:root {
            --bg: #a7acb4;
            --panel: #ffffff;
            --soft: #f4f7f3;
            --text: #15191f;
            --muted: #677281;
            --line: #d0d8d2;
            --accent: #12151a;
            --accent-2: #2d3239;
            --danger: #dc2626;
            --danger-bg: #fee2e2;
        }

        * { box-sizing: border-box; margin: 0; padding: 0; }

        body {
            min-height: 100vh;
            font-family: "Manrope", sans-serif;
            color: var(--text);
            background:
                radial-gradient(circle at 10% 0%, #c6ccd5 0, transparent 36%),
                radial-gradient(circle at 100% 100%, #b8bec7 0, transparent 34%),
                var(--bg);
            display: grid;
            place-items: center;
            padding: 24px;
        }

        .login-shell {
            width: min(1040px, 100%);
            border: 1px solid var(--line);
            border-radius: 26px;
            background: var(--panel);
            box-shadow: 0 28px 58px rgba(31, 36, 45, 0.2);
            display: grid;
            grid-template-columns: 1.15fr 1fr;
            overflow: hidden;
            min-height: 640px;
        }

        .login-art {
            background:
                linear-gradient(155deg, #eef4ef 0%, #e3ebe5 100%);
            border-right: 1px solid var(--line);
            padding: 40px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            position: relative;
        }

        .brand {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .brand-mark {
            width: 40px;
            height: 40px;
            border-radius: 12px;
            background: linear-gradient(135deg, var(--accent), var(--accent-2));
            box-shadow: 0 12px 24px rgba(17, 20, 26, 0.28);
        }

        .brand-title {
            font-family: "Sora", sans-serif;
            font-size: 24px;
            font-weight: 700;
            letter-spacing: -0.03em;
        }

        .brand-sub {
            color: var(--muted);
            font-size: 13px;
        }

        .art-copy h2 {
            font-family: "Sora", sans-serif;
            font-size: clamp(28px, 3vw, 42px);
            letter-spacing: -0.03em;
            line-height: 1.1;
            margin-bottom: 16px;
        }

        .art-copy p {
            color: #475569;
            max-width: 360px;
            font-size: 15px;
            line-height: 1.6;
        }

        .art-metrics {
            display: grid;
            grid-template-columns: repeat(3, minmax(0, 1fr));
            gap: 10px;
        }

        .art-metric {
            background: rgba(255, 255, 255, 0.86);
            border: 1px solid #d8e3fc;
            border-radius: 14px;
            padding: 12px;
        }

        .art-metric .v {
            font-family: "Sora", sans-serif;
            font-size: 24px;
            font-weight: 700;
            line-height: 1;
        }

        .art-metric .l {
            margin-top: 6px;
            color: var(--muted);
            font-size: 12px;
            text-transform: uppercase;
            letter-spacing: 0.06em;
            font-weight: 700;
        }

        .login-form-wrap {
            padding: 44px;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }

        .form-title {
            font-family: "Sora", sans-serif;
            font-size: 32px;
            letter-spacing: -0.03em;
            margin-bottom: 6px;
        }

        .form-subtitle {
            color: var(--muted);
            margin-bottom: 26px;
        }

        .form-group {
            margin-bottom: 16px;
        }

        .form-label {
            display: block;
            margin-bottom: 6px;
            font-size: 13px;
            font-weight: 700;
            color: #374151;
        }

        .form-input {
            width: 100%;
            min-height: 46px;
            padding: 12px 14px;
            border: 1px solid var(--line);
            border-radius: 12px;
            background: #fff;
            color: var(--text);
            font: inherit;
        }

        .form-input:focus {
            outline: none;
            border-color: var(--accent);
            box-shadow: 0 0 0 4px rgba(91, 104, 126, 0.17);
        }

        .error-message {
            background: var(--danger-bg);
            border: 1px solid #fecaca;
            color: var(--danger);
            border-radius: 12px;
            padding: 12px;
            font-size: 13px;
            margin-bottom: 14px;
            display: none;
        }

        .error-message.visible {
            display: block;
        }

        .submit-btn {
            width: 100%;
            min-height: 46px;
            border: 0;
            border-radius: 12px;
            color: #fff;
            font: inherit;
            font-weight: 800;
            background: linear-gradient(135deg, var(--accent), var(--accent-2));
            cursor: pointer;
            box-shadow: 0 12px 24px rgba(18, 22, 28, 0.28);
        }

        .submit-btn:disabled {
            opacity: 0.72;
            cursor: not-allowed;
            box-shadow: none;
        }

        .loading {
            display: inline-block;
            width: 16px;
            height: 16px;
            border: 2px solid rgba(255,255,255,0.3);
            border-radius: 50%;
            border-top-color: white;
            animation: spin 0.6s linear infinite;
            margin-right: 8px;
            vertical-align: middle;
        }

        @keyframes spin {
            to { transform: rotate(360deg); }
        }

        @media (max-width: 980px) {
            .login-shell {
                grid-template-columns: 1fr;
                min-height: 0;
            }

            .login-art {
                border-right: 0;
                border-bottom: 1px solid var(--line);
                padding: 24px;
                gap: 24px;
            }

            .login-form-wrap {
                padding: 26px 22px;
            }

            .form-title {
                font-size: 26px;
            }
        }

        @media (max-width: 480px) {
            body {
                padding: 12px;
            }

            .art-metrics {
                grid-template-columns: 1fr;
            }
        }