/* ==========================================================================
   Sidharth Kaliappan — Personal Website
   Palette: Sage & Mint · Typography: Cormorant Garamond + DM Sans
   ========================================================================== */

:root {
    /* Lighter green palette — sage / mint / moss */
    --bg:            #f6f9f3;          /* page background, very soft mint */
    --bg-alt:        #eef4e8;          /* alternate section bg */
    --bg-card:       #ffffff;          /* card / elevated surfaces */
    --bg-warm:       #faf8f1;          /* cream accent for asides */

    --ink:           #1f2a22;          /* headings, strong text */
    --ink-soft:      #3d4a3f;          /* body text */
    --ink-mute:      #6b7a6e;          /* muted metadata */

    --sage-50:       #f0f5eb;
    --sage-100:      #dfe9d4;
    --sage-200:      #c3d7b0;
    --sage-300:      #9fbf86;
    --sage-400:      #7ba65d;
    --sage-500:      #5a8a42;          /* primary accent */
    --sage-600:      #456b33;
    --sage-700:      #2f4a22;          /* deepest accent */

    --accent:        #5a8a42;
    --accent-soft:   #9fbf86;
    --accent-warm:   #b8a160;          /* olive-gold accent for tags */

    --rule:          #d6dfc9;
    --rule-soft:     #e8ede0;

    /* Fonts */
    --font-display:  'Cormorant Garamond', 'Times New Roman', serif;
    --font-body:     'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono:     'JetBrains Mono', 'Menlo', monospace;

    /* Layout */
    --max-w:         1200px;
    --radius-sm:     6px;
    --radius-md:     14px;
    --radius-lg:     22px;

    /* Motion */
    --ease:          cubic-bezier(0.4, 0, 0.2, 1);
    --ease-out:      cubic-bezier(0.16, 1, 0.3, 1);
}

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

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-body);
    font-size: 17px;
    line-height: 1.65;
    color: var(--ink-soft);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* Subtle grain overlay on body for warmth */
body::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 1;
    opacity: 0.025;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

a { color: var(--sage-600); text-decoration: none; transition: color 0.2s var(--ease); }
a:hover { color: var(--sage-700); }

img { max-width: 100%; display: block; }

.container {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 0 2rem;
    position: relative;
    z-index: 2;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4 {
    font-family: var(--font-display);
    color: var(--ink);
    font-weight: 500;
    line-height: 1.15;
    letter-spacing: -0.01em;
}

h1 { font-size: clamp(3.5rem, 8vw, 6.5rem); font-weight: 500; }
h2 { font-size: clamp(2.25rem, 4.5vw, 3.25rem); }
h3 { font-size: 1.5rem; font-weight: 600; }

p { margin-bottom: 1rem; }
strong { color: var(--ink); font-weight: 600; }
em { font-style: italic; }

/* ---------- Navbar ---------- */
#navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    background: rgba(246, 249, 243, 0.82);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid transparent;
    transition: all 0.3s var(--ease);
}

#navbar.scrolled {
    border-bottom-color: var(--rule);
    background: rgba(246, 249, 243, 0.94);
}

.nav-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--ink);
    letter-spacing: 0.02em;
}

.logo-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    background: var(--sage-500);
    color: #fff;
    border-radius: 50%;
    font-family: var(--font-body);
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.05em;
}

.logo-name { display: none; }
@media (min-width: 700px) { .logo-name { display: inline; } }

.nav-menu {
    display: flex;
    list-style: none;
    gap: 0.25rem;
    align-items: center;
}

.nav-link {
    display: inline-block;
    padding: 0.5rem 0.9rem;
    font-size: 0.92rem;
    font-weight: 500;
    color: var(--ink-soft);
    border-radius: var(--radius-sm);
    transition: all 0.2s var(--ease);
}

.nav-link:hover {
    color: var(--sage-700);
    background: var(--sage-50);
}

.nav-cv {
    margin-left: 0.4rem;
    padding-left: 1rem;
    padding-right: 1rem;
    background: var(--ink);
    color: #fff;
}
.nav-cv:hover { background: var(--sage-700); color: #fff; }
.nav-cv svg { width: 12px; height: 12px; margin-left: 0.3rem; vertical-align: -1px; }

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 8px;
}
.hamburger span {
    width: 24px;
    height: 2px;
    background: var(--ink);
    transition: all 0.3s var(--ease);
}

@media (max-width: 860px) {
    .nav-menu {
        position: fixed;
        top: 72px;
        right: 0;
        width: min(320px, 80vw);
        height: calc(100vh - 72px);
        background: var(--bg);
        border-left: 1px solid var(--rule);
        flex-direction: column;
        align-items: flex-start;
        padding: 2rem 1.5rem;
        gap: 0.25rem;
        transform: translateX(100%);
        transition: transform 0.35s var(--ease);
    }
    .nav-menu.open { transform: translateX(0); }
    .nav-menu li { width: 100%; }
    .nav-link { display: block; width: 100%; font-size: 1.05rem; padding: 0.75rem 1rem; }
    .hamburger { display: flex; }
    .hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
    .hamburger.open span:nth-child(2) { opacity: 0; }
    .hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
}

/* ---------- Hero ---------- */
.hero {
    position: relative;
    padding: 10rem 0 6rem;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
    background:
        radial-gradient(ellipse at 15% 20%, rgba(159, 191, 134, 0.22), transparent 55%),
        radial-gradient(ellipse at 85% 80%, rgba(184, 161, 96, 0.12), transparent 50%),
        linear-gradient(180deg, var(--bg) 0%, var(--bg-alt) 100%);
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.3fr 1fr;
    gap: 4rem;
    align-items: center;
}

@media (max-width: 900px) {
    .hero-grid { grid-template-columns: 1fr; gap: 3rem; }
    .hero { padding: 8rem 0 4rem; }
}

.hero-text { animation: fadeInUp 1s var(--ease-out) both; }

.eyebrow {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--sage-600);
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--sage-200);
}

.hero-title {
    line-height: 0.95;
    margin-bottom: 1.75rem;
    color: var(--ink);
}
.hero-title em {
    color: var(--sage-600);
    font-weight: 400;
}

.hero-lede {
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-style: italic;
    line-height: 1.45;
    color: var(--ink-soft);
    max-width: 32rem;
    margin-bottom: 1.5rem;
}

.hero-affiliation {
    font-size: 0.95rem;
    color: var(--ink-mute);
    margin-bottom: 2rem;
}
.affiliation-school {
    color: var(--ink);
    font-weight: 500;
}

.hero-advisor {
    display: flex;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 0.65rem;
    margin-bottom: 2rem;
    padding: 0.5rem 0;
    border-top: 1px solid var(--rule);
    border-bottom: 1px solid var(--rule);
    max-width: 30rem;
}
.advisor-label {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--ink-mute);
}
.hero-advisor a {
    font-family: var(--font-display);
    font-size: 1.1rem;
    color: var(--ink);
    font-weight: 600;
    transition: color 0.2s var(--ease);
}
.hero-advisor a:hover {
    color: var(--sage-600);
}

.hero-actions {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-bottom: 2.5rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.4rem;
    font-size: 0.92rem;
    font-weight: 500;
    border-radius: 999px;
    transition: all 0.25s var(--ease);
    border: 1px solid transparent;
    cursor: pointer;
}

.btn-primary {
    background: var(--sage-500);
    color: #fff;
    box-shadow: 0 2px 8px rgba(90, 138, 66, 0.18);
}
.btn-primary:hover {
    background: var(--sage-700);
    color: #fff;
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(90, 138, 66, 0.25);
}

.btn-ghost {
    background: transparent;
    color: var(--ink);
    border-color: var(--sage-200);
}
.btn-ghost:hover {
    background: var(--sage-50);
    border-color: var(--sage-300);
    color: var(--ink);
}

.social-links {
    display: flex;
    gap: 0.6rem;
}
.social-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: var(--bg-card);
    border: 1px solid var(--rule);
    color: var(--ink-soft);
    font-size: 0.95rem;
    transition: all 0.25s var(--ease);
}
.social-links a:hover {
    background: var(--sage-500);
    border-color: var(--sage-500);
    color: #fff;
    transform: translateY(-2px);
}
.social-links a svg { width: 18px; height: 18px; }
.btn svg { width: 16px; height: 16px; flex-shrink: 0; }

/* Hero visual */
.hero-visual {
    position: relative;
    animation: fadeInUp 1s 0.15s var(--ease-out) both;
}

.profile-frame {
    position: relative;
    width: min(330px, 88%);
    margin: 0 auto;
    aspect-ratio: 1 / 1;
}

.profile-frame-inner {
    position: relative;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    overflow: hidden;
    background: var(--sage-100);
    box-shadow:
        0 1px 2px rgba(31, 42, 34, 0.04),
        0 18px 38px rgba(31, 42, 34, 0.12);
    z-index: 2;
}

.profile-frame-inner img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center 25%;
    filter: saturate(0.92);
}

.frame-deco {
    position: absolute;
    border-radius: 50%;
    z-index: 1;
}
.frame-deco-1 {
    inset: -14px;
    width: auto;
    height: auto;
    background: transparent;
    border: 1.5px solid var(--sage-300);
}
.frame-deco-2 {
    inset: auto auto -16px -16px;
    width: 46%;
    height: 46%;
    background: var(--sage-100);
    border-radius: 50%;
    z-index: 0;
}

.hero-badge {
    position: absolute;
    bottom: -10px;
    right: -10px;
    background: var(--bg-warm);
    border: 1px solid var(--rule);
    padding: 0.75rem 1.1rem;
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    box-shadow: 0 6px 18px rgba(31, 42, 34, 0.08);
    z-index: 3;
}
.badge-label {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.68rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--ink-mute);
    margin-bottom: 0.15rem;
}
.hero-badge a {
    font-family: var(--font-display);
    font-size: 1.05rem;
    color: var(--ink);
    font-weight: 600;
}
.hero-badge a:hover { color: var(--sage-600); }

@media (max-width: 900px) {
    .profile-frame { margin-left: 0; }
    .hero-badge { right: auto; left: 60%; }
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(24px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ---------- Section scaffolding ---------- */
section { padding: 6rem 0; position: relative; }
section:nth-child(even) { background: var(--bg-alt); }
.about { background: var(--bg); }
.news { background: var(--bg-alt); }
.publications { background: var(--bg); }
.research { background: var(--bg-alt); }
.teaching { background: var(--bg); }
.talks { background: var(--bg-alt); }
.skills { background: var(--bg); }
.contact { background: var(--bg-alt); }
.participate { background: var(--bg); }

/* ---------- Participate / Recruitment ---------- */
.participate-card {
    display: grid;
    grid-template-columns: 1.7fr 1fr;
    gap: 3rem;
    align-items: center;
    background: linear-gradient(135deg, var(--sage-50) 0%, var(--bg-warm) 100%);
    border: 1px solid var(--sage-200);
    border-radius: var(--radius-lg);
    padding: 3rem 3.25rem;
}
.participate-text { min-width: 0; }
.participate-eyebrow {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--sage-600);
    margin-bottom: 1rem;
}
.participate-card h2 {
    font-size: 2.1rem;
    font-style: italic;
    margin-bottom: 1rem;
    color: var(--ink);
}
.participate-text > p {
    font-size: 1.02rem;
    color: var(--ink-soft);
    max-width: 40rem;
    margin-bottom: 1.5rem;
}
.participate-details {
    list-style: none;
    margin-bottom: 1.75rem;
}
.participate-details li {
    display: flex;
    gap: 1rem;
    align-items: baseline;
    font-size: 0.95rem;
    color: var(--ink-soft);
    padding: 0.55rem 0;
    border-bottom: 1px solid var(--rule-soft);
    line-height: 1.5;
}
.participate-details li:last-child { border-bottom: none; }
.pd-label {
    flex: 0 0 7rem;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--sage-600);
    padding-top: 0.15rem;
}
.pd-text {
    flex: 1 1 auto;
    min-width: 0;
}
.participate-btn { text-decoration: none; }
.participate-qr {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    min-width: 0;
}
.participate-qr img {
    width: 190px;
    height: 190px;
    background: #fff;
    padding: 12px;
    border-radius: var(--radius-md);
    border: 1px solid var(--rule);
    box-shadow: 0 6px 18px rgba(31, 42, 34, 0.08);
}
.participate-qr-label {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--ink-mute);
    text-align: center;
}

@media (max-width: 768px) {
    .participate-card { grid-template-columns: 1fr; gap: 2rem; padding: 2rem; }
    .participate-qr { order: -1; }
    .pd-label { flex-basis: 6rem; }
}

.section-header {
    display: flex;
    align-items: baseline;
    gap: 1.25rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}
.section-number {
    display: none;
}
.section-title {
    font-style: italic;
    color: var(--ink);
}
.section-rule {
    flex: 1;
    min-width: 60px;
    height: 1px;
    background: linear-gradient(90deg, var(--sage-300), transparent);
    margin-bottom: 0.75rem;
}

.section-intro {
    margin-top: -1rem;
    margin-bottom: 2.5rem;
    font-size: 0.95rem;
    color: var(--ink-mute);
}

/* ---------- About ---------- */
.about-grid {
    display: grid;
    grid-template-columns: 1.6fr 1fr;
    gap: 4rem;
    align-items: start;
}

@media (max-width: 860px) {
    .about-grid { grid-template-columns: 1fr; gap: 2.5rem; }
}

.about-prose .lead {
    font-family: var(--font-display);
    font-size: 1.5rem;
    line-height: 1.4;
    color: var(--ink);
    font-weight: 500;
    margin-bottom: 1.5rem;
}

.about-prose p {
    font-size: 1.05rem;
    color: var(--ink-soft);
}

.about-side { display: flex; flex-direction: column; gap: 1.5rem; }

.interests-card,
.education-card {
    background: var(--bg-card);
    border: 1px solid var(--rule);
    border-radius: var(--radius-md);
    padding: 1.75rem;
}

.interests-card h3,
.education-card h3 {
    font-size: 0.8rem;
    font-family: var(--font-mono);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--sage-600);
    margin-bottom: 1.15rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--rule-soft);
}

.interests-list {
    list-style: none;
}
.interests-list li {
    position: relative;
    padding-left: 1.25rem;
    margin-bottom: 0.65rem;
    font-size: 0.95rem;
    color: var(--ink-soft);
}
.interests-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.7em;
    width: 6px;
    height: 6px;
    background: var(--sage-400);
    border-radius: 50%;
}

.edu-item { margin-bottom: 1rem; }
.edu-item:last-child { margin-bottom: 0; }
.edu-degree {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--ink);
    margin-bottom: 0.1rem;
}
.edu-school {
    font-size: 0.85rem;
    color: var(--ink-mute);
}

/* ---------- News / Timeline ---------- */
.news-timeline {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    max-width: 900px;
}

.news-item {
    display: grid;
    grid-template-columns: 80px 1fr;
    gap: 1.5rem;
    align-items: start;
    padding: 1.25rem 1.5rem;
    background: var(--bg-card);
    border: 1px solid var(--rule);
    border-radius: var(--radius-md);
    transition: all 0.3s var(--ease);
    position: relative;
}

.news-item:hover {
    border-color: var(--sage-300);
    transform: translateX(4px);
    box-shadow: 0 4px 12px rgba(31, 42, 34, 0.05);
}

.news-item.news-highlight {
    background: linear-gradient(120deg, var(--sage-50) 0%, var(--bg-card) 60%);
    border-left: 3px solid var(--sage-500);
}

.news-date {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    font-family: var(--font-display);
    line-height: 1;
}
.news-date .month {
    font-size: 0.95rem;
    color: var(--sage-600);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}
.news-date .year {
    font-size: 2rem;
    color: var(--ink);
    font-weight: 500;
    margin-top: 0.15rem;
}

.news-content p {
    margin-bottom: 0;
    color: var(--ink-soft);
    font-size: 1rem;
}

.news-tag {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.68rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding: 0.25rem 0.6rem;
    border-radius: 999px;
    margin-bottom: 0.5rem;
}
.tag-upcoming    { background: #fef6dc; color: #7a5d0a; }
.tag-accepted    { background: var(--sage-100); color: var(--sage-700); }
.tag-teaching    { background: #e8f0f7; color: #2a5a7a; }
.tag-publication { background: var(--sage-50); color: var(--sage-600); }
.tag-talk        { background: #f5e8f0; color: #7a2a5a; }
.tag-milestone   { background: #faf1e6; color: #7a4a0a; }
.tag-award       { background: #f3ecdb; color: #7a5a14; }

@media (max-width: 600px) {
    .news-item { grid-template-columns: 1fr; gap: 0.75rem; }
    .news-date { flex-direction: row; gap: 0.5rem; align-items: baseline; }
    .news-date .year { font-size: 1.3rem; }
}

/* ---------- Publications ---------- */
.pub-category {
    font-family: var(--font-display);
    font-style: italic;
    font-size: 1.5rem;
    color: var(--ink);
    margin-top: 3rem;
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--rule);
}
.pub-category:first-of-type { margin-top: 0; }

.publication-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.pub-item {
    display: grid;
    grid-template-columns: 64px 1fr;
    gap: 1.5rem;
    align-items: start;
    padding: 1.5rem 1.75rem;
    background: var(--bg-card);
    border: 1px solid var(--rule);
    border-radius: var(--radius-md);
    transition: all 0.3s var(--ease);
}

.pub-item:hover {
    border-color: var(--sage-300);
    box-shadow: 0 6px 22px rgba(31, 42, 34, 0.06);
    transform: translateY(-2px);
}

.pub-item.pub-accepted {
    background: linear-gradient(135deg, var(--sage-50) 0%, var(--bg-card) 60%);
    border-color: var(--sage-300);
}

.pub-marker {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 64px;
    background: var(--sage-500);
    color: #fff;
    font-family: var(--font-mono);
    font-size: 0.82rem;
    font-weight: 600;
    text-align: center;
    line-height: 1.2;
    border-radius: var(--radius-sm);
    letter-spacing: 0.04em;
}

.pub-item.pub-accepted .pub-marker {
    background: var(--sage-700);
}

.pub-marker-soft {
    background: transparent;
    color: var(--sage-600);
    border: 1px dashed var(--sage-300);
}

.pub-title {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 600;
    line-height: 1.35;
    color: var(--ink);
    margin-bottom: 0.5rem;
}
.pub-title a {
    color: var(--ink);
    background-image: linear-gradient(var(--sage-300), var(--sage-300));
    background-size: 0% 1px;
    background-position: 0 100%;
    background-repeat: no-repeat;
    transition: background-size 0.3s var(--ease);
}
.pub-title a:hover {
    color: var(--sage-700);
    background-size: 100% 1px;
}

.pub-authors {
    font-size: 0.95rem;
    color: var(--ink-soft);
    margin-bottom: 0.3rem;
}
.pub-authors strong { color: var(--sage-700); }
.pub-authors sup {
    font-size: 0.7em;
    color: var(--sage-600);
    font-weight: 600;
    margin-left: 1px;
}
.pub-equal {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--ink-mute);
    font-style: italic;
    letter-spacing: 0.02em;
    white-space: nowrap;
}

.pub-venue {
    font-size: 0.9rem;
    color: var(--ink-mute);
    margin-bottom: 0;
}

.pub-tags {
    display: flex;
    gap: 0.4rem;
    flex-wrap: wrap;
    margin-top: 0.75rem;
}
.pub-tag {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    padding: 0.2rem 0.55rem;
    background: var(--sage-100);
    color: var(--sage-700);
    border-radius: 999px;
}

@media (max-width: 600px) {
    .pub-item { grid-template-columns: 1fr; padding: 1.25rem; }
    .pub-marker {
        flex-direction: row;
        gap: 0.3rem;
        width: fit-content;
        min-height: 0;
        padding: 0.3rem 0.7rem;
    }
}

/* ---------- Research ---------- */
.research-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 1.5rem;
}

.research-item {
    background: var(--bg-card);
    border: 1px solid var(--rule);
    border-radius: var(--radius-md);
    padding: 2rem;
    transition: all 0.35s var(--ease);
    position: relative;
    overflow: hidden;
}

.research-item::before {
    content: "";
    position: absolute;
    top: 0; left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--sage-500), var(--sage-300));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s var(--ease);
}

.research-item:hover {
    border-color: var(--sage-300);
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(31, 42, 34, 0.08);
}
.research-item:hover::before { transform: scaleX(1); }

.research-header {
    display: flex;
    align-items: baseline;
    gap: 1rem;
    margin-bottom: 1rem;
}
.research-number {
    display: none;
}
.research-item h3 {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--ink);
    flex: 1;
}

.research-item p {
    font-size: 0.98rem;
    line-height: 1.7;
    color: var(--ink-soft);
    margin-bottom: 1.25rem;
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
}
.tags span {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    padding: 0.3rem 0.65rem;
    background: var(--sage-50);
    color: var(--sage-700);
    border: 1px solid var(--sage-100);
    border-radius: var(--radius-sm);
}

/* ---------- Teaching ---------- */
.teaching-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    max-width: 850px;
}

.teaching-item {
    display: grid;
    grid-template-columns: 28px 1fr;
    gap: 1.25rem;
    align-items: start;
    padding: 1.75rem;
    background: var(--bg-card);
    border: 1px solid var(--rule);
    border-radius: var(--radius-md);
    transition: all 0.3s var(--ease);
}

.teaching-item:hover {
    border-color: var(--sage-300);
    box-shadow: 0 4px 16px rgba(31, 42, 34, 0.06);
}

.teaching-marker {
    width: 12px;
    height: 12px;
    margin-top: 0.5rem;
    background: var(--sage-500);
    border-radius: 50%;
    box-shadow: 0 0 0 5px var(--sage-100);
}

.course-info {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 0.4rem;
}
.course-info h3 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    color: var(--ink);
}

.semester {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--sage-600);
    white-space: nowrap;
}

.role {
    font-size: 0.93rem;
    color: var(--ink-soft);
    font-weight: 500;
    margin-bottom: 0.4rem;
}
.role-detail {
    font-size: 0.92rem;
    color: var(--ink-mute);
    line-height: 1.6;
    margin-bottom: 0;
}

/* ---------- Talks & Service ---------- */
.talks-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 3.5rem;
    align-items: start;
}
.subcol-title {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--sage-600);
    margin-bottom: 1.25rem;
    padding-bottom: 0.6rem;
    border-bottom: 1px solid var(--rule);
    font-weight: 500;
}
.talk-item {
    padding: 1rem 0 1.25rem;
    border-bottom: 1px solid var(--rule-soft);
}
.talk-item:last-child { border-bottom: none; }
.talk-meta {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.4rem;
}
.talk-when {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--ink-mute);
    letter-spacing: 0.04em;
}
.talk-flag {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding: 0.15rem 0.5rem;
    border-radius: 999px;
    background: #fef6dc;
    color: #7a5d0a;
}
.talk-title {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--ink);
    margin-bottom: 0.15rem;
    line-height: 1.3;
}
.talk-where {
    font-size: 0.9rem;
    color: var(--ink-mute);
    margin-bottom: 0;
}
.service-card {
    background: var(--bg-card);
    border: 1px solid var(--rule);
    border-radius: var(--radius-md);
    padding: 1.25rem 1.4rem;
    margin-bottom: 0.75rem;
}
.service-main {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--ink);
    margin-bottom: 0.2rem;
}
.service-sub {
    font-size: 0.9rem;
    color: var(--ink-mute);
    margin-bottom: 0;
    line-height: 1.5;
}

@media (max-width: 768px) {
    .talks-grid { grid-template-columns: 1fr; gap: 2.5rem; }
}

/* ---------- Skills ---------- */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}
.skill-group {
    background: var(--bg-card);
    border: 1px solid var(--rule);
    border-radius: var(--radius-md);
    padding: 1.5rem 1.6rem;
}
.skill-group h3 {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--sage-600);
    font-weight: 500;
    margin-bottom: 1rem;
}
.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
}
.skill-tags span {
    font-size: 0.85rem;
    padding: 0.35rem 0.75rem;
    background: var(--sage-50);
    color: var(--sage-700);
    border: 1px solid var(--sage-100);
    border-radius: 999px;
}

/* ---------- Contact ---------- */
.contact-content { max-width: 900px; }
.contact-lede {
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-style: italic;
    line-height: 1.45;
    color: var(--ink);
    margin-bottom: 2.5rem;
    max-width: 40rem;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1rem;
}

.contact-card {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.35rem;
    padding: 1.5rem;
    background: var(--bg-card);
    border: 1px solid var(--rule);
    border-radius: var(--radius-md);
    color: var(--ink-soft);
    transition: all 0.3s var(--ease);
}

a.contact-card:hover {
    border-color: var(--sage-400);
    background: var(--sage-50);
    transform: translateY(-3px);
    color: var(--ink);
}

.contact-card svg {
    width: 22px;
    height: 22px;
    color: var(--sage-500);
    margin-bottom: 0.5rem;
}
.contact-label {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--ink-mute);
}
.contact-value {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--ink);
}

/* ---------- Footer ---------- */
footer {
    background: var(--ink);
    color: #c9d1c3;
    padding: 3rem 0;
    position: relative;
    z-index: 2;
}

.footer-grid {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.footer-name {
    font-family: var(--font-display);
    font-size: 1.3rem;
    color: #fff;
    margin-bottom: 0.15rem;
}
.footer-sub {
    font-size: 0.85rem;
    color: #8b9c85;
    margin-bottom: 0;
}

.footer-right {
    text-align: right;
    font-size: 0.85rem;
}
.footer-right p { margin-bottom: 0.15rem; }
.footer-note {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: #8b9c85;
}

@media (max-width: 520px) {
    .footer-grid { flex-direction: column; align-items: flex-start; }
    .footer-right { text-align: left; }
}

/* ---------- Reveal on scroll ---------- */
.reveal {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}
.reveal.in-view {
    opacity: 1;
    transform: translateY(0);
}

/* ---------- Scrollbar polish (WebKit) ---------- */
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--sage-200); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: var(--sage-400); }

::selection { background: var(--sage-200); color: var(--ink); }