:root {
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --success-color: #10b981;
    --success-hover: #059669;
    --bg-color: #f3f4f6;
    --card-bg: #ffffff;
    --text-main: #1f2937;
    --text-muted: #6b7280;
    --border-color: #e5e7eb;
    --error-color: #ef4444;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    display: flex;
    justify-content: center;
    padding: 20px;
    min-height: 100vh;
}

.container {
    background-color: var(--card-bg);
    max-width: 800px;
    width: 100%;
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    padding: 30px;
}

header {
    text-align: center;
    margin-bottom: 30px;
}

header h1 {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 8px;
}

header p {
    color: var(--text-muted);
    font-size: 14px;
}

/* Progress bar */
.progress-bar {
    display: flex;
    justify-content: space-between;
    margin-bottom: 30px;
    position: relative;
}

.progress-bar::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
    height: 3px;
    width: 100%;
    background-color: var(--border-color);
    z-index: 1;
}

.step {
    width: 35px;
    height: 35px;
    border-radius: 50%;
    background-color: var(--card-bg);
    border: 3px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    color: var(--text-muted);
    z-index: 2;
    transition: all 0.3s ease;
}

.step.active {
    border-color: var(--primary-color);
    background-color: var(--primary-color);
    color: white;
}

.step.completed {
    border-color: var(--success-color);
    background-color: var(--success-color);
    color: white;
}

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

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

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

h2 {
    font-size: 18px;
    margin-bottom: 20px;
    color: var(--text-main);
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 10px;
}

/* Form Groups */
.form-group {
    margin-bottom: 20px;
}

.form-group-row {
    display: flex;
    gap: 15px;
}

.form-group.half {
    flex: 1;
}

label {
    display: block;
    font-weight: 500;
    margin-bottom: 6px;
    font-size: 14px;
    color: var(--text-main);
}

.required {
    color: var(--error-color);
}

input[type="text"],
input[type="date"],
input[type="number"],
input[type="tel"],
select,
textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 15px;
    font-family: inherit;
    color: var(--text-main);
    transition: border-color 0.2s;
    background-color: #fafafa;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    background-color: #ffffff;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

textarea {
    resize: vertical;
}

.radio-group {
    display: flex;
    gap: 20px;
}

.radio-label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-weight: 400;
}

input[type="radio"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.hidden {
    display: none;
}

/* Buttons */
.buttons {
    display: flex;
    justify-content: space-between;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.btn {
    padding: 10px 24px;
    border: none;
    border-radius: 6px;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    margin-left: auto;
}

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

.btn-secondary {
    background-color: #e5e7eb;
    color: var(--text-main);
}

.btn-secondary:hover {
    background-color: #d1d5db;
}

.btn-success {
    background-color: var(--success-color);
    color: white;
    margin-left: auto;
}

.btn-success:hover {
    background-color: var(--success-hover);
}

/* Invalid fields */
input.invalid, select.invalid, textarea.invalid {
    border-color: var(--error-color);
    background-color: #fef2f2;
}

/* Loading */
.loading {
    text-align: center;
    margin-top: 20px;
}

.spinner {
    border: 4px solid rgba(0, 0, 0, 0.1);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border-left-color: var(--primary-color);
    animation: spin 1s linear infinite;
    margin: 0 auto 10px auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.submit-message {
    margin-top: 15px;
    padding: 12px;
    border-radius: 6px;
    text-align: center;
    font-weight: 500;
}

.submit-message.success {
    background-color: #d1fae5;
    color: #065f46;
    border: 1px solid #34d399;
}

.submit-message.error {
    background-color: #fee2e2;
    color: #991b1b;
    border: 1px solid #f87171;
}

/* Responsive */
@media (max-width: 600px) {
    .container {
        padding: 20px;
    }

    .form-group-row {
        flex-direction: column;
        gap: 0;
    }
    
    header h1 {
        font-size: 20px;
    }
}