:root {
    /* Colors from web/index.css */
    --bg-primary: #0a0a1a;
    --bg-secondary: #0f0f23;
    --bg-card: rgba(22, 22, 48, 0.7);
    --text-primary: #f0f0f5;
    --text-secondary: #a0a0b8;
    --text-muted: #6a6a82;
    
    --accent: #f59e0b;
    --accent-light: #fbbf24;
    --accent-dark: #d97706;

    --border: rgba(255, 255, 255, 0.06);
    --border-accent: rgba(245, 158, 11, 0.3);

    /* Material 3 properties */
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-full: 9999px;
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

body {
    margin: 0;
    font-family: 'Inter', 'Noto Sans TC', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    display: flex;
    min-height: 100vh;
    line-height: 1.6;
}

.sidebar {
    width: 260px;
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--border);
    padding: 30px 0;
}

.sidebar h2 {
    margin: 0 0 30px 24px;
    color: var(--accent);
    font-weight: 800;
}

.nav-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.nav-links li {
    padding: 16px 24px;
    cursor: pointer;
    transition: var(--transition);
    border-left: 4px solid transparent;
    color: var(--text-secondary);
    font-weight: 500;
}

.nav-links li:hover {
    background-color: rgba(255, 255, 255, 0.03);
    color: var(--text-primary);
}

.nav-links li.active {
    background-color: rgba(245, 158, 11, 0.08); /* accent-glow */
    border-left-color: var(--accent);
    color: var(--accent-light);
    font-weight: 600;
}

.main-content {
    flex: 1;
    padding: 40px 60px;
    overflow-y: auto;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.4s var(--transition);
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

header {
    margin-bottom: 40px;
}

header h1 {
    margin: 0 0 8px 0;
    font-size: 2rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

header p {
    margin: 0;
    color: var(--text-secondary);
}

.card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 30px;
    margin-bottom: 30px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

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

.hidden {
    display: none !important;
}

/* FORM STYLES */
.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    margin-bottom: 10px;
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.form-group input[type="text"],
.form-group input[type="date"],
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    background: rgba(10, 10, 26, 0.6);
    border: 1px solid var(--border);
    color: var(--text-primary);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 1rem;
    box-sizing: border-box;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
    background: rgba(10, 10, 26, 0.8);
    box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.2);
}

.form-group input[type="checkbox"] {
    transform: scale(1.3);
    margin-top: 6px;
    accent-color: var(--accent);
}

.form-actions {
    display: flex;
    gap: 16px;
    margin-top: 30px;
}

small {
    display: block;
    margin-top: 8px;
    color: var(--text-muted);
}

code {
    background: rgba(245, 158, 11, 0.12);
    color: var(--accent-light);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: monospace;
}

/* BUTTONS */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    font-weight: 700;
    transition: var(--transition);
    font-family: inherit;
    font-size: 0.95rem;
}

.btn.primary {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
    color: var(--bg-primary);
    box-shadow: 0 4px 16px rgba(245, 158, 11, 0.3);
}

.btn.primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(245, 158, 11, 0.4);
}

.btn.primary:disabled {
    background: var(--text-muted);
    color: var(--bg-secondary);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn.secondary {
    background-color: transparent;
    border: 1.5px solid var(--border);
    color: var(--text-primary);
}

.btn.secondary:hover {
    border-color: rgba(255, 255, 255, 0.15);
    background: rgba(255, 255, 255, 0.04);
}

.btn.danger {
    background: rgba(248, 113, 113, 0.1);
    color: #f87171;
    border: 1px solid rgba(248, 113, 113, 0.2);
    padding: 8px 16px;
    border-radius: var(--radius-md);
    font-size: 0.85rem;
}

.btn.danger:hover {
    background: rgba(248, 113, 113, 0.2);
}

.btn.edit {
    background: rgba(96, 165, 250, 0.1);
    color: #60a5fa;
    border: 1px solid rgba(96, 165, 250, 0.2);
    padding: 8px 16px;
    border-radius: var(--radius-md);
    font-size: 0.85rem;
}

.btn.edit:hover {
    background: rgba(96, 165, 250, 0.2);
}

/* TABLE */
.table-container {
    overflow-x: auto;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    background: rgba(10, 10, 26, 0.4);
}

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    padding: 16px 20px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

th {
    color: var(--accent-light);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.05em;
    background: rgba(255, 255, 255, 0.02);
}

tr:last-child td {
    border-bottom: none;
}

tr:hover td {
    background: rgba(255, 255, 255, 0.02);
}

/* Status Message */
.status-message {
    margin-top: 20px;
    padding: 16px;
    border-radius: var(--radius-md);
    display: none;
    font-weight: 500;
}
.status-message.success {
    display: block;
    background: rgba(52, 211, 153, 0.1);
    color: #34d399;
    border: 1px solid rgba(52, 211, 153, 0.3);
}
.status-message.error {
    display: block;
    background: rgba(248, 113, 113, 0.1);
    color: #f87171;
    border: 1px solid rgba(248, 113, 113, 0.3);
}

/* EMAIL LAYOUT */
.email-layout {
    display: flex;
    gap: 30px;
    align-items: flex-start;
}

.email-form-card {
    flex: 1.2;
}

.email-preview-card {
    flex: 1;
    position: sticky;
    top: 30px;
}

.email-preview-card h3 {
    margin-top: 0;
    margin-bottom: 20px;
    color: var(--accent-light);
    font-size: 1.1rem;
}

.preview-box {
    background: #fcfcfc; /* Keep near white so email previews correctly */
    color: #333333;
    padding: 24px;
    border-radius: var(--radius-md);
    min-height: 250px;
    max-height: 600px;
    overflow-y: auto;
    border: 1px solid var(--border);
}

.text-muted {
    color: #999;
}