/* Yushio intro page · styles
   Two switchable axes: data-lang ("cn" | "en") and data-theme ("dark" | "light").
   Other variations (palette, motion) were retired — motion respects
   prefers-reduced-motion via @media query at the bottom of this file. */

/* ─── Tokens · default (dark) ───────────────────────────────────────────── */
:root,
[data-theme="dark"] {
  --bg: #0e0b08;
  --bg-elev: #161210;
  --bg-elev-2: #1c1715;
  --fg: #f4ede0;
  --fg-mute: rgba(244, 237, 224, 0.66);
  --fg-dim:  rgba(244, 237, 224, 0.36);
  --line:        rgba(244, 237, 224, 0.10);
  --line-strong: rgba(244, 237, 224, 0.22);
  --accent:       #ff7849;   /* dusk orange */
  --accent-2:     #ffb277;   /* soft amber */
  --accent-soft:  rgba(255, 120, 73, 0.16);
  --accent-glow:  rgba(255, 120, 73, 0.32);
  --counter:      #f7d774;
  --terminal-bg:  #050505;
  --terminal-fg:  #f0e9da;
}

[data-theme="light"] {
  --bg: #faf6ef;
  --bg-elev: #ffffff;
  --bg-elev-2: #f3ece1;
  --fg: #1a1410;
  --fg-mute: rgba(26, 20, 16, 0.66);
  --fg-dim:  rgba(26, 20, 16, 0.34);
  --line:        rgba(26, 20, 16, 0.10);
  --line-strong: rgba(26, 20, 16, 0.22);
  --accent:       #c14a1c;
  --accent-2:     #d96f33;
  --accent-soft:  rgba(193, 74, 28, 0.12);
  --accent-glow:  rgba(193, 74, 28, 0.22);
  --counter:      #ad7a08;
  --terminal-bg:  #1a1410;
  --terminal-fg:  #faf6ef;
}

:root {
  --max: 1180px;
  --pad-x: clamp(20px, 4vw, 56px);

  --serif: "Spectral", "Noto Serif SC", "Songti SC", "STSong", ui-serif, serif;
  --sans:  "Manrope", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", ui-sans-serif, system-ui, sans-serif;
  --mono:  "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --r-sm: 6px;
  --r-md: 12px;
  --r-lg: 20px;

  --t-slow: 600ms cubic-bezier(.2,.7,.2,1);
  --t-med:  300ms cubic-bezier(.2,.7,.2,1);
}

/* ─── Reset / globals ───────────────────────────────────────────────────── */
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--fg);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  transition: background var(--t-med), color var(--t-med);
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
p { margin: 0; }
h1, h2, h3, h4 { margin: 0; font-weight: 500; }
img, svg { display: block; max-width: 100%; }

::selection { background: var(--accent-soft); color: var(--fg); }

/* ─── Layout helpers ────────────────────────────────────────────────────── */
.wrap   { max-width: var(--max); margin: 0 auto; padding: 0 var(--pad-x); }
.wrap-w { max-width: 1320px;     margin: 0 auto; padding: 0 var(--pad-x); }

.section {
  position: relative;
  padding: clamp(64px, 12vh, 140px) 0;
  border-top: 1px solid var(--line);
}
.section-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fg-dim);
  margin-bottom: 28px;
}
.section-headline {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(32px, 5.4vw, 68px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--fg);
  margin-bottom: 22px;
  text-wrap: balance;
}
.section-headline em {
  font-style: italic;
  color: var(--accent);
}
[data-lang="cn"] .section-headline { letter-spacing: 0.005em; }
.section-headline .l2 { display: block; color: var(--fg-mute); }

/* ─── Top nav ───────────────────────────────────────────────────────────── */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  height: 56px;
}
.nav-brand {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--serif);
  font-size: 18px;
  letter-spacing: 0.01em;
  flex-shrink: 0;
}
.nav-brand .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
  flex-shrink: 0;
}
.nav-brand .brand-sub {
  color: var(--fg-dim);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  margin-left: 4px;
}
.nav-links {
  display: flex; gap: 28px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  flex: 1;
  justify-content: center;
  min-width: 0;
}
.nav-links a {
  color: var(--fg-mute);
  transition: color var(--t-med);
  white-space: nowrap;
}
.nav-links a:hover { color: var(--fg); }
.nav-cta {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 14px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-size: 12px;
  font-family: var(--mono);
  letter-spacing: 0.05em;
  transition: all var(--t-med);
  flex-shrink: 0;
}
.nav-cta:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.nav-cta svg { width: 14px; height: 14px; }

/* Settings toggles (lang + theme) — sit left of GitHub cta */
.nav-right {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.nav-settings {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.nav-toggle {
  display: inline-flex;
  align-items: center;
  padding: 2px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: color-mix(in srgb, var(--bg-elev) 64%, transparent);
  transition: border-color var(--t-med);
}
.nav-toggle:hover { border-color: var(--line-strong); }
.nav-toggle button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 26px;
  height: 22px;
  padding: 0 8px;
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--fg-mute);
  transition: color var(--t-med), background var(--t-med);
}
.nav-toggle button:hover { color: var(--fg); }
.nav-toggle button.is-active {
  color: var(--accent);
  background: var(--accent-soft);
}
.nav-toggle svg { display: block; }

/* ─── Hero ──────────────────────────────────────────────────────────────── */
.hero {
  position: relative;
  padding: clamp(40px, 10vh, 110px) 0 clamp(80px, 18vh, 160px);
  overflow: hidden;
  isolation: isolate;
}
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}
.hero-glow {
  position: absolute;
  width: min(1200px, 200vw);
  height: min(1200px, 200vw);
  left: 50%; top: -40%;
  transform: translate(-50%, 0);
  background: radial-gradient(circle at center, var(--accent-glow), transparent 60%);
  filter: blur(40px);
  opacity: 0.55;
}
.hero-tide {
  position: absolute;
  inset: auto 0 0 0;
  width: 100%;
  height: 60%;
  opacity: 0.5;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-size: clamp(11px, 1.2vw, 12px);
  letter-spacing: 0.06em;
  color: var(--fg-mute);
  padding: 6px 14px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: color-mix(in srgb, var(--bg-elev) 60%, transparent);
  max-width: 100%;
}
.hero-eyebrow .pulse {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 0 var(--accent);
  animation: pulse 2.2s infinite;
  flex-shrink: 0;
}
@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 var(--accent-glow); }
  70%  { box-shadow: 0 0 0 10px transparent; }
  100% { box-shadow: 0 0 0 0 transparent; }
}

.hero-mark {
  display: flex;
  align-items: baseline;
  gap: clamp(12px, 2.4vw, 32px);
  margin: 32px 0 18px;
  flex-wrap: wrap;
}
.hero-mark-primary {
  font-family: var(--serif);
  font-size: clamp(72px, 18vw, 220px);
  font-weight: 300;
  line-height: 0.9;
  letter-spacing: -0.02em;
  color: var(--fg);
}
[data-lang="cn"] .hero-mark-primary { letter-spacing: 0.02em; }
.hero-mark-sub {
  font-family: var(--mono);
  font-size: clamp(13px, 1.6vw, 18px);
  color: var(--fg-dim);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  padding-bottom: clamp(12px, 2vw, 24px);
}

.hero-pillars {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(8px, 1.4vw, 18px);
  margin: 24px 0 32px;
  font-family: var(--serif);
  font-size: clamp(18px, 2.4vw, 30px);
  font-style: italic;
  color: var(--accent);
}
.hero-pillars span { display: inline-flex; align-items: center; }
.hero-pillars .sep {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent);
  opacity: 0.5;
  margin: 0 4px 4px;
  align-self: end;
}

.hero-tagline {
  font-family: var(--serif);
  font-size: clamp(20px, 2.6vw, 36px);
  line-height: 1.3;
  color: var(--fg);
  max-width: 880px;
  text-wrap: balance;
  letter-spacing: -0.005em;
}
.hero-tagline span { display: block; }
.hero-tagline span:last-child { color: var(--fg-mute); }

.hero-hook {
  margin-top: 28px;
  font-family: var(--mono);
  font-size: clamp(12px, 1.3vw, 13px);
  letter-spacing: 0.04em;
  color: var(--fg-dim);
  height: 22px;
  overflow: hidden;
}
.hero-hook .hook-text {
  display: inline-block;
  animation: hook-cycle 0.55s var(--t-med);
}
@keyframes hook-cycle {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.hero-cta {
  display: flex;
  gap: 14px;
  margin-top: 44px;
  flex-wrap: wrap;
  align-items: center;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 22px;
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  transition: all var(--t-med);
  border: 1px solid transparent;
}
.btn-primary {
  background: var(--accent);
  color: var(--bg);
  font-weight: 600;
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 24px var(--accent-glow);
}
.btn-secondary {
  background: transparent;
  color: var(--fg);
  border-color: var(--line-strong);
}
.btn-secondary:hover { border-color: var(--fg); }
.btn svg { width: 15px; height: 15px; flex-shrink: 0; }

.hero-trigger {
  margin-top: 48px;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 18px;
  border: 1px dashed var(--line-strong);
  border-radius: var(--r-md);
  background: color-mix(in srgb, var(--bg-elev) 60%, transparent);
  max-width: 720px;
  flex-wrap: wrap;
}
.hero-trigger-label {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--fg-mute);
  letter-spacing: 0.05em;
}
.hero-trigger-phrase {
  font-family: var(--serif);
  font-style: italic;
  font-size: clamp(18px, 2vw, 22px);
  color: var(--accent);
  display: inline-flex;
  align-items: center;
}
.hero-trigger-phrase::after {
  content: "▍";
  margin-left: 4px;
  animation: blink 1.05s steps(2) infinite;
  color: var(--accent);
}
@keyframes blink { 50% { opacity: 0; } }
.hero-trigger-hint {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--fg-dim);
  flex-basis: 100%;
  letter-spacing: 0.03em;
  line-height: 1.5;
}

.hero-stats {
  margin-top: 56px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.hero-stat {
  padding: 22px 18px;
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.hero-stat:last-child { border-right: 0; }
.hero-stat-k {
  font-family: var(--serif);
  font-size: clamp(28px, 3.4vw, 44px);
  color: var(--counter);
  line-height: 1;
  letter-spacing: -0.01em;
}
.hero-stat-v {
  font-family: var(--mono);
  font-size: clamp(10px, 1vw, 11px);
  color: var(--fg-mute);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* ─── Section: What ─────────────────────────────────────────────────────── */
.what-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(32px, 6vw, 96px);
  align-items: start;
  margin-top: 40px;
}
.what-lede {
  font-family: var(--serif);
  font-size: clamp(18px, 1.7vw, 24px);
  line-height: 1.55;
  color: var(--fg-mute);
  max-width: 540px;
  text-wrap: pretty;
}
.what-lede b { color: var(--fg); font-weight: 500; }

.what-pairs {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--line);
}
.what-pair {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 18px;
  align-items: center;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}
.what-pair .pain {
  font-size: 14px;
  color: var(--fg-dim);
  text-decoration: line-through;
  text-decoration-color: var(--fg-dim);
  text-wrap: pretty;
}
.what-pair .cure {
  font-size: 14px;
  color: var(--fg);
  text-wrap: pretty;
  font-weight: 500;
}
.what-pair .arrow {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 14px;
}

/* ─── Section: Pillars ──────────────────────────────────────────────────── */
.pillars-note {
  font-family: var(--serif);
  font-style: italic;
  font-size: clamp(16px, 1.6vw, 22px);
  line-height: 1.55;
  color: var(--fg-mute);
  max-width: 760px;
  margin-bottom: 56px;
  border-left: 2px solid var(--accent);
  padding-left: 22px;
  text-wrap: pretty;
}

.pillars-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}
.pillar {
  position: relative;
  padding: 32px 30px;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  transition: transform var(--t-med), border-color var(--t-med);
  isolation: isolate;
}
.pillar::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 100% 0%, var(--accent-soft), transparent 60%);
  opacity: 0;
  transition: opacity var(--t-slow);
  pointer-events: none;
  z-index: -1;
}
.pillar:hover {
  border-color: var(--line-strong);
  transform: translateY(-2px);
}
.pillar:hover::before { opacity: 1; }

.pillar-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 22px;
  gap: 20px;
}
.pillar-glyph {
  font-family: var(--serif);
  font-size: 64px;
  line-height: 1;
  color: var(--accent);
  font-weight: 300;
  flex-shrink: 0;
}
[data-lang="cn"] .pillar-glyph { font-size: 80px; }
.pillar-idx {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--fg-dim);
  padding-top: 6px;
}
.pillar-name {
  font-family: var(--serif);
  font-size: clamp(24px, 3vw, 32px);
  margin: 0 0 6px;
  color: var(--fg);
  letter-spacing: -0.005em;
  line-height: 1.1;
}
.pillar-oneline {
  font-family: var(--serif);
  font-style: italic;
  font-size: clamp(15px, 1.5vw, 17px);
  color: var(--accent);
  margin-bottom: 18px;
  line-height: 1.4;
}
.pillar-body {
  font-size: 14px;
  line-height: 1.65;
  color: var(--fg-mute);
  margin-bottom: 18px;
  text-wrap: pretty;
}
.pillar-shun {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.03em;
  color: var(--fg-dim);
  padding: 6px 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
}
.pillar-shun::before { content: "×"; color: var(--accent); font-weight: 700; }

/* ─── Section: Skills ───────────────────────────────────────────────────── */
.skills-note {
  font-family: var(--serif);
  font-style: italic;
  font-size: clamp(15px, 1.4vw, 19px);
  color: var(--fg-mute);
  margin-bottom: 56px;
  max-width: 760px;
  text-wrap: pretty;
  line-height: 1.5;
}
.skills-stack {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 22px;
}
.skill {
  position: relative;
  padding: 30px 28px 32px;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: border-color var(--t-med), transform var(--t-med);
}
.skill:hover { border-color: var(--line-strong); }
.skill.skill-base {
  background: linear-gradient(180deg, color-mix(in srgb, var(--accent-soft) 70%, var(--bg-elev)), var(--bg-elev));
  border-color: color-mix(in srgb, var(--accent) 30%, var(--line));
}
.skill-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.skill-idx {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--fg-dim);
}
.skill-kind {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
}
.skill-base .skill-kind {
  background: var(--accent);
  color: var(--bg);
}
.skill-name {
  font-family: var(--serif);
  font-size: clamp(24px, 2.8vw, 30px);
  line-height: 1.1;
  letter-spacing: -0.005em;
  color: var(--fg);
}
.skill-trigger {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--fg);
  padding: 8px 12px;
  background: color-mix(in srgb, var(--bg-elev-2) 80%, var(--bg));
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  letter-spacing: 0.02em;
  width: fit-content;
  max-width: 100%;
  word-break: break-word;
}
.skill-oneline {
  font-family: var(--serif);
  font-style: italic;
  font-size: 15.5px;
  line-height: 1.5;
  color: var(--fg-mute);
  text-wrap: pretty;
}
.skill-bullets {
  list-style: none;
  padding: 0;
  margin: 8px 0 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.skill-bullets li {
  display: flex;
  gap: 10px;
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--fg-mute);
}
.skill-bullets li::before {
  content: "—";
  color: var(--accent);
  flex-shrink: 0;
}

/* ─── Section: Compare ──────────────────────────────────────────────────── */
.compare-table {
  margin-top: 22px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--bg-elev);
}
.compare-head, .compare-row {
  display: grid;
  grid-template-columns: 200px 1fr 1fr;
}
.compare-head {
  background: var(--bg-elev-2);
  border-bottom: 1px solid var(--line);
}
.compare-head > div {
  padding: 18px 22px;
  border-right: 1px solid var(--line);
}
.compare-head > div:last-child { border-right: 0; }
.compare-head .col-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-dim);
}
.compare-head .col-name {
  font-family: var(--serif);
  font-size: 22px;
  color: var(--fg);
  margin-top: 4px;
}
.compare-head .col-sub {
  font-size: 12px;
  color: var(--fg-mute);
  margin-top: 2px;
}
.compare-head .col-b .col-name { color: var(--accent); }

.compare-row {
  border-bottom: 1px solid var(--line);
}
.compare-row:last-child { border-bottom: 0; }
.compare-row > div {
  padding: 22px;
  border-right: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.55;
  text-wrap: pretty;
}
.compare-row > div:last-child { border-right: 0; }
.compare-row .ctx {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--fg-dim);
  text-transform: uppercase;
  align-self: center;
}
.compare-row .a {
  color: var(--fg-mute);
  background: color-mix(in srgb, var(--bg-elev-2) 35%, transparent);
  font-family: var(--mono);
  font-size: 13px;
}
.compare-row .b {
  color: var(--fg);
  background: color-mix(in srgb, var(--accent-soft) 30%, transparent);
  position: relative;
}
.compare-row .b::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 2px;
  background: var(--accent);
}

/* ─── Section: Origin ───────────────────────────────────────────────────── */
.origin-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: clamp(32px, 6vw, 96px);
  align-items: start;
  margin-top: 56px;
}
.origin-quote {
  font-family: var(--serif);
  font-style: italic;
  font-size: clamp(24px, 3.4vw, 42px);
  line-height: 1.3;
  color: var(--fg);
  margin-bottom: 12px;
  text-wrap: pretty;
  letter-spacing: -0.005em;
  position: relative;
  padding-left: 30px;
}
.origin-quote::before {
  content: "“";
  position: absolute;
  left: -8px;
  top: -18px;
  font-size: 80px;
  color: var(--accent);
  line-height: 1;
}
.origin-attr {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--fg-dim);
  letter-spacing: 0.04em;
  margin-left: 30px;
  margin-bottom: 40px;
}
.origin-body {
  display: flex;
  flex-direction: column;
  gap: 18px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--fg-mute);
  max-width: 620px;
  margin-left: 30px;
  text-wrap: pretty;
}

.timeline {
  position: relative;
  padding-left: 32px;
  border-left: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 28px;
}
.tl-item { position: relative; }
.tl-item::before {
  content: "";
  position: absolute;
  left: -38px;
  top: 6px;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
}
.tl-date {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--accent);
  text-transform: uppercase;
}
.tl-title {
  font-family: var(--serif);
  font-size: 19px;
  color: var(--fg);
  margin: 4px 0 6px;
  letter-spacing: -0.005em;
  line-height: 1.3;
}
.tl-body {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--fg-mute);
  text-wrap: pretty;
}

.credits {
  margin-top: 64px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.credit {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--bg-elev);
}
.credit-name {
  font-family: var(--serif);
  font-size: 22px;
  color: var(--accent);
  margin-bottom: 6px;
}
.credit-role {
  font-size: 13px;
  line-height: 1.5;
  color: var(--fg-mute);
}

/* ─── Section: Install ──────────────────────────────────────────────────── */
.install-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  margin-top: 32px;
}
.install-card {
  padding: 28px;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
}
.install-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-dim);
  margin-bottom: 12px;
}
.install-title {
  font-family: var(--serif);
  font-size: clamp(20px, 2vw, 22px);
  color: var(--fg);
  margin-bottom: 16px;
  line-height: 1.3;
}

.terminal {
  background: var(--terminal-bg);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--r-md);
  padding: 20px;
  padding-right: 80px;  /* leave room for the copy button */
  font-family: var(--mono);
  font-size: 13px;
  color: var(--terminal-fg);
  position: relative;
  overflow: hidden;
  word-break: break-all;
}
[data-theme="light"] .terminal { border-color: rgba(0,0,0,0.08); }
.terminal-line {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 4px 0;
}
.terminal-line .prompt { color: #ff7849; flex-shrink: 0; }
.terminal-line .cmd { color: var(--terminal-fg); }
.terminal-copy {
  position: absolute;
  top: 14px; right: 14px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 5px 10px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 6px;
  color: rgba(255, 255, 255, 0.7);
  cursor: pointer;
  transition: all var(--t-med);
}
[data-theme="light"] .terminal-copy {
  border-color: rgba(255,255,255,0.3);
  color: rgba(255,255,255,0.8);
}
.terminal-copy:hover { color: #ff7849; border-color: #ff7849; }
.terminal-copy.copied { color: #82dbe9; border-color: #82dbe9; }

.phrases {
  margin-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.phrase-row {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 16px;
  background: color-mix(in srgb, var(--bg-elev-2) 60%, transparent);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  flex-wrap: wrap;
}
.phrase-row .ph {
  font-family: var(--serif);
  font-style: italic;
  font-size: 16px;
  color: var(--accent);
  flex: 1;
}
.phrase-row .tag {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg-dim);
}

/* Matrix bars */
.matrix-card { padding: 0; overflow: hidden; }
.matrix-head { padding: 22px 28px 12px; }
.matrix-rows {
  padding: 0 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.matrix-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.matrix-item .m-top {
  display: grid;
  grid-template-columns: minmax(120px, 1fr) 2fr auto;
  gap: 14px;
  align-items: center;
  font-size: 13px;
}
.matrix-item .m-tool {
  font-family: var(--serif);
  font-size: 16px;
  color: var(--fg);
}
.matrix-item .m-bar {
  height: 6px;
  border-radius: 999px;
  background: var(--line);
  position: relative;
  overflow: hidden;
}
.matrix-item .m-fill {
  position: absolute;
  inset: 0 auto 0 0;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent-2), var(--accent));
  transition: width 800ms cubic-bezier(.2,.7,.2,1);
}
.matrix-item .m-pct {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--fg-mute);
  text-align: right;
  min-width: 40px;
}
.matrix-item .m-note {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--fg-dim);
  letter-spacing: 0.02em;
  padding-left: 14px;
  position: relative;
}
.matrix-item .m-note::before {
  content: "└";
  position: absolute;
  left: 0;
}

.final-cta {
  margin-top: 80px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  text-align: center;
}
.final-cta-mark {
  font-family: var(--serif);
  font-size: clamp(40px, 7vw, 84px);
  font-style: italic;
  color: var(--accent);
  letter-spacing: -0.01em;
  line-height: 1.1;
  text-wrap: balance;
}
.final-cta-tag {
  font-family: var(--serif);
  font-size: clamp(15px, 1.6vw, 18px);
  color: var(--fg-mute);
  max-width: 560px;
  text-wrap: balance;
  line-height: 1.5;
}
.final-cta-buttons {
  display: flex;
  gap: 12px;
  margin-top: 12px;
  flex-wrap: wrap;
  justify-content: center;
}
.foot {
  margin-top: 80px;
  padding-top: 32px;
  border-top: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--fg-dim);
  letter-spacing: 0.03em;
  text-align: center;
  line-height: 1.6;
}

/* ─── Cursor glow (desktop only) ────────────────────────────────────────── */
.cursor-glow {
  position: fixed;
  pointer-events: none;
  width: 320px; height: 320px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--accent-glow), transparent 65%);
  z-index: 1;
  mix-blend-mode: screen;
  transform: translate(-50%, -50%);
  opacity: 0;
  transition: opacity 700ms ease;
}
[data-theme="light"] .cursor-glow { mix-blend-mode: multiply; }
.cursor-glow.active { opacity: 0.45; }
[data-theme="light"] .cursor-glow.active { opacity: 0.18; }

/* ─── Scroll-reveal ─────────────────────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 700ms cubic-bezier(.2,.7,.2,1), transform 700ms cubic-bezier(.2,.7,.2,1);
}
.reveal.in {
  opacity: 1;
  transform: none;
}

/* ─── Tablet breakpoint (≤920px) ────────────────────────────────────────── */
@media (max-width: 920px) {
  .nav-links { display: none; }
  .nav-brand .brand-sub { display: none; }

  .what-grid { grid-template-columns: 1fr; }
  .skills-stack { grid-template-columns: 1fr; gap: 18px; }
  .install-block { grid-template-columns: 1fr; gap: 18px; }
  .origin-grid { grid-template-columns: 1fr; }
}

/* ≤640: compact nav toggles + GitHub cta becomes icon-only to fit */
@media (max-width: 640px) {
  .nav-right { gap: 8px; }
  .nav-settings { gap: 4px; }
  .nav-toggle button { min-width: 22px; padding: 0 6px; font-size: 10px; }
  .nav-cta { padding: 7px 10px; gap: 0; font-size: 0; }
  .nav-cta svg { width: 16px; height: 16px; }
}

/* ─── Phone breakpoint (≤760px) ─────────────────────────────────────────── */
@media (max-width: 760px) {
  .pillars-grid { grid-template-columns: 1fr; }
  .credits { grid-template-columns: 1fr; }

  /* What pairs: stack pain → cure */
  .what-pair { grid-template-columns: 1fr; gap: 8px; padding: 16px 0; }
  .what-pair .arrow { display: none; }
  .what-pair .pain {
    font-size: 13px;
    position: relative;
    padding-left: 22px;
  }
  .what-pair .pain::before {
    content: "✕";
    position: absolute;
    left: 0;
    top: 0;
    color: var(--fg-dim);
    font-family: var(--mono);
    font-size: 11px;
  }
  .what-pair .cure {
    font-size: 14px;
    position: relative;
    padding-left: 22px;
  }
  .what-pair .cure::before {
    content: "→";
    position: absolute;
    left: 0;
    top: 0;
    color: var(--accent);
    font-family: var(--mono);
    font-weight: 700;
  }
}

/* ─── Small phone breakpoint (≤640px) ───────────────────────────────────── */
@media (max-width: 640px) {
  /* Hero */
  .hero { padding: clamp(32px, 8vh, 80px) 0 clamp(60px, 14vh, 120px); }
  .hero-mark { margin: 24px 0 14px; gap: 12px; }
  .hero-mark-sub { padding-bottom: 8px; }
  .hero-pillars { margin: 18px 0 26px; }
  .hero-cta { margin-top: 32px; gap: 10px; }
  .hero-cta .btn { padding: 12px 18px; font-size: 12.5px; }
  .hero-trigger { margin-top: 36px; padding: 14px 16px; gap: 10px; }
  .hero-trigger-label { font-size: 11px; }
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    margin-top: 44px;
  }
  .hero-stat:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .hero-stat:nth-child(2n) { border-right: 0; }
  .hero-stat { padding: 18px 16px; }

  /* Sections common */
  .section { padding: 60px 0; }
  .section-headline { margin-bottom: 18px; }
  .pillars-note { padding-left: 18px; margin-bottom: 40px; }
  .skills-note { margin-bottom: 36px; }
  .pillar { padding: 26px 22px; }
  .pillar-head { margin-bottom: 18px; gap: 14px; }
  .pillar-glyph { font-size: 52px; }
  [data-lang="cn"] .pillar-glyph { font-size: 64px; }
  .skill { padding: 26px 22px; }
  .install-card { padding: 22px; }
  .terminal { padding: 16px; padding-right: 72px; font-size: 12.5px; }
  .terminal-copy { top: 12px; right: 12px; }

  /* Compare table — cards on mobile */
  .compare-head { display: none; }
  .compare-table {
    border: 0;
    background: transparent;
    border-radius: 0;
    overflow: visible;
    margin-top: 8px;
  }
  .compare-row {
    grid-template-columns: 1fr;
    margin-bottom: 16px;
    border: 1px solid var(--line);
    border-radius: var(--r-md);
    overflow: hidden;
    background: var(--bg-elev);
  }
  .compare-row > div {
    padding: 14px 16px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
  .compare-row > div:last-child { border-bottom: 0; }
  .compare-row .ctx {
    background: var(--bg-elev-2);
    padding: 10px 16px;
    text-align: left;
  }
  .compare-row .a,
  .compare-row .b {
    font-size: 13.5px;
    line-height: 1.55;
  }
  .compare-row .a::before,
  .compare-row .b::before {
    content: attr(data-label);
    display: block;
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--fg-dim);
    margin-bottom: 6px;
  }
  .compare-row .b {
    background: color-mix(in srgb, var(--accent-soft) 45%, transparent);
  }
  .compare-row .b::before { color: var(--accent); }
  .compare-row .b::after {
    /* keep accent rail visible */
    content: "";
    position: absolute;
    left: 0; top: 0; bottom: 0;
    width: 2px;
    background: var(--accent);
  }
  .compare-row .b { position: relative; }

  /* Origin: tighter */
  .origin-grid { margin-top: 40px; gap: 36px; }
  .origin-quote { padding-left: 22px; }
  .origin-quote::before { font-size: 56px; left: -4px; top: -14px; }
  .origin-attr { margin-left: 22px; margin-bottom: 28px; }
  .origin-body { margin-left: 22px; gap: 14px; }
  .credits { margin-top: 44px; }
  .credit { padding: 18px; }

  /* Install / phrases */
  .phrase-row { padding: 10px 14px; }
  .phrase-row .ph { font-size: 15px; min-width: 0; }
  .phrase-row .tag { font-size: 10px; }
  .matrix-rows { padding: 0 22px 22px; }
  .matrix-item .m-top { grid-template-columns: 1fr auto; }
  .matrix-item .m-bar { grid-column: 1 / -1; order: 3; }
  .matrix-item .m-pct { order: 2; }

  .final-cta { margin-top: 56px; }
  .foot { margin-top: 56px; }
}

/* ─── Reduced-motion: honor user preference ─────────────────────────────── */
@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;
  }
  .reveal { opacity: 1 !important; transform: none !important; }
  .pillar:hover { transform: none; }
  .hero-eyebrow .pulse { animation: none; }
  .hero-trigger-phrase::after { animation: none; }
  .cursor-glow { display: none; }
}