/* ============================================================
   ART DIRECTION: Deep Space Science
   Palette: Dark navy + Temple Cherry #9d2235 + Quantum Teal #00d4d4
   Typography: Space Grotesk (display) + Inter (body)
   Density: Spacious hero, balanced sections
   ============================================================ */

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

:root {
  /* Surfaces */
  --color-bg:           #070c1a;
  --color-surface:      #0d1428;
  --color-surface-2:    #111b35;
  --color-surface-3:    #162040;
  --color-border:       rgba(255,255,255,0.08);
  --color-divider:      rgba(255,255,255,0.05);

  /* Text */
  --color-text:         #e8eaf0;
  --color-text-muted:   #8892a4;
  --color-text-faint:   #4a5568;
  --color-text-inverse: #070c1a;

  /* Accent: Temple Cherry */
  --color-cherry:       #9d2235;
  --color-cherry-light: #c4334a;
  --color-cherry-glow:  rgba(157,34,53,0.25);

  /* Accent: Quantum Teal */
  --color-teal:         #00d4d4;
  --color-teal-dim:     #00a8a8;
  --color-teal-glow:    rgba(0,212,212,0.15);

  /* Type scale */
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);
  --text-3xl:  clamp(2.5rem,   1rem    + 4vw,    5rem);
  --text-hero: clamp(3rem,     0.5rem  + 7vw,    8rem);

  /* Spacing */
  --space-1:  0.25rem;  --space-2:  0.5rem;   --space-3:  0.75rem;
  --space-4:  1rem;     --space-5:  1.25rem;  --space-6:  1.5rem;
  --space-8:  2rem;     --space-10: 2.5rem;   --space-12: 3rem;
  --space-16: 4rem;     --space-20: 5rem;     --space-24: 6rem;

  /* Radius */
  --radius-sm: 0.375rem;  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;   --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.4);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.5);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.6);
  --shadow-teal: 0 0 30px rgba(0,212,212,0.2);
  --shadow-cherry: 0 0 30px rgba(157,34,53,0.3);

  /* Fonts */
  --font-display: 'Space Grotesk', 'Helvetica Neue', sans-serif;
  --font-body:    'Inter', 'Helvetica Neue', sans-serif;

  /* Layout */
  --content-narrow:  640px;
  --content-default: 960px;
  --content-wide:    1200px;

  --transition: 200ms cubic-bezier(0.16,1,0.3,1);
}

/* ── Reset ─────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; -webkit-font-smoothing: antialiased; }
body { min-height: 100dvh; font-family: var(--font-body); font-size: var(--text-base); color: var(--color-text); background: var(--color-bg); line-height: 1.6; }
img, picture, video, canvas, svg { display: block; max-width: 100%; height: auto; }
h1,h2,h3,h4,h5,h6 { font-family: var(--font-display); text-wrap: balance; line-height: 1.15; }
p, li { text-wrap: pretty; }
input, button, textarea, select { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: none; }
ul { list-style: none; }
a { color: inherit; text-decoration: none; }

/* ── Container ──────────────────────────────────────────────── */
.container { max-width: var(--content-wide); margin-inline: auto; padding-inline: var(--space-6); }
.container--narrow { max-width: var(--content-default); margin-inline: auto; padding-inline: var(--space-6); }

/* ── Utility ────────────────────────────────────────────────── */
.sr-only { position:absolute; width:1px; height:1px; padding:0; margin:-1px; overflow:hidden; clip:rect(0,0,0,0); border:0; }
.text-teal   { color: var(--color-teal); }
.text-cherry { color: var(--color-cherry-light); }
.text-muted  { color: var(--color-text-muted); }

/* ── Buttons ────────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: var(--space-2);
  padding: var(--space-3) var(--space-6); border-radius: var(--radius-full);
  font-family: var(--font-display); font-weight: 600; font-size: var(--text-sm);
  letter-spacing: 0.03em; transition: all var(--transition); white-space: nowrap;
}
.btn-primary {
  background: var(--color-cherry); color: #fff;
  box-shadow: 0 0 0 0 var(--color-cherry-glow);
}
.btn-primary:hover {
  background: var(--color-cherry-light);
  box-shadow: 0 0 20px var(--color-cherry-glow), 0 4px 16px rgba(157,34,53,0.4);
  transform: translateY(-1px);
}
.btn-outline {
  background: transparent; color: var(--color-teal);
  border: 1.5px solid var(--color-teal);
}
.btn-outline:hover {
  background: var(--color-teal-glow);
  box-shadow: var(--shadow-teal);
  transform: translateY(-1px);
}

/* ── NAVIGATION ─────────────────────────────────────────────── */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(254, 254, 255, 0.6);
  backdrop-filter: blur(16px) saturate(1.5);
  -webkit-backdrop-filter: blur(16px) saturate(1.5);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition), box-shadow var(--transition);
}
.site-header.scrolled {
  background: rgba(254, 254, 255, 0.6);
  box-shadow: 0 4px 24px rgba(0,0,0,0.5);
}
.nav-container {
  max-width: var(--content-wide); margin-inline: auto;
  padding: var(--space-3) var(--space-6);
  display: flex; align-items: center; justify-content: space-between; gap: var(--space-4);
}
.nav-logos {
    display: flex;
    align-items: center;
    gap: var(--space-6);
    /* background: rgba(255, 255, 255, 0.92); */
    /* border-radius: var(--radius-full); */
    padding: 6px 16px;
}
.nav-logo   { height: 40px; width: auto; filter: none; object-fit: contain; opacity: 1.3; transition: opacity var(--transition); }
.nav-logo:hover { opacity: 0.7; }
.main-nav   { display: flex; align-items: center; gap: var(--space-2); }
.main-nav a {
  position: relative; padding: var(--space-2) var(--space-3);
  font-family: var(--font-display); font-size: var(--text-sm); font-weight: 500;
  color: #1a202c; transition: color var(--transition);
}
.main-nav a::after {
  content: ''; position: absolute; bottom: 0; left: var(--space-3); right: var(--space-3);
  height: 2px; background: var(--color-teal); transform: scaleX(0);
  transition: transform var(--transition); border-radius: var(--radius-full);
}
.main-nav a:hover { color: var(--color-text); }
.main-nav a:hover::after, .main-nav a.active::after { transform: scaleX(1); }
.main-nav a.active { color: var(--color-text); }
.btn-register {
  background: var(--color-cherry); color: #f4f9fa !important;
  padding: var(--space-2) var(--space-5) !important;
  border-radius: var(--radius-full); font-weight: 600 !important;
  font-family: var(--font-display) !important;
  transition: all var(--transition) !important;
}
.btn-register::after { display: none !important; }
.btn-register:hover { background: var(--color-cherry-light) !important; transform: translateY(-1px); box-shadow: 0 4px 16px rgba(157,34,53,0.4) !important; }

/* ── PAGE HEADER (inner pages) ──────────────────────────────── */
.page-header {
  padding: calc(80px + var(--space-16)) var(--space-6) var(--space-12);
  background: linear-gradient(180deg, var(--color-surface) 0%, var(--color-bg) 100%);
  border-bottom: 1px solid var(--color-border); text-align: center; position: relative; overflow: hidden;
}
.page-header::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(ellipse 60% 80% at 50% 0%, rgba(0,212,212,0.06) 0%, transparent 70%);
  pointer-events: none;
}
.page-header h1 { font-size: var(--text-2xl); color: var(--color-text); margin-bottom: var(--space-3); }
.page-header p  { color: var(--color-text-muted); font-size: var(--text-lg); }

/* ── SECTION ────────────────────────────────────────────────── */
.section { padding-block: clamp(var(--space-12), 8vw, var(--space-24)); }
.section-label {
  display: inline-flex; align-items: center; gap: var(--space-2);
  font-size: var(--text-xs); font-weight: 600; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--color-teal); margin-bottom: var(--space-4);
}
.section-label::before { content: ''; display: block; width: 20px; height: 1.5px; background: var(--color-teal); }
.section-title { font-size: var(--text-xl); color: var(--color-text); margin-bottom: var(--space-4); }
.section-body  { color: var(--color-text-muted); max-width: 65ch; font-size: var(--text-base); line-height: 1.7; }

.sponsor-logos {
    display: flex;
    align-items: center;
    justify-content: center;   /* ← centers the whole row */
    gap: var(--space-6);
    flex-wrap: wrap;
    margin-top: var(--space-6);
    width: 100%;               /* ← make sure it spans full width */
    text-align: center;
}

.sponsor-logo-wrap {
    background: rgba(255, 255, 255, 0.92);
    border-radius: var(--radius-lg);
    padding: var(--space-3) var(--space-5);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition), transform var(--transition);
}
.sponsor-logo-wrap:hover {
    background: rgba(255, 255, 255, 1);
    transform: translateY(-2px);
}

.sponsor-logo {
    height: 36px;
    width: auto;
    display: block;
    filter: none !important;        /* ← cancels any global invert filter */
    opacity: 1 !important;
}

/* ── CARDS ──────────────────────────────────────────────────── */
.card {
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-xl); padding: var(--space-6);
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}
.card:hover { border-color: rgba(0,212,212,0.3); box-shadow: 0 8px 32px rgba(0,212,212,0.08); transform: translateY(-2px); }
.card h4 { font-size: var(--text-base); color: var(--color-teal); margin-bottom: var(--space-2); font-weight: 600; }
.card p  { font-size: var(--text-sm); color: var(--color-text-muted); line-height: 1.6; }

/* ── FOOTER ─────────────────────────────────────────────────── */
.site-footer {
  background: var(--color-surface); border-top: 1px solid var(--color-border);
  padding: var(--space-12) var(--space-6) var(--space-8);
}
.footer-grid {
  max-width: var(--content-wide); margin-inline: auto;
  display: grid; grid-template-columns: 2fr 1fr 1fr; gap: var(--space-10);
  padding-bottom: var(--space-8); border-bottom: 1px solid var(--color-divider);
}
.footer-brand p { color: var(--color-text-muted); font-size: var(--text-sm); margin-top: var(--space-3); max-width: 38ch; line-height: 1.7; }
.footer-col h4 { font-family: var(--font-display); font-size: var(--text-sm); font-weight: 600; color: var(--color-text); margin-bottom: var(--space-4); letter-spacing: 0.05em; text-transform: uppercase; }
.footer-col ul { display: flex; flex-direction: column; gap: var(--space-2); }
.footer-col a  { font-size: var(--text-sm); color: var(--color-text-muted); transition: color var(--transition); }
.footer-col a:hover { color: var(--color-teal); }
.footer-bottom {
    /* Pull it edge-to-edge, overriding the parent's padding */
    margin-left: calc(-1 * var(--space-6));
    margin-right: calc(-1 * var(--space-6));
    margin-bottom: calc(-1 * var(--space-8));
    padding: var(--space-4) var(--space-6);

    /* Match the header color exactly */
    background: rgba(254, 254, 255, 0.6);   /* white header */
    border-top: 1px solid rgba(0, 0, 0, 0.08);


}

.footer-bottom-inner {
    max-width: var(--content-wide);
    margin-inline: auto;
    padding: var(--space-2) var(--space-2);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--space-2);
}

/* Text and logos need to go dark since background is now light */
.footer-bottom p {
    font-size: var(--text-xs);
    color: #3a3e44;
}

.footer-logos   { display: flex; align-items: center; gap: var(--space-8); }
.footer-logo    { height: 40px; width: auto; opacity: 1.4; transition: opacity var(--transition); }
.footer-logo:hover { opacity: 0.7; }

/* ── BADGE ──────────────────────────────────────────────────── */
.badge {
  display: inline-flex; align-items: center; gap: var(--space-2);
  padding: var(--space-1) var(--space-3); border-radius: var(--radius-full);
  font-size: var(--text-xs); font-weight: 600; letter-spacing: 0.05em;
}
.badge-teal   { background: var(--color-teal-glow); color: var(--color-teal); border: 1px solid rgba(0,212,212,0.25); }
.badge-cherry { background: var(--color-cherry-glow); color: #e8a0a8; border: 1px solid rgba(157,34,53,0.3); }

/* ── FORMS ──────────────────────────────────────────────────── */
.form-group { display: flex; flex-direction: column; gap: var(--space-2); margin-bottom: var(--space-5); }
.form-group label { font-size: var(--text-sm); font-weight: 500; color: var(--color-text-muted); }
.form-group .required { color: var(--color-teal); margin-left: 2px; }
.form-control {
  width: 100%; padding: var(--space-3) var(--space-4);
  background: var(--color-surface-2); border: 1px solid var(--color-border);
  border-radius: var(--radius-md); color: var(--color-text);
  font-size: var(--text-sm); transition: border-color var(--transition), box-shadow var(--transition);
}
.form-control:focus { outline: none; border-color: var(--color-teal); box-shadow: 0 0 0 3px rgba(0,212,212,0.1); }
.form-control::placeholder { color: var(--color-text-faint); }
textarea.form-control { resize: vertical; min-height: 100px; }
select.form-control { cursor: pointer; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-4); }

/* ── ALERTS ─────────────────────────────────────────────────── */
.alert { padding: var(--space-5) var(--space-6); border-radius: var(--radius-lg); margin-bottom: var(--space-6); }
.alert h3 { font-size: var(--text-base); margin-bottom: var(--space-2); }
.alert-success { background: rgba(0,212,212,0.08); border: 1px solid rgba(0,212,212,0.25); color: #a0f0f0; }
.alert-error   { background: rgba(157,34,53,0.12); border: 1px solid rgba(157,34,53,0.3);  color: #f0a0a8; }
.alert-success h3 { color: var(--color-teal); }
.alert-error h3   { color: var(--color-cherry-light); }

/* ── RESPONSIVE ─────────────────────────────────────────────── */
@media (max-width: 768px) {
  .nav-logos .nav-logo:not(:first-child) { display: none; }
  .main-nav a:not(.btn-register) { display: none; }
  .footer-grid { grid-template-columns: 1fr; gap: var(--space-8); }
  .form-row { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
}
@media (max-width: 480px) {
  .nav-logos { gap: var(--space-2); }
  .nav-logo  { height: 28px; }
}

/* ── SCROLL REVEAL ──────────────────────────────────────────── */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; transition: none; } }