/* ===== CSS Variables & Reset ===== */
:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #64748b;
    --success: #10b981;
    --success-dark: #059669;
    --error: #ef4444;
    --error-light: #fecaca;
    --warning: #f59e0b;
    --background: #f8fafc;
    --surface: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border: #e2e8f0;
    --border-focus: #6366f1;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: var(--text-primary);
    line-height: 1.6;
    padding: 2rem 1rem;
}

/* ===== Container ===== */
.container {
    max-width: 900px;
    margin: 0 auto;
}

/* ===== Header ===== */
.header {
    text-align: center;
    color: white;
    margin-bottom: 2.5rem;
    animation: fadeInDown 0.6s ease-out;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.logo svg {
    color: white;
}

.logo h1 {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
    font-weight: 300;
}

/* ===== Progress Bar ===== */
.progress-container {
    background: var(--surface);
    padding: 1.5rem;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    margin-bottom: 1.5rem;
    animation: fadeInUp 0.6s ease-out 0.2s both;
}

.progress-bar {
    height: 0.5rem;
    background: var(--border);
    border-radius: 9999px;
    overflow: hidden;
    margin-bottom: 1.5rem;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--primary-light));
    border-radius: 9999px;
    transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    width: 0%;
}

.progress-steps {
    display: flex;
    justify-content: space-between;
}

.step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    flex: 1;
    position: relative;
}

.step-circle {
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 50%;
    background: var(--border);
    color: var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
    transition: var(--transition);
}

.step.active .step-circle {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.2);
}

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

.step span {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-weight: 500;
    text-align: center;
}

.step.active span {
    color: var(--primary);
    font-weight: 600;
}

.step.completed span {
    color: var(--success);
}

/* ===== Form Container ===== */
.form-container {
    background: var(--surface);
    border-radius: var(--radius-xl);
    padding: 2.5rem;
    box-shadow: var(--shadow-xl);
    animation: fadeInUp 0.6s ease-out 0.4s both;
}

.form-step {
    display: none;
    animation: fadeIn 0.4s ease-out;
}

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

.section-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.section-title svg {
    color: var(--primary);
}

/* ===== Form Grid ===== */
.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    position: relative;
}

.form-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
}

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

.form-group input,
.form-group select {
    padding: 0.75rem 1rem;
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: inherit;
    background: var(--surface);
    color: var(--text-primary);
    transition: var(--transition);
    outline: none;
}

.form-group input:focus,
.form-group select:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-group input.error,
.form-group select.error {
    border-color: var(--error);
    background: var(--error-light);
}

.form-group input.success,
.form-group select.success {
    border-color: var(--success);
}

.error-message {
    font-size: 0.875rem;
    color: var(--error);
    min-height: 1.25rem;
    display: block;
}

.success-icon {
    position: absolute;
    right: 1rem;
    top: 2.5rem;
    color: var(--success);
    font-weight: 600;
    display: none;
}

.form-group input.success + .success-icon,
.form-group select.success + .success-icon {
    display: block;
}

.hint {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

/* ===== Buttons ===== */
.button-group {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
}

.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--surface);
    color: var(--text-primary);
    border: 2px solid var(--border);
}

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

.btn-success {
    background: linear-gradient(135deg, var(--success), var(--success-dark));
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* ===== Review Section ===== */
.review-section {
    display: grid;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.review-card {
    background: var(--background);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
}

.review-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.review-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.review-item {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.review-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
}

.review-value {
    font-size: 0.95rem;
    color: var(--text-primary);
    font-weight: 500;
    word-break: break-word;
}

/* ===== Checkbox ===== */
.checkbox-container {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    cursor: pointer;
    position: relative;
}

.checkbox-container input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

.checkmark {
    width: 1.25rem;
    height: 1.25rem;
    background: var(--surface);
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    position: relative;
    flex-shrink: 0;
    margin-top: 0.125rem;
    transition: var(--transition);
}

.checkbox-container:hover input ~ .checkmark {
    border-color: var(--primary);
}

.checkbox-container input:checked ~ .checkmark {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border-color: var(--primary);
}

.checkmark:after {
    content: "";
    position: absolute;
    display: none;
    left: 0.35rem;
    top: 0.1rem;
    width: 0.25rem;
    height: 0.6rem;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.checkbox-container input:checked ~ .checkmark:after {
    display: block;
}

.terms-text {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.link {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

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

.terms-section {
    margin-bottom: 1.5rem;
}

/* ===== Second Vehicle ===== */
.vehicle-divider {
    border: none;
    border-top: 1px dashed var(--border);
    margin: 2rem 0 1.5rem;
}

.add-vehicle-btn {
    display: flex;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.second-vehicle {
    background: var(--background);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    animation: fadeIn 0.3s ease-out;
}

.sub-section-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.optional-tag {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-muted);
    background: var(--border);
    padding: 0.125rem 0.5rem;
    border-radius: 9999px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.form-error {
    text-align: center;
    margin-bottom: 1rem;
}

.address-title {
    margin-top: 1.5rem;
}

/* ===== Modal ===== */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease-out;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--surface);
    padding: 3rem;
    border-radius: var(--radius-xl);
    text-align: center;
    max-width: 500px;
    width: 90%;
    box-shadow: var(--shadow-xl);
    animation: scaleIn 0.3s ease-out;
}

.modal-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--success), var(--success-dark));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: white;
}

.modal-content h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.modal-content p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.reference-number {
    background: var(--background);
    padding: 1rem;
    border-radius: var(--radius-md);
    margin: 1.5rem 0;
    font-family: 'Courier New', monospace;
}

.modal-download-btn {
    margin-top: 0.75rem;
}

/* ===== Footer ===== */
.footer {
    text-align: center;
    color: white;
    margin-top: 2rem;
    opacity: 0.8;
    font-size: 0.875rem;
}

/* ===== Animations ===== */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

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

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
    20%, 40%, 60%, 80% { transform: translateX(5px); }
}

.shake {
    animation: shake 0.5s ease-in-out;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    body {
        padding: 1rem 0.5rem;
    }

    .logo h1 {
        font-size: 2rem;
    }

    .form-container {
        padding: 1.5rem;
    }

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

    .progress-steps {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }

    .step {
        flex-direction: row;
        align-items: center;
    }

    .button-group {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .review-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .logo h1 {
        font-size: 1.75rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    .form-container {
        padding: 1rem;
    }

    .section-title {
        font-size: 1.25rem;
    }
}

/* ===== Spinner ===== */
.spinner {
    width: 1rem;
    height: 1rem;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    display: inline-block;
}

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