/* ===== CSS Variables ===== */
:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-card: #1c2128;
    --bg-hover: #21262d;
    --accent: #1f6feb;
    --accent-hover: #388bfd;
    --accent-light: #1f6feb22;
    --success: #3fb950;
    --danger: #f85149;
    --warning: #d29922;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-muted: #6e7681;
    --border: #30363d;
    --border-light: #21262d;
    --sidebar-width: 220px;
    --radius: 8px;
    --radius-lg: 12px;
}

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

html, body {
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 14px;
    line-height: 1.6;
}

/* ===== Layout ===== */
.app-layout {
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* ===== Sidebar ===== */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    overflow-y: auto;
}

.sidebar-header {
    padding: 20px 16px;
    border-bottom: 1px solid var(--border);
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    font-size: 24px;
    color: var(--accent);
}

.logo-title {
    font-size: 13px;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
}

.logo-sub {
    font-size: 11px;
    color: var(--text-secondary);
}

.nav-list {
    list-style: none;
    padding: 12px 8px;
    flex: 1;
}

.nav-item { margin-bottom: 2px; }

.nav-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 12px;
    border-radius: var(--radius);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 13px;
    font-weight: 500;
    transition: all 0.15s ease;
}

.nav-link:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.nav-link.active {
    background: var(--accent-light);
    color: var(--accent-hover);
}

.nav-icon { font-size: 16px; }

/* ===== Main Content ===== */
.main-content {
    flex: 1;
    overflow-y: auto;
    background: var(--bg-primary);
}

.page {
    display: none;
    padding: 28px 32px;
    max-width: 1100px;
    animation: fadeIn 0.2s ease;
}

.page.active { display: block; }

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ===== Page Header ===== */
.page-header {
    margin-bottom: 24px;
}

.page-header h1 {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
}

.page-header p {
    color: var(--text-secondary);
    margin-top: 4px;
    font-size: 13px;
}

/* ===== Cards ===== */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 20px;
    margin-bottom: 16px;
}

.card-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* ===== Stats Grid ===== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 18px;
    text-align: center;
}

.stat-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--accent-hover);
    line-height: 1;
    margin-bottom: 4px;
}

.stat-label {
    font-size: 12px;
    color: var(--text-secondary);
}

/* ===== Grid ===== */
.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: var(--radius);
    border: 1px solid transparent;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s ease;
    text-decoration: none;
}

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

.btn-primary:hover { background: var(--accent-hover); }

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

.btn-secondary:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    border-color: var(--text-secondary);
}

.btn-success {
    background: var(--success);
    color: #fff;
    border-color: var(--success);
}

.btn-danger {
    background: var(--danger);
    color: #fff;
    border-color: var(--danger);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-lg { padding: 12px 24px; font-size: 15px; }

/* ===== Form Elements ===== */
.form-group { margin-bottom: 16px; }

.form-label {
    display: block;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 6px;
}

.form-control {
    width: 100%;
    padding: 9px 12px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-size: 13px;
    transition: border-color 0.15s;
}

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

.form-control option { background: var(--bg-secondary); }

select.form-control { cursor: pointer; }

/* ===== Toggle ===== */
.toggle-group {
    display: flex;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 3px;
    gap: 3px;
}

.toggle-btn {
    flex: 1;
    padding: 6px 12px;
    border: none;
    border-radius: 6px;
    background: transparent;
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s;
}

.toggle-btn.active {
    background: var(--accent);
    color: #fff;
}

/* ===== Quiz ===== */
.question-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 16px;
}

.question-text {
    font-size: 16px;
    font-weight: 500;
    color: var(--text-primary);
    line-height: 1.6;
    margin-bottom: 20px;
}

.options-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.option-btn {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-size: 13px;
    text-align: left;
    cursor: pointer;
    transition: all 0.15s;
}

.option-btn:hover:not(:disabled) {
    border-color: var(--accent);
    background: var(--accent-light);
}

.option-btn.selected {
    border-color: var(--accent);
    background: var(--accent-light);
    color: var(--accent-hover);
}

.option-btn.correct {
    border-color: var(--success);
    background: #3fb95022;
    color: var(--success);
}

.option-btn.wrong {
    border-color: var(--danger);
    background: #f8514922;
    color: var(--danger);
}

.option-btn:disabled { cursor: default; }

.feedback-box {
    padding: 16px;
    border-radius: var(--radius);
    margin-top: 16px;
    font-size: 13px;
    line-height: 1.7;
}

.feedback-correct {
    background: #3fb95015;
    border: 1px solid var(--success);
    color: var(--success);
}

.feedback-wrong {
    background: #f8514915;
    border: 1px solid var(--danger);
    color: var(--danger);
}

.feedback-box .erklaerung {
    color: var(--text-secondary);
    margin-top: 8px;
    padding-top: 8px;
    border-top: 1px solid var(--border);
}

.open-answer textarea {
    width: 100%;
    min-height: 120px;
    padding: 12px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-size: 13px;
    line-height: 1.6;
    resize: vertical;
    font-family: inherit;
}

.open-answer textarea:focus {
    outline: none;
    border-color: var(--accent);
}

.score-badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 700;
}

.score-high { background: #3fb95022; color: var(--success); }
.score-mid { background: #d2992222; color: var(--warning); }
.score-low { background: #f8514922; color: var(--danger); }

/* ===== Chat (Fallstudien) ===== */
.chat-container {
    display: flex;
    flex-direction: column;
    height: calc(100vh - 200px);
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.chat-message {
    display: flex;
    gap: 10px;
    max-width: 85%;
}

.chat-message.arzt {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.chat-message.patient { align-self: flex-start; }
.chat-message.system { align-self: center; max-width: 95%; }

.msg-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    flex-shrink: 0;
}

.arzt .msg-avatar { background: var(--accent); color: #fff; }
.patient .msg-avatar { background: var(--bg-hover); color: var(--text-secondary); }

.msg-bubble {
    padding: 10px 14px;
    border-radius: 12px;
    font-size: 13px;
    line-height: 1.6;
}

.arzt .msg-bubble {
    background: var(--accent);
    color: #fff;
    border-bottom-right-radius: 4px;
}

.patient .msg-bubble {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    border-bottom-left-radius: 4px;
}

.system .msg-bubble {
    background: #d2992215;
    border: 1px solid var(--warning);
    color: var(--text-primary);
    border-radius: var(--radius);
    font-size: 12px;
    width: 100%;
}

.chat-input-area {
    display: flex;
    gap: 8px;
    padding: 12px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-top: none;
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.chat-input {
    flex: 1;
    padding: 10px 14px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-size: 13px;
    font-family: inherit;
    resize: none;
}

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

/* ===== Markdown ===== */
.markdown-content {
    line-height: 1.8;
    color: var(--text-primary);
}

.markdown-content h1,
.markdown-content h2,
.markdown-content h3 {
    color: var(--text-primary);
    margin: 16px 0 8px;
    font-weight: 600;
}

.markdown-content h2 { font-size: 16px; color: var(--accent-hover); }
.markdown-content h3 { font-size: 14px; color: var(--text-secondary); }

.markdown-content p { margin-bottom: 10px; }

.markdown-content ul, .markdown-content ol {
    padding-left: 20px;
    margin-bottom: 10px;
}

.markdown-content li { margin-bottom: 4px; }

.markdown-content strong { color: var(--text-primary); font-weight: 600; }

.markdown-content code {
    background: var(--bg-hover);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 12px;
    color: var(--accent-hover);
}

.markdown-content blockquote {
    border-left: 3px solid var(--accent);
    padding-left: 12px;
    color: var(--text-secondary);
    margin: 10px 0;
}

/* ===== Lernplan ===== */
.week-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
}

.week-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 16px;
}

.week-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.week-number {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--accent);
    letter-spacing: 1px;
}

.week-hours {
    font-size: 12px;
    color: var(--text-secondary);
}

.week-focus {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.week-themen {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.thema-tag {
    background: var(--accent-light);
    color: var(--accent-hover);
    padding: 3px 8px;
    border-radius: 4px;
    font-size: 11px;
}

/* ===== Progress bars ===== */
.progress-bar-wrap {
    background: var(--bg-secondary);
    border-radius: 4px;
    height: 6px;
    overflow: hidden;
    margin-top: 6px;
}

.progress-bar {
    height: 100%;
    background: var(--accent);
    border-radius: 4px;
    transition: width 0.4s ease;
}

.progress-bar.good { background: var(--success); }
.progress-bar.warn { background: var(--warning); }
.progress-bar.bad { background: var(--danger); }

/* ===== Quick Buttons ===== */
.quick-btns {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 16px;
}

.quick-btn {
    padding: 6px 12px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 20px;
    color: var(--text-secondary);
    font-size: 12px;
    cursor: pointer;
    transition: all 0.15s;
}

.quick-btn:hover {
    border-color: var(--accent);
    color: var(--accent-hover);
    background: var(--accent-light);
}

/* ===== Loading ===== */
.loading {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 16px;
    color: var(--text-secondary);
    font-size: 13px;
}

.spinner {
    width: 18px;
    height: 18px;
    border: 2px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}

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

/* ===== Toast ===== */
#toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    z-index: 9999;
}

.toast {
    padding: 12px 18px;
    border-radius: var(--radius);
    font-size: 13px;
    font-weight: 500;
    min-width: 220px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.4);
    animation: slideIn 0.2s ease;
    border-left: 3px solid;
}

.toast-success {
    background: #1c2b1f;
    border-color: var(--success);
    color: var(--success);
}

.toast-error {
    background: #2b1c1c;
    border-color: var(--danger);
    color: var(--danger);
}

.toast-info {
    background: var(--bg-card);
    border-color: var(--accent);
    color: var(--text-primary);
}

@keyframes slideIn {
    from { opacity: 0; transform: translateX(20px); }
    to { opacity: 1; transform: translateX(0); }
}

/* ===== Chart Container ===== */
.chart-wrap {
    position: relative;
    height: 300px;
}

/* ===== Einleitung Box ===== */
.einleitung-box {
    background: #1f2937;
    border: 1px solid var(--warning);
    border-radius: var(--radius);
    padding: 14px 16px;
    margin-bottom: 16px;
    font-size: 13px;
    line-height: 1.7;
    color: var(--text-primary);
}

.einleitung-box strong {
    color: var(--warning);
    display: block;
    margin-bottom: 6px;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .sidebar { width: 60px; }
    .logo-title, .logo-sub, .nav-link span:last-child { display: none; }
    .nav-link { justify-content: center; padding: 10px; }
    .page { padding: 16px; }
    .grid-2 { grid-template-columns: 1fr; }
    .week-grid { grid-template-columns: 1fr; }
}

/* ===== Divider ===== */
.divider {
    height: 1px;
    background: var(--border);
    margin: 16px 0;
}

/* ===== Empty state ===== */
.empty-state {
    text-align: center;
    padding: 40px;
    color: var(--text-muted);
}

.empty-state .icon { font-size: 32px; margin-bottom: 12px; }
.empty-state p { font-size: 13px; }

/* ─── Login Overlay ──────────────────────────────────────────────────────────── */
.login-overlay {
  position: fixed; inset: 0;
  background: #0d1117;
  display: flex; align-items: center; justify-content: center;
  z-index: 9999;
}
.login-box {
  background: #161b22;
  border: 1px solid #30363d;
  border-radius: 10px;
  padding: 40px 36px;
  width: 100%; max-width: 380px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.5);
}
.login-logo { font-size: 22px; font-weight: 700; text-align: center; margin-bottom: 6px; color: #e6edf3; }
.login-title { font-size: 14px; text-align: center; color: #8b949e; margin-bottom: 28px; }
.login-error { color: #f85149; font-size: 13px; min-height: 18px; margin-bottom: 10px; }