@import url('https://fonts.googleapis.com/css2?family=Inter:wght@100;200;300;400;500;600;700&display=swap');
        :root { 
            --spinner-size: 48px;
            --overlay-bg: rgba(0,0,0,0.45);
            --ad-height: 100px;
            --ad-bg: transparent;
            --body-bg-start: #0a0a0a;
            --body-bg-end: #000000;
            --body-color: #ffffff;
            --glass-border: rgba(255,255,255,0.1);
            --shadow: 0 10px 30px rgba(0,0,0,0.5);
            --sidebar-bg: rgba(10,10,10,0.7);
            --sidebar-border: rgba(255,255,255,0.1);
            --textarea-border: rgba(255,255,255,0.2);
            --textarea-bg: rgba(255,255,255,0.05);
            --popup-bg: rgba(0, 0, 0, 1.0);
            --textarea-color: white;
            --placeholder-color: rgba(255,255,255,0.6);
            --btn-bg-start: rgba(255,255,255,0.06);
            --btn-bg-end: rgba(255,255,255,0.02);
            --btn-color: #fff;
            --btn-shadow: 0 6px 18px rgba(0,0,0,0.45);
            --btn-text-shadow: 1px 1px 0 rgba(255,255,255,0.85), 0 0 8px rgba(0,0,0,0.75);
            --card-bg-start: rgba(255,255,255,0.12);
            --card-bg-end: rgba(255,255,255,0.06);
            --overlay-color: rgba(6,10,18,0.55);
            --overlay-color2: rgba(6,10,18,0.65);
            --response-bg: rgba(0,0,0,0.3);
            --response-border: rgba(255,255,255,0.1);
            --response-color: rgba(255,255,255,0.9);
            --response-pre-bg: rgba(255,255,255,0.05);
            --heading-color: white;
            --footer-color: rgba(255,255,255,0.6);
            --footer-border: rgba(255,255,255,0.1);
            --info-color: #666;
            --diamond-content-color: white;
            --diamond-shadow: 0 0 20px rgba(0,0,0,0.5);
            --notification-shadow: 0 6px 18px rgba(0,0,0,0.5);
            --before-gradient:
                radial-gradient(circle at 20% 80%, rgba(120,119,198,0.3) 0%, transparent 50%),
                radial-gradient(circle at 80% 20%, rgba(255,119,198,0.15) 0%, transparent 50%),
                radial-gradient(circle at 40% 40%, rgba(120,119,198,0.1) 0%, transparent 50%);
            --after-bg: #0a0a0a;
            --sidebar-gradient: rgba(10,10,10,0.7);
        --st-cobalt-blue: #0047ab;
        --st-pure-pink: #ff69b4;
        --st-pure-cyan: #00ffff;
        }
        @media (prefers-color-scheme: light) {
            :root {
                --grad-btn-back: linear-gradient(135deg, rgba(200,200,200,0.9), rgba(255,255,255,0.06));
                --toggle-btn-shadow: #777777;
                --btn-bg-start: rgba(0, 0, 0, 0.0);
                --btn-bg-end: rgba(0, 0, 0, 0.0);
                --body-color: #1a1a1a;
                --glass-border: rgba(0,0,0,0.08);
                --shadow: 0 10px 30px rgba(0,0,0,0.08);
                --overlay-bg: rgba(255,255,255,0.65);
                --sidebar-bg: linear-gradient(90deg, #8f9fe6 0%, #b8c1e8 25%, #e1e5f2 65%, #ffffff 100%);
                --sidebar-border: rgba(0,0,0,0.08);
                --textarea-bg: rgba(255,255,255,0.4);
                --popup-bg: rgba(255,255,255,1.0);
                --textarea-border: rgba(0,0,0,0.15);
                --textarea-color: black;
                --placeholder-color: rgba(0,0,0,0.6);
                --btn-color: #fff;
                --btn-shadow: 0 0 5px black;
                --btn-text-shadow: none;
                --card-bg-start: rgba(255,255,255,0.7);
                --card-bg-end: rgba(255,255,255,0.7);
                --overlay-color: rgba(255,255,255,0.65);
                --overlay-color2: rgba(255,255,255,0.75);
                --response-bg: rgba(255,255,255,0.3);
                --response-border: rgba(0,0,0,0.2);
                --response-color: rgba(0,0,0,0.9);
                --response-pre-bg: rgba(0,0,0,0.09);
                --heading-color: #111;
                --footer-color: rgba(0,0,0,0.65);
                --footer-border: rgba(0,0,0,0.1);
                --info-color: rgba(0,0,0,0.65);
                --diamond-content-color: #ffffff;
                --diamond-shadow: 0 8px 20px rgba(0,0,0,0.12);
                --notification-shadow: 0 6px 18px rgba(0,0,0,0.15);
                --before-gradient:
                  radial-gradient(circle at 20% 80%, rgba(1,1,255,0.3) 0%, transparent 50%),
                  radial-gradient(circle at 80% 20%, rgba(11,119,198,0.15) 0%, transparent 50%),
                  radial-gradient(circle at 40% 40%, rgba(120,119,198,0.1) 0%, transparent 50%);
                --after-bg: #cccccc;
            }
        }
    body.Viridian { /* classic Dillora */
            --neon-lime: #c6ff00;
            --neon-yellow: #fff200;
            --neon-orange: #ff9900;
            --neon-red: #ff005d;
            --neon-purple: #b100ff;
            --neon-violet: #7b2dff;
            --neon-green: #00ff95;
            --neon-sky: #00eaff;
            --di-orange: #f57f17;
            --di-blue: #00bcd4;
            --di-night: #ffffff;
            --di-twilight: #dddddd;
            --di-dark: #121212;
            --di-light: #2a2a2a;
            --di-bright: #000000;
            --gray: #777777;
            --cobalt-blue: #0047ab;
            --pure-pink: #ff69b4;
            --pure-cyan: #00ffff;
            --pure-purple: #800080;
            --pure-red: #ff0000;
    }
    body.Montpellier {
      --cobalt-blue: #0047ab;
      --pure-pink: #ff69b4;
      --pure-cyan: #00ffff;
      --box-shadow: rgba(79,70,229,0.3);
    }
    body.Glass {
      --box-shadow: rgba(79,70,229,0.3);
    }
    body.Indigo {
            --neon-lime: #c6ff00;
            --neon-yellow: #fff200;
            --neon-orange: #ff9900;
            --neon-red: #ff005d;
            --neon-purple: #b100ff;
            --neon-violet: #7b2dff;
            --neon-green: #00ff95;
            --neon-sky: #00eaff;
            --di-orange: #330000;
            --di-blue: #440077;
            --di-night: #999999;
            --di-twilight: #888888;
            --di-dark: #676767;
            --di-light: #707070;
            --di-bright: #555555;
            --gray: #777777;
            --cobalt-blue: #5500FF;
            --pure-pink: #ff69b4;
            --pure-cyan: #330044;
            --pure-purple: #800080;
            --pure-red: #ff0000;
    }
    body.Cardiff {
            --neon-orange: #998866;
            --neon-red: #995577;
            --us-dark-blue: #665577;
            --neon-purple: #995599;
            --neon-violet: #776699;
            --neon-green: #559966;
            --neon-sky: #aaddff;
            --di-orange: #807f66;
            --di-blue: #558877;
            --di-night: #999999;
            --di-twilight: #888888;
            --di-dark: #676767;
            --di-light: #707070;
            --di-bright: #555555;
            --cobalt-blue: #447799;
            --pure-pink: #997788;
            --pure-cyan: #559999;
            --gray: #777777;
            --pure-red: #775555;
    }
    body.Obsidian {
            --neon-orange: #332200;
            --neon-red: #331122;
            --us-dark-blue: #221133;
            --neon-purple: #200020;
            --neon-violet: #051100;
            --neon-green: #003322;
            --neon-sky: #114455;
            --di-orange: #332200;
            --di-blue: #001105;
            --di-night: #222222;
            --di-twilight: #151515;
            --di-dark: #111111;
            --di-light: #222222;
            --di-bright: #252525;
            --cobalt-blue: #000055;
            --pure-pink: #220011;
            --pure-cyan: #003333;
            --gray: #333333;
            --pure-red: #500000;
    }
        body.Granite {
          --neon-lime: #a3a3a3;
          --neon-yellow: #b3b3b3;
          --neon-orange: #9a9a9a;
          --neon-red: #8b8b8b;
          --neon-purple: #7c7c7c;
          --neon-violet: #6e6e6e;
          --neon-green: #9e9e9e;
          --neon-sky: #adadad;
          --di-orange: #757575;
          --di-blue: #828282;
          --di-night: #f0f0f0;
          --di-twilight: #e0e0e0;
          --di-dark: #1a1a1a;
          --di-light: #2e2e2e;
          --di-bright: #0a0a0a;
          --gray: #808080;
          --cobalt-blue: #6b6b6b;
          --pure-pink: #9e9e9e;
          --pure-cyan: #bdbdbd;
          --pure-purple: #8e8e8e;
          --pure-red: #949494;
        }
        .content {
            margin-top: 50px;
        }
        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
            min-height: 100vh;
            background: linear-gradient(135deg,
                var(--body-bg-start) 0%,
                #1a1a2e 25%,
                #16213e 50%,
                #0f0f23 75%,
                var(--body-bg-end) 100%);
            background-attachment: fixed;
            background-attachment: scroll;
            overflow-x: hidden;
            position: relative;
            margin: 0;
            padding: 0;
            display: flex;
            flex-direction: column;
            color: var(--body-color);
        }
        @media (prefers-color-scheme: light) {
            body:not(.dark-mode) {
                background: linear-gradient(135deg,
                    #f8faff 0%,
                    #eef2ff 30%,
                    #fdfbff 60%,
                    #ffffff 100%);
            }
        }
        body.light-mode {
            background: linear-gradient(135deg,
                #f8faff 0%,
                #eef2ff 30%,
                #fdfbff 60%,
                #ffffff 100%);
        }
        body::after {
            content: '';
            position: fixed;
            top: 0; left: 0;
            width: 100%; height: 100%;
            background: var(--after-bg);
            z-index: -2;
            pointer-events: none;
        }
        body::before {
            content: '';
            position: fixed;
            top: 0; left: 0;
            width: 100%; height: 100%;
            background: var(--before-gradient);
            animation: drift 20s ease-in-out infinite alternate;
            pointer-events: none;
            z-index: -1;
        }
        .fade-overlay {
            position: fixed;
            top: 0; left: 0;
            width: 100%; height: 100%;
            background: #000;
            z-index: 9999;
            display: flex;
            align-items: center;
            justify-content: center;
            animation: fadeOut 0.5s ease-in-out 0.2s forwards;
        }
        .fade-overlay::before {
            content: '';
            position: absolute;
            width: 100px; height: 100px;
            border: 4px solid transparent;
            border-top-color: #fff;
            border-radius: 50%;
            animation: spin 0.2s linear infinite, fadeOutSpin 0.5s ease-in-out 0.2s forwards;
        }
        @keyframes fadeOut {
            0%   { opacity: 1; clip-path: circle(150% at 50% 50%); }
            100% { opacity: 0; clip-path: circle(0% at 50% 50%); pointer-events: none; }
        }
        @keyframes fadeOutSpin {
            0%   { opacity: 1; transform: scale(1); }
            100% { opacity: 0; transform: scale(0); }
        }
        @keyframes spin {
            to { transform: rotate(360deg); }
        }
        @keyframes fadeIn {
            to { opacity: 1; }
        }
        @keyframes slideUp {
            to { transform: translateY(0); opacity: 1; }
        }
        body.low-power-mode::before {
            animation: none !important;
            background:
                radial-gradient(circle at 20% 80%, rgba(120,119,198,0.15) 0%, transparent 50%),
                radial-gradient(circle at 80% 20%, rgba(255,119,198,0.08) 0%, transparent 50%),
                radial-gradient(circle at 40% 40%, rgba(120,119,198,0.05) 0%, transparent 50%) !important;
        }
        body.low-power-mode .diamond:hover {
            transform: rotate(45deg) scale(1.02);
            transition-duration: 0.15s;
        }
        .power-toggle-btn {
            border-radius: 50%;
            background: linear-gradient(135deg, rgba(100,100,100,0.9), rgba(255,255,255,0.06));
            color: var(--toggle-btn-shadow);
            border: 1px solid rgba(255,255,255,0.2);
            cursor: pointer;
            box-shadow: 0 4px 12px rgba(0,0,0,0.25);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
            transition: all 0.3s ease;
            backdrop-filter: blur(10px) saturate(160%);
            z-index: 9998;
            padding: 0;
            margin-left: 50px;
        }
        .power-toggle-btn:hover {
            background: linear-gradient(135deg, rgba(255,255,255,0.18), rgba(255,255,255,0.1));
            transform: scale(1.1);
            border-color: rgba(255,255,255,0.3);
        }
        .power-toggle-btn:active {
            transform: scale(1.05);
        }
        .power-toggle-btn::after {
            content: attr(title);
            position: absolute;
            bottom: -40px;
            left: 50%;
            transform: translateX(-50%);
            background: rgba(0,0,0,0.8);
            color: white;
            padding: 5px 10px;
            border-radius: 4px;
            font-size: 12px;
            white-space: nowrap;
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.3s ease;
        }
        .power-toggle-btn:hover::after {
            opacity: 1;
        }
        input[type="submit"],
        button[type="submit"] {
            appearance: none;
            border: 0;
            padding: 14px 22px;
            border-radius: 40px;
            background: linear-gradient(180deg, var(--btn-bg-start), var(--btn-bg-end));
            color: var(--btn-color);
            text-shadow: var(--btn-shadow);
            font-weight: 300;
            font-size: 1.1rem;
            cursor: pointer;
            backdrop-filter: blur(6px) saturate(120%);
            box-shadow: 0 4px 12px var(--box-shadow);
            transition: transform .22s ease, box-shadow .22s ease;
            position: relative;
        }
        input[type="submit"]:hover,
        button[type="submit"]:hover {
            transform: translateY(-4px);
            box-shadow: 0 16px 36px rgba(0,0,0,0.5);
        }
        @keyframes drift {
            0%   { transform: rotate(0deg) scale(1); }
            100% { transform: rotate(180deg) scale(1.1); }
        }
        button[type="submit"] {
            position: relative;
            overflow: hidden;
        }
        button[type="submit"].loading {
            cursor: not-allowed;
        }
        .btn-text {
            display: inline-block;
            transition: opacity 0.3s ease;
        }
        button[type="submit"].loading .btn-text {
            opacity: 0;
        }
        button[type="submit"].loading {
            opacity: 1;
            visibility: visible;
        }
        .spinner-overlay {
            position: fixed;
            inset: 0;
            display: none;
            align-items: center;
            justify-content: center;
            z-index: 9999;
        }
        .spinner-overlay[aria-hidden="false"] {
            display: flex;
        }
        .spinner {
            width: var(--spinner-size);
            height: var(--spinner-size);
            border-radius: 50%;
            box-sizing: border-box;
            border: calc(var(--spinner-size) / 8) solid rgba(255,255,255,0.15);
            border-top-color: rgba(255,255,255,0.95);
            border-right-color: rgba(255,255,255,0.65);
            animation: spin 0.9s linear infinite;
            box-shadow: 0 0 calc(var(--spinner-size) / 12) rgba(255,255,255,0.08) inset;
        }
        .container {
            display: grid;
            grid-template-columns: 300px 1fr;
            min-height: 100vh;
            max-width: 100%;
            overflow-x: hidden;
            z-index: 100;
            position: relative;
        }
        .btn-primary {
            appearance: none;
            border: 0;
            padding: 14px 22px;
            border-radius: 14px;
            background: linear-gradient(180deg, var(--btn-bg-start), var(--btn-bg-end));
            color: var(--btn-color);
            text-shadow: var(--btn-shadow);
            font-weight: 300;
            font-size: 1.1rem;
            cursor: pointer;
            backdrop-filter: blur(6px) saturate(120%);
            box-shadow: var(--btn-shadow), inset 0 1px 0 rgba(255,255,255,0.03);
            transition: transform .22s ease, box-shadow .22s ease;
            position: relative;
        }
        .brand-mark {
            width: 56px; height: 56px;
            border-radius: 12px;
            background: linear-gradient(135deg, #fff6d6 0%, #ffd88e 100%);
            display: grid;
            place-items: center;
            color: #1a1a1a;
            font-weight: 700;
            font-family: 'Playfair Display', serif;
        }
        .overlay {
            position: fixed; inset: 0;
            display: grid;
            place-items: center;
            padding: 28px;
            /*z-index: 60;*/
            z-index: 9999 !important;
            background: linear-gradient(180deg, var(--overlay-color), var(--overlay-color2));
            backdrop-filter: blur(6px) saturate(120%);
            opacity: 0;
            pointer-events: none;
            transition: opacity .35s var(--ease);
        }
        .overlay.show { opacity: 1; pointer-events: auto; }
        .glass-card {
            width: min(760px, calc(100% - 56px));
            border-radius: var(--radius);
            padding: 28px;
            position: relative;
            background: linear-gradient(180deg, var(--card-bg-start), var(--card-bg-end));
            border: 1px solid var(--glass-border);
            box-shadow: var(--shadow);
            backdrop-filter: blur(20px) saturate(160%);
            overflow: hidden;
            transform: translateY(18px) scale(.995);
            transition: transform .42s var(--ease), opacity .32s var(--ease);
            color: var(--response-color);
        }
        .overlay.show .glass-card { transform: translateY(0) scale(1); }
        .glass-card::before,
        .glass-card::after {
            content: ''; position: absolute; inset: 0;
            border-radius: inherit; pointer-events: none;
        }
        .glass-card::before {
            background: linear-gradient(120deg, var(--accentA), transparent 30%);
            mix-blend-mode: screen; opacity: .85; filter: blur(40px);
            transform: translate(-10%, -30%);
            width: 600px; height: 600px; left: -140px; top: -180px;
        }
        .glass-card::after {
            background: linear-gradient(220deg, var(--accentB), transparent 30%);
            mix-blend-mode: screen; opacity: .7; filter: blur(48px);
            transform: translate(10%, 40%);
            width: 420px; height: 420px; right: -90px; bottom: -140px;
        }
        .sidebar {
            width: 300px;
            padding: 2rem 1rem;
            background: var(--sidebar-bg);
            backdrop-filter: blur(10px);
            border-right: 1px solid var(--sidebar-border);
            display: flex;
            flex-direction: column;
            transition: all 0.35s ease;
            overflow: visible;
            z-index: 1000;
        }
        .sidebar .diamond-grid { overflow: visible; }
        .sidebar.history-mode .diamond-grid { display: none; }
        .sidebar.history-mode .history-list {
            display: block;
            padding: 15px;
            color: var(--heading-color);
            overflow-y: auto;
        }
        .sidebar.history-mode .history-list * { color: inherit; }
        .sidebar.hidden {
            transform: translateX(-260px);
            opacity: 0;
            pointer-events: none;
            transition: all 0.35s ease;
        }
        .main-content {
            width: 100%;
            max-width: 100%;
            padding: 0 30px;
            box-sizing: border-box;
            display: flex;
            flex-direction: column;
            overflow-x: hidden;
            transition: all 0.3s ease;
            color: var(--body-color);
        }
        .container.sidebar-hidden {
            grid-template-columns: 0 1fr;
        }
        .sidebar-hidden .main-content {
            width: 100%;
            padding-right: 10px;
            max-width: none;
        }
        .sidebar-toggle-btn {
            position: fixed;
            top: 12px; left: 12px;
            z-index: 5580;
            background: linear-gradient(180deg, var(--btn-bg-start), var(--btn-bg-end));
            color: var(--btn-color);
            text-shadow: var(--btn-shadow);
            border: none;
            padding: 10px 12px;
            border-radius: 8px;
            font-size: 18px;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 4px 12px var(--box-shadow);
        }
        .sidebar-toggle-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.3);
        }
        .special-offer-btn {
            position: fixed;
            left: 80%;
            top: var(--btn-top, 80px);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.3rem;
            width: fit-content;
            background: linear-gradient(180deg, var(--di-night), var(--di-bright), var(--cobalt-blue));
            background-size: 101% auto;
            color: var(--btn-color);
            text-shadow: var(--btn-shadow);
            font-weight: 600;
            font-family: inherit;
            text-decoration: none !important;
            padding: 0.4rem 1.5rem;
            border-radius: 10px;
            border: none;
            cursor: pointer;
            box-shadow: 0 4px 12px var(--box-shadow);
            letter-spacing: 0.2px;
            backdrop-filter: blur(1px);
            transition: all 0.3s ease;
            background-position: 0% 50%;
            z-index: 9999;
        }
        .special-offer-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.3);
        }
        .newchat-btn {
            position: fixed;
            top: 20px; right: 20px;
            width: 36px; height: 36px;
            border-radius: 50%;
            background: linear-gradient(90deg, var(--pure-pink), var(--cobalt-blue), var(--pure-cyan));
            color: var(--btn-color);
            text-shadow: var(--btn-shadow);
            border: none;
            cursor: pointer;
            box-shadow: 0 4px 10px rgba(0,0,0,0.25);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            transition: all 0.3s ease;
            z-index: 9999;
            box-shadow: 0 4px 12px var(--box-shadow);
        }
        .newchat-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.3);
        }
        .diamond-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            grid-gap: 15px;
            margin-top: 20px;
        }
        .diamond::before {
            content: "";
            position: absolute; top: 0; left: 0; right: 0; bottom: 0;
            background: linear-gradient(135deg,
                rgba(255,255,255,0.1) 0%,
                rgba(255,255,255,0) 50%,
                rgba(0,0,0,0.3) 100%);
        }
        .diamond:hover {
            transform: rotate(45deg) scale(1.05);
            box-shadow: 0 0 30px var(--di-blue);
            z-index: 10;
        }
        .diamond-content {
            transform: rotate(-45deg);
            width: 100%; height: 100%;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            color: var(--diamond-content-color);
            font-size: 0.85rem;
            text-align: center;
            text-shadow: 0 0 5px black;
            padding: 15px;
            box-sizing: border-box;
            word-break: break-word;
            overflow: hidden;
            line-height: 1.3;
            pointer-events: auto;
        }
        @media (prefers-color-scheme: light) {
            .diamond-content { text-shadow: 0 1px 2px rgba(0,0,0,0.85), 0 0 6px rgba(0,0,0,0.75); }
            .diamond { border: 1px solid rgba(0,0,0,0.08); }
        }
        .diamond:nth-child(14n+1), .diamond:nth-child(14n+14) { --bg: linear-gradient(135deg, var(--di-blue), var(--di-orange)); }
        .diamond:nth-child(14n+2), .diamond:nth-child(14n+3) { --bg: linear-gradient(135deg, var(--cobalt-blue), var(--di-bright), var(--pure-cyan)); }
        .diamond:nth-child(14n+4), .diamond:nth-child(14n+5) { --bg: linear-gradient(135deg, var(--di-night), var(--di-bright), var(--cobalt-blue)); }
        .diamond:nth-child(14n+6), .diamond:nth-child(14n+7) { --bg: linear-gradient(135deg, var(--cobalt-blue), var(--di-light), var(--pure-pink)); }
        .diamond:nth-child(14n+8), .diamond:nth-child(14n+9) { --bg: linear-gradient(135deg, var(--cobalt-blue), var(--pure-pink)); }
        .diamond:nth-child(14n+10), .diamond:nth-child(14n+11) { --bg: linear-gradient(135deg, var(--pure-pink), var(--pure-cyan)); }
        .diamond:nth-child(14n+12), .diamond:nth-child(14n+13) { --bg: linear-gradient(135deg, var(--pure-cyan), var(--di-bright), var(--di-blue)); }
        .diamond {
            aspect-ratio: 1/1;
            transform: rotate(45deg);
            border: 1px solid rgba(255,255,255,0.1);
            box-shadow: var(--diamond-shadow);
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
            background: var(--bg);
            box-shadow: 0 4px 12px var(--box-shadow);
        }
        header {
            text-align: center;
            padding: 30px 0;
            position: relative;
            margin-bottom: 40px;
        }
        header::before {
            content: "";
            position: absolute;
            top: 50%; left: 0; right: 0;
            height: 1px;
            background: linear-gradient(90deg, transparent, var(--pure-pink), var(--cobalt-blue), var(--pure-cyan), transparent);
            z-index: -1;
        }
        .hero-title {
            font-size: clamp(1rem, 2vw, 2rem);
            font-weight: 100;
            text-align: center;
            margin-bottom: 1rem;
            background: linear-gradient(90deg, var(--pure-pink), var(--cobalt-blue), var(--pure-cyan));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            letter-spacing: -0.02em;
            line-height: 1.1;
        }
        .hero-subtitle {
            font-size: clamp(1.2rem, 3vw, 1.8rem);
            font-weight: 200;
            color: var(--footer-color);
            text-align: center;
            margin-bottom: 4rem;
            letter-spacing: -0.01em;
            padding-right: 50px;
            padding-left: 50px;
        }
        footer {
            text-align: center;
            padding: 30px 0;
            margin-top: auto;
            margin-bottom: var(--ad-height);
            border-top: 1px solid var(--footer-border);
            color: var(--footer-color);
            font-size: 0.8rem;
            width: 100%;
            position: relative;
            z-index: 200;
            background: inherit;
            box-sizing: border-box;
        }
        footer::after {
            content: '';
            position: absolute;
            bottom: calc(-1 * var(--ad-height));
            left: 0; right: 0;
            height: var(--ad-height);
            background: inherit;
            z-index: -1;
        }
        .sidebar-title {
            text-align: center;
            font-size: 1.5rem;
            margin-bottom: 2rem;
            font-weight: 300;
            text-transform: uppercase;
            letter-spacing: 2px;
            background: linear-gradient(90deg, var(--st-pure-pink), var(--st-cobalt-blue), var(--st-pure-cyan));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }
        @media (min-width: 1200px) {
            footer { padding-right: 30px; }
        }
        @media (max-width: 1024px) {
            .container { grid-template-columns: minmax(180px, 22%) 1fr; }
            .sidebar { width: 100%; padding: 1.5rem 0.75rem; }
            .main-content { padding: 0 1rem; }
            #adWrapper { padding: 0 1rem; }
            .diamond-grid { grid-template-columns: repeat(2, 1fr); grid-gap: 4px; }
            .diamond { transform: rotate(45deg) scale(1.2); width: 70px; height: 70px; }
            .diamond:hover { transform: rotate(45deg) scale(1.35); }
            .diamond-content { font-size: 0.6rem; padding: 3px; line-height: 1.1; }
        }
        @media (max-width: 768px) {
            .container { grid-template-columns: minmax(150px, 32%) 1fr; }
            .sidebar { padding: 1rem 0.5rem; width: 100%; }
            .main-content { padding: 0 0.5rem; overflow: hidden; }
            #adWrapper { padding: 0 0.5rem; overflow: hidden; }
            .diamond-grid { grid-template-columns: repeat(2, 1fr); grid-gap: 4px; }
            .diamond { transform: rotate(45deg) scale(1.3); transform-origin: center; margin: 0 auto; width: 60px; height: 60px; }
            .diamond-content { font-size: 0.6rem; padding: 5px; line-height: 1.1; }
            .diamond:hover { transform: rotate(45deg) scale(1.55); }
            .response-container, .error-container, .rate-limit-container, .prompt-container { padding: 0.8rem; margin: 0; }
            .sidebar-title { font-size: 1.3rem; margin-bottom: 1rem; }
            form { max-width: 100%; overflow: hidden; }
            textarea { min-height: 80px; font-size: 14px; }
        }
        @media (max-width: 480px) {
            .spinner { width: calc(var(--spinner-size) * 0.85); height: calc(var(--spinner-size) * 0.85); }
            .container { grid-template-columns: minmax(100px, 22%) 1fr; }
            .sidebar { padding: 0.5rem 0.25rem; width: 100%; }
            .main-content { padding: 0 0.25rem; }
            #adWrapper { padding: 0 0.25rem; }
            .diamond-grid { grid-template-columns: 1fr; grid-gap: 4px; }
            .diamond { transform: rotate(45deg) scale(1.1); width: 50px; height: 50px; }
            .diamond-content { font-size: 0.6rem; padding: 4px; }
            .diamond:hover { transform: rotate(45deg) scale(1.1); }
            .sidebar-title { font-size: 1.2rem; transform: scale(0.7); }
            header { padding: 20px 0; margin-bottom: 20px; }
            .hero-subtitle { margin-bottom: 2rem; }
        }
        #sign-in-container {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 100%;
            margin: 2rem 0;
        }
        #sign-in { width: 100%; }
        .user-info {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            margin-bottom: 2rem;
            padding: 1rem;
            background: rgba(255,255,255,0.1);
            border-radius: 8px;
            backdrop-filter: blur(5px);
        }
        .user-welcome {
            color: var(--heading-color);
            font-size: 1.1rem;
            padding-left: 24px;
        }
        .sign-out-btn {
            background: linear-gradient(180deg, var(--gray), var(--di-bright), var(--pure-red), var(--di-bright));
            color: var(--btn-color);
            text-shadow: var(--btn-shadow);
            border: none;
            border-radius: 6px;
            padding: 8px 16px;
            font-family: inherit;
            font-size: 16px;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.3s ease;
            display: block;
            width: fit-content;
            margin: 0 auto;
            box-shadow: 0 4px 12px var(--box-shadow);
        }
        .sign-out-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.3);
        }
        form {
            width: 100%;
            max-width: 100%;
            margin: 0 auto;
            box-sizing: border-box;
        }
        ::placeholder { color: var(--placeholder-color); }
        .form-controls {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-top: 15px;
            padding-bottom: 6px;
        }
        .return-toggle {
            display: flex;
            align-items: center;
            background: var(--grad-btn-back);
            color: var(--footer-color);
            font-size: 0.9rem;
            margin-left: 50px;
        }
        .toggle-switch {
            position: relative;
            display: inline-block;
            width: 40px; height: 20px;
            margin-right: 8px;
        }
        .toggle-switch input { opacity: 0; width: 0; height: 0; }
        .toggle-slider {
            position: absolute;
            cursor: pointer;
            top: 0; left: 0; right: 0; bottom: 0;
            background-color: rgba(255,255,255,0.2);
            transition: .4s;
            border-radius: 34px;
        }
        .toggle-slider:before {
            position: absolute;
            content: "";
            height: 16px; width: 16px;
            left: 2px; bottom: 2px;
            background-color: white;
            transition: .4s;
            border-radius: 50%;
        }
        input:checked + .toggle-slider { background-color: var(--di-blue); }
        input:checked + .toggle-slider:before { transform: translateX(20px); }
        .rate-limit-container {
            text-align: center;
            margin: 2rem 0;
            padding: 2rem;
            background: var(--response-bg);
            border-radius: 12px;
            border: 1px solid var(--response-border);
            color: var(--response-color);
            width: 100%;
            max-width: 100%;
            box-sizing: border-box;
        }
        .rate-limit-diamond {
            width: 100px; height: 100px;
            margin: 0 auto 1.5rem;
            background: linear-gradient(135deg, var(--pure-red), var(--cobalt-blue));
        }
        .rate-limit-container h2 { color: var(--heading-color); margin-bottom: 1rem; font-weight: 500; }
        .rate-limit-container p { color: var(--response-color); line-height: 1.6; }
        .response-container, .error-container, .prompt-container {
            width: 100%;
            max-width: 100%;
            padding: 0.8rem;
            background: var(--response-bg);
            border-radius: 12px;
            border: 1px solid var(--response-border);
            box-sizing: border-box;
            position: relative;
            overflow: hidden;
            color: var(--response-color);
        }
        .response-container h2, .error-container h2, .prompt-container h2 { color: var(--heading-color); font-weight: 500; }
        .response-container pre, .error-container pre, .prompt-container pre {
            color: var(--response-color);
            white-space: pre-wrap;
            word-wrap: break-word;
            line-height: 1.5;
            background: var(--response-pre-bg);
            padding: 0.7rem;
            padding-bottom: 4rem;
            border-radius: 8px;
            overflow-x: auto;
            max-width: 100%;
            box-sizing: border-box;
        }
        .copy-btn,
        .copy-btnR {
            position: absolute;
            top: 12px;
            width: 34px; height: 34px;
            font-size: 14px;
            background: linear-gradient(90deg, var(--pure-pink), var(--cobalt-blue), var(--pure-cyan));
            text-shadow: var(--btn-shadow);
            border: none;
            border-radius: 50%;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            z-index: 10;
            box-shadow: 0 4px 12px var(--box-shadow) !important;
            color: white !important;
            transition: all 0.3s ease !important;
        }
        .copy-btn {
            left: 12px;
        }
        .copy-btnR {
            right: 12px;
        }
        .copy-btn:hover, .copy-btnR:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.3);
        }
        .copy-btn.copied, .copy-btnR.copied {
          color: var(--cobalt-blue);
        }
        .loading { color: var(--heading-color); }
        .tinySpinner {
            width: 4px; height: 4px;
            border: 2px solid #ddd;
            border-top-color: #555;
            border-radius: 50%;
            position: fixed;
            bottom: 34px; right: 34px;
            animation: tinySpin 0.75s linear infinite;
        }
        @keyframes tinySpin { to { transform: rotate(360deg); } }
        .notification {
            position: fixed;
            top: 20px; right: 20px;
            background: #2ecc71;
            color: white;
            padding: 15px 25px;
            border-radius: 5px;
            box-shadow: var(--notification-shadow);
            transform: translateY(-100px);
            opacity: 0;
            transition: all 0.3s ease;
            z-index: 1000;
        }
        .notification.show { transform: translateY(0); opacity: 1; }
        .model-selector { position: relative; width: 100%;
                          z-index: auto;
                        }
        .selector-button {
            width: 100%;
            padding: 16px 20px;
            background: linear-gradient(135deg, var(--cobalt-blue), var(--di-bright), var(--pure-cyan));
            color: var(--btn-color);
            text-shadow: var(--btn-shadow);
            border: none;
            border-radius: 12px;
            font-size: 18px;
            font-weight: 500;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: all 0.3s ease;
            box-shadow: 0 4px 12px var(--box-shadow);
        }
        .selector-button:hover { box-shadow: 0 5px 15px rgba(0,0,0,0.3); transform: translateY(-2px); }
        .selector-button:active { transform: translateY(0); }
        .selector-arrow { transition: transform 0.3s ease; font-size: 14px; }
  .dropdown-list {
    position: absolute;
    bottom: calc(100% - 300px);
    max-height: 90vh;
    background: var(--popup-bg);
    color: var(--textarea-color);
    border: 1px solid var(--textarea-border);
    border-radius: 12px;
    overflow-y: auto;
    overflow-x: hidden;
    width: auto;
    min-width: 100%;
    max-width: 85vw;
    z-index: 99999;
    box-shadow: 0 8px 24px rgba(0,0,0,0.4);
    background-position: 
        top center,
        bottom center,
        top 6px center,
        bottom 6px center;
    background-repeat: no-repeat;
    background-size: 
        100% 40px,
        100% 40px,
        20px 20px,
        20px 20px;
    background-attachment: local, local, scroll, scroll;
}
.dropdown-list > *:first-child {
    padding-top: 15px;
}
.dropdown-list > *:last-child {
    padding-bottom: 15px;
}
.dropdown-header {
    padding: 14px 20px;
    font-family: 'Courier New', Courier, monospace;
    font-size: 13px;
    font-weight: bold;
    color: var(--textarea-color);
    opacity: 0.6;
    border-bottom: 2px solid var(--textarea-border);
    white-space: pre;
    min-width: max-content;
    pointer-events: none;
}
.dropdown-item {
    padding: 12px 20px;
    cursor: pointer;
    font-family: 'Courier New', Courier, monospace;
    font-size: 14px;
    color: var(--textarea-color);
    white-space: pre;
    min-width: max-content;
    border-bottom: 1px solid rgba(255,255,255,0.05);
    transition: background 0.2s;
}
.dropdown-item:hover {
    background: rgba(255, 255, 255, 0.1);
}
.dropdown-item.selected {
    background: rgba(0, 200, 255, 0.2);
    color: var(--pure-cyan);
    font-weight: bold;
}
        .dropdown-item.selected::before { content: "✓"; margin-right: 10px; font-weight: bold; }
        .info-text { margin-top: 20px; font-size: 14px; color: var(--info-color); line-height: 1.5; }
        #adWrapper {
            width: 100%;
            max-width: 100%;
            padding: 100px 30px 0;
            box-sizing: border-box;
            display: flex;
            flex-direction: column;
            overflow-x: hidden;
            transition: all 0.3s ease;
        }
        #adWrapper > * { max-width: 100%; box-sizing: border-box; }
        .sidebar-hidden #adWrapper { width: 100%; padding-right: 10px; max-width: none; }
        .ad {
            width: 400px; height: 100%;
            pointer-events: auto;
            flex-shrink: 0;
            margin-right: 20px;
        }
        .ad a {
            display: block;
            width: 100%; height: 100%;
            text-decoration: none;
            overflow: hidden;
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0,0,0,.08);
            transition: transform .15s ease, box-shadow .15s ease;
        }
        .ad a:hover, .ad a:focus { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(0,0,0,.12); }
        .ad img { width: 100%; height: 100%; object-fit: cover; display: block; user-select: none; -webkit-user-select: none; }
        .ad a:focus { outline: none; }
        .role { font-size: 10px; color: gray; }
        .user { margin-left: auto; text-align: right; }
        .system { margin-right: auto; }
        .settings-btn {
            background: linear-gradient(180deg, var(--gray), var(--di-bright), var(--cobalt-blue), var(--di-bright));
            color: var(--btn-color);
            text-shadow: var(--btn-shadow);
            width: fit-content;
            border: none;
            border-radius: 10px;
            padding: 10px 22px;
            font-size: 16px;
            line-height: 1;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
            cursor: pointer;
            transition: all 0.2s ease;
            display: inline-block;
            box-shadow: 0 4px 12px var(--box-shadow);
        }
        .settings-btn:hover { transform: translateY(-2px); box-shadow: 0 5px 15px rgba(0,0,0,0.3); }
a {
  color: var(--heading-color);
  text-decoration: none;
  font-weight: 500;
  opacity: 0.85;
  transition: all 0.2s ease;
}
a:hover {
  opacity: 1;
  text-decoration: underline;
}
a:active {
  opacity: 0.7;
}
a:focus {
  outline: none;
}
.checkmark-wrapper {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 9999;
}
.checkmark-circle {
  background: linear-gradient(180deg, var(--gray), var(--di-bright), var(--cobalt-blue), var(--di-bright));
  width: 80px;
  height: 80px;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  box-shadow: 0 4px 12px var(--box-shadow);
  animation: popIn 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
.checkmark-circle::after {
  content: '';
  display: block;
  width: 8px; 
  height: 17px;
  border: solid white;
  border-width: 0 2.5px 2.5px 0; 
  transform: rotate(45deg);
  margin-top: -4px; 
  margin-left: 1px;
}
.hidden {
  opacity: 0;
  pointer-events: none;
  visibility: hidden;
}
textarea {
  width: 100%;
  max-width: 100%;
  min-height: 120px;
  background: var(--textarea-bg);
  border: 1px solid var(--textarea-border);
  border-radius: 8px;
  color: var(--textarea-color);
  font-family: 'Inter', sans-serif;
  font-size: 17px;
  padding: 12px;
  padding-right: 48px;
  backdrop-filter: blur(5px);
  transition: all 0.3s ease;
  resize: vertical;
  box-sizing: border-box;
  display: block;
}
textarea:focus {
  outline: none;
  border-color: var(--di-blue);
  box-shadow: 0 4px 12px var(--box-shadow);
}
.textarea-wrapper {
  position: relative;
  width: 100%;
  max-width: 100%;
}
.attach-btn:hover {
  transform: scale(1.1);
  opacity: 0.9;
}
.attach-btn:active {
  transform: scale(0.95);
}
.attach-btn {
  position: absolute;
  left: 12px;
  bottom: 12px;
  width: 34px; height: 34px;
  font-size: 14px;
  background: linear-gradient(90deg, var(--pure-pink), var(--cobalt-blue), var(--pure-cyan));
  text-shadow: var(--btn-shadow);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  box-shadow: 0 4px 12px var(--box-shadow) !important;
  color: white !important;
  transition: all 0.3s ease !important;
}
.attach-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(0,0,0,0.3);
}