:root {
            --bg: #111315;
            --panel: #191c20;
            --line: rgba(255, 255, 255, 0.08);
            --text: #f3f5f7;
            --muted: #99a3ad;
            --accent: #7ddc84;
            --info: #67c6ff;
            --panel-soft: rgba(255, 255, 255, 0.035);
        }

        body {
            background:
                radial-gradient(circle at top right, rgba(125, 220, 132, 0.14), transparent 24rem),
                radial-gradient(circle at bottom left, rgba(103, 198, 255, 0.12), transparent 22rem),
                var(--bg);
            color: var(--text);
            min-height: 100vh;
            display: flex;
            align-items: center;
        }

        .auth-shell {
            width: min(100%, 520px);
            margin: 0 auto;
            padding: 1rem;
        }

        .glass-card {
            background: linear-gradient(180deg, rgba(32, 36, 42, 0.98), rgba(25, 28, 32, 0.94));
            border: 1px solid var(--line);
            border-radius: 1.2rem;
            box-shadow: 0 1.5rem 3rem rgba(0, 0, 0, 0.22);
        }

        .eyebrow {
            text-transform: uppercase;
            letter-spacing: 0.16em;
            color: var(--muted);
            font-size: 0.74rem;
        }

        .impact {
            font-size: clamp(1.8rem, 6vw, 2.7rem);
            font-weight: 800;
            line-height: 1.05;
        }

        .feedback-banner {
            display: none;
            background: rgba(255, 107, 107, 0.12);
            border: 1px solid rgba(255, 107, 107, 0.3);
            border-radius: 1rem;
            color: #ffd7d7;
            padding: 0.9rem 1rem;
        }

        .auth-tabs {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 0.75rem;
        }

        .auth-tab {
            min-height: 48px;
            border-radius: 1rem;
            border: 1px solid var(--line);
            background: rgba(255, 255, 255, 0.03);
            color: var(--text);
            font-weight: 700;
        }

        .auth-tab.active {
            background: rgba(103, 198, 255, 0.18);
            border-color: rgba(103, 198, 255, 0.5);
        }

        .auth-pane {
            display: none;
        }

        .auth-pane.active {
            display: block;
        }

        .google-btn {
            min-height: 68px;
            border-radius: 1rem;
            font-weight: 700;
            border: 1px solid rgba(255, 255, 255, 0.12);
            background: linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.02));
            color: var(--text);
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 1rem;
            padding: 0.95rem 1rem;
            text-decoration: none;
            transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
        }

        .google-btn:hover,
        .google-btn:focus {
            color: var(--text);
            border-color: rgba(103, 198, 255, 0.35);
            box-shadow: 0 1rem 2rem rgba(0, 0, 0, 0.22);
            transform: translateY(-1px);
        }

        .google-mark {
            width: 2.75rem;
            height: 2.75rem;
            border-radius: 0.9rem;
            background: rgba(255, 255, 255, 0.96);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            flex: 0 0 auto;
        }

        .google-mark img {
            width: 1.35rem;
            height: 1.35rem;
        }

        .google-copy {
            flex: 1;
            min-width: 0;
        }

        .google-copy small {
            display: block;
            color: var(--muted);
            font-weight: 500;
            line-height: 1.35;
        }

        .auth-benefits {
            display: grid;
            gap: 0.75rem;
        }

        .auth-benefit {
            background: var(--panel-soft);
            border: 1px solid var(--line);
            border-radius: 1rem;
            padding: 0.9rem 1rem;
            display: flex;
            align-items: flex-start;
            gap: 0.75rem;
        }

        .auth-benefit i {
            color: var(--accent);
            font-size: 1.1rem;
        }

        .or-divider {
            display: flex;
            align-items: center;
            gap: 0.9rem;
            color: var(--muted);
            font-size: 0.85rem;
            text-transform: uppercase;
            letter-spacing: 0.14em;
        }

        .or-divider::before,
        .or-divider::after {
            content: "";
            flex: 1;
            height: 1px;
            background: var(--line);
        }