-width: var(--container);
  margin: 0 auto;
  padding: clamp(3rem, 10vw, 7rem) var(--gutter) clamp(5rem, 14vw, 11rem);
  min-height: 82vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.hero__grid {
  position: relative;
  max-width: 48rem;
}

.hero__meta {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--ink-mute);
  display: flex;
  gap: 0.85rem;
  align-items: center;
  margin: 0 0 1.5rem;
  animation: fadeUp 0.8s ease both;
}

.hero__divider { color: var(--rule); }

.hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 8.5vw, 6.2rem);
  font-weight: 400;
  line-height: 1.04;
  letter-spacing: -0.04em;
  margin: 0 0 2.2rem;
  font-variation-settings: "opsz" 144, "SOFT" 0, "WONK" 1;
}

.hero__title-line {
  display: block;
  animation: fadeUp 0.9s ease both;
}

.hero__title-line:nth-child(1) { animation-delay: 0.15s; }

.hero__title-line--italic {
  font-style: italic;
  color: var(--amber);
  font-variation-settings: "opsz" 144, "SOFT" 100, "WONK" 1;
  animation-delay: 0.3s;
}

.hero__title-stop {
  color: var(--ink);
  font-style: normal;
}

.hero__sub {
  font-size: 1.14rem;
  max-width: 44ch;
  color: var(--ink-soft);
  line-height: 1.6;
  margin: 0 0 2.5rem;
  animation: fadeUp 0.9s 0.45s ease both;
}

.hero__sub em {
  font-style: italic;
  color: var(--ink-mute);
  font-size: 0.94em;
  display: inline-block;
  margin-bottom: 0.2em;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.75rem;
  align-items: center;
  animation: fadeUp 0.9s 0.6s ease both;
}

.btn-copy {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  padding: 0.95rem 1.5rem 1rem;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  border-radius: 3px;
  transition: transform 0.2s ease, background 0.25s, box-shadow 0.25s;
  box-shadow: 0 1px 0 rgba(43, 31, 20, 0.06), 0 8px 20px -12px rgba(43, 31, 20, 0.3);
  position: relative;
}

.btn-copy:hover {
  transform: translateY(-1px);
  background: var(--amber);
  box-shadow: 0 8px 22px -10px rgba(192, 115, 42, 0.5);
}

.btn-copy:active { transform: translateY(0); }

.btn-copy__icon {
  font-family: var(--font-mono);
  transition: transform 0.25s ease;
  display: inline-block;
}

.btn-copy:hover .btn-copy__icon { transform: translateX(4px); }

.btn-copy[data-copied="true"] {
  background: var(--amber);
  pointer-events: none;
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 0.92rem;
  padding-bottom: 3px;
  border-bottom: 1px solid var(--rule);
  transition: border-color 0.25s, color 0.25s;
}

.btn-ghost:hover {
  border-color: var(--ink);
  color: var(--ink);
}

/* compass mark */
.hero__mark {
  position: absolute;
  top: 54%;
  right: -4%;
  transform: translateY(-50%);
  width: min(400px, 44vw);
  aspect-ratio: 1;
  color: var(--amber);
  pointer-events: none;
  opacity: 0;
  animation: fadeInCompass 1.8s 0.3s ease both, slowSpin 180s linear infinite;
}

.hero__mark svg circle { stroke-width: 1.4; }
.hero__mark svg circle + circle { stroke-width: 0.6; }

@media (max-width: 900px) {
  .hero__mark { display: none; }
}

@keyframes fadeInCompass { to { opacity: 0.18; } }
@keyframes slowSpin { to { transform: translateY(-50%) rotate(360deg); } }

.hero__scroll {
  position: absolute;
  bottom: 2.5rem;
  left: var(--gutter);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin: 0;
}

.hero__scroll-arrow {
  animation: bounce 2.2s ease-in-out infinite;
}

@media (max-width: 768px) {
  .hero__scroll { display: none; }
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); opacity: 0.5; }
  50% { transform: translateY(4px); opacity: 1; }
}

/* ──────────────────────────── about ──────────────────────────── */
.about {
  padding: 7.5rem var(--gutter);
  border-top: 1px solid var(--rule);
  background: var(--paper-warm);
  transition: background 0.3s ease;
}

.about__grid {
  max-width: var(--container);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  position: relative;
}

.about__grid::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--rule);
}

@media (max-width: 768px) {
  .about__grid { grid-template-columns: 1fr; gap: 3rem; }
  .about__grid::before { display: none; }
}

.col__title {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 500;
  color: var(--amber);
  font-style: italic;
  margin: 0 0 1.6rem;
  letter-spacing: -0.01em;
}

.col--inverse .col__title {
  color: var(--ink-soft);
  font-style: italic;
}

.col__list {
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}

.col__list li {
  font-size: 1rem;
  line-height: 1.6;
  padding-left: 1.4rem;
  position: relative;
}

.col__list li::before {
  content: "—";
  position: absolute;
  left: 0;
  top: -0.05em;
  color: var(--ink-mute);
}

.col__list strong {
  font-weight: 500;
  color: var(--amber);
  font-style: italic;
}

.col--inverse .col__list strong {
  color: var(--ink);
  font-style: normal;
  font-weight: 500;
}

/* ──────────────────────────── credo ──────────────────────────── */
.credo {
  padding: 7.5rem 0 8rem;
  border-top: 1px solid var(--rule);
}

.credo__list {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: grid;
  grid-template-columns: 1fr;
}

.credo__item {
  display: grid;
  grid-template-columns: 3.5rem 1fr;
  gap: 1.5rem;
  padding: 2.2rem 0;
  border-top: 1px solid var(--rule);
  align-items: start;
}

.credo__item:first-child { border-top: none; padding-top: 0; }

.credo__num {
  font-family: var(--font-display);
  font-size: 2rem;
  font-style: italic;
  color: var(--amber);
  line-height: 1;
  font-variation-settings: "opsz" 72, "SOFT" 100, "WONK" 1;
  padding-top: 0.35rem;
  letter-spacing: -0.02em;
}

.credo__body h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 500;
  margin: 0 0 0.4rem;
  letter-spacing: -0.015em;
  line-height: 1.3;
}

.credo__body p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.96rem;
  line-height: 1.55;
}

/* ──────────────────────────── rhythm ─────────────────────────── */
.rhythm {
  padding: 7.5rem var(--gutter) 6rem;
  border-top: 1px solid var(--rule);
  background: var(--paper-warm);
  overflow: hidden;
  transition: background 0.3s ease;
}

.rhythm__wrap {
  max-width: var(--container);
  margin: 0 auto;
}

.rhythm__timeline {
  display: flex;
  flex-direction: column;
  gap: 3.2rem;
}

.phase {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 2rem;
  align-items: start;
}

@media (max-width: 768px) {
  .phase { grid-template-columns: 1fr; gap: 1rem; }
}

.phase__head {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.phase__desc {
  margin: 0.7rem 0 0;
  font-size: 0.88rem;
  line-height: 1.65;
  color: var(--ink-soft);
  font-family: var(--font-display);
  font-style: normal;
}

.phase__label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--amber);
}

.phase__name {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 500;
  font-style: italic;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.phase__weeks {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--ink-mute);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-top: 0.3rem;
}

.phase__nodes {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  position: relative;
  gap: 0;
  padding-top: 0.2rem;
}

.phase__nodes::before {
  content: "";
  position: absolute;
  left: 7px;
  right: 7px;
  top: calc(0.2rem + 7px);
  height: 1px;
  background: var(--rule);
  z-index: 0;
}

.node {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.5rem;
  padding: 0 1rem 0 0;
  margin-right: 1.5rem;
  min-width: 120px;
  position: relative;
  flex: 0 0 auto;
  z-index: 1;
}

.node__dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--paper-warm);
  border: 1.5px solid var(--ink);
  flex-shrink: 0;
  transition: transform 0.2s ease, background 0.2s;
}

.node--emphasis .node__dot {
  background: var(--amber);
  border-color: var(--amber);
  width: 18px;
  height: 18px;
  box-shadow: 0 0 0 4px var(--paper-warm), 0 0 0 5px var(--amber-soft);
  margin-top: -2px;
}

.node:hover .node__dot {
  transform: scale(1.15);
  background: var(--ink);
}

.node--emphasis:hover .node__dot { background: var(--amber); }

.node__name {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 500;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.node__en {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 0.82rem;
  color: var(--ink-mute);
  max-width: 14ch;
  line-height: 1.35;
}

.rhythm__note {
  margin: 3rem 0 0;
  padding: 1.2rem 0 0;
  border-top: 1px solid var(--rule-soft);
  font-size: 0.94rem;
  color: var(--ink-soft);
  font-style: italic;
  font-family: var(--font-display);
  line-height: 1.7;
}

.rhythm__note-mark {
  color: var(--amber);
  font-size: 1.3em;
  margin-right: 0.5em;
  font-style: normal;
  font-weight: 500;
  display: inline-block;
  vertical-align: -0.08em;
  line-height: 1;
}

.rhythm__note strong {
  color: var(--ink);
  font-weight: 500;
  font-style: italic;
}

/* emphasis 节点的上标 † 与 note 的 † 视觉呼应 */
.node__mark {
  color: var(--amber);
  font-size: 0.75em;
  margin-left: 0.18em;
  font-weight: 500;
  font-style: italic;
  vertical-align: super;
  line-height: 0;
}

/* ──────────────────────────── start ──────────────────────────── */
.start {
  padding: 7.5rem var(--gutter);
  border-top: 1px solid var(--rule);
}

.start__grid {
  max-width: var(--container);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 4rem;
}

@media (max-width: 900px) {
  .start__grid { grid-template-columns: 1fr; gap: 3.2rem; }
}

.start__col { min-width: 0; }
.start__col header { margin-bottom: 1.5rem; }

.start__title {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 500;
  margin: 0 0 0.25rem;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.start__sub {
  font-family: var(--font-display);
  font-style: italic;
  color: var(--ink-mute);
  margin: 0;
  font-size: 0.98rem;
}

.codeblock {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  background: var(--ink);
  color: var(--paper);
  padding: 1.5rem 1.75rem;
  border-radius: 3px;
  overflow-x: auto;
  line-height: 1.85;
  margin: 0 0 1.2rem;
  position: relative;
  border-left: 3px solid var(--amber);
  box-shadow: 0 1px 0 rgba(43, 31, 20, 0.04), 0 12px 32px -18px rgba(43, 31, 20, 0.3);
}

.codeblock::before {
  content: "— bash —";
  position: absolute;
  top: 0.5rem;
  right: 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--paper) 35%, transparent);
}

.codeblock code { display: block; white-space: pre; font-family: inherit; }

@media (max-width: 600px) {
  .codeblock {
    padding: 1.1rem 1.2rem;
    font-size: 0.78rem;
    line-height: 1.75;
  }
  .codeblock::before { font-size: 0.55rem; }
}

.start__detail {
  color: var(--ink-soft);
  font-size: 0.9rem;
  line-height: 1.65;
  margin: 0.8rem 0 0;
}

.quote {
  font-style: italic;
  color: var(--amber);
  font-family: var(--font-display);
}

.start__detail code {
  font-family: var(--font-mono);
  font-size: 0.82em;
  background: var(--paper-deep);
  padding: 0.1em 0.45em;
  border-radius: 2px;
  color: var(--ink);
}

.start__tools {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

.start__tools dt {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1rem;
  color: var(--ink);
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--rule-soft);
}

.start__tools dt:first-of-type {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}

.start__tools dd {
  margin: 0.25rem 0 0;
  padding-left: 0;
  color: var(--ink-soft);
  font-size: 0.92rem;
  line-height: 1.55;
}

.start__tools code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--paper-deep);
  padding: 0.08em 0.4em;
  border-radius: 2px;
  color: var(--ink);
}

/* ──────────────────────────── ideas ──────────────────────────── */
.ideas {
  padding: 7.5rem var(--gutter);
  border-top: 1px solid var(--rule);
  background: var(--paper-warm);
  transition: background 0.3s ease;
}

.ideas__list {
  max-width: var(--container);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2.8rem;
}

@media (max-width: 900px) {
  .ideas__list { grid-template-columns: 1fr; gap: 2.4rem; }
}

.idea {
  padding-top: 1.5rem;
  border-top: 2px solid var(--ink);
  position: relative;
}

.idea__num {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin: 0 0 1.2rem;
}

.idea h3 {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 500;
  margin: 0 0 1rem;
  letter-spacing: -0.015em;
  line-height: 1.25;
}

.idea p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.96rem;
  line-height: 1.6;
}

/* ──────────────────────────── repo CTA ───────────────────────── */
.repo {
  padding: 7rem var(--gutter) 8rem;
  border-top: 1px solid var(--rule);
  text-align: center;
  position: relative;
}

.repo__inner {
  max-width: var(--container-narrow);
  margin: 0 auto;
}

.repo__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin: 0 0 1.25rem;
}

.repo__title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4.6vw, 2.8rem);
  font-weight: 400;
  letter-spacing: -0.025em;
  margin: 0 0 1.2rem;
  line-height: 1.15;
}

.repo__title em {
  font-style: italic;
  color: var(--amber);
  font-variation-settings: "opsz" 72, "SOFT" 100, "WONK" 1;
}

.repo__sub {
  color: var(--ink-soft);
  max-width: 52ch;
  margin: 0 auto 2.2rem;
  font-size: 1rem;
}

.repo__btn {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  padding: 1rem 1.9rem;
  border: 1px solid var(--ink);
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 500;
  color: var(--ink);
  text-decoration: none;
  transition: all 0.3s ease;
  border-radius: 3px;
  background: transparent;
}

.repo__btn:hover {
  background: var(--ink);
  color: var(--paper);
  letter-spacing: 0.015em;
  gap: 1rem;
}

/* ──────────────────────────── footer ─────────────────────────── */
.footer {
  padding: 4rem var(--gutter) 3rem;
  border-top: 1px solid var(--rule);
  background: var(--paper-deep);
  font-size: 0.86rem;
  transition: background 0.3s ease;
}

.footer__inner {
  max-width: var(--container);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: start;
}

@media (max-width: 640px) {
  .footer__inner { grid-template-columns: 1fr; }
}

.footer__credo {
  color: var(--ink-soft);
  line-height: 1.75;
  margin: 0;
}

.footer__credo em {
  font-style: italic;
  color: var(--ink-mute);
  font-family: var(--font-display);
}

.footer__backlink {
  margin: 1.4rem 0 0;
  font-family: var(--font-display);
  font-style: italic;
  font-size: 0.98rem;
}

.footer__backlink a {
  color: var(--ink);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 2px;
  transition: color 0.25s, border-color 0.25s;
}

.footer__backlink a:hover {
  color: var(--amber);
  border-bottom-color: var(--amber);
}

.footer__backlink-arrow {
  display: inline-block;
  transition: transform 0.25s;
  font-family: var(--font-mono);
  font-style: normal;
}

.footer__backlink a:hover .footer__backlink-arrow {
  transform: translateX(-3px);
}

.footer__meta {
  color: var(--ink-soft);
  line-height: 1.75;
  margin: 0;
  text-align: right;
}

@media (max-width: 640px) {
  .footer__meta { text-align: left; }
}

.footer__meta a {
  font-family: var(--font-mono);
  font-size: 0.88em;
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--rule);
  transition: text-decoration-color 0.25s;
}

.footer__meta a:hover { text-decoration-color: var(--amber); }

.footer__beian {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75em;
  margin-top: 0.6rem;
  letter-spacing: 0.02em;
  line-height: 1.8;
}

.footer__icp {
  color: var(--ink-mute);
  text-decoration: none;
  transition: color 0.2s;
}

.footer__icp:hover {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.footer__icp-sep {
  color: var(--rule);
  margin: 0 0.5em;
}

@media (max-width: 640px) {
  .footer__icp-sep { display: none; }
  .footer__icp { display: inline-block; margin-right: 0.8em; }
}

/* ──────────────────────────── animations ─────────────────────── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ──────────────────────────── motion pref ────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .hero__mark { display: none; }
}