/* ============================================================
   KBH Case Competition Portal — design tokens
   Palette: deep grid-navy + copper/amber energy accent + teal
   Type: Space Grotesk (display, technical/grid character) + Inter (body)
   ============================================================ */

:root {
  --navy-950: #0b1420;
  --navy-900: #101d2c;
  --navy-800: #16283a;
  --navy-700: #203a52;
  --paper-100: #f6f2e7;
  --paper-050: #fbf9f3;
  --ink-900: #171b1f;
  --ink-600: #4b5560;
  --amber-500: #e6a13a;
  --amber-600: #c8842a;
  --teal-400: #4fb0a5;
  --teal-600: #37847b;
  --red-500: #c25450;
  --line: rgba(23, 27, 31, 0.14);
  --line-dark: rgba(246, 242, 231, 0.18);

  --radius: 3px;
  --max-w: 960px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper-100);
  color: var(--ink-900);
  font-family: "Inter", system-ui, -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.55;
}

h1, h2, h3, h4 {
  font-family: "Space Grotesk", system-ui, sans-serif;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0 0 0.4em;
  color: var(--navy-950);
}

h1 { font-size: clamp(2rem, 4vw, 2.9rem); line-height: 1.08; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.05rem; }

p { max-width: 62ch; color: var(--ink-600); }

a { color: var(--teal-600); text-decoration: none; }
a:hover { text-decoration: underline; }

:focus-visible {
  outline: 2px solid var(--amber-500);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

/* ---------- layout ---------- */

.site-header {
  background: var(--navy-950);
  color: var(--paper-100);
  padding: 18px 24px;
}

.site-header .wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.brand {
  font-family: "Space Grotesk", sans-serif;
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--paper-100);
  text-decoration: none;
}

.brand:hover { opacity: 0.9; }

.brand span { color: var(--amber-500); }

.site-header nav {
  display: flex;
  gap: 20px;
  font-size: 0.92rem;
  margin-left: auto;
  justify-content: flex-end;
  text-align: right;
}
.site-header nav a { color: var(--paper-100); opacity: 0.85; }
.site-header nav a:hover { opacity: 1; }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  flex-direction: column;
  justify-content: center;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--paper-100);
  margin: 4px 0;
  transition: transform 0.15s ease, opacity 0.15s ease;
}
.nav-toggle span:first-child { margin-top: 0; }
.nav-toggle span:last-child { margin-bottom: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
.nav-dropdown {
  position: relative;
}
.nav-dropdown-toggle {
  background: none;
  border: none;
  font: inherit;
  color: var(--paper-100);
  opacity: 0.85;
  cursor: pointer;
  padding: 0;
}
.nav-dropdown-toggle:hover { opacity: 1; }
.nav-dropdown-menu {
  display: none;
  position: absolute;
  top: 26px;
  right: 0;
  min-width: 150px;
  background: var(--paper-050);
  border: 1px solid var(--line);
  z-index: 30;
}
.nav-dropdown-menu.open { display: block; }
.site-header .nav-dropdown-menu a {
  display: block;
  padding: 10px 14px;
  color: var(--ink-900);
  opacity: 1;
  font-size: 0.9rem;
}
.site-header .nav-dropdown-menu a:hover { background: rgba(230,161,58,0.14); text-decoration: none; }

main {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 48px 24px 80px;
}

.hero {
  background: var(--navy-950);
  color: var(--paper-100);
  padding: 64px 24px 56px;
  position: relative;
  overflow: hidden;
}

.hero .wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

.hero p { color: rgba(246,242,231,0.72); font-size: 1.08rem; }

.hero .dates {
  font-family: "Space Grotesk", sans-serif;
  color: var(--amber-500);
  font-size: 1rem;
  margin-bottom: 14px;
}

.grid-lines {
  position: absolute;
  inset: 0;
  z-index: 1;
  opacity: 0.55;
}

.cta-row { display: flex; gap: 14px; margin-top: 28px; flex-wrap: wrap; }

.case-writer-credit {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--line-dark);
}
.case-writer-credit span {
  font-size: 0.92rem;
  color: rgba(246,242,231,0.65);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-right: 14px;
}
.case-writer-logo { height: 30px; width: auto; display: block; }

/* ---------- buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1.5px solid transparent;
  border-radius: var(--radius);
  padding: 11px 20px;
  font-family: "Space Grotesk", sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  background: var(--amber-500);
  color: var(--navy-950);
  transition: transform 0.12s ease, background 0.12s ease;
}
.btn:hover { background: var(--amber-600); }
.btn:active { transform: translateY(1px); }

.btn.secondary {
  background: transparent;
  border-color: var(--line-dark);
  color: var(--paper-100);
}
.btn.secondary:hover { border-color: var(--amber-500); background: rgba(230,161,58,0.08); }

.btn.ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--navy-950);
}
.btn.ghost:hover { border-color: var(--amber-600); }

.btn.small { padding: 6px 12px; font-size: 0.82rem; }
.btn.danger { background: var(--red-500); color: var(--paper-050); }
.btn.danger:hover { background: #a8423e; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ---------- cards / panels ---------- */

.panel {
  background: var(--paper-050);
  border: 1px solid var(--line);
  border-left: 3px solid var(--navy-900);
  padding: 28px;
  margin-bottom: 24px;
}

.panel.accent { border-left-color: var(--amber-500); }

.two-up {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
@media (max-width: 720px) { .two-up { grid-template-columns: 1fr; } }

/* ---------- forms ---------- */

fieldset {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px 20px;
  margin: 0 0 20px;
}
legend {
  font-family: "Space Grotesk", sans-serif;
  font-weight: 600;
  padding: 0 6px;
  color: var(--navy-800);
}

label {
  display: block;
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--ink-900);
  margin: 14px 0 6px;
}
label:first-child { margin-top: 0; }
label .hint { font-weight: 400; color: var(--ink-600); }

input[type="text"], input[type="email"], input[type="tel"],
input[type="password"], input[type="number"], select, textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  font-family: inherit;
  font-size: 0.95rem;
  color: var(--ink-900);
}
input:focus, select:focus, textarea:focus { border-color: var(--amber-600); }

.checkbox-row { display: flex; align-items: center; gap: 8px; margin: 10px 0; }
.checkbox-row input { width: auto; }
.checkbox-row label { margin: 0; font-weight: 500; }

textarea { min-height: 90px; resize: vertical; }

.form-actions { margin-top: 24px; display: flex; align-items: center; gap: 14px; }

.status-msg { font-size: 0.9rem; margin-top: 10px; }
.status-msg.ok { color: var(--teal-600); }
.status-msg.err { color: var(--red-500); }

/* ---------- tables ---------- */

table { width: 100%; border-collapse: collapse; font-size: 0.88rem; }
th, td {
  text-align: left;
  padding: 9px 10px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
th { font-family: "Space Grotesk", sans-serif; color: var(--navy-800); font-size: 0.8rem; }
.table-scroll { overflow-x: auto; }

.badge {
  display: inline-block;
  padding: 2px 9px;
  border-radius: 999px;
  font-size: 0.74rem;
  font-weight: 600;
  background: var(--navy-900);
  color: var(--paper-100);
}
.badge.amber { background: var(--amber-500); color: var(--navy-950); }
.badge.teal { background: var(--teal-400); color: var(--navy-950); }
.badge.outline { background: transparent; border: 1px solid var(--line); color: var(--ink-600); }

/* ---------- tabs (organizer) ---------- */

.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--line); margin-bottom: 28px; flex-wrap: wrap; }
.tab-btn {
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  padding: 10px 4px;
  margin-right: 22px;
  font-family: "Space Grotesk", sans-serif;
  font-size: 0.95rem;
  color: var(--ink-600);
  cursor: pointer;
}
.tab-btn.active { color: var(--navy-950); border-bottom-color: var(--amber-500); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }
.main-panel { display: none; }
.main-panel.active { display: block; }

/* ---------- misc ---------- */

.empty-state {
  border: 1px dashed var(--line);
  padding: 30px;
  text-align: center;
  color: var(--ink-600);
  font-size: 0.92rem;
}

.stat-row { display: flex; gap: 20px; flex-wrap: wrap; margin-bottom: 32px; }
.stat {
  flex: 1;
  min-width: 140px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--amber-500);
  padding: 16px 18px;
  background: var(--paper-050);
}
.stat .num { font-family: "Space Grotesk", sans-serif; font-size: 1.9rem; color: var(--navy-950); }
.stat .lbl { font-size: 0.8rem; color: var(--ink-600); }

.inline-field { display: flex; gap: 10px; align-items: end; flex-wrap: wrap; }
.inline-field > div { flex: 1; min-width: 160px; }

/* ---------- timeline (schedule page) ---------- */

.timeline { border-left: 2px solid var(--line); margin: 0 0 32px 6px; padding-left: 24px; }
.timeline-item { position: relative; padding-bottom: 22px; }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 4px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--amber-500);
}
.timeline-time {
  font-family: "Space Grotesk", sans-serif;
  font-weight: 600;
  color: var(--navy-950);
  font-size: 0.92rem;
}
.timeline-activity { margin: 2px 0 0; }
.timeline-location { color: var(--ink-600); font-size: 0.86rem; }

footer.site-footer {
  border-top: 1px solid var(--line);
  padding: 20px 24px 40px;
  text-align: center;
  color: var(--ink-600);
  font-size: 0.82rem;
}

/* ---------- mobile (phones only — laptop/desktop layout above is untouched) ---------- */

@media (max-width: 640px) {
  .site-header { padding: 14px 18px; }
  .site-header .wrap { flex-direction: row; align-items: center; flex-wrap: wrap; gap: 10px; }
  .brand { font-size: 0.98rem; line-height: 1.25; }

  .nav-toggle { display: flex; }

  .site-header nav {
    display: none;
    width: 100%;
    flex-basis: 100%;
    order: 3;
    flex-direction: column;
    align-items: stretch;
    text-align: left;
    gap: 0;
    margin-top: 16px;
    margin-left: 0;
    border-top: 1px solid var(--line-dark);
  }
  .site-header nav.open { display: flex; }
  .site-header nav a {
    padding: 13px 2px;
    border-bottom: 1px solid var(--line-dark);
    opacity: 1;
  }

  .nav-dropdown { width: 100%; }
  .nav-dropdown-toggle { display: none; }
  .nav-dropdown-menu {
    position: static;
    display: block !important;
    background: none;
    border: none;
    min-width: 0;
  }
  .site-header .nav-dropdown-menu a {
    padding: 13px 2px 13px 16px;
    font-size: 0.92rem;
    color: var(--paper-100);
    opacity: 0.85;
    border-bottom: 1px solid var(--line-dark);
  }
  .site-header .nav-dropdown-menu a:hover { background: none; }

  main { padding: 32px 18px 60px; }
  .hero { padding: 44px 18px 40px; }
  .hero p { font-size: 1rem; }

  .cta-row { flex-direction: column; }
  .cta-row .btn { width: 100%; justify-content: center; }

  .stat-row { flex-direction: column; }
  .stat { min-width: 0; }

  .two-up { gap: 16px; }

  .panel { padding: 20px; }

  .inline-field { flex-direction: column; align-items: stretch; }
  .inline-field > div { min-width: 0; }

  .tabs { gap: 2px; }
  .tab-btn { margin-right: 14px; padding: 10px 2px; font-size: 0.88rem; }

  table { font-size: 0.82rem; }
  th, td { padding: 8px 6px; }

  .timeline { margin-left: 2px; padding-left: 18px; }
  .timeline-item::before { left: -24px; }

  .form-actions { flex-direction: column; align-items: stretch; }
  .form-actions .btn { width: 100%; justify-content: center; }
}