/* ============================================
   Personal Dashboard - Base Styles
   ============================================ */

:root {
    --bg-primary: #0f1117;
    --bg-secondary: #1a1d27;
    --bg-card: #212430;
    --bg-hover: #2a2d3a;
    --text-primary: #e8eaed;
    --text-secondary: #9aa0a6;
    --text-muted: #6b7280;
    --accent-blue: #3b82f6;
    --accent-blue-hover: #2563eb;
    --accent-green: #10b981;
    --accent-purple: #8b5cf6;
    --border-color: #2a2d3a;
    --danger: #ef4444;
    --danger-hover: #dc2626;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: 200ms ease;
    --sidebar-width: 220px;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

.screen {
    display: flex;
    min-height: 100vh;
}

.screen.hidden {
    display: none;
}

.hidden {
    display: none !important;
}

/* ─── Auth Screens ──────────────────────────── */

#screen-login, #screen-register {
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--bg-primary) 0%, #1a1040 50%, var(--bg-primary) 100%);
    padding: 20px;
}

.login-container {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 40px;
    width: 100%;
    max-width: 420px;
    box-shadow: var(--shadow);
}

.login-header {
    text-align: center;
    margin-bottom: 32px;
}

.login-icon {
    color: var(--accent-blue);
    margin-bottom: 16px;
}

.login-header h1 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 8px;
    letter-spacing: -0.02em;
}

.login-subtitle {
    color: var(--text-secondary);
    font-size: 14px;
}

/* ─── Forms ─────────────────────────────────── */

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.form-group input, .form-group select {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 14px;
    font-family: inherit;
    transition: border-color var(--transition), box-shadow var(--transition);
    outline: none;
}

.form-group input:focus, .form-group select:focus {
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.form-group input::placeholder {
    color: var(--text-muted);
}

select {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 14px;
    font-family: inherit;
    outline: none;
}

select:focus {
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.form-row {
    display: flex;
    gap: 12px;
}

.form-row .form-group {
    flex: 1;
}

/* ─── Buttons ───────────────────────────────── */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition);
    width: 100%;
}

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

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

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

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

.btn-sm {
    padding: 6px 12px;
    font-size: 12px;
    width: auto;
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.btn-outline:hover {
    border-color: var(--accent-blue);
    color: var(--accent-blue);
}

.btn-text {
    background: none;
    border: none;
    color: var(--accent-blue);
    padding: 6px 0;
    width: auto;
    font-size: 13px;
    cursor: pointer;
}

.btn-text:hover {
    text-decoration: underline;
}

.btn-icon {
    width: auto;
    padding: 4px 8px;
    background: none;
    border: none;
    font-size: 16px;
    cursor: pointer;
    color: var(--text-muted);
}

.btn-danger-sm {
    width: auto;
    padding: 2px 6px;
    background: none;
    border: none;
    font-size: 14px;
    cursor: pointer;
    color: var(--text-muted);
}

.btn-danger-sm:hover { color: var(--danger); }

.btn-loader {
    display: inline-flex;
    align-items: center;
}

.spinner {
    width: 18px;
    height: 18px;
    animation: spin 1s linear infinite;
}

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

/* ─── Error Messages ────────────────────────── */

.error-message {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: var(--danger);
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    margin-bottom: 20px;
    line-height: 1.5;
}

/* ─── Auth Screen Footer ────────────────────── */

.login-footer {
    text-align: center;
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
}

.login-footer p {
    font-size: 13px;
    color: var(--text-secondary);
}

.login-footer a {
    color: var(--accent-blue);
    text-decoration: none;
    font-weight: 500;
}

.login-footer a:hover {
    text-decoration: underline;
}

/* ─── Sidebar ───────────────────────────────── */

.sidebar {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    height: 100vh;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    position: sticky;
    top: 0;
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 20px 20px 24px;
    font-size: 16px;
    font-weight: 600;
    color: var(--accent-blue);
    border-bottom: 1px solid var(--border-color);
}

.sidebar-brand svg {
    flex-shrink: 0;
}

.sidebar-nav {
    flex: 1;
    padding: 12px 10px;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 400;
    transition: all var(--transition);
    cursor: pointer;
}

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

.sidebar-link.active {
    background: rgba(59, 130, 246, 0.1);
    color: var(--accent-blue);
    font-weight: 500;
}

.sidebar-link svg {
    flex-shrink: 0;
    opacity: 0.7;
}

.sidebar-link.active svg {
    opacity: 1;
}

.sidebar-footer {
    padding: 12px 10px;
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.sidebar-user {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 6px 8px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    flex: 1;
    transition: background var(--transition);
}

.sidebar-user:hover {
    background: var(--bg-hover);
}

.sidebar-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--accent-blue);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 600;
    flex-shrink: 0;
}

.sidebar-username {
    font-size: 13px;
    color: var(--text-secondary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.sidebar-logout {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 8px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    transition: all var(--transition);
}

.sidebar-logout:hover {
    color: var(--danger);
    background: rgba(239, 68, 68, 0.1);
}

/* ─── Main Area ─────────────────────────────── */

.main-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 24px;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-primary);
    min-height: 40px;
}

.topbar-left {
    display: flex;
    align-items: center;
    gap: 8px;
}

.topbar-back {
    background: none;
    border: none;
    color: var(--accent-blue);
    cursor: pointer;
    padding: 4px;
    display: flex;
    align-items: center;
    border-radius: 6px;
}

.topbar-back:active {
    background: var(--bg-hover);
}

.topbar-name {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
}

.page-content {
    flex: 1;
    padding: 2px;
    overflow-y: auto;
}

.page {
    animation: fadeIn 200ms ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ─── Stats Grid ────────────────────────────── */

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 16px;
    margin-bottom: 32px;
}

.stat-card {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 24px;
    transition: border-color var(--transition);
}

.stat-card:hover {
    border-color: var(--accent-blue);
}

.stat-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

.stat-icon-blue {
    background: rgba(59, 130, 246, 0.1);
    color: var(--accent-blue);
}

.stat-icon-green {
    background: rgba(16, 185, 129, 0.1);
    color: var(--accent-green);
}

.stat-icon-purple {
    background: rgba(139, 92, 246, 0.1);
    color: var(--accent-purple);
}

.stat-content {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.stat-value {
    font-size: 28px;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.stat-label {
    font-size: 13px;
    color: var(--text-secondary);
}

/* ─── Cards ─────────────────────────────────── */

.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
    gap: 16px;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    overflow: hidden;
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
}

.card-header h2 {
    font-size: 16px;
    font-weight: 600;
}

.card-header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.card-body {
    padding: 24px;
}

.placeholder-text {
    color: var(--text-muted);
    font-size: 14px;
    line-height: 1.6;
}

/* ─── Placeholder Section ───────────────────── */

.placeholder-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 80px 32px;
    min-height: 400px;
}

.placeholder-section h2 {
    font-size: 24px;
    font-weight: 600;
    margin: 20px 0 8px;
}

.placeholder-section .placeholder-text {
    max-width: 400px;
}

.placeholder-icon {
    color: var(--text-muted);
    opacity: 0.4;
}

/* ─── Misc ──────────────────────────────────── */

.text-muted {
    font-size: 12px;
    color: var(--text-muted);
}

.badge {
    font-size: 11px;
    padding: 3px 8px;
    background: var(--bg-hover);
    border-radius: 10px;
    color: var(--text-secondary);
    font-weight: 500;
}

/* ─── Responsive ────────────────────────────── */

/* ─── Mobile: hide sidebar, minimal topbar ──── */

@media (max-width: 768px) {
    .sidebar {
        display: none;
    }

    .topbar {
        padding: 12px 16px;
    }

    .topbar-title {
        font-size: 18px;
    }

    .page-content {
        padding: 12px;
    }

    .login-container {
        padding: 24px;
    }
    .stats-grid {
        grid-template-columns: 1fr;
    }
    .content-grid {
        grid-template-columns: 1fr;
    }
}