/* =============================================================
   RoboSeekho National Innovation Challenge 2026 — microsite theme
   Used by competition.html and register.html only.
============================================================= */

:root {
  --rc-bg: #060b1e;
  --rc-bg-soft: #0a1230;
  --rc-bg-alt: #0d1740;
  --rc-surface: rgba(255, 255, 255, 0.05);
  --rc-surface-strong: rgba(255, 255, 255, 0.09);
  --rc-border: rgba(255, 255, 255, 0.1);
  --rc-text: #eef2fb;
  --rc-text-dim: #a8b1cc;
  --rc-text-faint: #6d7699;

  --rc-blue: #2f6fed;
  --rc-blue-light: #5b9dff;
  --rc-cyan: #22d3ee;
  --rc-gold: #f5b301;
  --rc-silver: #c7ccd6;
  --rc-bronze: #d97b3f;

  --rc-grad-brand: linear-gradient(135deg, var(--rc-blue) 0%, var(--rc-cyan) 100%);
  --rc-grad-text: linear-gradient(90deg, #8fb3ff, #6ee7f5);

  --rc-radius-sm: 10px;
  --rc-radius-md: 16px;
  --rc-radius-lg: 26px;
  --rc-shadow: 0 24px 70px -25px rgba(0, 0, 0, 0.6);
  --rc-shadow-glow: 0 0 0 1px rgba(255, 255, 255, 0.06), 0 20px 60px -20px rgba(47, 111, 237, 0.4);
  --rc-ease: cubic-bezier(.22, 1, .36, 1);
  color-scheme: dark;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { overflow-x: hidden; }
body.rc {
  background: var(--rc-bg);
  color: var(--rc-text);
  font-family: 'Inter', system-ui, sans-serif;
  line-height: 1.6;
  overflow-x: hidden;
  max-width: 100vw;
  -webkit-font-smoothing: antialiased;
}

.rc h1, .rc h2, .rc h3, .rc h4 {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.01em;
}

.rc a { color: inherit; text-decoration: none; }
.rc ul { list-style: none; }
.rc img { max-width: 100%; display: block; }
.rc button { font: inherit; cursor: pointer; }
.rc input, .rc select, .rc textarea { font: inherit; }

.rc .container {
  width: min(1200px, 92%);
  margin-inline: auto;
}

/* ---------- scroll progress ---------- */
.rc-scroll-progress {
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  width: 0%;
  background: var(--rc-grad-brand);
  z-index: 999;
  transition: width 0.1s linear;
}

/* ---------- buttons ---------- */
.rc-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.6rem;
  border-radius: 100px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  transition: transform 0.25s var(--rc-ease), box-shadow 0.25s var(--rc-ease), background 0.25s var(--rc-ease);
  white-space: nowrap;
}
.rc-btn-primary {
  background: var(--rc-grad-brand);
  color: #051021;
  box-shadow: 0 12px 30px -10px rgba(47, 111, 237, 0.55);
}
.rc-btn-primary:hover { transform: translateY(-2px); box-shadow: 0 18px 40px -12px rgba(47, 111, 237, 0.7); }
.rc-btn-ghost {
  background: rgba(255, 255, 255, 0.04);
  border-color: var(--rc-border);
  color: var(--rc-text);
  backdrop-filter: blur(10px);
}
.rc-btn-ghost:hover { background: rgba(255, 255, 255, 0.09); transform: translateY(-2px); }
.rc-btn-block { width: 100%; }
.rc-btn[disabled] { opacity: 0.6; cursor: not-allowed; transform: none !important; }

/* ---------- header ---------- */
.rc-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(6, 11, 30, 0.75);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--rc-border);
}
.rc-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 0;
}
.rc-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 1.15rem;
}
.rc-brand img { width: 34px; height: 34px; border-radius: 8px; }
.rc-brand span.accent { background: var(--rc-grad-text); -webkit-background-clip: text; background-clip: text; color: transparent; }

.rc-nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}
.rc-nav-link {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--rc-text-dim);
  transition: color 0.2s;
  position: relative;
}
.rc-nav-link:hover, .rc-nav-link.active { color: var(--rc-text); }
.rc-nav-link.active::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: -10px;
  height: 2px;
  background: var(--rc-grad-brand);
  border-radius: 2px;
}

.rc-nav-actions { display: flex; align-items: center; gap: 0.9rem; }
.rc-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: 6px;
}
.rc-hamburger span { width: 22px; height: 2px; background: var(--rc-text); border-radius: 2px; transition: transform 0.25s, opacity 0.25s; }

/* ---------- hero ---------- */
.rc-hero {
  position: relative;
  padding: 5rem 0 4rem;
  overflow: hidden;
  background:
    radial-gradient(circle at 15% 20%, rgba(47, 111, 237, 0.25), transparent 45%),
    radial-gradient(circle at 85% 10%, rgba(34, 211, 238, 0.18), transparent 40%),
    var(--rc-bg);
}
.rc-hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.035) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
  pointer-events: none;
}
.rc-hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3rem;
  align-items: center;
}
.rc-eyebrow {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--rc-cyan);
  margin-bottom: 1.1rem;
}
.rc-hero h1 {
  font-size: clamp(2rem, 4.4vw, 3.4rem);
  margin-bottom: 1rem;
}
.rc-hero h1 .grad { background: var(--rc-grad-text); -webkit-background-clip: text; background-clip: text; color: transparent; }
.rc-hero-sub {
  font-size: 1.05rem;
  color: var(--rc-text-dim);
  max-width: 46ch;
  margin-bottom: 1.75rem;
}
.rc-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-bottom: 2rem;
}
.rc-hero-meta-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--rc-text-dim);
}
.rc-hero-meta-item .ico { font-size: 1.1rem; }
.rc-hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; }

.rc-hero-visual {
  position: relative;
  min-height: 380px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.rc-orb-stage {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  max-width: 380px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, rgba(91, 157, 255, 0.35), transparent 60%),
              rgba(255, 255, 255, 0.03);
  border: 1px solid var(--rc-border);
  display: flex;
  align-items: center;
  justify-content: center;
  animation: rc-float 6s ease-in-out infinite;
}
.rc-orb-stage svg { width: 55%; height: 55%; opacity: 0.9; }
@keyframes rc-float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-14px); } }

.rc-chip {
  position: absolute;
  background: rgba(10, 18, 48, 0.85);
  border: 1px solid var(--rc-border);
  backdrop-filter: blur(14px);
  border-radius: var(--rc-radius-md);
  padding: 0.75rem 1rem;
  font-size: 0.82rem;
  box-shadow: var(--rc-shadow);
  animation: rc-chip-float 5s ease-in-out infinite;
}
.rc-chip strong { display: block; font-size: 0.95rem; }
.rc-chip span { color: var(--rc-text-dim); font-size: 0.75rem; }
.rc-chip-1 { top: 6%; left: -6%; animation-delay: 0s; }
.rc-chip-2 { bottom: 10%; left: -10%; animation-delay: 1.2s; }
.rc-chip-3 { bottom: -4%; right: -4%; animation-delay: 2.4s; }
@keyframes rc-chip-float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }

.rc-stat-card {
  position: absolute;
  top: -8%;
  right: -12%;
  width: 200px;
  background: rgba(6, 11, 30, 0.9);
  border: 1px solid var(--rc-border);
  backdrop-filter: blur(16px);
  border-radius: var(--rc-radius-md);
  padding: 1.1rem;
  box-shadow: var(--rc-shadow);
}
.rc-stat-row {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.5rem 0;
}
.rc-stat-row + .rc-stat-row { border-top: 1px solid var(--rc-border); }
.rc-stat-row .ico {
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  background: var(--rc-surface-strong);
  border-radius: 8px;
  font-size: 1rem;
}
.rc-stat-row strong { display: block; font-size: 0.95rem; }
.rc-stat-row span { font-size: 0.72rem; color: var(--rc-text-dim); }

/* ---------- section shell ---------- */
.rc-section { padding: 5.5rem 0; }
.rc-section-alt { background: var(--rc-bg-soft); }
.rc-section-dark { background: var(--rc-bg-alt); }
.rc-section-head { max-width: 640px; margin-bottom: 3rem; }
.rc-section-head.center { margin-inline: auto; text-align: center; }
.rc-eyebrow-sm {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--rc-blue-light);
  margin-bottom: 0.75rem;
}
.rc-section-head h2 { font-size: clamp(1.6rem, 3vw, 2.3rem); margin-bottom: 0.75rem; }
.rc-section-head p { color: var(--rc-text-dim); }

/* reveal-on-scroll */
[data-rc-reveal] { opacity: 0; transform: translateY(24px); transition: opacity 0.7s var(--rc-ease), transform 0.7s var(--rc-ease); }
[data-rc-reveal].rc-in { opacity: 1; transform: translateY(0); }

/* ---------- about ---------- */
.rc-about-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3rem;
  align-items: start;
}
.rc-about-copy p { color: var(--rc-text-dim); margin-bottom: 1rem; }
.rc-area-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem;
}
.rc-area-card {
  background: var(--rc-surface);
  border: 1px solid var(--rc-border);
  border-radius: var(--rc-radius-sm);
  padding: 1.1rem 0.9rem;
  text-align: center;
  transition: transform 0.25s var(--rc-ease), border-color 0.25s var(--rc-ease);
}
.rc-area-card:hover { transform: translateY(-4px); border-color: rgba(91, 157, 255, 0.4); }
.rc-area-card .ico { font-size: 1.6rem; margin-bottom: 0.5rem; }
.rc-area-card strong { font-size: 0.85rem; font-weight: 600; }

/* ---------- timeline ---------- */
.rc-timeline {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 1.5rem;
  position: relative;
}
.rc-timeline::before {
  content: '';
  position: absolute;
  top: 22px;
  left: 10%;
  right: 10%;
  height: 2px;
  background: linear-gradient(90deg, var(--rc-blue), var(--rc-cyan));
  opacity: 0.4;
}
.rc-timeline-item { position: relative; text-align: center; }
.rc-timeline-dot {
  width: 46px; height: 46px;
  margin: 0 auto 1rem;
  border-radius: 50%;
  background: var(--rc-grad-brand);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem;
  box-shadow: 0 0 0 6px var(--rc-bg-alt);
  position: relative;
  z-index: 1;
}
.rc-timeline-item strong { display: block; font-size: 0.9rem; margin-bottom: 0.25rem; }
.rc-timeline-item span { font-size: 0.8rem; color: var(--rc-text-dim); }

/* ---------- prizes ---------- */
.rc-prize-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}
.rc-prize-card {
  border-radius: var(--rc-radius-md);
  padding: 2rem 1.5rem;
  text-align: center;
  border: 1px solid var(--rc-border);
}
.rc-prize-card .medal { font-size: 2.2rem; margin-bottom: 0.75rem; }
.rc-prize-card .amount { font-size: 1.8rem; font-family: 'Space Grotesk', sans-serif; font-weight: 700; }
.rc-prize-card .label { color: var(--rc-text-dim); font-size: 0.85rem; margin-top: 0.25rem; }
.rc-prize-1 { background: linear-gradient(160deg, rgba(245, 179, 1, 0.18), rgba(245, 179, 1, 0.04)); border-color: rgba(245, 179, 1, 0.35); }
.rc-prize-2 { background: linear-gradient(160deg, rgba(199, 204, 214, 0.16), rgba(199, 204, 214, 0.03)); border-color: rgba(199, 204, 214, 0.3); }
.rc-prize-3 { background: linear-gradient(160deg, rgba(217, 123, 63, 0.16), rgba(217, 123, 63, 0.03)); border-color: rgba(217, 123, 63, 0.3); }

.rc-award-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
}
.rc-award-card {
  background: var(--rc-surface);
  border: 1px solid var(--rc-border);
  border-radius: var(--rc-radius-sm);
  padding: 1.25rem 1rem;
  text-align: center;
  font-size: 0.85rem;
  font-weight: 600;
}
.rc-award-card .ico { font-size: 1.5rem; margin-bottom: 0.5rem; }

.rc-qualifier-note {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: 1.5rem;
  padding: 1.1rem 1.4rem;
  border-radius: var(--rc-radius-sm);
  background: linear-gradient(135deg, rgba(47, 111, 237, 0.12), rgba(34, 211, 238, 0.08));
  border: 1px solid rgba(91, 157, 255, 0.3);
}
.rc-qualifier-note .ico { font-size: 1.6rem; flex-shrink: 0; }
.rc-qualifier-note p { font-size: 0.9rem; color: var(--rc-text-dim); margin: 0; }
.rc-qualifier-note strong { color: var(--rc-text); }

/* ---------- school prizes ---------- */
.rc-school-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1.25rem;
}
.rc-school-card {
  background: var(--rc-surface);
  border: 1px solid var(--rc-border);
  border-radius: var(--rc-radius-md);
  padding: 1.75rem 1.4rem;
  text-align: center;
  transition: transform 0.25s var(--rc-ease), border-color 0.25s var(--rc-ease);
}
.rc-school-card:hover { transform: translateY(-4px); border-color: rgba(91, 157, 255, 0.4); }
.rc-school-card .ico {
  width: 54px; height: 54px;
  margin: 0 auto 1rem;
  border-radius: 50%;
  background: var(--rc-grad-brand);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem;
}
.rc-school-card h3 { font-size: 0.98rem; margin-bottom: 0.5rem; line-height: 1.3; }
.rc-school-card p { font-size: 0.8rem; color: var(--rc-text-dim); }

/* ---------- eligibility ---------- */
.rc-elig-grid {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 1rem;
}
.rc-elig-card {
  background: var(--rc-surface);
  border: 1px solid var(--rc-border);
  border-radius: var(--rc-radius-sm);
  padding: 1.25rem 0.5rem;
  text-align: center;
}
.rc-elig-card .ico { font-size: 1.4rem; margin-bottom: 0.5rem; }
.rc-elig-card strong { font-size: 0.8rem; }

/* ---------- process ---------- */
.rc-process-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 1.5rem;
}
.rc-process-card {
  background: var(--rc-surface);
  border: 1px solid var(--rc-border);
  border-radius: var(--rc-radius-md);
  padding: 1.5rem 1.1rem;
  position: relative;
}
.rc-process-num {
  width: 34px; height: 34px;
  border-radius: 50%;
  background: var(--rc-grad-brand);
  color: #051021;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
  margin-bottom: 1rem;
}
.rc-process-card h3 { font-size: 1rem; margin-bottom: 0.4rem; }
.rc-process-card p { font-size: 0.8rem; color: var(--rc-text-dim); }

/* ---------- FAQ ---------- */
.rc-faq-list { max-width: 780px; margin: 0 auto; }
.rc-faq-item {
  border: 1px solid var(--rc-border);
  border-radius: var(--rc-radius-sm);
  margin-bottom: 0.9rem;
  overflow: hidden;
  background: var(--rc-surface);
}
.rc-faq-q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem 1.4rem;
  background: none;
  border: none;
  color: var(--rc-text);
  font-weight: 600;
  font-size: 0.95rem;
  text-align: left;
}
.rc-faq-q .plus { transition: transform 0.3s var(--rc-ease); font-size: 1.2rem; color: var(--rc-blue-light); }
.rc-faq-item.open .rc-faq-q .plus { transform: rotate(45deg); }
.rc-faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s var(--rc-ease);
  padding: 0 1.4rem;
}
.rc-faq-a p { padding-bottom: 1.1rem; color: var(--rc-text-dim); font-size: 0.9rem; }
.rc-faq-item.open .rc-faq-a { max-height: 220px; }

/* ---------- CTA band ---------- */
.rc-cta-band {
  border-radius: var(--rc-radius-lg);
  padding: 3rem;
  text-align: center;
  background: var(--rc-grad-brand);
  color: #051021;
}
.rc-cta-band h2 { margin-bottom: 0.5rem; }
.rc-cta-band p { color: rgba(5, 16, 33, 0.75); margin-bottom: 1.5rem; }
.rc-cta-band .rc-btn-ghost { background: rgba(5, 16, 33, 0.12); border-color: rgba(5, 16, 33, 0.25); color: #051021; }

/* ---------- footer ---------- */
.rc-footer { background: var(--rc-bg); border-top: 1px solid var(--rc-border); padding: 3.5rem 0 1.5rem; }
.rc-footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 2.5rem;
  margin-bottom: 2.5rem;
}
.rc-footer-brand p { color: var(--rc-text-dim); font-size: 0.88rem; margin-top: 0.9rem; max-width: 32ch; }
.rc-footer-col h4 { font-size: 0.85rem; margin-bottom: 1rem; text-transform: uppercase; letter-spacing: 0.06em; }
.rc-footer-col a { display: block; color: var(--rc-text-dim); font-size: 0.9rem; margin-bottom: 0.6rem; transition: color 0.2s; }
.rc-footer-col a:hover { color: var(--rc-text); }
.rc-social { display: flex; gap: 0.7rem; margin-top: 1rem; }
.rc-social a {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--rc-surface);
  border: 1px solid var(--rc-border);
  display: flex; align-items: center; justify-content: center;
}
.rc-footer-bottom {
  border-top: 1px solid var(--rc-border);
  padding-top: 1.5rem;
  font-size: 0.8rem;
  color: var(--rc-text-faint);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

/* ---------- back to top ---------- */
.rc-back-top {
  position: fixed;
  bottom: 1.8rem;
  right: 1.8rem;
  width: 46px; height: 46px;
  border-radius: 50%;
  background: var(--rc-grad-brand);
  color: #051021;
  border: none;
  display: flex; align-items: center; justify-content: center;
  box-shadow: var(--rc-shadow-glow);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
  z-index: 90;
}
.rc-back-top.show { opacity: 1; pointer-events: auto; }

/* =============================================================
   Registration form (register.html)
============================================================= */
.rc-reg-hero {
  padding: 3rem 0 2rem;
  text-align: center;
  background: radial-gradient(circle at 50% 0%, rgba(47, 111, 237, 0.22), transparent 60%), var(--rc-bg);
}
.rc-reg-hero h1 { font-size: clamp(1.6rem, 3.4vw, 2.4rem); margin-bottom: 0.6rem; }
.rc-reg-hero p { color: var(--rc-text-dim); max-width: 52ch; margin: 0 auto; }

.rc-progress-steps {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 2rem;
  flex-wrap: wrap;
}
.rc-progress-step {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.78rem;
  color: var(--rc-text-faint);
  padding: 0.4rem 0.9rem 0.4rem 0.4rem;
  border-radius: 100px;
  border: 1px solid var(--rc-border);
}
.rc-progress-step .n {
  width: 22px; height: 22px;
  border-radius: 50%;
  background: var(--rc-surface-strong);
  display: flex; align-items: center; justify-content: center;
  font-weight: 700;
  font-size: 0.72rem;
}
.rc-progress-step.done { color: var(--rc-text); border-color: rgba(91, 157, 255, 0.4); }
.rc-progress-step.done .n { background: var(--rc-grad-brand); color: #051021; }

.rc-form-wrap { padding: 3rem 0 6rem; }
.rc-form-card {
  max-width: 820px;
  margin: 0 auto;
  background: var(--rc-surface);
  border: 1px solid var(--rc-border);
  border-radius: var(--rc-radius-lg);
  padding: clamp(1.5rem, 4vw, 3rem);
  backdrop-filter: blur(10px);
}
.rc-form-section { margin-bottom: 2.2rem; }
.rc-form-section-title {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  font-size: 1.05rem;
  margin-bottom: 1.3rem;
  padding-bottom: 0.8rem;
  border-bottom: 1px solid var(--rc-border);
}
.rc-form-section-title .badge {
  width: 28px; height: 28px;
  border-radius: 50%;
  background: var(--rc-grad-brand);
  color: #051021;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
}
.rc-form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.1rem;
}
.rc-field { margin-bottom: 1.1rem; }
.rc-field label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.45rem;
  color: var(--rc-text-dim);
}
.rc-field label .req { color: #f87171; }
.rc-field input[type="text"],
.rc-field input[type="tel"],
.rc-field input[type="email"],
.rc-field input[type="url"],
.rc-field input[type="date"],
.rc-field select,
.rc-field textarea {
  width: 100%;
  padding: 0.8rem 1rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--rc-border);
  border-radius: var(--rc-radius-sm);
  color: var(--rc-text);
  transition: border-color 0.2s, background 0.2s;
}
.rc-field select { color-scheme: dark; }
.rc-field select option {
  background: var(--rc-bg-alt);
  color: var(--rc-text);
}
.rc-field input:focus, .rc-field select:focus, .rc-field textarea:focus {
  outline: none;
  border-color: var(--rc-blue-light);
  background: rgba(255, 255, 255, 0.06);
}
.rc-field textarea { resize: vertical; min-height: 90px; }
.rc-field .rc-error {
  display: none;
  color: #f87171;
  font-size: 0.78rem;
  margin-top: 0.35rem;
}
.rc-field.rc-invalid input,
.rc-field.rc-invalid select,
.rc-field.rc-invalid textarea { border-color: #f87171; }
.rc-field.rc-invalid .rc-error { display: block; }

.rc-check-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.7rem;
}
.rc-check-option {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.7rem 0.9rem;
  border: 1px solid var(--rc-border);
  border-radius: var(--rc-radius-sm);
  font-size: 0.85rem;
  background: rgba(255, 255, 255, 0.03);
  cursor: pointer;
}
.rc-check-option input { accent-color: var(--rc-blue); width: 16px; height: 16px; flex-shrink: 0; }
.rc-check-option:has(input:checked),
.rc-check-option.rc-selected {
  border-color: var(--rc-blue-light);
  background: rgba(91, 157, 255, 0.12);
}
.rc-check-grid.rc-invalid .rc-check-option { border-color: #f87171; }
#interestsError { color: #f87171; font-size: 0.78rem; }

.rc-check-inline {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.78rem;
  color: var(--rc-text-dim);
  margin-top: 0.5rem;
  cursor: pointer;
}
.rc-check-inline input { accent-color: var(--rc-blue); width: 14px; height: 14px; }
.rc-field input[readonly] { opacity: 0.6; cursor: not-allowed; }

.rc-radio-row { display: flex; gap: 1.5rem; }
.rc-radio-option { display: flex; align-items: center; gap: 0.5rem; font-size: 0.9rem; cursor: pointer; }
.rc-radio-option input { accent-color: var(--rc-blue); width: 16px; height: 16px; }

.rc-agree {
  display: flex;
  align-items: flex-start;
  gap: 0.7rem;
  font-size: 0.85rem;
  color: var(--rc-text-dim);
  margin-bottom: 1.5rem;
}
.rc-agree input { margin-top: 0.2rem; accent-color: var(--rc-blue); width: 16px; height: 16px; }
.rc-agree a { color: var(--rc-blue-light); text-decoration: underline; }
.rc-agree.rc-invalid { color: #f87171; }
.rc-agree.rc-invalid input { outline: 1px solid #f87171; outline-offset: 2px; }
#agreeError { color: #f87171; font-size: 0.78rem; margin-top: -1rem; margin-bottom: 1.5rem; }

.rc-submit-row { display: flex; flex-direction: column; align-items: center; gap: 0.8rem; }
.rc-form-banner {
  display: none;
  border-radius: var(--rc-radius-sm);
  padding: 0.9rem 1.1rem;
  font-size: 0.88rem;
  margin-bottom: 1.5rem;
}
.rc-form-banner.show { display: block; }
.rc-form-banner.error { background: rgba(248, 113, 113, 0.12); border: 1px solid rgba(248, 113, 113, 0.35); color: #fca5a5; }

.rc-spinner {
  width: 16px; height: 16px;
  border-radius: 50%;
  border: 2px solid rgba(5, 16, 33, 0.3);
  border-top-color: #051021;
  animation: rc-spin 0.7s linear infinite;
  display: none;
}
.rc-btn.loading .rc-spinner { display: inline-block; }
.rc-btn.loading .rc-btn-label { opacity: 0.7; }
@keyframes rc-spin { to { transform: rotate(360deg); } }

/* success modal */
.rc-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(3, 7, 20, 0.75);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  z-index: 200;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
}
.rc-modal-overlay.show { opacity: 1; pointer-events: auto; }
.rc-modal {
  background: var(--rc-bg-alt);
  border: 1px solid var(--rc-border);
  border-radius: var(--rc-radius-lg);
  padding: 2.5rem;
  max-width: 440px;
  width: 100%;
  text-align: center;
  transform: translateY(20px) scale(0.97);
  transition: transform 0.35s var(--rc-ease);
  box-shadow: var(--rc-shadow);
}
.rc-modal-overlay.show .rc-modal { transform: translateY(0) scale(1); }
.rc-modal-icon {
  width: 72px; height: 72px;
  margin: 0 auto 1.2rem;
  border-radius: 50%;
  background: rgba(34, 211, 238, 0.12);
  border: 2px solid var(--rc-cyan);
  display: flex; align-items: center; justify-content: center;
}
.rc-modal-icon svg { width: 32px; height: 32px; stroke: var(--rc-cyan); }
.rc-modal h3 { font-size: 1.3rem; margin-bottom: 0.6rem; }
.rc-modal p { color: var(--rc-text-dim); font-size: 0.9rem; margin-bottom: 1rem; }
.rc-reg-id-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}
.rc-reg-id {
  display: inline-block;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 1.15rem;
  background: var(--rc-surface-strong);
  border: 1px dashed var(--rc-blue-light);
  padding: 0.6rem 1.2rem;
  border-radius: var(--rc-radius-sm);
  letter-spacing: 0.03em;
}
.rc-copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--rc-surface);
  border: 1px solid var(--rc-border);
  color: var(--rc-text-dim);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 0.55rem 0.85rem;
  border-radius: var(--rc-radius-sm);
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}
.rc-copy-btn:hover { border-color: var(--rc-blue-light); color: var(--rc-text); }
.rc-copy-btn.copied { border-color: var(--rc-cyan); color: var(--rc-cyan); }
.rc-modal-actions { display: flex; gap: 0.8rem; justify-content: center; flex-wrap: wrap; }

/* =============================================================
   Responsive
============================================================= */
@media (max-width: 980px) {
  .rc-nav-links {
    position: fixed;
    top: 64px;
    left: 0; right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: rgba(6, 11, 30, 0.97);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--rc-border);
    padding: 0.5rem 6%;
    transform: translateY(-120%);
    opacity: 0;
    transition: transform 0.3s var(--rc-ease), opacity 0.3s var(--rc-ease);
    pointer-events: none;
  }
  .rc-nav-links.rc-open { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .rc-nav-links .rc-nav-link { display: block; padding: 0.9rem 0; width: 100%; border-bottom: 1px solid var(--rc-border); }
  .rc-hamburger { display: flex; }
  .rc-hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .rc-hamburger.active span:nth-child(2) { opacity: 0; }
  .rc-hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  .rc-hero-inner { grid-template-columns: 1fr; }
  .rc-hero-visual { min-height: 0; order: -1; padding: 2.5rem 0 1rem; flex-wrap: wrap; }
  .rc-chip { display: none; }
  .rc-stat-card { position: static; width: 100%; max-width: 320px; margin: 1.5rem auto 0; }
  .rc-about-grid { grid-template-columns: 1fr; }
  .rc-timeline { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .rc-timeline::before { display: none; }
  .rc-prize-grid { grid-template-columns: 1fr; }
  .rc-award-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .rc-school-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .rc-elig-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .rc-process-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .rc-footer-grid { grid-template-columns: 1fr; gap: 2rem; }
  .rc-form-row { grid-template-columns: 1fr; }
  .rc-check-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 560px) {
  .rc-section { padding: 3.5rem 0; }
  .rc-area-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .rc-elig-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .rc-award-grid { grid-template-columns: 1fr 1fr; }
  .rc-school-grid { grid-template-columns: 1fr; }
  .rc-qualifier-note { flex-direction: column; text-align: center; }
  .rc-radio-row { flex-direction: column; gap: 0.6rem; }
}