:root {
    --color-dark: #0f0f0f;
    --color-light: #fafafa;
    --color-bg: var(--color-light);
    --color-text: var(--color-dark);
    --color-text-secondary: #6b7280;
    --color-border: #e5e7eb;
    --color-accent: #3b82f6;
    --font-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --max-width: 680px;
    --spacing: 1.25rem;
    --radius: 6px;
    --transition: all 0.2s ease;
}

:root.dark {
    --color-bg: var(--color-dark);
    --color-text: var(--color-light);
    --color-text-secondary: #9ca3af;
    --color-border: #262626;
    --color-accent: #60a5fa;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

::selection {
    background: var(--color-text);
    color: var(--color-bg);
}

.header-container {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    padding: 1rem var(--spacing);
}

:root.dark .header-container {
    background: rgba(15, 15, 15, 0.8);
}

.navbar {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
}

.site-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text);
    text-decoration: none;
    letter-spacing: -0.01em;
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 0.9375rem;
    font-weight: 500;
    transition: var(--transition);
}

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

.nav-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.theme-toggle,
.menu-toggle {
    background: none;
    border: none;
    color: var(--color-text);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.theme-toggle:hover,
.menu-toggle:hover {
    background-color: var(--color-border);
}

.icon {
    width: 1em;
    height: 1em;
    vertical-align: -0.125em;
    fill: currentColor;
    stroke: currentColor;
}

.theme-toggle .moon-icon,
.theme-toggle .sun-icon {
    width: 1.25rem;
    height: 1.25rem;
}

.theme-toggle .moon-icon path,
.theme-toggle .sun-icon path {
    fill: currentColor;
    stroke: currentColor;
}

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

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

:root.dark .theme-toggle .moon-icon {
    display: none;
}

:root.dark .theme-toggle .sun-icon {
    display: block;
}

.menu-toggle .icon {
    width: 1.5rem;
    height: 1.5rem;
    stroke: currentColor;
    fill: none;
}

.menu-toggle {
    display: none;
}

.mobile-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--color-bg);
    border-left: 1px solid var(--color-border);
    transition: right 0.3s ease;
    z-index: 200;
    padding: 2rem;
}

.mobile-nav.open {
    right: 0;
}

.mobile-nav-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 3rem;
}

.mobile-nav-title {
    font-size: 1rem;
    font-weight: 600;
}

.close-nav {
    background: none;
    border: none;
    color: var(--color-text);
    cursor: pointer;
    padding: 0.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.close-nav .icon {
    width: 1.5rem;
    height: 1.5rem;
    stroke: currentColor;
    fill: none;
}

.mobile-nav-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.mobile-nav-links a {
    color: var(--color-text);
    text-decoration: none;
    font-size: 1.125rem;
    font-weight: 500;
    display: block;
    transition: var(--transition);
}

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

.nav-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 150;
}

.nav-overlay.open {
    opacity: 1;
    visibility: visible;
}

.main-content-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing);
}

section {
    padding: clamp(3rem, 8vw, 5rem) 0;
}

.hero-section {
    padding: clamp(5rem, 12vw, 8rem) 0 clamp(4rem, 10vw, 6rem);
}

.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: 999px;
    font-size: 0.875rem;
    margin-bottom: 2rem;
    color: var(--color-text-secondary);
}

.status-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: #10b981;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 3.5rem);
    margin-bottom: 1rem;
    font-weight: 600;
    letter-spacing: -0.03em;
    line-height: 1.1;
}

.hero-subtitle {
    font-size: clamp(1.125rem, 2.5vw, 1.375rem);
    color: var(--color-text-secondary);
    font-weight: 400;
    margin-bottom: 2.5rem;
}

.social-links {
    display: flex;
    gap: 0.75rem;
}

.social-links a {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--color-border);
    border-radius: 50%;
    text-decoration: none;
    color: var(--color-text);
    transition: var(--transition);
}

.social-links a:hover {
    background: var(--color-border);
    border-color: var(--color-text);
}

.social-links a .icon {
    width: 1.456rem;
    height: 1.456rem;
    transition-duration: .25s;
}

.social-links a:hover .icon {
    width: 2rem;
    height: 2rem;
    rotate: -5deg;
}

.social-links a[aria-label="GitHub"] .icon path {
    fill: currentColor;
    stroke: none;
}

.social-links a[aria-label="Email"] .icon path {
    fill: none;
    stroke: currentColor;
    stroke-width: 2;
}

.section-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 2rem;
    letter-spacing: -0.02em;
}

.about-content p {
    font-size: 1.0625rem;
    margin-bottom: 1.25rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.activity-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.activity-link {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    transition: var(--transition);
}

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

.activity-link .icon {
    width: 0.875rem;
    height: 0.875rem;
    stroke: currentColor;
    fill: none;
}

.contribution-calendar {
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.25rem;
}

.calendar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.calendar-month-label {
    font-size: 0.875rem;
    color: var(--color-text);
    font-weight: 600;
}

.calendar-grid-container {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.calendar-day-labels {
    display: grid;
    grid-template-columns: repeat(7, 14px);
    gap: 3px;
    padding-left: 0;
    margin-bottom: 4px;
}

.calendar-day-label {
    font-size: 0.625rem;
    color: var(--color-text-secondary);
    text-align: center;
    font-weight: 500;
}

.calendar-weeks {
    display: flex;
    flex-direction: column;
    gap: 3px;
}

.calendar-week {
    display: grid;
    grid-template-columns: repeat(7, 14px);
    gap: 3px;
}

.calendar-day {
    width: 14px;
    height: 14px;
    border-radius: 2px;
    position: relative;
    cursor: pointer;
    transition: var(--transition);
}

.calendar-day.empty {
    background: transparent;
    cursor: default;
}

.calendar-day[data-level="0"] {
    background: var(--color-border);
}

.calendar-day[data-level="1"] {
    background: color-mix(in srgb, var(--color-text) 25%, transparent);
}

.calendar-day[data-level="2"] {
    background: color-mix(in srgb, var(--color-text) 50%, transparent);
}

.calendar-day[data-level="3"] {
    background: color-mix(in srgb, var(--color-text) 75%, transparent);
}

.calendar-day[data-level="4"] {
    background: var(--color-text);
}

.calendar-day:not(.empty):hover {
    outline: 2px solid var(--color-text);
    outline-offset: 1px;
}

.calendar-tooltip {
    position: fixed;
    background: var(--color-text);
    color: var(--color-bg);
    padding: 0.5rem 0.75rem;
    border-radius: 4px;
    font-size: 0.75rem;
    pointer-events: none;
    z-index: 1000;
    white-space: nowrap;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.calendar-tooltip.visible {
    opacity: 1;
}

.calendar-legend {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 1rem;
    font-size: 0.75rem;
    color: var(--color-text-secondary);
}

.calendar-legend-label {
    margin-right: 0.25rem;
}

.calendar-legend-items {
    display: flex;
    gap: 2px;
}

.calendar-legend-item {
    width: 12px;
    height: 12px;
    border-radius: 2px;
}

.activity-loading {
    text-align: center;
    padding: 2rem;
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
}

.activity-error {
    text-align: center;
    padding: 2rem;
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
}

.calendar-stats {
    display: flex;
    gap: 1.5rem;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--color-border);
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
}

.calendar-stat strong {
    color: var(--color-text);
    font-weight: 600;
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.25rem;
}

.portfolio-item {
    border: 1px solid var(--color-border);
    padding: 1.5rem;
    border-radius: var(--radius);
    transition: var(--transition);
}

.portfolio-item:hover {
    border-color: var(--color-text);
}

.portfolio-item:last-child:nth-child(odd) {
    grid-column: span 2;
}

.portfolio-item h3 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.portfolio-item p {
    margin-bottom: 1.25rem;
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
}

.portfolio-item a {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    font-size: 0.9375rem;
    color: var(--color-text);
    text-decoration: none;
    font-weight: 500;
}

.portfolio-item a:hover {
    color: var(--color-accent);
}

.portfolio-item a .icon {
    width: 0.9375rem;
    height: 0.9375rem;
    stroke: currentColor;
    fill: none;
}

.portfolio-item a[href*="github.com"] .icon path {
    fill: currentColor;
    stroke: none;
}

.contact-text {
    font-size: 1.0625rem;
    margin-bottom: 1.5rem;
    color: var(--color-text-secondary);
}

.contact-email {
    display: inline-block;
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--color-text);
    text-decoration: none;
    border-bottom: 2px solid var(--color-text);
    padding-bottom: 0.125rem;
    transition: var(--transition);
}

.contact-email:hover {
    opacity: 0.6;
}

.footer-container {
    text-align: center;
    padding: 2.5rem var(--spacing);
    border-top: 1px solid var(--color-border);
    margin-top: 3rem;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    align-items: center;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.footer-container a {
    text-decoration: underline;
    color: var(--color-text-secondary)
}

.footer-container a:hover {
    text-decoration: none;
    color: var(--color-text)
}

.footer-container .links-container {
    display: flex;
    flex-direction: row;
    gap: 20px;
    align-items: center;
}

.scroll-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--color-text);
    color: var(--color-bg);
    border: none;
    border-radius: 50%;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.scroll-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.scroll-to-top:hover {
    transform: translateY(-2px);
}

.scroll-to-top .icon {
    width: 1.125rem;
    height: 1.125rem;
    stroke: var(--color-bg);
    fill: none;
    transition-duration: .2s;
}

.scroll-to-top:hover .icon {
    width: 1.45rem;
    height: 1.45rem;
}

.list-item {
    margin-bottom: 1rem;
    color: var(--color-text);
    display: block;
    font-size: 1rem;
}

.list-item strong {
    display: block;
    font-size: 1.125rem;
    margin-bottom: 0.25rem;
}

.list-item span {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    display: block;
}

.list-item a {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    font-size: 0.9375rem;
    color: var(--color-text);
    text-decoration: none;
    font-weight: 500;
    margin-top: 0.5rem;
}

.list-item a:hover {
    color: var(--color-accent);
}

.list-item a .icon {
    width: 0.9375rem;
    height: 0.9375rem;
    stroke: currentColor;
    fill: none;
}

.highlight {
    color: var(--color-accent);
    font-weight: 500;
}

.status-text {
    transition: opacity 0.3s ease;
}

/*
#toast-container {
position: fixed;
top: 2rem;
right: 1.5rem;
display: flex;
flex-direction: column;
gap: 0.75rem;
z-index: 1000;
}

.toast {
background: var(--color-text);
color: var(--color-bg);
padding: 0.75rem 1rem;
border-radius: var(--radius);
box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
font-size: 0.875rem;
opacity: 0;
transform: translateY(-20px);
transition: opacity 0.3s ease, transform 0.3s ease;
}

.toast.show {
opacity: 1;
transform: translateY(0);
}
*/

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .menu-toggle {
        display: flex;
    }

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

    .portfolio-item:last-child:nth-child(odd) {
        grid-column: span 1;
    }

    .scroll-to-top {
        bottom: 1.5rem;
        right: 1.5rem;
    }

    .activity-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }

    .contribution-calendar {
        padding: 1rem;
        overflow-x: auto;
    }

    .calendar-stats {
        flex-direction: column;
        gap: 0.5rem;
    }

    .calendar-grid-container {
        min-width: max-content;
    }
}