/* ===== CSS Variables ===== */
:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --text-primary: #1a1a1a;
    --text-secondary: #4a5568;
    --text-tertiary: #718096;
    --accent: #3182ce;
    --accent-hover: #2c5282;
    --border: #e2e8f0;
    --shadow: rgba(0, 0, 0, 0.05);

    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Consolas', 'Monaco', monospace;

    --transition: all 0.2s ease;
}

[data-theme="dark"] {
    --bg-primary: #0f1419;
    --bg-secondary: #1a1f2e;
    --text-primary: #e6edf3;
    --text-secondary: #9198a1;
    --text-tertiary: #6e7681;
    --accent: #58a6ff;
    --accent-hover: #79c0ff;
    --border: #30363d;
    --shadow: rgba(0, 0, 0, 0.3);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: var(--transition);
}

/* ===== Theme Toggle ===== */
.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 1px solid var(--border);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    z-index: 1000;
    box-shadow: 0 2px 8px var(--shadow);
}

.theme-toggle:hover {
    background-color: var(--bg-secondary);
    transform: scale(1.05);
}

.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;
}

/* ===== Container ===== */
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 60px 24px;
}

/* ===== Header ===== */
.header {
    margin-bottom: 48px;
    padding-bottom: 32px;
    border-bottom: 1px solid var(--border);
}

.name {
    font-size: 2.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    letter-spacing: -0.02em;
}

.tagline {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
    font-weight: 400;
}

.clearance-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--accent);
    border-radius: 6px;
    color: var(--accent);
    font-weight: 500;
    font-size: 0.9rem;
    margin-bottom: 16px;
}

.clearance-badge svg {
    flex-shrink: 0;
}

.contact-info {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.contact-link {
    color: var(--accent);
    text-decoration: none;
    transition: var(--transition);
}

.contact-link:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

.separator {
    color: var(--text-tertiary);
}

.location {
    color: var(--text-secondary);
}

.social-links {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.social-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-family: var(--font-mono);
    transition: var(--transition);
    padding: 4px 8px;
    border-radius: 4px;
}

.social-link:hover {
    color: var(--accent);
    background-color: var(--bg-secondary);
}

.social-link svg {
    flex-shrink: 0;
}

/* ===== Sections ===== */
.section {
    margin-bottom: 48px;
}

.section-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 24px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--accent);
    display: inline-block;
}

/* ===== Summary ===== */
.summary-text {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ===== Entry (Education, Experience, Projects) ===== */
.entry {
    margin-bottom: 32px;
}

.entry:last-child {
    margin-bottom: 0;
}

.entry-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 16px;
    margin-bottom: 8px;
    flex-wrap: wrap;
}

.entry-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    flex: 1;
}

.entry-date {
    font-size: 0.875rem;
    color: var(--text-tertiary);
    font-family: var(--font-mono);
    white-space: nowrap;
}

.entry-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
    font-weight: 500;
}

.entry-detail {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.entry-list {
    list-style: none;
    padding-left: 0;
    margin: 12px 0;
}

.entry-list li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 8px;
    color: var(--text-secondary);
    line-height: 1.7;
}

.entry-list li::before {
    content: "▹";
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: bold;
}

.role-subtitle {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-top: 16px;
    margin-bottom: 8px;
}

.project-description {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 8px;
}

.project-link {
    color: var(--accent);
    text-decoration: none;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    transition: var(--transition);
}

.project-link:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

.tech-stack {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--text-tertiary);
    margin-top: 12px;
}

/* ===== Skills ===== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
}

.skill-group {
    padding: 16px;
    background-color: var(--bg-secondary);
    border-radius: 6px;
    border: 1px solid var(--border);
    transition: var(--transition);
}

.skill-group:hover {
    border-color: var(--accent);
}

.skill-category {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.skill-items {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===== Awards ===== */
.awards-list {
    list-style: none;
    padding-left: 0;
}

.awards-list li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 8px;
    color: var(--text-secondary);
    line-height: 1.7;
}

.awards-list li::before {
    content: "▹";
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: bold;
}

/* ===== Additional Info ===== */
.additional-info-grid {
    display: grid;
    gap: 12px;
}

.additional-info {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 0;
}

/* ===== Footer ===== */
.footer {
    margin-top: 64px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
    text-align: center;
    color: var(--text-tertiary);
    font-size: 0.875rem;
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    .container {
        padding: 40px 20px;
    }

    .name {
        font-size: 2rem;
    }

    .tagline {
        font-size: 1rem;
    }

    .contact-info {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
    }

    .separator {
        display: none;
    }

    .entry-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
    }

    .entry-date {
        font-size: 0.8rem;
    }

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

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

    .theme-toggle {
        top: 16px;
        right: 16px;
        width: 40px;
        height: 40px;
    }
}

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

    .container {
        padding: 32px 16px;
    }
}

/* ===== Print Styles ===== */
@media print {
    body {
        background-color: white;
        color: black;
    }

    .theme-toggle {
        display: none;
    }

    .container {
        max-width: 100%;
        padding: 0;
    }

    .section {
        page-break-inside: avoid;
    }

    a {
        color: black;
        text-decoration: none;
    }

    .social-link,
    .contact-link,
    .project-link {
        color: black;
    }
}