/* deepfakedetector.ai — shared design system */
:root {
  --ink: #0E1014;
  --charcoal: #161A20;
  --steel: #20262E;
  --graphite: #383E48;
  --stone: #6E7280;
  --mist: #B5B8BE;
  --bone: #F5F5F2;
  --paper: #FFFFFF;
  --paper-warm: #ECECE6;
  --signal: #2240E6;
  --signal-soft: #2240E614;
  --authentic: #047857;
  --suspect: #B91C1C;
  --caution: #B45309;
  --rule-dark: #232932;
  --rule-light: #E8E8E2;
  --f-sans: "Geist", "Söhne", "Inter Tight", system-ui, sans-serif;
  --f-mono: "Geist Mono", "JetBrains Mono", ui-monospace, monospace;
  --maxw: 1240px;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; font-family: var(--f-sans); background: var(--paper); color: var(--ink); -webkit-font-smoothing: antialiased; }
::selection { background: var(--signal); color: white; }
body { font-size: 16px; line-height: 1.55; }
a { color: inherit; text-decoration: none; }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 28px; }
.mono { font-family: var(--f-mono); }
.eyebrow { font-family: var(--f-mono); font-size: 11px; font-weight: 500; letter-spacing: 0.12em; text-transform: uppercase; color: var(--stone); }
.dark { background: var(--ink); color: var(--bone); }
.dark .eyebrow { color: var(--mist); }
.light { background: var(--paper); color: var(--ink); }
.cream { background: var(--bone); color: var(--ink); }
.charcoal { background: var(--charcoal); color: var(--bone); }

/* Top nav */
nav.top { position: sticky; top: 0; z-index: 50; background: var(--ink); border-bottom: 1px solid transparent; color: var(--bone); transition: border-color .25s; }
nav.top.is-scrolled { border-bottom-color: rgba(255,255,255,0.06); }
nav.top .inner { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 32px; max-width: var(--maxw); margin: 0 auto; padding: 12px 28px; font-size: 14px; }
.logo { display: inline-flex; align-items: center; gap: 9px; font-weight: 500; letter-spacing: -0.022em; color: var(--bone); font-size: 15.5px; }
.logo .glyph { width: 16px; height: 16px; flex-shrink: 0; display: block; }
.logo .wm { display: inline-flex; align-items: baseline; }
.logo .wm .deep { color: var(--bone); font-weight: 600; }
.logo .wm .det  { color: var(--mist); font-weight: 400; }
nav.top .links { display: flex; gap: 0; justify-self: center; }
nav.top .links a { padding: 6px 14px; color: var(--mist); font-size: 13.5px; transition: color .12s; }
nav.top .links a:hover, nav.top .links a.active { color: var(--bone); }
nav.top .actions { display: flex; gap: 4px; align-items: center; }
nav.top .actions .signin { color: var(--mist); font-size: 13.5px; padding: 8px 14px; }
nav.top .actions .signin:hover { color: var(--bone); }
nav.top .actions .cta { background: var(--bone); color: var(--ink); padding: 8px 14px; border-radius: 4px; font-size: 13.5px; font-weight: 500; border: 1px solid var(--bone); }
nav.top .actions .cta:hover { background: white; }

/* Hamburger button — hidden on desktop */
.menu-btn { display: none; background: none; border: none; cursor: pointer; padding: 8px; color: var(--bone); align-items: center; justify-content: center; border-radius: 4px; transition: background .12s; flex-shrink: 0; }
.menu-btn:hover { background: rgba(255,255,255,0.08); }

/* Mobile dropdown panel */
.mobile-menu { display: none; background: var(--ink); border-bottom: 1px solid var(--rule-dark); padding: 4px 0 12px; }
.mobile-menu a { display: block; padding: 11px 28px; color: var(--mist); font-size: 15px; border-bottom: 1px solid var(--rule-dark); transition: color .12s; }
.mobile-menu a:last-child { border-bottom: 0; }
.mobile-menu a:hover, .mobile-menu a:active { color: var(--bone); }
.mobile-menu a.cta-link { color: var(--signal); font-weight: 500; }
.mobile-menu.open { display: block; }

/* Buttons */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 9px 14px; border-radius: 4px; font-family: var(--f-sans); font-size: 13.5px; font-weight: 500; border: 1px solid transparent; cursor: pointer; transition: background .12s, border-color .12s, color .12s; letter-spacing: -0.005em; }
.btn--primary { background: var(--signal); color: white; }
.btn--primary:hover { background: #1A33C9; }
.btn--ink { background: var(--ink); color: var(--bone); }
.btn--ink:hover { background: #1A1F27; }
.btn--bone { background: var(--bone); color: var(--ink); border-color: var(--rule-light); }
.btn--bone:hover { background: white; }
.btn--ghost-dark { background: transparent; color: var(--bone); border-color: var(--rule-dark); }
.btn--ghost-dark:hover { border-color: var(--mist); }
.btn--ghost-light { background: transparent; color: var(--ink); border-color: var(--rule-light); }
.btn--ghost-light:hover { border-color: var(--graphite); }
.btn--lg { padding: 13px 20px; font-size: 14.5px; border-radius: 5px; }

/* Hero */
.hero { position: relative; overflow: hidden; padding: 72px 0 112px; border-bottom: 1px solid var(--rule-dark); }
.hero-inner { position: relative; z-index: 1; max-width: var(--maxw); margin: 0 auto; padding: 0 28px; display: grid; grid-template-columns: 1.2fr 1fr; gap: 96px; align-items: center; }
.hero .kicker { display: inline-block; font-family: var(--f-mono); font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--stone); }
.hero h1 { font-size: clamp(48px, 7.4vw, 88px); line-height: 0.96; letter-spacing: -0.038em; font-weight: 500; margin: 24px 0 24px; text-wrap: balance; }
.hero h1 .dot { color: var(--signal); }
.hero p.lede { font-size: 17px; line-height: 1.5; color: var(--mist); max-width: 48ch; margin: 0 0 36px; text-wrap: pretty; }
.hero .ctas { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.hero.compact { padding: 64px 0 80px; }
.hero.compact .hero-inner { grid-template-columns: 1fr; }
.hero.compact h1 { font-size: clamp(40px, 5.6vw, 68px); }

/* Sections */
section.block { padding: 120px 0; border-top: 1px solid var(--rule-light); }
section.block.dark { border-top-color: var(--rule-dark); }
section.block .head { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; margin-bottom: 64px; }
section.block .head h2 { font-size: clamp(36px, 4.4vw, 56px); line-height: 1.05; letter-spacing: -0.025em; font-weight: 500; margin: 14px 0 0; text-wrap: balance; }
section.block .head h2 .accent { color: var(--signal); }
section.block .head .lede { font-size: 17px; line-height: 1.55; color: var(--graphite); margin: 0; max-width: 52ch; align-self: end; }
section.block.dark .head .lede { color: var(--mist); }
@media (max-width: 880px) {
  section.block .head { grid-template-columns: 1fr; gap: 24px; }
  .hero-inner { grid-template-columns: 1fr; }
  nav.top .inner { grid-template-columns: auto auto; gap: 16px; justify-content: space-between; }
  nav.top .links { display: none; }
  nav.top .actions .signin { display: none; }
  .menu-btn { display: flex; }
}

/* Feature grid */
.features { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; border: 1px solid var(--rule-light); border-radius: 12px; overflow: hidden; }
.feat { padding: 32px; border-right: 1px solid var(--rule-light); }
.feat:nth-child(4n) { border-right: 0; }
.feat .icon { width: 28px; height: 28px; color: var(--signal); margin-bottom: 18px; }
.feat h4 { margin: 0 0 6px; font-size: 17px; font-weight: 500; letter-spacing: -0.01em; }
.feat p { margin: 0; font-size: 14px; color: var(--graphite); line-height: 1.5; }
.dark .features { border-color: var(--rule-dark); }
.dark .feat { border-color: var(--rule-dark); }
.dark .feat p { color: var(--mist); }
@media (max-width: 880px) { .features { grid-template-columns: repeat(2, 1fr); } .feat:nth-child(2n) { border-right: 0; } }
@media (max-width: 480px)  { .features { grid-template-columns: 1fr; } .feat:nth-child(n) { border-right: 0; } }

.features.three { grid-template-columns: repeat(3, 1fr); }
.features.three .feat:nth-child(4n) { border-right: 1px solid var(--rule-light); }
.features.three .feat:nth-child(3n) { border-right: 0; }
.dark .features.three .feat:nth-child(4n) { border-right: 1px solid var(--rule-dark); }
.dark .features.three .feat:nth-child(3n) { border-right: 0; }

/* Two-up cards */
.twocol { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
@media (max-width: 880px) { .twocol { grid-template-columns: 1fr; } }
.usecase { border: 1px solid var(--rule-light); border-radius: 16px; padding: 36px; background: var(--paper); }
.dark .usecase { border-color: var(--rule-dark); background: var(--charcoal); }
.usecase .tag { font-family: var(--f-mono); font-size: 11px; color: var(--signal); letter-spacing: .12em; text-transform: uppercase; margin-bottom: 14px; }
.usecase h3 { font-size: 28px; line-height: 1.1; margin: 0 0 12px; font-weight: 500; letter-spacing: -0.02em; }
.usecase p { margin: 0 0 16px; color: var(--graphite); font-size: 14.5px; line-height: 1.55; }
.dark .usecase p { color: var(--mist); }

/* FAQ */
.faq { border-top: 1px solid var(--rule-light); }
.faq details { border-bottom: 1px solid var(--rule-light); padding: 24px 0; cursor: pointer; }
.faq summary { list-style: none; display: flex; justify-content: space-between; align-items: center; font-size: 18px; font-weight: 500; letter-spacing: -0.01em; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary .arrow { transition: transform .15s; color: var(--stone); }
.faq details[open] summary .arrow { transform: rotate(45deg); color: var(--signal); }
.faq details p { margin: 14px 0 0; color: var(--graphite); font-size: 15px; line-height: 1.6; max-width: 70ch; }

/* Final CTA */
.final { background: var(--ink); color: var(--bone); padding: 120px 0; text-align: center; position: relative; overflow: hidden; }
.final-inner { position: relative; }
.final h2 { font-size: clamp(40px, 6vw, 80px); letter-spacing: -0.035em; line-height: 1; font-weight: 500; margin: 0 0 20px; }
.final h2 .dot { color: var(--signal); }
.final p { color: var(--mist); font-size: 17px; max-width: 60ch; margin: 0 auto 32px; line-height: 1.55; }
.final .ctas { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* Waveform — prevent bars overflowing container */
.waveform { overflow: hidden; }

/* Footer */
footer.foot { background: var(--ink); color: var(--mist); padding: 64px 0 40px; border-top: 1px solid var(--rule-dark); }
footer.foot .row { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; }
@media (max-width: 880px) { footer.foot .row { grid-template-columns: 1fr 1fr; } }
@media (max-width: 480px)  { footer.foot .row { grid-template-columns: 1fr; } }
footer.foot h5 { font-family: var(--f-mono); font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--stone); margin: 0 0 18px; font-weight: 500; }
footer.foot ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; font-size: 14px; }
footer.foot a:hover { color: var(--bone); }
footer.foot .legal { margin-top: 56px; padding-top: 24px; border-top: 1px solid var(--rule-dark); display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; font-family: var(--f-mono); font-size: 11.5px; color: var(--stone); letter-spacing: 0.04em; }

/* Billing interval toggle */
.billing-toggle { display: flex; align-items: center; background: var(--paper-warm); border: 1px solid var(--rule-light); border-radius: 8px; padding: 4px; width: fit-content; margin: 0 0 48px; }
.billing-btn { display: flex; align-items: center; gap: 8px; padding: 7px 16px; border-radius: 5px; font-family: var(--f-sans); font-size: 13.5px; font-weight: 500; background: none; border: none; cursor: pointer; color: var(--stone); transition: background .12s, color .12s, box-shadow .12s; white-space: nowrap; line-height: 1.4; }
.billing-btn:hover { color: var(--ink); }
.billing-btn:focus-visible { outline: 2px solid var(--signal); outline-offset: 2px; }
.billing-btn--active { background: var(--paper); color: var(--ink); box-shadow: 0 1px 3px rgba(0,0,0,0.1), 0 0 0 1px rgba(0,0,0,0.04); }
.billing-save-badge { font-family: var(--f-mono); font-size: 10px; letter-spacing: 0.07em; text-transform: uppercase; background: var(--signal); color: white; padding: 2px 7px; border-radius: 3px; }

/* Annual note elements added below price in pricing cards */
.price-annual-note { display: flex; align-items: center; gap: 8px; margin-top: 8px; flex-wrap: wrap; }
.price-savings-badge { font-family: var(--f-mono); font-size: 10.5px; letter-spacing: 0.06em; text-transform: uppercase; background: #D1FAE5; color: var(--authentic); padding: 2px 8px; border-radius: 3px; }
.price-card.featured .price-savings-badge { background: rgba(52,211,153,0.18); color: #34D399; }
.price-billed-text { font-size: 12px; color: var(--stone); }
.price-card.featured .price-billed-text { color: var(--mist); }