/* GitHub Dark Theme Variables */
:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #1f2428;
    --border: #30363d;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --accent-blue: #58a6ff;
    --accent-green: #238636;
    --accent-orange: #f0883e;
    --accent-purple: #a371f7;
    --accent-yellow: #d29922;
    --accent-red: #f85149;
    --code-comment: #8b949e;
    --font-heading: "JetBrains Mono", monospace;
    --font-body: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --font-code: "Fira Code", "Consolas", "Monaco", monospace;
    
    /* Syntax highlighting */
    --syn-keyword: #ff7b72;
    --syn-string: #a5d6ff;
    --syn-number: #79c0ff;
    --syn-function: #d2a8ff;
    --syn-comment: #8b949e;
    --syn-class: #ffa657;
    --syn-builtin: #ffa657;
    --syn-atom: #ff7b72;
}

/* Reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    min-height: 100vh;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
    z-index: 100;
}

.header-content {
    display: flex;
    align-items: baseline;
    gap: 1rem;
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.logo-sub {
    font-weight: 400;
    color: var(--text-secondary);
}

.tagline {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.header-link {
    color: var(--accent-blue);
    text-decoration: none;
    font-size: 0.9rem;
}

.header-link:hover {
    text-decoration: underline;
}

/* Menu */
.menu {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.menu-item {
    position: relative;
}

.menu-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    padding: 0.25rem 0;
    transition: color 0.15s ease;
}

.menu-link:hover,
.menu-link.active {
    color: var(--text-primary);
}

.menu-link.active {
    border-bottom: 2px solid var(--accent-blue);
}

.dropdown {
    position: relative;
}

.dropdown-content {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 4px;
    min-width: 180px;
    padding: 0.5rem 0;
    z-index: 200;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.dropdown:hover .dropdown-content {
    display: block;
}

.dropdown-content a {
    display: block;
    padding: 0.5rem 1rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    transition: all 0.15s ease;
}

.dropdown-content a:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.dropdown-content a.active {
    color: var(--accent-blue);
    background: var(--bg-tertiary);
}

/* Logo Link */
.logo-link {
    color: var(--text-primary);
    text-decoration: none;
}

/* Centered Content */
.main-content.centered {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: calc(100vh - 60px);
    padding-top: 4rem;
}

.hero {
    text-align: center;
    max-width: 700px;
    padding-top: 4rem;
}

.hero-tagline {
    font-size: 1.4rem;
    line-height: 1.7;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

.hero-tagline .accent {
    color: var(--accent-blue);
    font-family: var(--font-heading);
}

.hero-interests {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 2rem;
}

.interest-tag {
    font-family: var(--font-code);
    font-size: 0.8rem;
    padding: 0.4rem 0.8rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 20px;
    color: var(--text-secondary);
    transition: all 0.2s ease;
}

.interest-tag:hover {
    border-color: var(--accent-blue);
    color: var(--text-primary);
}

.hero-links {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 2rem;
}

.hero-btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background: var(--accent-blue);
    color: var(--bg-primary);
    font-family: var(--font-heading);
    font-size: 0.9rem;
    font-weight: 500;
    border-radius: 6px;
    text-decoration: none;
    transition: all 0.2s ease;
}

.hero-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(88, 166, 255, 0.3);
}

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

.hero-btn.secondary:hover {
    border-color: var(--accent-blue);
    box-shadow: none;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.card {
    display: block;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
    text-decoration: none;
    transition: all 0.2s ease;
}

.card:hover {
    border-color: var(--accent-blue);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.card h2 {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin: 0;
}

/* Sidebar */
.sidebar {
    position: fixed;
    top: 60px;
    left: 0;
    width: 220px;
    height: calc(100vh - 60px);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    padding: 1.5rem 0;
    overflow-y: auto;
}

.nav-header {
    font-family: var(--font-heading);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    padding: 0 1.5rem;
    margin-bottom: 0.75rem;
}

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

.nav-list li a {
    display: block;
    padding: 0.5rem 1.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: all 0.15s ease;
}

.nav-list li a:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

.hero-title {
    margin-bottom: 0.5rem;
}

.accent-heading {
    display: inline-block;
    font-size: 2.4rem;   /* slightly larger */
    font-weight: 100;    /* bolder */
}
.nav-list li a.active {
    color: var(--accent-blue);
    background: var(--bg-tertiary);
    border-left: 2px solid var(--accent-blue);
    padding-left: calc(1.5rem - 2px);
}

/* Main Content */
.main-content {
    margin-left: 220px;
    margin-top: 60px;
    padding: 2rem 3rem;
    max-width: 900px;
}

/* Sections */
.section {
    margin-bottom: 3rem;
    scroll-margin-top: 80px;
}

.section h2 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1.25rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border);
}

.subsection {
    margin-bottom: 1.5rem;
}

.subsection h3 {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

/* Code Blocks */
.code-block {
    background: var(--bg-tertiary);
    border-left: 3px solid var(--accent-orange);
    border-radius: 4px;
    padding: 1rem 1.25rem;
    margin: 0.75rem 0;
    overflow-x: auto;
}

.code-block code,
.code-block pre {
    font-family: var(--font-code);
    font-size: 0.875rem;
    color: var(--text-primary);
    white-space: pre;
}

.code-block pre {
    margin: 0;
}

.code-line {
    line-height: 1.6;
}

.code-comment {
    color: var(--code-comment);
    font-style: italic;
}

/* Syntax Highlighting */
.code-keyword { color: var(--syn-keyword); }
.code-string { color: var(--syn-string); }
.code-number { color: var(--syn-number); }
.code-function { color: var(--syn-function); }
.code-comment { color: var(--syn-comment); font-style: italic; }
.code-class { color: var(--syn-class); }
.code-builtin { color: var(--syn-builtin); }
.code-atom { color: var(--syn-atom); }

/* Tables */
.command-table,
.keybind-table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
    font-size: 0.9rem;
}

.command-table th,
.command-table td,
.keybind-table th,
.keybind-table td {
    text-align: left;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border);
}

.command-table th,
.keybind-table th {
    background: var(--bg-secondary);
    font-family: var(--font-heading);
    font-weight: 500;
    color: var(--text-primary);
}

.command-table td,
.keybind-table td {
    background: var(--bg-primary);
}

.command-table code,
.keybind-table code {
    color: var(--accent-orange);
    font-family: var(--font-code);
    font-size: 0.85rem;
    background: var(--bg-tertiary);
    padding: 0.15rem 0.4rem;
    border-radius: 3px;
}

/* Keycap Style */
.key {
    display: inline-block;
    font-family: var(--font-code);
    font-size: 0.75rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 0.2rem 0.5rem;
    color: var(--accent-orange);
    white-space: nowrap;
}

.keybind-row {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.5rem 0;
}

/* Note Boxes */
.note {
    padding: 0.75rem 1rem;
    border-left: 3px solid var(--accent-blue);
    margin: 1rem 0;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.note strong {
    color: var(--text-primary);
}

.note-tip {
    border-left-color: var(--accent-green);
}

.note-warning {
    border-left-color: var(--accent-yellow);
}

.note-info {
    border-left-color: var(--accent-blue);
}

/* Mode Cards */
.mode-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1rem;
    margin: 1rem 0;
}

.mode-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 1.25rem;
}

.mode-card h4 {
    font-family: var(--font-heading);
    font-size: 1rem;
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.mode-indicator {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.mode-plan .mode-indicator {
    background: var(--accent-purple);
}

.mode-build .mode-indicator {
    background: var(--accent-green);
}

.mode-card ul {
    list-style: none;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.mode-card li {
    padding: 0.25rem 0;
    padding-left: 1rem;
    position: relative;
}

.mode-card li::before {
    content: "›";
    position: absolute;
    left: 0;
    color: var(--text-secondary);
}

/* Tip Grid */
.tip-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.tip-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 1.25rem;
}

.tip-item h4 {
    font-family: var(--font-heading);
    font-size: 0.95rem;
    color: var(--accent-green);
    margin-bottom: 0.5rem;
}

.tip-item p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Projects Grid */
.section-intro {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 1.5rem;
}

.project-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
    transition: all 0.25s ease;
    position: relative;
    overflow: hidden;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-blue));
    opacity: 0;
    transition: opacity 0.25s ease;
}

.project-card:hover {
    border-color: var(--accent-blue);
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.project-card:hover::before {
    opacity: 1;
}

.project-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.75rem;
}

.project-icon {
    font-size: 1.75rem;
    filter: grayscale(20%);
    transition: filter 0.2s ease;
}

.project-card:hover .project-icon {
    filter: grayscale(0%);
}

.project-priority {
    font-family: var(--font-code);
    font-size: 0.7rem;
    font-weight: 600;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    text-transform: uppercase;
}

.priority-high {
    background: rgba(248, 81, 73, 0.15);
    color: var(--accent-red);
    border: 1px solid rgba(248, 81, 73, 0.3);
}

.priority-medium {
    background: rgba(210, 153, 34, 0.15);
    color: var(--accent-yellow);
    border: 1px solid rgba(210, 153, 34, 0.3);
}

.priority-low {
    background: rgba(35, 134, 54, 0.15);
    color: var(--accent-green);
    border: 1px solid rgba(35, 134, 54, 0.3);
}

.project-title {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.project-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.project-progress {
    margin-bottom: 1rem;
}

.progress-bar {
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 0.35rem;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-blue));
    border-radius: 3px;
    transition: width 0.3s ease;
}

.progress-text {
    font-family: var(--font-code);
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.tag {
    font-family: var(--font-code);
    font-size: 0.7rem;
    padding: 0.2rem 0.5rem;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: 12px;
    color: var(--text-secondary);
    transition: all 0.2s ease;
}

.tag:hover {
    border-color: var(--accent-blue);
    color: var(--accent-blue);
}

/* Links */
a {
    color: var(--accent-blue);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* Lists */
ul, ol {
    margin: 0.75rem 0;
    padding-left: 1.5rem;
    color: var(--text-secondary);
}

li {
    margin: 0.25rem 0;
}

p {
    color: var(--text-secondary);
    margin: 0.5rem 0;
}

/* Footer */
.footer {
    margin-top: 4rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.footer p {
    margin: 0.5rem 0;
}

/* Responsive */
@media (max-width: 768px) {
    .header {
        padding: 0 1rem;
    }

    .header-content {
        flex-direction: column;
        gap: 0.25rem;
    }

    .tagline {
        display: none;
    }

    .menu {
        display: none;
    }

    .sidebar {
        display: none;
    }

    .main-content {
        margin-left: 0;
        padding: 1.5rem 1rem;
    }

    .main-content.centered {
        padding: 2rem 1rem;
    }

    .hero-tagline {
        font-size: 1.1rem;
    }

    .hero-links {
        flex-direction: column;
        align-items: center;
    }

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

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

    .code-block {
        padding: 0.75rem 1rem;
        font-size: 0.8rem;
    }

    .mode-cards,
    .tip-grid {
        grid-template-columns: 1fr;
    }

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

    .command-table,
    .keybind-table {
        font-size: 0.8rem;
    }

    .command-table th,
    .command-table td,
    .keybind-table th,
    .keybind-table td {
        padding: 0.5rem;
    }
}

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

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

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

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

/* Selection */
::selection {
    background: var(--accent-blue);
    color: var(--bg-primary);
}

/* Form Styles */
.contact-form {
    max-width: 500px;
    margin-top: 2rem;
}

.form-group {
    margin-bottom: 1.25rem;
}

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

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.95rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.15);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-secondary);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 6px;
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s;
}

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

.btn-primary:hover {
    background: #2ea043;
}

.btn-primary:active {
    transform: scale(0.98);
}