:root {
    --bg: #f7f8fa;
    --surface: #ffffff;
    --nav-bg: rgba(255, 255, 255, .95);
    --ink: #1c2430;
    --ink-soft: #55606e;
    --accent: #1f5f8b;
    --accent-soft: #e8f0f7;
    --line: #e2e6ec;
    --shadow: rgba(28, 36, 48, .12);
    --radius: 10px;
}

[data-theme="dark"] {
    --bg: #12161c;
    --surface: #1a2029;
    --nav-bg: rgba(26, 32, 41, .95);
    --ink: #e7ecf2;
    --ink-soft: #a3aebc;
    --accent: #6cb6e8;
    --accent-soft: #23303d;
    --line: #2b3542;
    --shadow: rgba(0, 0, 0, .45);
}

html {
    color-scheme: light;
}

[data-theme="dark"] {
    color-scheme: dark;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

html[lang="ko"] body {
    word-break: keep-all;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--ink);
    font-family: "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, Helvetica, Arial, sans-serif;
    font-size: 16px;
    line-height: 1.65;
    transition: background-color .2s ease, color .2s ease;
}

.container {
    width: min(960px, 100% - 3rem);
    margin: 0 auto;
}

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

a:hover {
    text-decoration: underline;
}

svg {
    width: 1.05em;
    height: 1.05em;
    fill: currentColor;
    flex-shrink: 0;
}

/* Hero */
.hero {
    background: var(--surface);
    border-bottom: 1px solid var(--line);
    padding: 3rem 0 2.5rem;
}

.hero-inner {
    display: flex;
    gap: 2rem;
    align-items: center;
    flex-wrap: wrap;
}

.headshot {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    object-fit: cover;
    background: var(--accent-soft);
    border: 3px solid var(--surface);
    box-shadow: 0 2px 12px var(--shadow);
}

.hero-text h1 {
    margin: 0;
    font-size: 2.25rem;
    letter-spacing: -.02em;
}

.tagline {
    margin: .25rem 0 1rem;
    color: var(--ink-soft);
    font-size: 1.05rem;
}

.contact-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    gap: .4rem 1.5rem;
    font-size: .92rem;
}

.contact-list li {
    display: flex;
    align-items: center;
    gap: .45rem;
    color: var(--ink-soft);
}

/* Nav */
.nav {
    position: sticky;
    top: 0;
    z-index: 10;
    background: var(--nav-bg);
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(6px);
}

.nav .container {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    padding: .75rem 0;
    font-size: .9rem;
    font-weight: 600;
}

.nav a {
    color: var(--ink-soft);
}

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

.nav-controls {
    margin-left: auto;
    display: flex;
    gap: .5rem;
}

.pill-button {
    display: inline-flex;
    align-items: center;
    gap: .4rem;
    padding: .3rem .8rem;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: var(--surface);
    color: var(--ink-soft);
    font: inherit;
    font-size: .82rem;
    cursor: pointer;
}

.pill-button:hover {
    color: var(--accent);
    border-color: var(--accent);
}

.pill-button .icon-sun,
[data-theme="dark"] .pill-button .icon-moon {
    display: none;
}

[data-theme="dark"] .pill-button .icon-sun {
    display: block;
}

/* Sections */
main {
    padding: 1rem 0 3rem;
}

section {
    padding: 2.5rem 0 .5rem;
}

h2 {
    font-size: 1.4rem;
    margin: 0 0 1.25rem;
    padding-bottom: .5rem;
    border-bottom: 2px solid var(--accent-soft);
    letter-spacing: -.01em;
}

h3 {
    font-size: 1.05rem;
    margin: 0;
}

p {
    margin: 0 0 1rem;
    color: var(--ink-soft);
}

.subtitle {
    margin: .15rem 0 .75rem;
    font-size: .95rem;
    color: var(--ink-soft);
}

.subhead {
    margin: 2rem 0 .75rem;
    font-size: 1rem;
}

/* Entries */
.entry {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 1.25rem 1.5rem;
    margin-bottom: 1.25rem;
}

.entry-header {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: baseline;
    gap: .25rem 1rem;
    margin-bottom: .4rem;
}

.meta {
    font-size: .85rem;
    color: var(--ink-soft);
    min-width: 0;
    overflow-wrap: break-word;
}

.bullets {
    margin: .5rem 0 0;
    padding-left: 1.15rem;
    color: var(--ink-soft);
}

.bullets li {
    margin-bottom: .4rem;
}

#education .bullets {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 1.25rem 1.5rem 1.25rem 2.5rem;
}

/* Expandable roles */
.company .subtitle {
    margin-bottom: 1.25rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--line);
}

.role {
    border-top: 1px solid var(--line);
}

.role:first-of-type {
    border-top: 0;
}

.role summary {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: baseline;
    gap: .25rem 1rem;
    padding: .85rem 0 .85rem 1.5rem;
    position: relative;
    cursor: pointer;
    list-style: none;
}

.role summary::-webkit-details-marker {
    display: none;
}

.role summary::before {
    content: "";
    position: absolute;
    left: .25rem;
    top: 1.35rem;
    width: .5rem;
    height: .5rem;
    border-right: 2px solid var(--accent);
    border-bottom: 2px solid var(--accent);
    transform: rotate(-45deg);
    transition: transform .2s ease;
}

.role[open] summary::before {
    transform: rotate(45deg);
}

.role summary:hover .role-title {
    color: var(--accent);
}

.role-title {
    font-weight: 700;
    font-size: 1.02rem;
}

.role .bullets {
    margin: 0 0 1.25rem;
    padding-left: 2.6rem;
}

/* Tags */
.tags {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: .4rem;
    margin: 0;
    padding: 0;
}

.tags li {
    background: var(--accent-soft);
    color: var(--accent);
    border-radius: 999px;
    padding: .15rem .7rem;
    font-size: .8rem;
    font-weight: 600;
}

.skill-groups {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1rem;
}

.skill-group {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 1.1rem 1.25rem;
}

.skill-group h3 {
    font-size: .85rem;
    text-transform: uppercase;
    letter-spacing: .06em;
    color: var(--ink-soft);
    margin-bottom: .75rem;
}

/* Projects */
.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1rem;
}

.card {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 1.25rem 1.5rem;
    display: flex;
    flex-direction: column;
}

.card .tags {
    margin-top: auto;
}

.card-wide {
    margin-bottom: 1rem;
    border-left: 4px solid var(--accent);
}

.links {
    margin: 1rem 0 0;
}

.links a {
    display: inline-flex;
    align-items: center;
    gap: .4rem;
    font-weight: 600;
    font-size: .9rem;
}

/* Footer */
.footer {
    background: var(--surface);
    border-top: 1px solid var(--line);
    padding: 1.5rem 0;
    font-size: .88rem;
}

.footer .container {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: .5rem 1rem;
}

.footer p {
    margin: 0;
}

.footer-links {
    display: flex;
    gap: 1.25rem;
}

@media (max-width: 600px) {
    .hero {
        padding: 2rem 0;
    }

    .hero-inner {
        gap: 1.25rem;
    }

    .headshot {
        width: 110px;
        height: 110px;
    }

    .hero-text h1 {
        font-size: 1.75rem;
    }

    .nav .container {
        gap: 1rem;
        font-size: .82rem;
    }
}

@media print {
    .nav {
        display: none;
    }

    html {
        --bg: #fff;
        --surface: #fff;
        --ink: #000;
        --ink-soft: #333;
        --accent: #1f5f8b;
        --accent-soft: #eee;
        --line: #ccc;
    }

    body {
        background: #fff;
    }
}