/* =============================================
   CSS Variables & Theming
   ============================================= */
:root {
    --font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', 'JetBrains Mono', monospace;
    --max-width: 800px;
    --accent: #a855f7;
    --accent-hover: #c084fc;
    --accent-bg: rgba(168, 85, 247, 0.1);
    --accent-border: rgba(168, 85, 247, 0.2);
    --accent-border-hover: rgba(168, 85, 247, 0.4);
    --accent-bg-hover: rgba(168, 85, 247, 0.2);
    --transition: 0.3s ease;
}

[data-theme="dark"] {
    --bg: #0f0f0f;
    --bg-nav: rgba(15, 15, 15, 0.95);
    --text-primary: #f8fafc;
    --text-body: #e2e8f0;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --border: rgba(255, 255, 255, 0.1);
    --border-subtle: rgba(255, 255, 255, 0.05);
    --card-bg: rgba(255, 255, 255, 0.03);
    --card-bg-hover: rgba(255, 255, 255, 0.06);
    --scrollbar-track: #1a1a1a;
}

[data-theme="light"] {
    --bg: #fafafa;
    --bg-nav: rgba(250, 250, 250, 0.95);
    --text-primary: #0f172a;
    --text-body: #1e293b;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --border: rgba(0, 0, 0, 0.1);
    --border-subtle: rgba(0, 0, 0, 0.05);
    --card-bg: rgba(0, 0, 0, 0.02);
    --card-bg-hover: rgba(0, 0, 0, 0.05);
    --scrollbar-track: #e2e8f0;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--text-body);
    background-color: var(--bg);
    overflow-x: hidden;
    transition: background-color var(--transition), color var(--transition);
}

/* =============================================
   Layout
   ============================================= */
.main-content {
    min-height: 100vh;
    padding: 2rem 0;
}

.content-wrapper {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

/* =============================================
   Navigation
   ============================================= */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: var(--bg-nav);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 1rem 2rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
}

.nav-container {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-left: auto;
    flex-shrink: 0;
}

.nav-link {
    text-decoration: none;
    color: var(--text-body);
    font-weight: 400;
    font-size: 0.9rem;
    text-transform: lowercase;
    transition: color var(--transition);
    position: relative;
    padding: 0.5rem 0;
}

.nav-link:hover,
.nav-link.active {
    color: var(--accent);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--accent);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    z-index: 1001;
}

.hamburger-line {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-body);
    transition: transform var(--transition), opacity var(--transition);
}

.mobile-menu-toggle.active .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle.active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* =============================================
   Hero Section
   ============================================= */
.hero {
    padding: 8rem 0 4rem 0;
}

.hero-title {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 2rem;
    line-height: 1.2;
    color: var(--text-primary);
}

.highlight {
    color: var(--accent);
    font-weight: 700;
}

.hero-description {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.hero-description p {
    margin-bottom: 1.5rem;
}

/* Social Links (below hero) */
.social-links {
    display: flex;
    justify-content: center;
    gap: 1.25rem;
    margin-top: 0.5rem;
}

.social-links a {
    color: var(--text-muted);
    transition: color var(--transition), transform var(--transition);
    display: flex;
    align-items: center;
}

.social-links a:hover {
    color: var(--accent);
    transform: translateY(-1px);
}

.link {
    color: var(--accent);
    text-decoration: underline;
    text-decoration-color: var(--accent-border);
    transition: color var(--transition), text-decoration-color var(--transition);
}

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

/* =============================================
   Section Styles
   ============================================= */
.section {
    padding: 4rem 0;
    border-top: 1px solid var(--border);
}

.section-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 2rem;
    text-transform: lowercase;
}

.section-content {
    color: var(--text-secondary);
    line-height: 1.7;
}

.section-content p {
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
}




/* =============================================
   Talks & Musings Pages
   ============================================= */
.talk-item,
.musing-item {
    margin-bottom: 2.5rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-subtle);
}

.talk-item:last-child,
.musing-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.talk-title,
.musing-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.talk-date,
.musing-date {
    color: var(--text-muted);
    font-size: 0.8rem;
    margin-bottom: 0.25rem;
}

.talk-event {
    color: var(--accent);
    font-size: 0.85rem;
    margin-top: 0.25rem;
}

.talk-description {
    color: var(--text-secondary);
    font-size: 0.85rem;
    line-height: 1.6;
    margin-top: 0.5rem;
}

/* =============================================
   Musing List Styles
   ============================================= */
.musing-link {
    display: block;
    text-decoration: none;
    color: inherit;
    padding: 1.5rem;
    margin: -1.5rem;
    border-radius: 8px;
    transition: background var(--transition);
}

.musing-link:hover {
    background: var(--card-bg-hover);
}

.musing-link .musing-title {
    transition: color var(--transition);
}

.musing-link:hover .musing-title {
    color: var(--accent);
}

.musing-excerpt {
    color: var(--text-secondary);
    font-size: 0.85rem;
    line-height: 1.6;
    margin-top: 0.5rem;
}

.musing-back {
    margin-bottom: 1.5rem;
    font-size: 0.85rem;
}

/* =============================================
   Musing Article Styles
   ============================================= */
.musing-full h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-top: 2rem;
    margin-bottom: 0.75rem;
}

.musing-full p {
    color: var(--text-secondary);
    font-size: 0.85rem;
    line-height: 1.7;
    margin-bottom: 1rem;
}

.musing-full ul {
    list-style: none;
    padding-left: 1rem;
    margin-bottom: 1rem;
}

.musing-full ul li {
    color: var(--text-secondary);
    font-size: 0.85rem;
    line-height: 1.7;
    padding: 0.2rem 0;
    position: relative;
    padding-left: 1rem;
}

.musing-full ul li::before {
    content: '-';
    position: absolute;
    left: 0;
    color: var(--text-muted);
}

.musing-full code {
    background: var(--card-bg);
    border: 1px solid var(--border);
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    font-size: 0.8rem;
    color: var(--accent);
}

.musing-full pre {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 1.25rem;
    margin-bottom: 1rem;
    overflow-x: auto;
}

.musing-full pre code {
    background: none;
    border: none;
    padding: 0;
    font-size: 0.8rem;
    color: var(--text-body);
    line-height: 1.6;
}

.musing-full strong {
    color: var(--text-primary);
    font-weight: 600;
}

/* =============================================
   Footer
   ============================================= */
.footer {
    border-top: 1px solid var(--border);
    padding: 2rem 0;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 1rem;
}

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

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

/* =============================================
   Theme Toggle
   ============================================= */
.theme-toggle {
    background: var(--accent-bg);
    border: 1px solid var(--accent-border);
    color: var(--accent);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background var(--transition), border-color var(--transition), transform var(--transition);
    flex-shrink: 0;
}

.theme-toggle:hover {
    background: var(--accent-bg-hover);
    border-color: var(--accent-border-hover);
    transform: scale(1.1);
}

/* Show/hide icons based on theme */
[data-theme="dark"] .theme-icon-light {
    display: none;
}

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

/* =============================================
   Responsive Design
   ============================================= */
@media (max-width: 768px) {
    .content-wrapper {
        padding: 0 1.5rem;
    }

    .nav-container {
        position: static;
        transform: none;
        padding: 0;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--bg-nav);
        backdrop-filter: blur(10px);
        -webkit-backdrop-filter: blur(10px);
        padding: 1rem 2rem 2rem;
        gap: 0;
        border-bottom: 1px solid var(--border);
    }

    .nav-menu.open {
        display: flex;
    }

    .nav-menu li {
        padding: 0.5rem 0;
    }

    .hero-title {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .content-wrapper {
        padding: 0 1rem;
    }

    .nav-container {
        padding: 0 1rem;
    }

    .hero-title {
        font-size: 1.3rem;
    }

    .section-title {
        font-size: 1.1rem;
    }
}

/* =============================================
   Reduced Motion
   ============================================= */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}

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

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

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

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

/* =============================================
   Selection & Focus
   ============================================= */
::selection {
    background: rgba(168, 85, 247, 0.3);
    color: var(--text-primary);
}

*:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* =============================================
   Animations
   ============================================= */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}