/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --twitter-blue: #1DA1F2;
    --twitter-blue-dark: #1991DB;
    --twitter-blue-light: #E1F5FE;
    --white: #FFFFFF;
    --gray-50: #FAFAFA;
    --gray-100: #F5F5F5;
    --gray-200: #EEEEEE;
    --gray-300: #E0E0E0;
    --gray-400: #BDBDBD;
    --gray-500: #9E9E9E;
    --gray-600: #757575;
    --gray-700: #616161;
    --gray-800: #424242;
    --gray-900: #212121;
    --success: #4CAF50;
    --warning: #FF9800;
    --error: #F44336;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--gray-800);
    background-color: var(--white);
    min-height: 100vh;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.header {
    text-align: center;
    padding: 40px 0;
    border-bottom: 2px solid var(--gray-100);
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 8px;
}

.logo-icon {
    width: 40px;
    height: 40px;
}

.logo h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--twitter-blue);
    margin: 0;
}

.tagline {
    font-size: 1.1rem;
    color: var(--gray-600);
    margin: 0;
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 40px 0;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: start;
}

/* Info Section */
.info-section {
    padding-right: 20px;
}

.info-card {
    background: var(--gray-50);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 32px;
    height: fit-content;
    position: sticky;
    top: 20px;
}

.info-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.info-icon {
    width: 24px;
    height: 24px;
    color: var(--twitter-blue);
}

.info-card h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--gray-800);
    margin: 0;
}

.info-card p {
    color: var(--gray-600);
    margin-bottom: 24px;
    font-size: 1rem;
}

.features {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.feature {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    background: var(--white);
    border-radius: var(--radius-md);
    border: 1px solid var(--gray-200);
}

.feature-icon {
    width: 18px;
    height: 18px;
    color: var(--twitter-blue);
    flex-shrink: 0;
}

.feature span {
    font-size: 0.9rem;
    color: var(--gray-700);
}

/* Form Section */
.form-section {
    padding-left: 20px;
}

.form-card {
    background: var(--white);
    border: 2px solid var(--twitter-blue);
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow-lg);
}

.form-card h2 {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 24px;
    text-align: center;
}

/* Form Styles */
.key-form {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
    color: var(--gray-700);
    font-size: 0.95rem;
}

.label-icon {
    width: 16px;
    height: 16px;
    color: var(--twitter-blue);
}

.form-input,
.form-select {
    padding: 12px 16px;
    border: 2px solid var(--gray-300);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: all 0.2s ease;
    background: var(--white);
}

.form-input:focus,
.form-select:focus {
    outline: none;
    border-color: var(--twitter-blue);
    box-shadow: 0 0 0 3px var(--twitter-blue-light);
}

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

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

/* Checkbox Styles */
.checkbox-group {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    background: var(--gray-50);
    border-radius: var(--radius-md);
    border: 2px solid var(--gray-200);
    transition: all 0.2s ease;
}

.checkbox-group:hover {
    border-color: var(--twitter-blue);
    background: var(--twitter-blue-light);
}

.form-checkbox {
    width: 18px;
    height: 18px;
    accent-color: var(--twitter-blue);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
    color: var(--gray-700);
    cursor: pointer;
    margin: 0;
}

/* Help Text and Errors */
.field-help {
    font-size: 0.85rem;
    color: var(--gray-500);
    margin-top: 4px;
}

.field-error {
    font-size: 0.85rem;
    color: var(--error);
    margin-top: 4px;
    display: none;
}

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

/* Tooltips */
.tooltip-trigger {
    position: relative;
    cursor: help;
}

.help-icon {
    width: 14px;
    height: 14px;
    color: var(--gray-400);
}

.tooltip {
    position: absolute;
    background: var(--gray-900);
    color: var(--white);
    padding: 8px 12px;
    border-radius: var(--radius-md);
    font-size: 0.8rem;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
    max-width: 200px;
    line-height: 1.4;
}

.tooltip.show {
    opacity: 1;
}

/* Buttons */
.btn-generate {
    background: var(--twitter-blue);
    color: var(--white);
    border: none;
    padding: 16px 32px;
    border-radius: var(--radius-lg);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-top: 16px;
    position: relative;
    overflow: hidden;
}

.btn-generate:hover:not(:disabled) {
    background: var(--twitter-blue-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-generate:disabled {
    background: var(--gray-400);
    cursor: not-allowed;
    transform: none;
}

.btn-icon {
    width: 20px;
    height: 20px;
}

.btn-text {
    transition: opacity 0.2s ease;
}

.btn-spinner {
    display: none;
    width: 20px;
    height: 20px;
    border: 2px solid transparent;
    border-top: 2px solid var(--white);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.btn-generate.loading .btn-text,
.btn-generate.loading .btn-icon {
    opacity: 0;
}

.btn-generate.loading .btn-spinner {
    display: block;
}

.btn-secondary {
    background: var(--white);
    color: var(--twitter-blue);
    border: 2px solid var(--twitter-blue);
    padding: 12px 24px;
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-secondary:hover {
    background: var(--twitter-blue);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Results Section */
.results-section,
.error-section {
    grid-column: 1 / -1;
    margin-top: 40px;
}

.results-card,
.error-card {
    background: var(--white);
    border: 2px solid var(--success);
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow-lg);
    text-align: center;
}

.error-card {
    border-color: var(--error);
}

.results-card h2,
.error-card h2 {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 16px;
}

.success-message {
    color: var(--success);
    font-size: 1.1rem;
    margin-bottom: 32px;
}

.error-header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 16px;
}

.error-icon {
    width: 24px;
    height: 24px;
    color: var(--error);
}

.error-message {
    color: var(--error);
    font-size: 1.1rem;
    margin-bottom: 24px;
}

/* Download Grid */
.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 32px;
}

.download-item {
    background: var(--gray-50);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 20px;
    transition: all 0.2s ease;
}

.download-item:hover {
    border-color: var(--twitter-blue);
    background: var(--twitter-blue-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.download-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.download-icon {
    width: 20px;
    height: 20px;
    color: var(--twitter-blue);
}

.download-title {
    font-weight: 600;
    color: var(--gray-800);
    margin: 0;
}

.download-info {
    font-size: 0.9rem;
    color: var(--gray-600);
    margin-bottom: 16px;
}

.download-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--twitter-blue);
    color: var(--white);
    text-decoration: none;
    padding: 10px 20px;
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: all 0.2s ease;
}

.download-link:hover {
    background: var(--twitter-blue-dark);
    transform: translateY(-1px);
}

.download-link-icon {
    width: 16px;
    height: 16px;
}

/* Security Notice */
.security-notice {
    background: var(--warning);
    color: var(--white);
    padding: 20px;
    border-radius: var(--radius-lg);
    margin-bottom: 24px;
    display: flex;
    align-items: flex-start;
    gap: 16px;
    text-align: left;
}

.notice-icon {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
    margin-top: 2px;
}

.notice-content strong {
    display: block;
    margin-bottom: 8px;
    font-size: 1.1rem;
}

.notice-content p {
    margin: 0;
    opacity: 0.9;
}

/* Footer */
.footer {
    border-top: 2px solid var(--gray-100);
    padding: 32px 0;
    text-align: center;
    margin-top: auto;
}

.footer p {
    color: var(--gray-600);
    margin-bottom: 16px;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 24px;
}

.footer-link {
    color: var(--twitter-blue);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
}

.footer-link:hover {
    color: var(--twitter-blue-dark);
}

/* Responsive Design */
@media (max-width: 968px) {
    .main-content {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    
    .info-section,
    .form-section {
        padding: 0;
    }
    
    .info-card {
        position: static;
    }
}

@media (max-width: 640px) {
    .container {
        padding: 0 16px;
    }
    
    .header {
        padding: 24px 0;
    }
    
    .logo h1 {
        font-size: 2rem;
    }
    
    .main-content {
        padding: 24px 0;
        gap: 24px;
    }
    
    .info-card,
    .form-card {
        padding: 24px;
    }
    
    .download-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        flex-direction: column;
        gap: 12px;
    }
}

/* Animation for showing/hiding sections */
.fade-in {
    animation: fadeIn 0.5s ease-in-out;
}

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

/* Accessibility improvements */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* High contrast mode */
@media (prefers-contrast: high) {
    :root {
        --gray-300: #000000;
        --gray-600: #000000;
        --twitter-blue: #0000FF;
        --twitter-blue-dark: #0000CC;
    }
}

/* Focus styles for accessibility */
*:focus {
    outline: 2px solid var(--twitter-blue);
    outline-offset: 2px;
}

button:focus,
input:focus,
select:focus {
    outline: none;
    box-shadow: 0 0 0 3px var(--twitter-blue-light);
}

/* General Modal Styling */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.6);
    align-items: center;
    justify-content: center;
}

.modal.modal-open {
    display: flex !important;
}

.modal-content {
  background-color: #fefefe; /* var(--white) might be better for consistency */
  margin: auto; /* Handles centering for block display, works with flex too */
  padding: 20px;
  border: 1px solid #888; /* var(--gray-300) might be better */
  width: 80%;
  max-width: 600px; /* Max width for larger screens */
  border-radius: 8px; /* var(--radius-md) or var(--radius-lg) */
  box-shadow: 0 4px 8px 0 rgba(0,0,0,0.2),0 6px 20px 0 rgba(0,0,0,0.19); /* Consider var(--shadow-lg) or var(--shadow-xl) */
  position: relative; /* For positioning the close button */
}

/* Close Button Styling (for new modals) */
.close-button {
  color: #aaa; /* var(--gray-500) */
  float: right; /* Avoid float if using flex for header */
  font-size: 28px;
  font-weight: bold;
  position: absolute; /* Position relative to modal-content */
  top: 10px;
  right: 20px;
}

.close-button:hover,
.close-button:focus {
  color: black; /* var(--gray-900) */
  text-decoration: none;
  cursor: pointer;
}

/* Modal Header Styling (general for h2 in new modals) */
.modal-content h2 {
  margin-top: 0;
  font-size: 1.5em; /* Example size, adjust as needed */
}

.modal-icon {
  margin-right: 10px; /* Space between icon and title */
}

/* Modal Paragraph and List Styling (for new modals) */
.modal-content p,
.modal-content ul {
  line-height: 1.6;
  margin-bottom: 15px;
}

.modal-content ul {
  padding-left: 20px;
}

.modal-content li {
  margin-bottom: 8px;
}

/* Specific About Modal Styles (ensure these are preserved or adapted) */
/* The existing .modal and .modal-content are now generalized. */
/* .modal-header, .modal-close, .modal-body, .about-section specific styles below */
/* should continue to work for the About modal. */

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--gray-200);
    margin-bottom: 24px;
}

.modal-header h2 {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--gray-800);
    margin: 0;
}

.modal-close {
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 4px;
    border-radius: var(--radius-sm);
    transition: background-color 0.2s ease;
}

.modal-close:hover {
    background-color: var(--gray-100);
}

.modal-close i {
    width: 24px;
    height: 24px;
    color: var(--gray-600);
    display: block; /* Ensures proper alignment */
}

.modal-body {
    font-size: 1rem;
    color: var(--gray-700);
}

.about-section {
    margin-bottom: 20px;
    padding-bottom: 20px;
    border-bottom: 1px dashed var(--gray-200);
}

.about-section:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.about-section h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--twitter-blue);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.about-icon {
    width: 18px;
    height: 18px;
    color: var(--twitter-blue);
}

.about-section p {
    margin-bottom: 8px;
    line-height: 1.6;
}

.about-section a {
    color: var(--twitter-blue);
    text-decoration: none;
    font-weight: 500;
}

.about-section a:hover {
    text-decoration: underline;
    color: var(--twitter-blue-dark);
}

/* Responsive adjustments for modal */
@media (max-width: 768px) {
    .modal-content {
        width: 95%;
        padding: 24px;
    }
    .modal-header h2 {
        font-size: 1.5rem;
    }
    .modal-body {
        font-size: 0.95rem;
    }
}

@media (max-width: 480px) {
    .modal-header {
        padding-bottom: 12px;
        margin-bottom: 16px;
    }
    .modal-header h2 {
        font-size: 1.3rem;
    }
    .about-section h3 {
        font-size: 1rem;
    }
    .about-icon {
        width: 16px;
        height: 16px;
    }
}

/* Responsive adjustments for general modals */
@media screen and (max-width: 768px) {
  .modal-content { /* This will also affect About Modal if it uses .modal-content */
    width: 90%;
    padding: 15px;
  }
  .modal-content h2 { /* This could affect About Modal's h2 if not overridden by .modal-header h2 */
    font-size: 1.3em;
  }
  .close-button { /* Specific to new modals' close buttons */
    font-size: 24px;
    top: 5px;
    right: 15px;
  }
}