/* Future Tech Club — styles.css */

:root {
  --bg: #0b0e14;
  --bg-elev: #10151f;
  --text: #e6e8ee;
  --muted: #9aa4b2;
  --primary: #3b82f6; /* blue-500 */
  --primary-600: #2563eb;
  --accent: #22c55e; /* green-500 */
  --card: #0f131b;
  --border: #1e2430;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f7f8fb;
    --bg-elev: #ffffff;
    --text: #0e1320;
    --muted: #475569;
    --primary: #2563eb;
    --primary-600: #1d4ed8;
    --accent: #16a34a;
    --card: #ffffff;
    --border: #e2e8f0;
  }
}

/* Theme override via data-theme attr */
html[data-theme="dark"] {
  --bg: #0b0e14;
  --bg-elev: #10151f;
  --text: #e6e8ee;
  --muted: #9aa4b2;
  --accent: #22c55e;
  --card: #0f131b;
  --border: #1e2430;
}
html[data-theme="light"] {
  --bg: #f7f8fb;
  --bg-elev: #ffffff;
  --text: #0e1320;
  --muted: #475569;
  --accent: #16a34a;
  --card: #ffffff;
  --border: #e2e8f0;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu,
    Cantarell, Noto Sans, Helvetica Neue, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  width: min(1100px, 92%);
  margin-inline: auto;
}

.skip-link {
  position: absolute; left: -9999px; top: auto; width: 1px; height: 1px; overflow: hidden;
}
.skip-link:focus { position: static; width: auto; height: auto; padding: .5rem 1rem; background: var(--accent); color: #00111a; border-radius: 8px; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: saturate(180%) blur(10px);
  background: color-mix(in oklab, var(--bg) 85%, transparent);
  border-bottom: 1px solid color-mix(in oklab, var(--border) 70%, transparent);
}
.header-inner { display: flex; align-items: center; gap: 1rem; padding: .75rem 0; }
.brand { display: inline-flex; align-items: center; gap: .6rem; font-weight: 700; color: var(--text); text-decoration: none; }
.brand-badge { display: inline-grid; place-items: center; width: 28px; height: 28px; border-radius: 6px; background: var(--text); color: var(--bg); font-size: .8rem; font-weight: 800; letter-spacing: .5px; }
.brand-text { letter-spacing: .2px; }

.nav { margin-left: auto; }
.nav-list { display: flex; gap: 1rem; list-style: none; padding: 0; margin: 0; }
.nav-list a { color: var(--muted); text-decoration: none; padding: .4rem .5rem; border-radius: 8px; }
.nav-list a:hover { color: var(--text); background: transparent; }

.nav-toggle { display: none; }
.icon-btn { border: 1px solid var(--border); background: var(--bg-elev); color: var(--text); border-radius: 8px; padding: .45rem .55rem; cursor: pointer; }
.icon-btn:hover { border-color: color-mix(in oklab, var(--border) 40%, var(--text)); }

/* Hero */
.hero { padding: 5rem 0 3rem; }
.hero h1 { font-size: clamp(1.75rem, 4.5vw, 3rem); line-height: 1.1; margin: 0 0 .5rem; }
.lede { font-size: clamp(1rem, 2vw, 1.125rem); color: var(--muted); max-width: 60ch; }
.actions { margin-top: 1.25rem; display: flex; gap: .6rem; flex-wrap: wrap; }

/* Sections */
.section { padding: 3.5rem 0; }
.section.alt { background: var(--bg-elev); border-block: 1px solid var(--border); }
.section h2 { font-size: clamp(1.5rem, 3vw, 2rem); margin: 0 0 1rem; }

.bullets { display: grid; gap: .4rem; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); padding: 0; margin: .75rem 0 0; list-style: none; }
.bullets li { position: relative; padding-left: 1rem; color: var(--muted); }
.bullets li::before { content: ""; position: absolute; left: 0; top: .6rem; width: .4rem; height: .4rem; border-radius: 50%; background: var(--primary); }

.cards { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.card { background: var(--bg-elev); border: 1px solid var(--border); border-radius: 12px; padding: 1rem; transition: border-color .15s ease, transform .15s ease; }
.card:hover { transform: translateY(-1px); border-color: color-mix(in oklab, var(--border) 40%, var(--text)); }
.card h3 { margin: .25rem 0 .5rem; font-size: 1.1rem; }
.card p { color: var(--muted); margin: 0; }

.event-list { display: grid; gap: .75rem; padding: 0; margin: 0; list-style: none; }
.event-list li { display: flex; justify-content: space-between; gap: 1rem; padding: .9rem 1rem; background: var(--bg-elev); border: 1px solid var(--border); border-radius: 10px; }
.event-title { font-weight: 600; }
.event-meta { color: var(--muted); }

/* Form */
.join-form { display: grid; gap: 1rem; max-width: 640px; }
.form-row { display: grid; gap: .4rem; }
label { font-weight: 600; }
input, select { background: var(--bg-elev); color: var(--text); border: 1px solid var(--border); border-radius: 12px; padding: .7rem .9rem; }
input:focus, select:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in oklab, var(--accent) 40%, transparent); }
.form-note { color: var(--muted); margin: 0; }

/* Buttons */
.btn { display: inline-block; border-radius: 10px; padding: .6rem .9rem; text-decoration: none; border: 1px solid var(--border); }
.btn.primary { background: var(--primary); color: white; border: 1px solid var(--primary-600); }
.btn.primary:hover { filter: brightness(1.05); }
.btn.outline { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn.outline:hover { border-color: color-mix(in oklab, var(--border) 40%, var(--text)); }

/* Footer */
.site-footer { border-top: 1px solid var(--border); padding: 2rem 0; background: var(--bg-elev); }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.footer-inner a { color: var(--muted); text-decoration: none; }
.footer-inner a:hover { color: var(--text); }
.social { list-style: none; display: flex; gap: .75rem; padding: 0; margin: 0; }

/* Mobile nav */
.nav-toggle { background: var(--bg-elev); border: 1px solid var(--border); border-radius: 10px; width: 40px; height: 40px; align-items: center; justify-content: center; }
.nav-toggle .bars { position: relative; width: 18px; height: 2px; background: var(--text); display: inline-block; }
.nav-toggle .bars::before, .nav-toggle .bars::after { content: ""; position: absolute; left: 0; width: 18px; height: 2px; background: var(--text); }
.nav-toggle .bars::before { top: -6px; }
.nav-toggle .bars::after { top: 6px; }

@media (max-width: 820px) {
  .nav-toggle { display: inline-flex; }
  .nav-list { position: absolute; right: .5rem; top: 58px; background: var(--bg-elev); border: 1px solid var(--border); border-radius: 12px; padding: .5rem; display: none; flex-direction: column; min-width: 180px; box-shadow: 0 10px 30px rgba(2,8,23,.25); }
  .nav-list.show { display: flex; }
}

/* Utilities */
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 8px; }
.hidden { display: none !important; }

/* Reduce animation when requested */
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}