/* =========================================================
   Placon.ai — base stylesheet
   Plain CSS, custom properties, dark theme default + light toggle.
   ========================================================= */

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html, body, h1, h2, h3, h4, p, ul, ol, figure { margin: 0; padding: 0; }
ul { list-style: none; }
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
button { font: inherit; cursor: pointer; }
input, textarea, select { font: inherit; }

/* ---------- Theme tokens ---------- */
:root {
  --bg: #090c12;
  --bg-alt: #0d1220;
  --surface: #10161f;
  --surface-2: #161e2c;
  --border: rgba(255, 255, 255, 0.08);
  --text: #e7edf5;
  --text-muted: #93a1b5;
  --accent: #14b8a6;
  --accent-strong: #2dd4bf;
  --accent-2: #22d3ee;
  --accent-3: #6366f1;
  --success: #22c55e;
  --danger: #f87171;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --shadow: 0 20px 60px -20px rgba(0, 0, 0, 0.6);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, "Helvetica Neue", Arial, sans-serif;
  color-scheme: dark;
}

html[data-theme="light"] {
  --bg: #f6f8fb;
  --bg-alt: #ffffff;
  --surface: #ffffff;
  --surface-2: #eef2f7;
  --border: rgba(15, 23, 42, 0.09);
  --text: #0f172a;
  --text-muted: #56637a;
  --accent: #0d9488;
  --accent-strong: #0f766e;
  --accent-2: #0891b2;
  --accent-3: #4f46e5;
  --shadow: 0 20px 50px -24px rgba(15, 23, 42, 0.25);
  color-scheme: light;
}

/* ---------- Base ---------- */
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background-color .25s ease, color .25s ease;
}

.container {
  width: 100%;
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 24px;
}

section { padding: 96px 0; }
@media (max-width: 720px) { section { padding: 64px 0; } }

h1, h2, h3, h4 { font-weight: 700; letter-spacing: -0.02em; line-height: 1.15; }
h1 { font-size: clamp(2.2rem, 5vw, 3.4rem); }
h2 { font-size: clamp(1.7rem, 3.4vw, 2.4rem); }
h3 { font-size: 1.25rem; }
p { color: var(--text-muted); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-strong);
  margin-bottom: 14px;
}
.eyebrow::before {
  content: "";
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 25%, transparent);
}

.section-head { max-width: 640px; margin: 0 auto 48px; text-align: center; }
.section-head p { margin-top: 14px; font-size: 1.05rem; }

.gradient-text {
  background: linear-gradient(90deg, var(--accent-strong), var(--accent-2) 55%, var(--accent-3));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.skip-link {
  position: absolute; left: -999px; top: auto;
  background: var(--accent); color: #04231f; padding: 10px 16px;
  border-radius: var(--radius-sm); z-index: 1000;
}
.skip-link:focus { left: 16px; top: 16px; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  transition: transform .15s ease, box-shadow .15s ease, background-color .15s ease, border-color .15s ease;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary {
  background: linear-gradient(135deg, var(--accent-strong), var(--accent-2));
  color: #04231f;
  box-shadow: 0 12px 30px -12px color-mix(in srgb, var(--accent) 70%, transparent);
}
.btn-primary:hover { box-shadow: 0 16px 36px -12px color-mix(in srgb, var(--accent) 80%, transparent); }
.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent-strong); }
.btn-block { width: 100%; }
.btn[disabled], .btn.is-disabled {
  opacity: 0.55; pointer-events: none;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  backdrop-filter: blur(14px);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 72px;
}
.wordmark { display: inline-flex; align-items: baseline; font-weight: 800; font-size: 1.3rem; }
.wordmark-mark {
  display: inline-flex; align-items: center; justify-content: center;
  width: 30px; height: 30px; margin-right: 2px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--accent-strong), var(--accent-2));
  color: #04231f;
  font-size: 1rem;
  transform: translateY(2px);
}
.wordmark-text { color: var(--text); }
.wordmark-tld { color: var(--accent-strong); font-weight: 700; }

.site-nav { display: flex; align-items: center; gap: 32px; }
.site-nav a { color: var(--text-muted); font-weight: 600; font-size: 0.95rem; position: relative; padding: 6px 0; }
.site-nav a:hover, .site-nav a.active { color: var(--text); }
.site-nav a.active::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -2px; height: 2px;
  background: var(--accent); border-radius: 2px;
}

.header-actions { display: flex; align-items: center; gap: 10px; }
.theme-toggle, .nav-toggle {
  display: inline-flex; align-items: center; justify-content: center;
  width: 40px; height: 40px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
}
.theme-toggle:hover, .nav-toggle:hover { border-color: var(--accent); }
.theme-toggle .icon { width: 18px; height: 18px; }
.theme-toggle .icon-moon { display: none; }
html[data-theme="light"] .theme-toggle .icon-sun { display: none; }
html[data-theme="light"] .theme-toggle .icon-moon { display: block; }

.nav-toggle { display: none; flex-direction: column; gap: 4px; }
.nav-toggle span { width: 18px; height: 2px; background: var(--text); border-radius: 2px; }

@media (max-width: 860px) {
  .nav-toggle { display: inline-flex; }
  .site-nav {
    position: absolute; top: 72px; left: 0; right: 0;
    flex-direction: column; align-items: flex-start; gap: 4px;
    background: var(--bg-alt); border-bottom: 1px solid var(--border);
    padding: 12px 24px 20px;
    max-height: 0; overflow: hidden; opacity: 0;
    transition: max-height .25s ease, opacity .2s ease;
  }
  .site-nav.is-open { max-height: 320px; opacity: 1; }
  .site-nav a { width: 100%; padding: 10px 0; }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: 120px 0 100px;
  overflow: hidden;
  isolation: isolate;
}
.hero::before {
  content: "";
  position: absolute; inset: -20% -10% auto -10%;
  height: 720px;
  background:
    radial-gradient(480px 320px at 18% 20%, color-mix(in srgb, var(--accent) 32%, transparent), transparent 70%),
    radial-gradient(420px 320px at 85% 10%, color-mix(in srgb, var(--accent-3) 28%, transparent), transparent 70%),
    radial-gradient(600px 400px at 50% 60%, color-mix(in srgb, var(--accent-2) 16%, transparent), transparent 70%);
  filter: blur(10px);
  z-index: -2;
}
.hero::after {
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 0%, black 40%, transparent 90%);
  z-index: -1;
  opacity: 0.6;
}
.hero-content { max-width: 760px; margin: 0 auto; text-align: center; }
.hero h1 { margin-bottom: 20px; }
.hero-sub { font-size: 1.15rem; max-width: 560px; margin: 0 auto 36px; }
.hero-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ---------- Cards / grids ---------- */
.grid { display: grid; gap: 24px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 900px) { .grid-3 { grid-template-columns: 1fr 1fr; } }
@media (max-width: 640px) { .grid-3, .grid-2 { grid-template-columns: 1fr; } }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 30px;
  box-shadow: var(--shadow);
  transition: transform .2s ease, border-color .2s ease;
}
.card:hover { transform: translateY(-3px); border-color: color-mix(in srgb, var(--accent) 40%, var(--border)); }
.card-icon {
  display: inline-flex; align-items: center; justify-content: center;
  width: 46px; height: 46px; border-radius: 12px;
  background: color-mix(in srgb, var(--accent) 16%, transparent);
  color: var(--accent-strong);
  margin-bottom: 18px;
  font-size: 1.3rem;
}
.card h3 { margin-bottom: 10px; }
.card p { margin: 0; font-size: 0.95rem; }

.badge {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 0.75rem; font-weight: 700; letter-spacing: 0.03em;
  padding: 5px 12px; border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 18%, transparent);
  color: var(--accent-strong);
}
.badge-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }

/* ---------- App showcase ---------- */
.app-showcase {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 56px;
  align-items: center;
}
@media (max-width: 900px) { .app-showcase { grid-template-columns: 1fr; } }

.feature-list { margin: 26px 0 32px; display: grid; gap: 16px; }
.feature-list li { display: flex; gap: 12px; align-items: flex-start; color: var(--text); font-weight: 500; }
.feature-list li svg { flex: none; width: 20px; height: 20px; margin-top: 2px; color: var(--accent-strong); }

.app-card {
  display: flex; align-items: center; gap: 16px;
  padding: 26px; margin-bottom: 16px;
}
.app-card-icon {
  width: 56px; height: 56px; border-radius: 16px; flex: none;
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 1.3rem; color: #04231f;
  background: linear-gradient(135deg, var(--accent-strong), var(--accent-2));
}
.app-card-body { flex: 1; }
.app-card-body h3 { margin-bottom: 4px; }
.app-card-meta { display: flex; align-items: center; gap: 10px; margin-top: 10px; flex-wrap: wrap; }

.app-card.is-placeholder {
  display: flex; align-items: center; justify-content: center;
  flex-direction: column; text-align: center; gap: 8px;
  border-style: dashed;
  color: var(--text-muted);
  min-height: 160px;
}

/* ---------- Phone mockup ---------- */
.phone-mockup {
  position: relative;
  width: 260px;
  margin: 0 auto;
  padding: 14px;
  border-radius: 40px;
  background: linear-gradient(160deg, var(--surface-2), var(--surface));
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.phone-mockup::before {
  content: "";
  position: absolute; top: 26px; left: 50%; transform: translateX(-50%);
  width: 70px; height: 6px; border-radius: 4px;
  background: var(--border);
}
.phone-mockup .phone-screen {
  border-radius: 26px;
  overflow: hidden;
  background: var(--bg-alt);
  aspect-ratio: 9 / 19.5;
  border: 1px solid var(--border);
}
.phone-mockup .phone-screen img {
  width: 100%; height: 100%; object-fit: cover;
}
.phone-mockup.phone-lg { width: 300px; }

.screenshot-gallery {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
@media (max-width: 900px) { .screenshot-gallery { grid-template-columns: repeat(2, 1fr); } }
.screenshot-gallery figcaption {
  text-align: center; margin-top: 14px; font-weight: 600; font-size: 0.9rem; color: var(--text-muted);
}

/* ---------- Feature rows (app detail page) ---------- */
.feature-row {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 56px;
  align-items: center;
}
.feature-row + .feature-row { margin-top: 88px; }
.feature-row.is-reversed { grid-template-columns: 1.1fr 0.9fr; }
.feature-row.is-reversed .feature-row-media { order: 2; }
@media (max-width: 900px) {
  .feature-row, .feature-row.is-reversed { grid-template-columns: 1fr; }
  .feature-row.is-reversed .feature-row-media { order: 0; }
}

/* ---------- Forms ---------- */
.form { display: grid; gap: 18px; }
.form-row { display: grid; gap: 18px; grid-template-columns: 1fr 1fr; }
@media (max-width: 640px) { .form-row { grid-template-columns: 1fr; } }
.field { display: grid; gap: 8px; }
.field label { font-weight: 600; font-size: 0.9rem; }
.field input, .field select, .field textarea {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  width: 100%;
  transition: border-color .15s ease;
}
.field input:focus, .field select:focus, .field textarea:focus {
  border-color: var(--accent);
}
.field textarea { min-height: 140px; resize: vertical; }
.field-hint { font-size: 0.8rem; color: var(--text-muted); }
.honeypot-field { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.field input.is-invalid, .field select.is-invalid, .field textarea.is-invalid { border-color: var(--danger); }

.form-note {
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.92rem;
  margin-bottom: 20px;
}
.form-note.is-success { background: color-mix(in srgb, var(--success) 16%, transparent); color: var(--success); }
.form-note.is-error { background: color-mix(in srgb, var(--danger) 16%, transparent); color: var(--danger); }

.notify-card {
  text-align: center;
  padding: 56px 32px;
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, var(--surface), var(--surface-2));
  border: 1px solid var(--border);
}
.notify-card .form { max-width: 420px; margin: 24px auto 0; grid-template-columns: 1fr auto; grid-auto-flow: column; align-items: start; }
.notify-card .field { flex: 1; }
@media (max-width: 560px) { .notify-card .form { grid-template-columns: 1fr; grid-auto-flow: row; } }

/* ---------- Prose (about/legal pages) ---------- */
.prose { max-width: 760px; margin: 0 auto; }
.prose h2 { margin-top: 44px; margin-bottom: 14px; }
.prose h2:first-child { margin-top: 0; }
.prose p { margin-bottom: 16px; }
.prose ul { margin: 0 0 16px; display: grid; gap: 10px; }
.prose ul li { padding-left: 22px; position: relative; color: var(--text-muted); }
.prose ul li::before {
  content: ""; position: absolute; left: 0; top: 9px;
  width: 6px; height: 6px; border-radius: 50%; background: var(--accent);
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-alt);
  padding-top: 64px;
}
.footer-inner {
  display: flex; justify-content: space-between; gap: 48px; flex-wrap: wrap;
  padding-bottom: 48px;
}
.footer-brand { max-width: 280px; }
.footer-tagline { margin-top: 14px; font-size: 0.95rem; }
.footer-links { display: flex; gap: 56px; flex-wrap: wrap; }
.footer-col { display: grid; gap: 12px; }
.footer-col h4 { color: var(--text); font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 4px; }
.footer-col a { color: var(--text-muted); font-size: 0.95rem; }
.footer-col a:hover { color: var(--accent-strong); }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 22px 24px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ---------- 404 ---------- */
.error-page { text-align: center; padding: 140px 0; }
.error-code {
  font-size: clamp(4rem, 12vw, 7rem);
  font-weight: 800;
  margin-bottom: 8px;
}

/* ---------- Reveal-on-scroll ---------- */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity .5s ease, transform .5s ease; }
.reveal.is-visible { opacity: 1; transform: translateY(0); }