:root {
    --ark-ink: #0b1020;
    --ark-ink-2: #1f2547;
    --ark-muted: #64748b;
    --ark-soft: #f8fafc;
    --ark-surface: #ffffff;
    --ark-surface-2: #f8fafc;
    --ark-border: #e2e8f0;
    --ark-border-strong: #cbd5e1;
    --ark-primary: #6366f1;
    --ark-primary-dark: #4f46e5;
    --ark-accent: #8b5cf6;
    --ark-success: #10b981;
    --ark-warn: #f59e0b;
    --ark-danger: #ef4444;
    --ark-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #ec4899 100%);
    --ark-card-shadow: 0 1px 2px rgba(15, 23, 42, .04), 0 8px 24px -12px rgba(11, 16, 32, .12);
    --ark-card-shadow-hover: 0 4px 8px rgba(15, 23, 42, .06), 0 18px 36px -14px rgba(11, 16, 32, .18);
    --ark-nav-bg: rgba(255, 255, 255, .85);
    --ark-bg-radial-a: rgba(99, 102, 241, .08);
    --ark-bg-radial-b: rgba(236, 72, 153, .07);
    --ark-input-bg: #ffffff;
    --ark-input-placeholder: #94a3b8;
    --ark-code-bg: #0b1020;
    --ark-code-fg: #e2e8f0;
    --ark-row-alt: #fafbff;
    --ark-row-hover: #eef2ff;
    --ark-chip-bg: #eef2ff;
    --ark-chip-fg: #4f46e5;
    color-scheme: light;
}

[data-theme="dark"] {
    --ark-ink: #e2e8f0;
    --ark-ink-2: #cbd5e1;
    --ark-muted: #94a3b8;
    --ark-soft: #060912;
    --ark-surface: #111729;
    --ark-surface-2: #0b1020;
    --ark-border: #1f2547;
    --ark-border-strong: #2a3358;
    --ark-card-shadow: 0 1px 2px rgba(0, 0, 0, .35), 0 12px 30px -16px rgba(0, 0, 0, .6);
    --ark-card-shadow-hover: 0 4px 10px rgba(0, 0, 0, .4), 0 22px 44px -16px rgba(0, 0, 0, .7);
    --ark-nav-bg: rgba(17, 23, 41, .75);
    --ark-bg-radial-a: rgba(99, 102, 241, .18);
    --ark-bg-radial-b: rgba(139, 92, 246, .14);
    --ark-input-bg: #0e1426;
    --ark-input-placeholder: #5b6480;
    --ark-row-alt: #0e1426;
    --ark-row-hover: #1a2240;
    --ark-chip-bg: rgba(99, 102, 241, .18);
    --ark-chip-fg: #c7d2fe;
    color-scheme: dark;
}

html, body { min-height: 100%; }
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--ark-ink);
    background:
        radial-gradient(1200px 600px at -10% -10%, var(--ark-bg-radial-a), transparent 60%),
        radial-gradient(900px 500px at 110% 0%, var(--ark-bg-radial-b), transparent 60%),
        var(--ark-soft);
    margin: 0;
    padding-bottom: 60px;
    font-feature-settings: 'cv11', 'ss01';
    transition: background-color .25s ease, color .25s ease;
}

/* ===== Navigation ===== */
.navbar.ark-nav {
    background: var(--ark-nav-bg);
    backdrop-filter: saturate(180%) blur(12px);
    -webkit-backdrop-filter: saturate(180%) blur(12px);
    border-bottom: 1px solid var(--ark-border);
    box-shadow: 0 1px 2px rgba(15, 23, 42, .03);
}
.ark-brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.15rem;
    color: var(--ark-ink) !important;
    letter-spacing: -.01em;
}
.ark-brand .ark-logo {
    width: 34px; height: 34px;
    background: var(--ark-gradient);
    border-radius: 9px;
    display: inline-flex;
    align-items: center; justify-content: center;
    color: #fff;
    box-shadow: 0 6px 18px -8px rgba(99, 102, 241, .65);
}
.ark-brand .ark-logo svg { width: 18px; height: 18px; }
.ark-nav .nav-link {
    color: var(--ark-ink-2) !important;
    font-weight: 500;
    border-radius: 8px;
    padding: 6px 12px !important;
    transition: background .15s ease, color .15s ease;
}
.ark-nav .nav-link:hover { background: var(--ark-chip-bg); color: var(--ark-primary-dark) !important; }
.ark-nav .nav-link.active { background: var(--ark-chip-bg); color: var(--ark-primary-dark) !important; }
[data-theme="dark"] .ark-nav .nav-link:hover,
[data-theme="dark"] .ark-nav .nav-link.active { color: #c7d2fe !important; }
.ark-nav .navbar-text { color: var(--ark-muted); }
.btn-link.nav-logout { color: var(--ark-muted) !important; text-decoration: none; font-weight: 500; }

/* Theme toggle */
.theme-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 10px;
    border: 1px solid var(--ark-border);
    background: var(--ark-surface);
    color: var(--ark-ink-2);
    transition: background .15s ease, color .15s ease, border-color .15s ease;
}
.theme-toggle:hover { background: var(--ark-chip-bg); color: var(--ark-primary-dark); border-color: var(--ark-border-strong); }
.theme-toggle svg { width: 18px; height: 18px; }
.theme-icon-sun { display: none; }
.theme-icon-moon { display: inline; }
[data-theme="dark"] .theme-icon-sun { display: inline; }
[data-theme="dark"] .theme-icon-moon { display: none; }

/* ===== Hero ===== */
.ark-hero {
    background: var(--ark-gradient);
    color: #fff;
    border-radius: 24px;
    padding: 56px 48px;
    position: relative;
    overflow: hidden;
    box-shadow: 0 24px 60px -24px rgba(99, 102, 241, .55);
}
.ark-hero::before {
    content: '';
    position: absolute; inset: 0;
    background:
        radial-gradient(400px 200px at 90% 0%, rgba(255, 255, 255, .25), transparent 60%),
        radial-gradient(500px 250px at 0% 100%, rgba(255, 255, 255, .12), transparent 60%);
    pointer-events: none;
}
.ark-hero h1 {
    font-weight: 800;
    letter-spacing: -.02em;
    font-size: clamp(2rem, 3.8vw, 3.4rem);
    line-height: 1.05;
    margin-bottom: 18px;
}
.ark-hero p.lead { font-size: 1.1rem; opacity: .92; max-width: 56ch; }
.ark-hero .badge-pill {
    display: inline-flex; align-items: center; gap: 6px;
    background: rgba(255, 255, 255, .15);
    border: 1px solid rgba(255, 255, 255, .25);
    border-radius: 999px;
    padding: 4px 12px;
    font-size: .8rem;
    margin-bottom: 16px;
}

/* ===== Cards ===== */
.ark-card {
    background: var(--ark-surface);
    border: 1px solid var(--ark-border);
    border-radius: 14px;
    box-shadow: var(--ark-card-shadow);
    transition: box-shadow .2s ease, transform .2s ease, background-color .25s ease, border-color .25s ease;
    color: var(--ark-ink);
}
.ark-card:hover { box-shadow: var(--ark-card-shadow-hover); }
.ark-card > .card-header,
.ark-card .ark-card-header {
    background: transparent;
    border-bottom: 1px solid var(--ark-border);
    padding: 16px 20px;
    font-weight: 600;
    letter-spacing: -.005em;
    color: var(--ark-ink);
}
.ark-card > .card-body, .ark-card .ark-card-body { padding: 20px; color: var(--ark-ink); }

.ark-stat {
    background: var(--ark-surface);
    border: 1px solid var(--ark-border);
    border-radius: 14px;
    padding: 18px 20px;
    position: relative;
    overflow: hidden;
    color: var(--ark-ink);
}
.ark-stat .label { color: var(--ark-muted); font-size: .8rem; text-transform: uppercase; letter-spacing: .06em; font-weight: 600; }
.ark-stat .value { font-size: 1.85rem; font-weight: 700; letter-spacing: -.02em; margin-top: 4px; }
.ark-stat .spark {
    position: absolute; right: 16px; top: 16px;
    width: 38px; height: 38px;
    background: var(--ark-chip-bg);
    color: var(--ark-chip-fg);
    border-radius: 10px;
    display: inline-flex; align-items: center; justify-content: center;
}

/* ===== Forms / Inputs ===== */
.form-control, .form-select {
    border-radius: 10px;
    border-color: var(--ark-border);
    padding: 10px 12px;
    background-color: var(--ark-input-bg);
    color: var(--ark-ink);
}
.form-control::placeholder { color: var(--ark-input-placeholder); }
.form-control:focus, .form-select:focus {
    border-color: var(--ark-primary);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, .15);
    background-color: var(--ark-input-bg);
    color: var(--ark-ink);
}
.form-label { font-weight: 500; color: var(--ark-ink-2); font-size: .9rem; }
.input-group .form-control[readonly] { background-color: var(--ark-input-bg); color: var(--ark-ink); }

/* ===== Buttons ===== */
.btn { border-radius: 10px; padding: 8px 16px; font-weight: 500; transition: transform .05s ease, box-shadow .15s ease; }
.btn:active { transform: translateY(1px); }
.btn-primary {
    background: var(--ark-primary);
    border-color: var(--ark-primary);
    box-shadow: 0 4px 12px -4px rgba(99, 102, 241, .45);
}
.btn-primary:hover, .btn-primary:focus { background: var(--ark-primary-dark); border-color: var(--ark-primary-dark); }
.btn-gradient {
    background: var(--ark-gradient);
    color: #fff;
    border: 0;
    box-shadow: 0 8px 22px -10px rgba(139, 92, 246, .65);
}
.btn-gradient:hover { color: #fff; opacity: .94; }
.btn-outline-primary { color: var(--ark-primary); border-color: var(--ark-primary); background: transparent; }
.btn-outline-primary:hover { background: var(--ark-primary); border-color: var(--ark-primary); color: #fff; }
.btn-success { background: var(--ark-success); border-color: var(--ark-success); }
.btn-warning { background: var(--ark-warn); border-color: var(--ark-warn); color: #fff; }
.btn-warning:hover { color: #fff; }
.btn-danger { background: var(--ark-danger); border-color: var(--ark-danger); }
[data-theme="dark"] .btn-light { background: var(--ark-surface); color: var(--ark-ink); border-color: var(--ark-border); }
[data-theme="dark"] .btn-outline-light { color: var(--ark-ink); border-color: rgba(255,255,255,.4); }

/* ===== Auth tabs ===== */
.auth-card .nav-tabs { border-bottom: 1px solid var(--ark-border); }
.auth-card .nav-tabs .nav-link {
    border: 0;
    border-bottom: 2px solid transparent;
    color: var(--ark-muted);
    font-weight: 600;
    padding: 12px 18px;
    background: transparent;
}
.auth-card .nav-tabs .nav-link.active {
    color: var(--ark-primary-dark);
    background: transparent;
    border-bottom-color: var(--ark-primary);
}
[data-theme="dark"] .auth-card .nav-tabs .nav-link.active { color: #c7d2fe; }

/* ===== Feature grid ===== */
.feature {
    border-radius: 14px;
    padding: 22px;
    background: var(--ark-surface);
    border: 1px solid var(--ark-border);
    height: 100%;
    color: var(--ark-ink);
}
.feature .icon {
    width: 42px; height: 42px;
    background: var(--ark-chip-bg);
    color: var(--ark-chip-fg);
    border-radius: 10px;
    display: inline-flex; align-items: center; justify-content: center;
    margin-bottom: 14px;
}
.feature h5 { font-weight: 600; letter-spacing: -.01em; color: var(--ark-ink); }
.feature p { color: var(--ark-muted); margin: 0; font-size: .95rem; }

/* ===== Code blocks ===== */
pre.ark-code {
    background: var(--ark-code-bg);
    color: var(--ark-code-fg);
    border-radius: 12px;
    padding: 18px 20px;
    font-size: .82rem;
    line-height: 1.6;
    overflow: auto;
    margin: 0;
    border: 1px solid var(--ark-border);
}
pre.ark-code .k { color: #93c5fd; }
pre.ark-code .s { color: #fcd34d; }
code.inline {
    background: var(--ark-chip-bg);
    color: var(--ark-chip-fg);
    padding: 2px 6px;
    border-radius: 5px;
    font-size: .85em;
}

/* ===== Footer ===== */
.ark-footer {
    border-top: 1px solid var(--ark-border);
    background: var(--ark-nav-bg);
    color: var(--ark-muted);
    padding: 18px 0;
}

/* ===== Tabulator tweaks ===== */
.tabulator { border-radius: 12px; overflow: hidden; border: 1px solid var(--ark-border); background: var(--ark-surface); color: var(--ark-ink); }
.tabulator .tabulator-header { background: var(--ark-surface-2); border-bottom: 1px solid var(--ark-border); }
.tabulator .tabulator-header .tabulator-col { background: transparent; border-right-color: var(--ark-border); color: var(--ark-ink); }
.tabulator-row { background: var(--ark-surface); color: var(--ark-ink); border-bottom-color: var(--ark-border); }
.tabulator-row.tabulator-row-even { background: var(--ark-row-alt); }
.tabulator-row:hover { background: var(--ark-row-hover) !important; }
.tabulator-row .tabulator-cell { border-right-color: var(--ark-border); }
.tabulator .tabulator-footer { background: var(--ark-surface-2); border-top: 1px solid var(--ark-border); color: var(--ark-muted); }

/* ===== Alerts ===== */
.alert { border-radius: 12px; border: 1px solid transparent; }
.alert-info { background: #eef2ff; color: var(--ark-primary-dark); border-color: #c7d2fe; }
.alert-success { background: #ecfdf5; color: #065f46; border-color: #a7f3d0; }
.alert-danger { background: #fef2f2; color: #991b1b; border-color: #fecaca; }
.alert-warning { background: #fffbeb; color: #92400e; border-color: #fde68a; }
[data-theme="dark"] .alert-info { background: rgba(99,102,241,.15); color: #c7d2fe; border-color: rgba(99,102,241,.4); }
[data-theme="dark"] .alert-success { background: rgba(16,185,129,.12); color: #6ee7b7; border-color: rgba(16,185,129,.35); }
[data-theme="dark"] .alert-danger { background: rgba(239,68,68,.12); color: #fca5a5; border-color: rgba(239,68,68,.35); }
[data-theme="dark"] .alert-warning { background: rgba(245,158,11,.12); color: #fcd34d; border-color: rgba(245,158,11,.35); }

/* ===== Tables (Bootstrap) ===== */
.table { color: var(--ark-ink); }
.table > :not(caption) > * > * { background: transparent; border-bottom-color: var(--ark-border); }
[data-theme="dark"] .table-primary, [data-theme="dark"] .table-primary > th, [data-theme="dark"] .table-primary > td {
    background: rgba(99,102,241,.18) !important; color: #c7d2fe;
}

/* ===== Misc ===== */
.font-mono { font-family: 'JetBrains Mono', SFMono-Regular, Menlo, Consolas, monospace; }
.section-eyebrow {
    text-transform: uppercase;
    letter-spacing: .14em;
    font-size: .75rem;
    font-weight: 700;
    color: var(--ark-primary-dark);
}
[data-theme="dark"] .section-eyebrow { color: #a5b4fc; }
.dim { color: var(--ark-muted); }
.hr-soft { border-top: 1px solid var(--ark-border); margin: 28px 0; }
.bg-light { background: var(--ark-surface-2) !important; color: var(--ark-ink); }

/* JSON editor (used on Test/Mcp screens) — stays dark in both themes */
.json-editor {
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    background: #0b1020;
    color: #e2e8f0;
    border-radius: 12px;
    border: 1px solid #1f2547;
    padding: 16px;
    min-height: 360px;
    resize: vertical;
    width: 100%;
    line-height: 1.55;
}
.json-editor:focus { outline: none; border-color: var(--ark-primary); box-shadow: 0 0 0 4px rgba(99, 102, 241, .25); }

.template-list { list-style: none; padding: 0; margin: 0; }
.template-list li {
    border: 1px solid var(--ark-border);
    border-radius: 10px;
    padding: 12px 14px;
    margin-bottom: 8px;
    cursor: pointer;
    transition: all .15s ease;
    background: var(--ark-surface);
    color: var(--ark-ink);
}
.template-list li:hover { border-color: var(--ark-primary); background: var(--ark-chip-bg); }
.template-list li.active { border-color: var(--ark-primary); background: var(--ark-chip-bg); box-shadow: 0 0 0 3px rgba(99, 102, 241, .15); }
.template-list li .name { font-weight: 600; }
.template-list li .desc { font-size: .8rem; color: var(--ark-muted); }