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

:root {
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-success: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    --color-primary: #667eea;
    --color-primary-dark: #5568d3;
    --color-secondary: #f5576c;
    --color-text: #2d3436;
    --color-text-light: #636e72;
    --color-bg: #f8f9fa;
    --color-white: #ffffff;
    --color-success: #38ef7d;
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.15);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html, body {
    width: 100%;
    height: 100%;
}

.watermark {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) rotate(-45deg);
    font-size: 80px;
    color: rgba(0, 0, 0, 0.05);
    pointer-events: none;
    z-index: 0;
    white-space: nowrap;
}
body {
    font-family: var(--font-family);
    color: var(--color-text);
    background: linear-gradient(135deg, #f5f7ff 0%, #fff5f7 50%, #fffbf0 100%);
    padding: 40px 20px 140px 20px; 
    min-height: 100vh;
    background-attachment: fixed;
}

.popup-wrapper {
    max-width: 520px;
    margin: 0 auto;
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 48px 36px;
    position: relative;
    overflow: hidden;
}

.popup-wrapper::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 6px;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

h1 {
    font-size: 32px;
    font-weight: 800;
    text-align: center;
    margin-bottom: 12px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
}

/* eliminate underline from VoltiSmart header link */
.popup-wrapper h1 a {
    text-decoration: none;
    color: inherit; /* keep gradient text style */
}

h2 {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-text);
    margin-top: 24px;
    margin-bottom: 16px;
}

.subtitle {
    text-align: center;
    font-size: 16px;
    color: var(--color-text-light);
    margin-bottom: 32px;
    font-weight: 500;
}

.step {
    display: none;
    animation: slideInUp 0.5s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.step.active {
    display: block;
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.question {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--color-text);
    line-height: 1.4;
}

.options {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 32px;
}

.options button {
    padding: 16px 20px;
    border: 2px solid #e0e6f6;
    background: var(--color-white);
    color: var(--color-text);
    font-size: 16px;
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font-family);
    position: relative;
    overflow: hidden;
}

.options button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    transition: var(--transition);
    z-index: -1;
    border-radius: var(--radius-md);
}

.options button:hover {
    border-color: var(--color-primary);
    color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.3);
}

.options button:hover::before {
    left: 0;
}

.options button:active {
    transform: translateY(0);
}

.btn-primary,
.btn-secondary {
    padding: 14px 28px;
    border: none;
    border-radius: var(--radius-md);
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font-family);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--color-white);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
    width: 100%;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: var(--color-white);
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
    box-shadow: none;
}

.btn-secondary:hover {
    background: linear-gradient(135deg, #667eea15 0%, #764ba215 100%);
    transform: translateY(-2px);
}

.nav-buttons {
    display: flex;
    gap: 12px;
    margin-top: 32px;
}

.nav-buttons .btn-secondary {
    flex: 1;
}

.nav-buttons .btn-primary {
    flex: 1;
}

.info-text {
    font-size: 16px;
    line-height: 1.6;
    margin-bottom: 24px;
    color: var(--color-text-light);
    padding: 20px;
    background: linear-gradient(135deg, #f8f9ff 0%, #fff5f7 100%);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--color-primary);
}

.highlight {
    color: var(--color-text);
    font-weight: 700;
    display: block;
    margin: 8px 0;
}

form {
    margin: 24px 0;
}

.input-group {
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    font-size: 14px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--color-text);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.input-group input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e0e6f6;
    border-radius: var(--radius-md);
    font-size: 16px;
    font-family: var(--font-family);
    transition: var(--transition);
    background: var(--color-white);
}

.input-group input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    background: #fafbff;
}

.error {
    color: #e74c3c;
    font-size: 13px;
    font-weight: 600;
    margin-top: 6px;
    display: none;
}

.input-group input.error-input {
    border-color: #e74c3c;
}

.checkbox-group {
    margin-bottom: 16px;
    padding: 14px;
    background: linear-gradient(135deg, #f8f9ff 0%, #fff5f7 100%);
    border-radius: var(--radius-md);
    border: 1px solid #e0e6f6;
    transition: var(--transition);
    width: 100%;
}

.checkbox-group:hover {
    border-color: var(--color-primary);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.1);
}

.checkbox-group label {
    display: block;
    font-size: 14px;
    color: var(--color-text-light);
    line-height: 1.6;
    cursor: pointer;
    font-weight: 500;
    position: relative;
    padding-left: 28px;
    word-break: break-word;
}

.checkbox-group input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--color-primary);
    position: absolute;
    left: 0;
    top: 2px;
}

.checkbox-group a {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 700;
    transition: var(--transition);
}

.checkbox-group a:hover {
    color: var(--color-primary-dark);
    text-decoration: underline;
}

.processing {
    font-size: 14px;
    text-align: center;
    padding: 16px;
    background: linear-gradient(135deg, #e8f5e9 0%, #f1f8e9 100%);
    border-radius: var(--radius-md);
    color: #2e7d32;
    font-weight: 600;
    margin-top: 16px;
    display: none;
    border-left: 4px solid #4caf50;
}

.spinner {
    margin: 32px auto;
    width: 56px;
    height: 56px;
    border: 4px solid #e0e6f6;
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.footer {
    background: linear-gradient(135deg, #2d3436 0%, #1e272e 100%);
    color: var(--color-white);
    padding: 12px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    width: 100%;
    box-sizing: border-box;
    box-shadow: 0 -2px 15px rgba(0, 0, 0, 0.1);
    z-index: 100;
}

.footer-left {
    font-weight: 600;
    letter-spacing: 0.5px;
}

.footer-right {
    display: flex;
    gap: 16px;
}

.footer a {
    color: var(--color-white);
    text-decoration: none;
    font-weight: 700;
    transition: var(--transition);
    position: relative;
}

.footer a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    transition: var(--transition);
}

.footer a:hover::after {
    width: 100%;
}

.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(3px);
    justify-content: center;
    align-items: center;
    z-index: 1000;
    animation: fadeIn 0.3s ease-in-out;
}

.modal-overlay.show {
    animation: fadeIn 0.3s ease-in-out forwards;
}

.modal-content {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    max-width: 600px;
    width: 90%;
    max-height: 85vh;
    overflow-y: auto;
    padding: 0;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: slideUp 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 28px 32px;
    background: var(--gradient-primary);
    color: var(--color-white);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    position: sticky;
    top: 0;
    z-index: 10;
}

.modal-title {
    font-size: 20px;
    font-weight: 800;
    letter-spacing: 0.5px;
}

.modal-close {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    font-size: 28px;
    cursor: pointer;
    color: var(--color-white);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    font-weight: 300;
}

.modal-close:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: rotate(90deg);
}

.modal-body {
    padding: 36px 32px;
    color: var(--color-text);
    line-height: 1.7;
}

.modal-body h2 {
    font-size: 18px;
    margin-top: 28px;
    margin-bottom: 14px;
    color: var(--color-primary);
    border-bottom: 2px solid #e0e6f6;
    padding-bottom: 10px;
}

.modal-body p {
    margin-bottom: 16px;
    color: var(--color-text-light);
    font-size: 15px;
}

.modal-body a {
    color: var(--color-primary);
    font-weight: 700;
    text-decoration: none;
    transition: var(--transition);
}

.modal-body a:hover {
    color: var(--color-primary-dark);
    text-decoration: underline;
}

.sponsors-description {
    padding: 16px;
    background: linear-gradient(135deg, #f8f9ff 0%, #fff5f7 100%);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--color-primary);
    margin-bottom: 24px;
    font-size: 15px;
    line-height: 1.6;
}

.sponsors-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 28px;
}

.sponsor-item {
    display: flex;
    align-items: flex-start;
    padding: 14px;
    background: var(--color-white);
    border: 2px solid #e0e6f6;
    border-radius: var(--radius-md);
    transition: var(--transition);
    cursor: pointer;
}

.sponsor-item:hover {
    border-color: var(--color-primary);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.1);
    background: #f8f9ff;
}

.sponsor-item input[type="checkbox"] {
    width: 18px;
    height: 18px;
    margin-right: 12px;
    margin-top: 2px;
    cursor: pointer;
    accent-color: var(--color-primary);
    flex-shrink: 0;
}

.sponsor-item label {
    display: flex;
    flex-direction: column;
    cursor: pointer;
    flex: 1;
}

.sponsor-link {
    font-size: 13px;
    margin-top: 6px;
    display: block;
}

.sponsor-link a {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

.sponsor-link a:hover {
    color: var(--color-primary-dark);
    text-decoration: underline;
}

.sponsors-buttons {
    display: flex;
    gap: 12px;
    justify-content: space-between;
}

.sponsors-buttons button {
    flex: 1;
    padding: 12px 16px;
    border: 2px solid var(--color-primary);
    background: var(--color-white);
    color: var(--color-primary);
    font-weight: 700;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.sponsors-buttons button:hover {
    background: linear-gradient(135deg, #667eea15 0%, #764ba215 100%);
    transform: translateY(-2px);
}

.sponsors-buttons button:last-child {
    background: var(--gradient-primary);
    color: var(--color-white);
    border-color: var(--color-primary);
}

.sponsors-buttons button:last-child:hover {
    background: linear-gradient(135deg, #5568d3 0%, #6a3a91 100%);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

@media (max-width: 768px) {
    .popup-wrapper {
        padding: 36px 24px;
        margin: 0 16px;
    }

    h1 {
        font-size: 28px;
    }

    .question {
        font-size: 16px;
    }

    .options button {
        padding: 14px 16px;
        font-size: 15px;
    }

    .btn-primary,
    .btn-secondary {
        padding: 12px 20px;
    }

    .nav-buttons {
        flex-direction: column;
        gap: 12px;
    }

    .footer {
        flex-direction: column;
        gap: 16px;
        padding: 16px;
        text-align: center;
    }

    .footer-right {
        gap: 8px;
        font-size: 12px;
    }

    .modal-header {
        padding: 20px 24px;
    }

    .modal-body {
        padding: 24px;
    }

    .modal-title {
        font-size: 18px;
    }
}

@media (max-width: 520px) {
    body {
        padding: 30px 16px 130px 16px;
    }

    .popup-wrapper {
        padding: 32px 20px;
        border-radius: 12px;
    }

    h1 {
        font-size: 24px;
        margin-bottom: 8px;
    }

    .subtitle {
        font-size: 14px;
        margin-bottom: 24px;
    }

    .question {
        font-size: 15px;
        margin-bottom: 16px;
    }

    .options {
        gap: 10px;
        margin-bottom: 24px;
    }

    .options button {
        padding: 12px 14px;
        font-size: 14px;
    }

    .info-text {
        font-size: 14px;
        padding: 16px;
        margin-bottom: 16px;
    }

    .input-group label {
        font-size: 12px;
    }

    .checkbox-group {
        padding: 12px;
        margin-bottom: 12px;
    }

    .checkbox-group label {
        font-size: 13px;
    }

    .modal-content {
        width: 95%;
        max-height: 90vh;
        border-radius: 12px;
    }

    .modal-header {
        padding: 16px 20px;
    }

    .modal-body {
        padding: 20px;
    }

    .modal-title {
        font-size: 16px;
    }

    .sponsors-buttons {
        flex-direction: column;
    }

    .sponsors-buttons button {
        padding: 10px 12px;
        font-size: 13px;
    }

    .footer {
        padding: 12px;
        font-size: 11px;
    }

    .footer-right {
        flex-direction: column;
        gap: 4px;
    }
}