/* ── CSS Variables (theme) ─────────────────────────────────────── */
:root {
    --bg-body: #f0f2f5;
    --bg-sidebar: #1e293b;
    --bg-card: #ffffff;
    --bg-input: #ffffff;
    --bg-hover: #f3f4f6;
    --bg-table-header: #f8fafc;
    --bg-table-row-hover: #fafbfc;
    --bg-notes: #fffbeb;
    --bg-empty: #ffffff;
    --bg-flash-success: #dcfce7;
    --bg-flash-error: #fee2e2;
    --text-primary: #1f2937;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --text-light: #94a3b8;
    --text-white: #ffffff;
    --border: #d1d5db;
    --border-light: #e2e8f0;
    --border-table: #f1f5f9;
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --danger: #dc2626;
    --danger-hover: #b91c1c;
    --warning: #f59e0b;
    --warning-hover: #d97706;
    --sidebar-text: #cbd5e1;
    --sidebar-text-hover: #ffffff;
    --sidebar-bg-hover: #334155;
    --sidebar-active: #2563eb;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --brand-color: #ffffff;
}

[data-theme="dark"] {
    --bg-body: #0f172a;
    --bg-sidebar: #0b1120;
    --bg-card: #1e293b;
    --bg-input: #1e293b;
    --bg-hover: #334155;
    --bg-table-header: #1e293b;
    --bg-table-row-hover: #1e293b;
    --bg-notes: #422006;
    --bg-empty: #1e293b;
    --bg-flash-success: #052e16;
    --bg-flash-error: #450a0a;
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --text-light: #64748b;
    --text-white: #ffffff;
    --border: #334155;
    --border-light: #334155;
    --border-table: #1e293b;
    --accent: #3b82f6;
    --accent-hover: #60a5fa;
    --danger: #ef4444;
    --danger-hover: #f87171;
    --warning: #f59e0b;
    --warning-hover: #fbbf24;
    --sidebar-text: #94a3b8;
    --sidebar-text-hover: #ffffff;
    --sidebar-bg-hover: #1e293b;
    --sidebar-active: #3b82f6;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
    --brand-color: #ffffff;
}

/* ── Reset & base ─────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
    height: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen,
                 Ubuntu, Cantarell, sans-serif;
    background: var(--bg-body);
    color: var(--text-primary);
    line-height: 1.6;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Layout: sidebar + main ──────────────────────────────────── */
.app-layout {
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* ── Sidebar ─────────────────────────────────────────────────── */
.sidebar {
    width: 240px;
    min-width: 240px;
    background: var(--bg-sidebar);
    color: var(--sidebar-text);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.sidebar-brand {
    padding: 1rem 1.25rem;
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--brand-color);
    border-bottom: 1px solid rgba(255,255,255,0.08);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.sidebar-brand:hover { text-decoration: none; color: var(--brand-color); }

/* ── Sidebar search ──────────────────────────────────────── */
.sidebar-search {
    padding: 0.5rem 0.75rem;
}

.sidebar-search form {
    position: relative;
}

.search-input {
    width: 100%;
    padding: 0.45rem 0.75rem;
    padding-right: 1.6rem;
    border-radius: 6px;
    border: 1px solid rgba(255,255,255,0.12);
    background: rgba(255,255,255,0.08);
    color: #fff;
    font-size: 0.85rem;
    font-family: inherit;
    outline: none;
    transition: border-color 0.15s, background 0.15s;
}
.search-input::placeholder {
    color: rgba(255,255,255,0.4);
}
.search-input:focus {
    border-color: var(--accent);
    background: rgba(255,255,255,0.12);
}

.search-spinner {
    display: none;
    position: absolute;
    right: 0.6rem;
    top: 50%;
    transform: translateY(-50%);
    width: 14px;
    height: 14px;
    border: 2px solid rgba(255,255,255,0.15);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}
@keyframes spin { to { transform: translateY(-50%) rotate(360deg); } }

.sidebar-section-title {
    padding: 1rem 1.25rem 0.4rem;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-light);
    font-weight: 600;
}

.sidebar-categories {
    flex: 1;
    overflow-y: auto;
    padding: 0.25rem 0.5rem 0.5rem;
}

.sidebar-cat-btn {
    display: block;
    width: 100%;
    padding: 0.5rem 0.75rem;
    margin-bottom: 2px;
    border-radius: 6px;
    font-size: 0.9rem;
    color: var(--sidebar-text);
    background: transparent;
    border: none;
    cursor: pointer;
    text-align: left;
    transition: background 0.12s, color 0.12s;
    font-family: inherit;
    line-height: 1.4;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.sidebar-cat-btn:hover {
    background: var(--sidebar-bg-hover);
    color: var(--sidebar-text-hover);
    text-decoration: none;
}
.sidebar-cat-btn.active {
    background: var(--sidebar-active);
    color: #fff;
    font-weight: 600;
}

.sidebar-cat-btn .count {
    float: right;
    background: rgba(255,255,255,0.12);
    padding: 0.05rem 0.45rem;
    border-radius: 999px;
    font-size: 0.75rem;
}
.sidebar-cat-btn.active .count {
    background: rgba(255,255,255,0.2);
}

.sidebar-actions {
    padding: 0.5rem 0.75rem;
    border-top: 1px solid rgba(255,255,255,0.08);
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.sidebar-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    width: 100%;
    padding: 0.5rem 0.75rem;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--sidebar-text);
    background: transparent;
    border: 1px dashed rgba(255,255,255,0.15);
    cursor: pointer;
    text-align: left;
    transition: background 0.12s, color 0.12s, border-color 0.12s;
    font-family: inherit;
    line-height: 1.4;
}
.sidebar-btn:hover {
    background: var(--sidebar-bg-hover);
    color: var(--sidebar-text-hover);
    border-color: rgba(255,255,255,0.3);
    text-decoration: none;
}
.sidebar-btn.primary {
    border-style: solid;
    border-color: var(--accent);
    color: var(--accent);
}
.sidebar-btn.primary:hover {
    background: var(--accent);
    color: #fff;
}

/* ── Theme toggle ────────────────────────────────────────────── */
.sidebar-footer {
    padding: 0.75rem;
    border-top: 1px solid rgba(255,255,255,0.08);
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.sidebar-user {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.3rem 0.75rem;
    font-size: 0.8rem;
    color: var(--sidebar-text);
}
.user-avatar { font-size: 1rem; }
.user-name {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.sidebar-logout {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    width: 100%;
    padding: 0.45rem 0.75rem;
    border-radius: 6px;
    font-size: 0.8rem;
    color: var(--sidebar-text);
    text-decoration: none;
    transition: background 0.12s, color 0.12s;
}
.sidebar-logout:hover {
    background: rgba(239,68,68,0.15);
    color: #ef4444;
    text-decoration: none;
}

.theme-toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    width: 100%;
    padding: 0.45rem 0.75rem;
    border-radius: 6px;
    font-size: 0.8rem;
    color: var(--sidebar-text);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: background 0.12s, color 0.12s;
    font-family: inherit;
    line-height: 1.4;
}
.theme-toggle:hover {
    background: var(--sidebar-bg-hover);
    color: var(--sidebar-text-hover);
}

/* ── Main content area ───────────────────────────────────────── */
.main-content {
    flex: 1;
    overflow-y: auto;
    padding: 1.5rem 2rem;
    min-width: 0;
}

/* ── Flash messages ──────────────────────────────────────────── */
.flash {
    padding: 0.75rem 1rem;
    border-radius: 6px;
    margin-bottom: 1rem;
    font-weight: 500;
}
.flash.success {
    background: var(--bg-flash-success);
    color: var(--text-primary);
    border: 1px solid var(--border);
}
.flash.error {
    background: var(--bg-flash-error);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

/* ── Auth pages (full screen, no sidebar) ────────────────────── */
.auth-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: var(--bg-body);
}

.auth-form {
    width: 100%;
    max-width: 400px;
    margin: 0 1rem;
    background: var(--bg-card);
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
}

.auth-form h2 {
    margin-bottom: 1.5rem;
    text-align: center;
    font-size: 1.4rem;
    color: var(--text-primary);
}

.auth-link {
    margin-top: 1.25rem;
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* ── Forms (generic) ─────────────────────────────────────────── */
form label {
    display: block;
    margin-top: 1rem;
    margin-bottom: 0.25rem;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-primary);
}

form input[type="text"],
form input[type="password"],
form textarea,
form select {
    width: 100%;
    padding: 0.6rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 1rem;
    background: var(--bg-input);
    color: var(--text-primary);
    transition: border-color 0.15s;
}
form input:focus, form textarea:focus, form select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(37,99,235,0.15);
}

form textarea { resize: vertical; }

.form-row {
    display: flex;
    gap: 1rem;
}
.form-row .form-group { flex: 1; }

.form-actions {
    margin-top: 1.5rem;
    display: flex;
    gap: 0.75rem;
}

.form-page {
    max-width: 640px;
    background: var(--bg-card);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
}
.form-page h2 { margin-bottom: 0.5rem; color: var(--text-primary); }

/* ── Buttons ─────────────────────────────────────────────────── */
.btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 500;
    border: 1px solid var(--border);
    background: var(--bg-card);
    color: var(--text-primary);
    cursor: pointer;
    text-decoration: none;
    transition: background 0.15s, border-color 0.15s;
    font-family: inherit;
    line-height: 1.4;
}
.btn:hover { background: var(--bg-hover); text-decoration: none; }
.btn-primary {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}
.btn-primary:hover { background: var(--accent-hover); }
.btn-danger {
    background: var(--danger);
    color: #fff;
    border-color: var(--danger);
}
.btn-danger:hover { background: var(--danger-hover); }
.btn-small {
    padding: 0.3rem 0.6rem;
    font-size: 0.8rem;
}
.btn-note {
    background: var(--warning);
    color: #fff;
    border-color: var(--warning);
}
.btn-note:hover { background: var(--warning-hover); }

.cat-badge {
    display: inline-block;
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    font-size: 0.78rem;
    background: var(--accent);
    color: #fff;
    font-weight: 500;
    white-space: nowrap;
}
.cat-badge:hover { background: var(--accent-hover); text-decoration: none; }

/* ── Page header (main content) ──────────────────────────────── */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}
.page-header h2 { font-size: 1.5rem; color: var(--text-primary); }

/* ── Empty state ─────────────────────────────────────────────── */
.empty {
    text-align: center;
    color: var(--text-secondary);
    padding: 3rem 1rem;
    background: var(--bg-empty);
    border-radius: 12px;
    border: 2px dashed var(--border);
}
.empty a { color: var(--accent); font-weight: 500; }

/* ── Breadcrumb ──────────────────────────────────────────────── */
.breadcrumb {
    font-size: 0.9rem;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}
.breadcrumb a { color: var(--accent); }

/* ── Contact table ───────────────────────────────────────────── */
.contact-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-card);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.contact-table th {
    background: var(--bg-table-header);
    text-align: left;
    padding: 0.75rem 0.75rem;
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    border-bottom: 2px solid var(--border-light);
}

.contact-table td {
    padding: 0.7rem 0.75rem;
    border-bottom: 1px solid var(--border-table);
    color: var(--text-primary);
}

.contact-table tbody tr:hover { background: var(--bg-table-row-hover); }

.actions-cell {
    white-space: nowrap;
    display: flex;
    gap: 0.35rem;
    align-items: center;
}

.notes-row td {
    background: var(--bg-notes);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ── Welcome / index page ────────────────────────────────────── */
.welcome-card {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 2.5rem;
    box-shadow: var(--shadow-sm);
    text-align: center;
}
.welcome-card h2 {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}
.welcome-card p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}
.welcome-stats {
    display: flex;
    gap: 2rem;
    justify-content: center;
    margin-top: 1.5rem;
}
.stat {
    text-align: center;
}
.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent);
}
.stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 0.15rem;
}

/* ── Mobile responsive ───────────────────────────────────────── */
@media (max-width: 768px) {
    .sidebar {
        width: 200px;
        min-width: 200px;
    }
    .main-content {
        padding: 1rem;
    }
    .contact-table th:nth-child(4),
    .contact-table td:nth-child(4),
    .contact-table th:nth-child(6),
    .contact-table td:nth-child(6) {
        display: none;
    }
    .welcome-stats {
        flex-direction: column;
        gap: 1rem;
    }
}