/* Base */
:root {
  --bg: #0b0c0f;
  --text: #f7f7f2;
  --muted: #b6b9c3;
  --card: #14161b;
  --brand: #5b8cff;
  --brand-800: #3a63d1;
  --accent: #00d1b2;
  --shadow: 0 10px 30px rgba(0,0,0,0.35);
}

/* Explicit theme tokens via data-theme */
html[data-theme="light"] {
  --bg: #f7f7f2; /* off-white */
  --text: #111418;
  --muted: #5a6270;
  --card: #ffffff;
  --brand: #0a3d62; /* marine blue */
  --brand-800: #062a45; /* deeper marine */
  --accent: #0fb;
  --shadow: 0 10px 30px rgba(0,0,0,0.08);
}
html[data-theme="dark"] {
  --bg: #0b0c0f;
  --text: #f7f7f2;
  --muted: #b6b9c3;
  --card: #14161b;
  --brand: #5b8cff;
  --brand-800: #3a63d1;
  --accent: #00d1b2;
  --shadow: 0 10px 30px rgba(0,0,0,0.35);
}

html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  background: radial-gradient(1200px 800px at 20% -10%, rgba(91,140,255,0.15), transparent 60%),
              radial-gradient(900px 600px at 100% 10%, rgba(0,209,178,0.12), transparent 50%),
              var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.container { width: min(1120px, 100%); margin-inline: auto; padding: 0 20px; }
.section { padding: 64px 0; }

/* Header */
.site-header { position: sticky; top: 0; z-index: 50; backdrop-filter: blur(8px); background: color-mix(in oklab, var(--bg) 85%, transparent); border-bottom: 1px solid color-mix(in srgb, var(--text) 10%, transparent); }
.nav { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 14px 20px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 700; letter-spacing: 0.2px; }
.brand img { filter: drop-shadow(0 2px 6px rgba(0,0,0,0.3)); }
.nav-list { display: flex; align-items: center; gap: 18px; list-style: none; margin: 0; padding: 0; }
.nav-list a { color: var(--text); text-decoration: none; opacity: 0.9; }
.nav-list a:hover, .nav-list a:focus { opacity: 1; text-decoration: underline; text-underline-offset: 4px; }
.nav-toggle { display: none; background: none; border: 1px solid color-mix(in srgb, var(--text) 15%, transparent); border-radius: 8px; color: var(--text); font-size: 20px; padding: 6px 10px; }
.theme-toggle { background: none; border: 1px solid color-mix(in srgb, var(--text) 15%, transparent); border-radius: 8px; color: var(--text); font-size: 16px; padding: 6px 10px; cursor: pointer; }
.lang-switch { display: flex; gap: 6px; }
.lang { background: none; border: 1px solid color-mix(in srgb, var(--text) 15%, transparent); color: var(--text); padding: 6px 10px; border-radius: 8px; cursor: pointer; }
.lang[aria-pressed="true"] { background: color-mix(in srgb, var(--brand) 20%, transparent); border-color: color-mix(in srgb, var(--brand) 60%, transparent); }

/* Hero */
.hero { padding: 72px 0 32px; text-align: center; }
.hero h1 { font-size: clamp(28px, 4vw, 44px); line-height: 1.12; margin: 0 0 10px; }
.subtitle { margin: 0 auto; max-width: 60ch; color: var(--muted); }
.cta { display: flex; justify-content: center; gap: 12px; margin-top: 22px; flex-wrap: wrap; }

/* Cards */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
@media (max-width: 900px) { .cards { grid-template-columns: 1fr 1fr; } }
@media (max-width: 640px) { .cards { grid-template-columns: 1fr; } }
.card { background: var(--card); border: 1px solid color-mix(in srgb, var(--text) 10%, transparent); border-radius: 16px; padding: 18px 18px; box-shadow: var(--shadow); }
.card h3 { margin: 0 0 8px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); }

/* Typography */
h2 { font-size: 24px; margin: 0 0 18px; }
p { margin: 0 0 10px; }

/* Buttons */
.button { appearance: none; display: inline-flex; align-items: center; justify-content: center; gap: 8px; text-decoration: none; color: var(--text); border: 1px solid color-mix(in srgb, var(--text) 15%, transparent); background: transparent; padding: 10px 14px; border-radius: 12px; transition: background 0.2s ease, transform 0.08s ease; }
.button:hover { background: color-mix(in srgb, var(--text) 8%, transparent); }
.button:active { transform: translateY(1px); }
.button.primary { background: linear-gradient(180deg, var(--brand), var(--brand-800)); border: none; color: white; }
.button.primary:hover { filter: brightness(1.05); }

/* Contact */
.contact-links { display: flex; gap: 12px; flex-wrap: wrap; }

/* Contact form */
.contact-form { margin-top: 18px; background: var(--card); border: 1px solid color-mix(in srgb, var(--text) 10%, transparent); border-radius: 16px; padding: 18px; box-shadow: var(--shadow); max-width: 720px; }
.form-row { display: flex; flex-direction: column; gap: 6px; margin-bottom: 12px; }
.form-row label { font-weight: 600; }
.form-row input, .form-row textarea { color: var(--text); background: color-mix(in srgb, var(--bg) 85%, white 15%); border: 1px solid color-mix(in srgb, var(--text) 15%, transparent); border-radius: 10px; padding: 10px 12px; font: inherit; }
.form-row input::placeholder, .form-row textarea::placeholder { color: color-mix(in srgb, var(--text) 45%, transparent); }
.form-row input:focus-visible, .form-row textarea:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.form-actions { display: flex; align-items: center; gap: 12px; }
.form-status { color: var(--muted); }

/* Footer */
.site-footer { padding: 36px 20px; text-align: center; color: var(--muted); border-top: 1px solid color-mix(in srgb, var(--text) 10%, transparent); margin-top: 40px; }

/* Responsive nav */
@media (max-width: 760px) {
  .nav-toggle { display: inline-block; }
  .nav-list { position: absolute; top: 58px; right: 12px; background: var(--card); border: 1px solid color-mix(in srgb, var(--text) 10%, transparent); border-radius: 14px; padding: 8px 12px; box-shadow: var(--shadow); display: none; flex-direction: column; min-width: 180px; }
  .nav-list.open { display: flex; }
}

/* Focus styles */
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 8px; }