/* ── CSS Custom Properties ─────────────────────────────── */
:root {
    --font-sans: 'DM Sans', system-ui, -apple-system, sans-serif;
    --font-mono: 'DM Mono', 'SF Mono', 'Fira Code', monospace;
    --radius: 12px;
    --radius-sm: 8px;
    --transition: 200ms ease;

    /* Light theme */
    --bg: #f8fafc;
    --bg-card: #ffffff;
    --bg-sidebar: #0f172a;
    --text: #0f172a;
    --text-muted: #64748b;
    --text-sidebar: #cbd5e1;
    --text-sidebar-active: #ffffff;
    --border: #e2e8f0;
    --accent: #25D366;
    --accent-hover: #1fb855;
    --danger: #ef4444;
    --danger-hover: #dc2626;
    --warning: #f59e0b;
    --success: #22c55e;
    --sidebar-w: 260px;
    --topbar-h: 64px;
}

/* Dark theme */
.theme-dark {
    --bg: #0f172a;
    --bg-card: #1e293b;
    --bg-sidebar: #020617;
    --text: #f1f5f9;
    --text-muted: #94a3b8;
    --text-sidebar: #94a3b8;
    --text-sidebar-active: #ffffff;
    --border: #334155;
}

/* ── Reset ─────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; -webkit-font-smoothing: antialiased; }
body { font-family: var(--font-sans); background: var(--bg); color: var(--text); line-height: 1.6; min-height: 100vh; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img, svg { display: block; }
table { width: 100%; border-collapse: collapse; }
th { text-align: left; font-weight: 600; font-size: 0.8rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; padding: 12px 16px; border-bottom: 1px solid var(--border); }
td { padding: 10px 16px; border-bottom: 1px solid var(--border); font-size: 0.875rem; }
tr:last-child td { border-bottom: none; }

/* ── Icons ─────────────────────────────────────────────── */
.icon { width: 20px; height: 20px; flex-shrink: 0; }
.icon-lg { width: 32px; height: 32px; }

/* ── Auth Shell ────────────────────────────────────────── */
.auth-shell { display: flex; align-items: center; justify-content: center; min-height: 100vh; padding: 2rem; position: relative; }
.auth-gradient { position: absolute; inset: 0; background: radial-gradient(ellipse at 50% 0%, rgba(37,211,102,0.12) 0%, transparent 60%); pointer-events: none; }
.auth-stage { width: 100%; max-width: 420px; position: relative; z-index: 1; }
.auth-card { background: var(--bg-card); border-radius: var(--radius); padding: 2.5rem; box-shadow: 0 1px 3px rgba(0,0,0,0.08), 0 4px 16px rgba(0,0,0,0.04); border: 1px solid var(--border); }
.auth-card-header { text-align: center; margin-bottom: 2rem; }
.auth-logo { margin-bottom: 1rem; display: flex; justify-content: center; }
.auth-title { font-size: 1.5rem; font-weight: 700; color: var(--text); }
.auth-subtitle { font-size: 0.875rem; color: var(--text-muted); margin-top: 0.25rem; }
.auth-form { display: flex; flex-direction: column; gap: 1.25rem; }
.toast-stack { position: fixed; top: 1rem; right: 1rem; z-index: 9999; display: flex; flex-direction: column; gap: 0.5rem; max-width: 380px; }
.auth-toast-stack { top: 1rem; right: 1rem; }

/* ── Brand Mark ────────────────────────────────────────── */
.brand-mark { display: inline-flex; align-items: center; justify-content: center; width: 40px; height: 40px; border-radius: var(--radius-sm); background: var(--accent); color: #fff; font-weight: 800; font-size: 1rem; letter-spacing: -0.5px; }
.brand-mark-lg { width: 56px; height: 56px; font-size: 1.35rem; border-radius: var(--radius); }
.brand-mark-xl { width: 72px; height: 72px; font-size: 1.75rem; border-radius: var(--radius); }

/* ── Sidebar ───────────────────────────────────────────── */
.sidebar-backdrop { position: fixed; inset: 0; background: rgba(0,0,0,0.4); z-index: 90; display: none; }
.sidebar { position: fixed; top: 0; left: 0; bottom: 0; width: var(--sidebar-w); background: var(--bg-sidebar); color: var(--text-sidebar); z-index: 100; display: flex; flex-direction: column; overflow-y: auto; }
.sidebar-brand { display: flex; align-items: center; justify-content: space-between; padding: 1.25rem; border-bottom: 1px solid rgba(255,255,255,0.06); }
.sidebar-brand-link { display: flex; align-items: center; gap: 0.75rem; color: inherit; text-decoration: none; }
.sidebar-brand-link:hover { text-decoration: none; }
.sidebar-logo { flex-shrink: 0; }
.sidebar-eyebrow { font-size: 0.65rem; text-transform: uppercase; letter-spacing: 0.1em; opacity: 0.5; }
.sidebar-brand-copy h1 { font-size: 1rem; font-weight: 700; color: var(--text-sidebar-active); }
.sidebar-brand-note { font-size: 0.7rem; opacity: 0.4; margin-top: 2px; }
.sidebar-close { display: none; background: none; border: none; color: inherit; cursor: pointer; padding: 4px; }
.sidebar-footer { padding: 1rem 1.25rem; border-top: 1px solid rgba(255,255,255,0.06); margin-top: auto; }
.sidebar-meta { font-size: 0.675rem; opacity: 0.4; line-height: 1.6; }

/* Sidebar Nav */
.sidebar-nav { padding: 0.75rem; flex: 1; display: flex; flex-direction: column; gap: 2px; }
.nav-link { display: flex; align-items: center; gap: 0.625rem; padding: 0.625rem 0.75rem; border-radius: var(--radius-sm); color: var(--text-sidebar); text-decoration: none; font-size: 0.875rem; font-weight: 500; transition: all var(--transition); border: none; background: none; width: 100%; cursor: pointer; }
.nav-link:hover { background: rgba(255,255,255,0.06); color: var(--text-sidebar-active); text-decoration: none; }
.nav-link.active { background: rgba(37,211,102,0.15); color: var(--accent); }
.nav-link-parent { justify-content: space-between; }
.nav-link-main { display: flex; align-items: center; gap: 0.625rem; }
.nav-chevron { transition: transform var(--transition); flex-shrink: 0; }
.nav-group.active .nav-chevron { transform: rotate(180deg); }
.nav-submenu { display: none; padding-left: 1.75rem; margin: 2px 0 4px; flex-direction: column; gap: 1px; }
.nav-group.active .nav-submenu { display: flex; }
.nav-sublink { display: flex; align-items: center; gap: 0.5rem; padding: 0.5rem 0.75rem; border-radius: var(--radius-sm); color: var(--text-sidebar); text-decoration: none; font-size: 0.8125rem; transition: all var(--transition); }
.nav-sublink:hover { background: rgba(255,255,255,0.06); color: var(--text-sidebar-active); text-decoration: none; }
.nav-sublink.active { background: rgba(37,211,102,0.12); color: var(--accent); font-weight: 600; }

/* ── Main Shell ────────────────────────────────────────── */
.app-shell { display: flex; min-height: 100vh; }
.main-shell { flex: 1; margin-left: var(--sidebar-w); display: flex; flex-direction: column; min-width: 0; }

/* ── Topbar ────────────────────────────────────────────── */
.topbar { height: var(--topbar-h); display: flex; align-items: center; justify-content: space-between; padding: 0 2rem; background: var(--bg-card); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 50; gap: 1rem; }
.topbar-title-group { display: flex; align-items: center; gap: 0.75rem; min-width: 0; }
.sidebar-toggle { display: none; background: none; border: none; color: var(--text); cursor: pointer; padding: 6px; border-radius: var(--radius-sm); }
.sidebar-toggle:hover { background: var(--border); }
.topbar-eyebrow { font-size: 0.675rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-muted); }
.topbar-title-group h2 { font-size: 1.125rem; font-weight: 700; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.topbar-actions { display: flex; align-items: center; gap: 0.75rem; flex-shrink: 0; }
.user-menu { display: flex; align-items: center; gap: 0.5rem; }
.user-avatar { width: 32px; height: 32px; border-radius: 50%; background: var(--accent); color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 0.75rem; flex-shrink: 0; }
.user-name { font-size: 0.8125rem; font-weight: 500; display: none; }
.theme-switch { background: none; border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 6px 8px; cursor: pointer; color: var(--text); display: flex; align-items: center; }
.theme-switch:hover { background: var(--border); }

/* ── Content ───────────────────────────────────────────── */
.content-shell { flex: 1; padding: 2rem; max-width: 1280px; width: 100%; }

/* ── Page Header ───────────────────────────────────────── */
.page-header { display: flex; align-items: flex-start; justify-content: space-between; gap: 1rem; margin-bottom: 1.5rem; flex-wrap: wrap; }
.page-heading { display: flex; align-items: flex-start; gap: 0.75rem; min-width: 0; }
.page-icon { padding: 0.5rem; background: rgba(37,211,102,0.1); border-radius: var(--radius-sm); color: var(--accent); }
.eyebrow { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-muted); margin-bottom: 0.125rem; }
.page-title { font-size: 1.5rem; font-weight: 700; }
.page-copy .muted { font-size: 0.8125rem; color: var(--text-muted); margin-top: 0.25rem; }
.page-header-actions { display: flex; gap: 0.5rem; flex-shrink: 0; }

/* ── Panels / Cards ────────────────────────────────────── */
.panel { background: var(--bg-card); border-radius: var(--radius); border: 1px solid var(--border); margin-bottom: 1.5rem; overflow: hidden; }
.panel-head { display: flex; align-items: center; justify-content: space-between; padding: 1rem 1.25rem; border-bottom: 1px solid var(--border); gap: 0.75rem; }
.panel-title { font-size: 0.9375rem; font-weight: 600; }
.panel-body { padding: 1.25rem; }

/* ── Summary Grid ──────────────────────────────────────── */
.summary-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1rem; margin-bottom: 1.5rem; }
.summary-card { background: var(--bg-card); border-radius: var(--radius); border: 1px solid var(--border); padding: 1.25rem; }
.summary-card-header { display: flex; align-items: flex-start; justify-content: space-between; }
.summary-card-title { font-size: 0.75rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 0.25rem; }
.summary-card-value { font-size: 1.75rem; font-weight: 700; }
.summary-card-icon { width: 40px; height: 40px; border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; }
.summary-card-icon-green { background: rgba(37,211,102,0.12); color: var(--accent); }
.summary-card-icon-blue { background: rgba(59,130,246,0.12); color: #3b82f6; }
.summary-card-icon-purple { background: rgba(139,92,246,0.12); color: #8b5cf6; }
.summary-card-icon-orange { background: rgba(245,158,11,0.12); color: #f59e0b; }

/* ── Dashboard Grid ────────────────────────────────────── */
.dashboard-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; margin-bottom: 1.5rem; }

/* ── Buttons ───────────────────────────────────────────── */
.button { display: inline-flex; align-items: center; gap: 0.5rem; padding: 0.625rem 1.25rem; border-radius: var(--radius-sm); font-family: var(--font-sans); font-size: 0.875rem; font-weight: 600; border: 1px solid transparent; cursor: pointer; transition: all var(--transition); text-decoration: none; white-space: nowrap; }
.button:hover { text-decoration: none; }
.button-primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.button-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.button-secondary { background: transparent; color: var(--text); border-color: var(--border); }
.button-secondary:hover { background: var(--border); }
.button-danger { background: transparent; color: var(--danger); border-color: var(--border); }
.button-danger:hover { background: var(--danger); color: #fff; border-color: var(--danger); }
.button-text { background: none; border: none; color: var(--text-muted); cursor: pointer; padding: 4px; display: flex; align-items: center; }
.button-text:hover { color: var(--text); }
.button-icon { background: none; border: none; color: var(--text-muted); cursor: pointer; padding: 4px; display: flex; align-items: center; border-radius: var(--radius-sm); }
.button-icon:hover { background: var(--border); color: var(--text); }
.button-sm { padding: 0.375rem 0.75rem; font-size: 0.75rem; }
.button-lg { padding: 0.75rem 1.75rem; font-size: 1rem; }
.button-full { width: 100%; justify-content: center; }

/* ── Forms ─────────────────────────────────────────────── */
.field { display: flex; flex-direction: column; gap: 0.375rem; }
.field-label { font-size: 0.8125rem; font-weight: 600; color: var(--text); }
.field-input-wrap { position: relative; display: flex; align-items: center; }
.field-icon { position: absolute; left: 0.75rem; color: var(--text-muted); pointer-events: none; }
.field-input { width: 100%; padding: 0.625rem 0.875rem; border: 1px solid var(--border); border-radius: var(--radius-sm); font-family: var(--font-sans); font-size: 0.875rem; background: var(--bg-card); color: var(--text); transition: border-color var(--transition); }
.field-input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(37,211,102,0.1); }
.field-icon + .field-input { padding-left: 2.5rem; }
textarea.field-input { resize: vertical; min-height: 80px; }
select.field-input { cursor: pointer; }

/* ── Tables ────────────────────────────────────────────── */
.table-wrap { overflow-x: auto; }
.cell-mono { font-family: var(--font-mono); font-size: 0.75rem; }
.cell-nowrap { white-space: nowrap; }
.cell-truncate { max-width: 250px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.empty-cell { text-align: center; color: var(--text-muted); padding: 2rem 1rem !important; }
.muted { color: var(--text-muted); }

/* ── Badges ────────────────────────────────────────────── */
.badge { display: inline-flex; align-items: center; padding: 0.125rem 0.5rem; border-radius: 999px; font-size: 0.7rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.03em; }
.badge-success { background: rgba(34,197,94,0.12); color: var(--success); }
.badge-error { background: rgba(239,68,68,0.12); color: var(--danger); }
.badge-neutral { background: rgba(100,116,139,0.1); color: var(--text-muted); }

/* ── Status Dot ────────────────────────────────────────── */
.status-dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }
.status-online { background: var(--accent); box-shadow: 0 0 6px rgba(37,211,102,0.4); animation: pulse 2s infinite; }
.status-offline { background: #94a3b8; }
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* ── Modals ────────────────────────────────────────────── */
.modal { display: none; position: fixed; inset: 0; z-index: 200; align-items: center; justify-content: center; padding: 1rem; }
.modal.open { display: flex; }
.modal-backdrop { position: absolute; inset: 0; background: rgba(0,0,0,0.5); }
.modal-content { position: relative; background: var(--bg-card); border-radius: var(--radius); border: 1px solid var(--border); width: 100%; max-width: 520px; max-height: 90vh; overflow-y: auto; box-shadow: 0 20px 60px rgba(0,0,0,0.2); }
.modal-sm { max-width: 400px; }
.modal-header { display: flex; align-items: center; justify-content: space-between; padding: 1.25rem; border-bottom: 1px solid var(--border); }
.modal-title { font-size: 1.0625rem; font-weight: 700; }
.modal-body { padding: 1.25rem; }

/* ── Toasts ────────────────────────────────────────────── */
.toast-item { display: flex; align-items: flex-start; gap: 0.75rem; padding: 1rem; background: var(--bg-card); border-radius: var(--radius-sm); border: 1px solid var(--border); box-shadow: 0 4px 12px rgba(0,0,0,0.1); animation: slideIn 300ms ease; }
@keyframes slideIn { from { opacity: 0; transform: translateX(20px); } to { opacity: 1; transform: translateX(0); } }
.toast-icon { flex-shrink: 0; }
.toast-copy { flex: 1; min-width: 0; }
.toast-title { font-size: 0.75rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; }
.toast-message { font-size: 0.8125rem; color: var(--text-muted); }
.toast-close { background: none; border: none; color: var(--text-muted); cursor: pointer; padding: 2px; flex-shrink: 0; }
.toast-error .toast-title { color: var(--danger); }
.toast-success .toast-title { color: var(--success); }

/* ── Device Grid ───────────────────────────────────────── */
.device-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 1rem; }
.device-card { padding: 1.25rem; }
.device-card-header { display: flex; align-items: flex-start; justify-content: space-between; margin-bottom: 0.75rem; }
.device-card-name { font-size: 1rem; font-weight: 700; }
.device-card-session { font-size: 0.75rem; color: var(--text-muted); }
.device-card-body { margin-bottom: 0.75rem; }
.device-card-info { display: flex; gap: 0.5rem; font-size: 0.8125rem; margin-bottom: 0.25rem; }
.device-card-actions { display: flex; gap: 0.375rem; flex-wrap: wrap; padding-top: 0.75rem; border-top: 1px solid var(--border); }

/* ── Tabs ──────────────────────────────────────────────── */
.tab-row { display: flex; gap: 0; border-bottom: 2px solid var(--border); }
.tab-item { padding: 0.5rem 1rem; font-size: 0.8125rem; font-weight: 600; color: var(--text-muted); border-bottom: 2px solid transparent; margin-bottom: -2px; transition: all var(--transition); text-decoration: none; }
.tab-item:hover { color: var(--text); text-decoration: none; }
.tab-active { color: var(--accent); border-bottom-color: var(--accent); }

/* ── Filters ───────────────────────────────────────────── */
.filter-row { display: flex; align-items: flex-end; gap: 1rem; flex-wrap: wrap; }
.filter-row .field { min-width: 150px; }

/* ── Info List ─────────────────────────────────────────── */
.info-list { display: flex; flex-direction: column; gap: 0; }
.info-row { display: flex; padding: 0.625rem 0; border-bottom: 1px solid var(--border); font-size: 0.875rem; }
.info-row:last-child { border-bottom: none; }
.info-row dt { width: 140px; flex-shrink: 0; color: var(--text-muted); font-weight: 500; }
.info-row dd { flex: 1; }

/* ── Checkbox Grid ─────────────────────────────────────── */
.checkbox-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 0.5rem; }
.checkbox-item { display: flex; align-items: center; gap: 0.5rem; font-size: 0.875rem; cursor: pointer; }
.checkbox-item input[type="checkbox"] { width: 16px; height: 16px; accent-color: var(--accent); cursor: pointer; }

/* ── Empty State ───────────────────────────────────────── */
.empty-state { text-align: center; padding: 3rem 2rem; }
.empty-state-icon { display: flex; justify-content: center; margin-bottom: 1rem; color: var(--text-muted); }
.empty-state-title { font-size: 1.125rem; font-weight: 600; margin-bottom: 0.5rem; }
.empty-state-text { color: var(--text-muted); font-size: 0.875rem; }
.empty-state-text + .empty-state-text { margin-top: 0.25rem; }

/* ── Quick Actions ─────────────────────────────────────── */
.quick-actions { display: flex; gap: 0.75rem; }

/* ── Landing ───────────────────────────────────────────── */
.landing-hero { text-align: center; padding: 4rem 2rem 3rem; }
.landing-hero-content { max-width: 640px; margin: 0 auto; }
.landing-logo { display: flex; justify-content: center; margin-bottom: 1.5rem; }
.landing-title { font-size: 2.5rem; font-weight: 800; letter-spacing: -1px; margin-bottom: 0.5rem; }
.landing-subtitle { font-size: 1.125rem; color: var(--accent); font-weight: 600; margin-bottom: 1rem; }
.landing-description { font-size: 0.9375rem; color: var(--text-muted); max-width: 480px; margin: 0 auto 2rem; line-height: 1.7; }
.landing-actions { display: flex; gap: 0.75rem; justify-content: center; }
.landing-features { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1.5rem; max-width: 900px; margin: 0 auto; padding: 0 2rem 3rem; }
.feature-card { background: var(--bg-card); border-radius: var(--radius); border: 1px solid var(--border); padding: 2rem; text-align: center; }
.feature-icon { display: flex; justify-content: center; margin-bottom: 1rem; color: var(--accent); }
.feature-title { font-size: 1.0625rem; font-weight: 700; margin-bottom: 0.5rem; }
.feature-text { font-size: 0.875rem; color: var(--text-muted); line-height: 1.6; }
.landing-stats { display: flex; justify-content: center; gap: 3rem; padding: 2rem; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.landing-stat { text-align: center; }
.landing-stat-value { display: block; font-size: 2rem; font-weight: 800; color: var(--accent); }
.landing-stat-label { font-size: 0.75rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; }
.landing-footer { text-align: center; padding: 2rem; }
.landing-footer p { font-size: 0.75rem; color: var(--text-muted); }

/* ── Docs ──────────────────────────────────────────────── */
.docs-content { max-width: 860px; }
.docs-section { margin-bottom: 1.5rem; }
.docs-body { font-size: 0.875rem; line-height: 1.7; }
.docs-body p { margin-bottom: 0.75rem; }
.docs-body h4 { font-size: 0.9375rem; font-weight: 700; margin: 1.25rem 0 0.5rem; color: var(--accent); }
.docs-code { background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 1rem; overflow-x: auto; margin-bottom: 1rem; }
.docs-code code { font-family: var(--font-mono); font-size: 0.75rem; line-height: 1.7; white-space: pre; color: var(--text); }
.docs-code strong { color: var(--accent); }
.docs-code em { color: var(--text-muted); font-style: italic; }

/* ── Helpers ───────────────────────────────────────────── */
.mt-3 { margin-top: 1rem; }
.inline-form { display: inline; }

/* ── QR Loading ────────────────────────────────────────── */
.qr-loading { text-align: center; padding: 2rem; color: var(--text-muted); }
.qr-image { display: block; max-width: 100%; height: auto; margin: 0 auto; }

/* ── Responsive ────────────────────────────────────────── */
@media (max-width: 1024px) {
    .dashboard-grid { grid-template-columns: 1fr; }
    .sidebar { transform: translateX(-100%); }
    .sidebar.open { transform: translateX(0); }
    .sidebar-backdrop.show { display: block; }
    .sidebar-close { display: block; }
    .sidebar-toggle { display: flex; }
    .main-shell { margin-left: 0; }
}
@media (max-width: 768px) {
    .topbar { padding: 0 1rem; }
    .content-shell { padding: 1rem; }
    .page-header { flex-direction: column; }
    .summary-grid { grid-template-columns: 1fr 1fr; }
    .device-grid { grid-template-columns: 1fr; }
    .landing-stats { gap: 1.5rem; }
    .topbar-actions .user-name { display: none; }
    .user-menu .button-text { display: none; }
}
@media (max-width: 480px) {
    .summary-grid { grid-template-columns: 1fr; }
    .filter-row { flex-direction: column; }
    .filter-row .field { width: 100%; }
}
@media (min-width: 769px) {
    .user-name { display: inline; }
}