/* MaturaHeld – Professional UI */
:root {
  --bg: #0f0f13;
  --bg-card: #1a1a24;
  --bg-card-hover: #22223a;
  --bg-input: #14141e;
  --text: #e8e8f0;
  --text-muted: #8888a0;
  --text-dim: #555568;
  --accent: #6366f1;
  --accent-light: #818cf8;
  --accent-glow: rgba(99, 102, 241, 0.15);
  --success: #22c55e;
  --success-bg: rgba(34, 197, 94, 0.1);
  --danger: #ef4444;
  --danger-bg: rgba(239, 68, 68, 0.1);
  --warning: #f59e0b;
  --border: #2a2a3e;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0,0,0,0.3);
  --math-color: #6366f1;
  --deutsch-color: #ef4444;
  --englisch-color: #22c55e;
  --transition: 0.2s ease;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: 'Inter', -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

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

/* === NAV === */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(15, 15, 19, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
}
.nav-inner {
  max-width: 1200px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.nav-logo {
  font-size: 1.3rem; font-weight: 800;
  background: linear-gradient(135deg, var(--accent), #a78bfa);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  cursor: pointer;
}
.nav-logo span { font-size: 1.5rem; margin-right: 6px; -webkit-text-fill-color: initial; }
.nav-links { display: flex; gap: 8px; align-items: center; }
.nav-links button, .nav-link {
  background: none; border: none; color: var(--text-muted);
  font: inherit; font-size: 0.9rem; font-weight: 500;
  padding: 8px 14px; border-radius: var(--radius-sm);
  cursor: pointer; transition: var(--transition);
}
.nav-links button:hover, .nav-link:hover { color: var(--text); background: var(--bg-card); }
.nav-user { font-size: 0.85rem; color: var(--accent-light); font-weight: 600; }

/* === LAYOUT === */
.container { max-width: 1200px; margin: 0 auto; padding: 32px 24px; }

/* === AUTH === */
.auth-page {
  min-height: calc(100vh - 64px);
  display: flex; align-items: center; justify-content: center;
  padding: 24px;
}
.auth-box {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 20px; padding: 48px; width: 100%; max-width: 420px;
  box-shadow: var(--shadow);
}
.auth-box h2 {
  font-size: 1.6rem; font-weight: 800; margin-bottom: 8px;
  text-align: center;
}
.auth-box .subtitle { color: var(--text-muted); text-align: center; margin-bottom: 32px; font-size: 0.95rem; }
.auth-hero { font-size: 3rem; text-align: center; margin-bottom: 16px; }

.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 0.85rem; font-weight: 600; color: var(--text-muted); margin-bottom: 6px; }
.form-group input {
  width: 100%; padding: 12px 16px; border: 1px solid var(--border);
  background: var(--bg-input); color: var(--text); border-radius: var(--radius-sm);
  font: inherit; font-size: 0.95rem; outline: none; transition: var(--transition);
}
.form-group input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-glow); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 24px; border: none; border-radius: var(--radius-sm);
  font: inherit; font-size: 0.95rem; font-weight: 600;
  cursor: pointer; transition: var(--transition);
}
.btn-primary {
  background: var(--accent); color: white; width: 100%;
}
.btn-primary:hover { background: var(--accent-light); transform: translateY(-1px); }
.btn-secondary { background: var(--bg-card); color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { background: var(--bg-card-hover); }
.btn-sm { padding: 8px 16px; font-size: 0.85rem; }
.btn-success { background: var(--success); color: white; }
.btn-danger { background: var(--danger); color: white; }
.btn-ghost { background: none; color: var(--text-muted); padding: 8px 12px; }
.btn-ghost:hover { color: var(--text); }

.auth-toggle { text-align: center; margin-top: 20px; color: var(--text-muted); font-size: 0.9rem; }
.auth-toggle a { cursor: pointer; color: var(--accent-light); font-weight: 600; }

.error-msg { background: var(--danger-bg); color: var(--danger); padding: 10px 16px; border-radius: var(--radius-sm); margin-bottom: 16px; font-size: 0.9rem; }

/* === DASHBOARD === */
.dashboard-header {
  margin-bottom: 40px;
}
.dashboard-header h1 { font-size: 2rem; font-weight: 800; margin-bottom: 8px; }
.dashboard-header p { color: var(--text-muted); font-size: 1.05rem; }

.stats-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px; margin-bottom: 40px;
}
.stat-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px;
  transition: var(--transition);
}
.stat-card:hover { border-color: var(--accent); }
.stat-value { font-size: 2rem; font-weight: 800; }
.stat-label { color: var(--text-muted); font-size: 0.85rem; margin-top: 4px; }

/* === SUBJECT CARDS === */
.subjects-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 20px; margin-bottom: 40px;
}
.subject-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 28px;
  cursor: pointer; transition: all 0.3s ease;
  position: relative; overflow: hidden;
}
.subject-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--card-color, var(--accent));
}
.subject-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.4);
  border-color: var(--card-color, var(--accent));
}
.subject-icon { font-size: 2.5rem; margin-bottom: 16px; }
.subject-name { font-size: 1.3rem; font-weight: 700; margin-bottom: 8px; }
.subject-desc { color: var(--text-muted); font-size: 0.9rem; margin-bottom: 20px; line-height: 1.5; }
.subject-meta { display: flex; gap: 16px; }
.meta-item { font-size: 0.8rem; color: var(--text-dim); }
.meta-item strong { color: var(--text-muted); }

.progress-bar-bg {
  width: 100%; height: 6px; background: var(--bg); border-radius: 3px;
  margin-top: 16px; overflow: hidden;
}
.progress-bar-fill {
  height: 100%; border-radius: 3px; transition: width 0.5s ease;
  background: var(--card-color, var(--accent));
}

/* === SUBJECT VIEW === */
.subject-header {
  display: flex; align-items: center; gap: 16px; margin-bottom: 32px;
}
.subject-header .back-btn {
  background: var(--bg-card); border: 1px solid var(--border);
  width: 40px; height: 40px; border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; transition: var(--transition); color: var(--text); font-size: 1.2rem;
}
.subject-header .back-btn:hover { border-color: var(--accent); }
.subject-header h1 { font-size: 1.8rem; }

.topic-section { margin-bottom: 36px; }
.topic-title {
  font-size: 1.1rem; font-weight: 700; margin-bottom: 16px;
  padding-bottom: 8px; border-bottom: 1px solid var(--border);
  color: var(--text-muted);
}

.task-list { display: flex; flex-direction: column; gap: 12px; }
.task-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px 24px;
  cursor: pointer; transition: var(--transition);
  display: flex; align-items: center; gap: 16px;
}
.task-card:hover { border-color: var(--accent); background: var(--bg-card-hover); }
.task-status {
  width: 36px; height: 36px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.85rem; flex-shrink: 0;
  background: var(--bg); border: 2px solid var(--border);
}
.task-status.completed { background: var(--success-bg); border-color: var(--success); color: var(--success); }
.task-status.wrong { background: var(--danger-bg); border-color: var(--danger); color: var(--danger); }
.task-info { flex: 1; }
.task-title { font-weight: 600; margin-bottom: 4px; }
.task-meta { font-size: 0.8rem; color: var(--text-dim); display: flex; gap: 12px; flex-wrap: wrap; }
.difficulty { display: inline-flex; gap: 2px; }
.difficulty .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--border); }
.difficulty .dot.active { background: var(--warning); }

/* === TASK VIEW === */
.task-view { max-width: 800px; margin: 0 auto; }
.task-view h1 { font-size: 1.5rem; font-weight: 700; margin-bottom: 8px; }
.task-breadcrumb { color: var(--text-dim); font-size: 0.85rem; margin-bottom: 24px; }
.task-body {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px; margin-bottom: 24px;
}
.task-description {
  font-size: 1rem; line-height: 1.8; white-space: pre-wrap;
  margin-bottom: 28px;
}
.task-description strong { color: var(--accent-light); }

/* MC Options */
.mc-options { display: flex; flex-direction: column; gap: 10px; margin-bottom: 20px; }
.mc-option {
  background: var(--bg); border: 2px solid var(--border); border-radius: var(--radius-sm);
  padding: 14px 18px; cursor: pointer; transition: var(--transition);
  display: flex; align-items: center; gap: 12px;
}
.mc-option:hover { border-color: var(--accent); }
.mc-option.selected { border-color: var(--accent); background: var(--accent-glow); }
.mc-option.correct { border-color: var(--success); background: var(--success-bg); }
.mc-option.wrong { border-color: var(--danger); background: var(--danger-bg); }
.mc-letter {
  width: 28px; height: 28px; border-radius: 50%; border: 2px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.8rem; font-weight: 700; flex-shrink: 0;
}
.mc-option.selected .mc-letter { border-color: var(--accent); background: var(--accent); color: white; }

.open-answer {
  width: 100%; min-height: 120px; padding: 16px;
  background: var(--bg); border: 1px solid var(--border);
  border-radius: var(--radius-sm); color: var(--text);
  font: inherit; font-size: 0.95rem; resize: vertical; outline: none;
}
.open-answer:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-glow); }

.task-actions { display: flex; gap: 12px; margin-top: 20px; flex-wrap: wrap; }

/* Solution */
.solution-box {
  background: var(--bg-card); border: 1px solid var(--success);
  border-radius: var(--radius); padding: 28px; margin-top: 24px;
}
.solution-box h3 { color: var(--success); margin-bottom: 16px; font-size: 1.1rem; }
.solution-box .solution-text { line-height: 1.8; white-space: pre-wrap; }

/* === EXAM === */
.exam-header {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px; margin-bottom: 24px;
  display: flex; justify-content: space-between; align-items: center;
  position: sticky; top: 64px; z-index: 50;
  backdrop-filter: blur(20px);
}
.timer { font-size: 1.5rem; font-weight: 800; font-variant-numeric: tabular-nums; }
.timer.warning { color: var(--warning); }
.timer.danger { color: var(--danger); animation: pulse 1s infinite; }
@keyframes pulse { 50% { opacity: 0.6; } }
.exam-progress-text { color: var(--text-muted); font-size: 0.9rem; }

.exam-task {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px; margin-bottom: 20px;
}
.exam-task-num { color: var(--accent-light); font-size: 0.85rem; font-weight: 700; margin-bottom: 8px; }

/* Results */
.results-header { text-align: center; margin-bottom: 40px; }
.results-score {
  font-size: 4rem; font-weight: 800;
  background: linear-gradient(135deg, var(--accent), #a78bfa);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.results-grade { font-size: 1.2rem; color: var(--text-muted); margin-top: 8px; }

.result-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px; margin-bottom: 12px;
}
.result-card.correct { border-left: 4px solid var(--success); }
.result-card.wrong { border-left: 4px solid var(--danger); }
.result-card.review { border-left: 4px solid var(--warning); }

/* === RESPONSIVE === */
@media (max-width: 768px) {
  .container { padding: 20px 16px; }
  .subjects-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .auth-box { padding: 32px 24px; }
  .dashboard-header h1 { font-size: 1.5rem; }
  .nav-inner { padding: 0; }
  .nav-links button, .nav-link { padding: 8px 10px; font-size: 0.8rem; }
  .exam-header { flex-direction: column; gap: 12px; text-align: center; }
  .task-body { padding: 20px; }
}
@media (max-width: 400px) {
  .stats-grid { grid-template-columns: 1fr; }
  .subject-meta { flex-direction: column; gap: 4px; }
}

/* === MISC === */
.section-title { font-size: 1.3rem; font-weight: 700; margin-bottom: 20px; }
.empty-state {
  text-align: center; padding: 60px 20px; color: var(--text-muted);
}
.empty-state .icon { font-size: 3rem; margin-bottom: 16px; }
.tag {
  display: inline-block; padding: 4px 10px; border-radius: 20px;
  font-size: 0.75rem; font-weight: 600;
  background: var(--accent-glow); color: var(--accent-light);
}
.tag-year { background: rgba(245, 158, 11, 0.1); color: var(--warning); }

/* Exam start modal */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.7);
  display: flex; align-items: center; justify-content: center;
  z-index: 200; padding: 24px;
}
.modal {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 20px; padding: 36px; max-width: 480px; width: 100%;
  box-shadow: 0 24px 80px rgba(0,0,0,0.5);
}
.modal h2 { margin-bottom: 16px; }
.modal p { color: var(--text-muted); margin-bottom: 24px; line-height: 1.6; }

.exam-config { display: flex; flex-direction: column; gap: 16px; margin-bottom: 24px; }
.config-row { display: flex; justify-content: space-between; align-items: center; }
.config-row label { font-size: 0.9rem; font-weight: 600; }
.config-row select, .config-row input[type="number"] {
  padding: 8px 12px; background: var(--bg); border: 1px solid var(--border);
  border-radius: var(--radius-sm); color: var(--text); font: inherit;
}

/* Recent Activity */
.activity-list { display: flex; flex-direction: column; gap: 8px; }
.activity-item {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 16px; background: var(--bg-card);
  border-radius: var(--radius-sm); font-size: 0.9rem;
}
.activity-icon { font-size: 1.2rem; }
.activity-time { color: var(--text-dim); font-size: 0.8rem; margin-left: auto; }