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

:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --success: #16a34a;
    --danger: #dc2626;
    --warning: #d97706;
    --info: #0891b2;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-500: #6b7280;
    --gray-700: #374151;
    --gray-900: #111827;
    --radius: 10px;
    --shadow: 0 1px 3px rgba(0,0,0,.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--gray-100);
    color: var(--gray-900);
    font-size: 15px;
    line-height: 1.5;
    -webkit-text-size-adjust: 100%;
}

/* Header */
.app-header {
    background: var(--primary);
    color: #fff;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 8px rgba(0,0,0,.15);
}
.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
}
.app-title { font-size: 20px; font-weight: 700; }
.nav-toggle { font-size: 24px; cursor: pointer; user-select: none; }
.main-nav {
    display: none;
    flex-direction: column;
    background: var(--primary-dark);
    padding: 8px 0;
}
.main-nav.open { display: flex; }
.main-nav a {
    color: #fff;
    text-decoration: none;
    padding: 12px 20px;
    font-size: 15px;
    border-bottom: 1px solid rgba(255,255,255,.1);
}
.main-nav a.active { background: rgba(255,255,255,.15); font-weight: 600; }
.main-nav a:hover { background: rgba(255,255,255,.1); }
.nav-logout { color: #fca5a5 !important; }

/* Container */
.container { padding: 16px; max-width: 600px; margin: 0 auto; }
.page-title { font-size: 20px; margin-bottom: 16px; color: var(--gray-700); }

/* Status Banner */
.status-banner {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    border-radius: var(--radius);
    margin-bottom: 16px;
    font-weight: 600;
    font-size: 16px;
}
.status-active { background: #dcfce7; color: #166534; border: 1px solid #86efac; }
.status-inactive { background: #fee2e2; color: #991b1b; border: 1px solid #fca5a5; }
.status-icon { font-size: 24px; }

/* Cards */
.info-card, .card {
    background: #fff;
    border-radius: var(--radius);
    padding: 14px;
    margin-bottom: 12px;
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-200);
}
.info-row { display: flex; justify-content: space-between; padding: 6px 0; border-bottom: 1px solid var(--gray-100); font-size: 14px; }
.info-row:last-child { border-bottom: none; }
.info-label { color: var(--gray-500); font-weight: 500; }

.card-active { border-left: 4px solid var(--success); }
.card-disabled { opacity: .6; }
.card-header { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-bottom: 6px; }
.card-body { font-size: 14px; }
.card-preview { color: var(--gray-500); margin-top: 4px; font-size: 13px; }
.card-actions { display: flex; gap: 6px; margin-top: 10px; flex-wrap: wrap; }

/* Stats Grid */
.stats-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 16px; }
.stat-card { background: #fff; border-radius: var(--radius); padding: 14px; text-align: center; box-shadow: var(--shadow); border: 1px solid var(--gray-200); }
.stat-number { font-size: 28px; font-weight: 700; color: var(--gray-700); }
.stat-label { font-size: 12px; color: var(--gray-500); text-transform: uppercase; margin-top: 2px; }
.stat-success .stat-number { color: var(--success); }
.stat-warning .stat-number { color: var(--warning); }
.stat-danger .stat-number { color: var(--danger); }

/* Buttons */
.btn {
    display: inline-block;
    padding: 10px 16px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    text-decoration: none;
    border: none;
    cursor: pointer;
    text-align: center;
    transition: opacity .2s;
}
.btn:hover { opacity: .85; }
.btn-full { display: block; width: 100%; margin-bottom: 8px; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-secondary { background: var(--gray-200); color: var(--gray-700); }
.btn-success { background: var(--success); color: #fff; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-sm { padding: 6px 10px; font-size: 12px; }
.action-buttons { margin-top: 16px; }

/* Forms */
.form-section { background: #fff; border-radius: var(--radius); padding: 16px; margin-bottom: 16px; box-shadow: var(--shadow); border: 1px solid var(--gray-200); }
.form-section h3 { font-size: 16px; margin-bottom: 12px; color: var(--gray-700); }
.form-section h4 { font-size: 14px; margin: 14px 0 8px; color: var(--gray-500); }
.form-group { margin-bottom: 12px; }
.form-group label { display: block; font-size: 13px; font-weight: 500; color: var(--gray-500); margin-bottom: 4px; }
.form-group input, .form-group select, .form-group textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--gray-300);
    border-radius: 8px;
    font-size: 15px;
    font-family: inherit;
    background: var(--gray-50);
    -webkit-appearance: none;
}
.form-group textarea { resize: vertical; min-height: 80px; }
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37,99,235,.1);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }

/* Alerts */
.alert { padding: 12px 14px; border-radius: 8px; margin-bottom: 14px; font-size: 14px; }
.alert-success { background: #dcfce7; color: #166534; border: 1px solid #86efac; }
.alert-error { background: #fee2e2; color: #991b1b; border: 1px solid #fca5a5; }
.alert-warning { background: #fef3c7; color: #92400e; border: 1px solid #fcd34d; }
.alert-info { background: #e0f2fe; color: #075985; border: 1px solid #7dd3fc; }

/* Badges */
.badge { display: inline-block; padding: 2px 8px; border-radius: 12px; font-size: 11px; font-weight: 600; }
.badge-success { background: #dcfce7; color: #166534; }
.badge-warning { background: #fef3c7; color: #92400e; }
.badge-danger { background: #fee2e2; color: #991b1b; }
.badge-info { background: #e0f2fe; color: #075985; }
.badge-secondary { background: var(--gray-200); color: var(--gray-700); }

/* Log */
.log-list { margin-top: 12px; }
.log-entry { background: #fff; border-radius: 8px; padding: 12px; margin-bottom: 8px; box-shadow: var(--shadow); border: 1px solid var(--gray-200); cursor: pointer; }
.log-header { display: flex; align-items: center; gap: 8px; }
.log-time { font-size: 12px; color: var(--gray-500); min-width: 70px; }
.log-sender { flex: 1; font-size: 14px; font-weight: 500; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.log-status-badge { font-size: 14px; }
.log-subject { font-size: 13px; color: var(--gray-500); margin-top: 4px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.log-details { margin-top: 10px; padding-top: 10px; border-top: 1px solid var(--gray-200); font-size: 13px; }
.log-details div { margin-bottom: 4px; }
.log-summary { font-size: 13px; color: var(--gray-500); margin-bottom: 8px; }

/* Pagination */
.pagination { display: flex; align-items: center; justify-content: center; gap: 12px; margin-top: 16px; padding: 12px; }
.page-info { font-size: 14px; color: var(--gray-500); }

/* Preview */
.preview-box { background: var(--gray-50); border: 1px solid var(--gray-200); border-radius: 8px; padding: 14px; font-size: 14px; }
.preview-subject { margin-bottom: 10px; padding-bottom: 8px; border-bottom: 1px solid var(--gray-200); }
.preview-signature { margin-top: 12px; padding-top: 10px; border-top: 1px solid var(--gray-200); color: var(--gray-500); }
.preview-contact { margin-top: 8px; font-size: 13px; color: var(--gray-500); }

/* Login */
.login-page { display: flex; align-items: center; justify-content: center; min-height: 100vh; padding: 20px; background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%); }
.login-box { background: #fff; border-radius: 16px; padding: 32px 24px; width: 100%; max-width: 360px; box-shadow: 0 20px 60px rgba(0,0,0,.2); text-align: center; }
.login-box h1 { font-size: 28px; margin-bottom: 4px; }
.login-subtitle { color: var(--gray-500); margin-bottom: 24px; }

/* Utilities */
.hidden { display: none !important; }
.text-muted { color: var(--gray-500); }
.text-danger { color: var(--danger); }

/* Filter form */
.filter-form { margin-bottom: 12px; }

/* Desktop */
@media (min-width: 768px) {
    .nav-toggle { display: none; }
    .main-nav { display: flex !important; flex-direction: row; padding: 0 16px; }
    .main-nav a { padding: 10px 14px; border-bottom: none; font-size: 14px; border-radius: 6px; }
    .container { padding: 24px; }
    .stats-grid { grid-template-columns: repeat(4, 1fr); }
}