/* ===================================
   Personal Website — Styles
   =================================== */
@import url('variables.css');
@import url('https://fonts.googleapis.com/css2?family=Source+Sans+3:ital,wght@0,300;0,400;0,600;0,700;1,400&display=swap');

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-height);
}

body {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
}

/* ── Utility ── */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* ── Links ── */
a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary-muted);
}

/* ===================================
   Navbar
   =================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: var(--color-bg-nav);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    transition: box-shadow var(--transition-base);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-lg);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    font-weight: 700;
    font-size: 1.15rem;
    color: var(--color-primary-dark);
    letter-spacing: -0.02em;
}

.nav-brand:hover {
    color: var(--color-primary);
}

.nav-menu {
    list-style: none;
    display: flex;
    gap: var(--space-sm);
}

.nav-link {
    display: block;
    padding: var(--space-xs) var(--space-sm);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-light);
    border-radius: 6px;
    transition: color var(--transition-fast), background var(--transition-fast);
}

.nav-link:hover {
    color: var(--color-primary);
    background: var(--color-hover-bg);
}

.nav-link.active {
    color: var(--color-primary);
    background: var(--color-active-bg);
}

/* Hamburger */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-sm);
}

.hamburger,
.hamburger::before,
.hamburger::after {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: transform var(--transition-base);
    position: relative;
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    left: 0;
}

.hamburger::before {
    top: -7px;
}

.hamburger::after {
    top: 7px;
}

/* ===================================
   Sections (general)
   =================================== */
section {
    padding: var(--space-xl) 0;
}

section+section {
    border-top: 1px solid var(--color-border);
}

section:nth-child(even) {
    background: var(--color-bg-alt);
}

.section-title {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--color-primary-dark);
    margin-bottom: var(--space-lg);
    position: relative;
    padding-bottom: var(--space-sm);
}

.section-title::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 50px;
    height: 4px;
    background: var(--color-primary);
    border-radius: 2px;
}

.subsection-title {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--color-primary-dark);
    margin-top: var(--space-xl);
    margin-bottom: var(--space-md);
}

/* ===================================
   Hero / About
   =================================== */
.hero {
    padding-top: calc(var(--nav-height) + var(--space-2xl));
    padding-bottom: var(--space-2xl);
}

.hero-inner {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
}


.hero-photo {
    flex-shrink: 0;
    width: 160px;
    height: 160px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--color-primary-light);
}

.hero-text h1 {
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--color-primary-dark);
    line-height: 1.2;
}

.hero-text .subtitle {
    font-size: 1.1rem;
    color: var(--color-primary-muted);
    margin-top: var(--space-xs);
    font-weight: 500;
}

.hero-text .bio {
    margin-top: var(--space-md);
    color: var(--color-text-light);
    max-width: 540px;
}

.hero-text .bio p+p {
    margin-top: var(--space-sm);
}

/* ===================================
   Simple Tables (Education, Experience)
   =================================== */
.simple-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}

.simple-table th {
    text-align: left;
    font-weight: 600;
    color: var(--color-primary-dark);
    padding: var(--space-xs) var(--space-md);
    border-bottom: 2px solid var(--color-primary-light);
}

.simple-table td {
    padding: var(--space-xs) var(--space-md);
    border-bottom: 1px solid var(--color-accent);
    color: var(--color-text-light);
}

.simple-table tr:last-child td {
    border-bottom: none;
}


/* ===================================
   Detail Lists (Teaching, Activities)
   =================================== */
.detail-list {
    list-style: none;
    display: grid;
    gap: var(--space-sm);
}

.detail-item {
    padding: var(--space-sm) var(--space-md);
    background: var(--color-bg-card);
    border-radius: 6px;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: baseline;
    gap: var(--space-xs) var(--space-md);
    box-shadow: 0 2px 5px var(--color-shadow-light);
}

.detail-item .detail-title {
    font-weight: 600;
    color: var(--color-primary-dark);
}

.detail-item .detail-subtitle {
    font-size: 0.9rem;
    color: var(--color-primary-muted);
}

.detail-item .detail-period {
    font-size: 0.85rem;
    color: var(--color-text-light);
    white-space: nowrap;
}

.detail-item .detail-description {
    width: 100%;
    font-size: 0.88rem;
    color: var(--color-text-light);
    margin: 0;
}

.detail-list+.info-block {
    margin-top: var(--space-lg);
}

/* ===================================
   Shared Components
   =================================== */
.info-block {
    margin-bottom: var(--space-lg);
}

.info-block p {
    font-size: 0.95rem;
    color: var(--color-text-light);
    line-height: 2;
}

.info-block .label {
    font-weight: 600;
    color: var(--color-primary-dark);
    margin-right: var(--space-sm);
}

.entry-list {
    list-style: none;
    display: grid;
    gap: var(--space-md);
}

.entry-item {
    padding: var(--space-sm) var(--space-md);
    background: var(--color-bg-card);
    border-radius: 8px;
    box-shadow: 0 2px 6px var(--color-shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-md);
}

.entry-content {
    flex: 1;
    min-width: 0;
}

.entry-item .entry-title {
    font-weight: 600;
    color: var(--color-primary-dark);
    font-size: 1.02rem;
}

.entry-item .entry-detail {
    font-size: 0.92rem;
    color: var(--color-text-light);
    margin-top: var(--space-xs);
}

.entry-item .entry-meta {
    font-size: 0.85rem;
    color: var(--color-primary-muted);
    margin-top: var(--space-xs);
}

.entry-links {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.entry-link {
    font-size: 0.82rem;
    padding: 2px 8px;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    color: var(--color-text-light);
    text-decoration: none;
    white-space: nowrap;
    transition: all var(--transition-fast);
}

.entry-link:hover {
    color: var(--color-primary);
    border-color: var(--color-primary-light);
}

/* ===================================
   Contact
   =================================== */
.contact-row {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--space-xl);
}

.contact-row .info-block {
    margin-bottom: 0;
}

.contact-links {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.contact-card {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-xs);
    padding: var(--space-xs) var(--space-sm);
    background: var(--color-bg-card);
    border-radius: 8px;
    border: 1px solid var(--color-border);
    font-size: 0.95rem;
    color: var(--color-text-light);
    text-decoration: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

a.contact-card:hover {
    color: var(--color-text-light);
    border-color: var(--color-primary-light);
}

a.contact-card:focus-visible {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 2px var(--color-hover-bg);
}

.contact-card .label {
    font-weight: 600;
    color: var(--color-primary-dark);
}

.contact-card .value {
    color: var(--color-text-light);
    overflow-wrap: anywhere;
}

/* ===================================
   Footer
   =================================== */
.site-footer {
    padding: var(--space-lg) 0;
    text-align: center;
    font-size: 0.85rem;
    color: var(--color-text-light);
    border-top: 1px solid var(--color-border);
}

/* ===================================
   Responsive
   =================================== */
@media (max-width: 768px) {
    .hero-inner {
        flex-direction: column;
        text-align: center;
        gap: var(--space-lg);
    }

    .hero-text .bio {
        max-width: 100%;
    }

    .hero-links {
        justify-content: center;
    }

    .section-title::after {
        left: 50%;
        transform: translateX(-50%);
    }

    /* Mobile nav */
    .nav-toggle {
        display: block;
    }

    .nav-menu {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background: var(--color-bg-nav-mobile);
        backdrop-filter: blur(10px);
        flex-direction: column;
        padding: var(--space-md) var(--space-lg);
        border-bottom: 1px solid var(--color-border);
        transform: translateY(-120%);
        opacity: 0;
        transition: transform var(--transition-base), opacity var(--transition-base);
        pointer-events: none;
    }

    .nav-menu.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
    }

    .nav-link {
        padding: var(--space-sm) var(--space-md);
        font-size: 1rem;
    }


    /* Detail list */
    .detail-item {
        flex-direction: column;
        gap: var(--space-xs);
    }

    /* Contact stacking */
    .contact-row {
        flex-direction: column;
        gap: var(--space-lg);
    }
}

@media (max-width: 480px) {
    .hero-text h1 {
        font-size: 1.7rem;
    }

    .hero-photo {
        width: 120px;
        height: 120px;
    }

    .section-title {
        font-size: 1.35rem;
    }

    .container {
        padding: 0 var(--space-md);
    }
}