/* ==========================================================================
   YENOVA — Department of Computer Science, YIASCM
   Design tokens
   ========================================================================== */
:root{
  --bg:            #090c16;
  --bg-elevated:   #10142455;
  --bg-card:       #12162a;
  --bg-card-hover: #171c34;
  --line:          rgba(255,255,255,.08);
  --line-strong:   rgba(255,255,255,.16);
  --ink:           #f5f6fb;
  --ink-dim:       #a9aec6;
  --ink-faint:     #6b7091;

  --orange: #ff7a45;
  --pink:   #e1306c;
  --violet: #8b5cf6;
  --teal:   #14b8a6;
  --blue:   #3b82f6;

  --gradient: linear-gradient(115deg, var(--orange) 0%, var(--pink) 32%, var(--violet) 58%, var(--teal) 80%, var(--blue) 100%);
  --gradient-soft: linear-gradient(115deg, rgba(255,122,69,.18) 0%, rgba(225,48,108,.18) 32%, rgba(139,92,246,.18) 58%, rgba(20,184,166,.18) 80%, rgba(59,130,246,.18) 100%);

  --radius-s: 10px;
  --radius-m: 16px;
  --radius-l: 24px;

  --shadow-card: 0 20px 60px -30px rgba(0,0,0,.7);

  --font-display: "Space Grotesk", "Segoe UI", sans-serif;
  --font-body: "Inter", "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", monospace;
}

*,*::before,*::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--font-body);
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
}
img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
h1,h2,h3,h4{ font-family:var(--font-display); margin:0 0 .5em; letter-spacing:-.01em; }
p{ margin:0 0 1em; color:var(--ink-dim); }
ul{ margin:0; padding:0; list-style:none; }
button{ font-family:inherit; cursor:pointer; }

.container{ max-width:1180px; margin:0 auto; padding:0 24px; }
.eyebrow{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--ink-faint);
  display:flex; align-items:center; gap:10px;
  margin-bottom:14px;
}
.eyebrow::before{
  content:""; width:22px; height:1px; background:var(--gradient);
}

.gradient-text{
  background:var(--gradient);
  -webkit-background-clip:text; background-clip:text; color:transparent;
}

/* Background circuit texture (echoes the brain+circuit mark) */
.circuit-field{
  position:absolute; inset:0; opacity:.35; pointer-events:none;
  background-image:
    radial-gradient(circle at 12% 20%, rgba(139,92,246,.25), transparent 40%),
    radial-gradient(circle at 85% 10%, rgba(20,184,166,.2), transparent 45%),
    radial-gradient(circle at 70% 80%, rgba(225,48,108,.18), transparent 45%);
}

/* ---------------------------------- Nav ---------------------------------- */
.site-header{
  position:sticky; top:0; z-index:50;
  background:rgba(9,12,22,.72);
  backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
}
.nav{
  display:flex; align-items:center; justify-content:space-between;
  padding:14px 24px;
}
.brand{ display:flex; align-items:center; gap:10px; }
.brand img{ height:34px; width:auto; }
.brand-word-img {
  height: 20px;
  width: auto;
  margin-left: 2px;
}
.nav-links{ display:flex; gap:32px; align-items:center; }
.nav-links a{
  font-size:14px; color:var(--ink-dim); font-weight:500;
  transition:color .2s ease; position:relative;
}
.nav-links a:hover{ color:var(--ink); }
.nav-cta{
  padding:10px 20px; border-radius:999px; background:var(--gradient);
  color:#080a12; font-weight:600; font-size:13.5px;
}
.nav-toggle{ display:none; background:none; border:0; color:var(--ink); font-size:24px; }

@media (max-width:820px){
  .nav-links{
    position:absolute; top:100%; left:0; width:100%; height:100vh; background:var(--bg);
    flex-direction:column; padding:32px 24px; gap:24px;
    transform:translateY(-8px); opacity:0; pointer-events:none;
    transition:all .25s ease; border-top:1px solid var(--line);
  }
  .nav-links.open{ transform:translateY(0); opacity:1; pointer-events:auto; }
  .nav-toggle{ display:block; }
}

/* ---------------------------------- Hero ---------------------------------- */
.hero{
  position:relative; overflow:hidden;
  padding:96px 0 88px;
  border-bottom:1px solid var(--line);
}
.hero-inner{
  position:relative; z-index:2;
  display:grid; grid-template-columns:1.15fr .85fr; gap:56px; align-items:center;
}
.hero h1{
  font-size:clamp(40px, 6vw, 68px);
  line-height:1.02;
  font-weight:700;
}
.hero .lede{ font-size:17px; max-width:52ch; margin-bottom:32px; }
.hero-actions{ display:flex; gap:14px; flex-wrap:wrap; }
.btn{
  display:inline-flex; align-items:center; gap:8px;
  padding:14px 26px; border-radius:999px; font-weight:600; font-size:14.5px;
  border:1px solid transparent; transition:transform .2s ease, border-color .2s ease;
}
.btn:hover{ transform:translateY(-2px); }
.btn-primary{ background:var(--gradient); color:#080a12; }
.btn-ghost{ border-color:var(--line-strong); color:var(--ink); }
.btn-ghost:hover{ border-color:var(--violet); }

.hero-mark{
  position:relative; aspect-ratio:1/1; border-radius:32px;
  display:flex; align-items:center; justify-content:center;
  background:radial-gradient(circle at 50% 40%, rgba(139,92,246,.16), transparent 70%);
}
.hero-mark img{ width:78%; filter:drop-shadow(0 30px 60px rgba(139,92,246,.25)); }

.hero-stats{
  display:flex; gap:36px; margin-top:44px; flex-wrap:wrap;
}
.hero-stats div strong{
  display:block; font-family:var(--font-display); font-size:26px;
}
.hero-stats div span{ font-family:var(--font-mono); font-size:11.5px; color:var(--ink-faint); text-transform:uppercase; letter-spacing:.08em; }

@media (max-width:900px){
  .hero-inner{ grid-template-columns:1fr; }
  .hero-mark{ order:-1; max-width:280px; margin:0 auto; }
}

/* ------------------------------- Section shell ------------------------------- */
.section{ padding:96px 0; position:relative; }
.section-head{ max-width:640px; margin-bottom:52px; }
.section-head h2{ font-size:clamp(28px,3.6vw,40px); }
.section-alt{ background:linear-gradient(180deg, transparent, rgba(139,92,246,.04), transparent); border-top:1px solid var(--line); border-bottom:1px solid var(--line); }

/* ------------------------------- Why Yenova ------------------------------- */
.why-grid{
  display:grid; grid-template-columns:repeat(2,1fr); gap:1px;
  background:var(--line); border:1px solid var(--line); border-radius:var(--radius-l);
  overflow:hidden;
}
.why-card{
  background:var(--bg-card); padding:34px 30px; transition:background .25s ease;
}
.why-card:hover{ background:var(--bg-card-hover); }
.why-num{
  font-family:var(--font-mono); font-size:12px; color:var(--ink-faint);
  margin-bottom:18px; display:block;
}
.why-icon{
  width:40px; height:40px; border-radius:10px; margin-bottom:18px;
  display:flex; align-items:center; justify-content:center;
  background:var(--gradient-soft); border:1px solid var(--line-strong);
}
.why-icon svg{ width:20px; height:20px; }
.why-card h3{ font-size:17px; margin-bottom:8px; }
.why-card p{ font-size:14px; margin-bottom:0; }

@media (max-width:820px){ .why-grid{ grid-template-columns:1fr; } }

/* ------------------------------- Events ------------------------------- */
.events-toolbar{
  display:flex; align-items:center; justify-content:space-between; gap:16px;
  margin-bottom:32px; flex-wrap:wrap;
}
.filter-row{ display:flex; gap:8px; flex-wrap:wrap; }
.filter-chip{
  padding:8px 16px; border-radius:999px; border:1px solid var(--line-strong);
  font-size:13px; color:var(--ink-dim); background:transparent; transition:all .2s ease;
  font-family:var(--font-mono);
}
.filter-chip.active, .filter-chip:hover{ color:var(--ink); border-color:var(--violet); background:rgba(139,92,246,.1); }

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(200px, 100%), 1fr));
  grid-auto-rows: 250px;
  grid-auto-flow: dense;
  gap: 16px;
}
.gallery-item {
  position: relative;
  border-radius: 8px;
  overflow: hidden;
  background: var(--surface);
  grid-column: span 1;
  grid-row: span 1;
}
.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}
.gallery-item:hover img {
  transform: scale(1.05);
}

/* Bento Box pseudo-random sizes (Desktop only) */
@media (min-width: 769px) {
  .gallery-item:nth-child(4n+1) {
    grid-column: span 2;
    grid-row: span 2;
  }
  .gallery-item:nth-child(5n+3) {
    grid-column: span 1;
    grid-row: span 2;
  }
  .gallery-item:nth-child(7n+2) {
    grid-column: span 2;
    grid-row: span 1;
  }
}

@media (max-width: 768px) {
  .gallery-grid {
    grid-auto-rows: 200px;
  }
}

.events-grid{
  display:grid; grid-template-columns:repeat(auto-fill, minmax(min(280px, 100%), 1fr)); gap:26px;
}
.event-card{
  background:var(--bg-card); border:1px solid var(--line); border-radius:var(--radius-m);
  overflow:hidden; display:flex; flex-direction:column; box-shadow:var(--shadow-card);
  transition:transform .25s ease, border-color .25s ease;
}
.event-card:hover{ transform:translateY(-4px); border-color:var(--line-strong); }
.event-media{ position:relative; aspect-ratio:4/5; overflow:hidden; background:#050710; }
.event-media img{ width:100%; height:100%; object-fit:cover; }
.event-status{
  position:absolute; top:12px; left:12px; padding:5px 12px; border-radius:999px;
  font-family:var(--font-mono); font-size:10.5px; text-transform:uppercase; letter-spacing:.08em;
  backdrop-filter:blur(6px);
}
.event-status.upcoming{ background:rgba(20,184,166,.22); color:#5eead4; border:1px solid rgba(20,184,166,.4); }
.event-status.completed{ background:rgba(255,255,255,.1); color:var(--ink-dim); border:1px solid var(--line-strong); }
.event-tag{
  position:absolute; top:12px; right:12px; padding:5px 12px; border-radius:999px;
  font-family:var(--font-mono); font-size:10.5px; background:rgba(9,12,22,.6);
  border:1px solid var(--line-strong); backdrop-filter:blur(6px);
}
.event-body{ padding:22px 22px 24px; display:flex; flex-direction:column; gap:10px; flex:1; }
.event-date{ font-family:var(--font-mono); font-size:12px; color:var(--violet); letter-spacing:.04em; }
.event-body h3{ font-size:19px; line-height:1.25; }
.event-sub{ font-size:13.5px; color:var(--ink-dim); margin-bottom:4px; }
.event-meta{ display:flex; gap:14px; flex-wrap:wrap; font-size:12.5px; color:var(--ink-faint); margin-top:auto; padding-top:10px; border-top:1px solid var(--line); }
.event-meta span{ display:flex; align-items:center; gap:6px; }

.events-empty{
  padding:60px 24px; text-align:center; border:1px dashed var(--line-strong); border-radius:var(--radius-m);
  color:var(--ink-faint); font-family:var(--font-mono); font-size:13px;
}

/* ------------------------------- Contact / Footer ------------------------------- */
.contact-panel{
  display:grid; grid-template-columns:1fr 1fr; gap:1px; background:var(--line);
  border:1px solid var(--line); border-radius:var(--radius-l); overflow:hidden;
}
.contact-copy, .contact-links{ background:var(--bg-card); padding:44px; }
.contact-links a{
  display:flex; align-items:center; justify-content:space-between;
  padding:16px 0; border-bottom:1px solid var(--line); font-size:15px; font-weight:500;
  transition:color .2s ease;
}
.contact-links a:last-child{ border-bottom:none; }
.contact-links a:hover{ color:var(--violet); }
.contact-links a span.arrow{ color:var(--ink-faint); font-family:var(--font-mono); }

@media (max-width:820px){ .contact-panel{ grid-template-columns:1fr; } }

.site-footer{
  border-top:1px solid var(--line); padding:40px 0; margin-top:20px;
}
.footer-row{ display:flex; align-items:center; justify-content:space-between; flex-wrap:wrap; gap:16px; }
.footer-row .brand-word{ font-size:16px; }
.footer-meta{ font-size:12.5px; color:var(--ink-faint); font-family:var(--font-mono); }

/* ------------------------------- Utility ------------------------------- */
.reveal{ opacity:0; transform:translateY(16px); transition:opacity .6s ease, transform .6s ease; }
.reveal.in{ opacity:1; transform:none; }

::selection{ background:var(--violet); color:#fff; }
.hidden{ display:none !important; }

/* ------------------------------- Forms (shared) ------------------------------- */
.field{ text-align:left; margin-bottom:16px; }
.field label{ font-family:var(--font-mono); font-size:11.5px; text-transform:uppercase; letter-spacing:.06em; color:var(--ink-faint); display:block; margin-bottom:6px; }
input, select, textarea{
  width:100%; background:#080a13; border:1px solid var(--line-strong); color:var(--ink);
  padding:11px 13px; border-radius:var(--radius-s); font-family:var(--font-body); font-size:14px;
  transition:border-color .2s ease;
}
input:focus, select:focus, textarea:focus{ outline:none; border-color:var(--violet); }
textarea{ resize:vertical; min-height:90px; }
.form-error{ font-size:12.5px; color:#ff8a8a; min-height:16px; margin-top:-6px; margin-bottom:14px; }
.form-note{ font-size:12.5px; color:#5eead4; min-height:16px; margin-top:-6px; margin-bottom:14px; }
.hint{ font-size:12px; color:var(--ink-faint); margin-top:16px; }

/* ------------------------------- Modal (shared) ------------------------------- */
.modal-backdrop{
  position:fixed; inset:0; background:rgba(4,5,10,.72); backdrop-filter:blur(4px);
  display:flex; align-items:flex-start; justify-content:center; padding:40px 20px;
  z-index:100; overflow-y:auto;
}
.modal-backdrop.hidden{ display:none; }
.modal{
  width:100%; max-width:640px; background:var(--bg-card); border:1px solid var(--line-strong);
  border-radius:var(--radius-l); padding:32px; box-shadow:var(--shadow-card);
}
.modal.modal-small{ max-width:440px; }
.modal-head{ display:flex; align-items:center; justify-content:space-between; margin-bottom:22px; }
.modal-head h3{ font-size:19px; margin:0; }
.modal-head p{ font-size:13px; margin:4px 0 0; }
.modal-close{ background:none; border:0; color:var(--ink-faint); font-size:20px; }
.modal-close:hover{ color:var(--ink); }
.form-grid{ display:grid; grid-template-columns:1fr 1fr; gap:16px; }
.form-grid .span-2{ grid-column:1 / -1; }
.modal-actions{ display:flex; justify-content:flex-end; gap:12px; margin-top:8px; }

.toast{
  position:fixed; bottom:24px; left:50%; transform:translateX(-50%) translateY(20px);
  background:var(--bg-card-hover); border:1px solid var(--line-strong); padding:12px 22px;
  border-radius:999px; font-size:13.5px; opacity:0; pointer-events:none; transition:all .25s ease;
  z-index:200; box-shadow:var(--shadow-card); max-width:88vw; text-align:center;
}
.toast.show{ opacity:1; transform:translateX(-50%) translateY(0); }

@media (max-width:720px){
  .form-grid{ grid-template-columns:1fr; }
}

/* ------------------------------- Register button on event cards ------------------------------- */
.event-register-btn{
  margin-top:6px; width:100%; padding:11px 16px; border-radius:999px;
  background:var(--gradient); color:#080a12; font-weight:600; font-size:13.5px;
  border:none; text-align:center; transition:transform .2s ease, opacity .2s ease;
}
.event-register-btn:hover{ transform:translateY(-2px); }
.event-register-btn:disabled{ opacity:.5; cursor:not-allowed; transform:none; }
.event-register-btn.closed{ background:transparent; border:1px solid var(--line-strong); color:var(--ink-faint); }