/**
 * Landing Page Styles
 * TauFunctions — Dark-first theme, buggazi.com pattern
 * No Bootstrap — pure custom CSS
 */

/* ── CSS Variables ── */
:root {
  --bg: #0c0a08;
  --bg2: #131110;
  --bg3: #1e1c1a;
  --text: #faf9f7;
  --muted: #6b6660;
  --accent: #d4a574;
  --accent-hover: #c4956a;
  --border: #2d2a26;
  --success: #3d9970;
  --danger: #c0392b;
  --warning: #c9943e;
  --radius: 8px;
  --radius-sm: 6px;
  --radius-lg: 12px;
  --font-sans: 'Geist Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

/* ── Light mode overrides ── */
body.landing-light {
  --bg: #faf9f7;
  --bg2: #f3f1f6;
  --bg3: #e8e5ec;
  --text: #0c0a08;
  --muted: #6b6660;
  --accent: #b8865a;
  --border: #e0dde4;
}

body.landing-light .nav-logo-img {
  filter: none !important;
}

body.landing-light .hero {
  background: var(--bg2);
}

body.landing-light .compare-highlight {
  background: var(--bg3);
}

body.landing-light .step-code pre,
body.landing-light .step-code .code-header {
  background: #1e1c1a;
  color: #faf9f7;
}

body.landing-light .step-code .code-header code {
  color: #d4a574;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); }

img { max-width: 100%; height: auto; }

code { font-family: var(--font-mono); font-size: 0.8125em; }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
  font-family: var(--font-sans);
  line-height: 1.4;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
}

.btn-primary:hover {
  background: var(--accent-hover);
  color: var(--bg);
  border-color: var(--accent-hover);
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}

.btn-ghost:hover {
  background: var(--bg3);
  color: var(--text);
}

.btn-lg {
  padding: 0.75rem 1.75rem;
  font-size: 1rem;
}

.btn-block {
  display: block;
  width: 100%;
  text-align: center;
}

/* ── Navigation ── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(12, 10, 8, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow 0.3s ease;
}

.nav.scrolled {
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.nav-logo-img {
  height: 28px;
  filter: brightness(0) invert(1);
}

body.landing-light .nav {
  background: rgba(250, 249, 247, 0.92);
}

body.landing-light .nav-logo-img {
  filter: none;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-links > a:not(.btn) {
  color: var(--muted);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.5rem 0.75rem;
  transition: color 0.15s ease;
  text-decoration: none;
}

.nav-links > a:not(.btn):hover {
  color: var(--text);
}

/* Nav Dropdown */
.nav-dropdown { position: relative; }

.nav-dropdown-menu {
  display: none;
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.5rem 0;
  min-width: 180px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  z-index: 100;
}

.nav-dropdown.open .nav-dropdown-menu { display: block; }

.nav-dropdown-menu a {
  display: block;
  padding: 0.5rem 1rem;
  font-size: 0.8125rem;
  color: var(--muted);
  transition: all 0.15s ease;
}

.nav-dropdown-menu a:hover {
  color: var(--text);
  background: var(--bg3);
}

/* Mobile Nav */
.nav-mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-mobile-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 1px;
  transition: all 0.2s ease;
}

.nav-mobile {
  display: none;
  flex-direction: column;
  padding: 1rem 1.5rem 1.5rem;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
}

.nav-mobile.open { display: flex; }

.nav-mobile a {
  padding: 0.75rem 0;
  color: var(--muted);
  font-size: 0.9375rem;
  border-bottom: 1px solid var(--border);
}

.nav-mobile a:last-child { border-bottom: none; }

.nav-mobile .btn {
  margin-top: 0.75rem;
  text-align: center;
  justify-content: center;
}

/* ── Hero Section ── */
.hero {
  padding: 8rem 0 5rem;
  text-align: center;
  position: relative;
  background: var(--bg);
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-block;
  padding: 0.375rem 1rem;
  background: rgba(212, 165, 116, 0.12);
  color: var(--accent);
  font-size: 0.8125rem;
  font-weight: 600;
  border-radius: 9999px;
  margin-bottom: 1.5rem;
  letter-spacing: 0.02em;
}

.hero h1 {
  font-size: clamp(2rem, 4vw + 0.5rem, 3.25rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
  color: var(--text);
}

.hero-subtitle {
  font-size: clamp(1rem, 1.5vw + 0.5rem, 1.1875rem);
  color: var(--muted);
  line-height: 1.7;
  max-width: 640px;
  margin: 0 auto 2rem;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
}

.hero-stats .stat {
  text-align: center;
}

.hero-stats .stat-value {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
}

.hero-stats .stat-label {
  display: block;
  font-size: 0.75rem;
  color: var(--muted);
  margin-top: 0.25rem;
}

/* ── Section Utilities ── */
.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 3rem;
}

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 1rem;
}

.section-header h2 {
  font-size: clamp(1.5rem, 3vw + 0.25rem, 2.25rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.section-header p {
  font-size: 0.9375rem;
  color: var(--muted);
  line-height: 1.7;
}

/* ── Why TauFunctions Section ── */
.why-not {
  padding: 5rem 0;
  background: var(--bg2);
}

.why-not-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.why-not-card {
  padding: 1.75rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: var(--bg);
}

.why-not-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  margin-bottom: 1rem;
  font-size: 1.125rem;
}

.why-not-old .why-not-icon { color: var(--danger); background: rgba(192, 57, 43, 0.12); }
.why-not-new .why-not-icon { color: var(--success); background: rgba(61, 153, 112, 0.12); }

.why-not-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.why-not-card ul {
  list-style: none;
  padding: 0;
  margin: 0 0 1rem;
}

.why-not-card li {
  display: flex;
  align-items: flex-start;
  gap: 0.625rem;
  padding: 0.375rem 0;
  font-size: 0.8125rem;
  color: var(--muted);
  line-height: 1.5;
}

.why-not-card li i {
  margin-top: 2px;
  flex-shrink: 0;
}

.why-not-old li i { color: var(--danger); }
.why-not-new li i { color: var(--success); }

.why-not-card code {
  background: var(--bg3);
  padding: 0.125rem 0.375rem;
  border-radius: 3px;
  font-size: 0.75rem;
  color: var(--accent);
}

.why-not-verdict {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text);
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
  margin: 0;
}

/* ── Features Section ── */
.features {
  padding: 5rem 0;
  background: var(--bg);
}

.mode-label {
  color: var(--accent);
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1rem;
  font-weight: 600;
}

.features-grid {
  display: grid;
  gap: 1.25rem;
  margin-bottom: 2.5rem;
}

.features-grid-4 { grid-template-columns: repeat(4, 1fr); }
.features-grid-3 { grid-template-columns: repeat(3, 1fr); }

.feature-card {
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  transition: border-color 0.2s ease;
}

.feature-card:hover {
  border-color: var(--muted);
}

.feature-card-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.feature-card-header h3 {
  font-size: 0.9375rem;
  font-weight: 600;
  margin: 0;
}

.feature-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg3);
  border-radius: var(--radius-sm);
  color: var(--muted);
  font-size: 0.875rem;
  flex-shrink: 0;
}

.feature-card p {
  font-size: 0.8125rem;
  color: var(--muted);
  line-height: 1.6;
  margin: 0;
}

/* ── How It Works Section ── */
.how-it-works {
  padding: 5rem 0;
  background: var(--bg2);
}

.steps {
  max-width: 800px;
  margin: 0 auto;
}

.step {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.step:last-child { margin-bottom: 0; }

.step-number {
  width: 40px;
  height: 40px;
  background: var(--accent);
  color: var(--bg);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
  flex-shrink: 0;
}

.step-content {
  flex: 1;
}

.step-content h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  line-height: 1.4;
}

.step-content > p {
  font-size: 0.875rem;
  color: var(--muted);
  line-height: 1.7;
  margin-bottom: 1rem;
}

.step-code {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
}

.step-code .code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.625rem 1rem;
  background: #1a1816;
  border-bottom: 1px solid var(--border);
}

.step-code .code-header code {
  color: var(--accent);
  font-size: 0.75rem;
}

.copy-btn {
  background: none;
  border: none;
  color: var(--muted);
  cursor: pointer;
  padding: 0.25rem;
  font-size: 0.8125rem;
  transition: color 0.15s ease;
}

.copy-btn:hover { color: var(--text); }

.step-code pre {
  background: #141210;
  color: #c8c4be;
  padding: 1rem;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.7;
  overflow-x: auto;
  white-space: pre;
}

/* ── Comparison Section ── */
.compare {
  padding: 5rem 0;
  background: var(--bg);
}

.compare-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.compare-card {
  padding: 1.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--bg);
}

.compare-card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.compare-label {
  font-size: 0.75rem;
  color: var(--muted);
  margin-bottom: 1.25rem;
}

.compare-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.compare-card li {
  padding: 0.375rem 0;
  font-size: 0.8125rem;
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  line-height: 1.5;
}

.compare-yes::before {
  content: '\2713';
  color: var(--success);
  font-weight: 700;
  flex-shrink: 0;
}

.compare-no::before {
  content: '\2717';
  color: var(--danger);
  font-weight: 700;
  flex-shrink: 0;
}

.compare-highlight {
  border-color: var(--accent);
  background: var(--bg2);
}

/* ── Founder Section ── */
.founder {
  background: var(--bg2);
}

/* ── Pricing Section ── */
.pricing {
  padding: 5rem 0;
  background: var(--bg2);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
}

.pricing-card {
  padding: 1.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--bg);
  display: flex;
  flex-direction: column;
  position: relative;
}

.pricing-card.featured {
  border-color: var(--accent);
}

.pricing-badge {
  position: absolute;
  top: -1px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent);
  color: var(--bg);
  padding: 0.25rem 1rem;
  font-size: 0.6875rem;
  font-weight: 600;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  letter-spacing: 0.03em;
}

.pricing-header {
  text-align: center;
  margin-bottom: 1.25rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border);
}

.pricing-header h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.price {
  margin-bottom: 0.5rem;
}

.price-amount {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.price-period {
  font-size: 0.875rem;
  color: var(--muted);
}

.pricing-header p {
  font-size: 0.8125rem;
  color: var(--muted);
  margin: 0;
}

.pricing-features {
  list-style: none;
  padding: 0;
  margin: 0 0 1.5rem;
  flex: 1;
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.375rem 0;
  font-size: 0.8125rem;
  color: var(--muted);
}

.pricing-features li svg {
  width: 16px;
  height: 16px;
  color: var(--success);
  flex-shrink: 0;
}

/* ── CTA Section ── */
.cta {
  padding: 5rem 0;
  background: var(--bg);
}

.cta-content {
  text-align: center;
  max-width: 640px;
  margin: 0 auto;
}

.cta-content h2 {
  font-size: clamp(1.5rem, 2.5vw + 0.25rem, 2rem);
  font-weight: 700;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.cta-content p {
  font-size: 0.9375rem;
  color: var(--muted);
  line-height: 1.7;
  margin-bottom: 2rem;
}

.cta-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ── Footer ── */
.footer {
  padding: 4rem 0 2rem;
  background: var(--bg2);
  border-top: 1px solid var(--border);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 3rem;
}

.footer-brand p {
  font-size: 0.8125rem;
  color: var(--muted);
  margin-top: 0.75rem;
  line-height: 1.6;
}

.footer-links h4 {
  font-size: 0.8125rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--text);
}

.footer-links a {
  display: block;
  font-size: 0.8125rem;
  color: var(--muted);
  padding: 0.25rem 0;
  transition: color 0.15s ease;
}

.footer-links a:hover { color: var(--text); }

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.footer-bottom p {
  font-size: 0.75rem;
  color: var(--muted);
  margin: 0;
}

.footer-social {
  display: flex;
  gap: 0.75rem;
}

.footer-social a {
  color: var(--muted);
  transition: color 0.15s ease;
}

.footer-social a:hover { color: var(--text); }

.footer-social svg {
  width: 20px;
  height: 20px;
}

/* ── Scroll Reveal ── */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── Responsive ── */
@media (max-width: 1024px) {
  .features-grid-4 { grid-template-columns: repeat(2, 1fr); }
  .pricing-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-mobile-toggle { display: flex; }

  .hero { padding: 6rem 0 3rem; }

  .hero h1 {
    font-size: clamp(1.5rem, 5vw, 2.25rem);
  }

  .hero-stats {
    gap: 1rem;
  }

  .hero-stats .stat-value {
    font-size: 1.25rem;
  }

  .why-not-grid { grid-template-columns: 1fr; }
  .features-grid-4,
  .features-grid-3 { grid-template-columns: 1fr; }
  .compare-grid { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: 1fr; }

  .step {
    flex-direction: column;
    gap: 1rem;
  }

  .footer-grid { grid-template-columns: 1fr; }

  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero-cta {
    flex-direction: column;
    align-items: center;
  }

  .hero-cta .btn {
    width: 100%;
    justify-content: center;
  }

  .hero-stats {
    flex-direction: column;
    gap: 0.5rem;
  }

  .hero-stats .stat {
    display: flex;
    align-items: center;
    gap: 0.5rem;
  }

  .cta-actions {
    flex-direction: column;
  }

  .cta-actions .btn {
    width: 100%;
    justify-content: center;
  }
}

/* ── Print ── */
@media print {
  .nav, .hero, .cta, .footer, .sc-bubble, .sc-panel, #modeToggle { display: none !important; }
  .features, .pricing, .compare { page-break-inside: avoid; }
  body { background: #fff; color: #000; }
}