/* Memory Bridge — Elderly-friendly, warm, high-contrast design */

:root {
    --bg: #faf8f5;
    --card-bg: #ffffff;
    --primary: #2d6a4f;
    --primary-light: #52b788;
    --primary-dark: #1b4332;
    --accent: #e07a5f;
    --accent-light: #f2cc8f;
    --text: #2b2b2b;
    --text-light: #6b6b6b;
    --success: #40916c;
    --error: #c1121f;
    --border: #d4d0ca;
    --shadow: 0 2px 12px rgba(0,0,0,0.08);
    --radius: 16px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    background: var(--bg);
    color: var(--text);
    font-size: 20px;
    line-height: 1.5;
    min-height: 100vh;
}

/* --- Login Page --- */

.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.login-container {
    text-align: center;
    width: 100%;
    max-width: 440px;
}

.login-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 48px 36px;
    margin-bottom: 24px;
}

.app-title {
    font-size: 36px;
    font-weight: 700;
    color: var(--primary-dark);
    margin-bottom: 8px;
}

.app-subtitle {
    font-size: 18px;
    color: var(--text-light);
    margin-bottom: 36px;
}

.login-form label {
    display: block;
    font-size: 16px;
    color: var(--text-light);
    margin-bottom: 8px;
    text-align: left;
}

.login-form input {
    width: 100%;
    padding: 16px 20px;
    font-size: 20px;
    border: 2px solid var(--border);
    border-radius: 12px;
    margin-bottom: 20px;
    outline: none;
    transition: border-color 0.2s;
}

.login-form input:focus {
    border-color: var(--primary);
}

.footer-text {
    font-size: 14px;
    color: var(--text-light);
}

.error-text {
    color: var(--error);
    font-size: 16px;
    margin-top: 12px;
}

/* --- Buttons --- */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 28px;
    font-size: 18px;
    font-weight: 600;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
}

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

.btn-primary {
    background: var(--primary);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    background: var(--primary-dark);
}

.btn-large {
    width: 100%;
    padding: 18px;
    font-size: 22px;
}

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

.btn-secondary:hover:not(:disabled) {
    background: #c4c0ba;
}

.btn-success {
    background: var(--success);
    color: white;
}

.btn-accent {
    background: var(--accent);
    color: white;
}

.btn-accent:hover:not(:disabled) {
    background: #c86a50;
}

.btn-small {
    padding: 8px 16px;
    font-size: 14px;
    border-radius: 8px;
}

/* --- Training Page --- */

.train-page {
    padding: 10px 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
    height: 100vh;
    height: 100dvh;
    overflow: hidden;
}

.train-header {
    width: 100%;
    max-width: 600px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 6px;
    flex-shrink: 0;
}

.train-header h2 {
    font-size: 20px;
    color: var(--primary-dark);
}

.progress-bar {
    width: 100%;
    max-width: 600px;
    height: 8px;
    background: var(--border);
    border-radius: 4px;
    margin-bottom: 8px;
    overflow: hidden;
    flex-shrink: 0;
}

.progress-fill {
    height: 100%;
    background: var(--primary-light);
    border-radius: 5px;
    transition: width 0.4s ease;
}

.card-container {
    width: 100%;
    max-width: 600px;
    flex: 1;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

.train-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 20px 24px;
    text-align: center;
    margin-bottom: 12px;
}

.card-category {
    font-size: 13px;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.card-image {
    width: 100%;
    max-width: 440px;
    min-height: 100px;
    margin: 0 auto 16px;
    border-radius: 16px;
    overflow: hidden;
    background: linear-gradient(135deg, #f0f7f4, #e8f0eb);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
}

.card-image img {
    max-width: 100%;
    max-height: 240px;
    object-fit: contain;
    border-radius: 12px;
}

.visual-prompt {
    text-align: center;
    padding: 8px;
}

.visual-prompt .prompt-emoji {
    font-size: 224px;
    line-height: 1;
    margin-bottom: 10px;
}

.visual-prompt .prompt-hint {
    font-size: 22px;
    color: #2b2b2b;
    font-weight: 500;
    line-height: 1.4;
}

.card-prompt {
    font-size: 22px;
    font-weight: 600;
    color: var(--primary-dark);
    margin-bottom: 14px;
}

.options-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.option-btn {
    padding: 14px 12px;
    font-size: 20px;
    font-weight: 500;
    background: var(--bg);
    border: 3px solid var(--border);
    border-radius: 14px;
    cursor: pointer;
    transition: all 0.2s;
    color: var(--text);
    min-height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.option-btn:hover {
    border-color: var(--primary);
    background: #eef5f0;
}

.option-btn.correct {
    border-color: var(--success);
    background: #d8f3dc;
    color: var(--primary-dark);
}

.option-btn.wrong {
    border-color: var(--error);
    background: #fde8e8;
    color: var(--error);
}

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

.feedback-area {
    margin-top: 24px;
    padding: 20px;
    border-radius: 12px;
    font-size: 22px;
    font-weight: 600;
    display: none;
}

.feedback-correct {
    background: #d8f3dc;
    color: var(--primary-dark);
}

.feedback-wrong {
    background: #fff3cd;
    color: #664d03;
}

.hint-btn {
    margin-top: 16px;
    background: none;
    border: 2px dashed var(--border);
    color: var(--text-light);
    padding: 10px 20px;
    border-radius: 10px;
    font-size: 16px;
    cursor: pointer;
}

.hint-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.hint-text {
    margin-top: 12px;
    font-size: 18px;
    color: var(--primary);
    font-style: italic;
}

.next-btn {
    margin-top: 24px;
}

/* Session complete */
.session-complete {
    text-align: center;
    padding: 48px 32px;
}

.session-complete h2 {
    font-size: 32px;
    color: var(--primary-dark);
    margin-bottom: 16px;
}

.session-score {
    font-size: 60px;
    font-weight: 700;
    color: var(--primary);
    margin: 24px 0;
}

.session-message {
    font-size: 20px;
    color: var(--text-light);
    margin-bottom: 32px;
    line-height: 1.6;
}

/* --- Admin Page --- */

.admin-page {
    padding: 20px;
    max-width: 1100px;
    margin: 0 auto;
}

.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
    flex-wrap: wrap;
    gap: 12px;
}

.admin-header h1 {
    font-size: 28px;
    color: var(--primary-dark);
}

.admin-nav {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.admin-nav .btn {
    font-size: 15px;
    padding: 10px 18px;
}

.admin-section {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 28px;
    margin-bottom: 24px;
}

.admin-section h2 {
    font-size: 22px;
    color: var(--primary-dark);
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--bg);
}

/* Tables */
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 16px;
}

.data-table th {
    text-align: left;
    padding: 12px;
    background: var(--bg);
    font-weight: 600;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-light);
}

.data-table td {
    padding: 12px;
    border-bottom: 1px solid var(--bg);
    vertical-align: middle;
}

.data-table tr:hover td {
    background: #faf8f5;
}

/* Forms */
.form-row {
    display: flex;
    gap: 12px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.form-row input, .form-row select {
    padding: 12px 16px;
    font-size: 16px;
    border: 2px solid var(--border);
    border-radius: 10px;
    outline: none;
    flex: 1;
    min-width: 150px;
}

.form-row input:focus, .form-row select:focus {
    border-color: var(--primary);
}

.form-row textarea {
    padding: 12px 16px;
    font-size: 16px;
    border: 2px solid var(--border);
    border-radius: 10px;
    outline: none;
    flex: 1;
    min-height: 60px;
    resize: vertical;
    font-family: inherit;
}

/* AI Analysis */
.ai-report {
    background: #f0f7f4;
    border-radius: 12px;
    padding: 24px;
    margin-top: 16px;
    white-space: pre-wrap;
    font-size: 16px;
    line-height: 1.7;
}

.ai-report strong, .ai-report b {
    color: var(--primary-dark);
}

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

.stat-card {
    background: var(--bg);
    border-radius: 12px;
    padding: 20px;
    text-align: center;
}

.stat-value {
    font-size: 36px;
    font-weight: 700;
    color: var(--primary);
}

.stat-label {
    font-size: 14px;
    color: var(--text-light);
    margin-top: 4px;
}

/* Key display */
.key-display {
    background: #fff8e1;
    border: 2px solid #ffe082;
    border-radius: 8px;
    padding: 8px 14px;
    font-family: monospace;
    font-size: 15px;
    word-break: break-all;
    display: inline-block;
}

/* Badge */
.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
}

.badge-admin { background: #e0cffc; color: #5a189a; }
.badge-user { background: #d8f3dc; color: var(--primary-dark); }

/* Responsive — Tablet (iPad) */
@media (max-width: 1024px) {
    .admin-page { padding: 16px; }
    .grid-2col { grid-template-columns: 1fr; }
    .data-table { font-size: 14px; }
    .data-table th, .data-table td { padding: 10px 8px; }
    .tab-btn { padding: 10px 14px; font-size: 14px; }
}

/* Responsive — Mobile */
@media (max-width: 600px) {
    body { font-size: 18px; }

    /* Training */
    .options-grid { grid-template-columns: 1fr; }
    .option-btn { font-size: 20px; min-height: 60px; }
    .train-card { padding: 16px 16px; }
    .card-prompt { font-size: 22px; }
    .card-image { width: 100%; max-width: 280px; min-height: 80px; }
    .visual-prompt .prompt-emoji { font-size: 160px; }
    .visual-prompt .prompt-hint { font-size: 18px; }

    /* Login */
    .login-card { padding: 28px 20px; }
    .app-title { font-size: 28px; }

    /* Admin */
    .admin-page { padding: 12px; }
    .admin-header h1 { font-size: 22px; }
    .admin-section { padding: 16px; margin-bottom: 16px; }
    .admin-section h2 { font-size: 18px; margin-bottom: 14px; }
    .stats-grid { grid-template-columns: 1fr 1fr; gap: 10px; }
    .stat-card { padding: 14px; }
    .stat-value { font-size: 28px; }
    .stat-label { font-size: 12px; }
    .form-row { flex-direction: column; }
    .form-row input, .form-row select { min-width: 0; }
    .grid-2col { grid-template-columns: 1fr; }

    /* Tables scroll on mobile */
    .data-table { font-size: 13px; }
    .data-table th, .data-table td { padding: 8px 6px; }

    /* Tabs scroll horizontally */
    .tab-bar { overflow-x: auto; -webkit-overflow-scrolling: touch; flex-wrap: nowrap; }
    .tab-btn { padding: 10px 12px; font-size: 13px; white-space: nowrap; flex-shrink: 0; }

    /* Key display */
    .key-display { font-size: 12px; padding: 6px 10px; }
}

/* Logout link */
.logout-link {
    color: var(--text-light);
    font-size: 15px;
    cursor: pointer;
    text-decoration: underline;
}

/* Loading spinner */
.spinner {
    display: inline-block;
    width: 24px;
    height: 24px;
    border: 3px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Tabs for admin */
.tab-bar {
    display: flex;
    gap: 4px;
    margin-bottom: 24px;
    border-bottom: 2px solid var(--border);
    padding-bottom: 0;
}

.tab-btn {
    padding: 12px 24px;
    font-size: 16px;
    font-weight: 600;
    background: none;
    border: none;
    border-bottom: 3px solid transparent;
    cursor: pointer;
    color: var(--text-light);
    margin-bottom: -2px;
    transition: all 0.2s;
}

.tab-btn.active {
    color: var(--primary-dark);
    border-bottom-color: var(--primary);
}

.tab-btn:hover {
    color: var(--primary);
}

.tab-content { display: none; }
.tab-content.active { display: block; }