:root {
    --bg: #f8f9fa;
    --card: #fff;
    --border: #dee2e6;
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --danger: #dc3545;
    --success: #198754;
    --warning: #ffc107;
    --muted: #6c757d;
    --text: #212529;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    font-size: 14px;
}

/* Nav */
nav {
    background: var(--text);
    padding: 0 24px;
    display: flex;
    align-items: center;
    height: 52px;
    gap: 32px;
}
nav .brand { color: #fff; font-weight: 700; font-size: 16px; text-decoration: none; }
nav a { color: #adb5bd; text-decoration: none; font-size: 14px; padding: 4px 0; }
nav a:hover, nav a.active { color: #fff; }
nav .spacer { flex: 1; }

/* Layout */
.container { max-width: 1100px; margin: 24px auto; padding: 0 16px; }

/* Cards */
.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 24px;
    margin-bottom: 20px;
}
.card h2 { font-size: 18px; margin-bottom: 16px; }

/* Tables */
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--border); font-size: 13px; }
th { font-weight: 600; color: var(--muted); font-size: 11px; text-transform: uppercase; letter-spacing: 0.5px; }
tr:hover { background: #f1f3f5; }

/* Badges */
.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 600;
}
.badge-active { background: #d1fae5; color: #065f46; }
.badge-replied { background: #dbeafe; color: #1e40af; }
.badge-completed { background: #e5e7eb; color: #374151; }
.badge-bounced { background: #fee2e2; color: #991b1b; }
.badge-unsubscribed { background: #fef3c7; color: #92400e; }
.badge-sent { background: #ede9fe; color: #5b21b6; }
.badge-opened { background: #fce7f3; color: #9d174d; }

/* Buttons */
.btn {
    display: inline-block;
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
    border: none;
    cursor: pointer;
    text-decoration: none;
    line-height: 1.4;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #bb2d3b; }
.btn-outline { background: transparent; border: 1px solid var(--border); color: var(--text); }
.btn-outline:hover { background: #e9ecef; }
.btn-sm { padding: 4px 10px; font-size: 12px; }

/* Forms */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-weight: 500; margin-bottom: 4px; font-size: 13px; }
.form-control {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 14px;
    font-family: inherit;
}
.form-control:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37,99,235,0.1); }
textarea.form-control { min-height: 120px; resize: vertical; }
select.form-control { appearance: auto; }
.form-row { display: flex; gap: 16px; }
.form-row .form-group { flex: 1; }
.form-inline { display: flex; gap: 8px; align-items: end; }

/* Flash messages */
.flash { padding: 12px 16px; border-radius: 6px; margin-bottom: 16px; font-size: 13px; }
.flash-success { background: #d1fae5; color: #065f46; }
.flash-error { background: #fee2e2; color: #991b1b; }

/* Stats grid */
.stats-grid { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 24px; }
.stat-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px 16px;
    text-align: center;
    flex: 1 1 0;
    min-width: 100px;
}
.stat-card .number { font-size: 24px; font-weight: 700; color: var(--primary); }
.stat-card .label { font-size: 10px; color: var(--muted); text-transform: uppercase; margin-top: 2px; }
/* Stat card status colors */
.stat-total { background: #eff6ff; border-left: 3px solid var(--primary); }
.stat-total .number { color: var(--primary); }
.stat-active { background: #d1fae5; border-left: 3px solid #065f46; }
.stat-active .number { color: #065f46; }
.stat-replied { background: #dbeafe; border-left: 3px solid #1e40af; }
.stat-replied .number { color: #1e40af; }
.stat-completed { background: #e5e7eb; border-left: 3px solid #374151; }
.stat-completed .number { color: #374151; }
.stat-bounced { background: #fee2e2; border-left: 3px solid #991b1b; }
.stat-bounced .number { color: #991b1b; }
.stat-unsubscribed { background: #fef3c7; border-left: 3px solid #92400e; }
.stat-unsubscribed .number { color: #92400e; }
.stat-sent { background: #ede9fe; border-left: 3px solid #5b21b6; }
.stat-sent .number { color: #5b21b6; }
.stat-opened { background: #fce7f3; border-left: 3px solid #9d174d; }
.stat-opened .number { color: #9d174d; }

.stat-filter { cursor: pointer; transition: border-color 0.15s, box-shadow 0.15s; }
.stat-filter:hover { border-color: var(--primary); }
.stat-filter-active { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37,99,235,0.15); }

/* Sequence step editor */
.step-row {
    display: flex;
    gap: 12px;
    align-items: start;
    padding: 16px;
    background: var(--bg);
    border-radius: 6px;
    margin-bottom: 8px;
}
.step-row .step-num {
    font-weight: 700;
    color: var(--primary);
    min-width: 30px;
    padding-top: 8px;
}
.step-row .step-fields { flex: 1; }
.step-row .step-fields .form-group { margin-bottom: 8px; }

/* Header bar */
.page-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; }
.page-header h1 { font-size: 22px; }

/* Sequence step preview */
.step-preview { background: var(--bg); border-radius: 6px; padding: 16px; margin-bottom: 8px; }
.step-preview-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.step-preview-num { font-weight: 700; color: var(--primary); font-size: 13px; }
.step-preview-delay { font-size: 12px; color: var(--muted); }
.step-preview-subject { font-weight: 600; font-size: 14px; margin-bottom: 8px; }
.step-preview-body { font-size: 13px; color: #555; line-height: 1.5; white-space: pre-wrap; word-wrap: break-word; max-height: 150px; overflow-y: auto; padding: 10px; background: #fff; border: 1px solid var(--border); border-radius: 4px; }

/* Sequence detail step columns */
.step-col-header { text-align: center; }
.step-cell { text-align: center; }
.step-pending { color: var(--muted); font-size: 12px; }

/* Empty state */
.empty { text-align: center; padding: 48px 0; color: var(--muted); }