:root {
    --primary-font: "Times New Roman", Times, serif;
    --body-font: "Georgia", serif;
    --mono-font: "Courier New", Courier, monospace;
    
    --text-color: #000;
    --text-secondary: #333;
    --text-muted: #555;
    --text-light: #666;
    --text-faint: #999;
    
    --bg-color: #fff;
    --bg-secondary: #f5f5f5;
    --bg-tertiary: #f0f0f0;
    
    --accent: #0066cc;
    --accent-light: #e7f3ff;
    
    --border: #eee;
    --border-dark: #ddd;
    
    --success: #155724;
    --success-bg: #d4edda;
    --error: #721c24;
    --error-bg: #f8d7da;
    --info: #0066cc;
    --info-bg: #e7f3ff;
    
    --btn-bg: #000;
    --btn-hover: #333;
    --btn-text: #fff;
    
    --code-bg: #282c34;
    --code-text: #abb2bf;
    
    --new-article-bg: #f0fff0;
    --new-article-border: #28a745;
}

[data-theme="dark"] {
    --text-color: #f5f5f5;
    --text-secondary: #e0e0e0;
    --text-muted: #b0b0b0;
    --text-light: #999;
    --text-faint: #666;
    
    --bg-color: #121212;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #252525;
    
    --accent: #4da6ff;
    --accent-light: rgba(77, 166, 255, 0.15);
    
    --border: #333;
    --border-dark: #444;
    
    --btn-bg: #fff;
    --btn-hover: #e0e0e0;
    --btn-text: #000;
    
    --code-bg: #1e1e1e;
    --code-text: #d4d4d4;
    
    --new-article-bg: #1a2f1a;
    --new-article-border: #4caf50;
}

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

body {
    font-family: var(--body-font);
    color: var(--text-color);
    background-color: var(--bg-color);
    padding: 40px 20px;
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 800px;
    margin: 0 auto;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 60px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border);
}

.logo-link {
    display: flex;
    align-items: center;
    gap: 15px;
    text-decoration: none;
    color: inherit;
}

.airdisk-logo {
    height: 40px;
    width: auto;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 20px;
}

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-links a {
    font-family: var(--mono-font);
    font-size: 0.8rem;
    color: var(--text-light);
    text-decoration: none;
    transition: color 0.3s ease;
}

.nav-links a:hover {
    color: var(--text-color);
}

.nav-links a.active {
    color: var(--text-color);
    font-weight: bold;
}

.theme-toggle {
    background: none;
    border: 1px solid var(--border);
    border-radius: 50%;
    width: 36px;
    height: 36px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    color: var(--text-color);
}

.theme-toggle:hover {
    background: var(--bg-secondary);
    border-color: var(--text-light);
}

.theme-toggle svg {
    width: 18px;
    height: 18px;
}

.theme-toggle .sun-icon {
    display: none;
}

.theme-toggle .moon-icon {
    display: block;
}

[data-theme="dark"] .theme-toggle .sun-icon {
    display: block;
}

[data-theme="dark"] .theme-toggle .moon-icon {
    display: none;
}

/* Typography */
.page-title {
    font-family: var(--primary-font);
    font-size: 2.5rem;
    margin-bottom: 10px;
    color: var(--text-color);
}

.page-subtitle {
    font-family: var(--mono-font);
    font-size: 0.85rem;
    color: var(--text-light);
    margin-bottom: 50px;
}

.hero-title {
    font-family: var(--primary-font);
    font-size: 2.8rem;
    line-height: 1.2;
    margin-bottom: 20px;
    letter-spacing: -0.02em;
    color: var(--text-color);
}

.hero-subtitle {
    font-family: var(--mono-font);
    font-size: 0.9rem;
    color: var(--text-light);
}

.section-title {
    font-family: var(--primary-font);
    font-size: 1.6rem;
    margin-bottom: 25px;
    color: var(--text-color);
}

.paragraph {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.highlight {
    font-weight: 600;
}

/* Hero Section */
.hero-section {
    text-align: center;
    margin-bottom: 70px;
}

/* Info Grid */
.info-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-bottom: 50px;
    padding-bottom: 40px;
    border-bottom: 1px solid var(--border);
}

.info-item {
    text-align: center;
}

.info-label {
    font-family: var(--mono-font);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-faint);
    margin-bottom: 8px;
}

.info-content {
    font-family: var(--mono-font);
    font-size: 0.85rem;
    color: var(--text-color);
}

.info-content a {
    color: var(--accent);
    text-decoration: none;
    transition: opacity 0.3s ease;
}

.info-content a:hover {
    opacity: 0.7;
}

/* Team Section */
.team-section {
    margin-top: 50px;
    padding-top: 40px;
    border-top: 1px solid var(--border);
}

.team-section h3 {
    font-family: var(--primary-font);
    font-size: 1.4rem;
    margin-bottom: 25px;
    color: var(--text-color);
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px 40px;
}

.team-name {
    font-family: var(--mono-font);
    font-size: 0.85rem;
    color: var(--text-muted);
    padding: 8px 0;
    transition: color 0.3s ease;
}

.team-name:hover {
    color: var(--accent);
}

/* Vision Section */
.vision-section {
    background: var(--bg-secondary);
    padding: 35px;
    margin: 50px 0;
    border: 1px solid var(--border);
}

.vision-section .quote {
    font-family: var(--primary-font);
    font-size: 1.3rem;
    font-style: italic;
    margin-bottom: 15px;
    color: var(--text-color);
}

/* Intro Box */
.intro-box,
.submit-section,
.form-section {
    background: var(--bg-secondary);
    padding: 30px;
    margin-bottom: 50px;
    border: 1px solid var(--border);
}

.intro-box h2,
.submit-section h3,
.form-section h2 {
    font-family: var(--primary-font);
    font-size: 1.2rem;
    margin-bottom: 12px;
    color: var(--text-color);
}

.intro-box p,
.submit-section p {
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--text-muted);
}

/* Values Grid */
.values-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
    margin-bottom: 50px;
}

.value-card {
    background: var(--bg-secondary);
    padding: 24px;
    border: 1px solid var(--border);
}

.value-card h3 {
    font-family: var(--primary-font);
    font-size: 1rem;
    margin-bottom: 8px;
    color: var(--text-color);
}

.value-card p {
    font-size: 0.85rem;
    color: var(--text-light);
    line-height: 1.5;
}

/* Job Cards */
.job-card {
    padding: 32px 0;
    border-bottom: 1px solid var(--border);
}

.job-card:last-child {
    border-bottom: none;
}

.job-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 12px;
    flex-wrap: wrap;
    gap: 10px;
}

.job-title {
    font-family: var(--primary-font);
    font-size: 1.2rem;
    color: var(--text-color);
}

.job-location {
    font-family: var(--mono-font);
    font-size: 0.75rem;
    color: var(--text-light);
    background: var(--bg-tertiary);
    padding: 4px 10px;
}

.job-description {
    font-size: 0.95rem;
    color: var(--text-muted);
    line-height: 1.7;
    margin-bottom: 16px;
}

.job-requirements h4 {
    font-family: var(--mono-font);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-faint);
    margin-bottom: 10px;
}

.job-requirements ul {
    list-style: none;
    padding: 0;
    margin: 0 0 20px 0;
}

.job-requirements li {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 6px;
    padding-left: 18px;
    position: relative;
}

.job-requirements li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--accent);
}

/* Benefits */
.benefits-section {
    margin-top: 50px;
}

.benefits-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

.benefit-item {
    font-size: 0.9rem;
    color: var(--text-muted);
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
}

/* Contact Grid */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-bottom: 50px;
}

.contact-card {
    background: var(--bg-secondary);
    padding: 28px;
    border: 1px solid var(--border);
}

.contact-card h3 {
    font-family: var(--mono-font);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-faint);
    margin-bottom: 10px;
}

.contact-card h2 {
    font-family: var(--primary-font);
    font-size: 1.1rem;
    margin-bottom: 10px;
    color: var(--text-color);
}

.contact-card p {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.5;
    margin-bottom: 12px;
}

.contact-card a {
    font-family: var(--mono-font);
    font-size: 0.85rem;
    color: var(--accent);
    text-decoration: none;
    transition: opacity 0.3s ease;
}

.contact-card a:hover {
    opacity: 0.7;
}

/* Locations Grid */
.locations-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-bottom: 50px;
}

.location-card {
    background: var(--bg-secondary);
    padding: 24px;
    border: 1px solid var(--border);
}

.location-card h4 {
    font-family: var(--primary-font);
    font-size: 1rem;
    margin-bottom: 8px;
    color: var(--text-color);
}

.location-card p {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.5;
}

/* Form */
.contact-form {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-family: var(--mono-font);
    font-size: 0.75rem;
    color: var(--text-light);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 12px 14px;
    font-family: var(--body-font);
    font-size: 0.95rem;
    border: 1px solid var(--border-dark);
    background: var(--bg-color);
    color: var(--text-color);
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
}

.form-group textarea {
    min-height: 130px;
    resize: vertical;
}

.submit-btn,
.apply-btn {
    font-family: var(--mono-font);
    font-size: 0.85rem;
    padding: 12px 28px;
    background: var(--btn-bg);
    color: var(--btn-text);
    border: none;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    transition: background 0.3s ease;
    align-self: flex-start;
}

.submit-btn:hover,
.apply-btn:hover {
    background: var(--btn-hover);
}

.status-message {
    font-family: var(--mono-font);
    font-size: 0.8rem;
    padding: 10px;
    margin-top: 10px;
    display: none;
}

.status-message.success {
    color: var(--success);
    background: var(--success-bg);
    display: block;
}

.status-message.error {
    color: var(--error);
    background: var(--error-bg);
    display: block;
}

.status-message.loading {
    color: var(--info);
    background: var(--info-bg);
    display: block;
    padding: 15px 20px;
    border-radius: 4px;
}

.status-message .progress-container {
    margin-top: 12px;
    background: rgba(0, 102, 204, 0.1);
    border-radius: 4px;
    overflow: hidden;
    height: 6px;
}

.status-message .progress-bar {
    height: 100%;
    background: var(--accent);
    width: 0%;
    transition: width 0.3s ease;
    border-radius: 4px;
}

.status-message .progress-text {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 8px;
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Research Area */
.research-area {
    padding: 30px 0;
    border-bottom: 1px solid var(--border);
}

.research-area:last-child {
    border-bottom: none;
}

.research-area h3 {
    font-family: var(--primary-font);
    font-size: 1.3rem;
    margin-bottom: 12px;
    color: var(--text-color);
}

.research-area p {
    font-size: 0.95rem;
    color: var(--text-muted);
    line-height: 1.7;
    margin-bottom: 16px;
}

.topics {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.topic-tag,
.article-tag {
    font-family: var(--mono-font);
    font-size: 0.75rem;
    color: var(--accent);
    background: var(--accent-light);
    padding: 4px 10px;
}

/* CTA Box */
.cta-box {
    background: var(--bg-secondary);
    padding: 28px;
    margin-top: 50px;
    border: 1px solid var(--border);
}

.cta-box h3 {
    font-family: var(--primary-font);
    font-size: 1.2rem;
    margin-bottom: 12px;
    color: var(--text-color);
}

.cta-box p {
    font-family: var(--mono-font);
    font-size: 0.85rem;
    color: var(--text-light);
}

.cta-box a {
    color: var(--accent);
    text-decoration: none;
}

.cta-box a:hover {
    text-decoration: underline;
}

/* Articles */
.articles-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border);
}

.articles-header h2 {
    font-family: var(--primary-font);
    font-size: 1.5rem;
    color: var(--text-color);
}

.articles-count {
    font-family: var(--mono-font);
    font-size: 0.8rem;
    color: var(--text-light);
}

.article-card {
    padding: 30px 0;
    border-bottom: 1px solid var(--border);
    transition: background 0.3s ease;
}

.article-card:last-child {
    border-bottom: none;
}

.article-card.new-article {
    background: var(--new-article-bg);
    padding: 30px;
    margin-bottom: 20px;
    border: 2px solid var(--new-article-border);
}

.article-meta {
    display: flex;
    gap: 20px;
    margin-bottom: 10px;
    flex-wrap: wrap;
}

.article-date {
    font-family: var(--mono-font);
    font-size: 0.75rem;
    color: var(--text-faint);
}

.article-title {
    font-family: var(--primary-font);
    font-size: 1.4rem;
    margin-bottom: 12px;
    line-height: 1.3;
    color: var(--text-color);
}

.article-title a {
    color: inherit;
    text-decoration: none;
}

.article-title a:hover {
    color: var(--accent);
}

.article-summary {
    font-size: 0.95rem;
    color: var(--text-muted);
    line-height: 1.7;
    margin-bottom: 15px;
}

.article-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    float: right;
}

.article-source {
    font-family: var(--mono-font);
    font-size: 0.75rem;
    color: var(--text-faint);
}

.read-more {
    font-family: var(--mono-font);
    font-size: 0.8rem;
    color: var(--text-color);
    text-decoration: none;
}

.read-more:hover {
    text-decoration: none;
    color: var(--accent);
}

.ai-badge {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-family: var(--mono-font);
    font-size: 0.7rem;
    color: var(--text-light);
    background: var(--bg-tertiary);
    padding: 3px 8px;
}

.ai-badge::before {
    content: "";
    width: 6px;
    height: 6px;
    background: var(--accent);
    border-radius: 50%;
}

/* Submit Form */
.submit-form {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.submit-form input[type="text"] {
    flex: 1;
    min-width: 200px;
    padding: 12px 15px;
    font-family: var(--mono-font);
    font-size: 0.9rem;
    border: 1px solid var(--border-dark);
    background: var(--bg-color);
    color: var(--text-color);
}

.submit-form input[type="text"]:focus {
    outline: none;
    border-color: var(--accent);
}

.submit-form button {
    padding: 12px 25px;
    font-family: var(--mono-font);
    font-size: 0.85rem;
    background: var(--btn-bg);
    color: var(--btn-text);
    border: none;
    cursor: pointer;
    transition: background 0.3s ease;
}

.submit-form button:hover {
    background: var(--btn-hover);
}

.submit-form button:disabled {
    background: var(--bg-tertiary);
    cursor: not-allowed;
}

/* Article Page */
.back-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: var(--mono-font);
    font-size: 0.85rem;
    color: var(--accent);
    text-decoration: none;
    margin-bottom: 30px;
    transition: opacity 0.3s ease;
}

.back-link:hover {
    opacity: 0.7;
}

.back-link::before {
    content: "←";
}

.article-header {
    margin-bottom: 40px;
    padding-bottom: 30px;
    border-bottom: 1px solid var(--border);
}

.article-content {
    font-size: 1.05rem;
    line-height: 1.9;
    color: var(--text-secondary);
}

.article-content p {
    margin-bottom: 1.5em;
}

.article-content h2 {
    font-family: var(--primary-font);
    font-size: 1.6rem;
    margin: 2em 0 1em 0;
    color: var(--text-color);
}

.article-content h3 {
    font-family: var(--primary-font);
    font-size: 1.3rem;
    margin: 1.8em 0 0.8em 0;
    color: var(--text-color);
}

.article-content ul,
.article-content ol {
    margin: 1em 0 1.5em 0;
    padding-left: 1.5em;
}

.article-content li {
    margin-bottom: 0.5em;
}

.article-content blockquote {
    border-left: 3px solid var(--border);
    padding-left: 20px;
    margin: 1.5em 0;
    font-style: italic;
    color: var(--text-muted);
}

.article-content code {
    font-family: var(--mono-font);
    background: var(--bg-secondary);
    padding: 2px 6px;
    font-size: 0.9em;
}

.article-content pre {
    background: var(--code-bg);
    color: var(--code-text);
    padding: 20px;
    overflow-x: auto;
    margin: 1.5em 0;
}

.article-content pre code {
    background: none;
    padding: 0;
}

.share-section {
    margin-top: 30px;
    padding: 25px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
}

.share-section h4 {
    font-family: var(--mono-font);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-light);
    margin-bottom: 15px;
}

.share-buttons {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.share-btn {
    font-family: var(--mono-font);
    font-size: 0.8rem;
    padding: 10px 20px;
    background: var(--bg-color);
    border: 1px solid var(--border);
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    color: var(--text-color);
}

.share-btn:hover {
    background: var(--btn-bg);
    color: var(--btn-text);
    border-color: var(--btn-bg);
}

.related-section {
    margin-top: 60px;
}

.related-section h3 {
    font-family: var(--primary-font);
    font-size: 1.5rem;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border);
    color: var(--text-color);
}

.related-article {
    padding: 20px 0;
    border-bottom: 1px solid var(--border);
}

.related-article:last-child {
    border-bottom: none;
}

.related-article a {
    text-decoration: none;
    color: inherit;
}

.related-article h4 {
    font-family: var(--primary-font);
    font-size: 1.1rem;
    margin-bottom: 8px;
    transition: color 0.3s ease;
    color: var(--text-color);
}

.related-article a:hover h4 {
    color: var(--accent);
}

/* Load More */
.load-more {
    text-align: center;
    padding: 30px 0;
}

.load-more button {
    font-family: var(--mono-font);
    font-size: 0.85rem;
    padding: 12px 30px;
    background: transparent;
    border: 1px solid var(--border-dark);
    cursor: pointer;
    transition: all 0.3s ease;
    color: var(--text-color);
}

.load-more button:hover {
    background: var(--bg-secondary);
    border-color: var(--text-color);
}

/* Loading & Error */
.loading {
    text-align: center;
    padding: 60px 20px;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

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

.loading-text {
    font-family: var(--mono-font);
    font-size: 0.9rem;
    color: var(--text-light);
}

.error-state {
    text-align: center;
    padding: 60px 20px;
}

.error-state h2 {
    font-family: var(--primary-font);
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--text-color);
}

.error-state p {
    font-family: var(--mono-font);
    font-size: 0.9rem;
    color: var(--text-light);
    margin-bottom: 25px;
}

.error-state a {
    font-family: var(--mono-font);
    font-size: 0.9rem;
    padding: 12px 25px;
    background: var(--btn-bg);
    color: var(--btn-text);
    text-decoration: none;
    transition: background 0.3s ease;
}

.error-state a:hover {
    background: var(--btn-hover);
}

/* Footer */
footer {
    margin-top: 60px;
    padding-top: 30px;
    border-top: 1px solid var(--border);
    text-align: center;
}

.footer-links {
    margin-bottom: 15px;
}

.footer-links a {
    font-family: var(--mono-font);
    font-size: 0.75rem;
    color: var(--text-light);
    text-decoration: none;
    margin: 0 15px;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: var(--text-color);
}

.footer-text {
    font-family: var(--mono-font);
    font-size: 0.7rem;
    color: var(--text-faint);
}

/* Responsive */
@media (max-width: 600px) {
    header {
        flex-direction: column;
        gap: 20px;
    }
    
    .header-right {
        flex-direction: column;
        gap: 15px;
    }
    
    .nav-links {
        gap: 15px;
    }
    
    .hero-title,
    .page-title {
        font-size: 2rem;
    }
    
    .info-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .team-grid,
    .values-grid,
    .benefits-list {
        grid-template-columns: 1fr;
    }
    
    .contact-grid,
    .locations-grid {
        grid-template-columns: 1fr;
    }
    
    .submit-form {
        flex-direction: column;
    }
    
    .submit-form button {
        width: 100%;
    }
    
    .article-title {
        font-size: 1.2rem;
    }
    
    .share-buttons {
        flex-direction: column;
    }
    
    .share-btn {
        text-align: center;
    }
}