/* Neon: dark terminal theme for CTFd. Loaded after the core theme's main.css. */

:root,
[data-bs-theme="dark"] {
  --neon: #39ff88;
  --neon-dim: #1fae5c;
  --cyan: #22d3ee;
  --magenta: #ff3d7f;
  --amber: #ffc857;
  --bg: #06080b;
  --surface: #0c1116;
  --surface-2: #111821;
  --line: #1c2733;
  --text: #d3dbe3;
  --muted: #7b8794;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;

  --bs-body-bg: var(--bg);
  --bs-body-color: var(--text);
  --bs-body-font-family: var(--sans);
  --bs-secondary-color: var(--muted);
  --bs-tertiary-bg: var(--surface);
  --bs-border-color: var(--line);
  --bs-primary: var(--neon);
  --bs-primary-rgb: 57, 255, 136;
  --bs-link-color: var(--neon);
  --bs-link-color-rgb: 57, 255, 136;
  --bs-link-hover-color: #8dffbc;
  --bs-link-hover-color-rgb: 141, 255, 188;
  --bs-emphasis-color: #fff;
  --bs-heading-color: #f2f6f9;
}

html { color-scheme: dark; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main { flex: 1; padding-top: 4.5rem; }

::selection { background: var(--neon); color: #000; }

/* ---------- Background: grid + glow + scanlines ---------- */
.neon-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(60rem 30rem at 15% -10%, rgba(57, 255, 136, .10), transparent 60%),
    radial-gradient(50rem 30rem at 100% 0%, rgba(34, 211, 238, .08), transparent 60%),
    linear-gradient(rgba(57, 255, 136, .035) 1px, transparent 1px) 0 0 / 40px 40px,
    linear-gradient(90deg, rgba(57, 255, 136, .035) 1px, transparent 1px) 0 0 / 40px 40px;
  mask-image: linear-gradient(to bottom, #000 0%, #000 50%, transparent 100%);
}
.neon-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(to bottom, rgba(255, 255, 255, .025) 0 1px, transparent 1px 3px);
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6, .navbar, .btn, .nav-link, th, .badge, code, pre, kbd {
  font-family: var(--mono);
}
h1, h2, h3, h4, h5, h6 { letter-spacing: -.01em; }
code { color: var(--cyan); }
pre {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1rem;
}
hr { border-color: var(--line); opacity: 1; }
.text-neon { color: var(--neon); }
.text-cyan { color: var(--cyan); }
.text-muted { color: var(--muted) !important; }

/* ---------- Navbar ---------- */
.navbar {
  background: rgba(6, 8, 11, .72) !important;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
  font-size: .9rem;
}
.navbar-brand {
  font-weight: 800;
  color: #fff !important;
  letter-spacing: -.02em;
}
.navbar-brand { display: inline-flex; align-items: center; gap: .55rem; }
.brand-mark { border-radius: 6px; box-shadow: 0 0 14px rgba(57, 255, 136, .35); }
.brand-cursor {
  display: inline-block;
  width: .55em;
  height: 1em;
  margin-left: .2em;
  vertical-align: -.12em;
  background: var(--neon);
  animation: blink 1.1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.navbar .nav-link { color: var(--muted) !important; transition: color .15s; }
.navbar .nav-link:hover,
.navbar .nav-link:focus-visible { color: var(--neon) !important; }
.navbar-toggler { border-color: var(--line); }

.dropdown-menu {
  --bs-dropdown-bg: var(--surface);
  --bs-dropdown-border-color: var(--line);
  --bs-dropdown-link-hover-bg: var(--surface-2);
  --bs-dropdown-link-active-bg: var(--neon);
  --bs-dropdown-link-active-color: #000;
}

/* ---------- Page headers (Challenges, Scoreboard, ...) ---------- */
.jumbotron {
  background: transparent;
  color: #fff;
  text-align: left;
  padding: 3rem 0 1.5rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--line);
}
.jumbotron .container { font-family: var(--mono); }
.jumbotron h1 {
  font-weight: 800;
  font-size: clamp(2rem, 4vw, 2.75rem);
}
.jumbotron h1::before {
  content: "$ ";
  color: var(--neon);
  text-shadow: 0 0 14px rgba(57, 255, 136, .55);
}

/* ---------- Buttons ---------- */
.btn { border-radius: 6px; font-weight: 600; letter-spacing: .01em; }
.btn-primary {
  --bs-btn-color: #03140a;
  --bs-btn-bg: var(--neon);
  --bs-btn-border-color: var(--neon);
  --bs-btn-hover-color: #000;
  --bs-btn-hover-bg: #6dffab;
  --bs-btn-hover-border-color: #6dffab;
  --bs-btn-active-color: #000;
  --bs-btn-active-bg: var(--neon-dim);
  --bs-btn-active-border-color: var(--neon-dim);
  --bs-btn-disabled-color: #03140a;
  --bs-btn-disabled-bg: var(--neon-dim);
  --bs-btn-disabled-border-color: var(--neon-dim);
  box-shadow: 0 0 0 rgba(57, 255, 136, 0);
  transition: box-shadow .2s, transform .2s, background-color .15s;
}
.btn-primary:hover { box-shadow: 0 0 24px rgba(57, 255, 136, .45); transform: translateY(-1px); }
.btn-outline-primary,
.btn-outline-secondary {
  --bs-btn-color: var(--neon);
  --bs-btn-border-color: rgba(57, 255, 136, .5);
  --bs-btn-hover-color: #000;
  --bs-btn-hover-bg: var(--neon);
  --bs-btn-hover-border-color: var(--neon);
  --bs-btn-active-color: #000;
  --bs-btn-active-bg: var(--neon);
  --bs-btn-active-border-color: var(--neon);
}
.btn-secondary, .btn-dark {
  --bs-btn-bg: var(--surface-2);
  --bs-btn-border-color: var(--line);
  --bs-btn-hover-bg: #17212c;
  --bs-btn-hover-border-color: #2a3a4a;
  --bs-btn-color: var(--text);
  --bs-btn-hover-color: #fff;
}
.btn-danger {
  --bs-btn-bg: var(--magenta);
  --bs-btn-border-color: var(--magenta);
  --bs-btn-hover-bg: #ff6b9c;
  --bs-btn-hover-border-color: #ff6b9c;
}

/* ---------- Forms ---------- */
.form-control, .form-select {
  background-color: var(--surface);
  border-color: var(--line);
  color: var(--text);
  font-family: var(--mono);
  font-size: .95rem;
}
.form-control:focus, .form-select:focus {
  background-color: var(--surface);
  color: #fff;
  border-color: var(--neon);
  box-shadow: 0 0 0 .2rem rgba(57, 255, 136, .18);
}
.form-control::placeholder { color: #4d5966; }
.form-label, label { color: var(--muted); font-size: .9rem; }

/* Center auth forms in a card */
form[method="post"] .form-group,
.form-group { margin-bottom: 1rem; }

/* ---------- Home hero ---------- */
.hero {
  padding: clamp(4rem, 12vh, 8rem) 0 3rem;
  text-align: center;
}
.hero-kicker {
  font-family: var(--mono);
  color: var(--muted);
  font-size: .95rem;
  margin-bottom: 1.25rem;
}
.hero-title {
  position: relative;
  display: inline-block;
  font-family: var(--mono);
  font-weight: 800;
  font-size: clamp(2.75rem, 9vw, 6.5rem);
  line-height: 1;
  letter-spacing: -.04em;
  color: #fff;
  text-shadow: 0 0 30px rgba(57, 255, 136, .35);
  margin-bottom: 1rem;
}
.hero-title::before,
.hero-title::after {
  content: attr(data-text);
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}
.hero-title::before {
  color: var(--cyan);
  transform: translate(-2px, 0);
  clip-path: inset(0 0 60% 0);
  mix-blend-mode: screen;
  animation: glitch-a 4s infinite steps(1);
}
.hero-title::after {
  color: var(--magenta);
  transform: translate(2px, 0);
  clip-path: inset(55% 0 0 0);
  mix-blend-mode: screen;
  animation: glitch-b 4s infinite steps(1);
}
@keyframes glitch-a {
  0%, 88%, 100% { transform: translate(0); opacity: 0; }
  89% { transform: translate(-4px, -1px); opacity: .9; }
  92% { transform: translate(3px, 1px); clip-path: inset(10% 0 70% 0); opacity: .9; }
  95% { transform: translate(-2px, 0); opacity: .9; }
}
@keyframes glitch-b {
  0%, 88%, 100% { transform: translate(0); opacity: 0; }
  90% { transform: translate(4px, 1px); opacity: .9; }
  93% { transform: translate(-3px, -1px); clip-path: inset(70% 0 5% 0); opacity: .9; }
  96% { transform: translate(2px, 0); opacity: .9; }
}
.hero-sub {
  color: var(--muted);
  font-size: clamp(1rem, 2vw, 1.2rem);
  margin-bottom: 2.25rem;
}
.hero-actions { display: flex; gap: .75rem; justify-content: center; flex-wrap: wrap; }
.hero-actions .btn-lg { padding: .8rem 1.5rem; font-size: 1rem; }

.countdown { margin: 0 auto 2.5rem; }
.countdown-label {
  font-family: var(--mono);
  color: var(--neon);
  font-size: .85rem;
  margin-bottom: .75rem;
}
.countdown-grid {
  display: inline-grid;
  grid-template-columns: repeat(4, minmax(4.5rem, 1fr));
  gap: .6rem;
}
.countdown-grid > div {
  background: rgba(12, 17, 22, .8);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: .8rem .5rem .6rem;
}
.countdown-grid span {
  display: block;
  font-family: var(--mono);
  font-weight: 800;
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  color: #fff;
  font-variant-numeric: tabular-nums;
}
.countdown-grid small {
  color: var(--muted);
  font-family: var(--mono);
  font-size: .7rem;
  text-transform: uppercase;
  letter-spacing: .12em;
}
.countdown.ended .countdown-grid { display: none; }

/* Admin-editable home page content, framed as a terminal window */
.terminal-card {
  max-width: 820px;
  margin: 0 auto 4rem;
  background: rgba(12, 17, 22, .85);
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, .45);
}
.terminal-bar {
  display: flex;
  align-items: center;
  gap: .45rem;
  padding: .7rem 1rem;
  background: var(--surface-2);
  border-bottom: 1px solid var(--line);
}
.terminal-bar span { width: 11px; height: 11px; border-radius: 50%; background: #2a3541; }
.terminal-bar span:nth-child(1) { background: #ff5f57; }
.terminal-bar span:nth-child(2) { background: #febc2e; }
.terminal-bar span:nth-child(3) { background: #28c840; }
.terminal-bar em {
  margin-left: auto;
  margin-right: auto;
  font-style: normal;
  font-family: var(--mono);
  font-size: .8rem;
  color: var(--muted);
}
.terminal-body { padding: 1.75rem 2rem; }
.terminal-body h3 { font-size: 1.5rem; font-weight: 800; color: #fff; }
.terminal-body h4 { font-size: 1rem; text-transform: uppercase; letter-spacing: .12em; color: var(--cyan); margin-top: 1.75rem; }
.terminal-body img { max-width: 100%; height: auto; }

/* The default CTFd index ships a big logo + "Powered by CTFd" block; tone it down */
.terminal-body .text-center h3 { font-family: var(--mono); }

.page-content { padding-top: 2rem; padding-bottom: 3rem; }

/* ---------- Challenge board ---------- */
.category-header h3 {
  display: flex;
  align-items: center;
  gap: .75rem;
  font-size: 1rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .14em;
  color: var(--cyan);
}
.category-header h3::before { content: "//"; color: var(--muted); }
.category-header h3::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--line), transparent);
}

.challenge-button {
  position: relative;
  min-height: 7.5rem;
  background: linear-gradient(180deg, var(--surface-2), var(--surface)) !important;
  border: 1px solid var(--line) !important;
  border-radius: 12px;
  box-shadow: none !important;
  color: var(--text) !important;
  overflow: hidden;
  transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}
.challenge-button::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: linear-gradient(90deg, var(--neon), var(--cyan));
  opacity: .35;
  transition: opacity .18s;
}
.challenge-button:hover,
.challenge-button:focus-visible {
  transform: translateY(-3px);
  border-color: rgba(57, 255, 136, .55) !important;
  box-shadow: 0 10px 30px rgba(57, 255, 136, .12), 0 0 0 1px rgba(57, 255, 136, .2) !important;
}
.challenge-button:hover::before { opacity: 1; }
.challenge-inner p {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 1.02rem;
  color: #fff;
  margin-bottom: .35rem;
}
.challenge-inner span {
  font-family: var(--mono);
  font-weight: 800;
  font-size: 1.35rem;
  color: var(--neon);
}
.challenge-inner span::after {
  content: " pts";
  font-size: .75rem;
  font-weight: 400;
  color: var(--muted);
}

.challenge-button.challenge-solved {
  background: linear-gradient(180deg, rgba(57, 255, 136, .12), rgba(57, 255, 136, .03)) !important;
  border-color: rgba(57, 255, 136, .45) !important;
}
.challenge-button.challenge-solved::before { opacity: 1; background: var(--neon); }
.challenge-button.challenge-solved::after {
  content: "\2713  SOLVED";
  position: absolute;
  top: .55rem;
  right: .7rem;
  font-family: var(--mono);
  font-size: .65rem;
  font-weight: 800;
  letter-spacing: .12em;
  color: var(--neon);
}
.challenge-button.challenge-solved .challenge-inner p { color: var(--neon); }
.challenge-button.challenge-solved .challenge-inner span { color: var(--muted); }

/* ---------- Modals (challenge window) ---------- */
.modal-content {
  background: var(--surface);
  border: 1px solid var(--line);
  border-top: 2px solid var(--neon);
  border-radius: 14px;
  box-shadow: 0 30px 80px rgba(0, 0, 0, .6), 0 0 40px rgba(57, 255, 136, .08);
}
.modal-header, .modal-footer { border-color: var(--line); }
.modal-backdrop.show { opacity: .75; }
.modal .challenge-name { font-family: var(--mono); font-weight: 800; color: #fff; }
.modal .challenge-value { font-family: var(--mono); color: var(--neon); }
.modal .nav-tabs { border-color: var(--line); }
.modal .nav-tabs .nav-link { color: var(--muted); border: none; }
.modal .nav-tabs .nav-link.active {
  background: transparent;
  color: var(--neon);
  border-bottom: 2px solid var(--neon);
}
.btn-close { filter: invert(1) grayscale(1) brightness(1.6); }

/* ---------- Tables / scoreboard ---------- */
.table {
  --bs-table-bg: transparent;
  --bs-table-striped-bg: rgba(255, 255, 255, .025);
  --bs-table-hover-bg: rgba(57, 255, 136, .05);
  --bs-table-border-color: var(--line);
  --bs-table-color: var(--text);
  --bs-table-striped-color: var(--text);
}
.table thead th {
  color: var(--muted);
  font-size: .75rem;
  text-transform: uppercase;
  letter-spacing: .12em;
  border-bottom-color: var(--line);
}
.table td, .table th { padding-top: .85rem; padding-bottom: .85rem; }
.table a { color: #fff; text-decoration: none; font-weight: 600; }
.table a:hover { color: var(--neon); }

#scoreboard tbody tr:nth-child(1) th { color: var(--amber); text-shadow: 0 0 12px rgba(255, 200, 87, .6); }
#scoreboard tbody tr:nth-child(2) th { color: #d6dde4; }
#scoreboard tbody tr:nth-child(3) th { color: #e08e5b; }
#scoreboard tbody tr:nth-child(-n+3) th { font-weight: 800; }
#scoreboard tbody td:last-child { font-family: var(--mono); color: var(--neon); font-weight: 600; }

#score-graph {
  background: rgba(12, 17, 22, .6);
  border: 1px solid var(--line);
  border-radius: 12px;
  margin: 1rem 0;
}

.nav-pills {
  --bs-nav-pills-link-active-bg: var(--neon);
  --bs-nav-pills-link-active-color: #000;
}
.nav-pills .nav-link { color: var(--muted); }

/* ---------- Frozen scoreboard ---------- */
.freeze-banner {
  --ice: #7fe7ff;
  position: relative;
  display: flex;
  align-items: center;
  gap: 1.1rem;
  margin: 1.5rem 0 1rem;
  padding: 1.1rem 1.4rem;
  overflow: hidden;
  border: 1px solid rgba(127, 231, 255, .45);
  border-radius: 14px;
  background:
    linear-gradient(135deg, rgba(127, 231, 255, .16), rgba(34, 211, 238, .04) 55%, rgba(127, 231, 255, .10)),
    rgba(8, 16, 22, .85);
  box-shadow: 0 0 0 1px rgba(127, 231, 255, .08) inset, 0 0 40px rgba(34, 211, 238, .15);
  font-family: var(--mono);
  backdrop-filter: blur(6px);
  animation: freeze-in .9s cubic-bezier(.2, .9, .3, 1.2) both;
}
/* light sweeping across the ice */
.freeze-banner::after {
  content: "";
  position: absolute;
  inset: -50% auto -50% -30%;
  width: 30%;
  background: linear-gradient(100deg, transparent, rgba(255, 255, 255, .16), transparent);
  transform: skewX(-20deg);
  animation: freeze-shimmer 4.5s ease-in-out 1s infinite;
  pointer-events: none;
}
@keyframes freeze-in {
  from { opacity: 0; transform: translateY(-12px) scale(.98); filter: blur(4px); }
  to { opacity: 1; transform: none; filter: none; }
}
@keyframes freeze-shimmer {
  0% { left: -30%; }
  45%, 100% { left: 130%; }
}

.freeze-snow { position: absolute; inset: 0; pointer-events: none; }
.freeze-snow span {
  position: absolute;
  top: -8px;
  left: var(--x);
  width: var(--size);
  height: var(--size);
  border-radius: 50%;
  background: #fff;
  opacity: .7;
  box-shadow: 0 0 6px rgba(127, 231, 255, .9);
  animation: freeze-fall var(--dur) linear var(--delay) infinite;
}
@keyframes freeze-fall {
  to { transform: translate(var(--drift), 120px); opacity: 0; }
}

.freeze-icon {
  position: relative;
  flex: none;
  display: grid;
  place-items: center;
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(127, 231, 255, .22), transparent 70%);
}
.freeze-icon i {
  font-size: 1.7rem;
  color: var(--ice);
  text-shadow: 0 0 16px rgba(127, 231, 255, .9);
  animation: freeze-spin-in 1.2s cubic-bezier(.2, .8, .2, 1) both, freeze-spin 14s linear 1.2s infinite, freeze-pulse 3s ease-in-out 1.2s infinite;
}
@keyframes freeze-spin-in { from { transform: rotate(-360deg) scale(.2); opacity: 0; } to { transform: none; opacity: 1; } }
@keyframes freeze-spin { to { transform: rotate(360deg); } }
@keyframes freeze-pulse { 50% { text-shadow: 0 0 28px rgba(127, 231, 255, 1), 0 0 6px #fff; } }

.freeze-text { position: relative; flex: 1; min-width: 0; }
.freeze-text strong {
  display: block;
  color: #eafcff;
  text-transform: uppercase;
  letter-spacing: .16em;
  font-size: .95rem;
  text-shadow: 0 0 12px rgba(127, 231, 255, .5);
}
.freeze-text span { color: #9fb4c2; font-size: .85rem; }
.freeze-text b { color: var(--ice); font-weight: 600; }

.freeze-reveal {
  position: relative;
  flex: none;
  text-align: right;
  padding-left: 1.2rem;
  border-left: 1px solid rgba(127, 231, 255, .25);
}
.freeze-reveal small {
  display: block;
  color: #7b8794;
  font-size: .68rem;
  text-transform: uppercase;
  letter-spacing: .16em;
}
.freeze-reveal span {
  color: #fff;
  font-weight: 800;
  font-size: 1.35rem;
  font-variant-numeric: tabular-nums;
  text-shadow: 0 0 14px rgba(127, 231, 255, .6);
}

/* Frost creeping over the graph and standings */
.is-frozen #score-graph,
.is-frozen #scoreboard > .col-md-12:last-of-type,
.is-frozen #scoreboard .table { position: relative; }
.is-frozen #score-graph {
  border-color: rgba(127, 231, 255, .35);
  box-shadow: 0 0 30px rgba(34, 211, 238, .08) inset;
  filter: saturate(.55) hue-rotate(25deg);
}
.is-frozen #score-graph::after,
.is-frozen #scoreboard .table::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  border-radius: 12px;
  background:
    radial-gradient(60% 90% at 0% 0%, rgba(200, 245, 255, .16), transparent 60%),
    radial-gradient(50% 80% at 100% 100%, rgba(200, 245, 255, .14), transparent 60%),
    radial-gradient(35% 60% at 100% 0%, rgba(200, 245, 255, .10), transparent 60%);
  animation: frost-creep 1.6s ease-out .3s both;
}
@keyframes frost-creep {
  from { opacity: 0; clip-path: circle(0% at 0% 0%); }
  to { opacity: 1; clip-path: circle(150% at 0% 0%); }
}
.is-frozen #scoreboard .table {
  --bs-table-striped-bg: rgba(127, 231, 255, .035);
  --bs-table-border-color: rgba(127, 231, 255, .14);
}
.is-frozen #scoreboard tbody td:last-child {
  color: #7fe7ff;
  text-shadow: 0 0 10px rgba(127, 231, 255, .55);
}
.is-frozen #scoreboard tbody td:last-child::after {
  content: " \2744";
  font-size: .75em;
  opacity: .7;
}


@media (max-width: 576px) {
  .freeze-banner { flex-wrap: wrap; }
  .freeze-reveal { width: 100%; text-align: left; padding: .6rem 0 0; border-left: 0; border-top: 1px solid rgba(127, 231, 255, .25); }
}
@media (prefers-reduced-motion: reduce) {
  .freeze-banner, .freeze-banner::after, .freeze-snow span, .freeze-icon i,
  .is-frozen #score-graph::after, .is-frozen #scoreboard .table::after { animation: none; }
  .freeze-snow { display: none; }
}

/* ---------- Next challenge wave ---------- */
.wave-banner {
  position: relative;
  display: flex;
  align-items: center;
  gap: 1.1rem;
  margin: 1.5rem 0 .5rem;
  padding: 1.1rem 1.4rem;
  overflow: hidden;
  border: 1px solid rgba(34, 211, 238, .4);
  border-radius: 14px;
  background: linear-gradient(120deg, rgba(34, 211, 238, .12), rgba(57, 255, 136, .05)), rgba(8, 14, 20, .85);
  font-family: var(--mono);
}
.wave-banner::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(34, 211, 238, .14), transparent);
  transform: translateX(-100%);
  animation: wave-scan 3.5s ease-in-out infinite;
  pointer-events: none;
}
@keyframes wave-scan { 60%, 100% { transform: translateX(100%); } }
.wave-icon {
  flex: none;
  display: grid;
  place-items: center;
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(34, 211, 238, .25), transparent 70%);
  font-size: 1.5rem;
  color: var(--cyan);
  text-shadow: 0 0 14px rgba(34, 211, 238, .8);
}
.wave-icon i { animation: wave-bob 2.4s ease-in-out infinite; }
@keyframes wave-bob { 50% { transform: translateY(-3px); } }
.wave-text { position: relative; flex: 1; min-width: 0; }
.wave-text strong { display: block; color: #fff; text-transform: uppercase; letter-spacing: .16em; font-size: .95rem; }
.wave-text span { color: #9fb4c2; font-size: .85rem; }
.wave-text b { color: var(--cyan); }
.wave-countdown {
  position: relative;
  flex: none;
  text-align: right;
  padding-left: 1.2rem;
  border-left: 1px solid rgba(34, 211, 238, .25);
}
.wave-countdown small { display: block; color: var(--muted); font-size: .68rem; text-transform: uppercase; letter-spacing: .16em; }
.wave-countdown span {
  color: #fff;
  font-weight: 800;
  font-size: 1.35rem;
  font-variant-numeric: tabular-nums;
  text-shadow: 0 0 14px rgba(34, 211, 238, .6);
}
.wave-banner.landing { border-color: var(--neon); box-shadow: 0 0 40px rgba(57, 255, 136, .25); }
.wave-banner.landing .wave-countdown span { color: var(--neon); animation: blink 1s steps(1) infinite; }
@media (max-width: 576px) {
  .wave-banner { flex-wrap: wrap; }
  .wave-countdown { width: 100%; text-align: left; padding: .6rem 0 0; border-left: 0; border-top: 1px solid rgba(34, 211, 238, .25); }
}
@media (prefers-reduced-motion: reduce) {
  .wave-banner::before, .wave-icon i { animation: none; }
}

/* ---------- Cards, alerts, badges, misc ---------- */
.card {
  --bs-card-bg: var(--surface);
  --bs-card-border-color: var(--line);
  border-radius: 12px;
}
.alert {
  border-radius: 8px;
  font-family: var(--mono);
  font-size: .9rem;
}
.alert-success { background: rgba(57, 255, 136, .08); border-color: rgba(57, 255, 136, .35); color: var(--neon); }
.alert-danger { background: rgba(255, 61, 127, .08); border-color: rgba(255, 61, 127, .4); color: #ff86ad; }
.alert-info { background: rgba(34, 211, 238, .08); border-color: rgba(34, 211, 238, .35); color: var(--cyan); }
.alert-warning { background: rgba(255, 200, 87, .08); border-color: rgba(255, 200, 87, .35); color: var(--amber); }
.badge.bg-secondary { background: var(--surface-2) !important; border: 1px solid var(--line); color: var(--muted); }
.bg-danger { background-color: var(--magenta) !important; }
.spinner, .fa-spin { color: var(--neon); }

/* ---------- Footer ---------- */
.footer {
  padding: 1.5rem 0;
  border-top: 1px solid var(--line);
  font-family: var(--mono);
  background: transparent;
}

/* ---------- Motion preferences ---------- */
@media (prefers-reduced-motion: reduce) {
  .brand-cursor, .hero-title::before, .hero-title::after { animation: none; }
  .challenge-button, .btn-primary { transition: none; }
}