/* webapp/css/style.css */
:root {
    --primary-color: #6366f1;      /* Indigo */
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --accent-color: #0ea5e9;       /* Sky */
    --secondary-color: #64748b;    /* Slate */
    --success-color: #22c55e;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --info-color: #06b6d4;
    --light-color: #ffffff;
    --surface-color: #ffffff;
    --bg-color: #f1f5f9;
    --dark-color: #0f172a;
    --text-color: #1e293b;
    --muted-color: #64748b;
    --border-color: #e2e8f0;

    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;
    --radius-sm: 0.5rem;
    --radius: 0.75rem;
    --radius-lg: 1.25rem;
    --box-shadow: 0 1px 3px rgba(15, 23, 42, 0.08), 0 1px 2px rgba(15, 23, 42, 0.04);
    --box-shadow-md: 0 4px 12px rgba(15, 23, 42, 0.08);
    --box-shadow-lg: 0 12px 32px rgba(15, 23, 42, 0.12);
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --transition: 0.2s ease;
}

* { box-sizing: border-box; }

body {
    font-family: var(--font-family);
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    background-image: radial-gradient(circle at 15% 0%, rgba(99, 102, 241, 0.06), transparent 40%),
                      radial-gradient(circle at 85% 5%, rgba(14, 165, 233, 0.06), transparent 40%);
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

.container {
    width: 90%;
    max-width: 1100px;
    margin: auto;
    padding: 0 20px;
}

/* Header */
header {
    background: var(--gradient-primary);
    color: #fff;
    padding: 1rem 0;
    box-shadow: var(--box-shadow-md);
    position: sticky;
    top: 0;
    z-index: 100;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header h1 {
    margin: 0;
}

header h1 a {
    color: #fff;
    text-decoration: none;
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

header nav {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
}

header nav a {
    color: rgba(255, 255, 255, 0.92);
    text-decoration: none;
    margin-left: 8px;
    padding: 0.5rem 0.9rem;
    border-radius: 999px;
    font-weight: 500;
    font-size: 0.95rem;
    transition: background-color var(--transition), color var(--transition);
}

header nav a:hover {
    background-color: rgba(255, 255, 255, 0.18);
    color: #fff;
}

header nav span {
    margin-right: 10px;
    font-weight: 500;
    opacity: 0.95;
}

main {
    flex-grow: 1;
    padding: 32px 0;
}

footer {
    background: var(--dark-color);
    color: rgba(255, 255, 255, 0.75);
    text-align: center;
    padding: 1.25rem 0;
    margin-top: auto;
    font-size: 0.9rem;
}

/* Flash Messages */
#flash-messages {
    margin-bottom: 1rem;
}
.flash {
    padding: 0.85rem 1.25rem;
    margin-bottom: 1rem;
    border: 1px solid transparent;
    border-radius: var(--radius);
    box-shadow: var(--box-shadow);
    font-weight: 500;
    animation: flash-in 0.3s ease;
}
@keyframes flash-in {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}
.flash.success { color: #14532d; background-color: #dcfce7; border-color: #bbf7d0; }
.flash.error { color: #7f1d1d; background-color: #fee2e2; border-color: #fecaca; }
.flash.info { color: #0c4a6e; background-color: #e0f2fe; border-color: #bae6fd; }

/* Forms / Cards */
.auth-form, .course-selector {
    background: var(--surface-color);
    padding: 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--box-shadow-lg);
    max-width: 460px;
    margin: 2.5rem auto;
    border: 1px solid var(--border-color);
}
.auth-form h2, .course-selector h2 {
    text-align: center;
    margin-bottom: 0.4rem;
    margin-top: 0;
    color: var(--dark-color);
    font-weight: 700;
    letter-spacing: -0.02em;
}
.auth-subtitle {
    text-align: center;
    color: var(--muted-color);
    margin-top: 0;
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

/* Auth Tabs */
.auth-tabs {
    display: flex;
    background: var(--bg-color);
    border-radius: 999px;
    padding: 0.3rem;
    margin-bottom: 1.5rem;
    gap: 0.25rem;
}
.auth-tab {
    flex: 1;
    border: none;
    background: transparent;
    padding: 0.6rem 1rem;
    border-radius: 999px;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--muted-color);
    font-family: inherit;
    transition: background-color var(--transition), color var(--transition), box-shadow var(--transition);
}
.auth-tab.active {
    background: var(--surface-color);
    color: var(--primary-dark);
    box-shadow: var(--box-shadow);
}

.auth-pane { display: none; }
.auth-pane.active { display: block; animation: flash-in 0.25s ease; }

.form-group { margin-bottom: 1.1rem; }
.auth-form label, .course-selector label {
    display: block;
    margin-bottom: 0.4rem;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-color);
}
.auth-form label .optional {
    font-weight: 400;
    color: var(--muted-color);
}
.field-hint {
    display: block;
    margin-top: 0.35rem;
    font-size: 0.82rem;
    color: var(--muted-color);
}
.field-hint.hint-ok { color: var(--success-color); }
.field-hint.hint-error { color: var(--danger-color); }

.auth-form input[type="email"],
.auth-form input[type="text"],
.auth-form input[type="password"],
.course-selector select {
    width: 100%;
    padding: 0.8rem 0.9rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    box-sizing: border-box;
    font-size: 1rem;
    font-family: inherit;
    background: #fff;
    color: var(--text-color);
    transition: border-color var(--transition), box-shadow var(--transition);
}
.auth-form input:focus,
.course-selector select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

/* Voucher Input */
.voucher-input {
    font-family: 'SF Mono', 'Fira Code', ui-monospace, Menlo, Consolas, monospace;
    letter-spacing: 0.15em;
    text-align: center;
    text-transform: uppercase;
    font-size: 1.1rem !important;
    font-weight: 600;
}

/* Buttons */
.btn-primary,
.auth-form button, .course-selector button,
#learn-section button, .actions-dashboard button, .stat-card button {
    display: inline-block;
    background: var(--gradient-primary);
    color: #fff;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    font-family: inherit;
    transition: transform var(--transition), box-shadow var(--transition), filter var(--transition);
    margin-right: 10px;
    margin-bottom: 10px;
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.25);
}
.btn-primary:hover,
.auth-form button:hover, .course-selector button:hover,
#learn-section button:hover, .actions-dashboard button:hover, .stat-card button:hover {
    transform: translateY(-1px);
    filter: brightness(1.05);
    box-shadow: 0 6px 16px rgba(99, 102, 241, 0.35);
}
.btn-primary:active,
.auth-form button:active, .actions-dashboard button:active {
    transform: translateY(0);
}
.btn-block { width: 100%; margin-right: 0; }

/* Button-Link (z. B. "Alle Fragen anzeigen") – war zuvor ungestylt */
.button-link {
    display: inline-block;
    background: var(--surface-color);
    color: var(--primary-dark);
    padding: 0.75rem 1.5rem;
    border: 1.5px solid var(--primary-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    transition: background-color var(--transition), color var(--transition), transform var(--transition), box-shadow var(--transition);
    margin: 5px;
}
.button-link:hover {
    background: var(--primary-color);
    color: #fff;
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(99, 102, 241, 0.3);
}

#submit-auth { width: 100%; }
#form-helper-text {
    font-size: 0.9em;
    color: var(--muted-color);
    text-align: center;
    margin-top: 10px;
}

/* Dashboard */
#dashboard-section h2 {
    color: var(--dark-color);
    margin-bottom: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}
.course-selector {
    max-width: none;
    margin: 0 0 1.5rem 0;
    padding: 1.25rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}
.course-selector label { margin-bottom: 0; white-space: nowrap; }
.course-selector select { max-width: 320px; margin-bottom: 0; }

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.25rem;
    margin-bottom: 2rem;
}
.stat-card {
    background: var(--surface-color);
    padding: 1.5rem;
    border-radius: var(--radius);
    box-shadow: var(--box-shadow);
    border: 1px solid var(--border-color);
    border-top: 4px solid var(--primary-color);
    transition: transform var(--transition), box-shadow var(--transition);
}
.stat-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--box-shadow-lg);
}
.stat-card h3 {
    margin-top: 0;
    color: var(--dark-color);
    font-size: 1.05rem;
    font-weight: 700;
}
.progress-bar-container {
    background-color: #e2e8f0;
    border-radius: 999px;
    margin-bottom: 1rem;
    height: 26px;
    overflow: hidden;
}
.progress-bar {
    background: linear-gradient(90deg, #22c55e, #16a34a);
    height: 100%;
    line-height: 26px;
    color: white;
    text-align: center;
    font-weight: 700;
    font-size: 0.85rem;
    white-space: nowrap;
    transition: width 0.6s ease;
    border-radius: 999px;
}
.box-distribution {
    font-size: 0.9em;
    margin-top: 0.75rem;
}
.box-info {
    display: flex;
    justify-content: space-between;
    padding: 0.3rem 0;
    border-bottom: 1px solid var(--border-color);
}
.box-info:last-child { border-bottom: none; }
.box-info span {
    font-weight: 700;
    color: var(--primary-dark);
    text-align: right;
    margin-left: 5px;
}
.actions-dashboard {
    margin-top: 1.5rem;
    text-align: center;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem;
}
.actions-dashboard button { margin: 0; }

/* Learn Section / Flashcards */
#learn-section {
    max-width: 720px;
    margin: 1.5rem auto;
    background: var(--surface-color);
    padding: 1.75rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--box-shadow-md);
    border: 1px solid var(--border-color);
}
#learn-controls { text-align: right; margin-bottom: 1rem; }
#exam-readiness-live {
    margin-bottom: 1.5rem;
    text-align: center;
}
#exam-readiness-live p {
    font-size: 1.05em;
    margin-bottom: 0.5em;
    font-weight: 500;
}
.flashcard {
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 1.5rem;
    min-height: 250px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    background: linear-gradient(180deg, #ffffff, #fafbff);
}
.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    font-size: 0.9em;
    color: var(--muted-color);
}
#card-box-info {
    background: var(--bg-color);
    padding: 0.3rem 0.75rem;
    border-radius: 999px;
    font-weight: 600;
}
#mark-difficult-btn {
    padding: 0.4rem 0.85rem;
    font-size: 0.8em;
    background: var(--warning-color);
    color: #fff;
    box-shadow: none;
}
#mark-difficult-btn.marked {
    background: var(--danger-color);
    color: white;
}
#card-question {
    font-size: 1.35em;
    font-weight: 600;
    margin-bottom: 20px;
    flex-grow: 1;
    color: var(--dark-color);
}
.options-list label {
    display: block;
    background-color: var(--light-color);
    padding: 0.85rem 1rem;
    margin-bottom: 0.6rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    border: 1.5px solid var(--border-color);
    transition: background-color var(--transition), border-color var(--transition);
}
.options-list label:hover {
    background-color: #f1f5ff;
    border-color: var(--primary-light);
}
.options-list input[type="radio"],
.options-list input[type="checkbox"] {
    margin-right: 10px;
    accent-color: var(--primary-color);
}
.options-list label.correct {
    background-color: #dcfce7 !important;
    border-color: #86efac !important;
    color: #14532d;
}
.options-list label.incorrect {
    background-color: #fee2e2 !important;
    border-color: #fca5a5 !important;
    color: #7f1d1d;
}
#card-explanation {
    margin-top: 20px;
    padding: 1rem 1.25rem;
    background-color: #eef2ff;
    border-left: 4px solid var(--primary-color);
    border-radius: var(--radius-sm);
}
.card-actions {
    margin-top: 20px;
    text-align: center;
}
#reveal-answer-btn {
    width: 60%;
    min-width: 220px;
}
#session-summary {
    margin-top: 2rem;
    text-align: center;
    padding: 1.75rem;
    background: var(--surface-color);
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    box-shadow: var(--box-shadow);
}

/* Exam Simulation */
#exam-question-area .question-block {
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 1px dashed var(--border-color);
}
#exam-question-area .question-block:last-child {
    border-bottom: none;
}
#exam-timer-display {
    text-align: center;
    font-weight: 600;
    font-size: 1.1rem;
    margin-bottom: 1rem;
}
#exam-results {
    margin-top: 20px;
    padding: 1.25rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    background: var(--surface-color);
}
#exam-results .passed { color: var(--success-color); font-weight: 700; }
#exam-results .failed { color: var(--danger-color); font-weight: 700; }

/* Responsive Design */
@media (max-width: 768px) {
    header .container {
        flex-direction: column;
        text-align: center;
        gap: 0.75rem;
    }
    header nav {
        justify-content: center;
    }
    header nav a {
        margin: 3px;
    }
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
    .auth-form { padding: 1.5rem; margin: 1.5rem auto; }
    #reveal-answer-btn { width: 100%; }
}

/* Helper classes */
.hidden {
    display: none !important;
}
button:disabled {
    background: #cbd5e1 !important;
    color: #f8fafc !important;
    cursor: not-allowed;
    box-shadow: none !important;
    transform: none !important;
    filter: none !important;
}
button:disabled:hover {
    background: #cbd5e1 !important;
    transform: none !important;
}