/* ==========================================================================
   48H Revenue Studio — design tokens + components
   Art direction: decisive editorial / Swiss. Off-white paper, charcoal ink,
   one electric orange accent. Hairline rules, tight display type, no gradients.
   ========================================================================== */

:root {
  /* Type scale (fluid) */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.8125rem);
  --text-sm: clamp(0.875rem, 0.82rem + 0.25vw, 0.9375rem);
  --text-base: clamp(1rem, 0.96rem + 0.2vw, 1.0625rem);
  --text-lg: clamp(1.125rem, 1rem + 0.6vw, 1.375rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.2vw, 2.125rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.25rem);
  --text-3xl: clamp(2.5rem, 1rem + 4.2vw, 4.75rem);

  /* Spacing (4px base) */
  --space-1: 0.25rem;  --space-2: 0.5rem;   --space-3: 0.75rem;
  --space-4: 1rem;     --space-5: 1.25rem;  --space-6: 1.5rem;
  --space-8: 2rem;     --space-10: 2.5rem;  --space-12: 3rem;
  --space-16: 4rem;    --space-20: 5rem;    --space-24: 6rem;
  --space-32: 8rem;

  --radius-sm: 2px;
  --radius-md: 3px;
  --transition-interactive: 160ms cubic-bezier(0.2, 0.6, 0.2, 1);

  --font-display: 'Switzer', 'Helvetica Neue', Arial, sans-serif;
  --font-body: 'Satoshi', 'Helvetica Neue', Arial, sans-serif;
  --font-mono: ui-monospace, 'SFMono-Regular', Menlo, monospace;

  --measure: 68ch;
  --gutter: clamp(var(--space-5), 5vw, var(--space-16));
  --maxw: 76rem;
}

:root, [data-theme='light'] {
  --color-bg: #f6f4ef;
  --color-surface: #fbfaf7;
  --color-surface-2: #efece5;
  --color-ink: #17171a;
  --color-text: #17171a;
  --color-text-muted: #57564f;
  --color-text-faint: #8d8b82;
  --color-text-inverse: #f8f7f3;
  --color-rule: color-mix(in oklch, #17171a 16%, transparent);
  --color-rule-strong: color-mix(in oklch, #17171a 42%, transparent);
  --color-primary: #e63c00;
  --color-primary-hover: #c33100;
  --color-primary-ink: #ffffff;
  --color-primary-wash: color-mix(in oklch, #e63c00 10%, transparent);
}

[data-theme='dark'] {
  --color-bg: #131313;
  --color-surface: #1a1a19;
  --color-surface-2: #212120;
  --color-ink: #f4f2ed;
  --color-text: #f1efe9;
  --color-text-muted: #a8a59c;
  --color-text-faint: #7c7a72;
  --color-text-inverse: #131313;
  --color-rule: color-mix(in oklch, #f1efe9 18%, transparent);
  --color-rule-strong: color-mix(in oklch, #f1efe9 45%, transparent);
  --color-primary: #ff5a1f;
  --color-primary-hover: #ff7a45;
  --color-primary-ink: #17110d;
  --color-primary-wash: color-mix(in oklch, #ff5a1f 14%, transparent);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) {
    --color-bg: #131313;
    --color-surface: #1a1a19;
    --color-surface-2: #212120;
    --color-ink: #f4f2ed;
    --color-text: #f1efe9;
    --color-text-muted: #a8a59c;
    --color-text-faint: #7c7a72;
    --color-text-inverse: #131313;
    --color-rule: color-mix(in oklch, #f1efe9 18%, transparent);
    --color-rule-strong: color-mix(in oklch, #f1efe9 45%, transparent);
    --color-primary: #ff5a1f;
    --color-primary-hover: #ff7a45;
    --color-primary-ink: #17110d;
    --color-primary-wash: color-mix(in oklch, #ff5a1f 14%, transparent);
  }
}

/* ---------- Layout primitives ---------- */
.shell { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--gutter); }
.narrow { max-width: 54rem; }

section { border-top: 1px solid var(--color-rule); }
section:first-of-type { border-top: 0; }

.band { padding-block: clamp(var(--space-12), 7vw, var(--space-24)); }
.band--tight { padding-block: clamp(var(--space-10), 4.5vw, var(--space-16)); }
.band--wide { padding-block: clamp(var(--space-16), 9vw, var(--space-32)); }

.label {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-faint);
}
.label--accent { color: var(--color-primary); }

.section-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-4);
  margin-bottom: clamp(var(--space-8), 4vw, var(--space-12));
}
@media (min-width: 60rem) {
  .section-head { grid-template-columns: 10rem minmax(0, 1fr); gap: var(--space-8); align-items: baseline; }
}
h2 { font-family: var(--font-display); font-size: var(--text-xl); font-weight: 600; letter-spacing: -0.02em; }
h3 { font-family: var(--font-body); font-size: var(--text-lg); font-weight: 700; letter-spacing: -0.01em; }
.lede { color: var(--color-text-muted); font-size: var(--text-base); max-width: var(--measure); }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in oklch, var(--color-bg) 92%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-rule);
}
.header-inner {
  display: flex; align-items: center; gap: var(--space-6);
  min-height: 4rem; justify-content: space-between;
}
.brand { display: inline-flex; align-items: center; gap: var(--space-3); color: var(--color-ink); text-decoration: none; }
.brand svg { color: var(--color-ink); }
.brand-word {
  font-family: var(--font-display); font-weight: 600; font-size: 1.0625rem;
  letter-spacing: -0.02em; line-height: 1.05;
}
.brand-word span { display: block; font-family: var(--font-body); font-size: 0.6875rem; font-weight: 500; letter-spacing: 0.16em; text-transform: uppercase; color: var(--color-text-faint); }

.site-nav { display: none; gap: var(--space-6); }
@media (min-width: 64rem) { .site-nav { display: flex; } }
.site-nav a {
  font-size: var(--text-sm); color: var(--color-text-muted); text-decoration: none;
  padding-block: var(--space-2);
}
.site-nav a:hover { color: var(--color-primary); }

.header-tools { display: flex; align-items: center; gap: var(--space-2); }
.toolbtn {
  min-height: 44px; display: inline-flex; align-items: center; gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-rule); border-radius: var(--radius-sm);
  font-size: var(--text-xs); font-weight: 500; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--color-text-muted); background: transparent;
}
.toolbtn:hover { border-color: var(--color-rule-strong); color: var(--color-ink); }
.toolbtn[aria-pressed='true'] { color: var(--color-ink); border-color: var(--color-rule-strong); }
@media (max-width: 47.99rem) { .site-header .header-cta { display: none; } }
@media (max-width: 30rem) { .site-header .site-nav { display: none; } .brand-word { white-space: nowrap; } }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--space-3);
  min-height: 48px; padding: var(--space-3) var(--space-6);
  font-size: var(--text-sm); font-weight: 700; letter-spacing: 0.01em;
  text-decoration: none; border-radius: var(--radius-sm); border: 1px solid transparent;
}
.btn--primary { background: var(--color-primary); color: var(--color-primary-ink); }
.btn--primary:hover { background: var(--color-primary-hover); }
.btn--ghost { border-color: var(--color-rule-strong); color: var(--color-ink); }
.btn--ghost:hover { border-color: var(--color-primary); color: var(--color-primary); }
.btn--sm { min-height: 40px; padding: var(--space-2) var(--space-4); font-size: var(--text-xs); }
.btn .arrow { font-family: var(--font-mono); font-weight: 400; }

/* ---------- Hero ---------- */
.hero { padding-block: clamp(var(--space-12), 8vw, var(--space-32)) clamp(var(--space-10), 6vw, var(--space-20)); }
.hero-grid { display: grid; gap: clamp(var(--space-8), 5vw, var(--space-16)); }
@media (min-width: 62rem) { .hero-grid { grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr); align-items: start; } }

.hero-kicker { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-3); margin-bottom: var(--space-6); }
.slot-pill {
  display: inline-flex; align-items: center; gap: var(--space-2);
  border: 1px solid var(--color-primary); color: var(--color-primary);
  background: var(--color-primary-wash);
  padding: var(--space-1) var(--space-3); border-radius: 999px;
  font-size: var(--text-xs); font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase;
}
.dot { width: 6px; height: 6px; border-radius: 50%; background: var(--color-primary); }

h1 {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 600;
  letter-spacing: -0.035em;
  max-width: 22ch;
}
h1 em { font-style: normal; color: var(--color-primary); }
.hero-sub { margin-top: var(--space-6); font-size: var(--text-lg); color: var(--color-text-muted); max-width: 46ch; line-height: 1.45; }
.hero-actions { margin-top: var(--space-8); display: flex; flex-wrap: wrap; gap: var(--space-3); }
.hero-note { margin-top: var(--space-4); font-size: var(--text-xs); color: var(--color-text-faint); }
.hero-note a { color: inherit; text-decoration: underline; text-underline-offset: 2px; }
.hero-note a:hover { color: var(--color-primary); }

.spec-card { border: 1px solid var(--color-rule-strong); background: var(--color-surface); padding: var(--space-6); }
.spec-card dl { display: grid; gap: 0; }
.spec-row { display: flex; justify-content: space-between; gap: var(--space-4); padding-block: var(--space-3); border-bottom: 1px solid var(--color-rule); }
.spec-row:last-child { border-bottom: 0; }
.spec-row dt { font-size: var(--text-xs); letter-spacing: 0.1em; text-transform: uppercase; color: var(--color-text-faint); }
.spec-row dd { font-size: var(--text-sm); font-weight: 600; text-align: right; }
.price-line { display: flex; align-items: baseline; gap: var(--space-2); border-bottom: 1px solid var(--color-rule-strong); padding-bottom: var(--space-4); margin-bottom: var(--space-2); }
.price-line b { font-family: var(--font-display); font-size: var(--text-xl); font-weight: 600; letter-spacing: -0.03em; }
.price-line span { font-size: var(--text-xs); color: var(--color-text-faint); letter-spacing: 0.08em; text-transform: uppercase; }

/* ---------- Ticker rule ---------- */
.marquee-rule {
  border-block: 1px solid var(--color-rule);
  background: var(--color-surface-2);
  overflow: hidden;
}
.marquee-rule ul {
  display: flex; gap: var(--space-8); list-style: none;
  padding-block: var(--space-3);
  font-size: var(--text-xs); letter-spacing: 0.14em; text-transform: uppercase; color: var(--color-text-muted);
  flex-wrap: wrap; justify-content: center;
}
.marquee-rule li { display: flex; align-items: center; gap: var(--space-3); }
.marquee-rule li::before { content: '/'; color: var(--color-primary); font-family: var(--font-mono); }

/* ---------- Deliverables (asymmetric) ---------- */
.deliverables { display: grid; gap: 1px; background: var(--color-rule); border: 1px solid var(--color-rule); }
@media (min-width: 52rem) { .deliverables { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 76rem) { .deliverables { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
.deliverable { background: var(--color-bg); padding: var(--space-6); display: grid; gap: var(--space-3); align-content: start; }
.deliverable--lead { background: var(--color-surface); }
@media (min-width: 52rem) { .deliverable--lead { grid-column: span 2; } }
@media (min-width: 52rem) { .deliverable--wide { grid-column: 1 / -1; } }
.deliverable .num { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-primary); }
.deliverable p { font-size: var(--text-sm); color: var(--color-text-muted); }
.deliverable--lead h3 { font-family: var(--font-display); font-size: var(--text-xl); font-weight: 600; }
.deliverable--lead p { font-size: var(--text-base); max-width: 52ch; }

/* ---------- Guarantee ---------- */
.guarantee { background: var(--color-ink); color: var(--color-text-inverse); border-top: 1px solid var(--color-rule); }
.guarantee .label { color: color-mix(in oklch, var(--color-text-inverse) 60%, transparent); }
.guarantee-grid { display: grid; gap: var(--space-8); }
@media (min-width: 60rem) { .guarantee-grid { grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); align-items: start; } }
.guarantee h2 { font-size: var(--text-2xl); letter-spacing: -0.03em; max-width: 24ch; }
.guarantee h2 em { font-style: normal; color: var(--color-primary); }
.guarantee p { color: color-mix(in oklch, var(--color-text-inverse) 72%, transparent); font-size: var(--text-sm); }
.guarantee ul { list-style: none; display: grid; gap: var(--space-3); margin-top: var(--space-4); }
.guarantee li { font-size: var(--text-sm); padding-left: var(--space-5); position: relative; color: color-mix(in oklch, var(--color-text-inverse) 82%, transparent); }
.guarantee li::before { content: '—'; position: absolute; left: 0; color: var(--color-primary); }

/* ---------- Timeline ---------- */
.timeline { display: grid; gap: 0; counter-reset: step; }
@media (min-width: 60rem) { .timeline { grid-template-columns: repeat(4, minmax(0, 1fr)); border-top: 1px solid var(--color-rule-strong); } }
.step { padding: var(--space-6) var(--space-6) var(--space-8) 0; border-top: 1px solid var(--color-rule); }
@media (min-width: 60rem) {
  .step { border-top: 0; border-right: 1px solid var(--color-rule); padding-right: var(--space-6); }
  .step:last-child { border-right: 0; }
}
.step .clock { font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: 0.06em; color: var(--color-primary); display: block; margin-bottom: var(--space-4); }
.step h3 { font-size: var(--text-base); margin-bottom: var(--space-2); }
.step p { font-size: var(--text-sm); color: var(--color-text-muted); }

/* ---------- Comparison table ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--color-rule); }
table { min-width: 44rem; background: var(--color-surface); }
caption { text-align: left; font-size: var(--text-xs); color: var(--color-text-faint); padding: var(--space-3) var(--space-4); letter-spacing: 0.1em; text-transform: uppercase; border-bottom: 1px solid var(--color-rule); }
th, td { text-align: left; padding: var(--space-4); font-size: var(--text-sm); border-bottom: 1px solid var(--color-rule); vertical-align: top; }
thead th { font-size: var(--text-xs); letter-spacing: 0.1em; text-transform: uppercase; color: var(--color-text-faint); font-weight: 500; }
thead th.own { color: var(--color-primary); }
tbody th { font-weight: 600; width: 22%; color: var(--color-ink); }
td.own { background: var(--color-primary-wash); font-weight: 600; }
tbody tr:last-child th, tbody tr:last-child td { border-bottom: 0; }

/* ---------- Scope ---------- */
.scope-grid { display: grid; gap: var(--space-8); }
@media (min-width: 58rem) { .scope-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.scope-col h3 { margin-bottom: var(--space-4); padding-bottom: var(--space-3); border-bottom: 1px solid var(--color-rule-strong); }
.scope-col ul { list-style: none; display: grid; gap: var(--space-3); }
.scope-col li { font-size: var(--text-sm); color: var(--color-text-muted); display: grid; grid-template-columns: 1.25rem 1fr; gap: var(--space-2); }
.scope-col li::before { content: '＋'; color: var(--color-primary); font-size: var(--text-xs); line-height: 1.7; }
.scope-col--out li::before { content: '−'; color: var(--color-text-faint); }

/* ---------- FAQ ---------- */
.faq { border-top: 1px solid var(--color-rule-strong); }
.faq details { border-bottom: 1px solid var(--color-rule); }
.faq summary {
  cursor: pointer; list-style: none; display: flex; gap: var(--space-4);
  align-items: baseline; padding-block: var(--space-5);
  font-size: var(--text-base); font-weight: 600;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: '+'; margin-left: auto; font-family: var(--font-mono); color: var(--color-primary); font-size: var(--text-lg); line-height: 1; }
.faq details[open] summary::after { content: '−'; }
.faq summary:hover { color: var(--color-primary); }
.faq .q-num { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-text-faint); }
.faq .answer { padding-bottom: var(--space-6); font-size: var(--text-sm); color: var(--color-text-muted); }
.faq .answer p + p { margin-top: var(--space-3); }

/* ---------- Intake / CTA ---------- */
.intake { background: var(--color-surface-2); }
.intake-grid { display: grid; gap: clamp(var(--space-8), 5vw, var(--space-16)); }
@media (min-width: 60rem) { .intake-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr); align-items: start; } }
.intake h2 { font-size: var(--text-2xl); letter-spacing: -0.03em; }
.intake ol { padding-left: var(--space-5); display: grid; gap: var(--space-2); font-size: var(--text-sm); color: var(--color-text-muted); }
.cta-card { border: 1px solid var(--color-ink); background: var(--color-bg); padding: var(--space-6); display: grid; gap: var(--space-4); }
.cta-card .btn { width: 100%; }
.cta-meta { font-size: var(--text-xs); color: var(--color-text-faint); }
.cta-meta a { color: var(--color-primary); text-decoration: none; font-weight: 600; word-break: break-all; }
.cta-meta a:hover { text-decoration: underline; }

/* ---------- Chinese summary ---------- */
.zh-summary { border: 1px solid var(--color-rule); background: var(--color-surface); padding: var(--space-6); display: grid; gap: var(--space-3); }
.zh-summary p, .zh-summary li { font-size: var(--text-sm); color: var(--color-text-muted); }
.zh-summary ul { padding-left: var(--space-5); display: grid; gap: var(--space-2); }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--color-rule-strong); padding-block: var(--space-10) var(--space-12); }
.footer-grid { display: grid; gap: var(--space-8); }
@media (min-width: 52rem) { .footer-grid { grid-template-columns: minmax(0, 1.4fr) repeat(2, minmax(0, 1fr)); } }
.site-footer p, .site-footer li { font-size: var(--text-xs); color: var(--color-text-faint); }
.site-footer h4 { font-size: var(--text-xs); letter-spacing: 0.12em; text-transform: uppercase; color: var(--color-text-muted); margin-bottom: var(--space-3); font-weight: 500; }
.site-footer ul { list-style: none; display: grid; gap: var(--space-2); }
.site-footer a { color: var(--color-text-muted); text-decoration: none; }
.site-footer a:hover { color: var(--color-primary); }
.legal { margin-top: var(--space-8); padding-top: var(--space-4); border-top: 1px solid var(--color-rule); }

/* ---------- Sticky mobile CTA ---------- */
.mobile-bar {
  position: fixed; inset-inline: 0; bottom: 0; z-index: 60;
  display: flex; gap: var(--space-3); align-items: center; justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  background: color-mix(in oklch, var(--color-bg) 95%, transparent);
  border-top: 1px solid var(--color-rule-strong);
  backdrop-filter: blur(10px);
}
.mobile-bar .price { font-size: var(--text-xs); letter-spacing: 0.08em; text-transform: uppercase; color: var(--color-text-muted); }
@media (min-width: 48rem) { .mobile-bar { display: none; } }
@media (max-width: 47.99rem) { body { padding-bottom: 5rem; } }

/* ---------- CJK adjustments (JS sets data-lang / lang on nodes) ---------- */
[lang='zh-Hans'], [data-lang='zh'] body {
  font-family: var(--font-body), 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
}
[data-lang='zh'] h1 {
  font-size: var(--text-2xl);
  letter-spacing: 0;
  line-height: 1.22;
  max-width: 20ch;
  font-weight: 700;
}
[data-lang='zh'] h2 { letter-spacing: 0; line-height: 1.3; }
[data-lang='zh'] .guarantee h2, [data-lang='zh'] .intake h2 { font-size: var(--text-xl); }
[data-lang='zh'] .hero-sub { line-height: 1.6; }
[data-lang='zh'] .label, [data-lang='zh'] .slot-pill, [data-lang='zh'] .marquee-rule ul { letter-spacing: 0.06em; }

/* Language visibility: JS sets data-lang on <html> */
[data-lang='en'] [lang='zh-Hans']:not(.zh-always) { display: none; }
[data-lang='zh'] [data-i18n-en] { }