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

:root {
    --green-dark: #1a3d2e;
    --green-primary: #2d5a45;
    --green-medium: #3d7a5c;
    --green-light: #4a9268;
    --green-accent: #5cb87a;
    --green-pale: #e8f5ec;
    --white: #fafafa;
    --gray-light: #f5f5f5;
    --gray-medium: #9ca3af;
    --gray-dark: #4b5563;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--green-dark);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    line-height: 1.6;
}

.form-container {
    width: 100%;
    max-width: 600px;
    min-height: 500px;
    display: flex;
    flex-direction: column;
}

/* Progress Bar */
.progress-bar {
    width: 100%;
    height: 4px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 2px;
    margin-bottom: 12px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--green-accent);
    border-radius: 2px;
    transition: width 0.4s ease;
    width: 20%;
}

.progress-text {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.875rem;
    margin-bottom: 40px;
    text-align: right;
}

/* Form Steps */
.form-step {
    display: none;
    animation: fadeIn 0.4s ease;
}

.form-step.active {
    display: block;
}

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

.step-content {
    background: var(--white);
    border-radius: 16px;
    padding: 48px 40px;
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.15);
}

/* Typography */
h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--green-dark);
    margin-bottom: 16px;
}

h2 {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--green-dark);
    margin-bottom: 32px;
}

.step-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

/* Input Groups */
.input-group {
    margin-bottom: 24px;
}

.input-group label {
    display: block;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.input-group label .optional {
    font-weight: 400;
    color: var(--gray-medium);
    font-size: 0.875rem;
}

.input-group input,
.input-group textarea {
    width: 100%;
    padding: 14px 16px;
    font-size: 1rem;
    font-family: inherit;
    border: 2px solid #e5e7eb;
    border-radius: 10px;
    background: var(--white);
    color: var(--text-primary);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.input-group input:focus,
.input-group textarea:focus {
    outline: none;
    border-color: var(--green-primary);
    box-shadow: 0 0 0 3px rgba(45, 90, 69, 0.1);
}

.input-group input::placeholder,
.input-group textarea::placeholder {
    color: var(--gray-medium);
}

.input-group textarea {
    resize: vertical;
    min-height: 100px;
}

/* Consent Groups */
.consent-group {
    margin-bottom: 16px;
}

.checkbox-label {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    cursor: pointer;
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.checkbox-label input[type="checkbox"] {
    appearance: none;
    -webkit-appearance: none;
    width: 22px;
    height: 22px;
    min-width: 22px;
    border: 2px solid #d1d5db;
    border-radius: 6px;
    cursor: pointer;
    position: relative;
    transition: all 0.2s;
}

.checkbox-label input[type="checkbox"]:checked {
    background: var(--green-primary);
    border-color: var(--green-primary);
}

.checkbox-label input[type="checkbox"]:checked::after {
    content: '';
    position: absolute;
    left: 6px;
    top: 2px;
    width: 6px;
    height: 12px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

/* Buttons */
.nav-buttons {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 32px;
    gap: 16px;
}

button {
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    padding: 14px 32px;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-next,
.btn-submit {
    background: var(--green-primary);
    color: white;
    border: none;
    flex: 1;
    max-width: 200px;
}

.btn-next:hover,
.btn-submit:hover {
    background: var(--green-medium);
    transform: translateY(-1px);
}

.btn-back {
    background: transparent;
    color: var(--text-secondary);
    border: 2px solid #e5e7eb;
}

.btn-back:hover {
    border-color: var(--gray-medium);
    color: var(--text-primary);
}

/* Welcome page single button */
.form-step[data-step="1"] .btn-next {
    max-width: none;
    width: 100%;
}

/* Success Page */
.success-content {
    text-align: center;
    padding: 60px 40px;
}

.success-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 24px;
    background: var(--green-pale);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.success-icon svg {
    width: 40px;
    height: 40px;
    color: var(--green-primary);
}

.success-content h2 {
    color: var(--green-dark);
    margin-bottom: 12px;
}

.success-content .step-description {
    margin-bottom: 0;
}

/* Loading State */
.btn-submit.loading {
    opacity: 0.7;
    cursor: not-allowed;
}

.btn-submit.loading::after {
    content: '...';
}

/* Responsive */
@media (max-width: 640px) {
    body {
        padding: 16px;
        align-items: flex-start;
        padding-top: 40px;
    }

    .step-content {
        padding: 32px 24px;
    }

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.5rem;
        margin-bottom: 24px;
    }

    .nav-buttons {
        flex-direction: column-reverse;
    }

    .btn-next,
    .btn-submit,
    .btn-back {
        width: 100%;
        max-width: none;
    }
}

/* Keyboard Focus */
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--green-accent);
    outline-offset: 2px;
}

/* Required asterisk */
.required {
    color: #ef4444;
    font-weight: 600;
}

/* Validation Styles */
.input-group input:invalid:not(:placeholder-shown),
.input-group textarea:invalid:not(:placeholder-shown) {
    border-color: #ef4444;
}

.input-group input:valid:not(:placeholder-shown),
.input-group textarea:valid:not(:placeholder-shown) {
    border-color: var(--green-light);
}

/* Error message styles */
.error-message {
    background: #fef2f2;
    border: 1px solid #fecaca;
    color: #dc2626;
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 0.95rem;
    display: none;
    animation: shake 0.4s ease;
}

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

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20%, 60% { transform: translateX(-5px); }
    40%, 80% { transform: translateX(5px); }
}

.input-group.has-error input,
.input-group.has-error textarea {
    border-color: #ef4444;
    background: #fef2f2;
}

.input-group.has-error label {
    color: #dc2626;
}

.consent-group.has-error .checkbox-label {
    color: #dc2626;
}

.consent-group.has-error input[type="checkbox"] {
    border-color: #ef4444;
}