:root {
    --bg: #f4f6f8;
    --panel: #ffffff;
    --border: #dfe3e8;
    --text: #22303c;
    --muted: #6b7885;
    --primary: #2b6cb0;
    --primary-dark: #245a91;
    --danger: #c53030;
    --success: #2f855a;
    --warning: #b7791f;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    font-size: 15px;
    line-height: 1.5;
}

.container {
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 16px;
}

/* Header */
.app-header {
    background: #1f3c56;
    color: #fff;
}

.header-inner {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    padding-top: 12px;
    padding-bottom: 12px;
}

.brand {
    font-size: 20px;
    font-weight: 700;
}

.nav {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
}

.nav-link {
    background: transparent;
    border: 0;
    color: #cfe0ef;
    padding: 8px 12px;
    border-radius: 4px;
    font: inherit;
    cursor: pointer;
    text-decoration: none;
}

.nav-link:hover { background: rgba(255, 255, 255, .12); color: #fff; }
.nav-link.active { background: #fff; color: #1f3c56; font-weight: 600; }

main { padding: 24px 16px 48px; min-height: 70vh; }

h1 { font-size: 24px; margin: 0 0 16px; }
h2 { font-size: 17px; margin: 0 0 12px; }
h3 { font-size: 15px; margin: 16px 0 8px; }

.view-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 16px;
}

.view-head h1 { margin: 0; }

.hidden { display: none !important; }

/* Stats */
.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 16px;
}

.stat-card .label { color: var(--muted); font-size: 13px; text-transform: uppercase; letter-spacing: .04em; }
.stat-card .value { font-size: 30px; font-weight: 700; margin-top: 4px; }

.panel-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 16px;
}

.panel {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 16px;
}

/* Lists */
.item-list { list-style: none; margin: 0; padding: 0; }

.item-list li {
    padding: 10px 0;
    border-bottom: 1px solid var(--border);
}

.item-list li:last-child { border-bottom: 0; }

.item-title { font-weight: 600; }
.item-meta { color: var(--muted); font-size: 13px; }

/* Tables */
.table-wrap {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 6px;
    overflow-x: auto;
}

table { width: 100%; border-collapse: collapse; min-width: 640px; }

th, td {
    text-align: left;
    padding: 10px 12px;
    border-bottom: 1px solid var(--border);
    vertical-align: middle;
}

th {
    background: #eef2f6;
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: .03em;
    color: var(--muted);
}

tbody tr:last-child td { border-bottom: 0; }
tbody tr:hover { background: #f8fafc; }

tr.due-soon { background: #fffbea; }
tr.due-soon:hover { background: #fff6d8; }
tr.overdue { background: #fdecec; }
tr.overdue:hover { background: #fbdede; }

/* Buttons */
.btn {
    background: #fff;
    border: 1px solid var(--border);
    color: var(--text);
    padding: 7px 12px;
    border-radius: 4px;
    font: inherit;
    cursor: pointer;
}

.btn:hover { background: #f0f3f6; }
.btn-primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-danger { color: var(--danger); border-color: #f0c2c2; }
.btn-danger:hover { background: #fdecec; }
.btn-sm { padding: 4px 8px; font-size: 13px; }
.btn-link { background: none; border: 0; color: var(--primary); cursor: pointer; padding: 0 0 12px; font: inherit; }
.btn[disabled] { opacity: .6; cursor: not-allowed; }

.actions { display: flex; gap: 6px; flex-wrap: wrap; }

/* Badges */
.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
    border: 1px solid transparent;
}

.badge-scheduled { background: #e6f0fa; color: var(--primary); border-color: #c6ddf2; }
.badge-completed { background: #e6f4ec; color: var(--success); border-color: #c2e2d1; }
.badge-cancelled { background: #f2f3f5; color: var(--muted); border-color: #dfe3e8; }
.badge-due { background: #fdf3d7; color: var(--warning); border-color: #f0dfae; }
.badge-overdue { background: #fdecec; color: var(--danger); border-color: #f3c9c9; }

/* Messages */
.loading, .empty {
    padding: 16px;
    color: var(--muted);
    background: var(--panel);
    border: 1px dashed var(--border);
    border-radius: 6px;
}

.error-box {
    padding: 12px 16px;
    background: #fdecec;
    border: 1px solid #f3c9c9;
    color: var(--danger);
    border-radius: 6px;
}

.toast {
    position: fixed;
    top: 16px;
    right: 16px;
    z-index: 60;
    padding: 12px 16px;
    border-radius: 6px;
    color: #fff;
    box-shadow: 0 6px 18px rgba(0, 0, 0, .18);
    max-width: 320px;
}

.toast-success { background: var(--success); }
.toast-error { background: var(--danger); }
.toast-info { background: var(--primary); }

/* Filters */
.filter-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 12px;
}

.filter-bar label { color: var(--muted); font-size: 14px; }

/* Forms */
input, select, textarea {
    width: 100%;
    padding: 8px 10px;
    border: 1px solid var(--border);
    border-radius: 4px;
    font: inherit;
    background: #fff;
    color: var(--text);
}

.filter-bar select { width: auto; min-width: 180px; }

textarea { resize: vertical; }

.form-field { margin-bottom: 12px; flex: 1; }
.form-field label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 4px; }
.form-row { display: flex; gap: 12px; flex-wrap: wrap; }
.form-row > .form-field { min-width: 200px; }

.form-error {
    background: #fdecec;
    border: 1px solid #f3c9c9;
    color: var(--danger);
    padding: 10px 12px;
    border-radius: 4px;
    margin-bottom: 12px;
    font-size: 14px;
}

/* Modal */
.modal {
    position: fixed;
    inset: 0;
    background: rgba(20, 30, 40, .55);
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding: 24px 16px;
    overflow-y: auto;
    z-index: 50;
}

.modal-card {
    background: #fff;
    border-radius: 8px;
    padding: 20px;
    width: 100%;
    max-width: 560px;
    box-shadow: 0 12px 32px rgba(0, 0, 0, .25);
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    margin-top: 16px;
}

/* Detail */
.detail-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 12px;
    margin-bottom: 20px;
}

.detail-grid .label { color: var(--muted); font-size: 13px; }
.detail-grid .value { font-weight: 600; }

.app-footer {
    padding: 16px;
    color: var(--muted);
    font-size: 13px;
    border-top: 1px solid var(--border);
    background: #fff;
}

@media (max-width: 640px) {
    .view-head { flex-direction: column; align-items: flex-start; }
    .brand { font-size: 18px; }
}