/*
 * Ark-Lumen — the ARK-RAPID AI theme. Creative direction "Guided by Light":
 * "Guided by Values. Driven by Innovation."
 *
 * Every page (chat, playground, login, and the Bootstrap-based admin pages)
 * pulls its palette from these custom properties. Change the look of the
 * whole app by editing this file only.
 *
 * Colours are sampled from the ARK-RAPID AI logo (img/ARK-RAPID_AI_logo_*.png):
 *   Abyss navy   #000619  the night the ark sails through — trust, depth
 *   Lumen cyan   #0ACEFB  the light at the bow — the values that guide
 *   Rapid blue   #2E71EC  momentum — every primary action
 *   AI violet    #6B28F4  innovation — the "AI" in the wordmark
 *
 * Two modes, picked before first paint by _ArkHead.cshtml and switched by
 * js/ark-theme.js: Daybreak (light, :root) and Nightwatch (dark,
 * [data-theme="dark"]). Cyan is light, not ink: it glows, underlines and
 * signals "ready", but small text uses --ark-light-ink.
 */
:root {
    /* ---- Brand constants (same in both modes) ---- */
    --ark-abyss: #000619;
    --ark-navy: #081338;
    --ark-cyan: #0ACEFB;
    --ark-blue: #2E71EC;
    --ark-indigo: #3155E2;
    --ark-violet: #6B28F4;
    --ark-lumen: linear-gradient(90deg, #0ACEFB 0%, #2E71EC 45%, #6B28F4 100%);
    --ark-accent-grad: linear-gradient(135deg, #2563EB 0%, #5B3BEF 100%);

    --ark-font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, "Helvetica Neue", Arial, sans-serif;
    --ark-font-display: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
    --ark-font-mono: "SF Mono", ui-monospace, Menlo, Consolas, monospace;

    /* ---- Daybreak (light) ---- */
    color-scheme: light;
    --ark-bg: #F6F8FC;
    --ark-bg-2: #FFFFFF;
    --ark-bg-3: #EEF2F9;
    --ark-bg-4: #E2E8F4;
    --ark-border: #DDE4F0;
    --ark-border-hover: #C3CEE3;
    --ark-input-bg: #FFFFFF;
    --ark-hover: rgba(8, 19, 56, 0.04);
    --ark-text: #0B1533;
    --ark-text-dim: #46506A;
    --ark-text-muted: #5E6782;
    --ark-heading: #081338;
    --ark-link: #1D5BD8;
    --ark-link-hover: #1440A8;
    --ark-accent: #2563EB;
    --ark-accent-hover: #1D4FD0;
    --ark-on-accent: #FFFFFF;
    --ark-light: #0ACEFB;
    --ark-light-ink: #0A6CB0;
    --ark-ai-ink: #5B2BD9;
    --ark-ai-grad: linear-gradient(90deg, #2E71EC 0%, #6B28F4 100%);
    --ark-glow: rgba(46, 113, 236, 0.20);
    --ark-glow-faint: rgba(10, 206, 251, 0.10);
    --ark-check: #2563EB;
    --ark-user-bubble: #EEF3FD;
    --ark-shadow: 0 1px 2px rgba(8, 19, 56, 0.06), 0 8px 24px rgba(8, 19, 56, 0.08);
    --ark-shadow-lg: 0 24px 48px rgba(8, 19, 56, 0.16);
    --ark-backdrop: rgba(0, 8, 31, 0.40);
    --ark-scroll: #D3DBEA;
    --ark-scroll-hover: #B9C4DA;

    --ark-success: #15803D;  --ark-success-bg: rgba(21, 128, 61, 0.10);  --ark-success-border: rgba(21, 128, 61, 0.30);
    --ark-danger: #B42318;   --ark-danger-bg: rgba(180, 35, 24, 0.08);   --ark-danger-border: rgba(180, 35, 24, 0.28);
    --ark-warning: #A15C07;  --ark-warning-bg: rgba(217, 119, 6, 0.10);  --ark-warning-border: rgba(217, 119, 6, 0.32);
    --ark-info: #1D5BD8;     --ark-info-bg: rgba(46, 113, 236, 0.10);    --ark-info-border: rgba(46, 113, 236, 0.30);
    --ark-on-danger: #FFFFFF;

    /* Console surfaces (status log tail) stay night-navy in both modes. */
    --ark-console-bg: #040B24;
    --ark-console-border: #13214A;
    --ark-console-text: #E3E8F0;
    --ark-console-dim: #93A1B8;

    /* JSON syntax highlighting (playground / trace viewers) */
    --ark-json-key: #1D5BD8;
    --ark-json-string: #2F7D32;
    --ark-json-number: #A15C07;
    --ark-json-bool: #B4237A;
    --ark-json-null: #64748B;
}

/* ---- Nightwatch (dark): the light kept burning through the night ---- */
:root[data-theme="dark"] {
    color-scheme: dark;
    --ark-bg: #030A22;
    --ark-bg-2: #071231;
    --ark-bg-3: #0C1A40;
    --ark-bg-4: #13234F;
    --ark-border: #172659;
    --ark-border-hover: #263C7C;
    --ark-input-bg: #0C1A40;
    --ark-hover: rgba(255, 255, 255, 0.05);
    --ark-text: #EAF0FF;
    --ark-text-dim: #A7B3D1;
    --ark-text-muted: #7684A8;
    --ark-heading: #FFFFFF;
    --ark-link: #7CC4FF;
    --ark-link-hover: #A9D8FF;
    --ark-accent: #2563EB;
    --ark-accent-hover: #3B76F5;
    --ark-on-accent: #FFFFFF;
    --ark-light: #0ACEFB;
    --ark-light-ink: #4FD8FF;
    --ark-ai-ink: #A78BFA;
    --ark-ai-grad: linear-gradient(90deg, #5B9BFF 0%, #A27BFF 100%);
    --ark-glow: rgba(10, 206, 251, 0.20);
    --ark-glow-faint: rgba(10, 206, 251, 0.07);
    --ark-check: #3B82F6;
    --ark-user-bubble: #0F1D4A;
    --ark-shadow: 0 8px 32px rgba(0, 0, 0, 0.45);
    --ark-shadow-lg: 0 24px 48px rgba(0, 0, 0, 0.60);
    --ark-backdrop: rgba(0, 3, 12, 0.65);
    --ark-scroll: #1A2B60;
    --ark-scroll-hover: #26408A;

    --ark-success: #4ADE80;  --ark-success-bg: rgba(74, 222, 128, 0.12);  --ark-success-border: rgba(74, 222, 128, 0.32);
    --ark-danger: #F87171;   --ark-danger-bg: rgba(248, 113, 113, 0.12);  --ark-danger-border: rgba(248, 113, 113, 0.35);
    --ark-warning: #FBBF24;  --ark-warning-bg: rgba(251, 191, 36, 0.12);  --ark-warning-border: rgba(251, 191, 36, 0.35);
    --ark-info: #7CC4FF;     --ark-info-bg: rgba(46, 113, 236, 0.16);    --ark-info-border: rgba(46, 113, 236, 0.40);
    --ark-on-danger: #2A0A0A;

    --ark-console-bg: #010616;

    --ark-json-key: #7CC4FF;
    --ark-json-string: #A7F3D0;
    --ark-json-number: #FCD34D;
    --ark-json-bool: #F0ABFC;
    --ark-json-null: #94A3B8;
}

:root {
    /* Short aliases used by chat.css / playground.css */
    --bg: var(--ark-bg);
    --bg-2: var(--ark-bg-2);
    --bg-3: var(--ark-bg-3);
    --bg-4: var(--ark-bg-4);
    --border: var(--ark-border);
    --border-hover: var(--ark-border-hover);
    --text: var(--ark-text);
    --text-dim: var(--ark-text-dim);
    --accent: var(--ark-accent);
    --accent-hover: var(--ark-accent-hover);
    --accent-grad: var(--ark-accent-grad);
    --on-accent: var(--ark-on-accent);
    --blue: var(--ark-blue);
    --danger: var(--ark-danger);
    --user-bubble: var(--ark-user-bubble);
    --assistant-bubble: transparent;
    --shadow: var(--ark-shadow);
    --panel: var(--ark-bg-3);
    --json-key: var(--ark-json-key);
    --json-string: var(--ark-json-string);
    --json-number: var(--ark-json-number);
    --json-bool: var(--ark-json-bool);
    --json-null: var(--ark-json-null);
}

/* Bootstrap reads its own variables; point them at Ark-Lumen. :root[data-theme]
   outranks Bootstrap's :root / [data-bs-theme] blocks. */
:root[data-theme] {
    --bs-body-bg: var(--ark-bg);
    --bs-body-color: var(--ark-text);
    --bs-emphasis-color: var(--ark-heading);
    --bs-heading-color: var(--ark-heading);
    --bs-secondary-color: var(--ark-text-dim);
    --bs-tertiary-color: var(--ark-text-muted);
    --bs-secondary-bg: var(--ark-bg-3);
    --bs-tertiary-bg: var(--ark-bg-3);
    --bs-border-color: var(--ark-border);
    --bs-code-color: var(--ark-ai-ink);
    --bs-font-sans-serif: var(--ark-font-sans);
    --bs-font-monospace: var(--ark-font-mono);
}

/* ---------- Base ---------- */
html, body {
    background: var(--ark-bg);
    color: var(--ark-text);
}
body {
    margin: 0;
    font-family: var(--ark-font-sans);
    /* First light: a faint glow above every page. */
    background:
        radial-gradient(1100px 420px at 50% -180px, var(--ark-glow-faint), transparent 70%),
        var(--ark-bg);
    background-repeat: no-repeat;
}
h1, h2, h3 { color: var(--ark-heading); }
h1, h2 {
    font-family: var(--ark-font-display);
    font-weight: 600;
    letter-spacing: -0.005em;
}
a { color: var(--ark-link); }
a:hover { color: var(--ark-link-hover); }
code, pre, kbd { font-family: var(--ark-font-mono); }
::selection { background: rgba(10, 206, 251, 0.30); color: var(--ark-heading); }
:focus-visible { outline: 2px solid var(--ark-light); outline-offset: 2px; }

/* ---------- The mark, wordmark and tagline ---------- */
.ark-mark {
    width: 30px; height: 30px;
    border-radius: 8px;
    display: inline-block;
    flex-shrink: 0;
    vertical-align: middle;
}
:root[data-theme="dark"] .ark-mark { box-shadow: 0 0 0 1px var(--ark-border-hover); }
.ark-mark-lg {
    width: 72px; height: 72px;
    border-radius: 18px;
    box-shadow: 0 0 0 1px var(--ark-border), 0 12px 40px var(--ark-glow);
}
/* A soft halo of light behind whatever it wraps (the mark on hero / login). */
.ark-glow {
    position: relative;
    display: inline-grid;
    place-items: center;
}
.ark-glow::before {
    content: "";
    position: absolute;
    inset: -40px;
    border-radius: 50%;
    background: radial-gradient(closest-side, rgba(10, 206, 251, 0.28), rgba(107, 40, 244, 0.10) 60%, transparent);
    z-index: 0;
}
.ark-glow > * { position: relative; z-index: 1; }

.ark-wordmark {
    font-family: var(--ark-font-sans);
    font-weight: 800;
    letter-spacing: 0.02em;
    white-space: nowrap;
}
.ark-wm-a { color: var(--ark-heading); }
.ark-wm-b { color: var(--ark-ai-ink); margin-left: 0.28em; }
.ark-lumen-text { color: var(--ark-ai-ink); }
@supports ((-webkit-background-clip: text) or (background-clip: text)) {
    .ark-wm-b {
        background: var(--ark-ai-grad);
        -webkit-background-clip: text;
        background-clip: text;
        color: transparent;
    }
    .ark-lumen-text {
        background: var(--ark-ai-grad);
        -webkit-background-clip: text;
        background-clip: text;
        color: transparent;
    }
}

.ark-tagline {
    font-family: var(--ark-font-display);
    font-style: italic;
    color: var(--ark-text-dim);
    letter-spacing: 0.01em;
}
.ark-eyebrow {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--ark-light-ink);
}

/* ---------- Theme switch (Daybreak / Nightwatch) ---------- */
.ark-theme-toggle {
    width: 32px; height: 32px;
    display: inline-grid;
    place-items: center;
    flex-shrink: 0;
    padding: 0;
    background: transparent;
    color: var(--ark-text-dim);
    border: 1px solid var(--ark-border);
    border-radius: 999px;
    cursor: pointer;
    transition: color .15s, border-color .15s, box-shadow .2s;
}
.ark-theme-toggle:hover {
    color: var(--ark-light-ink);
    border-color: var(--ark-light);
    box-shadow: 0 0 0 4px var(--ark-glow-faint);
}
.ark-theme-toggle .ark-icon-sun { display: none; }
:root[data-theme="dark"] .ark-theme-toggle .ark-icon-sun { display: block; }
:root[data-theme="dark"] .ark-theme-toggle .ark-icon-moon { display: none; }

/* ---------- Navbar ---------- */
.navbar.ark-navbar {
    background: var(--ark-bg-2) !important;
    border-bottom: 1px solid var(--ark-border) !important;
    box-shadow: none !important;
    padding-top: 0.6rem;
    padding-bottom: 0.6rem;
}
/* The lumen line: the logo's light, cyan to violet, across the top of the app.
   .ark-lumen-top gives the standalone chat / playground topbars the same line. */
.ark-lumen-top { position: relative; }
.navbar.ark-navbar::before, .ark-lumen-top::before {
    content: "";
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: var(--ark-lumen);
}
.navbar.ark-navbar .navbar-brand {
    color: var(--ark-heading) !important;
    gap: 10px;
    font-size: 1.05rem;
}
.navbar.ark-navbar .nav-link {
    position: relative;
    color: var(--ark-text-dim) !important;
    transition: color .15s;
}
.navbar.ark-navbar .nav-link:hover,
.navbar.ark-navbar .nav-link.active {
    color: var(--ark-heading) !important;
}
.navbar.ark-navbar .nav-link.active::after {
    content: "";
    position: absolute;
    left: 0.5rem; right: 0.5rem; bottom: -0.15rem;
    height: 2px;
    border-radius: 2px;
    background: var(--ark-lumen);
    box-shadow: 0 0 8px var(--ark-glow);
}
.navbar.ark-navbar .navbar-toggler { border-color: var(--ark-border); }
.ark-user {
    color: var(--ark-text-muted);
    font-size: 13px;
}
.dropdown-menu {
    background: var(--ark-bg-2);
    border: 1px solid var(--ark-border);
    box-shadow: var(--ark-shadow);
    border-radius: 10px;
}
.dropdown-item { color: var(--ark-text); }
.dropdown-item:hover, .dropdown-item:focus { background: var(--ark-bg-3); color: var(--ark-heading); }
.dropdown-divider { border-color: var(--ark-border); }

/* ---------- Branding (owner / client / powered-by logos) ---------- */
/* All driven from the Branding config section via BrandingOptions. Used in the
   shared navbar, the standalone chat/playground topbars and the login card. */
.brand-logo-img {
    height: 30px;
    width: auto;
    max-width: 160px;
    border-radius: 6px;
    display: inline-block;
    vertical-align: middle;
    object-fit: contain;
}
.brand-marks { display: inline-flex; align-items: center; gap: 14px; }
.brand-client-logo {
    height: 26px; width: auto; max-width: 150px;
    object-fit: contain; display: block;
}
.powered-by {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 11px;
    color: var(--ark-text-muted);
}
.powered-by .pb-label { text-transform: uppercase; letter-spacing: .04em; white-space: nowrap; }
.powered-by img { height: 20px; width: auto; max-width: 120px; object-fit: contain; opacity: .9; }

/* ---------- Buttons ---------- */
.btn { border-radius: 8px; }
.btn-primary {
    background: var(--ark-accent-grad);
    border-color: transparent;
    color: var(--ark-on-accent);
    font-weight: 600;
}
.btn-primary:hover, .btn-primary:focus, .btn-primary:active {
    background: var(--ark-accent-grad) !important;
    border-color: transparent !important;
    color: var(--ark-on-accent) !important;
    filter: brightness(1.08);
    box-shadow: 0 6px 18px var(--ark-glow) !important;
}
.btn-success {
    background-color: var(--ark-success-bg);
    border-color: var(--ark-success-border);
    color: var(--ark-success);
    font-weight: 600;
}
.btn-success:hover, .btn-success:focus, .btn-success:active {
    background-color: var(--ark-success-bg) !important;
    border-color: var(--ark-success) !important;
    color: var(--ark-success) !important;
}
.btn-outline-secondary {
    color: var(--ark-text-dim);
    border-color: var(--ark-border-hover);
}
.btn-outline-secondary:hover, .btn-outline-secondary:focus, .btn-outline-secondary:active {
    color: var(--ark-heading) !important;
    background-color: var(--ark-bg-3) !important;
    border-color: var(--ark-border-hover) !important;
}
.btn-outline-danger { color: var(--ark-danger); border-color: var(--ark-danger-border); }
.btn-outline-danger:hover, .btn-outline-danger:focus, .btn-outline-danger:active {
    background-color: var(--ark-danger) !important;
    border-color: var(--ark-danger) !important;
    color: var(--ark-on-danger) !important;
}
.btn-link { color: var(--ark-link); }
.btn-link:hover { color: var(--ark-link-hover); }
.btn:focus, .btn:active:focus, .btn-link.nav-link:focus, .form-control:focus, .form-select:focus, .form-check-input:focus {
    box-shadow: 0 0 0 0.2rem var(--ark-glow);
}

/* ---------- Cards / surfaces / footer ---------- */
.card, .ark-card {
    background: var(--ark-bg-2);
    border: 1px solid var(--ark-border);
    color: var(--ark-text);
}
.footer, footer.footer {
    background: var(--ark-bg);
    color: var(--ark-text-muted) !important;
    border-top: 1px solid var(--ark-border) !important;
    font-size: 13px;
}
.footer a { color: var(--ark-text-dim); }
.footer .ark-tagline { color: var(--ark-text-muted); }

/* ---------- Forms ---------- */
.form-control, .form-select {
    background-color: var(--ark-input-bg);
    border-color: var(--ark-border);
    color: var(--ark-text);
}
.form-control:focus, .form-select:focus {
    background-color: var(--ark-input-bg);
    color: var(--ark-text);
    border-color: var(--ark-blue);
}
.form-control::placeholder { color: var(--ark-text-muted); }
.form-label, .form-check-label { color: var(--ark-text-dim); }
.form-control:disabled, .form-select:disabled { background-color: var(--ark-bg-3); }
.form-check-input { background-color: var(--ark-input-bg); border-color: var(--ark-border-hover); }
.form-check-input:checked { background-color: var(--ark-check); border-color: var(--ark-check); }

/* ---------- Tables ---------- */
table, .table {
    color: var(--ark-text);
    border-color: var(--ark-border);
}
table th, .table th {
    background: var(--ark-bg-3);
    color: var(--ark-text-dim);
}
table th, table td, .table th, .table td {
    border-color: var(--ark-border) !important;
}
tbody tr { transition: background .12s; }
tbody tr:hover > td { background: var(--ark-hover); }

/* ---------- Alerts ---------- */
.alert { border-radius: 10px; }
.alert-success { background: var(--ark-success-bg); border-color: var(--ark-success-border); color: var(--ark-success); }
.alert-danger  { background: var(--ark-danger-bg);  border-color: var(--ark-danger-border);  color: var(--ark-danger); }
.alert-warning { background: var(--ark-warning-bg); border-color: var(--ark-warning-border); color: var(--ark-warning); }
.alert-info    { background: var(--ark-info-bg);    border-color: var(--ark-info-border);    color: var(--ark-info); }

/* ---------- Misc text utilities ---------- */
.text-muted { color: var(--ark-text-muted) !important; }
.text-danger { color: var(--ark-danger) !important; }
hr { border-color: var(--ark-border); }

/* ---------- Auth pages (Login): the light rising on the horizon ---------- */
.ark-auth {
    position: relative;
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 56px 16px;
    overflow: hidden;
    background:
        radial-gradient(900px 480px at 50% 112%, rgba(10, 206, 251, 0.22), transparent 70%),
        radial-gradient(600px 360px at 85% -10%, rgba(107, 40, 244, 0.12), transparent 70%),
        var(--ark-bg);
}
.ark-auth::after {
    /* The horizon the light rises from. */
    content: "";
    position: absolute;
    left: 10%; right: 10%; bottom: 64px;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--ark-light), var(--ark-violet), transparent);
    opacity: .6;
}
.ark-auth-corner { position: absolute; top: 16px; right: 16px; z-index: 2; }
.ark-auth-card {
    position: relative;
    z-index: 1;
    width: min(400px, 100%);
    background: var(--ark-bg-2);
    border: 1px solid var(--ark-border);
    border-radius: 18px;
    padding: 34px 28px 26px;
    box-shadow: var(--ark-shadow-lg);
    overflow: hidden;
}
.ark-auth-card::before {
    content: "";
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: var(--ark-lumen);
}
.ark-auth-mark { display: flex; justify-content: center; margin: 6px 0 20px; }
.ark-auth-logo-img {
    display: block;
    height: 48px;
    width: auto;
    max-width: 220px;
    object-fit: contain;
}
.ark-auth-card h1 {
    font-family: var(--ark-font-sans);
    font-size: 22px; text-align: center; margin: 0 0 6px;
}
.ark-auth-card .ark-tagline { text-align: center; font-size: 15px; margin: 0 0 6px; }
.ark-auth-card p.sub {
    text-align: center; color: var(--ark-text-muted); font-size: 13px; margin: 0 0 22px;
}
.ark-auth-card label {
    display: block; font-size: 12px; font-weight: 600; color: var(--ark-text-dim); margin-bottom: 6px;
}
.ark-auth-card input[type="text"], .ark-auth-card input[type="password"] {
    width: 100%;
    background: var(--ark-input-bg);
    border: 1px solid var(--ark-border);
    color: var(--ark-text);
    border-radius: 10px;
    padding: 11px 12px;
    font-size: 14px;
    margin-bottom: 16px;
    box-sizing: border-box;
    transition: border-color .15s, box-shadow .15s;
}
.ark-auth-card input:focus {
    outline: none;
    border-color: var(--ark-blue);
    box-shadow: 0 0 0 3px var(--ark-glow);
}
.ark-auth-card button[type="submit"] {
    width: 100%;
    background: var(--ark-accent-grad);
    color: var(--ark-on-accent);
    border: none;
    border-radius: 10px;
    padding: 12px;
    font-weight: 700;
    font-size: 14px;
    letter-spacing: .02em;
    cursor: pointer;
    transition: filter .15s, box-shadow .2s;
}
.ark-auth-card button[type="submit"]:hover {
    filter: brightness(1.08);
    box-shadow: 0 6px 20px var(--ark-glow);
}
.ark-auth-error {
    background: var(--ark-danger-bg);
    border: 1px solid var(--ark-danger-border);
    color: var(--ark-danger);
    border-radius: 10px;
    padding: 8px 12px;
    font-size: 13px;
    margin-bottom: 16px;
}
.ark-auth-brand {
    display: flex;
    justify-content: center;
    margin-top: 20px;
    padding-top: 18px;
    border-top: 1px solid var(--ark-border);
}
.ark-auth-footer {
    text-align: center;
    color: var(--ark-text-muted);
    font-size: 11px;
    margin: 16px 0 0;
}