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

        body {
            font-family: "Inter", system-ui, sans-serif;
            background: radial-gradient(circle at 20% 20%, #1b1b33, #0e0e1a 70%);
            min-height: 100vh;
            color: #e4e4e7;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 24px 0;
        }

        .signup-wrapper {
            display: grid;
            grid-template-columns: 1fr 1fr;
            background: rgba(255, 255, 255, 0.03);
            backdrop-filter: blur(20px);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: 24px;
            overflow: hidden;
            width: 90%;
            max-width: 960px;
            box-shadow: 0 0 60px rgba(99, 102, 241, 0.1);
            animation: fadeIn 0.8s ease;
        }

        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(20px);
            }

            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        /* ── Left Column ── */
        .left-column {
            background: #1a1a2e;
            color: #fff;
            padding: 60px;
            display: flex;
            flex-direction: column;
            justify-content: center;
            position: relative;
        }

        .branding-content {
            position: relative;
            z-index: 1;
            max-width: 420px;
        }

       .brand-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 32px;
}

.logo-icon {
            height: 84px;
            width: auto;
            display: block;
            transform: translateY(3px);
        }

.brand-name {
    font-size: 28px;
    font-weight: 700;
    line-height: 44px;
}

        .brand-title {
            font-size: 30px;
            font-weight: 800;
            line-height: 1.3;
            margin-bottom: 16px;
        }

        .brand-subtitle {
            font-size: 15px;
            opacity: 0.85;
            line-height: 1.6;
            margin-bottom: 28px;
        }

        .feature-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }

        .feature-item {
            font-size: 15px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        /* steps / progress teaser */
        .steps-teaser {
            margin-top: 36px;
            padding-top: 28px;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
        }

        .steps-label {
            font-size: 12px;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.08em;
            color: #a5b4fc;
            margin-bottom: 14px;
        }

        .steps-list {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

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

        .step-dot {
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: linear-gradient(135deg, #6366f1, #8b5cf6);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 12px;
            font-weight: 700;
            flex-shrink: 0;
        }

        .step-text {
            font-size: 13px;
            opacity: 0.8;
        }

        /* ── Right Column ── */
        .right-column {
            padding: 50px 50px;
            background: rgba(255, 255, 255, 0.02);
            display: flex;
            flex-direction: column;
            justify-content: center;
        }

        .signup-container {
            width: 100%;
            max-width: 380px;
            margin: 0 auto;
        }

        .signup-title {
            font-size: 26px;
            font-weight: 700;
            margin-bottom: 6px;
            color: #fafafa;
        }

        .signup-subtitle {
            font-size: 14px;
            color: #a1a1aa;
            margin-bottom: 28px;
        }

        /* form row for side-by-side */
        .form-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 12px;
        }

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

        .form-label {
            font-size: 13px;
            font-weight: 600;
            margin-bottom: 6px;
            display: block;
            color: #d4d4d8;
        }

        .form-input,
        .form-select {
            width: 100%;
            padding: 13px 16px;
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: 10px;
            color: #fafafa;
            font-size: 14px;
            transition: all 0.25s ease;
            outline: none;
            font-family: inherit;
        }

        .form-input::placeholder {
            color: #52525b;
        }

        .form-input:focus,
        .form-select:focus {
            border-color: #6366f1;
            box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
            background: rgba(99, 102, 241, 0.05);
        }

        /* invalid state */
        .form-input.invalid,
        .form-select.invalid {
            border-color: #f87171;
            box-shadow: 0 0 0 3px rgba(248, 113, 113, 0.12);
        }

        .error-msg {
            font-size: 11.5px;
            color: #f87171;
            margin-top: 4px;
            display: none;
        }

        .form-group.has-error .error-msg {
            display: block;
        }

        /* select styling */
        .form-select {
            appearance: none;
            -webkit-appearance: none;
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='none' viewBox='0 0 24 24'%3E%3Cpath stroke='%236366f1' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
            background-repeat: no-repeat;
            background-position: right 14px center;
            padding-right: 42px;
            cursor: pointer;
        }

        .form-select option {
            background: #1a1a2e;
            color: #fafafa;
        }

        /* password wrapper */
        .password-wrapper {
            position: relative;
        }

        .password-wrapper .form-input {
            padding-right: 46px;
        }

        .toggle-password {
            position: absolute;
            right: 14px;
            top: 50%;
            transform: translateY(-50%);
            background: none;
            border: none;
            cursor: pointer;
            color: #71717a;
            font-size: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: color 0.2s;
            padding: 0;
            line-height: 1;
        }

        .toggle-password:hover {
            color: #a5b4fc;
        }

        /* password strength */
        .strength-bar-wrap {
            margin-top: 8px;
            display: flex;
            gap: 4px;
        }

        .strength-segment {
            height: 3px;
            flex: 1;
            border-radius: 99px;
            background: rgba(255, 255, 255, 0.08);
            transition: background 0.35s ease;
        }

        .strength-segment.active-weak {
            background: #f87171;
        }

        .strength-segment.active-fair {
            background: #fb923c;
        }

        .strength-segment.active-good {
            background: #facc15;
        }

        .strength-segment.active-strong {
            background: #4ade80;
        }

        .strength-hint {
            font-size: 11.5px;
            color: #71717a;
            margin-top: 4px;
        }

        /* terms */
        .terms-group {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            margin-bottom: 20px;
        }

        .checkbox-input {
            width: 18px;
            height: 18px;
            accent-color: #6366f1;
            cursor: pointer;
            flex-shrink: 0;
            margin-top: 1px;
        }

        .terms-label {
            font-size: 13px;
            color: #a1a1aa;
            line-height: 1.5;
        }

        .terms-link {
            color: #a5b4fc;
            text-decoration: none;
            font-weight: 600;
        }

        /* submit button */
        .signup-button {
            background: linear-gradient(135deg, #6366f1, #8b5cf6);
            color: #fff;
            border: none;
            padding: 14px;
            width: 100%;
            border-radius: 10px;
            font-size: 15px;
            font-weight: 600;
            cursor: pointer;
            transition:
                transform 0.2s ease,
                box-shadow 0.2s ease,
                opacity 0.2s;
            box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
            position: relative;
            overflow: hidden;
            font-family: inherit;
        }

        .signup-button:hover:not(:disabled) {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
        }

        .signup-button:disabled {
            opacity: 0.6;
            cursor: not-allowed;
        }

        /* loading spinner inside button */
        .btn-spinner {
            display: inline-block;
            width: 16px;
            height: 16px;
            border: 2px solid rgba(255, 255, 255, 0.35);
            border-top-color: #fff;
            border-radius: 50%;
            animation: spin 0.7s linear infinite;
            vertical-align: middle;
            margin-right: 8px;
        }

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

        .signup-footer {
            margin-top: 24px;
            font-size: 13px;
            text-align: center;
            color: #a1a1aa;
        }

        .login-link {
            color: #a5b4fc;
            text-decoration: none;
            font-weight: 600;
        }

        /* success overlay */
        .success-overlay {
            display: none;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            text-align: center;
            gap: 12px;
            padding: 20px 0;
        }

        .success-overlay.visible {
            display: flex;
        }

        .success-icon {
            width: 64px;
            height: 64px;
            background: linear-gradient(135deg, #6366f1, #8b5cf6);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 30px;
            animation: popIn 0.45s cubic-bezier(0.34, 1.56, 0.64, 1);
        }

        @keyframes popIn {
            from {
                transform: scale(0);
                opacity: 0;
            }

            to {
                transform: scale(1);
                opacity: 1;
            }
        }

        .success-title {
            font-size: 22px;
            font-weight: 700;
            color: #fafafa;
        }

        .success-sub {
            font-size: 14px;
            color: #a1a1aa;
            line-height: 1.6;
        }

        /* ── Responsive ── */
        @media (max-width: 768px) {
            body {
                padding: 0;
                align-items: flex-start;
            }

            .signup-wrapper {
                grid-template-columns: 1fr;
                border-radius: 0;
                width: 100%;
                min-height: 100vh;
            }

            .left-column {
                padding: 32px 24px 28px;
                text-align: center;
            }

            .brand-logo {
                justify-content: center;
            }

            .branding-content {
                max-width: 100%;
            }

            .brand-title {
                font-size: 22px;
            }

            .feature-list,
            .steps-teaser {
                display: none;
            }

            .brand-subtitle {
                font-size: 14px;
                margin-bottom: 0;
            }

            .right-column {
                padding: 32px 24px 40px;
            }

            .form-row {
                grid-template-columns: 1fr;
                gap: 0;
            }
        }