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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: #f1f5f9;
    color: #1e293b;
    line-height: 1.5;
    min-height: 100vh;
}

/* ── Nav ── */
nav {
    background: #1e293b;
    display: flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0 1.5rem;
    height: 56px;
    position: sticky;
    top: 0;
    z-index: 10;
    box-shadow: 0 1px 3px rgba(0,0,0,0.3);
}
.nav-brand {
    font-weight: 700;
    font-size: 1.1rem;
    color: #fff;
    letter-spacing: -0.02em;
    margin-right: 1.5rem;
}
.nav-brand span { color: #818cf8; }
nav a {
    color: #94a3b8;
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    padding: 0.375rem 0.75rem;
    border-radius: 6px;
    transition: background 0.15s, color 0.15s;
}
nav a:hover { color: #fff; background: rgba(255,255,255,0.08); }
nav a.active { color: #fff; background: rgba(99,102,241,0.3); }

/* ── Layout ── */
main { padding: 2rem; max-width: 1200px; margin: 0 auto; }

/* ── Page header ── */
.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
}
.page-header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: #0f172a;
}

/* ── Cards ── */
.card {
    background: #fff;
    border-radius: 10px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.07), 0 1px 2px rgba(0,0,0,0.05);
    overflow: hidden;
}
.card-body { padding: 1.5rem; }

/* ── Stats ── */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}
.stat-card {
    background: #fff;
    border-radius: 10px;
    padding: 1.25rem 1.5rem;
    box-shadow: 0 1px 3px rgba(0,0,0,0.07);
    border-left: 4px solid #6366f1;
}
.stat-card .stat-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #64748b;
}
.stat-card .stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: #1e293b;
    line-height: 1.2;
    margin-top: 0.25rem;
}

/* ── Buttons ── */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: 6px;
    border: none;
    cursor: pointer;
    text-decoration: none;
    transition: opacity 0.15s, box-shadow 0.15s;
    white-space: nowrap;
}
.btn:hover { opacity: 0.88; }
.btn-primary { background: #6366f1; color: #fff; box-shadow: 0 1px 2px rgba(99,102,241,0.3); }
.btn-secondary { background: #f1f5f9; color: #475569; border: 1px solid #e2e8f0; }
.btn-danger { background: #ef4444; color: #fff; }
.btn-sm { padding: 0.3rem 0.65rem; font-size: 0.8rem; }

/* ── Table ── */
.table-wrapper { overflow-x: auto; }
table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}
thead th {
    background: #f8fafc;
    color: #475569;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid #e2e8f0;
    white-space: nowrap;
}
tbody tr { border-bottom: 1px solid #f1f5f9; transition: background 0.1s; }
tbody tr:last-child { border-bottom: none; }
tbody tr:hover { background: #f8fafc; }
tbody td {
    padding: 0.75rem 1rem;
    color: #334155;
    vertical-align: middle;
}
.td-actions { display: flex; gap: 0.5rem; align-items: center; }

/* ── Status badges ── */
.badge {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: capitalize;
}
.badge-active  { background: #dcfce7; color: #16a34a; }
.badge-paused  { background: #fef9c3; color: #ca8a04; }
.badge-done    { background: #f1f5f9; color: #64748b; }
.badge-open    { background: #dbeafe; color: #2563eb; }
.badge-closed  { background: #f1f5f9; color: #64748b; }
.badge-sent    { background: #dcfce7; color: #16a34a; }
.badge-pending { background: #fef3c7; color: #d97706; }

/* ── Forms ── */
.form-card { max-width: 560px; }
.form-group { margin-bottom: 1.25rem; }
.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: #374151;
    margin-bottom: 0.4rem;
}
.form-group input[type="text"],
.form-group input[type="password"],
.form-group input[type="date"],
.form-group input[type="datetime-local"],
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.5rem 0.75rem;
    font-size: 0.875rem;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    background: #fff;
    color: #1e293b;
    transition: border-color 0.15s, box-shadow 0.15s;
    outline: none;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus,
.form-group input[type="password"]:focus {
    border-color: #6366f1;
    box-shadow: 0 0 0 3px rgba(99,102,241,0.15);
}
.form-actions { display: flex; gap: 0.75rem; align-items: center; margin-top: 1.5rem; }

/* ── Table sorting & filtering ── */
.sort-link {
    color: inherit;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    white-space: nowrap;
}
.sort-link:hover { color: #6366f1; }
.sort-link.sort-active { color: #6366f1; }
.sort-indicator { font-size: 0.7rem; opacity: 0.8; }

.table-filters {
    padding: 0.65rem 1rem;
    border-bottom: 1px solid #e2e8f0;
    background: #f8fafc;
}
.filters-form {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    flex-wrap: wrap;
}
.filter-input {
    padding: 0.35rem 0.65rem;
    font-size: 0.8rem;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    background: #fff;
    color: #1e293b;
    outline: none;
    transition: border-color 0.15s, box-shadow 0.15s;
    min-width: 200px;
}
.filter-input:focus {
    border-color: #6366f1;
    box-shadow: 0 0 0 3px rgba(99,102,241,0.15);
}
.filter-select {
    padding: 0.35rem 0.65rem;
    font-size: 0.8rem;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    background: #fff;
    color: #1e293b;
    outline: none;
    cursor: pointer;
    transition: border-color 0.15s;
}
.filter-select:focus { border-color: #6366f1; }

/* ── Detail page ── */
.back-link {
    display: inline-block;
    font-size: 0.8rem;
    color: #64748b;
    text-decoration: none;
    margin-bottom: 0.3rem;
}
.back-link:hover { color: #6366f1; }
.page-header-left { display: flex; flex-direction: column; }
.detail-info { margin-bottom: 1.5rem; }
.detail-grid {
    display: grid;
    grid-template-columns: 110px 1fr;
    gap: 0.5rem 1rem;
    font-size: 0.875rem;
}
.detail-grid dt {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #64748b;
    padding-top: 0.1rem;
}
.detail-grid dd { color: #1e293b; }
.section-subheader { margin-top: 1.75rem; }
.section-title { font-size: 1.1rem; font-weight: 700; color: #0f172a; }
.detail-section { margin-bottom: 1.5rem; }

/* ── Nav toggle (hamburger) — hidden on desktop ── */
.nav-toggle { display: none; }
.nav-links { display: contents; }

/* ── Responsive: smartphones ── */
@media (max-width: 640px) {
    nav {
        flex-wrap: wrap;
        height: auto;
        padding: 0 1rem;
    }
    .nav-brand {
        flex: 1;
        padding: 0.875rem 0;
        margin-right: 0;
    }
    .nav-toggle {
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 5px;
        width: 40px;
        height: 40px;
        background: none;
        border: none;
        cursor: pointer;
        border-radius: 6px;
        align-self: center;
    }
    .nav-toggle:hover { background: rgba(255,255,255,0.08); }
    .nav-toggle span {
        display: block;
        width: 18px;
        height: 2px;
        background: #94a3b8;
        border-radius: 2px;
    }
    .nav-links {
        display: none;
        flex-direction: column;
        width: 100%;
        padding-bottom: 0.75rem;
        gap: 0.125rem;
    }
    nav.nav-open .nav-links { display: flex; }
    .nav-links a { padding: 0.625rem 0.75rem; }
    .nav-logout { margin-left: 0 !important; padding-top: 0.25rem; }

    main { padding: 1rem; }
    .page-header { flex-wrap: wrap; gap: 0.75rem; }
    .form-card { max-width: 100%; }
    .col-hide-sm { display: none; }

    /* Filter bar */
    .filters-form { flex-direction: column; align-items: stretch; }
    .filter-input { min-width: 0; width: 100%; }
    .filter-select { width: 100%; }

    /* Tighter table cells */
    thead th { padding: 0.6rem 0.75rem; }
    tbody td { padding: 0.6rem 0.75rem; font-size: 0.8rem; }
    .td-actions { flex-wrap: wrap; }
}