/* =============================================================
   HackSJSU — Global Design System
   All colors read from CSS custom properties set by config.js.
   Fonts loaded from Google Fonts via HTML <link>.
   ============================================================= */

/* ── Google Fonts ─────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700;800&family=Inter:wght@300;400;500;600;700&display=swap');

/* ── CSS Custom Properties (defaults — overridden by config.js) ─ */
:root {
  --clr-primary:     #0055A2;
  --clr-secondary:   #E5A823;
  --clr-accent:      #FFD700;
  --clr-bg:          #060D1A;
  --clr-card:        #0D1B2E;
  --clr-surface:     #142338;
  --clr-navbar:      rgba(6,13,26,0.90);
  --clr-text:        #FFFFFF;
  --clr-text-muted:  #8BA3C7;
  --clr-text-dim:    #4A6080;
  --clr-border:      rgba(0,85,162,0.30);
  --glow-p:          rgba(0,85,162,0.55);
  --glow-s:          rgba(229,168,35,0.45);
  --grad-cta:        linear-gradient(135deg, #0055A2, #E5A823);
  --grad-card:       linear-gradient(135deg, rgba(0,85,162,0.15), rgba(229,168,35,0.08));
  --font-heading:    "Space Grotesk", sans-serif;
  --font-body:       "Inter", sans-serif;

  --radius-sm:    6px;
  --radius-md:    12px;
  --radius-lg:    20px;
  --radius-xl:    28px;
  --radius-full:  9999px;

  --shadow-card:  0 4px 24px rgba(0,0,0,0.4);
  --shadow-glow:  0 0 24px var(--glow-p);
  --shadow-gold:  0 0 24px var(--glow-s);

  --transition:   0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --max-w:        1200px;
}

/* ── Reset ────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family:      var(--font-body);
  background-color: var(--clr-bg);
  color:            var(--clr-text);
  line-height:      1.6;
  -webkit-font-smoothing: antialiased;
}
img  { max-width: 100%; display: block; }
a    { color: inherit; text-decoration: none; }
ul   { list-style: none; }
button { cursor: pointer; font-family: inherit; border: none; background: none; }

/* ── Typography ───────────────────────────────────────────── */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  line-height: 1.15;
  font-weight: 700;
}
h1 { font-size: clamp(2.4rem, 6vw, 4.5rem); }
h2 { font-size: clamp(1.8rem, 4vw, 3rem); }
h3 { font-size: clamp(1.3rem, 3vw, 2rem); }
h4 { font-size: 1.2rem; }
p  { color: var(--clr-text-muted); }

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

/* ── Layout ───────────────────────────────────────────────── */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
}
.section {
  padding: 5rem 0;
}
.section-sm { padding: 3rem 0; }
.section-header {
  text-align: center;
  margin-bottom: 3.5rem;
}
.section-header h2 { margin-bottom: 0.75rem; }
.section-header p  { max-width: 600px; margin: 0 auto; font-size: 1.1rem; }
.section-tag {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--clr-secondary);
  background: rgba(229,168,35,0.12);
  border: 1px solid rgba(229,168,35,0.25);
  padding: 0.3rem 0.9rem;
  border-radius: var(--radius-full);
  margin-bottom: 1rem;
}
.grid-2  { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 1.5rem; }
.grid-3  { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1.5rem; }
.grid-4  { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1.25rem; }

/* ── Buttons ──────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-full);
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 600;
  transition: var(--transition);
  white-space: nowrap;
}
.btn-primary {
  background: var(--grad-cta);
  color: #fff;
  box-shadow: 0 4px 20px var(--glow-p);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px var(--glow-p);
}
.btn-outline {
  border: 2px solid var(--clr-primary);
  color: var(--clr-text);
  background: transparent;
}
.btn-outline:hover {
  background: rgba(0,85,162,0.15);
  border-color: var(--clr-secondary);
  color: var(--clr-secondary);
}
.btn-gold {
  background: var(--clr-secondary);
  color: #060D1A;
  font-weight: 700;
}
.btn-gold:hover {
  background: var(--clr-accent);
  box-shadow: 0 8px 28px var(--glow-s);
  transform: translateY(-2px);
}
.btn-sm { padding: 0.5rem 1.2rem; font-size: 0.875rem; }

/* ── Cards ────────────────────────────────────────────────── */
.card {
  background: var(--clr-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--grad-card);
  opacity: 0;
  transition: var(--transition);
  border-radius: inherit;
}
.card:hover {
  border-color: rgba(0,85,162,0.6);
  box-shadow: var(--shadow-glow);
  transform: translateY(-4px);
}
.card:hover::before { opacity: 1; }
.card > * { position: relative; z-index: 1; }

.card-glass {
  background: rgba(13,27,46,0.7);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
}

/* ── Navbar ───────────────────────────────────────────────── */
#navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: transparent;
  transition: background 0.3s, box-shadow 0.3s;
}
#navbar.scrolled {
  background: var(--clr-navbar);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 rgba(255,255,255,0.06);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}
.nav-logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 800;
  background: var(--grad-cta);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  flex-shrink: 0;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}
.nav-link {
  padding: 0.45rem 0.8rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--clr-text-muted);
  transition: var(--transition);
}
.nav-link:hover,
.nav-link.active { color: var(--clr-text); background: rgba(255,255,255,0.06); }
.nav-cta { margin-left: 0.75rem; }
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  border-radius: var(--radius-sm);
}
.nav-hamburger span {
  display: block;
  width: 24px; height: 2px;
  background: var(--clr-text);
  border-radius: 2px;
  transition: var(--transition);
}
.nav-mobile {
  display: none;
  flex-direction: column;
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--clr-border);
  background: var(--clr-navbar);
  backdrop-filter: blur(20px);
  gap: 0.25rem;
}
.nav-mobile.open { display: flex; }
.nav-mobile .nav-link { display: block; padding: 0.6rem 0.75rem; }
.nav-mobile .btn { margin-top: 0.5rem; width: 100%; justify-content: center; }

@media (max-width: 900px) {
  .nav-links, .nav-cta { display: none; }
  .nav-hamburger { display: flex; }
}

/* ── Hero ─────────────────────────────────────────────────── */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: 68px;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 20% 40%, rgba(0,85,162,0.25) 0%, transparent 60%),
              radial-gradient(ellipse 60% 50% at 80% 70%, rgba(229,168,35,0.15) 0%, transparent 60%),
              var(--clr-bg);
}
/* Animated grid mesh */
.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,85,162,0.12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,85,162,0.12) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 90% 90% at 50% 50%, black 30%, transparent 80%);
  animation: gridPulse 8s ease-in-out infinite alternate;
}
@keyframes gridPulse {
  from { opacity: 0.5; }
  to   { opacity: 1; }
}
/* Floating glow orbs */
.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  animation: orbFloat 10s ease-in-out infinite alternate;
}
.hero-orb-1 {
  width: 500px; height: 500px;
  top: -100px; left: -100px;
  background: radial-gradient(circle, rgba(0,85,162,0.35), transparent 70%);
  animation-delay: 0s;
}
.hero-orb-2 {
  width: 400px; height: 400px;
  bottom: -80px; right: -60px;
  background: radial-gradient(circle, rgba(229,168,35,0.25), transparent 70%);
  animation-delay: -5s;
}
@keyframes orbFloat {
  from { transform: translate(0, 0) scale(1); }
  to   { transform: translate(30px, -40px) scale(1.1); }
}
.hero-content {
  position: relative;
  z-index: 2;
}
.hero-eyebrow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.35rem 0.9rem;
  border-radius: var(--radius-full);
}
.badge-sponsors {
  background: rgba(229,168,35,0.12);
  border: 1px solid rgba(229,168,35,0.3);
  color: var(--clr-secondary);
}
.badge-status-reg  { background: rgba(0,200,100,0.12); border: 1px solid rgba(0,200,100,0.3); color: #00C864; }
.badge-status-soon { background: rgba(0,85,162,0.12);  border: 1px solid rgba(0,85,162,0.3);  color: var(--clr-primary); }
.badge-status-live { background: rgba(229,0,0,0.12);   border: 1px solid rgba(229,0,0,0.3);   color: #FF4444; }
.badge-dot { width: 6px; height: 6px; border-radius: 50%; background: currentColor; animation: blink 1.5s ease-in-out infinite; }
@keyframes blink { 0%,100%{opacity:1} 50%{opacity:0.3} }

.hero-title { margin-bottom: 1.25rem; }
.hero-title .event-name {
  display: block;
  background: var(--grad-cta);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-tagline {
  font-size: clamp(1.1rem, 2.5vw, 1.4rem);
  color: var(--clr-text-muted);
  margin-bottom: 1.5rem;
  max-width: 580px;
}
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}
.hero-meta-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.95rem;
  color: var(--clr-text-muted);
}
.hero-meta-item .icon { font-size: 1.1rem; }
.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}

/* ── Countdown ────────────────────────────────────────────── */
.countdown {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}
.countdown-unit {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  text-align: center;
  min-width: 80px;
  backdrop-filter: blur(8px);
  transition: var(--transition);
}
.countdown-unit:hover { border-color: var(--clr-primary); box-shadow: var(--shadow-glow); }
.countdown-number {
  display: block;
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--clr-text);
  line-height: 1;
  background: var(--grad-cta);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.countdown-label {
  display: block;
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--clr-text-dim);
  margin-top: 0.35rem;
}
.countdown-ended {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--clr-secondary);
}

/* ── Stats Bar ────────────────────────────────────────────── */
.stats-bar {
  background: var(--clr-card);
  border-top: 1px solid var(--clr-border);
  border-bottom: 1px solid var(--clr-border);
  padding: 2rem 0;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem;
  text-align: center;
}
.stat-item .stat-num {
  font-family: var(--font-heading);
  font-size: 2.2rem;
  font-weight: 800;
  background: var(--grad-cta);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-item .stat-label {
  font-size: 0.85rem;
  color: var(--clr-text-muted);
  margin-top: 0.25rem;
}

/* ── Judge / Mentor Cards ─────────────────────────────────── */
.person-card {
  background: var(--clr-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
  position: relative;
}
.person-card:hover {
  border-color: rgba(0,85,162,0.5);
  box-shadow: var(--shadow-glow);
  transform: translateY(-6px);
}
.person-card-img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  display: block;
}
.person-card-body {
  padding: 1.25rem;
}
.person-card-name {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.2rem;
}
.person-card-title {
  font-size: 0.85rem;
  color: var(--clr-secondary);
  font-weight: 500;
  margin-bottom: 0.1rem;
}
.person-card-company {
  font-size: 0.8rem;
  color: var(--clr-text-muted);
  margin-bottom: 0.75rem;
}
.person-card-bio {
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--clr-text-muted);
  margin-bottom: 0.75rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.person-card-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--clr-primary);
  background: rgba(0,85,162,0.12);
  border: 1px solid rgba(0,85,162,0.25);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  margin-bottom: 0.75rem;
}
.person-card-links {
  display: flex;
  gap: 0.5rem;
}
.person-card-links a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px; height: 32px;
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--clr-border);
  color: var(--clr-text-muted);
  font-size: 0.9rem;
  transition: var(--transition);
}
.person-card-links a:hover {
  background: rgba(0,85,162,0.2);
  border-color: var(--clr-primary);
  color: var(--clr-text);
}

/* ── Keynote Speaker Cards ────────────────────────────────── */
.keynote-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 360px));
  gap: 2rem;
  justify-content: center;
}
.person-card--keynote {
  border-color: rgba(229,168,35,0.4);
  background: linear-gradient(160deg, var(--clr-card) 60%, rgba(229,168,35,0.06));
  max-width: 380px;
}
.person-card--keynote:hover {
  border-color: rgba(229,168,35,0.8);
  box-shadow: 0 0 40px rgba(229,168,35,0.25), var(--shadow-glow);
}
.person-card--keynote .person-card-img {
  aspect-ratio: 4 / 3;
  object-position: center top;
}
.keynote-badge {
  position: absolute;
  top: 1rem;
  left: 1rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #1a0f00;
  background: linear-gradient(135deg, #E5A823, #FFD700);
  padding: 0.3rem 0.8rem;
  border-radius: var(--radius-full);
  box-shadow: 0 2px 12px rgba(229,168,35,0.5);
  z-index: 2;
}


/* ═══════════════════════════════════════════════════════════
   ZGX NANO GAMIFICATION — Animations & Effects
   ═══════════════════════════════════════════════════════════ */

/* ── 1. Rotating halo border on specs card ───────────────── */
@property --halo-angle {
  syntax: '<angle>';
  inherits: false;
  initial-value: 0deg;
}
@keyframes halo-spin  { to { --halo-angle: 360deg; } }
@keyframes halo-pulse { 0%,100%{opacity:.7} 50%{opacity:1} }

.zgx-specs-halo {
  position: relative;
  border-radius: 20px;
  padding: 2px;
  background: conic-gradient(from var(--halo-angle),
    #0055A2 0%,#0096D6 25%,#00C8FF 40%,#E5A823 55%,#0055A2 70%,#0096D6 85%,#0055A2 100%);
  animation: halo-spin 4s linear infinite, halo-pulse 2.5s ease-in-out infinite;
  box-shadow: 0 0 32px rgba(0,150,214,.35), 0 0 64px rgba(0,85,162,.2);
}
.zgx-specs-halo-inner {
  border-radius: 18px;
  overflow: hidden;
  background: var(--clr-card);
}

/* ── 2. Canvas neural-network background ─────────────────── */
#zgx-canvas {
  position: absolute;
  inset: 0; width: 100%; height: 100%;
  pointer-events: none;
  opacity: .55;
}
#zgx-nano-spotlight { position: relative; overflow: hidden; }

/* ── 3. "ZGX NANO ONLINE" badge ──────────────────────────── */
@keyframes online-pulse {
  0%,100%{box-shadow:0 0 0 0 rgba(0,200,100,.6),0 0 8px rgba(0,200,100,.3)}
  50%    {box-shadow:0 0 0 6px rgba(0,200,100,0),0 0 16px rgba(0,200,100,.5)}
}
@keyframes dot-blink { 0%,100%{opacity:1} 50%{opacity:.3} }

.zgx-online-badge {
  display: inline-flex; align-items: center; gap: .5rem;
  background: rgba(0,200,100,.08);
  border: 1px solid rgba(0,200,100,.35);
  border-radius: 9999px;
  padding: .35rem .9rem .35rem .6rem;
  font-size: .78rem; font-weight: 700;
  color: #00C878; letter-spacing: .05em; text-transform: uppercase;
  animation: online-pulse 2s ease-in-out infinite;
}
.zgx-online-badge .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: #00C878; flex-shrink: 0;
  animation: dot-blink 1.2s ease-in-out infinite;
}

/* ── 4. Boot-sequence terminal ───────────────────────────── */
@keyframes scan-line { from{transform:translateX(-100%)} to{transform:translateX(200%)} }

.zgx-boot-terminal {
  background: rgba(0,10,24,.9);
  border: 1px solid rgba(0,150,214,.3);
  border-radius: 12px; padding: 1rem 1.25rem;
  font-family: 'Courier New', monospace;
  font-size: .78rem; color: #4da3ff; line-height: 1.8;
  margin-top: 1.5rem; position: relative; overflow: hidden;
}
.zgx-boot-terminal::before {
  content:''; position:absolute; top:0; left:0; right:0; height:2px;
  background: linear-gradient(90deg,transparent,#0096D6,transparent);
  animation: scan-line 3s linear infinite;
}
.boot-line {
  display: block; overflow: hidden; white-space: nowrap;
  max-width: 100%; width: 0; opacity: 0;
}
.boot-line.typed {
  width: 100%; opacity: 1;
  animation: type-in .5s steps(40,end) forwards;
}
@keyframes type-in { from{width:0} to{width:100%} }
.boot-line .ok   { color: #00C878; }
.boot-line .warn { color: #E5A823; }
.boot-line .dim  { color: #4A6080; }

/* ── 5. Challenge cards — ZGX Nano power bar ─────────────── */
.zgx-power-bar-wrap {
  height: 3px; background: rgba(0,85,162,.15);
  border-radius: 9999px; margin-top: .75rem; overflow: hidden;
}
.zgx-power-bar {
  height: 100%; border-radius: 9999px; width: 0%;
  background: linear-gradient(90deg,#0055A2,#0096D6,#00C8FF);
  transition: width 1.2s cubic-bezier(.16,1,.3,1);
  box-shadow: 0 0 8px rgba(0,150,214,.6);
}

/* ── 6. Scroll-triggered section reveal ──────────────────── */
.zgx-reveal {
  opacity: 0; transform: translateY(28px);
  transition: opacity .7s ease, transform .7s cubic-bezier(.16,1,.3,1);
}
.zgx-reveal.visible { opacity: 1; transform: translateY(0); }

/* ── 7. Floating ZGX status chip ─────────────────────────── */
@keyframes chip-float { 0%,100%{transform:translateY(0)} 50%{transform:translateY(-6px)} }

#zgx-status-chip {
  position: fixed; bottom: 1.5rem; right: 1.5rem; z-index: 900;
  background: rgba(6,13,26,.92);
  border: 1px solid rgba(0,150,214,.4);
  border-radius: 12px; padding: .6rem .9rem;
  display: flex; align-items: center; gap: .5rem;
  font-size: .72rem; font-weight: 700; color: #4da3ff; letter-spacing: .04em;
  backdrop-filter: blur(12px);
  box-shadow: 0 4px 20px rgba(0,0,0,.4),0 0 16px rgba(0,150,214,.15);
  animation: chip-float 3.5s ease-in-out infinite;
  cursor: default; user-select: none; transition: opacity .3s, border-color .3s;
}
#zgx-status-chip .chip-dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: #00C878; flex-shrink: 0;
  animation: dot-blink 1.4s ease-in-out infinite;
}
#zgx-status-chip:hover {
  border-color: rgba(0,200,100,.5);
  box-shadow: 0 4px 24px rgba(0,0,0,.5),0 0 20px rgba(0,150,214,.25);
}
@media (max-width:600px) {
  #zgx-status-chip { bottom:1rem; right:1rem; font-size:.65rem; }
}
.challenge-card {
  background: var(--clr-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: 1.6rem;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.challenge-card::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--challenge-color, var(--clr-primary));
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}
.challenge-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
  border-color: var(--challenge-color, var(--clr-primary));
}
.challenge-emoji { font-size: 2.25rem; margin-bottom: .75rem; display: block; }
.challenge-title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  line-height: 1.3;
}
.challenge-desc { font-size: 0.83rem; line-height: 1.6; color: var(--clr-text-muted); margin-bottom: 1rem; flex: 1; }
.challenge-prize {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 800;
  background: var(--grad-cta);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.25rem;
}
.challenge-prize-label { font-size: 0.8rem; color: var(--clr-text-muted); }
.challenge-badge-special {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--clr-secondary);
  background: rgba(229,168,35,0.12);
  border: 1px solid rgba(229,168,35,0.3);
  padding: 0.25rem 0.7rem;
  border-radius: var(--radius-full);
  margin-bottom: 0.75rem;
}
.challenge-reqs { margin: .75rem 0; }
.challenge-reqs li {
  font-size: 0.8rem;
  color: var(--clr-text-muted);
  padding: 0.2rem 0;
  padding-left: 1.25rem;
  position: relative;
  line-height: 1.5;
}
.challenge-reqs li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--clr-secondary);
  font-weight: 700;
}
.tools-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.75rem;
}
.tool-tag {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--clr-text-muted);
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--clr-border);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
}

/* ── Challenge grid ────────────────────────────────── */
.challenges-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
@media (max-width: 960px) {
  .challenges-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .challenges-grid { grid-template-columns: 1fr; }
}

/* ── Schedule Timeline ────────────────────────────────────── */
.schedule-tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}
.schedule-tab {
  padding: 0.6rem 1.4rem;
  border-radius: var(--radius-full);
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 600;
  border: 2px solid var(--clr-border);
  color: var(--clr-text-muted);
  transition: var(--transition);
  cursor: pointer;
  background: transparent;
}
.schedule-tab.active,
.schedule-tab:hover {
  background: var(--grad-cta);
  border-color: transparent;
  color: #fff;
}
.schedule-day { display: none; }
.schedule-day.active { display: block; }
.timeline { position: relative; }
.timeline::before {
  content: '';
  position: absolute;
  left: 90px;
  top: 0; bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--clr-primary), var(--clr-secondary));
  opacity: 0.3;
}
.timeline-item {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
  align-items: flex-start;
}
.timeline-time {
  min-width: 80px;
  text-align: right;
  font-family: var(--font-heading);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--clr-text-muted);
  padding-top: 0.85rem;
  flex-shrink: 0;
}
.timeline-dot {
  position: relative;
  z-index: 1;
  flex-shrink: 0;
  margin-top: 0.85rem;
}
.timeline-dot-inner {
  width: 14px; height: 14px;
  border-radius: 50%;
  border: 2px solid var(--clr-primary);
  background: var(--clr-bg);
  transition: var(--transition);
}
.timeline-item:hover .timeline-dot-inner {
  background: var(--clr-primary);
  box-shadow: 0 0 12px var(--glow-p);
}
.timeline-content {
  flex: 1;
  background: var(--clr-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  transition: var(--transition);
}
.timeline-item:hover .timeline-content {
  border-color: rgba(0,85,162,0.4);
}
.timeline-event-title {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
}
.timeline-event-desc {
  font-size: 0.85rem;
  color: var(--clr-text-muted);
  line-height: 1.5;
}
.timeline-type-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.15rem 0.55rem;
  border-radius: var(--radius-full);
  margin-bottom: 0.4rem;
}
.type-keynote   { background: rgba(229,168,35,0.15); color: #E5A823; }
.type-hacking   { background: rgba(0,200,100,0.12);  color: #00C878; }
.type-workshop  { background: rgba(0,85,162,0.15);   color: var(--clr-primary); }
.type-mentoring { background: rgba(180,0,200,0.12);  color: #C87FFF; }
.type-logistics { background: rgba(255,255,255,0.06);color: var(--clr-text-muted); }
.type-judging   { background: rgba(255,80,80,0.12);  color: #FF8080; }
.type-event     { background: rgba(0,85,162,0.10);   color: #6BAAFF; }

/* ── Prizes ───────────────────────────────────────────────── */
.prizes-podium {
  display: grid;
  grid-template-columns: 1fr 1.15fr 1fr;
  gap: 1.25rem;
  align-items: end;
  margin-bottom: 3rem;
}
.prize-card {
  background: var(--clr-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: 2rem 1.5rem;
  text-align: center;
  transition: var(--transition);
}
.prize-card.highlight {
  background: linear-gradient(135deg, rgba(0,85,162,0.2), rgba(229,168,35,0.15));
  border-color: rgba(229,168,35,0.4);
  box-shadow: 0 0 40px rgba(229,168,35,0.15);
}
.prize-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}
.prize-place {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}
.prize-amount {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 800;
  background: var(--grad-cta);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1rem;
}
.prize-perks { text-align: left; }
.prize-perks li {
  font-size: 0.875rem;
  color: var(--clr-text-muted);
  padding: 0.3rem 0;
  padding-left: 1.2rem;
  position: relative;
}
.prize-perks li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--clr-secondary);
}
.track-prizes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}
.track-prize-card {
  background: var(--clr-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition);
}
.track-prize-card:hover {
  border-color: rgba(0,85,162,0.4);
  transform: translateX(4px);
}
.track-prize-name { font-size: 0.9rem; font-weight: 600; }
.track-prize-amt {
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--clr-secondary);
}
.special-award-card {
  background: var(--clr-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  transition: var(--transition);
}
.special-award-card:hover { border-color: rgba(229,168,35,0.4); }
.special-award-name { font-family: var(--font-heading); font-weight: 700; margin-bottom: 0.3rem; }
.special-award-desc { font-size: 0.85rem; color: var(--clr-text-muted); margin-bottom: 0.5rem; }
.special-award-prize { font-weight: 700; color: var(--clr-secondary); font-size: 0.95rem; }

/* ── Sponsors ─────────────────────────────────────────────── */
.sponsor-tier-label {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--clr-text-muted);
  text-align: center;
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}
.sponsor-tier-label::before, .sponsor-tier-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--clr-border);
}
.sponsor-tier-label.platinum { color: var(--clr-secondary); }
.sponsor-tier-label.gold     { color: #FFD700; }
.sponsor-tier-label.silver   { color: #C0C0C0; }
.sponsor-tier-label.bronze   { color: #CD7F32; }
.sponsors-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  justify-content: center;
  margin-bottom: 2.5rem;
}

/* Event-partner grid: 2 equal-width columns, generous size */
.sponsors-grid.event-partner-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 420px));
  gap: 1.25rem;
  justify-content: center;
  max-width: 880px;
  margin: 0 auto 2.5rem;
}

.sponsor-card {
  background: var(--clr-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: 1.5rem 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  cursor: pointer;
}

/* Event-partner cards: landscape rectangle with logo + name side-by-side */
.sponsors-grid.event-partner-grid .sponsor-card {
  padding: 1.5rem 2rem;
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: flex-start;
  gap: 1.25rem;
  min-height: 100px;
}

/* Logo container for event-partner cards */
.sponsors-grid.event-partner-grid .sponsor-logo-wrap {
  flex-shrink: 0;
  width: 80px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,0.03);
  border-radius: 10px;
  overflow: hidden;
}

.sponsor-card.platinum { min-width: 240px; min-height: 120px; }
.sponsor-card.gold     { min-width: 180px; min-height: 100px; }
.sponsor-card.silver   { min-width: 140px; min-height: 80px; }
.sponsor-card.bronze   { min-width: 120px; min-height: 70px; }

.sponsor-card:hover {
  border-color: rgba(0, 150, 214, 0.45);
  box-shadow: 0 0 24px rgba(0,150,214,0.15), inset 0 0 40px rgba(0,150,214,0.04);
  transform: translateY(-3px);
}

.sponsor-card img {
  max-width: 100%;
  max-height: 80px;
  object-fit: contain;
  filter: brightness(0.9) grayscale(0.2);
  transition: var(--transition);
}

/* Logo image inside event-partner logo wrap */
.sponsors-grid.event-partner-grid .sponsor-logo-wrap img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  max-height: unset;
  padding: 6px;
}

.sponsor-card:hover img { filter: brightness(1) grayscale(0); }

/* Event-partner info block (name + description) */
.sponsor-info {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  min-width: 0;
}

.sponsor-info-name {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--clr-text);
  line-height: 1.3;
  letter-spacing: 0.01em;
}

.sponsor-info-desc {
  font-size: 0.75rem;
  color: var(--clr-text-muted);
  line-height: 1.4;
}

.sponsor-name {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  text-align: center;
  color: var(--clr-text);
}

@media (max-width: 600px) {
  .sponsors-grid.event-partner-grid {
    grid-template-columns: 1fr;
  }
}

/* ── FAQ ──────────────────────────────────────────────────── */
.faq-list { max-width: 760px; margin: 0 auto; }
.faq-item {
  background: var(--clr-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  margin-bottom: 0.75rem;
  overflow: hidden;
  transition: var(--transition);
}
.faq-item.open { border-color: rgba(0,85,162,0.5); }
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.5rem;
  cursor: pointer;
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  gap: 1rem;
  transition: var(--transition);
  width: 100%;
  text-align: left;
  color: var(--clr-text);
}
.faq-question:hover { color: var(--clr-secondary); }
.faq-chevron {
  flex-shrink: 0;
  width: 24px; height: 24px;
  border-radius: 50%;
  border: 1px solid var(--clr-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  transition: var(--transition);
  color: var(--clr-text-muted);
}
.faq-item.open .faq-chevron {
  background: var(--clr-primary);
  border-color: var(--clr-primary);
  color: #fff;
  transform: rotate(180deg);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}
.faq-answer-inner {
  padding: 0 1.5rem 1.25rem;
  font-size: 0.95rem;
  color: var(--clr-text-muted);
  line-height: 1.7;
}
.faq-item.open .faq-answer { max-height: 300px; }

/* ── Resources ────────────────────────────────────────────── */
.resource-category {
  margin-bottom: 2.5rem;
}
.resource-category-title {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--clr-border);
}
.resource-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
}
.resource-item {
  background: var(--clr-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: 1.1rem 1.25rem;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}
.resource-item:hover {
  border-color: rgba(0,85,162,0.5);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}
.resource-item-title {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--clr-text);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.resource-item-title::after { content: '↗'; font-size: 0.75rem; color: var(--clr-text-muted); }
.resource-item-desc { font-size: 0.82rem; color: var(--clr-text-muted); }

/* ── Contact ──────────────────────────────────────────────── */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 3rem;
  align-items: start;
}
.contact-info-item {
  display: flex;
  gap: 1rem;
  padding: 1.25rem;
  background: var(--clr-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  margin-bottom: 1rem;
  transition: var(--transition);
}
.contact-info-item:hover { border-color: rgba(0,85,162,0.4); }
.contact-icon {
  width: 44px; height: 44px;
  border-radius: var(--radius-sm);
  background: rgba(0,85,162,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}
.contact-info-label { font-size: 0.8rem; color: var(--clr-text-muted); margin-bottom: 0.2rem; }
.contact-info-value { font-weight: 600; }
.contact-form {
  background: var(--clr-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
}
.form-group { margin-bottom: 1.25rem; }
.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
  color: var(--clr-text-muted);
}
.form-input {
  width: 100%;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  color: var(--clr-text);
  font-family: var(--font-body);
  font-size: 0.95rem;
  transition: var(--transition);
  outline: none;
}
.form-input:focus {
  border-color: var(--clr-primary);
  box-shadow: 0 0 0 3px rgba(0,85,162,0.15);
}
textarea.form-input { resize: vertical; min-height: 130px; }

/* ── Footer ───────────────────────────────────────────────── */
#footer {
  background: var(--clr-card);
  border-top: 1px solid var(--clr-border);
  padding: 4rem 0 2rem;
}
.footer-inner {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: 3rem;
  margin-bottom: 3rem;
}
.footer-brand .footer-logo {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 800;
  background: var(--grad-cta);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.75rem;
}
.footer-brand p {
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 1.25rem;
}
.footer-social {
  display: flex;
  gap: 0.5rem;
}
.footer-social a {
  width: 36px; height: 36px;
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--clr-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  transition: var(--transition);
  color: var(--clr-text-muted);
}
.footer-social a:hover {
  background: rgba(0,85,162,0.2);
  border-color: var(--clr-primary);
  color: var(--clr-text);
}
.footer-col-title {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--clr-text-muted);
  margin-bottom: 1rem;
}
.footer-links { display: flex; flex-direction: column; gap: 0.5rem; }
.footer-links a {
  font-size: 0.9rem;
  color: var(--clr-text-muted);
  transition: var(--transition);
}
.footer-links a:hover { color: var(--clr-secondary); padding-left: 4px; }
.footer-bottom {
  border-top: 1px solid var(--clr-border);
  padding-top: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--clr-text-muted);
}
.footer-bottom a { color: var(--clr-secondary); }

/* ── Page Hero (interior pages) ───────────────────────────── */
.page-hero {
  padding: 8rem 0 4rem;
  position: relative;
  overflow: hidden;
}
.page-hero-bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 70% 60% at 30% 50%, rgba(0,85,162,0.18) 0%, transparent 60%);
}
.page-hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,85,162,0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,85,162,0.08) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(ellipse 100% 100% at 50% 0%, black 40%, transparent 80%);
}
.page-hero-content { position: relative; z-index: 1; }
.page-hero-content h1 { margin-bottom: 0.75rem; }
.page-hero-content p {
  font-size: 1.15rem;
  max-width: 560px;
  line-height: 1.7;
}

/* ── CTA Banner ───────────────────────────────────────────── */
.cta-section {
  background: linear-gradient(135deg, rgba(0,85,162,0.15), rgba(229,168,35,0.1));
  border: 1px solid rgba(0,85,162,0.25);
  border-radius: var(--radius-xl);
  padding: 4rem 2rem;
  text-align: center;
  position: relative;
  overflow: hidden;
  margin: 2rem 0;
}
.cta-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 70% 60% at 50% 50%, rgba(0,85,162,0.12), transparent 70%);
}
.cta-section > * { position: relative; z-index: 1; }
.cta-section h2 { margin-bottom: 1rem; }
.cta-section p  { margin-bottom: 2rem; font-size: 1.1rem; }
.cta-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ── About Page Specifics ─────────────────────────────────── */
.why-join-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
}
.why-join-card {
  background: var(--clr-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  transition: var(--transition);
}
.why-join-card:hover {
  border-color: rgba(0,85,162,0.4);
  transform: translateY(-3px);
}
.why-join-icon { font-size: 2rem; margin-bottom: 0.75rem; }
.why-join-title { font-family: var(--font-heading); font-weight: 700; margin-bottom: 0.4rem; }
.why-join-desc  { font-size: 0.875rem; color: var(--clr-text-muted); }
.about-partner-card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.5rem;
  background: var(--clr-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-bottom: 1.5rem;
  align-items: start;
  transition: var(--transition);
}
.about-partner-card:hover { border-color: rgba(229,168,35,0.3); }
.about-partner-logo {
  width: 80px; height: 80px;
  border-radius: var(--radius-md);
  background: rgba(255,255,255,0.05);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  border: 1px solid var(--clr-border);
}
.about-partner-name { font-family: var(--font-heading); font-size: 1.3rem; font-weight: 700; margin-bottom: 0.5rem; }
.about-partner-desc { font-size: 0.95rem; color: var(--clr-text-muted); line-height: 1.6; }

/* ── Register Page ────────────────────────────────────────── */
.register-info {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-bottom: 3rem;
}
.register-info-card {
  background: var(--clr-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
}
.register-info-card h4 { font-family: var(--font-heading); margin-bottom: 0.75rem; font-size: 1rem; }
.register-info-card ul li {
  font-size: 0.875rem;
  color: var(--clr-text-muted);
  padding: 0.3rem 0;
  padding-left: 1.2rem;
  position: relative;
}
.register-info-card ul li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--clr-secondary);
}
.register-form-container {
  background: var(--clr-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}
.register-form-container h3 { font-family: var(--font-heading); margin-bottom: 0.75rem; }
.register-form-container p { margin-bottom: 2rem; }

/* ── Scroll Animations ────────────────────────────────────── */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── Utilities ────────────────────────────────────────────── */
.text-center { text-align: center; }
.text-gold   { color: var(--clr-secondary); }
.text-blue   { color: var(--clr-primary); }
.mt-1  { margin-top: 0.5rem; }
.mt-2  { margin-top: 1rem; }
.mt-3  { margin-top: 1.5rem; }
.mt-4  { margin-top: 2rem; }
.mb-1  { margin-bottom: 0.5rem; }
.mb-2  { margin-bottom: 1rem; }
.mb-3  { margin-bottom: 1.5rem; }
.mb-4  { margin-bottom: 2rem; }
.divider {
  border: none;
  border-top: 1px solid var(--clr-border);
  margin: 2rem 0;
}

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 768px) {
  .section { padding: 3.5rem 0; }
  .prizes-podium { grid-template-columns: 1fr; }
  .contact-grid  { grid-template-columns: 1fr; }
  .footer-inner  { grid-template-columns: 1fr 1fr; }
  .register-info { grid-template-columns: 1fr; }
  .timeline::before { left: 70px; }
  .timeline-time { min-width: 60px; font-size: 0.75rem; }
  .about-partner-card { grid-template-columns: 1fr; }
  .hero-orb { display: none; }

  /* ── Inline grids that don't use CSS classes ─────────── */
  /* These are targeted via attribute selectors */
  .section-header p { font-size: 1rem; }
  .cta-section { padding: 2.5rem 1.5rem; }
  .page-hero-content h1 { font-size: 2.2rem; }
  .page-hero-content p  { font-size: 1rem; }
}

/* ── 600px: tablet-small / large phones ─────────────────── */
@media (max-width: 600px) {
  /* Nav */
  .nav-logo { font-size: 1.1rem; }

  /* Hero */
  .hero-content { padding: 5rem 0 3rem; text-align: center; }
  .hero-actions { justify-content: center; }
  .hero-stats   { justify-content: center; }

  /* About inline grid → stack */
  [style*="grid-template-columns:1fr 1fr"],
  [style*="grid-template-columns: 1fr 1fr"] {
    grid-template-columns: 1fr !important;
  }

  /* Judges fixed 3-col → 2-col on medium phones */
  [style*="repeat(3,1fr)"] {
    grid-template-columns: repeat(2, 1fr) !important;
  }

  /* Score table: ensure it scrolls */
  .score-table-wrap { -webkit-overflow-scrolling: touch; }

  /* HP Banner flex → column */
  .hp-banner { flex-direction: column; gap: 1rem; padding: 1.5rem; }

  /* Section tags */
  .section-tag { font-size: 0.7rem; }

  /* Countdown */
  .countdown-unit { min-width: 56px; padding: 0.6rem; }
  .countdown-number { font-size: 1.6rem; }
}

@media (max-width: 480px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.6rem; }
  h3 { font-size: 1.3rem; }

  .countdown-number { font-size: 1.8rem; }
  .countdown-unit   { min-width: 64px; padding: 0.75rem; }
  .footer-inner { grid-template-columns: 1fr; }

  /* All generic grids → single column */
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .prizes-podium { grid-template-columns: 1fr; }

  /* All inline grids → single column */
  [style*="grid-template-columns:1fr 1fr"],
  [style*="grid-template-columns: 1fr 1fr"],
  [style*="repeat(3,1fr)"],
  [style*="repeat(2,1fr)"] {
    grid-template-columns: 1fr !important;
  }

  /* Timeline */
  .timeline::before { display: none; }
  .timeline-time { display: none; }

  /* Cards */
  .challenge-card { padding: 1.5rem; }
  .card { padding: 1.25rem; }
  .judge-card { padding: 1.25rem; }

  /* CTA */
  .cta-actions { flex-direction: column; align-items: center; }
  .btn { width: 100%; max-width: 280px; text-align: center; justify-content: center; }

  /* Criteria page */
  .criteria-card { padding: 1.5rem; }
  .hp-banner { padding: 1.25rem; }
  .process-step { padding: 1.25rem; }

  /* Sponsor chips */
  .hp-product-chip { font-size: 0.78rem; }

  /* Section padding */
  .section    { padding: 2.5rem 0; }
  .section-sm { padding: 1.5rem 0; }
}

/* ── HP Visual Identity & Parallax Enhancements ─────────── */

.hp-nav-logo-container {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: white;
  box-shadow: 0 0 10px rgba(255,255,255,0.4), 0 0 4px var(--clr-primary);
  transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  animation: logoPulse 4s ease-in-out infinite alternate;
  flex-shrink: 0;
}
.hp-nav-logo-container:hover {
  transform: rotate(360deg) scale(1.15);
}
.hp-nav-svg {
  width: 26px;
  height: 26px;
}
@keyframes logoPulse {
  0% { box-shadow: 0 0 8px rgba(255,255,255,0.3), 0 0 2px var(--clr-primary); }
  100% { box-shadow: 0 0 18px rgba(0,150,214,0.6), 0 0 6px var(--clr-primary); }
}

/* ── Hero Co-host Logo Strip ─────────────────────────────── */
.hero-cohost-strip {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  margin-top: 0.5rem;
  margin-bottom: 3rem;
  animation: fadeInUp 0.8s ease both;
  animation-delay: 0.2s;
}
.hero-cohost-label {
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--clr-text-muted);
  opacity: 0.8;
}
.hero-cohost-logos {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 60px;
  padding: 1rem 3rem;
  backdrop-filter: blur(8px);
}
.hero-cohost-logo-link {
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.3s ease, opacity 0.3s ease;
  opacity: 0.85;
}
.hero-cohost-logo-link:hover {
  transform: scale(1.08);
  opacity: 1;
}
.hero-cohost-img {
  height: 72px;
  width: auto;
  object-fit: contain;
  filter: brightness(1) saturate(0.9);
  display: block;
}
.hero-cohost-sep {
  font-size: 1.8rem;
  font-weight: 300;
  color: var(--clr-text-muted);
  opacity: 0.5;
  user-select: none;
  line-height: 1;
}

/* Hero Watermark Parallax Layer */
.hero-watermark {
  position: absolute;
  right: -5%;
  top: 12%;
  width: 50%;
  height: 80%;
  /* No container opacity — each child manages its own */
  pointer-events: none;
  z-index: 1;
  transform: translate3d(0, 0, 0);
  will-change: transform;
}

/* HP logo watermark image centered in diagram */
.hero-watermark-logo {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 280px;
  height: 280px;
  border-radius: 50%;
  opacity: 0.10;
  pointer-events: none;
  animation: logoBreath 6s ease-in-out infinite alternate;
}
@keyframes logoBreath {
  from { opacity: 0.07; transform: translate(-50%, -50%) scale(1); }
  to   { opacity: 0.13; transform: translate(-50%, -50%) scale(1.04); }
}

/* Professional HP ZGX Nano inline highlight in tagline */
.hp-brand-highlight {
  color: var(--clr-text);
  font-weight: 500;
  border-bottom: 1px solid rgba(0, 150, 214, 0.45);
  padding-bottom: 1px;
  letter-spacing: 0.01em;
}
@media (max-width: 900px) {
  .hero-watermark { display: none; }
}

/* HP Nano Specs Spotlight */
.hp-nano-specs-card {
  position: relative;
  border: 1px solid rgba(0, 150, 214, 0.25) !important;
  box-shadow: 0 8px 32px rgba(0, 85, 162, 0.15);
  transition: all 0.45s cubic-bezier(0.16, 1, 0.3, 1) !important;
  overflow: hidden;
  background: rgba(13,27,46,0.6) !important;
}
.hp-nano-specs-card::after {
  content: '';
  position: absolute;
  top: -50%; left: -50%;
  width: 200%; height: 200%;
  background: linear-gradient(45deg, transparent 45%, rgba(0, 150, 214, 0.1) 50%, transparent 55%);
  transform: rotate(45deg);
  transition: transform 0.8s ease-in-out;
  pointer-events: none;
}
.hp-nano-specs-card:hover {
  border-color: rgba(0, 150, 214, 0.6) !important;
  box-shadow: 0 12px 40px rgba(0, 150, 214, 0.35), 0 0 20px rgba(0, 150, 214, 0.2);
  transform: translateY(-4px);
}
.hp-nano-specs-card:hover::after {
  transform: translate(50%, 50%) rotate(45deg);
}

.hp-nano-specs-card [style*="grid-template-columns"] div {
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.3s ease, background 0.3s ease;
  border: 1px solid var(--clr-border);
}
.hp-nano-specs-card [style*="grid-template-columns"] div:hover {
  transform: scale(1.04);
  border-color: rgba(0, 150, 214, 0.5) !important;
  background: rgba(0, 85, 162, 0.18) !important;
}