/* Buvlor Rewarded Ads — sales page styles.css v2
 * Shared design tokens with docs (design_guide_v2.md §4).
 * Sales-specific layout in §3 below.
 */

/* ============================================================
   DESIGN TOKENS (identical to docs/build.mjs — shared system)
   ============================================================ */
:root {
  --color-bg: #FFFFFF;
  --color-bg-subtle: #FAFAFA;
  --color-bg-elevated: #FFFFFF;
  --color-bg-overlay: rgba(255, 255, 255, 0.72);
  --color-bg-dark: #0A0A0A;
  --color-bg-dark-elevated: #171717;

  --color-surface-1: #FAFAFA;
  --color-surface-2: #F2F2F2;
  --color-surface-3: #EBEBEB;

  --color-text-primary: #171717;
  --color-text-secondary: #666666;
  --color-text-tertiary: #8F8F8F;
  --color-text-quaternary: #A1A1A1;
  --color-text-emphasis: #0A0A0A;
  --color-text-on-dark: #EDEDED;
  --color-text-on-dark-secondary: #A1A1A1;
  --color-text-on-dark-tertiary: #7A7A7A;

  --color-border: #EBEBEB;
  --color-border-strong: #E0E0E0;
  --color-border-dark: #262626;

  --color-link: #0070F3;
  --color-link-hover: #0761D1;
  --color-link-soft: #E5F0FF;

  --color-success: #3CCB7F;
  --color-success-bg: #E6F9EE;
  --color-success-text: #1F8049;
  --color-warning: #F5A623;
  --color-warning-bg: #FFF4DC;
  --color-warning-text: #A56500;
  --color-error: #E5484D;
  --color-error-bg: #FFE5E5;
  --color-error-text: #B5363A;

  --font-sans: 'Geist', -apple-system, BlinkMacSystemFont, 'Pretendard',
               'Apple SD Gothic Neo', 'Malgun Gothic', system-ui, sans-serif;
  --font-mono: 'Geist Mono', 'SF Mono', Menlo, Consolas,
               'Liberation Mono', monospace;

  --text-xs: 12px;
  --text-sm: 13px;
  --text-base: 14px;
  --text-md: 16px;
  --text-lg: 18px;
  --text-xl: 20px;
  --text-2xl: 24px;
  --text-3xl: 32px;
  --text-4xl: 48px;
  --text-5xl: 64px;

  --leading-tight: 1.05;
  --leading-snug: 1.2;
  --leading-base: 1.4;
  --leading-normal: 1.5;
  --leading-relaxed: 1.6;
  --leading-loose: 1.65;

  --tracking-tightest: -0.04em;
  --tracking-tighter: -0.03em;
  --tracking-tight: -0.025em;
  --tracking-snug: -0.02em;
  --tracking-base: -0.005em;
  --tracking-none: 0;
  --tracking-wide: 0.04em;

  --weight-regular: 400;
  --weight-medium: 500;
  --weight-semibold: 600;
  --weight-bold: 700;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;
  --space-24: 96px;
  --space-32: 128px;

  --header-height: 64px;
  --sidebar-width: 256px;
  --toc-width: 220px;
  --content-max-width: 720px;
  --docs-total-max-width: 1400px;
  --sales-max-width: 1100px;

  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;

  --shadow-none: none;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.12);

  --transition-fast: 100ms ease-out;
  --transition-base: 150ms ease-out;
  --transition-slow: 250ms cubic-bezier(0.4, 0, 0.2, 1);

  --z-base: 0;
  --z-sticky: 100;
  --z-header: 200;
  --z-drawer: 300;
  --z-modal: 400;
  --z-toast: 500;
}

/* Dark mode tokens — Phase 2 */
[data-theme="dark"] {
  --color-bg: #000000;
  --color-bg-subtle: #0A0A0A;
  --color-surface-2: #171717;
  --color-text-primary: #EDEDED;
  --color-text-secondary: #A1A1A1;
  --color-text-tertiary: #7A7A7A;
  --color-text-emphasis: #FFFFFF;
  --color-border: #262626;
  --color-border-strong: #333333;
  --color-link: #3291FF;
  --color-link-hover: #52A8FF;
}

/* ============================================================
   RESET / BASE
   ============================================================ */
* { box-sizing: border-box; margin: 0; padding: 0; }
[hidden] { display: none !important; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-sans);
  font-size: var(--text-md);
  line-height: var(--leading-relaxed);
  letter-spacing: var(--tracking-base);
  color: var(--color-text-primary);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: var(--color-link); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: var(--color-link-hover); }

button { font-family: inherit; cursor: pointer; }

:focus-visible {
  outline: 2px solid var(--color-link);
  outline-offset: 2px;
  border-radius: var(--radius-xs);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-text-primary);
  color: #FFFFFF;
  padding: 8px var(--space-3);
  border-radius: var(--radius-sm);
  z-index: var(--z-toast);
  font-size: var(--text-sm);
}
.skip-link:focus { left: var(--space-3); top: var(--space-3); }

/* ============================================================
   HEADER (shared with docs)
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: var(--color-bg-overlay);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--color-border);
}
.site-header-inner {
  max-width: var(--sales-max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text-primary);
  text-decoration: none;
}
.brand:hover { text-decoration: none; color: var(--color-text-primary); }
.brand-logo {
  display: inline-block;
  flex-shrink: 0;
  border-radius: 7px;
  overflow: hidden;
}
/* Footer logo mark — now an inline SVG; CSS only handles layout */
.brand-mark {
  display: inline-block;
  flex-shrink: 0;
}
.brand-mark-sm {
  display: inline-block;
  flex-shrink: 0;
  vertical-align: middle;
}
.brand-name {
  font-size: 15px;
  font-weight: var(--weight-semibold);
  color: var(--color-text-primary);
  white-space: nowrap;
}
.brand-name-compact { display: none; }

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}
.nav-text-link {
  font-size: var(--text-base);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}
.nav-text-link:hover { color: var(--color-text-primary); text-decoration: none; }

/* Lang segment */
.lang-toggle {
  display: inline-flex;
  align-items: center;
  padding: 3px;
  background: var(--color-surface-2);
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  gap: 2px;
}
.lang-opt {
  padding: 3px 10px;
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  border: 0;
  background: transparent;
  border-radius: var(--radius-full);
  color: var(--color-text-tertiary);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}
.lang-opt:hover { color: var(--color-text-primary); }
.lang-opt[aria-current="true"] {
  background: var(--color-bg);
  color: var(--color-text-primary);
  box-shadow: var(--shadow-sm);
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  font-size: var(--text-base);
  font-weight: var(--weight-medium);
  transition: background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}
.btn-sm { padding: 6px 12px; font-size: var(--text-sm); }
.btn-lg { padding: var(--space-3) var(--space-5); font-size: var(--text-base); }

/* Primary (black on light bg) — Vercel pattern */
.btn-primary {
  background: var(--color-text-emphasis);
  color: #FFFFFF;
  border: 1px solid transparent;
}
.btn-primary:hover { background: #383838; color: #FFFFFF; text-decoration: none; }

/* Secondary */
.btn-secondary {
  background: var(--color-bg);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
}
.btn-secondary:hover { background: var(--color-bg-subtle); text-decoration: none; }

/* Dark CTA section variants */
.btn-primary-dark {
  background: #FFFFFF;
  color: #000000;
  border: 1px solid transparent;
}
.btn-primary-dark:hover { background: #EBEBEB; color: #000000; text-decoration: none; }
.btn-secondary-dark {
  background: transparent;
  color: var(--color-text-on-dark);
  border: 1px solid #333333;
}
.btn-secondary-dark:hover { background: rgba(255,255,255,0.06); text-decoration: none; }

/* ============================================================
   SALES LAYOUT CONTAINER
   ============================================================ */
.sales-container {
  max-width: var(--sales-max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}
.sales-container-narrow {
  max-width: 640px;
  text-align: center;
}

/* ============================================================
   SECTION 1: HERO
   ============================================================ */
.s-hero {
  padding-block: var(--space-32);
  background: var(--color-bg);
}

.hero-h1 {
  font-size: var(--text-5xl);
  font-weight: var(--weight-semibold);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tightest);
  color: var(--color-text-emphasis);
  max-width: 800px;
  margin-bottom: var(--space-4);
}
.hero-sub {
  font-size: var(--text-xl);
  line-height: var(--leading-normal);
  color: var(--color-text-secondary);
  max-width: 640px;
  margin-bottom: var(--space-8);
  letter-spacing: -0.01em;
}
.hero-cta-row {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-bottom: var(--space-16);
}

/* Floating code card */
.hero-code {
  max-width: 720px;
  border-radius: var(--radius-md);
  background: var(--color-bg-dark);
  border: 1px solid var(--color-border-dark);
  overflow: hidden;
}
.hero-code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-4);
  height: 40px;
  background: var(--color-bg-dark-elevated);
  border-bottom: 1px solid var(--color-border-dark);
}
.hero-code-filename {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-on-dark-secondary);
}
.hero-code-pre {
  margin: 0;
  padding: var(--space-5) var(--space-6);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: var(--leading-loose);
  color: #EDEDED;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.hero-code-body { font-family: inherit; }

/* Copy btn (shared with docs) */
.copy-btn {
  padding: 4px 10px;
  height: 28px;
  border: 0;
  background: transparent;
  color: var(--color-text-on-dark-secondary);
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}
.copy-btn:hover { background: rgba(255,255,255,0.06); color: var(--color-text-on-dark); }
.copy-btn.is-copied { color: var(--color-success); }

/* ============================================================
   SECTION 2: STAT STRIP (#FAFAFA)
   ============================================================ */
.s-stats {
  padding-block: var(--space-16);
  background: var(--color-bg-subtle);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}
.stats-grid {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-8);
  flex-wrap: wrap;
}
.stat-item {
  text-align: center;
  min-width: 140px;
}
.stat-number {
  font-size: 56px;
  font-weight: var(--weight-semibold);
  line-height: 1;
  letter-spacing: var(--tracking-tighter);
  color: var(--color-text-emphasis);
  white-space: nowrap;
}
.stat-label {
  font-size: var(--text-base);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
  margin-top: var(--space-2);
}
.stat-divider {
  width: 1px;
  height: 60px;
  background: var(--color-border);
  flex-shrink: 0;
}

/* ============================================================
   SECTION 3: FEATURE CARDS
   ============================================================ */
.s-features {
  padding-block: var(--space-24);
  background: var(--color-bg);
}
.section-header {
  margin-bottom: var(--space-16);
}
.section-h2 {
  font-size: var(--text-4xl);
  font-weight: var(--weight-semibold);
  line-height: 1.1;
  letter-spacing: var(--tracking-tighter);
  color: var(--color-text-emphasis);
  max-width: 600px;
  margin-bottom: var(--space-3);
}
.section-sub {
  font-size: var(--text-lg);
  line-height: var(--leading-normal);
  color: var(--color-text-secondary);
}

/* 2×2 grid (4 cards) — Vercel 3-col collapses to 2-col at medium */
.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}
.feature-card {
  padding: var(--space-8);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-base);
}
.feature-card:hover { border-color: var(--color-border-strong); }
.feature-icon {
  color: var(--color-text-primary);
  margin-bottom: var(--space-6);
}
.feature-title {
  font-size: var(--text-xl);
  font-weight: var(--weight-semibold);
  letter-spacing: -0.015em;
  color: var(--color-text-emphasis);
  margin-bottom: var(--space-2);
}
.feature-body {
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
  color: var(--color-text-secondary);
}

/* ============================================================
   SECTION 4: COMPARISON (#FAFAFA)
   ============================================================ */
.s-comparison {
  padding-block: var(--space-24);
  background: var(--color-bg-subtle);
}
.comparison-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  margin-top: var(--space-16);
}
.comparison-col {
  padding: var(--space-6);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}
/* Buvlor column highlighted */
.comparison-col-featured {
  border: 1.5px solid var(--color-text-emphasis);
  position: relative;
}
.comparison-col-head {
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
  color: var(--color-text-emphasis);
  margin-bottom: var(--space-4);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.recommended-pill {
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: var(--color-link);
  color: #FFFFFF;
}
.comparison-row {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: 8px 0;
  border-bottom: 1px solid var(--color-border);
  font-size: var(--text-base);
  color: var(--color-text-secondary);
}
.comparison-row:last-child { border-bottom: none; }
.comparison-feature { color: var(--color-text-primary); }
.check-yes { color: var(--color-success); font-weight: var(--weight-semibold); }
.check-no  { color: var(--color-text-tertiary); }

/* ============================================================
   SECTION 5: COMPANY STRIP
   ============================================================ */
.s-company {
  padding-block: var(--space-16);
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
}
.company-text {
  font-size: var(--text-lg);
  line-height: var(--leading-normal);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-4);
}
.company-link {
  font-size: var(--text-base);
  font-weight: var(--weight-medium);
  color: var(--color-link);
}
.company-link:hover { color: var(--color-link-hover); text-decoration: underline; }

/* ============================================================
   SECTION 6: DARK CTA (#0A0A0A)
   ============================================================ */
.s-cta-dark {
  padding-block: var(--space-32);
  background: var(--color-bg-dark);
  text-align: center;
}
.cta-h2 {
  font-size: var(--text-4xl);
  font-weight: var(--weight-semibold);
  line-height: 1.1;
  letter-spacing: var(--tracking-tighter);
  color: #FFFFFF;
  margin-bottom: var(--space-4);
}
.cta-sub {
  font-size: var(--text-lg);
  line-height: var(--leading-normal);
  color: var(--color-text-on-dark-secondary);
  margin-bottom: var(--space-8);
}
.cta-row {
  display: flex;
  gap: var(--space-3);
  justify-content: center;
  flex-wrap: wrap;
}

/* ============================================================
   FOOTER (shared with docs)
   ============================================================ */
.site-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-subtle);
}
.site-footer-inner {
  max-width: var(--sales-max-width);
  margin: 0 auto;
  padding: var(--space-8) var(--space-6);
  display: flex;
  align-items: center;
  gap: var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
}
.site-footer-brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
}
.site-footer-links {
  display: flex;
  gap: var(--space-6);
  margin-left: auto;
}
.footer-link {
  color: var(--color-text-secondary);
  font-weight: var(--weight-medium);
  font-size: var(--text-sm);
  text-decoration: none;
  transition: color var(--transition-fast);
}
.footer-link:hover { color: var(--color-text-primary); }

/* ============================================================
   RESPONSIVE
   ============================================================ */

/* 768–1099px */
@media (max-width: 1099px) {
  .sales-container { padding: 0 var(--space-8); }
}

/* 640–767px: hero h1 48px, features 2-col still ok, stats 2-col */
@media (max-width: 767px) {
  .s-hero { padding-block: var(--space-20); }
  .hero-h1 { font-size: 48px; }
  .hero-sub { font-size: var(--text-md); }
  .hero-cta-row { margin-bottom: var(--space-10); }
  .section-h2 { font-size: var(--text-3xl); }
  .stats-grid { gap: var(--space-6); }
  .stat-number { font-size: 40px; }
  .stat-divider { display: none; }
  .comparison-grid { grid-template-columns: 1fr; }
  .features-grid { grid-template-columns: 1fr; }
  .s-cta-dark { padding-block: var(--space-20); }
  .cta-h2 { font-size: var(--text-3xl); }
  .site-footer-inner { flex-wrap: wrap; }
  .site-footer-links { margin-left: 0; }
}

/* < 640px: hero h1 40px, all grids 1-col */
@media (max-width: 639px) {
  .sales-container { padding: 0 var(--space-4); }
  .site-header-inner {
    padding-inline: var(--space-4);
    gap: var(--space-2);
  }
  .brand { gap: var(--space-2); }
  .brand-name-full { display: none; }
  .brand-name-compact { display: inline; }
  .site-nav { gap: var(--space-2); }
  .site-nav .nav-text-link { display: none; }
  .lang-opt { padding-inline: var(--space-2); }
  .s-hero { padding-block: var(--space-16); }
  .hero-h1 { font-size: 40px; }
  .section-h2 { font-size: var(--text-2xl); }
  .feature-card { padding: var(--space-6); }
}

@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;
  }
}