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

:root {
    --color-bg: #fafafa;
    --color-surface: #ffffff;
    --color-text: #1a1a2e;
    --color-text-secondary: #555;
    --color-accent: #2563eb;
    --color-accent-hover: #1d4ed8;
    --color-border: #e5e7eb;
    --radius: 8px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
}

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

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

/* Nav */
nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    z-index: 100;
}

.nav-inner {
    max-width: 720px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 56px;
}

.nav-avatar {
    display: flex;
    align-items: center;
}

.nav-avatar img {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    object-fit: cover;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 24px;
}

.nav-links a {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
}

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

/* Main */
main {
    max-width: 720px;
    margin: 0 auto;
    padding: 80px 24px 40px;
}

section {
    margin-bottom: 64px;
}

section:last-of-type {
    margin-bottom: 0;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    line-height: 1.2;
}

h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 24px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--color-accent);
    display: inline-block;
}

h3 {
    font-size: 1.125rem;
    font-weight: 600;
}

p {
    color: var(--color-text-secondary);
}

ul {
    padding-left: 20px;
    color: var(--color-text-secondary);
}

li {
    margin-bottom: 6px;
}

li:last-child {
    margin-bottom: 0;
}

/* Hero */
#hero {
    padding: 48px 0;
}

#hero .aka {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    margin-top: 2px;
}

#hero .subtitle {
    font-size: 1.125rem;
    color: var(--color-accent);
    font-weight: 500;
    margin-top: 8px;
}

#hero .tagline {
    margin-top: 12px;
    font-size: 1.1rem;
    max-width: 480px;
}

.btn {
    display: inline-block;
    margin-top: 24px;
    padding: 10px 24px;
    background: var(--color-accent);
    color: #fff;
    border-radius: var(--radius);
    font-weight: 500;
    font-size: 0.9rem;
}

.btn:hover {
    background: var(--color-accent-hover);
    color: #fff;
}

/* Card */
.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 20px;
}

.card:last-child {
    margin-bottom: 0;
}

.card-head {
    margin-bottom: 8px;
}

.card-head h3 {
    display: inline;
}

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

.role {
    display: block;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-top: 2px;
}

.tech {
    font-size: 0.85rem;
    color: var(--color-accent);
    font-weight: 500;
    margin-bottom: 10px;
}

.card ul {
    margin-top: 8px;
}

/* Contact */
.contact-links {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.contact-links a {
    font-weight: 500;
    padding: 8px 0;
}

/* Footer */
footer {
    text-align: center;
    padding: 24px;
    border-top: 1px solid var(--color-border);
    margin-top: 40px;
}

footer p {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
}

/* Responsive */
@media (max-width: 600px) {
    main {
        padding: 72px 16px 32px;
    }

    .nav-inner {
        padding: 0 16px;
    }

    h1 {
        font-size: 1.75rem;
    }

    #hero {
        padding: 32px 0;
    }

    .card {
        padding: 16px;
    }
}