:root {
            --bg-ground: #090d16;
            --surface-card: #111827;
            --surface-subtle: #162032;
            --surface-input: #0b0f19;
            --border-subtle: rgba(255, 255, 255, 0.08);
            --border-hover: rgba(255, 255, 255, 0.16);
            --border-focus: #3b82f6;
            --text-primary: #f8fafc;
            --text-secondary: #94a3b8;
            --text-tertiary: #64748b;
            --brand-accent: #2563eb;
            --brand-accent-hover: #1d4ed8;
            --brand-accent-soft: rgba(37, 99, 235, 0.15);
            --brand-emerald: #10b981;
            --brand-emerald-soft: rgba(16, 185, 129, 0.12);
            --brand-emerald-border: rgba(16, 185, 129, 0.28);
            --btn-primary-bg: #2563eb;
            --btn-primary-text: #ffffff;
            --btn-primary-hover: #1d4ed8;
            --btn-secondary-bg: #162032;
            --btn-secondary-hover: #1e2d45;
            --status-danger-bg: rgba(248, 113, 113, 0.14);
            --status-danger-border: rgba(248, 113, 113, 0.35);
            --status-danger-text: #f87171;
            --status-warn-bg: rgba(245, 158, 11, 0.14);
            --status-warn-border: rgba(245, 158, 11, 0.35);
            --status-warn-text: #f59e0b;
            --status-success-bg: rgba(16, 185, 129, 0.14);
            --status-success-border: rgba(16, 185, 129, 0.35);
            --status-success-text: #34d399;
            --font-display: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
            --font-sans: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
        }

        *, *::before, *::after {
            box-sizing: border-box;
        }

        *:focus-visible {
            outline: 2px solid var(--border-focus);
            outline-offset: 2px;
        }

        @media (prefers-reduced-motion: reduce) {
            *, *::before, *::after {
                animation-duration: 0.01ms !important;
                animation-iteration-count: 1 !important;
                transition-duration: 0.01ms !important;
                scroll-behavior: auto !important;
            }
        }

        body {
            margin: 0;
            padding: 0;
            font-family: var(--font-sans);
            background-color: var(--bg-ground);
            color: var(--text-primary);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            background-image: none;
        }

        .auth-layout {
            flex: 1;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 32px 20px;
            width: 100%;
        }

        .auth-split-wrapper {
            width: 100%;
            max-width: 1100px;
            display: grid;
            grid-template-columns: 1fr;
            gap: 40px;
            align-items: center;
        }

        @media (min-width: 900px) {
            .auth-split-wrapper {
                grid-template-columns: 1.15fr 0.95fr;
                gap: 56px;
                padding: 24px 0;
            }
        }

        /* Left Column: E-Commerce Hero & Social Proof */
        .ecom-hero-panel {
            display: flex;
            flex-direction: column;
            gap: 24px;
        }

        .brand-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 14px;
            background: var(--brand-emerald-soft);
            border: 1px solid var(--brand-emerald-border);
            border-radius: 9999px;
            font-size: 13px;
            font-weight: 600;
            color: #34d399;
            width: fit-content;
        }

        .hero-title {
            font-family: var(--font-display);
            font-size: clamp(28px, 4vw, 38px);
            font-weight: 800;
            line-height: 1.18;
            letter-spacing: -0.025em;
            color: #ffffff;
            margin: 0;
        }


        .hero-subtitle {
            font-size: 16px;
            line-height: 1.6;
            color: var(--text-secondary);
            margin: 0;
            max-width: 520px;
        }

        .hero-features {
            display: flex;
            flex-direction: column;
            gap: 14px;
            margin-top: 4px;
        }

        .feature-item {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            font-size: 14px;
            line-height: 1.5;
            color: var(--text-secondary);
        }

        .feature-item strong {
            color: var(--text-primary);
        }

.feature-icon-bubble {
            width: 28px;
            height: 28px;
            border-radius: 8px;
            background: var(--surface-subtle);
            border: 1px solid var(--border-subtle);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-secondary);
            flex-shrink: 0;
        }

        .feature-icon-bubble svg {
            width: 15px;
            height: 15px;
        }

        /* Testimonial Quote Box */
        .testimonial-card {
            background: linear-gradient(180deg, rgba(22, 32, 50, 0.7) 0%, rgba(17, 24, 39, 0.7) 100%);
            border: 1px solid rgba(255, 255, 255, 0.09);
            border-radius: 12px;
            padding: 18px 20px;
            margin-top: 8px;
            position: relative;
        }

        .testimonial-text {
            font-size: 14px;
            line-height: 1.55;
            color: #e2e8f0;
            font-style: italic;
            margin: 0 0 12px 0;
        }

        .testimonial-author {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .author-avatar {
            width: 32px;
            height: 32px;
            border-radius: 50%;
            background: linear-gradient(135deg, #3b82f6, #10b981);
            color: #ffffff;
            font-weight: 700;
            font-size: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .author-info {
            display: flex;
            flex-direction: column;
            font-size: 13px;
        }

        .author-name {
            font-weight: 600;
            color: #ffffff;
        }

        .author-role {
            font-size: 12px;
            color: var(--text-tertiary);
        }

        .trust-badges-bar {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 8px 16px;
            font-size: 13px;
            font-weight: 500;
            color: var(--text-tertiary);
            padding-top: 4px;
        }

        /* Right Column: Auth Card Container */
        .auth-card-wrapper {
            width: 100%;
            max-width: 440px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .auth-header {
            text-align: left;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .brand-logo-wrap {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 10px;
            background: var(--brand-accent-soft);
            color: #60a5fa;
            border: 1px solid rgba(37, 99, 235, 0.25);
            margin-bottom: 4px;
        }

        .brand-logo-wrap svg {
            width: 22px;
            height: 22px;
        }

        .auth-headline {
            font-family: var(--font-display);
            font-size: 24px;
            font-weight: 700;
            line-height: 1.25;
            color: var(--text-primary);
            margin: 0;
            letter-spacing: -0.02em;
        }

        .auth-subheadline {
            font-size: 14px;
            line-height: 1.5;
            color: var(--text-secondary);
            margin: 0;
        }

        .auth-card {
            background: var(--surface-card);
            border: 1px solid var(--border-subtle);
            border-radius: 14px;
            padding: 24px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.35);
            display: flex;
            flex-direction: column;
            gap: 18px;
        }

        /* Segmented tab switcher */
        .tab-switcher {
            display: flex;
            background: var(--surface-subtle);
            border: 1px solid var(--border-subtle);
            border-radius: 8px;
            padding: 3px;
            gap: 2px;
        }

        .tab-btn {
            flex: 1;
            background: transparent;
            border: none;
            color: var(--text-secondary);
            padding: 7px 10px;
            font-family: var(--font-sans);
            font-size: 13px;
            font-weight: 500;
            border-radius: 6px;
            cursor: pointer;
            transition: color 0.15s ease, background-color 0.15s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
        }

        .tab-btn:hover {
            color: var(--text-primary);
        }

        .tab-btn.active {
            background: var(--surface-card);
            color: var(--text-primary);
            font-weight: 600;
            border: 1px solid var(--border-subtle);
            box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
        }

        /* Social login button */
        .social-auth-section {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .btn-google {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            width: 100%;
            background: var(--btn-secondary-bg);
            border: 1px solid var(--border-subtle);
            border-radius: 8px;
            padding: 10px 16px;
            font-family: var(--font-sans);
            font-size: 14px;
            font-weight: 500;
            color: var(--text-primary);
            cursor: pointer;
            transition: background-color 0.15s ease, border-color 0.15s ease;
            text-decoration: none;
        }

        .btn-google:hover {
            background: var(--btn-secondary-hover);
            border-color: var(--border-hover);
        }

        .google-icon {
            width: 18px;
            height: 18px;
            flex-shrink: 0;
        }

        /* Divider */
        .auth-divider {
            display: flex;
            align-items: center;
            text-align: center;
            color: var(--text-tertiary);
            font-size: 12px;
        }

        .auth-divider::before,
        .auth-divider::after {
            content: '';
            flex: 1;
            border-bottom: 1px solid var(--border-subtle);
        }

        .auth-divider:not(:empty)::before {
            margin-right: 12px;
        }

        .auth-divider:not(:empty)::after {
            margin-left: 12px;
        }

        /* Forms */
        .auth-form-pane {
            display: none;
            flex-direction: column;
            gap: 16px;
        }

        .auth-form-pane.active {
            display: flex;
        }

        .form-group {
            display: flex;
            flex-direction: column;
            gap: 6px;
        }

        .form-label {
            font-size: 13px;
            font-weight: 500;
            color: var(--text-primary);
        }

        .form-label-row {
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .forgot-password-link {
            font-size: 12px;
            color: #60a5fa;
            text-decoration: none;
            font-weight: 500;
            transition: color 0.15s ease;
        }

        .forgot-password-link:hover {
            text-decoration: underline;
        }

        .input-wrap {
            position: relative;
            display: flex;
            align-items: center;
        }

        .text-input {
            width: 100%;
            background: var(--surface-input);
            border: 1px solid var(--border-subtle);
            border-radius: 8px;
            padding: 10px 38px 10px 12px;
            font-family: var(--font-sans);
            font-size: 14px;
            color: var(--text-primary);
            transition: border-color 0.15s ease, box-shadow 0.15s ease;
        }

        .text-input.mono {
            font-family: var(--font-mono);
            font-size: 13px;
        }

        .text-input:hover {
            border-color: var(--border-hover);
        }

        .text-input:focus {
            outline: none;
            border-color: var(--border-focus);
            box-shadow: 0 0 0 1px var(--border-focus);
        }

        .pw-toggle-btn {
            position: absolute;
            right: 6px;
            background: none;
            border: none;
            color: var(--text-secondary);
            cursor: pointer;
            padding: 6px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 4px;
            transition: color 0.15s ease;
        }

        .pw-toggle-btn:hover {
            color: var(--text-primary);
        }

        .btn-submit {
            width: 100%;
            background: var(--btn-primary-bg);
            color: var(--btn-primary-text);
            border: none;
            border-radius: 8px;
            padding: 11px 16px;
            font-family: var(--font-sans);
            font-size: 14px;
            font-weight: 600;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
            transition: background-color 0.15s ease;
            margin-top: 4px;
        }

        .btn-submit:hover {
            background: var(--btn-primary-hover);
        }

        .btn-submit:disabled {
            opacity: 0.6;
            cursor: not-allowed;
        }

        /* Alert notifications */
        .alert-banner,
        .alert-box {
            padding: 11px 14px;
            border-radius: 8px;
            font-size: 13px;
            line-height: 1.45;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }

        .alert-banner.danger,
        .alert-box.alert-danger {
            background: var(--status-danger-bg);
            border: 1px solid var(--status-danger-border);
            color: var(--status-danger-text);
        }

        .alert-banner.warning,
        .alert-box.alert-warning {
            background: var(--status-warn-bg);
            border: 1px solid var(--status-warn-border);
            color: var(--status-warn-text);
        }

        .alert-banner.success,
        .alert-box.alert-success {
            background: var(--status-success-bg);
            border: 1px solid var(--status-success-border);
            color: var(--status-success-text);
        }

        .alert-row {
            display: flex;
            align-items: center;
            gap: 8px;
            font-weight: 500;
        }

        /* Switch prompt link */
        .switch-prompt {
            font-size: 13px;
            text-align: center;
            color: var(--text-secondary);
            margin: 4px 0 0 0;
        }

        .switch-prompt a {
            color: #60a5fa;
            text-decoration: none;
            font-weight: 500;
        }

        .switch-prompt a:hover {
            text-decoration: underline;
        }

        /* Footer */
        .auth-footer {
            margin-top: 8px;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 10px;
            font-size: 12px;
            color: var(--text-tertiary);
        }

        .footer-nav {
            display: flex;
            align-items: center;
            gap: 16px;
        }

        .footer-nav a {
            color: var(--text-secondary);
            text-decoration: none;
            transition: color 0.15s ease;
        }

        .footer-nav a:hover {
            color: var(--text-primary);
        }

        .client-ip-info {
            font-family: var(--font-mono);
            font-size: 11px;
            color: var(--text-tertiary);
        }