/* CSS Variables */
:root {
    --primary-color: #4F46E5;
    --primary-hover: #4338CA;
    --secondary-color: #6B7280;
    --success-color: #10B981;
    --warning-color: #F59E0B;
    --error-color: #EF4444;
    --background: #F9FAFB;
    --surface: #FFFFFF;
    --text-primary: #111827;
    --text-secondary: #6B7280;
    --border-color: #E5E7EB;
    --border-focus: #4F46E5;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --transition: all 0.2s ease;
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* Container */
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

/* Header */
.form-header {
    text-align: center;
    margin-bottom: 2rem;
}

.resume-banner {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1rem;
    border-radius: var(--radius-md);
    margin-top: 1rem;
    box-shadow: var(--shadow-md);
}

.resume-banner p {
    margin: 0;
    font-size: 0.95rem;
}

.btn-link {
    background: none;
    border: none;
    color: white;
    text-decoration: underline;
    cursor: pointer;
    font-weight: 600;
    padding: 0.25rem 0.5rem;
    font-size: 0.95rem;
}

.btn-link:hover {
    opacity: 0.8;
}

.form-header h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.form-header .subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* Progress Bar */
.progress-container {
    margin-bottom: 2rem;
}

.progress-bar {
    height: 8px;
    background: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 1rem;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), #818CF8);
    border-radius: 4px;
    transition: width 0.3s ease;
    width: 10%;
}

.progress-steps {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.progress-step {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.progress-step:hover {
    background: var(--border-color);
}

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

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

.progress-step .step-number {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    font-weight: 600;
}

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

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

/* Form Sections */
.form-section {
    background: var(--surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: 1.5rem;
    overflow: hidden;
    display: none;
}

.form-section.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

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

.section-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem;
    background: linear-gradient(135deg, var(--primary-color), #818CF8);
    color: white;
}

.section-number {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.1rem;
}

.section-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
}

.section-content {
    padding: 1.5rem;
}

/* Form Groups */
.form-group {
    margin-bottom: 1.5rem;
}

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

.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

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

/* Form Row */
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

@media (max-width: 600px) {
    .form-row {
        grid-template-columns: 1fr;
    }
}

/* Inputs */
input[type="text"],
input[type="url"],
input[type="email"],
input[type="number"],
input[type="month"],
input[type="date"],
select,
textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-family: inherit;
    transition: var(--transition);
    background: var(--surface);
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

input::placeholder,
textarea::placeholder {
    color: var(--text-secondary);
    opacity: 0.7;
}

textarea {
    resize: vertical;
    min-height: 80px;
}

select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%236B7280'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    background-size: 1.25rem;
    padding-right: 2.5rem;
}

/* Checkbox & Radio Groups */
.checkbox-group,
.radio-group {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.checkbox-label,
.radio-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--background);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 400;
}

.checkbox-label:hover,
.radio-label:hover {
    border-color: var(--primary-color);
    background: rgba(79, 70, 229, 0.05);
}

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

.checkbox-label:has(input:checked),
.radio-label:has(input:checked) {
    border-color: var(--primary-color);
    background: rgba(79, 70, 229, 0.1);
}

/* Market Size Grid */
.market-size-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

@media (max-width: 600px) {
    .market-size-grid {
        grid-template-columns: 1fr;
    }
}

.market-size-grid .form-group {
    margin-bottom: 0;
}

/* Founder Entry */
.founder-entry {
    background: var(--background);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1rem;
    margin-bottom: 1rem;
    position: relative;
}

.founder-entry-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.founder-entry-header h4 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--primary-color);
}

.remove-founder {
    background: none;
    border: none;
    color: var(--error-color);
    cursor: pointer;
    font-size: 0.85rem;
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.remove-founder:hover {
    background: rgba(239, 68, 68, 0.1);
}

.founder-fields {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
}

@media (max-width: 600px) {
    .founder-fields {
        grid-template-columns: 1fr;
    }
}

.founder-fields .form-group {
    margin-bottom: 0;
}

.founder-fields label {
    font-size: 0.85rem;
    margin-bottom: 0.25rem;
}

.founder-fields input,
.founder-fields select {
    padding: 0.5rem 0.75rem;
    font-size: 0.9rem;
}

/* Buttons */
.btn-primary,
.btn-secondary,
.btn-success {
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

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

.btn-primary:hover:not(:disabled) {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--surface);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--background);
    border-color: var(--text-secondary);
}

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

.btn-success:hover:not(:disabled) {
    background: #059669;
    transform: translateY(-1px);
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Form Navigation */
.form-navigation {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    padding: 1rem 0;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 2rem;
    max-width: 450px;
    width: 100%;
    text-align: center;
    animation: modalIn 0.3s ease;
}

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

.modal-icon {
    width: 64px;
    height: 64px;
    background: var(--success-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin: 0 auto 1rem;
}

.modal-content h2 {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.modal-content p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.modal-content button {
    margin: 0.25rem;
}

/* Validation States */
input.error,
select.error,
textarea.error {
    border-color: var(--error-color);
}

.error-message {
    color: var(--error-color);
    font-size: 0.85rem;
    margin-top: 0.25rem;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

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

    .section-header {
        padding: 1rem;
    }

    .section-content {
        padding: 1rem;
    }

    .progress-steps {
        display: none;
    }
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--background);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* Loading State */
.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3rem;
    gap: 1rem;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

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

/* Print Styles */
@media print {
    .form-navigation,
    .progress-container,
    .loading {
        display: none;
    }

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