/* ================= Root & Theme Tokens ================= */
:root {
  --container: 1200px;
  --radius: 16px;
  --shadow: 0 10px 30px rgba(2,6,23,0.10);
  --transition: 180ms cubic-bezier(.2,.6,.2,1);

  /* Gradients */
  --grad-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --grad-accent: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);

  /* Light theme */
  --bg: #EEF1F5;
  --surface: #FFFFFF;
  --muted: #E9EDF3;
  --text: #1E293B;
  --text-2: #334155;
  --text-muted: #64748B;
  --border: rgba(15,23,42,.08);
}

html[data-theme="dark"] {
  --bg: #0E1116;
  --surface: #12161F;
  --muted: #171C26;
  --text: #FFFFFF;
  --text-2: #C7CBD6;
  --text-muted: #9AA3B2;
  --border: rgba(255,255,255,.08);
}

/* ================= Base ================= */
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: 'Inter', ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}
.container { width: min(92%, var(--container)); margin-inline: auto; }

/* Glass utility */
.glass {
  background: color-mix(in hsl, var(--surface) 80%, transparent);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

a {
  text-decoration: none;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.btn { display: inline-flex; align-items: center; gap: .6rem; padding: .85rem 1.1rem; border-radius: 999px; text-decoration: none; font-weight: 600; transition: transform var(--transition), box-shadow var(--transition), background var(--transition); }
.btn-primary { background: var(--grad-primary); color: #fff; box-shadow: 0 6px 20px rgba(102,126,234,.35); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 24px rgba(102,126,234,.45); }
.btn-ghost { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn-ghost:hover { background: var(--muted); }

/* ================= Navbar ================= */
.nav { position: sticky; top: 0; z-index: 50; }
.nav-inner { display: flex; align-items: center; justify-content: space-between; padding: .75rem 0; }
.logo { display: inline-flex; align-items: center; gap: .6rem; font-weight: 800; color: var(--text); text-decoration: none; }
.logo img { border-radius: 8px; }

.main-nav { display: flex; align-items: center; gap: 1.2rem; }
.main-nav a { color: var(--text-2); text-decoration: none; padding: .5rem .75rem; border-radius: 10px; transition: background var(--transition), color var(--transition); }
.main-nav a:hover { background: var(--muted); color: var(--text); }

.nav-right { display: inline-flex; align-items: center; gap: .75rem; margin-left: .5rem; }
.lang-switch button { padding: .4rem .6rem; border-radius: 10px; border: 1px solid var(--border); background: transparent; color: var(--text-2); cursor: pointer; }
.lang-switch button:hover { background: var(--muted); color: var(--text); }

.theme-switcher { position: relative; width: 54px; height: 28px; border-radius: 999px; border: 1px solid var(--border); background: var(--surface); cursor: pointer; display: inline-flex; align-items: center; justify-content: space-between; padding: 0 6px; }
.theme-switcher .knob { position: absolute; left: 4px; width: 22px; height: 22px; border-radius: 50%; background: var(--grad-primary); transition: transform var(--transition); box-shadow: 0 4px 12px rgba(0,0,0,.25); }
html[data-theme="light"] .theme-switcher .knob { transform: translateX(0); }
html[data-theme="dark"] .theme-switcher .knob { transform: translateX(24px); }
.theme-switcher .moon, .theme-switcher .sun { font-size: 12px; opacity: .8; }

/* Mobile nav toggle */
.nav-toggle { display: none; width: 44px; height: 44px; border-radius: 12px; border: 1px solid var(--border); background: var(--surface); align-items: center; justify-content: center; gap: 4px; }
.nav-toggle span { display: block; width: 20px; height: 2px; background: var(--text); }

@media (max-width: 900px) {
  .nav-toggle { display: inline-flex; }
  .main-nav { position: fixed; inset: 64px 0 auto 0; transform: translateY(-8px); opacity: 0; pointer-events: none; flex-direction: column; align-items: stretch; gap: .25rem; margin: 0 auto; width: min(92%, 720px); padding: .75rem; background: color-mix(in hsl, var(--surface) 92%, transparent); border: 1px solid var(--border); border-radius: 14px; box-shadow: var(--shadow); }
  .main-nav.open { opacity: 1; transform: translateY(0); pointer-events: auto; }
  .nav-right { justify-content: space-between; }
}

/* ================= Hero ================= */
.hero { position: relative; padding: clamp(4rem, 8vw, 8rem) 0; isolation: isolate; }
.hero::before { content: ""; position: absolute; inset: 0; background:
  radial-gradient(1200px 600px at 20% 20%, rgba(120,119,198,.18), transparent 60%),
  radial-gradient(1000px 600px at 80% 10%, rgba(255,118,117,.18), transparent 60%),
  radial-gradient(1000px 600px at 50% 90%, rgba(72,187,120,.18), transparent 60%);
  z-index: -1;
}
.hero-content { text-align: center; }
.hero h1 { font-size: clamp(2rem, 4vw, 3rem); line-height: 1.1; margin: 0 0 .75rem; }
.hero p { color: var(--text-2); max-width: 60ch; margin: 0 auto 1.25rem; }
.hero-ctas { display: inline-flex; gap: .75rem; flex-wrap: wrap; }

/* ================= About ================= */
.about { padding: clamp(3rem, 6vw, 5rem) 0; }
.about-grid { display: grid; grid-template-columns: 1.2fr 1fr; gap: 2rem; align-items: center; }
.about-image img { width: 100%; height: 100%; object-fit: cover; border-radius: var(--radius); box-shadow: var(--shadow); }
.about-text { padding: 2rem; }
.about-text h2 { margin-top: 0; }

@media (max-width: 900px) {
  .about-grid { grid-template-columns: 1fr; }
}

/* ================= Pillars ================= */
.pillars { padding: clamp(3rem, 6vw, 5rem) 0; }
.pillars-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.2rem; }
.pillar { overflow: hidden; display: grid; grid-template-rows: 160px 1fr; }
.pillar-media { background-image: var(--bg); background-image: var(--bg), var(--bg-gradient); background: center/cover no-repeat var(--bg, #000); background-image: var(--bg, #000); background: center/cover no-repeat var(--bg);
  background-image: var(--bg); background: center/cover no-repeat; }
.pillar { --bg: var(--bg); }
.pillar[style] .pillar-media { background-image: var(--bg); }
.pillar-content { padding: 1.1rem 1.1rem 1.2rem; }
.pillar h3 { margin-top: .2rem; margin-bottom: .4rem; font-size: 1.15rem; }
.pillar ul { margin: .5rem 0 0; padding-left: 1.1rem; color: var(--text-2); }
.pillar li { margin: .2rem 0; }
.stretch-link { position: absolute; inset: 0; z-index: 1; }

@media (max-width: 1100px) {
  .pillars-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 700px) {
  .pillars-grid { grid-template-columns: 1fr; }
}

/* ================= Impact ================= */
.impact { padding: clamp(3rem, 6vw, 5rem) 0; }
.impact h2 { text-align: center; margin-bottom: 1.4rem; }
.numbers { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; }
.stat { text-align: center; padding: 1.2rem; }
.stat strong { display: block; font-size: clamp(1.6rem, 4vw, 2.2rem); background: var(--grad-accent); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat span { color: var(--text-muted); font-weight: 600; }

@media (max-width: 900px) { .numbers { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .numbers { grid-template-columns: 1fr; } }

/* ================= Join ================= */
.join { padding: clamp(3rem, 6vw, 5rem) 0; }
.join-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: 1.2rem; align-items: start; }
.join-text p { color: var(--text-2); }
.contact-form { display: grid; gap: .8rem; padding: 1.2rem; }
.contact-form input, .contact-form textarea { width: 100%; padding: .9rem 1rem; border-radius: 12px; border: 1px solid var(--border); background: color-mix(in hsl, var(--surface) 90%, transparent); color: var(--text); }
.contact-form input:focus, .contact-form textarea:focus { outline: none; box-shadow: 0 0 0 3px rgba(102,126,234,.2); }

@media (max-width: 900px) { .join-grid { grid-template-columns: 1fr; } }

/* ================= Footer ================= */
.footer { padding: 1rem 0; border-top: 1px solid var(--border); color: var(--text-muted); }
.footer p { margin: 0; text-align: center; }

/* ================= Reveal ================= */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }