/* ==========================================================================
   hackathon theme — theme.css
   Layered on top of core's compiled Bootstrap 5.3 build (loaded first).
   Bootstrap is themed through its own CSS custom properties; every component
   rule below reads our --hx-* tokens. The colour-mode toggle is honoured by
   mapping both data-bs-theme values to coherent palettes (dark = terminal,
   light = daylight terminal), so nothing is monkey-patched.
   ========================================================================== */

/* --- 1. Fonts (self-hosted, latin subset) -------------------------------- */
@font-face { font-family: "IBM Plex Sans"; font-style: normal; font-weight: 400; font-display: swap;
  src: url("../fonts/sans-400.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Sans"; font-style: normal; font-weight: 500; font-display: swap;
  src: url("../fonts/sans-500.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Sans"; font-style: normal; font-weight: 600; font-display: swap;
  src: url("../fonts/sans-600.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Sans"; font-style: normal; font-weight: 700; font-display: swap;
  src: url("../fonts/sans-700.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Mono"; font-style: normal; font-weight: 400; font-display: swap;
  src: url("../fonts/mono-400.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Mono"; font-style: normal; font-weight: 500; font-display: swap;
  src: url("../fonts/mono-500.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Mono"; font-style: normal; font-weight: 600; font-display: swap;
  src: url("../fonts/mono-600.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Mono"; font-style: normal; font-weight: 700; font-display: swap;
  src: url("../fonts/mono-700.woff2") format("woff2"); }

/* --- 2. Tokens ----------------------------------------------------------- */
:root {
  --hx-bg:      #05070a;
  --hx-bg-2:    #080c13;
  --hx-panel:   #0a0e14;
  --hx-raised:  #0f1520;
  --hx-line:    #1b2636;
  --hx-line-2:  #28374f;
  --hx-fg:      #d7e3f4;
  --hx-fg-dim:  #8ba0be;
  --hx-fg-mute: #5a6b85;

  --hx-accent:  #35ff9a;   /* primary action / solved / live */
  --hx-cyan:    #22e0ff;   /* links / interactive / info   */
  --hx-magenta: #ff3ea5;   /* event identity / top rank    */
  --hx-amber:   #ffb020;   /* in progress / warning        */
  --hx-red:     #ff4d5e;   /* error / failed               */
  --hx-ink:     #04140c;   /* text on accent fill          */

  --hx-radius:    4px;
  --hx-radius-lg: 8px;
  --hx-glow-accent: 0 0 0 1px rgba(53,255,154,.20), 0 0 20px rgba(53,255,154,.10);
  --hx-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --hx-sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;

  --hx-rain: rgba(53,255,154,.55);
  --hx-grid-line: rgba(40,55,79,.35);
  --hx-scan: rgba(0,0,0,.28);
  --hx-veil: rgba(5,7,10,.72);
}

/* Daylight terminal variant (Bootstrap light mode) */
[data-bs-theme="light"] {
  --hx-bg:      #eef2f7;
  --hx-bg-2:    #e6ecf4;
  --hx-panel:   #ffffff;
  --hx-raised:  #f5f8fc;
  --hx-line:    #ccd6e2;
  --hx-line-2:  #b3c1d3;
  --hx-fg:      #0e1723;
  --hx-fg-dim:  #46586f;
  --hx-fg-mute: #6b7c93;
  --hx-accent:  #0b8f52;
  --hx-cyan:    #0b7fa8;
  --hx-magenta: #c01e6f;
  --hx-amber:   #b06f00;
  --hx-red:     #c22a3a;
  --hx-ink:     #ffffff;
  --hx-glow-accent: 0 0 0 1px rgba(11,143,82,.25), 0 0 16px rgba(11,143,82,.10);
  --hx-rain: rgba(11,143,82,.35);
  --hx-grid-line: rgba(179,193,211,.45);
  --hx-scan: rgba(0,0,0,.05);
  --hx-veil: rgba(238,242,247,.6);
}

/* --- 3. Bootstrap variable bridge --------------------------------------- */
:root, [data-bs-theme="dark"], [data-bs-theme="light"] {
  --bs-body-bg: var(--hx-bg);
  --bs-body-color: var(--hx-fg);
  --bs-body-font-family: var(--hx-sans);
  --bs-emphasis-color: #f2f7ff;
  --bs-secondary-color: var(--hx-fg-dim);
  --bs-tertiary-color: var(--hx-fg-mute);
  --bs-border-color: var(--hx-line);
  --bs-border-color-translucent: rgba(40,55,79,.55);
  --bs-secondary-bg: var(--hx-panel);
  --bs-tertiary-bg: var(--hx-raised);
  --bs-dark: var(--hx-panel);
  --bs-dark-rgb: 10,14,20;
  --bs-black: #05070a;
  --bs-primary: var(--hx-accent);
  --bs-primary-rgb: 53,255,154;
  --bs-link-color: var(--hx-cyan);
  --bs-link-color-rgb: 34,224,255;
  --bs-link-hover-color: var(--hx-accent);
  --bs-success: var(--hx-accent);
  --bs-info: var(--hx-cyan);
  --bs-warning: var(--hx-amber);
  --bs-danger: var(--hx-red);
  --bs-modal-bg: var(--hx-panel);
  --bs-modal-border-color: var(--hx-line-2);
  --bs-dropdown-bg: var(--hx-panel);
  --bs-dropdown-link-hover-bg: rgba(34,224,255,.10);
  --bs-table-bg: transparent;
  --bs-table-color: var(--hx-fg);
  --bs-table-border-color: var(--hx-line);
  --bs-table-striped-bg: rgba(255,255,255,.018);
  --bs-table-striped-color: var(--hx-fg);
  --bs-focus-ring-color: rgba(34,224,255,.45);
  color-scheme: dark;
}
[data-bs-theme="light"] { color-scheme: light; --bs-emphasis-color: #0b1119; }

/* --- 4. Base elements ---------------------------------------------------- */
html { background: var(--hx-bg); }
body.hx-body {
  background: var(--hx-bg);
  color: var(--hx-fg);
  font-family: var(--hx-sans);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
h1, h2, h3, h4, h5, h6,
.hx-mono, code, kbd, samp, pre {
  font-family: var(--hx-mono);
}
h1, h2, h3, h4 { font-weight: 600; letter-spacing: .04em; }
h5, h6 { font-weight: 600; letter-spacing: .02em; }
a { color: var(--hx-cyan); text-decoration: none; transition: color .15s ease, text-shadow .15s ease; }
a:hover, a:focus { color: var(--hx-accent); }
hr { border-color: var(--hx-line); opacity: 1; }
::selection { background: rgba(53,255,154,.28); color: #fff; }
[data-bs-theme="light"] ::selection { background: rgba(11,143,82,.22); color: #06131d; }
:focus-visible { outline: 2px solid var(--hx-cyan); outline-offset: 2px; border-radius: 2px; }
.text-muted { color: var(--hx-fg-mute) !important; }
.text-secondary { color: var(--hx-fg-dim) !important; }

::-webkit-scrollbar { width: 11px; height: 11px; }
::-webkit-scrollbar-track { background: var(--hx-bg-2); }
::-webkit-scrollbar-thumb { background: var(--hx-line-2); border: 2px solid var(--hx-bg-2); border-radius: 8px; }
::-webkit-scrollbar-thumb:hover { background: var(--hx-accent); }

main.hx-main { padding-top: 3.5rem; margin-bottom: 0; flex: 1 0 auto; }

/* --- 5. Ambient layers --------------------------------------------------- */
.hx-aurora {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background:
    radial-gradient(1100px 600px at 12% -8%, rgba(53,255,154,.10), transparent 60%),
    radial-gradient(900px 520px at 88% 4%, rgba(34,224,255,.09), transparent 62%),
    radial-gradient(800px 700px at 50% 118%, rgba(255,62,165,.07), transparent 60%);
}
.hx-rain { position: fixed; inset: 0; z-index: 0; pointer-events: none; opacity: .5; }
.hx-grid {
  position: fixed; inset: 0; z-index: 0; pointer-events: none; opacity: .55;
  background-image:
    linear-gradient(var(--hx-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--hx-grid-line) 1px, transparent 1px);
  background-size: 56px 56px, 56px 56px;
  mask-image: radial-gradient(ellipse 120% 90% at 50% 0%, #000 25%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse 120% 90% at 50% 0%, #000 25%, transparent 78%);
}
.hx-scanlines {
  position: fixed; inset: 0; z-index: 3; pointer-events: none; opacity: .35;
  background: repeating-linear-gradient(to bottom, var(--hx-scan) 0 1px, transparent 1px 3px);
  mix-blend-mode: multiply;
  animation: hx-flicker 7s steps(60) infinite;
}
[data-bs-theme="light"] .hx-scanlines { mix-blend-mode: normal; }
.hx-shell {
  /* position: relative ONLY — deliberately no z-index. Any z-index here creates a
     stacking context, which traps Bootstrap's modals: the modal is nested inside
     this shell while its backdrop is appended to <body>, so the backdrop
     (z-index 1050, root context) paints over the modal (1055, local context) and
     swallows every click — a dark screen you cannot dismiss. The shell still
     paints above the z-index:0 ambient layers because it comes later in the DOM. */
  position: relative;
  /* Flex column so a short page still pushes the footer to the viewport bottom
     (main grows to absorb the free space). */
  display: flex; flex-direction: column;
  min-height: 100vh;
}
@supports (min-height: 100dvh) { .hx-shell { min-height: 100dvh; } }

/* Quiet variant for content-dense working pages (challenge board, scoreboard,
   listings, settings). The ambient layers recede so they do not compete with the
   data being read. The terminal character stays — dark ground, faint grid, a
   whisper of scanline — but the moving glyph rain and the flicker switch off. */
.hx-quiet .hx-rain { display: none; }
.hx-quiet .hx-aurora { opacity: .5; }
.hx-quiet .hx-grid { opacity: .28; }
.hx-quiet .hx-scanlines { opacity: .12; animation: none; }

/* --- 6. Typography & glitch --------------------------------------------- */
.hx-kicker {
  font-family: var(--hx-mono); font-size: .72rem; letter-spacing: .3em;
  text-transform: uppercase; color: var(--hx-accent); margin: 0 0 .6rem;
  opacity: .9;
}
.hx-dim { color: var(--hx-fg-dim); }
.hx-sep { color: var(--hx-fg-mute); margin: 0 .5rem; }
.hx-ascii {
  font-family: var(--hx-mono); font-size: .74rem; line-height: 1.35;
  color: var(--hx-fg-mute); white-space: pre; margin: 1.6rem 0 0;
  border-left: 2px solid var(--hx-line-2); padding-left: .9rem;
}
.hx-glitch { position: relative; display: inline-block; color: var(--hx-fg); }
.hx-glitch::before,
.hx-glitch::after {
  content: attr(data-text);
  position: absolute; inset: 0; pointer-events: none;
  clip-path: inset(0 0 100% 0);
}
.hx-glitch::before { color: var(--hx-cyan); transform: translate(-2px, 0); animation: hx-glitch-a 5.5s infinite steps(2, end); }
.hx-glitch::after  { color: var(--hx-magenta); transform: translate(2px, 0); animation: hx-glitch-b 6.7s infinite steps(2, end); }

/* --- 7. Navbar ----------------------------------------------------------- */
.hx-nav {
  background: color-mix(in srgb, var(--hx-bg) 82%, transparent) !important;
  backdrop-filter: blur(10px) saturate(1.1);
  border-bottom: 1px solid var(--hx-line);
  padding-block: .35rem;
}
.hx-nav-underline {
  position: absolute; left: 0; right: 0; bottom: -1px; height: 1px;
  background: linear-gradient(90deg, transparent, var(--hx-accent), var(--hx-cyan), transparent);
  opacity: .55;
}
.hx-brand { display: inline-flex; align-items: center; gap: .55rem; color: var(--hx-fg) !important; }
.hx-sigil { display: inline-flex; color: var(--hx-accent); filter: drop-shadow(0 0 6px rgba(53,255,154,.45)); }
.hx-brand-logo { height: 25px; }
.hx-brand-text {
  font-family: var(--hx-mono); font-weight: 600; font-size: 1.0rem; letter-spacing: .06em;
  color: var(--hx-fg);
}
.hx-brand:hover .hx-brand-text { color: var(--hx-accent); }
.hx-caret {
  display: inline-block; width: 8px; height: 1.05em; margin-left: -2px;
  background: var(--hx-accent); animation: hx-blink 1.1s steps(1) infinite;
}
.hx-nav-link {
  font-family: var(--hx-mono); font-size: .82rem; letter-spacing: .04em;
  color: var(--hx-fg-dim) !important; position: relative; padding-inline: .7rem !important;
}
.hx-nav-link:hover, .hx-nav-link:focus, .hx-nav-link.active { color: var(--hx-fg) !important; }
.hx-nav-link::after {
  content: ""; position: absolute; left: .7rem; right: .7rem; bottom: .28rem; height: 1px;
  background: var(--hx-accent); transform: scaleX(0); transform-origin: left;
  transition: transform .18s ease;
}
.hx-nav-link:hover::after, .hx-nav-link:focus::after { transform: scaleX(1); }
.hx-toggler { border-color: var(--hx-line-2); }
.navbar-toggler-icon {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3E%3Cpath stroke='%2335ff9a' stroke-width='2' stroke-linecap='square' d='M4 8h22M4 15h22M4 22h22'/%3E%3C/svg%3E");
}
.navbar .dropdown-menu { border-color: var(--hx-line-2); box-shadow: 0 12px 34px rgba(0,0,0,.5); }
[data-bs-theme="dark"] .navbar .dropdown-menu { background: var(--hx-panel); }
.navbar .dropdown-item { font-family: var(--hx-mono); font-size: .82rem; }

/* --- 8. Buttons ---------------------------------------------------------- */
.btn { font-family: var(--hx-mono); font-size: .84rem; letter-spacing: .03em;
  border-radius: var(--hx-radius); transition: transform .12s ease, box-shadow .18s ease, background-color .18s ease, color .18s ease, border-color .18s ease; }
.btn:active { transform: translateY(1px); }
.hx-btn { padding: .6rem 1.15rem; }

.btn-primary, .btn-success {
  --bs-btn-bg: var(--hx-accent);
  --bs-btn-border-color: var(--hx-accent);
  --bs-btn-color: var(--hx-ink);
  --bs-btn-hover-bg: color-mix(in srgb, var(--hx-accent) 84%, #ffffff);
  --bs-btn-hover-border-color: color-mix(in srgb, var(--hx-accent) 84%, #ffffff);
  --bs-btn-hover-color: var(--hx-ink);
  --bs-btn-active-bg: color-mix(in srgb, var(--hx-accent) 74%, #000000);
  --bs-btn-active-color: var(--hx-ink);
  --bs-btn-disabled-bg: var(--hx-line-2);
  --bs-btn-disabled-border-color: var(--hx-line-2);
  font-weight: 600; position: relative; overflow: hidden;
}
.btn-primary::after {
  content: ""; position: absolute; top: 0; bottom: 0; left: -60%; width: 40%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,.5), transparent);
  transform: skewX(-18deg); opacity: 0; pointer-events: none;
}
.btn-primary:hover::after { animation: hx-sweep .7s ease forwards; }

.hx-btn-primary {
  background: var(--hx-accent); color: var(--hx-ink); border: 1px solid var(--hx-accent);
  font-weight: 600; box-shadow: var(--hx-glow-accent);
}
.hx-btn-primary:hover { background: color-mix(in srgb, var(--hx-accent) 85%, #fff); color: var(--hx-ink); }
.hx-btn-ghost {
  background: transparent; color: var(--hx-cyan); border: 1px solid var(--hx-line-2);
}
.hx-btn-ghost:hover { border-color: var(--hx-cyan); color: var(--hx-cyan); background: rgba(34,224,255,.08); }
.hx-btn-link { background: none; border: none; color: var(--hx-fg-dim); }
.hx-btn-link:hover { color: var(--hx-accent); }

.btn-outline-secondary, .btn-outline-info, .btn-outline-success, .btn-outline-danger { font-weight: 500; }
.btn-outline-secondary { --bs-btn-color: var(--hx-fg-dim); --bs-btn-border-color: var(--hx-line-2);
  --bs-btn-hover-bg: var(--hx-raised); --bs-btn-hover-border-color: var(--hx-cyan); --bs-btn-hover-color: var(--hx-cyan); }
.btn-outline-info { --bs-btn-color: var(--hx-cyan); --bs-btn-border-color: color-mix(in srgb, var(--hx-cyan) 45%, transparent);
  --bs-btn-hover-bg: rgba(34,224,255,.12); --bs-btn-hover-border-color: var(--hx-cyan); --bs-btn-hover-color: var(--hx-cyan); }
.btn-outline-success { --bs-btn-color: var(--hx-accent); --bs-btn-border-color: color-mix(in srgb, var(--hx-accent) 45%, transparent);
  --bs-btn-hover-bg: rgba(53,255,154,.12); --bs-btn-hover-border-color: var(--hx-accent); --bs-btn-hover-color: var(--hx-accent); }
.btn-outline-danger { --bs-btn-color: var(--hx-red); --bs-btn-border-color: color-mix(in srgb, var(--hx-red) 45%, transparent);
  --bs-btn-hover-bg: rgba(255,77,94,.12); --bs-btn-hover-border-color: var(--hx-red); --bs-btn-hover-color: var(--hx-red); }
.btn-info { --bs-btn-bg: var(--hx-cyan); --bs-btn-border-color: var(--hx-cyan); --bs-btn-color: var(--hx-ink);
  --bs-btn-hover-bg: color-mix(in srgb, var(--hx-cyan) 85%, #fff); --bs-btn-hover-color: var(--hx-ink); }
.btn-secondary { --bs-btn-bg: var(--hx-raised); --bs-btn-border-color: var(--hx-line-2); --bs-btn-color: var(--hx-fg);
  --bs-btn-hover-bg: var(--hx-line-2); --bs-btn-hover-color: var(--hx-fg); }
.btn-dark { --bs-btn-bg: var(--hx-raised); --bs-btn-border-color: var(--hx-line-2); --bs-btn-color: var(--hx-fg); }

/* --- 9. Forms ------------------------------------------------------------ */
/* background-COLOR, never the `background` shorthand: Bootstrap builds
   .form-select's chevron from background-image + no-repeat + background-size +
   background-position, and the shorthand resets all four to their initial values
   — which tiles the arrow across the whole control ("lots of weird arrows"). */
.form-control, .form-select, textarea.form-control {
  background-color: var(--hx-bg-2); border: 1px solid var(--hx-line-2); color: var(--hx-fg);
  font-family: var(--hx-mono); font-size: .88rem; border-radius: var(--hx-radius);
}
.form-control:focus, .form-select:focus {
  background-color: var(--hx-bg-2); color: var(--hx-fg);
  border-color: var(--hx-accent); box-shadow: 0 0 0 3px rgba(53,255,154,.16);
}
.form-control::placeholder { color: var(--hx-fg-mute); }
.form-label { font-family: var(--hx-mono); font-size: .8rem; letter-spacing: .05em;
  text-transform: uppercase; color: var(--hx-fg-dim); }
.form-text { font-size: .78rem; }
b > .form-label, b .form-label { color: var(--hx-fg); }
[data-bs-theme="dark"] .form-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 4 5'%3E%3Cpath fill='%2335ff9a' d='M2 0L0 2h4zm0 5L0 3h4z'/%3E%3C/svg%3E");
}
input[type="checkbox"], input[type="radio"] { accent-color: var(--hx-accent); }
.form-check-input { background-color: var(--hx-bg-2); border-color: var(--hx-line-2); }
.form-check-input:checked { background-color: var(--hx-accent); border-color: var(--hx-accent); }

/* --- 10. Panels / cards / modals ---------------------------------------- */
.hx-panel {
  background: linear-gradient(180deg, var(--hx-panel), var(--hx-bg-2));
  border: 1px solid var(--hx-line); border-radius: var(--hx-radius-lg);
  position: relative; overflow: hidden;
}
.hx-panel::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: linear-gradient(180deg, rgba(53,255,154,.05), transparent 40%);
}
.hx-panel-head {
  display: flex; align-items: center; gap: .5rem;
  padding: .55rem .9rem; border-bottom: 1px solid var(--hx-line);
  background: var(--hx-bg-2); font-family: var(--hx-mono); font-size: .78rem; color: var(--hx-fg-dim);
}
.hx-panel-title { letter-spacing: .06em; }
.hx-panel-dots { display: inline-flex; gap: 5px; }
.hx-panel-dots i { width: 9px; height: 9px; border-radius: 50%; background: var(--hx-line-2); }
.hx-panel-dots i:nth-child(1) { background: var(--hx-red); }
.hx-panel-dots i:nth-child(2) { background: var(--hx-amber); }
.hx-panel-dots i:nth-child(3) { background: var(--hx-accent); }

.card { background: var(--hx-panel); border: 1px solid var(--hx-line); border-radius: var(--hx-radius-lg); }
.card-header, .card-footer { background: var(--hx-bg-2); border-color: var(--hx-line); }
.modal-content { background: var(--hx-panel); border: 1px solid var(--hx-line-2); border-radius: var(--hx-radius-lg); box-shadow: 0 24px 70px rgba(0,0,0,.6); }
.modal-header, .modal-footer { border-color: var(--hx-line); }
.modal-header { background: var(--hx-bg-2); }
.modal-title { font-family: var(--hx-mono); }
.modal-backdrop.show { opacity: .72; }
.popover, .tooltip-inner { font-family: var(--hx-mono); font-size: .78rem; }
[data-bs-theme="dark"] .popover { background: var(--hx-panel); border-color: var(--hx-line-2); }
[data-bs-theme="dark"] .popover-header { background: var(--hx-bg-2); border-color: var(--hx-line); }
.tooltip-inner { background: #04140c; color: var(--hx-accent); border: 1px solid var(--hx-line-2); }

/* --- 11. Jumbotron / page hero ------------------------------------------ */
[data-bs-theme] .jumbotron {
  background:
    linear-gradient(180deg, rgba(53,255,154,.07), transparent 70%),
    var(--hx-bg-2);
  color: var(--hx-fg);
  border-bottom: 1px solid var(--hx-line);
  text-align: left;
  position: relative;
  overflow: hidden;
}
[data-bs-theme] .jumbotron::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image: linear-gradient(var(--hx-grid-line) 1px, transparent 1px),
                    linear-gradient(90deg, var(--hx-grid-line) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: radial-gradient(ellipse 70% 120% at 100% 0%, #000, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 70% 120% at 100% 0%, #000, transparent 70%);
  opacity: .5;
}
[data-bs-theme] .jumbotron .container { position: relative; z-index: 1; }
[data-bs-theme] .jumbotron h1 {
  font-size: clamp(1.5rem, 3.4vw, 2.5rem); letter-spacing: .06em; text-transform: uppercase;
  margin: 0;
}
[data-bs-theme] .jumbotron h1::before {
  content: "› "; color: var(--hx-accent);
}

/* --- 12. Challenge board + modal ---------------------------------------- */
[data-bs-theme] .category-header h3 {
  font-family: var(--hx-mono); text-transform: uppercase; letter-spacing: .14em;
  font-size: 1rem; color: var(--hx-cyan); margin: 0;
  display: flex; align-items: center; gap: .7rem;
}
[data-bs-theme] .category-header h3::after {
  content: ""; flex: 1; height: 1px; background: linear-gradient(90deg, var(--hx-line-2), transparent);
}
[data-bs-theme] .challenge-button {
  background: var(--hx-panel);
  border: 1px solid var(--hx-line-2) !important;
  border-radius: var(--hx-radius);
  box-shadow: none;
  position: relative;
  overflow: hidden;
  transition: transform .14s ease, border-color .18s ease, box-shadow .2s ease, background-color .2s ease;
  min-height: 108px;
}
[data-bs-theme] .challenge-button::before,
[data-bs-theme] .challenge-button::after {
  content: ""; position: absolute; width: 14px; height: 14px; border: 2px solid var(--hx-accent);
  opacity: 0; transition: opacity .18s ease, transform .18s ease; pointer-events: none;
}
[data-bs-theme] .challenge-button::before { top: 7px; left: 7px; border-right: none; border-bottom: none; transform: translate(-3px,-3px); }
[data-bs-theme] .challenge-button::after { bottom: 7px; right: 7px; border-left: none; border-top: none; transform: translate(3px,3px); }
[data-bs-theme] .challenge-button:hover {
  background: var(--hx-raised); border-color: var(--hx-accent) !important;
  box-shadow: 0 0 0 1px rgba(53,255,154,.25), 0 10px 30px rgba(0,0,0,.45);
  transform: translateY(-2px);
}
[data-bs-theme] .challenge-button:hover::before,
[data-bs-theme] .challenge-button:hover::after { opacity: 1; transform: translate(0,0); }
[data-bs-theme] .challenge-inner p {
  font-family: var(--hx-mono); font-size: .95rem; font-weight: 600; color: var(--hx-fg);
  margin: 0 0 .5rem; overflow-wrap: anywhere;
}
[data-bs-theme] .challenge-inner span {
  display: inline-block; font-family: var(--hx-mono); font-size: .78rem; letter-spacing: .06em;
  color: var(--hx-accent); border: 1px solid color-mix(in srgb, var(--hx-accent) 40%, transparent);
  border-radius: 999px; padding: .1rem .6rem; background: rgba(53,255,154,.08);
}
[data-bs-theme] .challenge-inner span::before { content: "◆ "; opacity: .7; }
[data-bs-theme] .challenge-button.challenge-solved {
  background: linear-gradient(180deg, rgba(53,255,154,.16), rgba(53,255,154,.05));
  border-color: var(--hx-accent) !important;
}
[data-bs-theme] .challenge-button.challenge-solved:hover { background: linear-gradient(180deg, rgba(53,255,154,.24), rgba(53,255,154,.08)); }
[data-bs-theme] .challenge-button.challenge-solved .challenge-inner span { color: var(--hx-ink); background: var(--hx-accent); border-color: var(--hx-accent); }
[data-bs-theme] .challenge-button.challenge-solved::before,
[data-bs-theme] .challenge-button.challenge-solved::after { opacity: 1; transform: translate(0,0); }

#challenge-window .modal-body { background: var(--hx-panel); }
.challenge-name { font-family: var(--hx-mono); text-transform: uppercase; letter-spacing: .08em; }
.challenge-value { font-family: var(--hx-mono); color: var(--hx-accent); }
.challenge-desc { color: var(--hx-fg); }
.challenge-desc img { border: 1px solid var(--hx-line-2); border-radius: var(--hx-radius); }
.challenge-tag.badge, .challenge-tags .badge {
  font-family: var(--hx-mono); font-weight: 500; letter-spacing: .04em;
  background: rgba(34,224,255,.12) !important; color: var(--hx-cyan) !important;
  border: 1px solid color-mix(in srgb, var(--hx-cyan) 35%, transparent);
  border-radius: var(--hx-radius);
}
.challenge-attribution, .challenge-ratings { font-size: .78rem; }
.challenge-id { font-family: var(--hx-mono); color: var(--hx-fg-mute); }
.challenge-input { font-family: var(--hx-mono); letter-spacing: .08em; }
.challenge-submit { font-family: var(--hx-mono); }
.challenge-connection-info { font-family: var(--hx-mono); font-size: .82rem; color: var(--hx-fg-dim);
  background: var(--hx-bg-2); border: 1px solid var(--hx-line); border-radius: var(--hx-radius); padding: .6rem .8rem; }
.nav-tabs { border-color: var(--hx-line); }
.nav-tabs .nav-link {
  font-family: var(--hx-mono); font-size: .82rem; color: var(--hx-fg-dim);
  border: 1px solid transparent; border-top-left-radius: var(--hx-radius); border-top-right-radius: var(--hx-radius);
}
.nav-tabs .nav-link:hover { border-color: var(--hx-line) var(--hx-line) transparent; color: var(--hx-fg); }
.nav-tabs .nav-link.active {
  background: var(--hx-raised); color: var(--hx-accent);
  border-color: var(--hx-line) var(--hx-line) var(--hx-panel);
}
.nav-pills .nav-link {
  font-family: var(--hx-mono); font-size: .82rem; color: var(--hx-fg-dim);
  border: 1px solid var(--hx-line); border-radius: var(--hx-radius); margin: 0 .25rem; background: transparent;
}
.nav-pills .nav-link.active { background: var(--hx-accent); color: var(--hx-ink); border-color: var(--hx-accent); font-weight: 600; }
.nav-pills .nav-link:hover:not(.active) { border-color: var(--hx-cyan); color: var(--hx-cyan); }

/* --- 13. Scoreboard ------------------------------------------------------ */
#score-graph {
  background: var(--hx-panel); border: 1px solid var(--hx-line);
  border-radius: var(--hx-radius-lg); margin-bottom: 1.5rem; padding: .5rem;
}
#score-graph canvas { border-radius: var(--hx-radius); }
[data-bs-theme] #scoreboard .table { --bs-table-bg: transparent; border-color: var(--hx-line); }
[data-bs-theme] #scoreboard .table thead th {
  font-family: var(--hx-mono); text-transform: uppercase; letter-spacing: .12em;
  font-size: .72rem; color: var(--hx-fg-mute); border-bottom: 1px solid var(--hx-line-2);
}
[data-bs-theme] #scoreboard .table tbody tr { border-bottom: 1px solid var(--hx-line); transition: background-color .15s ease; }
[data-bs-theme] #scoreboard .table tbody tr:hover { background: rgba(34,224,255,.05); }
[data-bs-theme] #scoreboard .table tbody th {
  font-family: var(--hx-mono); font-size: 1rem; font-weight: 600; color: var(--hx-fg-mute);
  width: 4.5rem;
}
[data-bs-theme] #scoreboard .table tbody td:nth-child(2) { font-weight: 500; }
[data-bs-theme] #scoreboard .table tbody td:last-child {
  font-family: var(--hx-mono); color: var(--hx-accent); font-weight: 600;
}
/* podium */
[data-bs-theme] #scoreboard .table tbody tr:nth-child(1) { background: linear-gradient(90deg, rgba(255,62,165,.14), transparent 70%); }
[data-bs-theme] #scoreboard .table tbody tr:nth-child(2) { background: linear-gradient(90deg, rgba(53,255,154,.12), transparent 70%); }
[data-bs-theme] #scoreboard .table tbody tr:nth-child(3) { background: linear-gradient(90deg, rgba(34,224,255,.12), transparent 70%); }
[data-bs-theme] #scoreboard .table tbody tr:nth-child(1) th { color: var(--hx-magenta); }
[data-bs-theme] #scoreboard .table tbody tr:nth-child(2) th { color: var(--hx-accent); }
[data-bs-theme] #scoreboard .table tbody tr:nth-child(3) th { color: var(--hx-cyan); }
[data-bs-theme] #scoreboard .table tbody tr:nth-child(1) th::before { content: "▲"; font-size: .6rem; margin-right: .2rem; }
[data-bs-theme] #scoreboard .table tbody tr:nth-child(1) th { animation: hx-rise-in .5s ease both; }

/* --- 14. Tables ---------------------------------------------------------- */
[data-bs-theme] .table { --bs-table-color: var(--hx-fg); --bs-table-border-color: var(--hx-line); }
[data-bs-theme] .table thead th { font-family: var(--hx-mono); text-transform: uppercase; letter-spacing: .1em; font-size: .72rem; color: var(--hx-fg-mute); }
.table > tbody > tr > td { padding: .7rem .9rem; }
[data-bs-theme] .table-striped > tbody > tr:nth-of-type(odd) > * { --bs-table-accent-bg: rgba(255,255,255,.02); color: var(--hx-fg); }

/* --- 15. Notifications / alerts / toasts -------------------------------- */
.alert { border-radius: var(--hx-radius); border-width: 1px; font-size: .88rem; }
.alert-info { background: rgba(34,224,255,.10); border-color: color-mix(in srgb, var(--hx-cyan) 40%, transparent); color: var(--hx-fg); }
.alert-danger { background: rgba(255,77,94,.10); border-color: color-mix(in srgb, var(--hx-red) 40%, transparent); color: var(--hx-fg); }
.alert-success { background: rgba(53,255,154,.10); border-color: color-mix(in srgb, var(--hx-accent) 40%, transparent); color: var(--hx-fg); }
.alert-warning { background: rgba(255,176,32,.10); border-color: color-mix(in srgb, var(--hx-amber) 40%, transparent); color: var(--hx-fg); }
.toast { background: var(--hx-panel); border: 1px solid var(--hx-line-2); border-left: 3px solid var(--hx-accent); border-radius: var(--hx-radius); font-family: var(--hx-mono); box-shadow: 0 14px 40px rgba(0,0,0,.55); }
.toast-header { background: var(--hx-bg-2); color: var(--hx-accent); border-color: var(--hx-line); font-family: var(--hx-mono); }
.toast-body { color: var(--hx-fg); font-size: .84rem; }
.ctfdio-email-nudge { font-family: var(--hx-mono); }

/* --- 16. Footer ---------------------------------------------------------- */
.footer.hx-footer {
  /* In normal flow, inside the shell's flex column: main grows, so the footer
     lands on the viewport bottom on short pages. (Core positions it absolute
     against a fixed 60px height, which left a gap under the content here.) */
  position: static; height: auto; line-height: 1.5; z-index: auto;
  flex: 0 0 auto;
  border-top: 1px solid var(--hx-line); margin-top: 3rem;
  background: var(--hx-bg-2);
}
.hx-footer-inner {
  display: flex; flex-wrap: wrap; gap: .5rem 1rem; align-items: center; justify-content: space-between;
  padding: 1rem 0; font-family: var(--hx-mono); font-size: .78rem; color: var(--hx-fg-dim);
}
.hx-footer-line { display: inline-flex; align-items: center; gap: .5rem; }
.hx-prompt { color: var(--hx-accent); }
.hx-footer-meta { display: inline-flex; align-items: center; gap: .4rem; }
.hx-footer-link { color: var(--hx-fg-mute); }
.hx-footer-link:hover { color: var(--hx-cyan); }
.hx-live-dot {
  display: inline-block; width: 7px; height: 7px; border-radius: 50%; background: var(--hx-accent);
  box-shadow: 0 0 8px var(--hx-accent); animation: hx-pulse 2.4s ease-in-out infinite; vertical-align: middle;
}

/* --- 17. Auth pages ------------------------------------------------------ */
.hx-auth { padding-top: 3rem; }
.hx-auth-grid { display: grid; grid-template-columns: 1fr; gap: 2rem; align-items: center; }
@media (min-width: 992px) { .hx-auth-grid { grid-template-columns: 1fr 1fr; gap: 3.5rem; } }
.hx-auth-aside h1 { font-size: clamp(2rem, 5vw, 3.2rem); text-transform: uppercase; letter-spacing: .08em; margin: 0 0 .6rem; }
.hx-auth-panel { padding: 1.5rem 1.6rem 1.8rem; }
.hx-auth-panel .hx-panel-head { margin: -1.5rem -1.6rem 1.4rem; }
.hx-auth-alt { margin: 1.2rem 0 0; font-size: .86rem; color: var(--hx-fg-dim); }

/* --- 18. Error pages ---------------------------------------------------- */
.hx-err { padding-top: 4rem; }
.hx-err-panel {
  max-width: 640px; margin: 0 auto; text-align: center;
  background: linear-gradient(180deg, var(--hx-panel), var(--hx-bg-2));
  border: 1px solid var(--hx-line-2); border-radius: var(--hx-radius-lg);
  padding: 2.5rem 2rem; position: relative; overflow: hidden;
}
.hx-err-code {
  font-family: var(--hx-mono); font-size: clamp(3.5rem, 12vw, 6rem); font-weight: 700;
  line-height: 1; letter-spacing: .06em; color: var(--hx-accent);
  text-shadow: 0 0 24px rgba(53,255,154,.35);
}
.hx-err-title { font-size: 1.35rem; margin: 1rem 0 .3rem; color: var(--hx-fg); }
.hx-err-sub { font-size: .95rem; color: var(--hx-fg-dim); font-family: var(--hx-mono); font-weight: 400; }
.hx-err-actions { display: flex; gap: .75rem; justify-content: center; flex-wrap: wrap; margin: 1.6rem 0 0; }
.hx-err-log {
  text-align: left; margin: 1.8rem 0 0; padding: .8rem 1rem; font-size: .76rem;
  color: var(--hx-fg-mute); background: var(--hx-bg); border: 1px solid var(--hx-line);
  border-radius: var(--hx-radius); white-space: pre-wrap;
}

/* --- 19. Landing page (hx-* markup authored in the index Page) ----------
   Deliberately spare: mark -> title -> countdown -> actions. The countdown is
   the focal element, so the title stays modest and nothing else competes. */
.hx-hero { padding: 3rem 0 1rem; text-align: center; position: relative; }
/* Lockup: mark to the LEFT of the title, as a centred flex row so the two share
   one vertical centre. (Left as inline boxes, the 64px mark sat on the text
   baseline and its centre landed ~17px above the text's.) */
.hx-hero-lockup {
  display: flex; align-items: center; justify-content: center;
  gap: .55rem; margin-bottom: 2rem;
}
.hx-hero-mark { display: flex; color: var(--hx-accent); }
.hx-hero-mark img, .hx-hero-mark svg { width: 64px; height: 64px; filter: drop-shadow(0 0 16px rgba(53,255,154,.32)); }
.hx-hero-title {
  font-family: var(--hx-mono); font-weight: 700; text-transform: uppercase;
  font-size: clamp(1.5rem, 4.2vw, 2.6rem); letter-spacing: .08em; margin: 0; color: var(--hx-fg);
}
.hx-hero-cta { display: flex; gap: .7rem; justify-content: center; flex-wrap: wrap; }

/* Countdown to event start (populated by theme.js from window.init.start) */
.hx-countdown { margin: 0 auto 2.3rem; max-width: 760px; }
.hx-countdown[hidden], .hx-cd-note[hidden] { display: none !important; }
.hx-cd-caption {
  font-family: var(--hx-mono); font-size: .68rem; letter-spacing: .3em;
  text-transform: uppercase; color: var(--hx-fg-mute); margin: 0 0 .9rem;
}
.hx-cd-grid { display: flex; align-items: flex-start; justify-content: center; gap: .35rem; }
.hx-cd-unit { display: flex; flex-direction: column; align-items: center; min-width: 4.6rem; }
.hx-cd-num {
  font-family: var(--hx-mono); font-weight: 700;
  font-size: clamp(2.3rem, 7vw, 4.2rem); line-height: 1;
  color: var(--hx-accent); font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
  text-shadow: 0 0 24px color-mix(in srgb, var(--hx-accent) 32%, transparent);
}
.hx-cd-label {
  font-family: var(--hx-mono); font-size: .62rem; letter-spacing: .22em;
  text-transform: uppercase; color: var(--hx-fg-mute); margin-top: .5rem;
}
.hx-cd-sep {
  font-family: var(--hx-mono); font-weight: 600;
  font-size: clamp(1.8rem, 5.4vw, 3.2rem); line-height: 1.24; color: var(--hx-line-2);
}
.hx-cd-note {
  font-family: var(--hx-mono); font-size: .8rem; color: var(--hx-fg-dim);
  margin: 1rem 0 0;
}
.hx-countdown[data-live] .hx-cd-caption,
.hx-countdown[data-live] .hx-cd-num { color: var(--hx-magenta); }
.hx-countdown[data-live] .hx-cd-num {
  text-shadow: 0 0 24px color-mix(in srgb, var(--hx-magenta) 32%, transparent);
}

/* --- 20. Utilities & motion --------------------------------------------- */
.hx-live-dot, .hx-caret { will-change: opacity; }

@keyframes hx-blink { 0%, 49% { opacity: 1; } 50%, 100% { opacity: 0; } }
@keyframes hx-pulse { 0%, 100% { opacity: 1; box-shadow: 0 0 8px var(--hx-accent); } 50% { opacity: .45; box-shadow: 0 0 3px var(--hx-accent); } }
@keyframes hx-sweep { 0% { left: -60%; opacity: .9; } 100% { left: 130%; opacity: 0; } }
@keyframes hx-flicker { 0%, 100% { opacity: .35; } 47% { opacity: .35; } 48% { opacity: .22; } 49% { opacity: .35; } 72% { opacity: .28; } }
@keyframes hx-rise-in { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
@keyframes hx-glitch-a {
  0%, 92%, 100% { clip-path: inset(0 0 100% 0); transform: translate(-2px,0); }
  93% { clip-path: inset(12% 0 62% 0); transform: translate(-3px,-1px); }
  95% { clip-path: inset(48% 0 28% 0); transform: translate(3px,1px); }
  97% { clip-path: inset(70% 0 8% 0); transform: translate(-2px,1px); }
}
@keyframes hx-glitch-b {
  0%, 90%, 100% { clip-path: inset(0 0 100% 0); transform: translate(2px,0); }
  91% { clip-path: inset(30% 0 44% 0); transform: translate(2px,1px); }
  94% { clip-path: inset(62% 0 16% 0); transform: translate(-3px,-1px); }
  98% { clip-path: inset(8% 0 74% 0); transform: translate(2px,-1px); }
}

/* --- 21. Responsive ------------------------------------------------------ */
@media (max-width: 767.98px) {
  body.hx-body { font-size: 14.5px; }
  #base-navbars { background: var(--hx-panel); border: 1px solid var(--hx-line); border-radius: var(--hx-radius); padding: .5rem; margin-top: .5rem; }
  .hx-nav-link::after { display: none; }
  [data-bs-theme] .challenge-button { min-height: 92px; }
  .hx-err-panel { padding: 1.8rem 1.2rem; }
  .hx-actions, .hx-hero-cta { flex-direction: column; }
  .hx-hero-cta .btn { width: 100%; }
  .hx-auth { padding-top: 1.5rem; }
  #score-graph { min-height: 300px; }
}

/* --- 22. Reduced motion & print ----------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
  .hx-rain { display: none; }
  .hx-scanlines { animation: none; opacity: .2; }
  .hx-glitch::before, .hx-glitch::after { display: none; }
  .hx-caret { animation: none; opacity: 1; }
  .hx-live-dot { animation: none; }
}
@media print {
  .hx-rain, .hx-grid, .hx-scanlines, .hx-aurora, .hx-nav, .footer { display: none !important; }
  body.hx-body { background: #fff; color: #000; }
}