/* ==========================================================================
   Exam & CTF Portal — Dark Theme
   ========================================================================== */

/* --- Custom Properties --- */
:root {
  --bg:        #0B0F14;
  --surface:   #111A22;
  --surface-2: #16222E;
  --border:    #1E2A36;
  --text:      #E6EDF3;
  --muted:     #8B98A5;
  --accent:    #D7263D;
  --accent-2:  #38BDF8;
  --solved:    #22C55E;
  --warn:      #F59E0B;
  --hover-overlay: rgba(255, 255, 255, 0.02);

  --font-body: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --radius: 12px;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

/* --- Light theme override --- */
[data-theme="light"] {
  --bg:        #F5F7FA;
  --surface:   #FFFFFF;
  --surface-2: #EEF2F6;
  --border:    #DDE3EA;
  --text:      #1A2430;
  --muted:     #5B6572;
  --accent:    #D7263D;
  --accent-2:  #0369A1;
  --solved:    #15803D;
  --warn:      #B45309;
  --hover-overlay: rgba(0, 0, 0, 0.035);
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

/* --- Reset & Base --- */
*,
*::before,
*::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; }

body {
  font-family: var(--font-body);
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;

  /* Subtle dotted grid */
  background-image: radial-gradient(circle, var(--border) 1px, transparent 1px);
  background-size: 24px 24px;
}

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

/* --- Typography --- */
h1, h2, h3, h4 { line-height: 1.3; }
h2 { font-size: 1.5rem; margin-bottom: 1rem; }
h3 { font-size: 1.2rem; margin-bottom: 0.75rem; }
h4 { font-size: 1rem; margin-bottom: 0.5rem; color: var(--muted); }

.muted { color: var(--muted); font-size: 0.875rem; }

/* --- Layout --- */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 1rem 1.5rem;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.header-brand { flex: 1; min-width: 0; }

/* Logged-out pages (login/register): brand spans full width, centred */
.header-inner-guest { justify-content: center; }
.header-inner-guest .header-brand { text-align: center; }

.portal-title {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  border-bottom: 2px solid var(--accent);
  display: inline-block;
  padding-bottom: 0.125rem;
}

.portal-subtitle {
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 0.25rem;
}

.header-logo {
  height: 40px;
  width: auto;
  display: block;
  margin-bottom: 0.375rem;
}

/* Auth pages: logo centered above the card */
.auth-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  max-width: 420px;
}

.auth-logo {
  max-width: 220px;
  max-height: 120px;
  margin-bottom: 1.25rem;
}

/* Swap to the light-mode logo variant when one is available */
.theme-logo-light { display: none; }
[data-theme="light"] .theme-logo-dark { display: none; }
[data-theme="light"] .theme-logo-light { display: block; }

.current-logo { margin-bottom: 0.5rem; }
.current-logo-img {
  max-width: 160px;
  max-height: 80px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.5rem;
}

/* Admin scoreboard controls */
.scoreboard-controls {
  padding: 1rem 1.25rem;
  margin-bottom: 1rem;
  display: flex;
  align-items: flex-end;
  gap: 1rem;
}
.scoreboard-controls .form-group { margin-bottom: 0; }

.sort-link {
  color: var(--accent-2);
  text-decoration: none;
  margin-left: 0.375rem;
}
.sort-link:hover { color: var(--text); }

.header-nav {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.nav-user { font-weight: 600; }

.score-chip {
  background: var(--surface-2);
  color: var(--accent-2);
  padding: 0.2rem 0.6rem;
  border-radius: 20px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  border: 1px solid var(--border);
}

.nav-link {
  color: var(--muted);
  font-size: 0.875rem;
  transition: color 0.15s;
}
.nav-link:hover { color: var(--text); text-decoration: none; }

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 50%;
  color: var(--text);
  font-size: 0.95rem;
  line-height: 1;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}
.theme-toggle:hover { background: var(--hover-overlay); border-color: var(--accent-2); }

.btn-link {
  background: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.875rem;
  padding: 0;
}

.nav-form { display: inline; }

.site-main {
  flex: 1;
  max-width: 1100px;
  width: 100%;
  margin: 2rem auto;
  padding: 0 1.5rem;
}

.site-footer {
  text-align: center;
  padding: 1.5rem;
  color: var(--muted);
  font-size: 0.8rem;
  border-top: 1px solid var(--border);
  margin-top: auto;
}

/* --- Flash Messages --- */
.flash-container {
  margin-bottom: 1.5rem;
}

.flash {
  padding: 0.75rem 1rem;
  border-radius: 8px;
  margin-bottom: 0.5rem;
  border-left: 4px solid;
  font-size: 0.9rem;
}

.flash-success { background: rgba(34, 197, 94, 0.1); border-color: var(--solved); color: var(--solved); }
.flash-error   { background: rgba(215, 38, 61, 0.1);  border-color: var(--accent); color: var(--accent); }
.flash-info    { background: rgba(56, 189, 248, 0.1);  border-color: var(--accent-2); color: var(--accent-2); }
.flash-warning { background: rgba(245, 158, 11, 0.1);  border-color: var(--warn); color: var(--warn); }

/* --- Cards --- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

/* Danger zone (destructive admin actions) */
.danger-zone {
  margin-top: 1.5rem;
  padding: 1.25rem;
  border-color: var(--accent);
}
.danger-zone h3 { color: var(--accent); margin-top: 0; }
.danger-zone p { margin-bottom: 1rem; }

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.55rem 1.1rem;
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  border: 1px solid transparent;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, opacity 0.15s;
  text-decoration: none;
  white-space: nowrap;
}
.btn:hover { text-decoration: none; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover { background: #c02035; }

.btn-secondary {
  background: transparent;
  border-color: var(--border);
  color: var(--text);
}
.btn-secondary:hover { background: var(--surface-2); }

.btn-danger {
  background: transparent;
  border-color: var(--accent);
  color: var(--accent);
}
.btn-danger:hover { background: rgba(215, 38, 61, 0.15); }

.btn-sm {
  padding: 0.3rem 0.7rem;
  font-size: 0.8rem;
}

.btn-full { width: 100%; justify-content: center; }

/* --- Forms --- */
.form-group { margin-bottom: 1rem; }
.form-group label { display: block; margin-bottom: 0.35rem; font-size: 0.875rem; font-weight: 500; color: var(--muted); }

.form-input {
  width: 100%;
  padding: 0.6rem 0.75rem;
  font-family: inherit;
  font-size: 0.9rem;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  transition: border-color 0.15s;
}

.form-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(215, 38, 61, 0.2);
}

.form-input-sm {
  padding: 0.3rem 0.5rem;
  font-size: 0.8rem;
  width: auto;
  min-width: 120px;
}

.form-textarea { resize: vertical; }
.form-select { appearance: none; -webkit-appearance: none; -moz-appearance: none; }

.flag-field {
  font-family: var(--font-mono);
}

.form-checkbox {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.form-checkbox label {
  margin-bottom: 0;
  cursor: pointer;
}
.form-checkbox-input {
  width: 1rem;
  height: 1rem;
  accent-color: var(--accent);
}

.form-error { display: block; color: var(--accent); font-size: 0.8rem; margin-top: 0.25rem; }
.form-hint { display: block; color: var(--muted); font-size: 0.8rem; margin-top: 0.25rem; }

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.form-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

/* --- Auth Pages --- */
.auth-page {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 60vh;
}

.auth-card {
  width: 100%;
  max-width: 420px;
  padding: 2rem;
}

.auth-card h2 { text-align: center; margin-bottom: 1.5rem; }

.auth-alt {
  text-align: center;
  margin-top: 1rem;
  font-size: 0.875rem;
  color: var(--muted);
}

/* --- Dashboard / Challenges --- */
.dashboard-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

/* Accordion */
.accordion { display: flex; flex-direction: column; gap: 0.75rem; }

.challenge-card {
  overflow: hidden;
  transition: border-color 0.2s, background 0.2s;
}

.challenge-card.solved {
  border-left: 3px solid var(--solved);
  background: rgba(34, 197, 94, 0.04);
}

.accordion-trigger {
  width: 100%;
  background: none;
  border: none;
  cursor: pointer;
  padding: 1rem 1.25rem;
  color: var(--text);
  font-family: inherit;
  font-size: 1rem;
  text-align: left;
  display: flex;
  align-items: center;
}

.accordion-trigger:hover { background: var(--hover-overlay); }
.accordion-trigger:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }

.challenge-summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.challenge-title { font-weight: 600; flex: 1; min-width: 0; }

.challenge-meta { display: flex; gap: 0.5rem; align-items: center; flex-shrink: 0; }

/* Accordion panel: visible by default (no-JS fallback); JS collapses them */
.js .accordion-panel { display: none; }

/* Only show panel when trigger is expanded */
.js .accordion-trigger[aria-expanded="true"] + .accordion-panel { display: block; }

.panel-content {
  padding: 0 1.25rem 1.25rem;
}

.challenge-description {
  white-space: pre-wrap;
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

.starting-points {
  background: var(--surface-2);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  margin-bottom: 1rem;
}

.starting-points pre {
  font-family: var(--font-mono);
  font-size: 0.825rem;
  white-space: pre-wrap;
  margin: 0;
}

.flag-input-row {
  display: flex;
  gap: 0.5rem;
}

.flag-input { flex: 1; font-family: var(--font-mono); }

.flag-feedback {
  display: inline-block;
  margin-top: 0.5rem;
  font-size: 0.85rem;
  font-weight: 600;
  min-height: 1.2em;
}

.flag-feedback.correct { color: var(--solved); }
.flag-feedback.incorrect { color: var(--warn); }
.flag-feedback.already-solved { color: var(--accent-2); }

/* Shake animation */
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-6px); }
  40% { transform: translateX(6px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(4px); }
}

.shake { animation: shake 0.4s ease-in-out; }

@media (prefers-reduced-motion: reduce) {
  .shake { animation: none; }
  * { transition-duration: 0s !important; }
}

/* --- Badges --- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.15rem 0.5rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  white-space: nowrap;
}

.badge-category {
  background: transparent;
  border: 1px solid var(--accent-2);
  color: var(--accent-2);
}

.badge-points {
  background: var(--surface-2);
  color: var(--muted);
  font-family: var(--font-mono);
}

.badge-solved {
  background: var(--solved);
  color: #fff;
  display: none;
}

.badge-solved.visible { display: inline-flex; }

.badge-incorrect {
  background: rgba(245, 158, 11, 0.2);
  color: var(--warn);
}

.badge-role {
  background: var(--surface-2);
  color: var(--accent-2);
  text-transform: uppercase;
  font-size: 0.7rem;
}

/* --- Tables --- */
.table-scroll { overflow-x: auto; }

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.table th {
  text-align: left;
  padding: 0.6rem 0.75rem;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
}

.table td {
  padding: 0.6rem 0.75rem;
  border-bottom: 1px solid var(--border);
}

.table tbody tr:hover { background: var(--hover-overlay); }

.actions {
  display: flex;
  gap: 0.375rem;
  align-items: center;
  flex-wrap: wrap;
}

.inline-form { display: inline-flex; gap: 0.375rem; }
.inline-form-password { align-items: center; }

/* --- Admin --- */
.admin-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.stat-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.stat-card {
  padding: 1.5rem;
  text-align: center;
}

.stat-number {
  display: block;
  font-size: 2rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--accent);
}

.stat-label {
  display: block;
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 0.25rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.admin-links {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.admin-form {
  padding: 1.5rem;
}

/* --- Form pages --- */
.form-page { max-width: 700px; }

/* --- Empty state --- */
.empty-state {
  text-align: center;
  padding: 3rem;
  color: var(--muted);
}

/* --- Scoreboard --- */
.scoreboard-page { max-width: 600px; }

/* --- Responsive --- */
@media (max-width: 640px) {
  .header-inner { flex-direction: column; align-items: flex-start; }
  .header-nav { width: 100%; justify-content: flex-start; }
  .form-row { grid-template-columns: 1fr; }
  .challenge-summary { flex-direction: column; align-items: flex-start; }
  .flag-input-row { flex-direction: column; }
  .site-main { padding: 0 1rem; margin: 1rem auto; }
}