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

:root {
    --primary-color: #265563;
    --primary-light: #2d6b7d;
    --secondary-color: #13AC8E;
    --success-color: #13AC8E;
    --danger-color: #f44336;
    --warning-color: #ff9800;
    --background: #f8f9fa;
    --surface: #ffffff;
    --border: #e0e0e0;
    --text-primary: #333333;
    --text-secondary: #666666;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.15);
    --transition: all 0.3s ease;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #f8f9fa 0%, #e8eef5 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    padding: 20px;
}

/* Form Container */
.form-container {
    max-width: 900px;
    margin: 0 auto;
    background: var(--surface);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

/* Header */
.form-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    color: white;
    padding: 40px 30px;
    text-align: center;
}

.form-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    letter-spacing: -0.5px;
}

.form-header p {
    font-size: 1.1rem;
    font-weight: 500;
    opacity: 0.95;
}

.form-header .subtitle {
    font-size: 0.95rem;
    opacity: 0.8;
    margin-top: 8px;
}

/* Progress Indicator */
.progress-container {
    padding: 30px;
    background: var(--background);
    border-bottom: 1px solid var(--border);
}

.progress-bar {
    height: 6px;
    background: var(--border);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 10px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--secondary-color) 0%, var(--primary-light) 100%);
    border-radius: 3px;
    width: 14%;
    transition: var(--transition);
}

.progress-text {
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Form */
.modern-form {
    padding: 30px;
}

/* Form Section */
.form-section {
    display: none;
    animation: slideIn 0.3s ease;
}

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

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

.section-header {
    margin-bottom: 30px;
    border-bottom: 2px solid var(--secondary-color);
    padding-bottom: 15px;
}

.section-header h2 {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.section-header p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Form Group */
.form-group {
    margin-bottom: 25px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.form-group label.required::after {
    content: ' *';
    color: var(--danger-color);
}

/* Input Fields */
input[type="text"],
input[type="email"],
input[type="tel"],
input[type="url"],
input[type="date"],
input[type="time"],
input[type="number"],
textarea,
select {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.95rem;
    font-family: inherit;
    transition: var(--transition);
    background: var(--surface);
    color: var(--text-primary);
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="tel"]:focus,
input[type="url"]:focus,
input[type="date"]:focus,
input[type="time"]:focus,
input[type="number"]:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--primary-light);
    box-shadow: 0 0 0 3px rgba(21, 101, 161, 0.1);
}

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

/* Checkbox and Radio */
.checkbox-grid,
.radio-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-top: 12px;
}

.checkbox-grid-large {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-top: 12px;
}

@media (max-width: 768px) {
    .checkbox-grid-large {
        grid-template-columns: 1fr;
    }
}

.checkbox-label,
.radio-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    padding: 10px;
    border-radius: 6px;
    transition: var(--transition);
}

.checkbox-label:hover,
.radio-label:hover {
    background: var(--background);
}

.checkbox-label input,
.radio-label input {
    margin-right: 10px;
    cursor: pointer;
    width: 18px;
    height: 18px;
    accent-color: var(--primary-light);
}

.checkbox-label span,
.radio-label span {
    user-select: none;
    color: var(--text-primary);
}

/* Participant Breakdown */
.participant-breakdown {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-top: 15px;
    padding: 20px;
    background: var(--background);
    border-radius: 8px;
}

.breakdown-row {
    display: flex;
    flex-direction: column;
}

.breakdown-row label {
    margin-bottom: 6px;
    font-weight: 500;
    font-size: 0.9rem;
}

.breakdown-row input {
    padding: 10px;
}

/* Input Group */
.input-group {
    display: flex;
    align-items: center;
}

.currency {
    background: var(--background);
    padding: 12px 14px;
    border: 1px solid var(--border);
    border-right: none;
    border-radius: 6px 0 0 6px;
    font-weight: 600;
    color: var(--text-secondary);
}

.input-group input {
    border-radius: 0 6px 6px 0;
    border-left: none;
}

/* Collapsible Section */
.collapsible-section {
    padding: 15px;
    background: var(--background);
    border-radius: 6px;
    border-left: 4px solid var(--secondary-color);
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from {
        opacity: 0;
        max-height: 0;
    }
    to {
        opacity: 1;
        max-height: 500px;
    }
}

.collapsible-section .form-group {
    margin-bottom: 15px;
}

.collapsible-section .form-group:last-child {
    margin-bottom: 0;
}

/* Buttons */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 6px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary-color) 100%);
    color: white;
}

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

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

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

.btn-secondary:hover {
    background: #d0d0d0;
}

.btn-success {
    background: linear-gradient(135deg, var(--success-color) 0%, #388e3c 100%);
    color: white;
}

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

.btn-large {
    padding: 16px 40px;
    font-size: 1.1rem;
    width: 100%;
}

/* Form Navigation */
.form-navigation {
    display: flex;
    gap: 15px;
    justify-content: space-between;
    margin-top: 40px;
    padding-top: 30px;
    border-top: 1px solid var(--border);
}

.form-actions {
    display: flex;
    gap: 15px;
    margin-top: 40px;
    padding-top: 30px;
    border-top: 1px solid var(--border);
}

.form-actions button {
    flex: 1;
}

/* Success Message */
.success-message {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.success-content {
    background: white;
    padding: 40px;
    border-radius: 12px;
    text-align: center;
    max-width: 500px;
    box-shadow: var(--shadow-lg);
    animation: scaleIn 0.3s ease;
}

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

.success-content h2 {
    color: var(--success-color);
    margin-bottom: 15px;
    font-size: 1.8rem;
}

.success-content p {
    color: var(--text-secondary);
    margin-bottom: 10px;
    line-height: 1.6;
}

.success-content button {
    margin-top: 20px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .form-container {
        border-radius: 0;
    }

    .form-header {
        padding: 30px 20px;
    }

    .form-header h1 {
        font-size: 1.8rem;
    }

    .form-header p {
        font-size: 1rem;
    }

    .modern-form,
    .progress-container {
        padding: 20px;
    }

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

    .section-header h2 {
        font-size: 1.5rem;
    }

    .checkbox-grid,
    .radio-group,
    .participant-breakdown {
        grid-template-columns: 1fr;
    }

    .form-navigation {
        flex-direction: column;
    }

    .form-navigation button {
        width: 100%;
    }

    .form-actions {
        flex-direction: column;
    }

    .form-actions button {
        width: 100%;
    }
}

@media (max-width: 480px) {
    body {
        padding: 10px;
    }

    .form-header {
        padding: 20px 15px;
    }

    .form-header h1 {
        font-size: 1.5rem;
    }

    .modern-form,
    .progress-container {
        padding: 15px;
    }

    .section-header {
        margin-bottom: 20px;
    }

    .section-header h2 {
        font-size: 1.3rem;
    }

    .form-group {
        margin-bottom: 18px;
    }

    input[type="text"],
    input[type="email"],
    input[type="tel"],
    input[type="url"],
    input[type="date"],
    input[type="time"],
    input[type="number"],
    textarea {
        padding: 10px 12px;
        font-size: 16px;
    }

    .btn {
        padding: 11px 18px;
        font-size: 0.85rem;
    }
}

/* Validation Styles */
input:invalid:not(:placeholder-shown),
textarea:invalid:not(:placeholder-shown) {
    border-color: var(--danger-color);
}

input:invalid:not(:placeholder-shown):focus {
    box-shadow: 0 0 0 3px rgba(244, 67, 54, 0.1);
}

input:valid:not(:placeholder-shown),
textarea:valid:not(:placeholder-shown) {
    border-color: var(--success-color);
}

/* Print Styles */
@media print {
    body {
        background: white;
    }

    .form-container {
        box-shadow: none;
    }

    .form-navigation,
    .form-actions,
    .progress-container {
        display: none;
    }

    .form-section {
        display: block !important;
        page-break-inside: avoid;
        margin-bottom: 20px;
    }
}