/* =============================================================================
   gias.dev landing page
   Hand-rolled, dependency-free CSS. Dark-first (matches the Gias app's
   Tokyo-Night palette), with a light variant via prefers-color-scheme.
   ============================================================================= */

:root {
  --bg: #0b0e14;
  --bg-elev: #0e1320;
  --bg-elev-2: #121829;
  --border: #1c2230;
  --border-strong: #2a3346;
  --text: #c3ccdc;
  --text-dim: #8a93a6;
  --text-bright: #eef2fb;
  --accent: #7aa2f7;
  --accent-hover: #94b4ff;
  --accent-ink: #0b0e14;
  --radius: 14px;
  --maxw: 1080px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: "Cascadia Code", "SF Mono", Consolas, ui-monospace, monospace;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f6f8fc;
    --bg-elev: #ffffff;
    --bg-elev-2: #eef2f9;
    --border: #dde3ee;
    --border-strong: #c6cfde;
    --text: #384252;
    --text-dim: #667085;
    --text-bright: #10131a;
    --accent: #3b5bdb;
    --accent-hover: #2f4bc0;
    --accent-ink: #ffffff;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

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

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}

/* ---- Buttons ------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  border-radius: 10px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.05s ease;
  text-decoration: none;
  line-height: 1;
  white-space: nowrap;
}
.btn:hover { text-decoration: none; }
.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--accent);
  color: var(--accent-ink);
  padding: 14px 26px;
}
.btn-primary:hover { background: var(--accent-hover); color: var(--accent-ink); }

.btn-ghost {
  background: transparent;
  color: var(--text-bright);
  border-color: var(--border-strong);
  padding: 9px 16px;
}
.btn-ghost:hover { background: var(--bg-elev-2); color: var(--text-bright); }

.btn-lg { font-size: 18px; padding: 16px 32px; }
.btn-sm { font-size: 14px; }

/* ---- Header -------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 62px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text-bright);
  font-weight: 700;
  font-size: 18px;
}
.brand:hover { text-decoration: none; color: var(--text-bright); }
.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px; height: 30px;
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-ink);
  font-family: var(--mono);
  font-weight: 700;
  font-size: 17px;
}
.brand-name { letter-spacing: -0.01em; }

/* ---- Hero ---------------------------------------------------------------- */
.hero { padding: 84px 0 40px; }
.hero-inner { text-align: center; }
.hero-title {
  font-size: clamp(2.2rem, 6vw, 4rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin: 0 auto;
  max-width: 16ch;
  color: var(--text-bright);
  font-weight: 800;
}
.hero-sub {
  margin: 22px auto 0;
  max-width: 60ch;
  font-size: clamp(1.05rem, 2.2vw, 1.28rem);
  color: var(--text-dim);
}
.cta-row {
  margin-top: 34px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 14px;
}
.cta-meta { color: var(--text-dim); font-size: 14px; }
.cta-note {
  margin: 12px auto 0;
  max-width: 48ch;
  font-size: 14px;
  color: var(--text-dim);
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 14px;
}

/* ---- Asset placeholders -------------------------------------------------- */
.asset-slot {
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1.5px dashed var(--border-strong);
  border-radius: var(--radius);
  background:
    repeating-linear-gradient(
      -45deg,
      transparent, transparent 12px,
      color-mix(in srgb, var(--border) 45%, transparent) 12px,
      color-mix(in srgb, var(--border) 45%, transparent) 13px
    ),
    var(--bg-elev);
  color: var(--text-dim);
  text-align: center;
  overflow: hidden;
}
.asset-slot img,
.asset-slot video {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius);
}
.asset-label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 24px;
}
.asset-label strong {
  color: var(--text-bright);
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: 0.04em;
}
.asset-label span { font-size: 14px; }
.asset-dims {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text-dim);
  opacity: 0.8;
}
.asset-hero {
  margin: 52px auto 0;
  max-width: 960px;
  aspect-ratio: 1200 / 750;
}
.asset-feature {
  flex: 1 1 0;
  min-width: 0;
  aspect-ratio: 1000 / 640;
}

/* ---- What is Gias -------------------------------------------------------- */
.what { padding: 70px 24px; }
.what-line {
  max-width: 62ch;
  margin: 0 auto;
  text-align: center;
  font-size: clamp(1.1rem, 2.4vw, 1.4rem);
  line-height: 1.55;
  color: var(--text);
}
.what-line strong { color: var(--text-bright); }

/* ---- Features ------------------------------------------------------------ */
.feature {
  display: flex;
  align-items: center;
  gap: 56px;
  padding: 56px 24px;
}
.feature-reverse { flex-direction: row-reverse; }
.feature-copy { flex: 1 1 0; min-width: 0; }
.feature-kicker {
  display: inline-block;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}
.feature-title {
  font-size: clamp(1.6rem, 3.6vw, 2.4rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 0 0 16px;
  color: var(--text-bright);
  font-weight: 750;
}
.feature-text {
  margin: 0;
  font-size: 1.12rem;
  color: var(--text-dim);
  max-width: 46ch;
}

/* ---- Closer + signup ----------------------------------------------------- */
.closer { padding: 40px 24px 20px; }
.closer-cta {
  text-align: center;
  padding: 48px 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elev);
}
.closer-title {
  font-size: clamp(1.5rem, 3.4vw, 2.1rem);
  letter-spacing: -0.02em;
  margin: 0 0 26px;
  color: var(--text-bright);
}
.closer-cta .cta-meta { display: block; margin-top: 14px; }

.signup {
  margin: 46px auto 0;
  max-width: 560px;
  text-align: center;
}
.signup-title {
  font-size: 1.35rem;
  margin: 0 0 8px;
  color: var(--text-bright);
}
.signup-sub {
  margin: 0 0 22px;
  color: var(--text-dim);
  font-size: 1rem;
}
.signup-form {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
}
.signup-form input[type="email"] {
  flex: 1 1 260px;
  min-width: 0;
  padding: 14px 16px;
  font-size: 16px;
  color: var(--text-bright);
  background: var(--bg-elev);
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  font-family: inherit;
}
.signup-form input[type="email"]::placeholder { color: var(--text-dim); }
.signup-form input[type="email"]:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 25%, transparent);
}
.signup-form .btn { flex: 0 0 auto; }
.signup-msg {
  margin: 16px auto 0;
  font-size: 14px;
  color: var(--text-dim);
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 14px;
  max-width: 48ch;
}
.signup-msg.is-ok { color: var(--text-bright); border-color: var(--accent); }

/* ---- Footer -------------------------------------------------------------- */
.site-footer {
  margin-top: 60px;
  border-top: 1px solid var(--border);
  padding: 34px 0;
}
.footer-inner {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: space-between;
}
.footer-brand {
  font-weight: 700;
  color: var(--text-bright);
  font-size: 17px;
}
.footer-line { margin: 0; color: var(--text-dim); font-size: 15px; }

/* ---- Responsive ---------------------------------------------------------- */
@media (max-width: 760px) {
  body { font-size: 16px; }
  .hero { padding: 56px 0 24px; }
  .feature, .feature-reverse {
    flex-direction: column;
    gap: 28px;
    padding: 40px 24px;
  }
  .feature-text { max-width: none; }
  .asset-feature { width: 100%; }
  .footer-inner { justify-content: center; text-align: center; }
}