/* ── Light mode (default) ─────────────────── */
:root {
    --bg: #fafafa;
    --surface: #ffffff;
    --text: #1a1a1a;
    --text-secondary: #555555;
    --border: #e5e5e5;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.06);
    --badge-bg: #ffffff;
    --switch-bg: #d1d1d1;
    --switch-thumb: #ffffff;
    --switch-active-bg: #2b2b2b;
    --neumo-light: rgba(255,255,255,0.8);
    --neumo-dark: rgba(0,0,0,0.08);
    --card-hover-bg: #f5f5f5;
    --card-active-bg: #eaeaea;
}

[data-theme="dark"] {
    --bg: #0f0f0f;
    --surface: #1c1c1c;
    --text: #ececec;
    --text-secondary: #a0a0a0;
    --border: #2e2e2e;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
    --badge-bg: #2a2a2a;
    --switch-bg: #3a3a3a;
    --switch-thumb: #0f0f0f;
    --switch-active-bg: #5a5a5a;
    --neumo-light: rgba(255,255,255,0.05);
    --neumo-dark: rgba(0,0,0,0.4);
    --card-hover-bg: #222222;
    --card-active-bg: #181818;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
    font-family: 'Inter', 'SF Pro Display', 'Segoe UI', system-ui, -apple-system, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    transition: background-color 0.3s, color 0.3s;
}

header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(250,250,250,0.82);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border);
    transition: background 0.3s, border-color 0.3s;
}
[data-theme="dark"] header { background: rgba(15,15,15,0.82); }

.header-inner {
    max-width: 780px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    height: 56px;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 28px;
    align-items: center;
}
nav a {
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.2s;
    position: relative;
}
nav a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1.5px;
    background: var(--text);
    transition: width 0.2s;
}
nav a:hover, nav a.active { color: var(--text); }
nav a:hover::after, nav a.active::after { width: 100%; }

/* ── Theme switch (toggle slider) ─────────── */
.switch-wrapper {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-left: 8px;
}
.switch-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    position: relative;
    width: 48px;
    height: 26px;
    background: var(--switch-bg);
    border-radius: 30px;
    transition: background 0.3s;
    border: 1px solid var(--border);
}
.switch-label input {
    opacity: 0;
    width: 0;
    height: 0;
    position: absolute;
}
.slider {
    position: absolute;
    top: 2px;
    left: 2px;
    width: 20px;
    height: 20px;
    background: var(--switch-thumb);
    border-radius: 50%;
    transition: transform 0.25s ease, background 0.3s;
    box-shadow: 0 1px 3px rgba(0,0,0,0.15);
}
input:checked + .slider {
    transform: translateX(22px);
}
.switch-icon {
    font-size: 0.8rem;
    color: var(--text-secondary);
    transition: color 0.3s;
    user-select: none;
}
.switch-icon.sun { margin-right: 2px; }
.switch-icon.moon { margin-left: 2px; }

/* Mobile menu toggle */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px;
    flex-direction: column;
    gap: 5px;
    z-index: 101;
}
.menu-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: 0.2s;
}

main { max-width: 780px; margin: 0 auto; padding: 0 24px; }

.hero {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 64px 0 48px;
}
.avatar-wrapper {
    width: 116px; height: 116px;
    margin-bottom: 24px;
    border-radius: 50%;
    border: 3px solid #00e47c;
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}
.hero-avatar {
    width: 100%; height: 100%;
    border-radius: 50%;
    object-fit: cover;
    display: block;
    background: #e8e8e8;
    transition: transform 0.2s;
}
.hero-avatar:hover { transform: scale(1.04); }
.hero h1 { font-size: 2rem; font-weight: 700; margin-bottom: 6px; }
.hero .tagline { color: var(--text-secondary); margin-bottom: 16px; max-width: 460px; }
.badge-row { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.badge {
    display: inline-block;
    background: var(--badge-bg);
    border: 1px solid var(--border);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.78rem;
    font-family: 'SF Mono', monospace;
    color: var(--text-secondary);
    transition: 0.2s;
}

.social-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    margin-top: 20px;
}
.social-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 14px;
    border: none;
    border-radius: 10px;
    background: var(--surface);
    color: var(--text-secondary);
    font-size: 0.82rem;
    font-weight: 500;
    text-decoration: none;
    box-shadow:
        -8px -8px 20px var(--neumo-light),
        10px 10px 24px var(--neumo-dark);
    transition: box-shadow 0.25s ease, transform 0.2s ease, background 0.2s ease, color 0.2s ease;
}
.social-btn:hover {
    background: var(--card-hover-bg);
    color: var(--text);
    box-shadow:
        -12px -12px 30px var(--neumo-light),
        14px 14px 36px var(--neumo-dark);
    transform: translateY(-2px);
}
.social-btn:active {
    background: var(--card-active-bg);
    color: var(--text);
    box-shadow:
        inset -4px -4px 10px var(--neumo-light),
        inset 5px 5px 12px var(--neumo-dark);
    transform: translateY(0);
}

section { padding: 56px 0; border-top: 1px solid var(--border); }
.section-label {
    font-family: 'SF Mono', monospace;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-secondary);
    margin-bottom: 20px;
}
h2 { font-size: 1.5rem; font-weight: 650; margin-bottom: 18px; }
p { color: var(--text-secondary); font-size: 0.95rem; margin-bottom: 16px; max-width: 600px; }

.card-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 12px;
}
.card {
    background: var(--surface);
    border: none;
    border-radius: 12px;
    padding: 20px 22px;
    box-shadow:
        -8px -8px 20px var(--neumo-light),
        10px 10px 24px var(--neumo-dark);
    transition: box-shadow 0.25s ease, transform 0.2s ease, background 0.2s ease;
    text-decoration: none;
    color: inherit;
    display: block;
    cursor: pointer;
}
.card:hover {
    background: var(--card-hover-bg);
    box-shadow:
        -12px -12px 30px var(--neumo-light),
        14px 14px 36px var(--neumo-dark);
    transform: translateY(-2px);
}
.card:active {
    background: var(--card-active-bg);
    box-shadow:
        inset -4px -4px 10px var(--neumo-light),
        inset 5px 5px 12px var(--neumo-dark);
    transform: translateY(0);
}
.card h3 { font-size: 1.05rem; font-weight: 600; margin-bottom: 6px; }
.card p { font-size: 0.85rem; margin-bottom: 10px; }
.tech-stack { font-family: 'SF Mono', monospace; font-size: 0.72rem; color: var(--text-secondary); }

.slide-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 12px;
}
.slide-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
    padding: 12px;
    border: none;
    border-radius: 12px;
    background: var(--surface);
    text-decoration: none;
    color: inherit;
    box-shadow:
        -8px -8px 20px var(--neumo-light),
        10px 10px 24px var(--neumo-dark);
    transition: box-shadow 0.25s ease, transform 0.2s ease, background 0.2s ease;
}
.slide-item:hover {
    background: var(--card-hover-bg);
    box-shadow:
        -12px -12px 30px var(--neumo-light),
        14px 14px 36px var(--neumo-dark);
    transform: translateX(3px);
}
.slide-item:active {
    background: var(--card-active-bg);
    box-shadow:
        inset -4px -4px 10px var(--neumo-light),
        inset 5px 5px 12px var(--neumo-dark);
    transform: translateX(0);
}
.slide-thumb {
    width: 160px;
    height: 90px;
    border-radius: 4px;
    object-fit: cover;
    flex-shrink: 0;
    background: #e8e8e8;
}
.slide-info h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 4px;
}
.slide-info p {
    font-size: 0.85rem;
    margin-bottom: 6px;
}
@media (max-width: 480px) {
    .slide-item {
        flex-direction: column;
    }
    .slide-thumb {
        width: 100%;
        height: auto;
        aspect-ratio: 16 / 9;
    }
}

.blog-list { list-style: none; }
.blog-list li { border-bottom: 1px solid var(--border); padding: 14px 0; }
.blog-list li:last-child { border-bottom: none; }
.blog-list a {
    text-decoration: none;
    color: var(--text);
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 8px;
    padding-left: 8px;
    border-left: 2px solid transparent;
    transition: border-color 0.25s ease, opacity 0.25s ease, transform 0.25s ease;
}
.blog-list a:hover {
    border-left-color: var(--text);
    transform: translateX(4px);
    opacity: 1;
}
.blog-list a:active {
    transform: translateX(1px);
}
.post-title { font-weight: 550; font-size: 0.95rem; }
.post-date { font-family: 'SF Mono', monospace; font-size: 0.75rem; color: #999; }

footer {
    text-align: center;
    padding: 40px 24px;
    border-top: 1px solid var(--border);
    margin-top: 24px;
}
footer p { font-size: 0.8rem; color: #999; margin: 0; }
footer .social-links { display: flex; gap: 20px; justify-content: center; margin-bottom: 10px; }
footer .social-links a { color: var(--text-secondary); text-decoration: none; font-size: 0.85rem; }
footer .social-links a:hover { color: var(--text); }

.overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.18); z-index: 99; }
.overlay.show { display: block; }

@media (max-width: 640px) {
    .card-grid { grid-template-columns: 1fr; }
    .hero { padding: 40px 0 32px; }
    .hero h1 { font-size: 1.6rem; }
    section { padding: 40px 0; }

    nav ul {
        position: fixed;
        top: 0; right: 0;
        height: 100vh;
        width: 220px;
        background: var(--surface);
        flex-direction: column;
        padding: 80px 28px 30px;
        gap: 22px;
        box-shadow: -4px 0 20px rgba(0,0,0,0.1);
        transform: translateX(100%);
        transition: transform 0.3s;
        z-index: 100;
    }
    nav ul.open { transform: translateX(0); }
    .menu-toggle { display: flex; }
}