:root {
    --bg: #f5f7fa;
    --bg-sidebar: #ffffff;
    --text: #1e293b;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --accent: #0ea5e9;
    --accent-hover: #0284c7;
    --accent-light: #e0f2fe;
    --accent-secondary: #8b5cf6;
    --border: #cbd5e1;
    --card-bg: #ffffff;
    --success: #10b981;
}

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

body {
    font-family: 'IBM Plex Sans', -apple-system, sans-serif;
    font-weight: 300;
    font-size: 18px;
    line-height: 1.7;
    color: var(--text);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
}

/* Sidebar Navigation */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: 220px;
    height: 100vh;
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    padding: 32px 24px;
}

.nav-header {
    margin-bottom: 48px;
}

.logo {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 20px;
    font-weight: 500;
    color: var(--accent);
    text-decoration: none;
    letter-spacing: -1px;
}

.nav-links {
    list-style: none;
    flex: 1;
}

.nav-links li {
    margin-bottom: 8px;
}

.nav-links a {
    display: block;
    padding: 8px 12px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 16px;
    border-radius: 6px;
    transition: all 0.2s ease;
}

.nav-links a:hover {
    color: var(--accent);
    background: var(--accent-light);
    font-weight: 500;
}

.nav-links a.active {
    color: var(--accent);
    background: var(--accent-light);
    font-weight: 500;
}

.nav-footer {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
}

.nav-footer a {
    font-size: 14px;
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.2s;
}

.nav-footer a:hover {
    color: var(--accent);
}

/* Main Content */
.content {
    margin-left: 220px;
    min-height: 100vh;
    padding: 64px;
}

.page-content {
    max-width: 800px;
}

h1 {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 42px;
    font-weight: 500;
    letter-spacing: -0.5px;
    margin-bottom: 12px;
    color: var(--text);
}

h2 {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--accent);
    margin-bottom: 20px;
    margin-top: 48px;
}

h3 {
    font-size: 24px;
    font-weight: 500;
    margin-bottom: 6px;
}

h4 {
    font-size: 14px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    margin-bottom: 14px;
}

p {
    color: var(--text-secondary);
}

/* Home Page */
.greeting {
    font-size: 16px;
    color: var(--accent);
    font-weight: 500;
    margin-bottom: 6px;
}

.subtitle {
    font-size: 22px;
    color: var(--text-muted);
    margin-bottom: 32px;
}

.intro {
    margin-bottom: 48px;
}

.intro p {
    margin-bottom: 16px;
    font-size: 19px;
    line-height: 1.8;
}

.quick-stats {
    display: flex;
    gap: 48px;
    margin-bottom: 48px;
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 42px;
    font-weight: 500;
    color: var(--accent);
    background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 15px;
    color: var(--text-muted);
}

.cta {
    display: flex;
    gap: 12px;
}

.btn {
    display: inline-block;
    padding: 14px 28px;
    font-size: 16px;
    font-weight: 400;
    text-decoration: none;
    border-radius: 6px;
    transition: all 0.2s ease;
}

.btn:not(.btn-outline) {
    background: var(--accent);
    color: white;
}

.btn:not(.btn-outline):hover {
    background: var(--accent-hover);
}

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

.btn-outline:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-light);
}

/* About Page */
.about-section {
    margin-bottom: 48px;
}

.edu-card {
    padding: 24px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    border-left: 4px solid var(--accent);
}

.edu-card h3 {
    color: var(--text);
}

.degree {
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.details {
    font-size: 15px;
    color: var(--text-muted);
}

.skills-grid {
    display: grid;
    gap: 32px;
}

.skill-category {
    margin-bottom: 8px;
}

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

.skill-tags span {
    padding: 8px 14px;
    background: var(--accent-light);
    color: var(--accent);
    font-size: 15px;
    border-radius: 6px;
    font-weight: 500;
    border: 1px solid rgba(14, 165, 233, 0.2);
}

.cert-list {
    list-style: none;
}

.cert-list li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 0;
    border-bottom: 1px solid var(--border);
}

.cert-list li:last-child {
    border-bottom: none;
}

.cert-name {
    font-weight: 400;
    color: var(--text);
}

.cert-issuer {
    font-size: 15px;
    color: var(--text-muted);
}

/* Experience Page */
.timeline {
    position: relative;
}

.exp-card {
    display: grid;
    grid-template-columns: 160px 1fr;
    gap: 32px;
    padding: 32px 0;
    border-bottom: 1px solid var(--border);
}

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

.exp-date {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 14px;
    color: var(--text-muted);
    padding-top: 4px;
}

.exp-content h3 {
    color: var(--text);
}

.exp-role {
    font-size: 16px;
    color: var(--accent);
    margin-bottom: 16px;
}

.exp-points {
    list-style: none;
}

.exp-points li {
    position: relative;
    padding-left: 16px;
    margin-bottom: 10px;
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.7;
}

.exp-points li::before {
    content: "–";
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: 600;
}

/* Projects Page */
.projects-grid {
    display: grid;
    gap: 24px;
}

.project-card {
    padding: 28px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    transition: all 0.2s ease;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.project-card:hover {
    border-color: var(--accent);
    box-shadow: 0 4px 12px rgba(14, 165, 233, 0.15);
    transform: translateY(-2px);
}

.project-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
}

.project-tag {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 6px 10px;
    background: linear-gradient(135deg, var(--accent-light), #bae6fd);
    color: var(--accent);
    border-radius: 4px;
    font-weight: 600;
}

.project-event {
    font-size: 15px;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.project-achievement {
    font-size: 14px;
    color: var(--accent);
    font-weight: 600;
    margin-bottom: 12px;
    display: inline-block;
    padding: 4px 12px;
    background: var(--accent-light);
    border-radius: 12px;
}

.project-desc {
    font-size: 16px;
    margin-bottom: 16px;
    line-height: 1.7;
}

.project-links {
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.project-links a {
    color: var(--accent);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    transition: color 0.2s ease;
}

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

.link-sep {
    color: var(--text-muted);
    font-size: 14px;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.project-tech span {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 13px;
    padding: 6px 10px;
    background: #f1f5f9;
    color: var(--text-secondary);
    border-radius: 4px;
    border: 1px solid var(--border);
}

/* Research Page */
.research-areas {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-top: 24px;
}

.research-card {
    padding: 24px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    border-left: 4px solid var(--accent);
    transition: all 0.2s ease;
}

.research-card:hover {
    box-shadow: 0 4px 12px rgba(14, 165, 233, 0.15);
    transform: translateY(-2px);
}

.research-card h3 {
    font-size: 20px;
    margin-bottom: 12px;
    color: var(--text);
}

.research-card p {
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-secondary);
}

/* Hobbies Page */
.hobbies-intro {
    font-size: 20px;
    margin-bottom: 40px;
}

.hobbies-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-bottom: 40px;
}

.hobby-card {
    padding: 24px;
    background: white;
    border: 1px solid var(--border);
    border-radius: 8px;
}

.hobby-icon {
    font-size: 24px;
    margin-bottom: 12px;
}

.hobby-card h3 {
    font-size: 16px;
    margin-bottom: 8px;
}

.hobby-card p {
    font-size: 14px;
}

.hobbies-note {
    font-size: 14px;
    color: var(--text-muted);
    font-style: italic;
}

/* Hiking Section */
.hiking-trails {
    display: grid;
    gap: 24px;
}

.trail-card {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 32px;
    padding: 32px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    transition: all 0.2s ease;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.trail-card:hover {
    box-shadow: 0 4px 12px rgba(14, 165, 233, 0.15);
    border-color: var(--accent);
}

.trail-image {
    width: 100%;
    height: 220px;
    border-radius: 8px;
    overflow: hidden;
    background: var(--accent-light);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.trail-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 8px;
    display: block;
    transition: transform 0.3s ease;
}

.trail-card:hover .trail-image img {
    transform: scale(1.05);
}

.trail-info h3 {
    font-size: 24px;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--text);
}

.trail-location {
    font-size: 16px;
    color: var(--accent);
    font-weight: 500;
    margin-bottom: 14px;
}

.trail-desc {
    font-size: 17px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        bottom: 0;
        top: auto;
        left: 0;
        right: 0;
        width: 100%;
        height: auto;
        flex-direction: row;
        padding: 12px 16px;
        border-right: none;
        border-top: 1px solid var(--border);
        z-index: 100;
    }

    .nav-header,
    .nav-footer {
        display: none;
    }

    .nav-links {
        display: flex;
        justify-content: space-around;
        width: 100%;
    }

    .nav-links li {
        margin-bottom: 0;
    }

    .nav-links a {
        padding: 8px;
        font-size: 12px;
    }

    .content {
        margin-left: 0;
        padding: 32px 20px 80px;
    }

    h1 {
        font-size: 36px;
    }

    .quick-stats {
        gap: 24px;
    }

    .stat-number {
        font-size: 36px;
    }

    .exp-card {
        grid-template-columns: 1fr;
        gap: 8px;
    }

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

    .research-areas {
        grid-template-columns: 1fr;
    }

    .trail-card {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .trail-image {
        height: 240px;
    }

    .cta {
        flex-direction: column;
    }
}