@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@300;400&family=Syne:wght@300;400;600&display=swap');

:root {
    --border:    rgba(255,255,255,0.07);
    --border-hi: rgba(255,255,255,0.18);
    --text:      #e8e8ea;
    --muted:     #6e6e73;
    --dim:       #c8c8d0;
    --accent:    #a0c4ff;
    --glow:      rgba(160,196,255,0.08);
}

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

html, body {
    height: 100%;
    background: linear-gradient(to bottom right, #0a0a0d, #a8a8b0);
    background-attachment: fixed;
    color: var(--text);
    font-family: 'DM Sans', sans-serif;
    font-weight: 300;
    -webkit-font-smoothing: antialiased;
}

body { display: flex; flex-direction: column; min-height: 100vh; }

/* Header */
header {
    position: sticky; top: 0; z-index: 100;
    background: rgba(0,0,0,0.5);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
}

nav {
    display: flex; align-items: center;
    justify-content: space-between;
    padding: 0.75rem 2rem;
}

.menu { list-style: none; display: flex; gap: 1rem; margin: 0; padding: 0; }

.menu li a {
    font-size: 0.65rem; letter-spacing: 0.12em;
    text-transform: uppercase; color: var(--muted);
    text-decoration: none; transition: color 0.2s;
}
.menu li a:hover { color: var(--text); }

#language-menu {
    background: none; border: 1px solid var(--border);
    color: var(--muted); font-family: 'DM Sans', sans-serif;
    font-size: 0.65rem; letter-spacing: 0.12em;
    text-transform: uppercase; padding: 0.35rem 0.8rem;
    border-radius: 2rem; cursor: pointer;
    transition: border-color 0.2s, color 0.2s;
}
#language-menu:hover { border-color: var(--border-hi); color: var(--text); }

#language-list {
    position: absolute; top: 3rem; right: 2rem;
    background: rgba(10,10,12,0.95);
    border: 1px solid var(--border-hi);
    border-radius: 0.75rem; list-style: none;
    overflow: hidden; z-index: 200;
}
#language-list li {
    padding: 0.6rem 1.2rem; font-size: 0.7rem;
    letter-spacing: 0.08em; color: var(--muted);
    cursor: pointer; transition: background 0.15s, color 0.15s;
}
#language-list li:hover { background: rgba(255,255,255,0.05); color: var(--text); }
#language-list.hidden { display: none; }
.hidden { display: none; }

/* Main */
main {
    flex: 1; max-width: 780px; margin: 0 auto;
    padding: 4rem 2rem 6rem;
    animation: fadeUp 0.7s ease both;
}

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(20px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* Name – centered */
main > h1:first-of-type {
    font-family: 'Syne', sans-serif; font-weight: 600;
    font-size: clamp(1.4rem, 3vw, 1.9rem);
    letter-spacing: -0.01em; color: var(--text);
    text-align: center; margin-bottom: 0.3rem;
}

main > p:first-of-type {
    font-size: 0.75rem; letter-spacing: 0.14em;
    text-transform: uppercase; color: var(--muted);
    text-align: center; margin-bottom: 0;
}

.friend-container {
    display: flex; justify-content: center;
    margin: 2rem 0 3rem;
}

.friend-card img {
    width: 100px; height: 100px; border-radius: 50%;
    object-fit: cover; border: 1px solid var(--border-hi);
    filter: grayscale(20%); display: block;
}

/* ── Text container ── */
.text-container { text-align: left; }

/* "Teaching" heading */
.text-container > h1 {
    font-family: 'Syne', sans-serif; font-weight: 300;
    font-size: clamp(1.1rem, 2.5vw, 1.5rem);
    letter-spacing: 0.02em; color: var(--accent);
    margin-bottom: 2.5rem; padding-bottom: 0.6rem;
    border-bottom: 1px solid var(--border);
}

/* Institution */
.text-container > h2 {
    font-family: 'Syne', sans-serif; font-weight: 300;
    font-size: clamp(1.0rem, 2.2vw, 1.3rem); letter-spacing: 0.02em;
    text-transform: none; color: var(--accent);
    margin-bottom: 1.5rem; margin-top: 3.5rem;
    padding-bottom: 0.6rem;
    border-bottom: 1px solid var(--border);
}

/* Semester */
.text-container > h3 {
    font-family: 'Syne', sans-serif; font-weight: 600;
    font-size: 0.78rem; letter-spacing: 0.1em;
    text-transform: uppercase; color: var(--accent);
    margin-top: 2.2rem; margin-bottom: 0.9rem;
}

/* ── Teaching block ── */
.teaching-block {
    padding: 0.9rem 0 0.9rem 1.1rem;
    border-left: 2px solid var(--border);
    margin-bottom: 0;
    transition: border-color 0.2s;
}

.teaching-block + .teaching-block {
    border-top: 1px solid var(--border);
}

.teaching-block:hover { border-left-color: var(--accent); }

.teaching-block p {
    font-family: 'DM Sans', sans-serif;
    font-size: 0.85rem; font-weight: 300;
    line-height: 1.6; color: var(--dim);
    margin-bottom: 0.2rem; text-align: left;
}

.teaching-block p:last-child { margin-bottom: 0; }

.teaching-block strong {
    font-weight: 400; color: var(--text);
}

.course-label {
    font-size: 0.7rem; letter-spacing: 0.1em;
    color: var(--muted); text-transform: uppercase;
    transition: color 0.2s;
}

.teaching-block:hover .course-label {
    color: var(--accent);
}

/* ── Semester group wrapper ── */
.semester-group { margin-bottom: 0.4rem; }

/* Links */
a { color: var(--text); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--accent); }

/* Footer */
.site-footer {
    position: relative; z-index: 1;
    text-align: center; padding: 16px 0 20px;
    color: var(--muted); font-size: 0.55rem;
    letter-spacing: 0.15em; text-transform: uppercase;
    opacity: 0.75; border-top: 1px solid var(--border-hi);
}
.site-footer p { font-size: 0.55rem; letter-spacing: 0.15em; margin: 0; }
.site-footer a {
    text-decoration: none; color: var(--muted);
    font-size: inherit; letter-spacing: inherit;
    text-transform: inherit; transition: opacity 0.3s ease;
}
.site-footer a:hover { opacity: 0.7; }

@media (max-width: 600px) {
    main { padding: 3rem 1.25rem 5rem; }
    nav  { padding: 0.75rem 1.25rem; }
    #language-list { right: 1.25rem; }
}
/* Teaching Philosophy link block */
.philosophy-link-block {
    text-align: center;
    margin: 2.5rem auto 1rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
    max-width: 600px;
}

.philosophy-link-block a {
    font-size: 0.72rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--muted);
    text-decoration: none;
    transition: color 0.2s;
}

.philosophy-link-block a:hover {
    color: var(--accent);
}

/* Page header (replaces portrait block) */
.page-header {
    text-align: center;
    margin-bottom: 0.5rem;
}

.page-header h1 {
    font-family: 'DM Sans', sans-serif;
    font-weight: 400;
    font-size: clamp(1.2rem, 3vw, 1.7rem);
    letter-spacing: 0.01em;
    color: var(--text);
    margin-bottom: 0.3rem;
}

.page-subtitle {
    font-size: 0.65rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--muted);
}

/* ── Tab bar ── */
.tab-bar {
    display: flex;
    gap: 0;
    border: 1px solid var(--border);
    border-radius: 2rem;
    overflow: hidden;
    margin: 1.5rem auto 2.5rem;
    width: fit-content;
    background: rgba(255,255,255,0.02);
}

.tab {
    background: none;
    border: none;
    color: var(--dim);
    font-family: 'DM Sans', sans-serif;
    font-size: 0.65rem;
    letter-spacing: 0.13em;
    text-transform: uppercase;
    padding: 0.55rem 1.6rem;
    cursor: pointer;
    transition: color 0.2s, background 0.2s;
    position: relative;
}

.tab + .tab {
    border-left: 1px solid var(--border);
}

.tab.active {
    color: var(--text);
    background: rgba(255,255,255,0.08);
    font-weight: 400;
}

.tab:hover:not(.active) {
    color: var(--text);
    background: rgba(255,255,255,0.04);
}

/* ── Tab content panels ── */
.tab-content {
    display: none;
    animation: fadeUp 0.35s ease both;
    width: 100%;
}

.tab-content.active {
    display: block;
}

/* ── Philosophy embed panel ── */
.philosophy-embed {
    padding: 2rem 0;
    min-height: 200px;
}

.philosophy-note {
    text-align: center;
    color: var(--muted);
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    padding: 3rem;
}

/* Remove old philosophy link block if still present */
.philosophy-link-block { display: none; }

/* ── Embedded philosophy accordion ── */
.philosophy-embed {
    padding: 0.5rem 0 3rem;
}

.philo-title {
    font-family: 'Syne', sans-serif;
    font-weight: 600;
    font-size: clamp(1.1rem, 2.5vw, 1.5rem);
    color: var(--text);
    margin-bottom: 0.4rem;
}

.philo-subtitle {
    font-size: 0.75rem;
    letter-spacing: 0.08em;
    color: var(--muted);
    margin-bottom: 2rem;
    font-style: italic;
}

.accordion-wrap { width: 100%; }

.accordion {
    border-bottom: 1px solid var(--border);
}

.accordion-header {
    width: 100%;
    background: none;
    border: none;
    padding: 1rem 0;
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text);
    transition: color 0.2s;
}

.accordion-header::after {
    content: '+';
    font-size: 1rem;
    color: var(--muted);
    transition: transform 0.25s;
    flex-shrink: 0;
    margin-left: 1rem;
}

.accordion-header.active::after {
    transform: rotate(45deg);
    color: var(--accent);
}

.accordion-header h2 {
    font-family: 'Syne', sans-serif;
    font-weight: 400;
    font-size: 0.88rem;
    letter-spacing: 0.04em;
    color: inherit;
    margin: 0;
}

.accordion-header:hover { color: var(--accent); }

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease;
}

.accordion-content.open {
    max-height: 2000px;
}

.accordion-inner {
    padding: 0.5rem 0 1.5rem;
    font-size: 0.82rem;
    line-height: 1.8;
    color: var(--dim);
}

.accordion-inner p { margin-bottom: 0.8rem; }
.accordion-inner p:last-child { margin-bottom: 0; }
.accordion-inner ul { padding-left: 1.2rem; margin: 0.5rem 0; }
.accordion-inner li { margin-bottom: 0.3rem; }