/* MPU Vorbereitungs-Lernplattform — Premium Dark Theme mit Glassmorphism */
:root {
    --bg: #0a0e14;
    --bg-light: #131822;
    --bg-card: rgba(19, 24, 34, 0.6);
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-blur: 20px;
    --accent: #67c1b8;
    --accent-dim: rgba(103, 193, 184, 0.15);
    --text: #e8eef2;
    --text-dim: #8a9baa;
    --text-muted: #5a6b7a;
    --danger: #e74c3c;
    --success: #2ecc71;
    --warning: #f39c12;
    --radius: 16px;
    --radius-sm: 8px;
    --transition: all 0.3s ease;
    --shadow: 0 4px 24px rgba(0,0,0,0.3);
}

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

body {
    font-family: 'Inter', -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    background-image: 
        radial-gradient(ellipse at top left, rgba(103,193,184,0.08), transparent 50%),
        radial-gradient(ellipse at bottom right, rgba(103,193,184,0.05), transparent 50%);
    background-attachment: fixed;
}

/* NAVBAR */
.navbar {
    background: rgba(10,14,20,0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
    padding: 0 24px;
    height: 60px;
    display: flex;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text);
    font-weight: 700;
    font-size: 1.1rem;
}

.logo-icon { font-size: 1.5rem; }

.nav-right { display: flex; align-items: center; gap: 16px; }

.nav-user { color: var(--text-dim); font-size: 0.9rem; }

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

/* GLASS */
.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

/* BUTTONS */
.btn-primary, .btn-ghost {
    border: none;
    padding: 10px 24px;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.btn-primary {
    background: var(--accent);
    color: #0a0e14;
    font-weight: 600;
}
.btn-primary:hover { opacity: 0.9; transform: translateY(-1px); }

.btn-ghost {
    background: transparent;
    color: var(--text);
    border: 1px solid var(--glass-border);
}
.btn-ghost:hover { background: var(--glass-bg); border-color: var(--accent); }

.btn-large { padding: 14px 32px; font-size: 1.05rem; }
.btn-full { width: 100%; }

/* HERO */
.hero { margin-bottom: 40px; }

.hero-content {
    padding: 48px 40px;
    text-align: center;
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 12px;
    background: linear-gradient(135deg, var(--accent), #a0d8d0);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle { color: var(--text-dim); font-size: 1.15rem; max-width: 600px; margin: 0 auto 24px; }
.hero-welcome { color: var(--accent); font-size: 1.05rem; margin-top: 8px; }

/* TRACK CARDS */
.tracks-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
    margin-bottom: 48px;
}

.track-card {
    padding: 32px;
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid var(--glass-border);
}

.track-card:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.4), 0 0 0 1px var(--accent);
}

.track-card-icon {
    width: 64px; height: 64px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin-bottom: 16px;
}

.track-card-title { font-size: 1.4rem; font-weight: 700; margin-bottom: 4px; }
.track-card-subtitle { color: var(--accent); font-size: 0.9rem; margin-bottom: 12px; }
.track-card-desc { color: var(--text-dim); font-size: 0.9rem; margin-bottom: 16px; line-height: 1.5; }
.track-card-link { font-weight: 600; font-size: 0.95rem; }

/* FEATURES */
.features-section, .recommendations-section, .dashboard-section {
    margin-bottom: 40px;
}

.section-title {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
}

.feature-card {
    padding: 24px;
    text-align: center;
}

.feature-icon { font-size: 2.5rem; margin-bottom: 12px; }
.feature-card h3 { font-size: 1.1rem; margin-bottom: 8px; }
.feature-card p { color: var(--text-dim); font-size: 0.9rem; }

/* TRACK HEADER */
.track-header {
    padding: 20px 28px;
    margin-bottom: 24px;
}

.back-link {
    color: var(--text-dim);
    text-decoration: none;
    font-size: 0.9rem;
    display: inline-block;
    margin-bottom: 12px;
    transition: var(--transition);
}
.back-link:hover { color: var(--accent); }

.track-header-info { display: flex; align-items: center; gap: 16px; }
.track-header-icon {
    width: 52px; height: 52px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
}
.track-header-title { font-size: 1.5rem; font-weight: 700; }
.track-header-subtitle { color: var(--accent); font-size: 0.9rem; }

/* MODULES GRID */
.modules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
}

.module-card {
    padding: 28px;
    text-decoration: none;
    color: var(--text);
    transition: var(--transition);
    border: 1px solid var(--glass-border);
}

.module-card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}

.module-icon { font-size: 2.2rem; margin-bottom: 12px; }
.module-card h3 { font-size: 1.2rem; margin-bottom: 6px; }
.module-card p { color: var(--text-dim); font-size: 0.9rem; margin-bottom: 12px; }

.module-progress, .module-stats { margin-top: 12px; }

.stat-pill {
    display: inline-block;
    background: rgba(103,193,184,0.1);
    color: var(--accent);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    margin-right: 6px;
    margin-bottom: 4px;
}

/* PROGRESS BAR */
.progress-bar {
    height: 6px;
    background: rgba(255,255,255,0.05);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 6px;
}

.progress-fill {
    height: 100%;
    border-radius: 3px;
    transition: width 0.5s ease;
}

.progress-text { font-size: 0.8rem; color: var(--text-dim); }

/* THEORY */
.theory-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 24px;
}

.theory-sidebar { padding: 20px; }
.theory-sidebar h3 { font-size: 1rem; margin-bottom: 16px; }

.lesson-list { display: flex; flex-direction: column; gap: 4px; }

.lesson-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.9rem;
    border: 1px solid transparent;
}

.lesson-item:hover { background: var(--glass-bg); border-color: var(--glass-border); }
.lesson-item.active { background: var(--accent-dim); border-color: var(--accent); }
.lesson-item.completed .lesson-check { color: var(--success); }

.lesson-icon { font-size: 1.1rem; }
.lesson-title { flex: 1; line-height: 1.3; }
.lesson-check { color: var(--success); font-weight: bold; }

.theory-progress-bar { margin-top: 16px; }

.theory-content { padding: 32px; min-height: 400px; }
.theory-content h1, .theory-content h2 { color: var(--accent); margin-top: 20px; }
.theory-content h1:first-child, .theory-content h2:first-child { margin-top: 0; }
.theory-content h3 { color: var(--text); margin-top: 16px; }
.theory-content p { margin-bottom: 12px; color: var(--text-dim); }
.theory-content ul, .theory-content ol { margin-left: 20px; margin-bottom: 12px; color: var(--text-dim); }
.theory-content li { margin-bottom: 4px; }
.theory-content strong { color: var(--text); }
.theory-content code { background: var(--glass-bg); padding: 2px 6px; border-radius: 4px; }

.lesson-meta { margin-top: 24px; }
.lesson-section { margin-bottom: 20px; padding: 16px; background: var(--glass-bg); border-radius: var(--radius-sm); }
.lesson-section h4 { color: var(--accent); margin-bottom: 8px; }
.lesson-section ul { margin-left: 20px; }
.lesson-section li { color: var(--text-dim); margin-bottom: 6px; }
.lesson-section p { color: var(--text-dim); }

#completeBtn { margin-top: 20px; }

/* QUIZ */
.quiz-container { padding: 32px; }

.quiz-start { text-align: center; padding: 20px; }
.quiz-start h2 { font-size: 1.5rem; margin-bottom: 12px; }
.quiz-start p { color: var(--text-dim); margin-bottom: 8px; }
.quiz-info { color: var(--text-muted); font-size: 0.85rem; margin-bottom: 20px; }

.quiz-history { margin-top: 32px; text-align: left; }
.quiz-history h3 { margin-bottom: 12px; font-size: 1.1rem; }

.quiz-result-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 10px 0;
    border-bottom: 1px solid var(--glass-border);
    font-size: 0.9rem;
}

.quiz-result-item:last-child { border-bottom: none; }
.quiz-result-score { font-weight: 600; color: var(--accent); min-width: 60px; }
.quiz-result-pct { color: var(--text-dim); }
.quiz-result-date { margin-left: auto; color: var(--text-muted); font-size: 0.85rem; }

.quiz-progress { margin-bottom: 24px; }

.quiz-question {
    margin-bottom: 24px;
    padding: 20px;
    background: var(--glass-bg);
    border-radius: var(--radius-sm);
    border: 1px solid var(--glass-border);
}

.quiz-question-text { font-size: 1rem; font-weight: 500; margin-bottom: 12px; }
.quiz-option {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid var(--glass-border);
    margin-bottom: 8px;
}

.quiz-option:hover { background: var(--accent-dim); border-color: var(--accent); }
.quiz-option.selected { background: var(--accent-dim); border-color: var(--accent); }
.quiz-option input { accent-color: var(--accent); }

.quiz-results h2 { text-align: center; margin-bottom: 20px; }

.quiz-results-summary {
    padding: 24px;
    text-align: center;
    margin-bottom: 24px;
}

.quiz-results-summary h3 { font-size: 2rem; color: var(--accent); margin-bottom: 8px; }
.quiz-results-summary p { color: var(--text-dim); }

.quiz-answer-detail {
    padding: 16px;
    margin-bottom: 12px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--glass-border);
}

.quiz-answer-detail.correct { border-left: 3px solid var(--success); }
.quiz-answer-detail.incorrect { border-left: 3px solid var(--danger); }

.quiz-answer-detail .q-text { font-weight: 500; margin-bottom: 8px; }
.quiz-answer-detail .q-answers { font-size: 0.9rem; color: var(--text-dim); margin-bottom: 6px; }
.quiz-answer-detail .q-explanation { font-size: 0.85rem; color: var(--text-muted); font-style: italic; }

/* GESPRÄCH */
.gespraech-layout {
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: 24px;
}

.gespraech-main { padding: 28px; min-height: 500px; }

.gespraech-intro { text-align: center; padding: 20px; }
.gespraech-intro h2 { font-size: 1.5rem; margin-bottom: 12px; }
.gespraech-intro > p { color: var(--text-dim); margin-bottom: 20px; }

.gespraech-info {
    padding: 20px;
    margin-bottom: 24px;
    text-align: left;
}

.gespraech-info h4 { color: var(--accent); margin-bottom: 8px; }
.gespraech-info ul { margin-left: 20px; }
.gespraech-info li { color: var(--text-dim); margin-bottom: 6px; }

.chat-messages {
    max-height: 450px;
    overflow-y: auto;
    padding: 16px;
    margin-bottom: 16px;
    background: rgba(0,0,0,0.2);
    border-radius: var(--radius-sm);
    border: 1px solid var(--glass-border);
}

.chat-message {
    margin-bottom: 16px;
    display: flex;
    gap: 12px;
}

.chat-message.user { flex-direction: row-reverse; }
.chat-message .chat-avatar {
    width: 36px; height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    flex-shrink: 0;
}
.chat-message.assistant .chat-avatar { background: var(--accent-dim); }
.chat-message.user .chat-avatar { background: rgba(255,255,255,0.05); }

.chat-bubble {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    max-width: 75%;
    line-height: 1.5;
    font-size: 0.95rem;
}

.chat-message.assistant .chat-bubble {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
}

.chat-message.user .chat-bubble {
    background: var(--accent-dim);
    border: 1px solid var(--accent);
}

.chat-input-area {
    display: flex;
    gap: 12px;
    align-items: flex-end;
}

#chatInput {
    flex: 1;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    padding: 12px 16px;
    color: var(--text);
    font-family: inherit;
    font-size: 0.95rem;
    resize: none;
    transition: var(--transition);
}

#chatInput:focus { outline: none; border-color: var(--accent); }

.chat-loading {
    text-align: center;
    padding: 20px;
    color: var(--text-dim);
}

.chat-loading-spinner {
    width: 32px; height: 32px;
    border: 3px solid var(--glass-border);
    border-top-color: var(--accent);
    border-radius: 50%;
    margin: 0 auto 12px;
    animation: spin 1s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.chat-status { text-align: center; font-size: 0.85rem; color: var(--text-muted); margin-top: 8px; }

/* EVALUATION */
.gespraech-evaluation { padding: 20px; }
.gespraech-evaluation h2 { margin-bottom: 20px; text-align: center; }

.eval-badge {
    display: inline-block;
    padding: 8px 20px;
    border-radius: 24px;
    font-weight: 600;
    margin-bottom: 16px;
}

.eval-badge.bestanden { background: rgba(46,204,113,0.15); color: var(--success); }
.eval-badge.verbesserungsbedürftig { background: rgba(243,156,18,0.15); color: var(--warning); }
.eval-badge.verbesserungsbeduerftig { background: rgba(243,156,18,0.15); color: var(--warning); }

.eval-section { margin-bottom: 20px; }
.eval-section h4 { color: var(--accent); margin-bottom: 8px; }
.eval-section ul { margin-left: 20px; }
.eval-section li { color: var(--text-dim); margin-bottom: 6px; }

.gespraech-eval-actions { display: flex; gap: 12px; justify-content: center; margin-top: 24px; }

/* SIDEBAR */
.gespraech-sidebar { padding: 20px; }
.gespraech-sidebar h3 { font-size: 1rem; margin-bottom: 16px; }

.conversation-list { display: flex; flex-direction: column; gap: 4px; }

.conversation-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.85rem;
}

.conversation-item:hover { background: var(--glass-bg); }
.conv-status.completed { color: var(--success); }
.conv-status.active { color: var(--warning); }
.conv-date { color: var(--text-muted); font-size: 0.8rem; }
.conv-label { flex: 1; }

.no-data { color: var(--text-muted); font-size: 0.85rem; padding: 12px 0; }

/* DASHBOARD */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
    margin-bottom: 32px;
}

.stat-card {
    padding: 24px;
    text-align: center;
}

.stat-icon { font-size: 2rem; margin-bottom: 8px; }
.stat-value { font-size: 2rem; font-weight: 700; color: var(--accent); }
.stat-label { color: var(--text-dim); font-size: 0.9rem; margin-top: 4px; }
.stat-sub { color: var(--text-muted); font-size: 0.8rem; margin-top: 8px; }

.recommendations-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
}

.recommendation-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px;
    text-decoration: none;
    color: var(--text);
    transition: var(--transition);
    border: 1px solid var(--glass-border);
}

.recommendation-card:hover {
    border-color: var(--accent);
    background: var(--accent-dim);
}

.rec-icon { font-size: 1.8rem; flex-shrink: 0; }
.recommendation-card h3 { font-size: 1rem; margin-bottom: 4px; }
.recommendation-card p { color: var(--text-dim); font-size: 0.9rem; }

.quiz-history-list, .conv-history-list { padding: 20px; }

.conv-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 0;
    border-bottom: 1px solid var(--glass-border);
    font-size: 0.9rem;
}
.conv-item:last-child { border-bottom: none; }

.conv-eval-badge {
    background: var(--accent-dim);
    color: var(--accent);
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 0.75rem;
}

/* MODAL */
.modal-overlay {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(0,0,0,0.7);
    backdrop-filter: blur(8px);
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal {
    padding: 36px;
    max-width: 420px;
    width: 90%;
    position: relative;
}

.modal h2 { font-size: 1.4rem; margin-bottom: 8px; }
.modal-subtitle { color: var(--text-dim); font-size: 0.9rem; margin-bottom: 24px; }

.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 0.85rem; color: var(--text-dim); margin-bottom: 6px; }

.form-group input {
    width: 100%;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    padding: 12px 16px;
    color: var(--text);
    font-family: inherit;
    font-size: 0.95rem;
    transition: var(--transition);
}

.form-group input:focus { outline: none; border-color: var(--accent); }

.modal-close {
    position: absolute;
    top: 16px; right: 16px;
    background: none;
    border: none;
    color: var(--text-dim);
    font-size: 1.5rem;
    cursor: pointer;
}

/* FOOTER */
.footer {
    text-align: center;
    padding: 32px 24px;
    color: var(--text-muted);
    font-size: 0.85rem;
    border-top: 1px solid var(--glass-border);
    margin-top: 48px;
}

.footer-note { font-size: 0.8rem; margin-top: 4px; }

/* TOAST */
.toast {
    position: fixed;
    bottom: 24px;
    right: 24px;
    background: var(--bg-light);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    padding: 12px 20px;
    color: var(--text);
    font-size: 0.9rem;
    z-index: 300;
    box-shadow: var(--shadow);
    animation: slideIn 0.3s ease;
}

.toast.success { border-color: var(--success); }
.toast.error { border-color: var(--danger); }

@keyframes slideIn {
    from { transform: translateX(100px); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

/* RESPONSIVE */
@media (max-width: 768px) {
    .theory-layout, .gespraech-layout {
        grid-template-columns: 1fr;
    }
    .hero-title { font-size: 1.8rem; }
    .hero-content { padding: 32px 20px; }
    .tracks-grid { grid-template-columns: 1fr; }
    .nav-user { display: none; }
    .container { padding: 16px; }
}