/* =========================================================
   NeuroTrain - Basis-Styles (Mobile First)
   ========================================================= */

:root {
    --color-primary: #5b4de8;
    --color-primary-dark: #4335c4;
    --color-accent: #17c3b2;
    --color-success: #22a35a;
    --color-error: #e04b4b;
    --color-bg: #f5f6fb;
    --color-surface: #ffffff;
    --color-text: #1f2333;
    --color-text-muted: #6b7080;
    --color-border: #e2e4ef;

    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;

    --shadow-sm: 0 1px 3px rgba(20, 20, 50, 0.06);
    --shadow-md: 0 6px 20px rgba(20, 20, 50, 0.10);

    --space-1: 4px;
    --space-2: 8px;
    --space-3: 16px;
    --space-4: 24px;
    --space-5: 40px;

    font-size: 16px;
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Segoe UI', Roboto, -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

h1, h2, h3, h4 {
    line-height: 1.25;
    margin: 0 0 var(--space-3);
}

p {
    margin: 0 0 var(--space-3);
}

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

a:hover {
    text-decoration: underline;
}

img, svg {
    max-width: 100%;
    display: block;
}

/* ---- Layout ---- */

.container {
    width: 100%;
    max-width: 960px;
    margin: 0 auto;
    padding: 0 var(--space-3);
}

main {
    flex: 1;
    padding: var(--space-4) 0 var(--space-5);
}

/* ---- Navigation ---- */

.navbar {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 50;
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: var(--space-2);
    padding-bottom: var(--space-2);
    flex-wrap: wrap;
    gap: var(--space-2);
}

.navbar-brand {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary-dark);
    display: flex;
    align-items: center;
    gap: 6px;
}

.navbar-brand:hover {
    text-decoration: none;
}

.navbar-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-surface);
    font-size: 1.1rem;
}

.navbar-links {
    display: none;
    width: 100%;
    flex-direction: column;
    gap: var(--space-1);
    padding-bottom: var(--space-2);
}

.navbar-links.open {
    display: flex;
}

.navbar-links a, .navbar-links button.link-like {
    display: block;
    padding: var(--space-2) var(--space-2);
    border-radius: var(--radius-sm);
    color: var(--color-text);
    font-weight: 500;
}

.navbar-links a.active {
    color: var(--color-primary-dark);
    background: #efedff;
}

.navbar-links a:hover {
    background: #f0f1fa;
    text-decoration: none;
}

@media (min-width: 720px) {
    .navbar-toggle {
        display: none;
    }

    .navbar-links {
        display: flex !important;
        flex-direction: row;
        width: auto;
        padding-bottom: 0;
        align-items: center;
    }
}

/* ---- Buttons ---- */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 44px;
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    background: var(--color-primary);
    color: #fff;
    transition: background 0.15s ease, transform 0.05s ease;
}

.btn:hover {
    background: var(--color-primary-dark);
    text-decoration: none;
    color: #fff;
}

.btn:active {
    transform: scale(0.98);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

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

.btn-secondary:hover {
    background: #f0f1fa;
    color: var(--color-text);
}

.btn-danger {
    background: var(--color-error);
}

.btn-block {
    width: 100%;
}

/* ---- Cards ---- */

.card {
    background: var(--color-surface);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    padding: var(--space-4);
    margin-bottom: var(--space-4);
}

.card-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-3);
}

@media (min-width: 640px) {
    .card-grid.cols-2 {
        grid-template-columns: 1fr 1fr;
    }
}

@media (min-width: 900px) {
    .card-grid.cols-3 {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* ---- Forms ---- */

.form-group {
    margin-bottom: var(--space-3);
}

label {
    display: block;
    font-weight: 600;
    margin-bottom: 6px;
    font-size: 0.9rem;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
select {
    width: 100%;
    min-height: 44px;
    padding: 10px 12px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    background: #fff;
    color: var(--color-text);
}

input:focus, select:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 1px;
}

.form-hint {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-top: 4px;
}

/* ---- Alerts / Flash ---- */

.alert {
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-sm);
    margin-bottom: var(--space-3);
    font-size: 0.95rem;
}

.alert-success {
    background: #e6f7ed;
    color: var(--color-success);
}

.alert-error {
    background: #fdecec;
    color: var(--color-error);
}

.alert-info {
    background: #eef0ff;
    color: var(--color-primary-dark);
}

/* ---- Utilities ---- */

.hidden { display: none !important; }
.text-center { text-align: center; }
.text-muted { color: var(--color-text-muted); }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }

/* ---- Footer ---- */

.site-footer {
    text-align: center;
    padding: var(--space-3);
    color: var(--color-text-muted);
    font-size: 0.85rem;
}

/* ---- Dashboard / Hero ---- */

.hero {
    text-align: center;
    padding: var(--space-5) var(--space-3);
}

.hero h1 {
    font-size: 1.75rem;
}

@media (min-width: 640px) {
    .hero h1 {
        font-size: 2.25rem;
    }
}

.stat-box {
    background: var(--color-surface);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    padding: var(--space-3);
    text-align: center;
}

.stat-box .value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-primary-dark);
}

.stat-box .label {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* ---- Run / Training screen ---- */

.run-topbar {
    position: sticky;
    top: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-2) 0;
    z-index: 40;
}

.run-topbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
}

.timer {
    font-size: 1.4rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    color: var(--color-primary-dark);
}

.timer.warning {
    color: var(--color-error);
}

.progress-track {
    height: 6px;
    background: var(--color-border);
    border-radius: 4px;
    overflow: hidden;
    margin-top: 6px;
}

.progress-fill {
    height: 100%;
    background: var(--color-accent);
    transition: width 1s linear;
}

.task-card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--space-4);
    margin-top: var(--space-4);
}

.task-type-label {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--color-primary);
    background: #efedff;
    padding: 4px 10px;
    border-radius: 999px;
    margin-bottom: var(--space-3);
}

.task-question {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: var(--space-4);
    text-align: center;
}

.options-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-2);
}

@media (min-width: 520px) {
    .options-grid.grid-2 {
        grid-template-columns: 1fr 1fr;
    }
}

.option-btn {
    min-height: 56px;
    padding: 12px 16px;
    border-radius: var(--radius-md);
    border: 2px solid var(--color-border);
    background: #fff;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    text-align: center;
    transition: border-color 0.15s ease, background 0.15s ease;
}

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

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

.option-btn.selected {
    border-color: var(--color-primary);
    background: #efedff;
}

.option-btn.correct {
    border-color: var(--color-success);
    background: #e6f7ed;
}

.option-btn.incorrect {
    border-color: var(--color-error);
    background: #fdecec;
}

.matrix-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 6px;
    max-width: 280px;
    margin: 0 auto var(--space-4);
}

.matrix-cell {
    aspect-ratio: 1 / 1;
    background: #fbfbfe;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.matrix-cell.missing {
    background: repeating-linear-gradient(45deg, #f0f1fa, #f0f1fa 6px, #e6e7f5 6px, #e6e7f5 12px);
}

.matrix-option .matrix-cell {
    max-width: 70px;
    margin: 0 auto;
}

/* ---- Results ---- */

.score-circle {
    width: 140px;
    height: 140px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    color: #fff;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-4);
}

.score-circle .score-value {
    font-size: 2.5rem;
    font-weight: 800;
}

.solution-item {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-3);
    margin-bottom: var(--space-2);
}

.solution-item.correct {
    border-left: 4px solid var(--color-success);
}

.solution-item.incorrect {
    border-left: 4px solid var(--color-error);
}

/* ---- Tables (Highscores, Admin) ---- */

table {
    width: 100%;
    border-collapse: collapse;
    background: var(--color-surface);
    border-radius: var(--radius-md);
    overflow: hidden;
}

th, td {
    text-align: left;
    padding: 10px 12px;
    border-bottom: 1px solid var(--color-border);
    font-size: 0.95rem;
}

th {
    background: #fafafe;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: var(--color-text-muted);
}

.table-scroll {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

tr.me {
    background: #f5f4ff;
}

.rank-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--color-border);
    font-weight: 700;
    font-size: 0.85rem;
}

.rank-badge.gold { background: #ffd873; }
.rank-badge.silver { background: #dfe2e8; }
.rank-badge.bronze { background: #e8b389; }

/* ---- Tabs (Highscore period switch) ---- */

.tabs {
    display: flex;
    gap: 4px;
    margin-bottom: var(--space-3);
    background: #eceefa;
    padding: 4px;
    border-radius: var(--radius-sm);
    overflow-x: auto;
}

.tab-btn {
    flex: 1;
    min-height: 40px;
    border: none;
    background: transparent;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
    padding: 0 12px;
}

.tab-btn.active {
    background: #fff;
    box-shadow: var(--shadow-sm);
    color: var(--color-primary-dark);
}

/* ---- Gamification: Streak, Rang, XP ---- */

.streak-flame {
    font-size: 1.4rem;
    line-height: 1;
}

.rank-bar {
    height: 10px;
    background: var(--color-border);
    border-radius: 999px;
    overflow: hidden;
    margin: var(--space-2) 0;
}

.rank-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    border-radius: 999px;
    transition: width 0.6s ease;
}

.reward-box {
    background: linear-gradient(135deg, #efedff, #e6fbf8);
    border-radius: var(--radius-md);
    padding: var(--space-3);
    margin: var(--space-3) 0;
}

.reward-xp {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--color-primary-dark);
}

.reward-meta {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.rank-line {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.rank-title {
    font-weight: 700;
}

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

/* ---- Erfolge / Abzeichen ---- */

.ach-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-2);
}

@media (min-width: 560px) {
    .ach-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (min-width: 860px) {
    .ach-grid { grid-template-columns: repeat(4, 1fr); }
}

.ach-badge {
    text-align: center;
    padding: var(--space-3) var(--space-2);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    background: #fff;
}

.ach-badge.locked {
    opacity: 0.45;
    filter: grayscale(1);
}

.ach-badge.earned {
    border-color: var(--color-accent);
    background: #effbf9;
}

.ach-icon {
    font-size: 2rem;
    line-height: 1;
    margin-bottom: 6px;
}

.ach-name {
    font-weight: 700;
    font-size: 0.9rem;
}

.ach-desc {
    font-size: 0.78rem;
    color: var(--color-text-muted);
    margin-top: 2px;
}

.ach-unlock-title {
    font-weight: 700;
    color: var(--color-accent);
    margin: var(--space-3) 0 var(--space-2);
}

.ach-unlock-grid {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    justify-content: center;
    margin-bottom: var(--space-2);
}

.ach-unlock-grid .ach-badge {
    width: 130px;
}

/* ---- Fortschritts-Diagramme (SVG) ---- */

.chart {
    width: 100%;
    height: auto;
    display: block;
    overflow: visible;
}

.chart-empty {
    color: var(--color-text-muted);
    text-align: center;
    padding: var(--space-4);
}

.chart-legend {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-top: var(--space-2);
}

.chart-legend .dot {
    display: inline-block;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    margin-right: 4px;
    vertical-align: middle;
}

/* ---- Dashboard: Aktions-/Hinweiskarten ---- */

.cta-card {
    display: block;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: #fff;
    border-radius: var(--radius-md);
    padding: var(--space-4);
    box-shadow: var(--shadow-sm);
}

.cta-card:hover {
    text-decoration: none;
    color: #fff;
    box-shadow: var(--shadow-md);
}

.cta-card h3 {
    margin-bottom: 4px;
}

.goal-track {
    height: 8px;
    background: var(--color-border);
    border-radius: 999px;
    overflow: hidden;
    margin-top: var(--space-2);
}

.goal-fill {
    height: 100%;
    background: var(--color-success);
    border-radius: 999px;
    transition: width 0.6s ease;
}

/* ---- Gefahrenzone (Konto löschen) ---- */

.danger-zone {
    border: 1px solid #f3c2c2;
    background: #fef7f7;
}

.danger-zone h2 {
    color: var(--color-error);
}