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

html {
    scroll-padding-top: calc(var(--nav-height) + 1rem);
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.7;
    color: var(--text);
    background: var(--bg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background 0.2s, color 0.2s;
}

/* --- Navigation --- */

.site-header {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 100;
    background: var(--nav-bg);
    border-bottom: 1px solid var(--border);
    transition: background 0.2s;
}

nav {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 0.75rem;
    height: var(--nav-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.site-title {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--text);
    text-decoration: none;
    white-space: nowrap;
    margin-right: auto;
}

.nav-links {
    list-style: none;
    display: flex;
    align-items: center;
    gap: 0.25rem;
    justify-content: flex-end;
    padding: 0;
    margin: 0;
}

.nav-links li {
    margin: 0;
}

.nav-links a {
    color: var(--text);
    text-decoration: none;
    padding: 0.4rem 0.75rem;
    border-radius: 6px;
    font-size: 1.1rem;
    font-weight: 600;
    transition: color 0.15s, background 0.15s;
}

.nav-links a:hover {
    color: var(--accent);
    background: var(--card-bg);
}

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

#theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 0.4rem;
    border-radius: 6px;
    display: flex;
    align-items: center;
    transition: color 0.15s;
}

#theme-toggle:hover {
    color: var(--accent);
}

.dark .icon-moon { display: none; }
.icon-sun { display: none; }
.dark .icon-sun { display: block; }
.icon-moon { display: block; }

/* --- Main Content --- */

main {
    max-width: var(--max-width);
    width: 100%;
    margin: 0 auto;
    padding: calc(var(--nav-height) + 2rem) 0.75rem 3rem;
    flex: 1;
}

main > :first-child {
    margin-top: 0;
}

/* --- Typography --- */

h1, h2, h3, h4, h5, h6 {
    line-height: 1.3;
    margin-top: 1.8rem;
    margin-bottom: 0.6rem;
    font-weight: 600;
}

h1 { font-size: 1.8rem; }
h2 { font-size: 1.4rem; }
h3 { font-size: 1.2rem; }

p { margin-bottom: 1rem; }

a {
    color: var(--accent);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

img {
    max-width: 100%;
    height: auto;
}

blockquote {
    border-left: 3px solid var(--accent);
    padding-left: 1rem;
    margin: 1rem 0;
    color: var(--text-secondary);
}

hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 2rem 0;
}

/* --- Lists --- */

ul, ol {
    padding-left: 1.5rem;
    margin-bottom: 1rem;
}

li {
    margin-bottom: 0.3rem;
}

li > ul, li > ol {
    margin-bottom: 0;
}

/* --- Tables --- */

table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
}

th, td {
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border);
    text-align: left;
}

th {
    background: var(--card-bg);
    font-weight: 600;
}

/* --- Code --- */

code {
    font-family: var(--font-mono);
    font-size: 0.875em;
    background: var(--code-bg);
    padding: 0.15em 0.35em;
    border-radius: 4px;
}

pre {
    margin: 1rem 0;
    border-radius: 8px;
    padding: 1rem;
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.5;
}

pre code {
    background: none;
    padding: 0;
    font-size: inherit;
}

/* --- Article --- */

.page-header {
    margin-bottom: 2rem;
}

.page-header h1 {
    margin-top: 0;
    margin-bottom: 0.3rem;
}

.page-header time {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.page-header .description {
    color: var(--text-secondary);
    margin-top: 0.5rem;
    font-size: 0.95rem;
}

/* --- Page Lists (section index, homepage) --- */

.page-list {
    list-style: none;
    padding: 0;
}

.page-list li {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border);
}

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

.page-list a {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 1rem;
    text-decoration: none;
}

.page-list-title {
    color: var(--text);
    font-weight: 500;
}

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

.page-list time {
    color: var(--text-secondary);
    font-size: 0.85rem;
    white-space: nowrap;
}

.page-list-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin: 0.25rem 0 0;
}

/* --- Profile (homepage) --- */

.profile {
    text-align: center;
    padding: 2rem 0 3rem;
}

.profile-img {
    border-radius: 50%;
    margin-bottom: 1rem;
}

.profile h1 {
    margin-top: 0;
}

.profile-subtitle {
    color: var(--text-secondary);
    font-size: 1.05rem;
}

.social-links {
    margin-top: 1rem;
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.social-links a {
    color: var(--text-secondary);
    padding: 0.4rem 0.8rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.9rem;
    transition: color 0.15s, border-color 0.15s;
}

.social-links a:hover {
    color: var(--accent);
    border-color: var(--accent);
    text-decoration: none;
}

/* --- Home Sections --- */

.home-section {
    margin-top: 2rem;
}

.home-section h2 a {
    color: var(--text);
}

.home-section h2 a:hover {
    color: var(--accent);
}

/* --- Resume --- */

.resume-page iframe {
    width: 100%;
    height: 85vh;
    border: none;
    border-radius: 4px;
}

.resume-fallback {
    text-align: center;
    margin-top: 0.5rem;
    font-size: 0.85rem;
}

/* --- 404 --- */

.not-found {
    text-align: center;
    padding: 3rem 0;
}

.not-found h1 {
    font-size: 4rem;
    margin-bottom: 0.5rem;
}

.not-found-img {
    margin-top: 2rem;
    max-width: 400px;
}

.go-home {
    display: inline-block;
    margin-top: 1rem;
    padding: 0.5rem 1.5rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-weight: 600;
}

/* --- Footer --- */

footer {
    text-align: center;
    padding: 0.5rem 0.75rem;
    color: var(--text-secondary);
    font-size: 0.85rem;
    border-top: 1px solid var(--border);
    margin-top: auto;
}

.footer-links {
    margin-top: 0.15rem;
}

.footer-links a {
    color: var(--text-secondary);
    margin: 0 0.5rem;
}

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

/* --- Hamburger (hidden on desktop) --- */

.hamburger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.4rem;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
}

.hamburger span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text);
    border-radius: 1px;
    transition: transform 0.2s, opacity 0.2s;
}

.hamburger.open span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.hamburger.open span:nth-child(2) {
    opacity: 0;
}

.hamburger.open span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* --- Responsive --- */

@media (max-width: 600px) {
    .hamburger {
        display: flex;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background: var(--nav-bg);
        border-bottom: 1px solid var(--border);
        flex-direction: column;
        padding: 0.5rem 0;
    }

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

    .nav-links li {
        text-align: center;
    }

    .nav-links a {
        display: block;
        padding: 0.75rem 1rem;
        font-size: 1rem;
    }

    main {
        padding-left: 0.5rem;
        padding-right: 0.5rem;
    }

    h1 { font-size: 1.5rem; }

    .page-list a {
        flex-direction: column;
        gap: 0.2rem;
    }

    .not-found h1 {
        font-size: 3rem;
    }

    .resume-page iframe {
        display: none;
    }

    .resume-fallback {
        font-size: 1rem;
        margin-top: 2rem;
    }
}