/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --bg: #f0fdf4;
    --surface: #ffffff;
    --sidebar-bg: #0f172a;
    --sidebar-text: #94a3b8;
    --sidebar-active: #10b981;
    --sidebar-hover: #1e293b;
    --primary: #059669;
    --primary-hover: #047857;
    --primary-light: #d1fae5;
    --danger: #dc2626;
    --danger-light: #fee2e2;
    --warning: #d97706;
    --warning-light: #fef3c7;
    --info: #2563eb;
    --info-light: #dbeafe;
    --text: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --shadow: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,.07), 0 2px 4px -2px rgba(0,0,0,.05);
    --radius: 10px;
    --radius-sm: 6px;
    --font-display: 'Outfit', sans-serif;
    --font-body: 'DM Sans', sans-serif;
    --sidebar-w: 260px;
}

html { font-size: 15px; }
body {
    font-family: var(--font-body);
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
    min-height: 100vh;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 600; }

/* ===== Layout ===== */
.layout { display: flex; min-height: 100vh; }

/* Sidebar */
.sidebar {
    width: var(--sidebar-w);
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    position: fixed;
    top: 0; left: 0; bottom: 0;
    display: flex;
    flex-direction: column;
    z-index: 100;
    transition: transform .3s ease;
}
.sidebar-brand {
    padding: 28px 24px 20px;
    border-bottom: 1px solid rgba(255,255,255,.06);
}
.sidebar-brand h1 {
    font-size: 1.25rem;
    color: #fff;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 10px;
}
.sidebar-brand h1 .icon {
    width: 36px; height: 36px;
    background: var(--primary);
    border-radius: 10px;
    display: flex; align-items: center; justify-content: center;
    font-size: 18px; color: #fff;
}
.sidebar-brand p { font-size: .78rem; color: var(--sidebar-text); margin-top: 4px; }

.sidebar-nav { flex: 1; padding: 16px 12px; overflow-y: auto; }
.sidebar-nav .nav-section {
    font-size: .7rem;
    text-transform: uppercase;
    letter-spacing: .08em;
    color: #475569;
    padding: 12px 12px 6px;
    font-weight: 600;
}
.sidebar-nav a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    border-radius: 8px;
    color: var(--sidebar-text);
    font-size: .92rem;
    transition: all .15s ease;
    text-decoration: none;
}
.sidebar-nav a:hover { background: var(--sidebar-hover); color: #e2e8f0; text-decoration: none; }
.sidebar-nav a.active { background: var(--sidebar-active); color: #fff; font-weight: 500; }
.sidebar-nav a i { font-size: 1.1rem; width: 20px; text-align: center; }

.sidebar-footer {
    padding: 16px 20px;
    border-top: 1px solid rgba(255,255,255,.06);
    font-size: .85rem;
    display: flex;
    align-items: center;
    gap: 8px;
}
.sidebar-footer a { color: var(--sidebar-text); margin-left: auto; }
.sidebar-footer a:hover { color: #fff; }

/* Main */
.main {
    flex: 1;
    margin-left: var(--sidebar-w);
    padding: 32px;
    min-height: 100vh;
}

/* Mobile */
.sidebar-toggle {
    display: none;
    position: fixed;
    top: 16px; left: 16px;
    z-index: 200;
    background: var(--sidebar-bg);
    color: #fff;
    border: none;
    border-radius: 8px;
    padding: 10px 14px;
    font-size: 1.2rem;
    cursor: pointer;
}
.overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,.4);
    z-index: 90;
}
.overlay.open { display: block; }

@media (max-width: 768px) {
    .sidebar { transform: translateX(-100%); }
    .sidebar.open { transform: translateX(0); }
    .sidebar-toggle { display: block; }
    .main { margin-left: 0; padding: 24px 16px; padding-top: 60px; }
}

/* ===== Cards ===== */
.card {
    background: var(--surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    overflow: hidden;
}
.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 24px;
    border-bottom: 1px solid var(--border);
}
.card-header h3 {
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 8px;
}
.card-body { padding: 24px; }
.card-body.no-pad { padding: 0; }

/* ===== Stats Grid ===== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 28px;
}
.stat-card {
    background: var(--surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    padding: 22px 24px;
    display: flex;
    align-items: center;
    gap: 18px;
}
.stat-icon {
    width: 52px; height: 52px;
    border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.5rem;
}
.stat-icon.blue { background: var(--info-light); color: var(--info); }
.stat-icon.green { background: var(--primary-light); color: var(--primary); }
.stat-icon.red { background: var(--danger-light); color: var(--danger); }
.stat-icon.gray { background: #f1f5f9; color: #64748b; }
.stat-info .num { font-size: 1.75rem; font-weight: 700; font-family: var(--font-display); }
.stat-info .label { font-size: .82rem; color: var(--text-muted); }

/* ===== Grid ===== */
.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-bottom: 24px;
}
@media (max-width: 900px) { .grid-2 { grid-template-columns: 1fr; } }

/* ===== Tables ===== */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border);
    font-size: .88rem;
}
th { font-weight: 600; color: var(--text-muted); font-size: .78rem; text-transform: uppercase; letter-spacing: .04em; }
tr:last-child td { border-bottom: none; }
tr:hover td { background: #f8fafc; }
.url-text { font-size: .78rem; color: var(--text-muted); word-break: break-all; }
.mono { font-family: 'DM Mono', monospace; }
.text-muted { color: var(--text-muted); }
.text-sm { font-size: .82rem; }

/* ===== Badges ===== */
.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: .72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .04em;
}
.badge.up, .badge.success { background: var(--primary-light); color: var(--primary); }
.badge.down, .badge.fail { background: var(--danger-light); color: var(--danger); }
.badge.unknown { background: #f1f5f9; color: #64748b; }

/* ===== Response Time ===== */
.response-time { font-weight: 500; }
.response-time.fast { color: var(--primary); }
.response-time.medium { color: var(--warning); }
.response-time.slow { color: var(--danger); }

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 18px;
    border-radius: var(--radius-sm);
    font-size: .88rem;
    font-weight: 500;
    border: none;
    cursor: pointer;
    transition: all .15s ease;
    text-decoration: none;
}
.btn:hover { text-decoration: none; }
.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: #b91c1c; }
.btn-outline { background: transparent; border: 1px solid var(--border); color: var(--text); }
.btn-outline:hover { background: #f8fafc; }
.btn-sm { padding: 6px 12px; font-size: .82rem; }
.btn-icon { padding: 8px; width: 36px; height: 36px; justify-content: center; }

/* ===== Forms ===== */
.form-group { margin-bottom: 18px; }
.form-group label {
    display: block;
    font-size: .85rem;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--text);
}
.form-group input, .form-group select, .form-group textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: .92rem;
    font-family: var(--font-body);
    transition: border-color .15s;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}
@media (max-width: 600px) { .form-row { grid-template-columns: 1fr; } }
.form-hint { font-size: .78rem; color: var(--text-muted); margin-top: 4px; }

/* ===== Checkbox ===== */
.checkbox-row {
    display: flex;
    align-items: center;
    gap: 8px;
}
.checkbox-row input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary);
}

/* ===== Channel List ===== */
.channel-list {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}
.channel-tag {
    display: inline-block;
    padding: 2px 8px;
    background: var(--primary-light);
    color: var(--primary);
    border-radius: 4px;
    font-size: .75rem;
}

/* ===== Empty State ===== */
.empty-state {
    text-align: center;
    padding: 48px 24px;
    color: var(--text-muted);
}
.empty-state i { font-size: 3rem; margin-bottom: 12px; display: block; }
.empty-state p { margin-bottom: 16px; }

/* ===== Page Header ===== */
.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 28px;
}
.page-header h1 { font-size: 1.5rem; }
.page-header .subtitle { color: var(--text-muted); font-size: .88rem; margin-top: 2px; }

/* ===== Flash Messages ===== */
.flash {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    margin-bottom: 20px;
    font-size: .88rem;
}
.flash.success { background: var(--primary-light); color: var(--primary); border: 1px solid #a7f3d0; }
.flash.error { background: var(--danger-light); color: var(--danger); border: 1px solid #fecaca; }
.flash.warning { background: var(--warning-light); color: var(--warning); border: 1px solid #fde68a; }
.flash.info { background: var(--info-light); color: var(--info); border: 1px solid #bfdbfe; }

/* ===== Toast ===== */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.toast {
    padding: 12px 20px;
    border-radius: var(--radius-sm);
    background: var(--surface);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border);
    font-size: .88rem;
    max-width: 320px;
}
.toast.success { border-left: 4px solid var(--primary); }
.toast.error { border-left: 4px solid var(--danger); }
.toast.info { border-left: 4px solid var(--info); }

/* ===== Login Page ===== */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg);
    padding: 20px;
}
.login-card {
    background: var(--surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border);
    padding: 40px;
    width: 100%;
    max-width: 400px;
}
.login-card .brand {
    text-align: center;
    margin-bottom: 32px;
}
.login-card .brand .icon {
    width: 60px; height: 60px;
    background: var(--primary);
    border-radius: 16px;
    display: inline-flex; align-items: center; justify-content: center;
    font-size: 28px; color: #fff;
    margin-bottom: 16px;
}
.login-card .brand h1 { font-size: 1.5rem; }
.login-card .brand p { color: var(--text-muted); margin-top: 4px; }

/* ===== Pagination ===== */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-top: 20px;
}
.pagination button {
    padding: 8px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--surface);
    cursor: pointer;
    font-size: .85rem;
}
.pagination button:hover { background: #f8fafc; }
.pagination button.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.pagination button:disabled { opacity: .5; cursor: not-allowed; }

/* ===== Loading ===== */
.loading {
    text-align: center;
    padding: 60px;
    color: var(--text-muted);
    font-size: 1rem;
}

/* ===== Actions ===== */
.actions {
    display: flex;
    gap: 8px;
    align-items: center;
}

/* ===== Spin Animation ===== */
@keyframes spin { from { transform: rotate(0); } to { transform: rotate(360deg); } }
.spin { animation: spin 1s linear infinite; }