/* ═══════════════════════════════════════════════════
   T3 BRAND PLAYBOOK — Design System
   TECOTEC Technology · v1.0 · Tháng 4/2026
   ═══════════════════════════════════════════════════ */

/* ── Tokens ─────────────────────────────────────── */
:root {
  --color-orange: #FF9900;
  --color-orange-light: #FFF3E0;
  --color-blue: #146EB4;
  --color-blue-light: #E3F2FD;
  --color-blue-dark: #0D4F82;
  --color-text: #3B3B3B;
  --color-text-muted: #6B6B6B;
  --color-green: #61CE70;
  --color-red: #F5222D;
  --color-white: #FCFCFC;
  --color-black: #1D1D1D;
  --color-grey-1: #F5F5F5;
  --color-grey-2: #E8E8E8;
  --color-grey-3: #D0D0D0;

  --font-sans: 'IBM Plex Sans', Arial, sans-serif;
  --font-mono: 'IBM Plex Mono', 'Courier New', monospace;

  --text-h1: clamp(2.2rem, 4vw, 3.815rem);
  --text-h2: clamp(1.6rem, 2.8vw, 3.052rem);
  --text-h3: clamp(1.3rem, 2.2vw, 2.441rem);
  --text-h4: clamp(1.1rem, 1.8vw, 1.953rem);
  --text-h5: 1.563rem;
  --text-h6: 1.25rem;
  --text-body: 1rem;
  --text-small: 0.8rem;
  --text-extra: 0.64rem;

  --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);

  --space-2xs: 2px;
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 40px;
  --space-2xl: 64px;
  --space-3xl: 96px;

  --sidebar-w: 280px;
  --header-h: 56px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
}

/* ── Reset ──────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + var(--space-lg));
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-body);
  font-weight: 400;
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-blue); text-decoration: none; transition: color 200ms var(--ease-out-quart); }
a:hover { color: var(--color-blue-dark); }
a:focus-visible { outline: 2px solid var(--color-blue); outline-offset: 2px; border-radius: var(--radius-sm); }

h1, h2, h3, h4, h5, h6 { font-weight: 700; line-height: 1.2; color: var(--color-black); }
h1 { font-size: var(--text-h1); }
h2 { font-size: var(--text-h2); }
h3 { font-size: var(--text-h3); }
h4 { font-size: var(--text-h4); }
h5 { font-size: var(--text-h5); }
h6 { font-size: var(--text-h6); }

/* ── Progress Bar ───────────────────────────────── */
#progress-bar {
  position: fixed; top: 0; left: 0; right: 0;
  height: 3px; background: var(--color-orange);
  transform-origin: left; transform: scaleX(0);
  z-index: 1000;
}
@supports (animation-timeline: scroll()) {
  #progress-bar {
    animation: progress-grow linear both;
    animation-timeline: scroll();
  }
  @keyframes progress-grow { to { transform: scaleX(1); } }
}

/* ── Header ─────────────────────────────────────── */
.header {
  position: fixed; top: 3px; left: 0; right: 0;
  height: var(--header-h);
  background: rgba(252,252,252,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-grey-2);
  display: flex; align-items: center;
  padding: 0 var(--space-lg);
  z-index: 900;
}
.header__logo { height: 28px; width: auto; margin-right: var(--space-md); }
.header__title { font-size: var(--text-h6); font-weight: 600; color: var(--color-black); }
.header__version {
  font-size: var(--text-extra); font-weight: 500;
  background: var(--color-grey-1); color: var(--color-text-muted);
  padding: 2px 8px; border-radius: 99px; margin-left: var(--space-sm);
}
.header__hamburger {
  display: none; background: none; border: none; cursor: pointer;
  width: 44px; height: 44px; align-items: center; justify-content: center;
  margin-left: auto;
}
.header__hamburger svg { width: 24px; height: 24px; stroke: var(--color-text); }

/* ── Layout ─────────────────────────────────────── */
.layout { display: flex; min-height: 100vh; padding-top: calc(var(--header-h) + 3px); }

/* ── Sidebar ────────────────────────────────────── */
.sidebar {
  position: fixed; top: calc(var(--header-h) + 3px); bottom: 0;
  width: var(--sidebar-w); overflow-y: auto;
  padding: var(--space-lg) 0;
  border-right: 1px solid var(--color-grey-2);
  background: var(--color-white);
  z-index: 800;
}
.sidebar__nav { list-style: none; }
.sidebar__section-label {
  font-size: var(--text-extra); font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--color-text-muted);
  padding: var(--space-lg) var(--space-lg) var(--space-xs);
}
.nav-link {
  display: flex; align-items: center;
  padding: var(--space-sm) var(--space-lg);
  font-size: 0.875rem; font-weight: 500;
  color: var(--color-text-muted);
  border-left: 3px solid transparent;
  transition: all 200ms var(--ease-out-quart);
  text-decoration: none;
}
.nav-link:hover { color: var(--color-text); background: var(--color-grey-1); }
.nav-link.is-active {
  color: var(--color-blue); font-weight: 600;
  border-left-color: var(--color-orange);
  background: var(--color-blue-light);
}
.nav-link--sub { padding-left: calc(var(--space-lg) + var(--space-md)); font-size: 0.813rem; }
.nav-link__num {
  font-size: var(--text-extra); font-family: var(--font-mono);
  color: var(--color-grey-3); margin-right: var(--space-sm); min-width: 22px;
}

.sidebar-backdrop {
  display: none; position: fixed; inset: 0;
  background: rgba(29,29,29,0.5);
  backdrop-filter: blur(4px); z-index: 799;
}

/* ── Content ────────────────────────────────────── */
.content { flex: 1; margin-left: var(--sidebar-w); min-width: 0; }
.content__inner { max-width: 860px; margin: 0 auto; padding: var(--space-2xl) var(--space-xl); }

/* ── Sections ───────────────────────────────────── */
.section { padding-bottom: var(--space-3xl); }
.section + .section { border-top: 1px solid var(--color-grey-2); padding-top: var(--space-2xl); }
.section__number {
  font-family: var(--font-mono); font-size: var(--text-small);
  color: var(--color-orange); font-weight: 600;
  margin-bottom: var(--space-xs);
}
.section__title { margin-bottom: var(--space-sm); }
.section__subtitle {
  font-size: 1.125rem; color: var(--color-text-muted);
  font-weight: 400; margin-bottom: var(--space-xl);
  max-width: 65ch;
}
.section__body p { max-width: 65ch; margin-bottom: var(--space-md); }
.section__body h3 { margin-top: var(--space-xl); margin-bottom: var(--space-md); }
.section__body h4 { margin-top: var(--space-lg); margin-bottom: var(--space-sm); }

/* ── Hero ───────────────────────────────────────── */
.hero {
  min-height: 92vh;
  background: #0D1117;
  color: var(--color-white);
  padding: var(--space-3xl) var(--space-xl) var(--space-2xl);
  text-align: center;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Deep layered gradient */
.hero::before {
  content: '';
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 20% 0%, rgba(20,110,180,0.28) 0%, transparent 65%),
    radial-gradient(ellipse 60% 50% at 80% 100%, rgba(255,153,0,0.18) 0%, transparent 60%),
    radial-gradient(ellipse 50% 40% at 50% 50%, rgba(20,110,180,0.08) 0%, transparent 70%);
  pointer-events: none;
}

/* Fine grid overlay */
.hero::after {
  content: '';
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 20%, transparent 100%);
  pointer-events: none;
}

.hero__content {
  position: relative; z-index: 1;
  max-width: 820px; margin: 0 auto;
  display: flex; flex-direction: column; align-items: center;
}

/* Eyebrow label */
.hero__eyebrow {
  display: inline-flex; align-items: center; gap: var(--space-sm);
  font-family: var(--font-mono); font-size: var(--text-extra);
  font-weight: 600; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--color-orange);
  background: rgba(255,153,0,0.1);
  border: 1px solid rgba(255,153,0,0.25);
  padding: 6px 16px; border-radius: 99px;
  margin-bottom: var(--space-xl);
}
.hero__eyebrow::before {
  content: '';
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--color-orange);
  box-shadow: 0 0 8px var(--color-orange);
  animation: pulse-dot 2s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.7); }
}

.hero__logo {
  height: 56px; margin: 0 auto var(--space-xl);
  filter: drop-shadow(0 0 24px rgba(255,153,0,0.3));
}

.hero__wordmark {
  font-size: clamp(2.8rem, 7vw, 5.5rem);
  font-weight: 700; line-height: 1.05;
  letter-spacing: -0.02em;
  color: #fff;
  margin-bottom: var(--space-sm);
}

/* Orange underline accent on "Technology" */
.hero__wordmark em {
  font-style: normal;
  background: linear-gradient(90deg, var(--color-orange), #FFB84D);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__tagline {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: rgba(252,252,252,0.55);
  font-weight: 400;
  font-style: italic;
  margin-bottom: var(--space-2xl);
  max-width: 52ch;
  letter-spacing: 0.01em;
}

/* Orange divider line */
.hero__divider {
  width: 60px; height: 3px;
  background: linear-gradient(90deg, var(--color-orange), rgba(255,153,0,0));
  border-radius: 99px;
  margin: 0 auto var(--space-xl);
}

.hero__badges { display: flex; gap: var(--space-sm); justify-content: center; flex-wrap: wrap; }

/* Stat strip */
.hero__stats {
  display: flex; gap: var(--space-xl);
  margin-top: var(--space-2xl);
  padding-top: var(--space-xl);
  border-top: 1px solid rgba(255,255,255,0.08);
  flex-wrap: wrap; justify-content: center;
}
.hero__stat { text-align: center; }
.hero__stat-value {
  font-size: 1.75rem; font-weight: 700;
  color: #fff; line-height: 1;
  margin-bottom: 4px;
}
.hero__stat-value span { color: var(--color-orange); }
.hero__stat-label {
  font-size: var(--text-extra); color: rgba(252,252,252,0.4);
  text-transform: uppercase; letter-spacing: 0.08em; font-weight: 600;
}

/* Scroll cue */
.hero__scroll-cue {
  position: absolute; bottom: var(--space-xl); left: 50%; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: var(--space-xs);
  color: rgba(252,252,252,0.25); font-size: var(--text-extra);
  letter-spacing: 0.1em; text-transform: uppercase; font-weight: 600;
  animation: scroll-cue-bob 2.5s ease-in-out infinite;
}
.hero__scroll-cue svg { width: 20px; height: 20px; stroke: currentColor; }
@keyframes scroll-cue-bob {
  0%, 100% { transform: translateX(-50%) translateY(0); opacity: 0.25; }
  50% { transform: translateX(-50%) translateY(6px); opacity: 0.5; }
}

/* ── Badges ─────────────────────────────────────── */
.badge {
  display: inline-flex; align-items: center;
  padding: 4px 12px; border-radius: 99px;
  font-size: var(--text-extra); font-weight: 600;
  letter-spacing: 0.02em;
}
.badge--orange { background: rgba(255,153,0,0.15); color: var(--color-orange); }
.badge--blue { background: rgba(20,110,180,0.15); color: #5BA3D9; }
.badge--neutral { background: rgba(252,252,252,0.1); color: rgba(252,252,252,0.5); }
.badge--format {
  background: var(--color-grey-1); color: var(--color-text-muted);
  font-family: var(--font-mono); text-transform: uppercase;
  font-size: 0.625rem; padding: 2px 8px;
}

/* ── Buttons ────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: var(--space-sm);
  padding: 10px 20px; border-radius: var(--radius-sm);
  font-family: var(--font-sans); font-size: 0.875rem; font-weight: 600;
  border: none; cursor: pointer; text-decoration: none;
  transition: all 150ms var(--ease-out-quart);
}
.btn:focus-visible { outline: 2px solid var(--color-blue); outline-offset: 2px; }
.btn:active { transform: scale(0.97); }

.btn--primary { background: var(--color-blue); color: #fff; }
.btn--primary:hover { background: var(--color-blue-dark); color: #fff; }

.btn--download { background: var(--color-blue); color: #fff; }
.btn--download:hover { background: var(--color-blue-dark); color: #fff; }

.btn--outlined {
  background: transparent; color: var(--color-blue);
  border: 1.5px solid var(--color-blue);
}
.btn--outlined:hover { background: var(--color-blue-light); }

.btn--ghost { background: transparent; color: var(--color-text-muted); }
.btn--ghost:hover { background: var(--color-grey-1); color: var(--color-text); }

.btn--sm { padding: 6px 14px; font-size: var(--text-small); }

.btn__icon { width: 16px; height: 16px; flex-shrink: 0; }

/* ── Data Tables ────────────────────────────────── */
.data-table { width: 100%; border-collapse: collapse; margin: var(--space-lg) 0; font-size: 0.9rem; }
.data-table th {
  text-align: left; font-weight: 600; font-size: var(--text-small);
  color: var(--color-text-muted); text-transform: uppercase; letter-spacing: 0.04em;
  padding: var(--space-sm) var(--space-md);
  border-bottom: 2px solid var(--color-grey-2);
}
.data-table td {
  padding: var(--space-sm) var(--space-md);
  border-bottom: 1px solid var(--color-grey-2);
  vertical-align: top;
}
.data-table tr:nth-child(even) td { background: var(--color-grey-1); }
.data-table code {
  font-family: var(--font-mono); font-size: 0.85em;
  background: var(--color-grey-1); padding: 2px 6px; border-radius: 3px;
}
.table-responsive { overflow-x: auto; -webkit-overflow-scrolling: touch; }

/* ── Guideline Table (Nên / Không nên) ──────────── */
.guideline-table { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-lg); margin: var(--space-lg) 0; }
.guideline-col { padding: var(--space-lg); border-radius: var(--radius-md); }
.guideline-col--do { background: rgba(97,206,112,0.08); border-left: 4px solid var(--color-green); }
.guideline-col--dont { background: rgba(245,34,45,0.06); border-left: 4px solid var(--color-red); }
.guideline-col__title { font-size: var(--text-h6); font-weight: 700; margin-bottom: var(--space-md); display: flex; align-items: center; gap: var(--space-sm); }
.guideline-col__title--do { color: #2E8B3C; }
.guideline-col__title--dont { color: var(--color-red); }
.guideline-col ul { list-style: none; }
.guideline-col li { padding: var(--space-xs) 0; padding-left: var(--space-lg); position: relative; font-size: 0.9rem; }
.guideline-col--do li::before { content: '✓'; position: absolute; left: 0; color: var(--color-green); font-weight: 700; }
.guideline-col--dont li::before { content: '✗'; position: absolute; left: 0; color: var(--color-red); font-weight: 700; }

/* ── Color Swatches ─────────────────────────────── */
.swatch-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: var(--space-md); margin: var(--space-lg) 0; }
.swatch-card {
  border-radius: var(--radius-md); overflow: hidden;
  border: 1px solid var(--color-grey-2);
  cursor: pointer; position: relative;
  transition: transform 150ms var(--ease-out-quart), box-shadow 150ms var(--ease-out-quart);
}
.swatch-card:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(29,29,29,0.1); }
.swatch-card:active { transform: scale(0.98); }
.swatch-card__color { height: 80px; width: 100%; }
.swatch-card__info { padding: var(--space-md); }
.swatch-card__name { font-weight: 600; font-size: 0.875rem; margin-bottom: var(--space-2xs); }
.swatch-card__hex { font-family: var(--font-mono); font-size: var(--text-small); color: var(--color-text-muted); }
.swatch-card__rgb { font-size: var(--text-extra); color: var(--color-text-muted); margin-top: 2px; }
.swatch-card__use { font-size: var(--text-extra); color: var(--color-text-muted); margin-top: var(--space-xs); }
.swatch-card__tooltip {
  position: absolute; top: var(--space-sm); right: var(--space-sm);
  background: var(--color-black); color: #fff;
  font-size: var(--text-extra); font-weight: 600;
  padding: 4px 10px; border-radius: 99px;
  opacity: 0; transform: translateY(4px);
  transition: opacity 150ms, transform 150ms;
  pointer-events: none;
}
.swatch-card__tooltip.is-visible { opacity: 1; transform: translateY(0); }
.swatch-ratio { display: flex; gap: var(--space-sm); align-items: center; margin: var(--space-md) 0; flex-wrap: wrap; }
.swatch-ratio__label { font-size: var(--text-small); font-weight: 600; color: var(--color-text-muted); padding: 4px 12px; border-radius: 99px; border: 1px solid var(--color-grey-2); }

/* ── Logo Cards ─────────────────────────────────── */
.logo-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: var(--space-lg); margin: var(--space-lg) 0; }
.logo-card {
  border: 1px solid var(--color-grey-2); border-radius: var(--radius-md);
  overflow: hidden; display: flex; flex-direction: column;
}
.logo-card__preview {
  height: 140px; display: flex; align-items: center; justify-content: center;
  padding: var(--space-lg);
}
.logo-card__preview--light { background: var(--color-white); border-bottom: 1px solid var(--color-grey-2); }
.logo-card__preview--dark { background: var(--color-black); border-bottom: 1px solid var(--color-grey-2); }
.logo-card__preview--file {
  background: var(--color-grey-1); border-bottom: 1px solid var(--color-grey-2);
  flex-direction: column; gap: var(--space-xs);
}
.logo-card__preview img { max-height: 80px; max-width: 100%; object-fit: contain; }
.logo-card__file-icon { font-size: 2rem; opacity: 0.4; }
.logo-card__file-ext { font-family: var(--font-mono); font-size: var(--text-small); color: var(--color-text-muted); font-weight: 600; text-transform: uppercase; }
.logo-card__body { padding: var(--space-md); flex: 1; display: flex; flex-direction: column; }
.logo-card__name { font-weight: 600; font-size: 0.875rem; margin-bottom: var(--space-xs); }
.logo-card__meta { display: flex; gap: var(--space-sm); align-items: center; margin-bottom: var(--space-md); }
.logo-card__download { margin-top: auto; }

/* ── Typography Demo ────────────────────────────── */
.type-demo { margin: var(--space-lg) 0; }
.type-demo__row { display: flex; align-items: baseline; gap: var(--space-lg); padding: var(--space-md) 0; border-bottom: 1px solid var(--color-grey-2); }
.type-demo__label { font-family: var(--font-mono); font-size: var(--text-extra); color: var(--color-text-muted); min-width: 80px; flex-shrink: 0; }
.type-demo__sample { flex: 1; }
.type-demo__meta { font-size: var(--text-extra); color: var(--color-grey-3); margin-left: var(--space-md); white-space: nowrap; }

/* ── Content Filter Checklist ───────────────────── */
.filter-list { list-style: none; margin: var(--space-lg) 0; }
.filter-item { display: flex; align-items: flex-start; gap: var(--space-md); padding: var(--space-md); border: 1px solid var(--color-grey-2); border-radius: var(--radius-md); margin-bottom: var(--space-sm); transition: border-color 200ms, background 200ms; }
.filter-item:has(input:checked) { border-color: var(--color-green); background: rgba(97,206,112,0.05); }
.filter-item input[type="checkbox"] { width: 20px; height: 20px; margin-top: 2px; flex-shrink: 0; accent-color: var(--color-green); cursor: pointer; }
.filter-item__text { font-size: 0.9rem; }
.filter-item__text strong { font-weight: 600; display: block; margin-bottom: 2px; }
.filter-completion {
  display: flex; align-items: center; gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  background: rgba(97,206,112,0.1); border: 1px solid var(--color-green);
  border-radius: var(--radius-md); margin-top: var(--space-md);
  font-weight: 600; color: #2E8B3C;
  opacity: 0; transform: translateY(8px);
  transition: opacity 300ms var(--ease-out-quart), transform 300ms var(--ease-out-quart);
  pointer-events: none;
}
.filter-completion.is-visible { opacity: 1; transform: translateY(0); pointer-events: auto; }

/* ── Code Block ─────────────────────────────────── */
.code-block {
  font-family: var(--font-mono); font-size: 0.85rem; line-height: 1.6;
  background: var(--color-grey-1); padding: var(--space-lg);
  border-radius: var(--radius-md); border: 1px solid var(--color-grey-2);
  overflow-x: auto; margin: var(--space-md) 0;
  white-space: pre-wrap; word-break: break-word;
}

/* ── Icon Demo Grid ─────────────────────────────── */
.icon-demo { display: grid; grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); gap: var(--space-md); margin: var(--space-lg) 0; }
.icon-demo__item { display: flex; flex-direction: column; align-items: center; gap: var(--space-sm); padding: var(--space-lg); border: 1px solid var(--color-grey-2); border-radius: var(--radius-md); }
.icon-demo__item svg { width: 24px; height: 24px; stroke: var(--color-text); stroke-width: 1.5; fill: none; }
.icon-demo__label { font-size: var(--text-extra); color: var(--color-text-muted); text-align: center; }

/* ── Quick Reference (§15) ──────────────────────── */
.quick-ref {
  background: var(--color-black); color: var(--color-white);
  padding: var(--space-2xl); border-radius: var(--radius-lg);
  margin-top: var(--space-xl);
}
.quick-ref h2 { color: var(--color-white); }
.quick-ref h3 { color: var(--color-orange); font-size: var(--text-h6); margin-top: var(--space-xl); margin-bottom: var(--space-sm); }
.quick-ref p, .quick-ref li { color: rgba(252,252,252,0.75); }
.quick-ref a { color: var(--color-orange); }
.quick-ref blockquote { border-left: 3px solid var(--color-orange); padding-left: var(--space-md); font-style: italic; color: rgba(252,252,252,0.6); margin: var(--space-md) 0; }
.quick-ref .data-table th { color: rgba(252,252,252,0.5); border-bottom-color: rgba(252,252,252,0.15); }
.quick-ref .data-table td { color: rgba(252,252,252,0.75); border-bottom-color: rgba(252,252,252,0.08); }
.quick-ref .data-table tr:nth-child(even) td { background: rgba(252,252,252,0.03); }
.quick-ref .data-table code { background: rgba(252,252,252,0.1); color: var(--color-orange); }
.quick-ref .btn--print { background: rgba(252,252,252,0.1); color: var(--color-white); border: 1px solid rgba(252,252,252,0.2); }
.quick-ref .btn--print:hover { background: rgba(252,252,252,0.2); }

/* ── Value Pair ─────────────────────────────────── */
.value-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-lg); margin: var(--space-lg) 0; }
.value-card { padding: var(--space-lg); border-left: 3px solid var(--color-blue); background: var(--color-grey-1); border-radius: 0 var(--radius-md) var(--radius-md) 0; }
.value-card__title { font-size: var(--text-h6); font-weight: 700; margin-bottom: var(--space-xs); }
.value-card__en { font-size: var(--text-small); color: var(--color-text-muted); font-style: italic; margin-bottom: var(--space-sm); }
.value-card__desc { font-size: 0.9rem; max-width: 50ch; }

/* ── Timeline ───────────────────────────────────── */
.timeline { position: relative; padding-left: var(--space-xl); margin: var(--space-lg) 0; }
.timeline::before { content: ''; position: absolute; left: 11px; top: 4px; bottom: 4px; width: 2px; background: var(--color-grey-2); }
.timeline__item { position: relative; padding-bottom: var(--space-lg); }
.timeline__dot { position: absolute; left: calc(-1 * var(--space-xl) + 6px); top: 6px; width: 12px; height: 12px; border-radius: 50%; background: var(--color-blue); border: 2px solid var(--color-white); }
.timeline__year { font-family: var(--font-mono); font-size: var(--text-small); font-weight: 700; color: var(--color-blue); margin-bottom: var(--space-2xs); }
.timeline__text { font-size: 0.9rem; max-width: 55ch; }

/* ── Tone Matrix ────────────────────────────────── */
.tone-card { display: grid; grid-template-columns: auto 1fr; gap: 0; border: 1px solid var(--color-grey-2); border-radius: var(--radius-md); overflow: hidden; margin: var(--space-sm) 0; }
.tone-card__is { padding: var(--space-md); background: rgba(20,110,180,0.06); font-weight: 600; font-size: 0.875rem; display: flex; align-items: center; min-width: 140px; }
.tone-card__not { padding: var(--space-md); font-size: 0.875rem; color: var(--color-text-muted); border-left: 1px solid var(--color-grey-2); }

/* ── Scroll Reveal ──────────────────────────────── */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 600ms var(--ease-out-quart), transform 600ms var(--ease-out-quart); }
.reveal.is-visible { opacity: 1; transform: translateY(0); }
.reveal-stagger > .reveal:nth-child(1) { transition-delay: 0ms; }
.reveal-stagger > .reveal:nth-child(2) { transition-delay: 80ms; }
.reveal-stagger > .reveal:nth-child(3) { transition-delay: 160ms; }
.reveal-stagger > .reveal:nth-child(4) { transition-delay: 240ms; }
.reveal-stagger > .reveal:nth-child(5) { transition-delay: 320ms; }
.reveal-stagger > .reveal:nth-child(6) { transition-delay: 400ms; }

/* ── Hero animations ────────────────────────────── */
.hero .reveal:nth-child(1) { transition-delay: 100ms; }
.hero .reveal:nth-child(2) { transition-delay: 250ms; }
.hero .reveal:nth-child(3) { transition-delay: 400ms; }
.hero .reveal:nth-child(4) { transition-delay: 550ms; }

/* ── Responsive ─────────────────────────────────── */
@media (max-width: 1023px) {
  :root { --sidebar-w: 0px; }
  .sidebar {
    position: fixed; left: 0; width: 280px;
    transform: translateX(-100%);
    transition: transform 300ms var(--ease-out-expo);
    box-shadow: none; z-index: 900;
  }
  .sidebar.is-open { transform: translateX(0); box-shadow: 16px 0 48px rgba(29,29,29,0.15); }
  .sidebar-backdrop.is-visible { display: block; }
  .header__hamburger { display: flex; }
  .content { margin-left: 0; }
  .value-grid { grid-template-columns: 1fr; }
}

@media (max-width: 767px) {
  .content__inner { padding: var(--space-xl) var(--space-md); }
  .hero { padding: var(--space-2xl) var(--space-md); min-height: 80vh; }
  .hero__scroll-cue { display: none; }
  .hero__stats { gap: var(--space-lg); }
  .guideline-table { grid-template-columns: 1fr; }
  .swatch-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); }
  .logo-grid { grid-template-columns: 1fr; }
  .type-demo__row { flex-direction: column; gap: var(--space-xs); }
  .type-demo__meta { margin-left: 0; }
  .nav-link { min-height: 44px; }
  .tone-card { grid-template-columns: 1fr; }
  .tone-card__not { border-left: none; border-top: 1px solid var(--color-grey-2); }
}

/* ── Print ──────────────────────────────────────── */
@media print {
  .header, .sidebar, .sidebar-backdrop, #progress-bar, .hero { display: none !important; }
  .content { margin-left: 0 !important; }
  .content__inner { padding: 0; max-width: 100%; }
  .section { page-break-inside: avoid; }
  .quick-ref { color: var(--color-text) !important; background: var(--color-white) !important; border: 2px solid var(--color-black); }
  .quick-ref h2, .quick-ref h3 { color: var(--color-black) !important; }
  .quick-ref p, .quick-ref li, .quick-ref td { color: var(--color-text) !important; }
  a[href]::after { content: ' (' attr(href) ')'; font-size: 0.8em; color: var(--color-text-muted); }
}

/* ── Reduced Motion ─────────────────────────────── */
@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; transform: none; }
}