/* ===========================
   SHARED STYLES — thejameskang.com
   =========================== */

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

/* Design tokens */
:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --text-tertiary: #999999;
    --border-color: #e5e5e5;
    --sidebar-width: 280px;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #0f172a;
        --bg-secondary: #1e293b;
        --text-primary: #e2e8f0;
        --text-secondary: #94a3b8;
        --text-tertiary: #64748b;
        --border-color: #334155;
    }
}

/* Base */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    animation: pageFadeIn 0.15s ease-out;
}

@keyframes pageFadeIn {
    from { opacity: 0; transform: translateY(5px); }
    to   { opacity: 1; transform: translateY(0); }
}

@media (prefers-reduced-motion: reduce) {
    body { animation: none; }
}

/* Layout */
.container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
aside {
    width: var(--sidebar-width);
    border-right: 1px solid var(--border-color);
    padding: 3rem 2rem;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    background: var(--bg-primary);
    z-index: 10;
    display: flex;
    flex-direction: column;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    text-decoration: none;
}

/* Hamburger button — hidden on desktop */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px;
    border-radius: 4px;
    -webkit-tap-highlight-color: transparent;
}

.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all 0.2s;
}

/* Nav body — holds nav links + social */
.nav-body {
    display: flex;
    flex-direction: column;
    flex: 1;
}

nav {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

nav a {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 0.75rem 1rem;
    border-radius: 6px;
    transition: all 0.2s;
    font-size: 0.95rem;
}

nav a:hover,
nav a.active {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

nav a:focus-visible {
    outline: 2px solid var(--text-primary);
    outline-offset: 2px;
}

/* Social links */
.social {
    margin-top: auto;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.social a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s;
}

.social a:hover {
    color: var(--text-primary);
}

/* Main content */
main {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: 5rem 4rem;
    max-width: 900px;
    min-width: 0;
}

/* Mobile: ≤ 768px */
@media (max-width: 768px) {
    .container {
        flex-direction: column;
    }

    aside {
        position: sticky;
        top: 0;
        width: 100%;
        height: auto;
        overflow: visible;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        padding: 1.25rem 1.5rem;
    }

    .nav-header {
        margin-bottom: 0;
    }

    .logo {
        font-size: 1.25rem;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-body {
        display: none;
        padding-top: 1.25rem;
    }

    .nav-body.open {
        display: flex;
        flex-direction: column;
    }

    nav {
        flex-direction: row;
        flex-wrap: wrap;
        gap: 0.25rem;
    }

    nav a {
        padding: 0.5rem 0.75rem;
        font-size: 0.9rem;
    }

    .social {
        flex-direction: row;
        flex-wrap: wrap;
        gap: 1rem;
        margin-top: 0.5rem;
        padding-top: 0.75rem;
    }

    main {
        margin-left: 0;
        padding: 2.5rem 1.5rem;
        max-width: 100%;
    }
}

@media (max-width: 480px) {
    main {
        padding: 2rem 1rem;
    }
}