/*
  NIS IT Club — Styles
  Theme: Blue / White / Green
*/

:root {
  --blue-50: #eff6ff;
  --blue-100: #dbeafe;
  --blue-600: #2563eb;      /* base */
  --blue-700: #1d4ed8;      /* accent */
  --blue-800: #1e40af;      /* darker */
  --blue-900: #1e3a8a;      /* much darker */
  --blue-950: #0a2472;      /* deepest accent */
  --green-500: #22c55e;
  --green-600: #16a34a;
  --green-700: #15803d;
  --slate-25: #f8fafc;
  --slate-50: #f1f5f9;
  --slate-100: #e2e8f0;
  --slate-300: #cbd5e1;
  --slate-600: #475569;
  --slate-700: #334155;
  --slate-900: #0f172a;
  --white: #ffffff;
  --header-bg: rgba(255,255,255,.75);
  --border-soft: rgba(15,23,42,.06);

  --radius: 14px;
  --radius-sm: 10px;
  --shadow-1: 0 8px 24px rgba(2,6,23,.08);
  --shadow-2: 0 14px 40px rgba(2,6,23,.14);
}

[data-theme="dark"] {
  --blue-50: #0b1220;
  --blue-100: #0f1a2e;
  --blue-600: #2563eb;
  --blue-700: #1d4ed8;
  --blue-800: #1e40af;
  --blue-900: #1e3a8a;
  --blue-950: #0a2472;
  --green-500: #22c55e;
  --green-600: #16a34a;
  --green-700: #15803d;
  --slate-25: #0b1220;
  --slate-50: #0f172a;
  --slate-100: #1e293b;
  --slate-300: #334155;
  --slate-600: #94a3b8;
  --slate-700: #cbd5e1;
  --slate-900: #e2e8f0;
  --white: #0f172a;
  --header-bg: rgba(2,6,23,.6);
  --border-soft: rgba(148,163,184,.14);
  --shadow-1: 0 8px 24px rgba(2,6,23,.4);
  --shadow-2: 0 14px 40px rgba(2,6,23,.5);
}

* { box-sizing: border-box; }
html { color-scheme: light dark; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, Arial, sans-serif;
  color: var(--slate-900);
  background: var(--slate-25);
  line-height: 1.6;
}

img { max-width: 100%; display: block; }

.container {
  width: min(1120px, 92%);
  margin-inline: auto;
}

h1, h2, h3 {
  line-height: 1.2;
  margin: 0 0 .6rem;
}
h1 { font-family: Poppins, Inter, ui-sans-serif, system-ui; font-weight: 800; font-size: clamp(2rem, 3vw + 1.5rem, 3.2rem); }
h2 { font-weight: 800; font-size: clamp(1.5rem, 1.2vw + 1.2rem, 2rem); }
h3 { font-weight: 700; font-size: 1.1rem; }

p { margin: 0 0 1rem; color: var(--slate-700); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .6rem;
  background: linear-gradient(135deg, var(--blue-800), var(--green-600));
  color: var(--white);
  text-decoration: none;
  padding: .8rem 1.1rem;
  border-radius: 12px;
  font-weight: 600;
  box-shadow: var(--shadow-1);
  transition: transform .15s ease, box-shadow .15s ease, opacity .2s ease, background-position .25s ease;
  background-size: 140% 140%;
}
.btn:hover { transform: translateY(-1px); box-shadow: var(--shadow-2); background-position: 20% 80%; }
.btn:active { transform: translateY(0); }
.btn--ghost {
  background: transparent;
  color: var(--blue-900);
  border: 2px solid var(--blue-100);
  backdrop-filter: blur(6px);
}
.btn--small { padding: .5rem .8rem; border-radius: 10px; }

.pill {
  display: inline-block;
  padding: .25rem .6rem;
  border-radius: 999px;
  font-size: .8rem;
  font-weight: 600;
  background: var(--slate-50);
  color: var(--slate-700);
  border: 1px solid var(--slate-100);
}
.pill--blue { color: var(--blue-900); background: #eef2ff; border-color: #e0e7ff; }
.pill--green { color: var(--green-700); background: #ecfdf5; border-color: #d1fae5; }

/* Badges */
.badge { display: inline-block; font-weight: 700; font-size: .72rem; letter-spacing: .3px; padding: .2rem .5rem; border-radius: 999px; border: 1px solid var(--slate-100); }
.badge--workshop { background: #eef2ff; color: var(--blue-900); border-color: #dbeafe; }
.badge--competition { background: #ecfdf5; color: var(--green-700); border-color: #bbf7d0; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: var(--header-bg);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-soft);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  padding: .6rem 0;
}
.brand { display: inline-flex; align-items: center; gap: .8rem; text-decoration: none; color: inherit; }
.brand-text { display: grid; }
.brand .club { font-weight: 800; letter-spacing: .2px; }
.brand .school { font-size: .85rem; color: var(--slate-600); }

.site-nav { display: flex; align-items: center; gap: 1rem; }
.site-nav a { color: var(--slate-700); text-decoration: none; font-weight: 600; padding: .4rem .6rem; border-radius: 8px; position: relative; }
.site-nav a::after { content: ""; position: absolute; left: .6rem; right: .6rem; bottom: .2rem; height: 2px; background: linear-gradient(90deg, var(--blue-900), var(--green-600)); transform: scaleX(0); transform-origin: left; transition: transform .2s ease; border-radius: 2px; }
.site-nav a:hover { color: var(--blue-900); background: var(--blue-50); }
.site-nav a:hover::after { transform: scaleX(1); }

/* Theme toggle */
.theme-toggle { display: inline-grid; place-items: center; width: 40px; height: 40px; border-radius: 12px; border: 1px solid var(--slate-100); background: var(--white); color: var(--slate-900); margin-right: .4rem; cursor: pointer; transition: transform .15s ease, box-shadow .15s ease; }
.theme-toggle:hover { transform: translateY(-1px); box-shadow: var(--shadow-1); }
.theme-toggle .icon { display: block; }
[data-theme="light"] .icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: none; }

.nav-toggle { display: none; background: none; border: 0; padding: .4rem; border-radius: 10px; }
.nav-toggle { width: 40px; height: 40px; display: none; place-items: center; }
.nav-toggle .bar { display: block; width: 24px; height: 2px; background: var(--slate-900); margin: 4px 0; transition: transform .2s ease, opacity .2s ease; }
.site-header.open .nav-toggle .bar:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.site-header.open .nav-toggle .bar:nth-child(2) { opacity: 0; }
.site-header.open .nav-toggle .bar:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* Hero */
.hero {
  position: relative;
  background:
    radial-gradient(1200px 600px at -10% -10%, rgba(30,58,138,.22), transparent 65%),
    radial-gradient(1000px 500px at 110% -20%, rgba(22,163,74,.18), transparent 65%),
    linear-gradient(180deg, #ffffff, #f8fafc 40%);
}
[data-theme="dark"] .hero {
  background:
    radial-gradient(1200px 600px at -10% -10%, rgba(37,99,235,.20), transparent 65%),
    radial-gradient(1000px 500px at 110% -20%, rgba(34,197,94,.15), transparent 65%),
    linear-gradient(180deg, #0f172a, #0b1220 40%);
}
.hero-inner { display: grid; grid-template-columns: 1.2fr 1fr; gap: 2rem; align-items: center; padding: 3rem 0 2rem; }
.eyebrow { display: inline-block; font-size: .95rem; letter-spacing: .3px; color: var(--blue-900); background: #e7efff; border: 1px solid #dbeafe; padding: .25rem .6rem; border-radius: 999px; margin-bottom: .6rem; }
.hero p { font-size: 1.05rem; }
.hero-ctas { display: flex; gap: .8rem; margin-top: 1rem; flex-wrap: wrap; }

.hero-art { display: grid; place-items: center; }
.hero-art img { width: 100%; max-width: 520px; filter: drop-shadow(0 30px 40px rgba(2,6,23,.12)); }
@media (prefers-reduced-motion: no-preference) {
  .hero-art img { animation: floaty 7s ease-in-out infinite; }
}
@keyframes floaty {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.hero-wave { position: absolute; inset-inline: 0; bottom: -1px; color: var(--slate-25); }
.hero-wave svg { display: block; width: 100%; height: 80px; }
.hero-wave path { fill: var(--slate-25); }

/* Sections */
.section { padding: 3.2rem 0; }
.section--alt { background: var(--white); }
.section-head { text-align: center; margin-bottom: 1.8rem; }
.section-head p { max-width: 720px; margin-inline: auto; }

.card-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; }
.card {
  background: var(--white);
  border: 1px solid var(--slate-100);
  border-radius: var(--radius);
  padding: 1.1rem;
  box-shadow: var(--shadow-1);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-2); border-color: #e5edff; }
.card-icon { width: 46px; height: 46px; display: grid; place-items: center; font-weight: 800; color: var(--blue-700); background: #eef2ff; border: 1px solid #e0e7ff; border-radius: 12px; margin-bottom: .7rem; }

.split { display: grid; grid-template-columns: 1.2fr .8fr; gap: 2rem; align-items: start; }
.checklist { list-style: none; padding: 0; margin: 1rem 0 1.2rem; }
.checklist li { position: relative; padding-left: 1.6rem; margin: .4rem 0; }
.checklist li::before { content: ""; position: absolute; left: 0; top: .35rem; width: 1rem; height: 1rem; border-radius: 50%; background: radial-gradient(60% 60% at 30% 30%, #34d399, #16a34a); box-shadow: 0 2px 8px rgba(22,163,74,.35); }

.feature-card { background: linear-gradient(180deg, #ffffff, #f9fafb); border: 1px solid var(--slate-100); border-radius: var(--radius); box-shadow: var(--shadow-1); overflow: hidden; }
[data-theme="dark"] .feature-card { background: linear-gradient(180deg, #111827, #0f172a); }
.feature-card__header { background: linear-gradient(135deg, #f0f7ff, #ebffef); color: var(--slate-900); font-weight: 800; padding: .8rem 1rem; border-bottom: 1px solid var(--slate-100); }
.feature-card__list { list-style: none; padding: .4rem .8rem 1rem; margin: 0; display: grid; gap: .6rem; }
.feature-card__list li { background: #fff; border: 1px solid var(--slate-100); padding: .7rem .8rem; border-radius: 12px; display: flex; align-items: center; gap: .6rem; }

.project-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.project { background: var(--white); border: 1px solid var(--slate-100); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-1); display: grid; transition: transform .2s ease, box-shadow .2s ease; }
.project:hover { transform: translateY(-3px); box-shadow: var(--shadow-2); }
.project-media { aspect-ratio: 16 / 9; background-size: cover; background-position: center; }
.project-media--one { background-image: radial-gradient(60% 100% at 20% 20%, rgba(37,99,235,.5), transparent), radial-gradient(60% 80% at 80% 60%, rgba(34,197,94,.5), transparent), linear-gradient(135deg, #93c5fd, #86efac); }
.project-media--two { background-image: radial-gradient(60% 100% at 20% 20%, rgba(34,197,94,.5), transparent), linear-gradient(135deg, #c7d2fe, #a7f3d0); }
.project-media--three { background-image: radial-gradient(80% 100% at 30% 40%, rgba(37,99,235,.45), transparent), linear-gradient(135deg, #93c5fd, #6ee7b7); }
.project-body { padding: .9rem 1rem 1.1rem; }
.tags { display: flex; gap: .4rem; margin-top: .6rem; }

.event-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.event { background: var(--white); border: 1px solid var(--slate-100); padding: 1rem; border-radius: var(--radius); display: grid; grid-template-columns: auto 1fr; gap: 1rem; align-items: center; box-shadow: var(--shadow-1); transition: transform .18s ease, box-shadow .18s ease; }
.event:hover { transform: translateY(-2px); box-shadow: var(--shadow-2); }
.event-date { width: 64px; height: 64px; display: grid; place-items: center; border-radius: 14px; color: var(--white); background: linear-gradient(135deg, var(--blue-600), var(--green-600)); box-shadow: var(--shadow-1); }
.event-date .day { font-weight: 800; font-size: 1.15rem; line-height: 1; }
.event-date .month { font-size: .8rem; opacity: .9; }

/* Timeline (desktop) */
@media (min-width: 960px) {
  .event-list { grid-template-columns: 1fr; position: relative; }
  .event-list::before { content:""; position: absolute; left: 44px; top: 0; bottom: 0; width: 2px; background: linear-gradient(180deg, var(--blue-800), var(--green-600)); opacity: .25; }
  .event { grid-template-columns: 1fr; padding-left: 84px; position: relative; }
  .event-date { position: absolute; left: 12px; top: 16px; width: 64px; height: 64px; border-radius: 999px; }
}

/* Join form */
.join { background: linear-gradient(180deg, #ffffff, #f8fafc); }
[data-theme="dark"] .join { background: linear-gradient(180deg, #0f172a, #0b1220); }
.join-form { background: var(--white); border: 1px solid var(--slate-100); border-radius: var(--radius); padding: 1rem; box-shadow: var(--shadow-1); }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.form-grid .full { grid-column: 1 / -1; }
label span { display: block; font-weight: 600; margin-bottom: .35rem; }
input, select, textarea { width: 100%; padding: .75rem .8rem; border: 1px solid var(--slate-100); border-radius: 12px; font: inherit; background: #fff; color: var(--slate-900); outline: none; }
[data-theme="dark"] input,[data-theme="dark"] select,[data-theme="dark"] textarea { background: #0f172a; color: var(--slate-900); border-color: #1f2a3a; }
input:focus, select:focus, textarea:focus { border-color: var(--blue-600); box-shadow: 0 0 0 3px rgba(37,99,235,.12); }
.form-note { font-size: .9rem; color: var(--slate-600); margin-top: .6rem; }

/* Form mode switch */
.form-switch { display: inline-flex; background: var(--white); border: 1px solid var(--slate-100); border-radius: 12px; padding: .25rem; box-shadow: var(--shadow-1); margin-bottom: 1rem; }
.switch-btn { border: 0; background: transparent; padding: .45rem .8rem; border-radius: 8px; font-weight: 700; color: var(--slate-700); cursor: pointer; }
.switch-btn.active { background: var(--blue-50); color: var(--blue-900); }
.google-form { background: var(--white); border: 1px solid var(--slate-100); border-radius: var(--radius); box-shadow: var(--shadow-1); overflow: hidden; }
.google-form iframe { display: block; }

/* Footer */
.site-footer { border-top: 1px solid rgba(15,23,42,.06); background: #fff; margin-top: 2rem; }
.footer-inner { display: grid; grid-template-columns: 1.2fr 1fr auto; gap: 1rem; align-items: center; padding: 1rem 0; }
.footer-brand { display: flex; align-items: center; gap: .8rem; }
.footer-links { display: flex; gap: .8rem; flex-wrap: wrap; }
.footer-links a { text-decoration: none; color: var(--slate-700); font-weight: 600; padding: .25rem .5rem; border-radius: 8px; }
.footer-links a:hover { color: var(--blue-700); background: var(--blue-50); }
.footer-social { display: flex; align-items: center; gap: .6rem; color: var(--slate-600); }
.footnote { text-align: center; font-size: .9rem; color: var(--slate-600); padding: .6rem 0 1.2rem; }

/* Responsive */
@media (max-width: 960px) {
  .hero-inner { grid-template-columns: 1fr; padding: 2.2rem 0 1.2rem; }
  .card-grid { grid-template-columns: repeat(2, 1fr); }
  .project-grid { grid-template-columns: repeat(2, 1fr); }
  .event-list { grid-template-columns: repeat(2, 1fr); }
  .split { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  .site-nav { position: fixed; inset-inline: 0; top: 56px; display: grid; gap: 0; background: var(--white); backdrop-filter: blur(8px); border-bottom: 1px solid var(--border-soft); transform: translateY(-120%); transition: transform .22s ease; box-shadow: 0 12px 24px rgba(2,6,23,.06); }
  .site-nav a { padding: 1rem 1.2rem; border-radius: 0; }
  .nav-toggle { display: inline-block; }
  .site-header.open .site-nav { transform: translateY(0); }
  .container { width: min(1120px, 94%); }
  .card-grid { grid-template-columns: 1fr; }
  .project-grid { grid-template-columns: 1fr; }
  .event-list { grid-template-columns: 1fr; }
  .form-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; text-align: center; justify-items: center; gap: .6rem; }
}

@media (max-width: 480px) {
  h1 { font-size: clamp(1.8rem, 6vw + 1rem, 2.4rem); }
  .brand .school { display: none; }
  .hero-wave svg { height: 60px; }
}

/* Reveal on scroll */
[data-reveal] { opacity: 0; transform: translateY(14px); transition: opacity .6s ease, transform .6s ease; }
.is-visible { opacity: 1 !important; transform: translateY(0) !important; }

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

/* Workshops */
.workshop-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.workshop { background: var(--white); border: 1px solid var(--slate-100); border-radius: var(--radius); padding: 1rem; box-shadow: var(--shadow-1); transition: transform .18s ease, box-shadow .18s ease; }
.workshop:hover { transform: translateY(-3px); box-shadow: var(--shadow-2); }
.workshop-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: .4rem; }
.workshop-meta { color: var(--slate-600); font-weight: 600; }
@media (max-width: 960px) { .workshop-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 720px) { .workshop-grid { grid-template-columns: 1fr; } }

/* --- Enhancements: brand & polish (appended) --- */
:root {
  --brand-blue: #0f2d6b;
  --brand-blue-2: #1e3a8a;
  --brand-green: #16a34a;
  --gradient-primary: linear-gradient(135deg, var(--brand-blue-2), var(--brand-green));
  --gradient-strong: linear-gradient(135deg, #0b2a6b, #108a45);
}

.brand .logo { border-radius: 10px; box-shadow: 0 2px 10px rgba(2,6,23,.08); }

.site-nav a::after { background: linear-gradient(90deg, var(--brand-blue-2), var(--brand-green)); }
.site-nav a.active { color: var(--brand-blue); background: var(--blue-50); }
.site-nav a.active::after { transform: scaleX(1); }

.btn { position: relative; overflow: hidden; background: var(--gradient-strong); }
.btn::before { content:""; position: absolute; inset: 0; border-radius: inherit; background: linear-gradient(90deg, rgba(255,255,255,.0), rgba(255,255,255,.25), rgba(255,255,255,.0)); transform: translateX(-120%); transition: transform .4s ease; pointer-events: none; }
.btn:hover::before { transform: translateX(120%); }

.hero::before { content:""; position: absolute; inset: 0; pointer-events: none; opacity: .5; background-image: radial-gradient(rgba(15,47,107,.12) 1px, transparent 1px); background-size: 18px 18px; }
[data-theme="dark"] .hero::before { opacity: .25; background-image: radial-gradient(rgba(255,255,255,.08) 1px, transparent 1px); }

.card { position: relative; }
.card::before { content:""; position: absolute; left: 0; right: 0; top: 0; height: 3px; border-top-left-radius: inherit; border-top-right-radius: inherit; background: var(--gradient-primary); opacity: .7; }

.event .badge { margin-left: .4rem; }