/* =========================================================================
   ACDCTF · Ekho theme — main.css
   Severity-color visual language. Black base, mono data density.
   ========================================================================= */

/* Self-host Google fonts via @import (CTFd's CSP usually allows fonts.gstatic) */
@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@300;400;500;600;700&family=JetBrains+Mono:wght@300;400;500;600;700&family=Space+Grotesk:wght@400;500;600;700&display=swap');

/* ---------- Tokens ------------------------------------------------------- */
:root {
  /* Surfaces */
  --bg-0: #050608;
  --bg-1: #0a0c0f;
  --bg-2: #11151a;
  --bg-3: #1a2027;
  --bg-elev: #0e1218;

  /* Hairlines */
  --line-1: rgba(255, 255, 255, 0.06);
  --line-2: rgba(255, 255, 255, 0.10);
  --line-3: rgba(255, 255, 255, 0.16);

  /* Text */
  --text-hi: #e6ebf0;
  --text-mid: #8a949e;
  --text-lo: #4d555e;
  --text-dim: #2f353c;

  /* Severity */
  --sig-green: #4dff9a;
  --sig-green-dim: rgba(77, 255, 154, 0.15);
  --sig-amber: #ffb84d;
  --sig-amber-dim: rgba(255, 184, 77, 0.15);
  --sig-red: #ff5247;
  --sig-red-dim: rgba(255, 82, 71, 0.15);
  --sig-cyan: #4dd6ff;

  /* Type */
  --font-sans: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", Menlo, monospace;
  --font-display: "Space Grotesk", "IBM Plex Sans", sans-serif;
}

/* ---------- Reset / base ------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg-0);
  color: var(--text-hi);
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body { min-height: 100vh; display: flex; flex-direction: column; }
main { flex: 1; }

a { color: var(--sig-cyan); text-decoration: none; }
a:hover { color: var(--sig-green); }

code, pre { font-family: var(--font-mono); }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 500;
  letter-spacing: -0.3px;
  margin: 0 0 12px;
}
h1 { font-size: 32px; letter-spacing: -0.6px; }
h2 { font-size: 24px; }
h3 { font-size: 18px; }

p { margin: 0 0 12px; color: var(--text-mid); }

::selection { background: var(--sig-green-dim); color: var(--text-hi); }

/* ---------- Animations --------------------------------------------------- */
@keyframes acd-blink { 0%, 49% { opacity: 1; } 50%, 100% { opacity: 0; } }
@keyframes acd-flicker {
  0%, 100% { opacity: 1; }
  92% { opacity: 1; } 93% { opacity: 0.55; } 94% { opacity: 1; }
  96% { opacity: 0.8; } 97% { opacity: 1; }
}

/* ---------- Layout ------------------------------------------------------- */
.acd-shell {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.acd-container {
  width: 100%;
  max-width: 1320px;
  margin: 0 auto;
  padding: 24px 32px;
}
.acd-container.tight { max-width: 880px; }
.acd-container.narrow { max-width: 560px; }

.acd-page-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 22px;
}
.acd-page-head .acd-eyebrow {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--sig-green);
  letter-spacing: 1.5px;
  text-transform: uppercase;
}
.acd-page-head h1 { font-size: 30px; margin: 4px 0 0; }

/* ---------- Top nav ------------------------------------------------------ */
.acd-nav {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center;
  height: 60px;
  padding: 0 32px;
  background: var(--bg-0);
  border-bottom: 1px solid var(--line-1);
  gap: 24px;
  flex-shrink: 0;
}
.acd-nav .acd-brand {
  display: flex; align-items: center; gap: 10px;
  color: var(--text-hi); text-decoration: none;
  font-family: var(--font-mono); font-weight: 700;
  letter-spacing: 2px; font-size: 16px;
}
.acd-nav .acd-brand img { display: block; height: 22px; }
.acd-nav .acd-brand .sub {
  font-family: var(--font-mono);
  font-size: 10px; color: var(--text-lo);
  letter-spacing: 1.4px;
  text-transform: uppercase;
  font-weight: 400;
  margin-left: 6px;
}
.acd-nav-links {
  display: flex; gap: 4px; flex: 1;
}
.acd-nav-links a {
  padding: 8px 14px;
  font-family: var(--font-mono);
  font-size: 12.5px; font-weight: 500;
  letter-spacing: 0.6px;
  color: var(--text-mid);
  text-transform: uppercase;
  border-bottom: 1px solid transparent;
  margin-bottom: -1px;
}
.acd-nav-links a:hover { color: var(--text-hi); }
.acd-nav-links a.active {
  color: var(--text-hi);
  border-bottom-color: var(--sig-green);
}
.acd-nav-meta {
  display: flex; align-items: center; gap: 14px;
  font-family: var(--font-mono); font-size: 11px;
  color: var(--text-mid);
}
.acd-nav-meta .live-dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--sig-green);
  box-shadow: 0 0 8px var(--sig-green);
  animation: acd-blink 1.4s infinite;
  display: inline-block;
}
.acd-nav-meta .avatar {
  width: 28px; height: 28px; border-radius: 50%;
  background: linear-gradient(135deg, var(--sig-green), var(--sig-red));
  opacity: 0.85;
}

/* ---------- Footer ------------------------------------------------------- */
.acd-footer {
  padding: 22px 32px;
  border-top: 1px solid var(--line-1);
  display: flex; justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 10px; color: var(--text-lo);
  letter-spacing: 1px;
}

/* ---------- Buttons ------------------------------------------------------ */
.acd-btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 8px;
  height: 42px;
  padding: 0 18px;
  border: 1px solid var(--line-2);
  background: var(--bg-2);
  color: var(--text-hi);
  font-family: var(--font-mono);
  font-size: 12px; font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  cursor: pointer;
  border-radius: 0;
  text-decoration: none;
  transition: background 0.12s, border-color 0.12s, color 0.12s;
}
.acd-btn:hover { background: var(--bg-3); color: var(--text-hi); border-color: var(--line-3); }

.acd-btn-primary {
  border-color: var(--sig-green);
  background: linear-gradient(180deg, rgba(77,255,154,0.16), rgba(77,255,154,0.04));
  position: relative; overflow: hidden;
}
.acd-btn-primary::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 3px;
  background: var(--sig-green); box-shadow: 0 0 12px var(--sig-green);
}
.acd-btn-primary:hover { background: linear-gradient(180deg, rgba(77,255,154,0.24), rgba(77,255,154,0.08)); }

.acd-btn-secondary {
  border-color: var(--sig-amber);
  background: rgba(255, 184, 77, 0.06);
}

.acd-btn-ghost { background: transparent; }
.acd-btn-danger { border-color: var(--sig-red); color: var(--sig-red); }

.acd-btn-block { width: 100%; }

/* ---------- Form fields -------------------------------------------------- */
.acd-field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 14px; }
.acd-field-label {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-mid);
  letter-spacing: 1.2px;
  text-transform: uppercase;
}
.acd-field-hint {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-lo);
}
.acd-input, .acd-textarea, .acd-select {
  width: 100%;
  height: 42px;
  padding: 0 14px;
  background: var(--bg-2);
  border: 1px solid var(--line-2);
  color: var(--text-hi);
  font-family: var(--font-sans);
  font-size: 13.5px;
  outline: none;
  border-radius: 2px;
  transition: border-color 0.12s, background 0.12s;
}
.acd-input.mono, .acd-textarea.mono { font-family: var(--font-mono); letter-spacing: 1px; }
.acd-textarea { height: auto; min-height: 100px; padding: 12px 14px; resize: vertical; }
.acd-input:focus, .acd-textarea:focus, .acd-select:focus {
  border-color: var(--sig-green);
  background: var(--bg-1);
}
.acd-input.accent { border-color: var(--sig-amber); }
.acd-input::placeholder { color: var(--text-lo); }

.acd-checkbox {
  display: flex; align-items: flex-start; gap: 10px;
  cursor: pointer;
  font-size: 12px; color: var(--text-mid);
  line-height: 1.5;
}
.acd-checkbox input { display: none; }
.acd-checkbox .acd-box {
  width: 14px; height: 14px;
  border: 1px solid var(--line-3);
  background: var(--bg-2);
  border-radius: 2px;
  display: inline-flex; align-items: center; justify-content: center;
  flex-shrink: 0; margin-top: 2px;
}
.acd-checkbox input:checked + .acd-box::after {
  content: ""; width: 6px; height: 6px;
  background: var(--sig-green);
}

/* ---------- Cards -------------------------------------------------------- */
.acd-card {
  background: var(--bg-1);
  border: 1px solid var(--line-1);
  padding: 18px 22px;
}
.acd-card-padded { padding: 24px 28px; }

/* ---------- Pills / severity / status ------------------------------------ */
.acd-pill {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 2px 8px;
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 10px; font-weight: 600;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  line-height: 1.4;
  border: 1px solid;
}
.acd-pill::before {
  content: ""; width: 5px; height: 5px; border-radius: 50%; display: inline-block;
  box-shadow: 0 0 6px currentColor;
}
.acd-pill-low,  .acd-pill-ok   { color: var(--sig-green); background: rgba(77,255,154,0.10); border-color: rgba(77,255,154,0.30); }
.acd-pill-med,  .acd-pill-triaged { color: var(--sig-amber); background: rgba(255,184,77,0.10); border-color: rgba(255,184,77,0.30); }
.acd-pill-high, .acd-pill-crit, .acd-pill-open { color: var(--sig-red); background: rgba(255,82,71,0.10); border-color: rgba(255,82,71,0.30); }
.acd-pill-info  { color: var(--sig-cyan); background: rgba(77,214,255,0.10); border-color: rgba(77,214,255,0.30); }

/* Severity rail (gradient bar) */
.acd-rail {
  height: 3px; width: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--sig-green) 0%, #b5e94d 35%, var(--sig-amber) 65%, var(--sig-red) 100%);
  opacity: 0.85;
}
.acd-rail.thin { height: 2px; }

/* ---------- Alerts ------------------------------------------------------- */
.acd-alert {
  display: flex; gap: 12px; align-items: flex-start;
  padding: 14px 16px;
  border: 1px solid;
  border-left-width: 3px;
  margin-bottom: 14px;
  background: var(--bg-1);
}
.acd-alert-icon {
  font-family: var(--font-mono); font-size: 18px; font-weight: 700;
  line-height: 1;
}
.acd-alert-body { flex: 1; }
.acd-alert-eyebrow {
  font-family: var(--font-mono); font-size: 10px;
  letter-spacing: 1.2px; text-transform: uppercase;
  margin-bottom: 4px;
}
.acd-alert-text { font-size: 13px; color: var(--text-hi); line-height: 1.55; }

.acd-alert-info    { border-color: var(--sig-cyan);  background: rgba(77,214,255,0.04); }
.acd-alert-info  .acd-alert-icon, .acd-alert-info .acd-alert-eyebrow { color: var(--sig-cyan); }
.acd-alert-success { border-color: var(--sig-green); background: rgba(77,255,154,0.04); }
.acd-alert-success .acd-alert-icon, .acd-alert-success .acd-alert-eyebrow { color: var(--sig-green); }
.acd-alert-warning { border-color: var(--sig-amber); background: rgba(255,184,77,0.04); }
.acd-alert-warning .acd-alert-icon, .acd-alert-warning .acd-alert-eyebrow { color: var(--sig-amber); }
.acd-alert-danger  { border-color: var(--sig-red);   background: rgba(255,82,71,0.06); }
.acd-alert-danger  .acd-alert-icon, .acd-alert-danger .acd-alert-eyebrow { color: var(--sig-red); }

/* ---------- Toasts (top-right) ------------------------------------------- */
.acd-toasts {
  position: fixed; top: 80px; right: 24px; z-index: 1000;
  display: flex; flex-direction: column; gap: 8px;
  pointer-events: none;
}
.acd-toast {
  pointer-events: auto;
  background: var(--bg-elev);
  border: 1px solid var(--sig-green);
  border-left: 4px solid var(--sig-green);
  padding: 14px 18px;
  display: flex; align-items: center; gap: 14px;
  box-shadow: 0 12px 40px rgba(0,0,0,0.6), 0 0 20px rgba(77,255,154,0.15);
  min-width: 280px; max-width: 420px;
  animation: acd-toast-in 0.25s cubic-bezier(.2,.7,.3,1);
}
@keyframes acd-toast-in {
  from { transform: translateX(20px); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}
.acd-toast.acd-toast-err { border-color: var(--sig-red); border-left-color: var(--sig-red); }
.acd-toast.acd-toast-warn { border-color: var(--sig-amber); border-left-color: var(--sig-amber); }
.acd-toast-icon {
  width: 30px; height: 30px; flex-shrink: 0;
  border-radius: 50%; border: 1.5px solid var(--sig-green);
  background: rgba(77,255,154,0.10);
  display: flex; align-items: center; justify-content: center;
  color: var(--sig-green); font-weight: 700;
}
.acd-toast.acd-toast-err .acd-toast-icon { border-color: var(--sig-red); background: rgba(255,82,71,0.10); color: var(--sig-red); }
.acd-toast.acd-toast-warn .acd-toast-icon { border-color: var(--sig-amber); background: rgba(255,184,77,0.10); color: var(--sig-amber); }
.acd-toast-body { flex: 1; }
.acd-toast-eyebrow {
  font-family: var(--font-mono); font-size: 10px;
  letter-spacing: 1.2px; text-transform: uppercase;
  color: var(--sig-green); margin-bottom: 2px;
}
.acd-toast.acd-toast-err .acd-toast-eyebrow { color: var(--sig-red); }
.acd-toast.acd-toast-warn .acd-toast-eyebrow { color: var(--sig-amber); }
.acd-toast-text { font-size: 13px; color: var(--text-hi); }

/* ---------- Auth split (login / register / reset) ------------------------ */
.acd-auth {
  min-height: calc(100vh - 60px);
  display: grid;
  grid-template-columns: 1.05fr 1fr;
}
.acd-auth-hero {
  position: relative;
  background: radial-gradient(ellipse at 30% 40%, #1a0a0a 0%, #060708 60%, #000 100%);
  padding: 48px 56px;
  display: flex; flex-direction: column; justify-content: space-between;
  overflow: hidden;
}
.acd-auth-hero::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image: repeating-linear-gradient(
    to bottom,
    rgba(255, 255, 255, 0.025) 0px,
    rgba(255, 255, 255, 0.025) 1px,
    transparent 1px, transparent 3px
  );
  z-index: 1;
}
.acd-auth-hero > * { position: relative; z-index: 2; }
.acd-auth-hero-top {
  display: flex; justify-content: space-between; align-items: center;
  font-family: var(--font-mono); font-size: 10px;
  color: var(--text-lo); letter-spacing: 1.2px; text-transform: uppercase;
}
.acd-auth-hero-art {
  flex: 1; display: flex; align-items: center; justify-content: center;
}
.acd-auth-hero-art img {
  width: 72%; max-width: 460px;
  filter: contrast(1.05) saturate(1.1);
  animation: acd-flicker 6s infinite;
}
.acd-auth-form {
  background: var(--bg-1);
  border-left: 1px solid var(--line-2);
  padding: 44px 72px;
  display: flex; flex-direction: column; justify-content: center;
  overflow: auto;
}
.acd-auth-eyebrow {
  font-family: var(--font-mono); font-size: 11px;
  color: var(--sig-green); letter-spacing: 1.5px; text-transform: uppercase;
  margin-bottom: 12px;
}
.acd-auth-title {
  font-family: var(--font-display); font-size: 38px; font-weight: 500;
  margin: 0 0 12px; letter-spacing: -0.5px; line-height: 1.05;
}
.acd-auth-sub {
  font-size: 13.5px; color: var(--text-mid); line-height: 1.55;
  max-width: 420px; margin: 0 0 28px;
}

/* ---------- Briefing notes ASCII rule ----------------------------------- */
.acd-rule {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--font-mono); font-size: 10px;
  color: var(--text-lo); letter-spacing: 1px; text-transform: uppercase;
  margin: 18px 0 10px;
}
.acd-rule::before, .acd-rule::after {
  content: ""; flex: 1;
  border-top: 1px dashed var(--text-lo); opacity: 0.4;
}

/* ---------- Challenges grid --------------------------------------------- */
.acd-chal-shell { display: grid; grid-template-columns: 220px 1fr; min-height: calc(100vh - 60px); }
.acd-chal-side {
  background: var(--bg-0);
  border-right: 1px solid var(--line-1);
  padding: 24px 16px;
}
.acd-chal-side .acd-rule { margin: 0 0 8px; padding: 0 8px; justify-content: flex-start; }
.acd-chal-side .acd-rule::before, .acd-chal-side .acd-rule::after { display: none; }

.acd-chal-cat {
  display: flex; align-items: center; gap: 10px;
  padding: 8px 10px;
  border-radius: 3px;
  background: transparent;
  border: none;
  cursor: pointer;
  width: 100%;
  color: var(--text-mid);
  font-family: var(--font-sans);
  font-size: 13px;
  border-left: 2px solid transparent;
  text-align: left;
}
.acd-chal-cat:hover { color: var(--text-hi); background: var(--bg-2); }
.acd-chal-cat.active {
  color: var(--text-hi);
  background: var(--bg-2);
  border-left-color: var(--sig-green);
}
.acd-chal-cat .icon {
  width: 18px;
  font-family: var(--font-mono);
  color: var(--text-lo);
  font-size: 14px;
}
.acd-chal-cat.active .icon { color: var(--sig-green); }
.acd-chal-cat .name { flex: 1; }
.acd-chal-cat .count {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-lo);
}

.acd-chal-main { padding: 24px 32px; }
.acd-chal-status {
  display: flex; align-items: center; gap: 18px;
  padding: 12px 0 18px;
  font-family: var(--font-mono); font-size: 11px;
  color: var(--text-mid); border-bottom: 1px solid var(--line-1);
  margin-bottom: 20px;
}
.acd-chal-status .sep { color: var(--text-lo); }
.acd-chal-status .grow { flex: 1; }

.acd-chal-grid {
  display: grid; gap: 10px;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

.acd-chal-card {
  position: relative;
  background: var(--bg-1);
  border: 1px solid var(--line-1);
  padding: 16px 18px 14px;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}
.acd-chal-card:hover { background: var(--bg-2); border-color: var(--line-2); }
.acd-chal-card.solved { background: rgba(77,255,154,0.025); }
.acd-chal-card::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0;
  width: 2px;
  background: var(--sig-green);
}
.acd-chal-card[data-sev="med"]::before  { background: var(--sig-amber); }
.acd-chal-card[data-sev="high"]::before { background: var(--sig-red);   box-shadow: 0 0 8px var(--sig-red); }
.acd-chal-card[data-sev="crit"]::before { background: var(--sig-red);   box-shadow: 0 0 10px var(--sig-red); }
.acd-chal-card.solved::before { box-shadow: none; opacity: 0.8; }

.acd-chal-card-head {
  display: flex; align-items: center; gap: 8px; margin-bottom: 10px;
}
.acd-chal-card-cat {
  font-family: var(--font-mono); font-size: 10px;
  color: var(--text-mid); letter-spacing: 1px; text-transform: uppercase;
}
.acd-chal-card-title {
  font-family: var(--font-display); font-size: 17px; font-weight: 500;
  margin: 0 0 14px; color: var(--text-hi); letter-spacing: -0.2px;
}
.acd-chal-card.solved .acd-chal-card-title {
  color: var(--text-mid);
  text-decoration: line-through;
  text-decoration-color: rgba(77, 255, 154, 0.4);
}
.acd-chal-card-meta {
  display: flex; justify-content: space-between; margin-top: 10px;
  font-family: var(--font-mono); font-size: 11px; color: var(--text-mid);
}
.acd-chal-card-meta .pts { color: var(--text-hi); font-weight: 600; }

/* ---------- Challenge modal (dialog) ------------------------------------ */
.acd-modal-backdrop {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.65);
  backdrop-filter: blur(4px);
  z-index: 800;
  display: flex; align-items: flex-start; justify-content: center;
  padding: 80px 24px 24px;
  overflow-y: auto;
}
.acd-modal {
  width: 100%; max-width: 720px;
  background: var(--bg-1);
  border: 1px solid var(--line-3);
  box-shadow: 0 30px 80px rgba(0,0,0,0.6);
}
.acd-modal-accent { height: 3px; background: var(--sig-red); box-shadow: 0 0 12px var(--sig-red); }
.acd-modal-accent[data-sev="low"]  { background: var(--sig-green); box-shadow: 0 0 12px var(--sig-green); }
.acd-modal-accent[data-sev="med"]  { background: var(--sig-amber); box-shadow: 0 0 12px var(--sig-amber); }
.acd-modal-head {
  padding: 20px 26px 18px;
  border-bottom: 1px solid var(--line-1);
  display: flex; justify-content: space-between; align-items: flex-start;
  gap: 16px;
}
.acd-modal-meta-row { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; }
.acd-modal-title { font-family: var(--font-display); font-size: 24px; font-weight: 500; margin: 0; letter-spacing: -0.4px; }
.acd-modal-close {
  background: transparent; border: 1px solid var(--line-2);
  color: var(--text-mid); width: 32px; height: 32px;
  cursor: pointer; font-size: 18px; font-family: var(--font-mono);
  flex-shrink: 0;
}
.acd-modal-body { padding: 20px 26px; max-height: 70vh; overflow-y: auto; }

.acd-modal-stats {
  display: grid; grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--line-1); margin-bottom: 18px;
}
.acd-modal-stat {
  padding: 12px 16px;
  border-right: 1px solid var(--line-1);
  background: var(--bg-2);
}
.acd-modal-stat:last-child { border-right: none; }
.acd-modal-stat .label {
  font-family: var(--font-mono); font-size: 9px;
  color: var(--text-lo); letter-spacing: 1px; text-transform: uppercase;
  margin-bottom: 4px;
}
.acd-modal-stat .val {
  font-family: var(--font-mono); font-size: 16px; font-weight: 600;
  color: var(--text-hi); line-height: 1.1;
}
.acd-modal-stat .val.amber { color: var(--sig-amber); }

.acd-hint-row {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 14px;
  background: var(--bg-2);
  border: 1px solid var(--line-1);
  font-family: var(--font-mono); font-size: 12px;
  margin-bottom: 8px;
}
.acd-hint-row.unlocked { background: rgba(77,255,154,0.04); }
.acd-hint-row .num { color: var(--text-lo); font-weight: 600; letter-spacing: 1px; }
.acd-hint-row.unlocked .num { color: var(--sig-green); }
.acd-hint-row .body { color: var(--text-mid); flex: 1; }
.acd-hint-row .lock { color: var(--text-lo); flex: 1; }
.acd-hint-btn {
  background: transparent; border: 1px solid var(--line-2);
  color: var(--sig-amber); padding: 4px 10px;
  font-family: var(--font-mono); font-size: 11px; cursor: pointer;
  letter-spacing: 0.5px;
}

.acd-flag-row {
  display: flex; gap: 8px;
}
.acd-flag-row .acd-input { height: 44px; font-size: 14px; }
.acd-flag-row .acd-btn { height: 44px; padding: 0 22px; }

/* ---------- Scoreboard --------------------------------------------------- */
.acd-board-stats {
  display: grid; grid-template-columns: repeat(4, 1fr);
  margin-bottom: 18px;
}
.acd-board-stat {
  border: 1px solid var(--line-1);
  padding: 14px 18px;
  background: var(--bg-1);
  margin-right: -1px;
}
.acd-board-stat .label {
  font-family: var(--font-mono); font-size: 10px;
  color: var(--text-lo); letter-spacing: 1.2px;
  margin-bottom: 8px;
}
.acd-board-stat .val {
  font-family: var(--font-display); font-size: 26px; font-weight: 600;
  color: var(--text-hi); letter-spacing: -0.3px;
  line-height: 1;
}
.acd-board-stat .val.mono { font-family: var(--font-mono); letter-spacing: 1px; }
.acd-board-stat .val.green { color: var(--sig-green); }
.acd-board-stat .val.amber { color: var(--sig-amber); }
.acd-board-stat .val.red   { color: var(--sig-red); }

.acd-board-bars {
  background: var(--bg-1);
  border: 1px solid var(--line-1);
  padding: 16px 20px;
  margin-bottom: 18px;
}
.acd-board-bars-head {
  display: flex; justify-content: space-between; align-items: baseline;
  margin-bottom: 10px;
  font-family: var(--font-mono); font-size: 10px;
  color: var(--text-mid); letter-spacing: 1px; text-transform: uppercase;
}
.acd-bar-row {
  display: grid;
  grid-template-columns: 36px 200px 1fr 80px;
  gap: 10px; align-items: center;
  font-family: var(--font-mono); font-size: 12px; line-height: 1.8;
}
.acd-bar-row .rank { font-weight: 700; }
.acd-bar-row .team { color: var(--text-hi); display: flex; align-items: center; gap: 8px; }
.acd-bar-row .bar  { font-family: var(--font-mono); letter-spacing: 0; white-space: nowrap; overflow: hidden; }
.acd-bar-row .bar .filled { color: inherit; }
.acd-bar-row .bar .empty  { color: var(--text-dim); }
.acd-bar-row .pts  { text-align: right; color: var(--text-hi); font-weight: 600; }
.acd-bar-row.you   { background: rgba(77,255,154,0.04); }
.acd-bar-row .you-tag {
  background: var(--sig-green); color: #000;
  padding: 0 5px; font-size: 9px; font-weight: 700; letter-spacing: 1px;
}

/* Scoreboard table */
.acd-table {
  width: 100%; border-collapse: collapse;
  background: var(--bg-1);
  border: 1px solid var(--line-1);
  font-family: var(--font-mono); font-size: 12.5px;
}
.acd-table thead th {
  text-align: left;
  padding: 11px 20px;
  font-family: var(--font-mono); font-size: 10px; font-weight: 500;
  color: var(--text-mid); letter-spacing: 1.2px; text-transform: uppercase;
  border-bottom: 1px solid var(--line-1);
  background: var(--bg-1);
}
.acd-table tbody td {
  padding: 11px 20px;
  border-bottom: 1px solid var(--line-1);
  color: var(--text-hi);
}
.acd-table tbody tr:last-child td { border-bottom: none; }
.acd-table tbody tr.you td { background: rgba(77,255,154,0.06); }
.acd-table .num { text-align: right; }
.acd-table .rank-cell { font-weight: 700; }

/* ---------- Tier indicator (■■□) ---------------------------------------- */
.acd-tier {
  font-family: var(--font-mono);
  letter-spacing: 1.5px;
  font-weight: 700;
}
.acd-tier .on  { color: inherit; }
.acd-tier .off { color: var(--text-dim); }

/* ---------- Stepper (team flow) ----------------------------------------- */
.acd-stepper {
  display: flex; align-items: center; gap: 12px;
  margin-bottom: 22px;
}
.acd-step { display: flex; align-items: center; gap: 8px; }
.acd-step .num {
  width: 24px; height: 24px;
  border: 1px solid var(--line-2);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono); font-size: 11px; font-weight: 600;
  color: var(--text-lo);
}
.acd-step .name {
  font-family: var(--font-mono); font-size: 11px;
  color: var(--text-lo); letter-spacing: 0.8px; text-transform: uppercase;
}
.acd-step.active .num { border-color: var(--sig-green); color: var(--text-hi); }
.acd-step.active .name { color: var(--text-hi); }
.acd-step.done .num   { border-color: var(--sig-green); background: rgba(77,255,154,0.12); color: var(--sig-green); }
.acd-step.done .name  { color: var(--sig-green); }
.acd-step-connector { flex: 0 0 40px; height: 1px; background: var(--line-2); }
.acd-step-connector.done { background: var(--sig-green); }

/* ---------- Announcements / Notifications ------------------------------- */
.acd-announce {
  background: var(--bg-1);
  border: 1px solid var(--line-1);
  border-left: 3px solid var(--sig-cyan);
  padding: 16px 20px;
  margin-bottom: 12px;
}
.acd-announce[data-sev="high"] { border-left-color: var(--sig-red); }
.acd-announce[data-sev="med"]  { border-left-color: var(--sig-amber); }
.acd-announce-meta {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--font-mono); font-size: 11px;
  color: var(--text-mid); margin-bottom: 6px;
}
.acd-announce-time { color: var(--text-lo); }
.acd-announce-title {
  font-family: var(--font-display); font-size: 18px; font-weight: 500;
  margin: 0 0 6px; letter-spacing: -0.3px;
}
.acd-announce-body { font-size: 13.5px; line-height: 1.6; color: var(--text-mid); margin: 0; }

/* ---------- Profile blocks (user + team) -------------------------------- */
.acd-profile-head {
  display: flex; gap: 24px; align-items: center;
  padding-bottom: 22px; border-bottom: 1px solid var(--line-1);
  margin-bottom: 22px;
}
.acd-profile-avatar {
  width: 72px; height: 72px;
  background: var(--bg-2);
  border: 1px solid var(--line-2);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono); font-size: 28px; font-weight: 700;
  color: var(--sig-green);
  flex-shrink: 0;
}
.acd-profile-name { font-family: var(--font-display); font-size: 26px; font-weight: 500; margin: 0; letter-spacing: -0.3px; }
.acd-profile-sub { font-family: var(--font-mono); font-size: 12px; color: var(--text-mid); margin-top: 6px; }
.acd-stat-row { display: flex; gap: 24px; }
.acd-stat {
  display: flex; flex-direction: column;
  align-items: flex-start;
}
.acd-stat .label {
  font-family: var(--font-mono); font-size: 10px;
  color: var(--text-lo); letter-spacing: 1px; text-transform: uppercase;
  margin-top: 6px;
}
.acd-stat .val {
  font-family: var(--font-mono); font-size: 22px; font-weight: 600;
  color: var(--text-hi); line-height: 1;
}
.acd-stat .val.amber { color: var(--sig-amber); }

/* ---------- 404 / error pages ------------------------------------------- */
.acd-err {
  flex: 1;
  display: flex; align-items: center; justify-content: center;
  position: relative; overflow: hidden;
  background: radial-gradient(ellipse at center, rgba(255,82,71,0.06) 0%, var(--bg-0) 70%);
}
.acd-err::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image: repeating-linear-gradient(
    to bottom,
    rgba(255, 255, 255, 0.025) 0px,
    rgba(255, 255, 255, 0.025) 1px,
    transparent 1px, transparent 3px
  );
}
.acd-err-inner {
  text-align: center; position: relative; z-index: 2;
  max-width: 540px; padding: 0 40px;
}
.acd-err-eyebrow {
  font-family: var(--font-mono); font-size: 11px;
  color: var(--sig-red); letter-spacing: 2px; text-transform: uppercase;
  margin-bottom: 24px;
}
.acd-err-code {
  font-family: var(--font-mono); font-size: 180px; font-weight: 700;
  line-height: 0.9; letter-spacing: -4px;
  background: linear-gradient(180deg, var(--text-hi) 30%, rgba(255,82,71,0.4) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: acd-flicker 5s infinite;
}
.acd-err-title {
  font-family: var(--font-display); font-size: 28px; font-weight: 500;
  margin: 20px 0 10px; letter-spacing: -0.4px; color: var(--text-hi);
}
.acd-err-text {
  font-size: 14px; line-height: 1.6; color: var(--text-mid);
  margin: 0 auto 28px; max-width: 380px;
}
.acd-err-actions { display: flex; gap: 10px; justify-content: center; }

/* ---------- Utility ----------------------------------------------------- */
.acd-mono { font-family: var(--font-mono); }
.acd-display { font-family: var(--font-display); }
.acd-mid { color: var(--text-mid); }
.acd-lo  { color: var(--text-lo); }
.acd-green { color: var(--sig-green); }
.acd-amber { color: var(--sig-amber); }
.acd-red   { color: var(--sig-red); }
.acd-cyan  { color: var(--sig-cyan); }

.acd-stack { display: flex; flex-direction: column; gap: 16px; }
.acd-row   { display: flex; align-items: center; gap: 12px; }
.acd-grow  { flex: 1; }

.acd-grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.acd-grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.acd-grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
@media (max-width: 900px) {
  .acd-grid-2, .acd-grid-3, .acd-grid-4 { grid-template-columns: 1fr; }
  .acd-auth { grid-template-columns: 1fr; }
  .acd-auth-hero { padding: 28px; min-height: 280px; }
  .acd-auth-form { padding: 32px 24px; }
  .acd-chal-shell { grid-template-columns: 1fr; }
  .acd-chal-side { border-right: none; border-bottom: 1px solid var(--line-1); }
}