/* ============================================================
   ZUBAIR IDRIS AWEDA — Portfolio
   Aesthetic: Editorial/Academic Minimalist
   Fonts: Cormorant Garamond (display) + DM Mono (accent)
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,300;0,400;0,500;0,600;1,300;1,400&family=DM+Mono:ital,wght@0,300;0,400;0,500;1,300&family=Lora:ital,wght@0,400;0,500;1,400&display=swap');

/* ── Variables ────────────────────────────────────────────── */
:root {
    --bg: #F7F5F0;
    --bg-warm: #EFECE5;
    --ink: #0D0D0B;
    --ink-mid: #3A3A38;
    --ink-light: #7A7972;
    --accent: #1A3A5C;
    --amber: #C8873A;
    --amber-lt: #F0D9BE;
    --rule: #D8D4CC;
    --white: #FDFCFA;

    --font-display: 'Cormorant Garamond', Georgia, serif;
    --font-body: 'Lora', Georgia, serif;
    --font-mono: 'DM Mono', 'Courier New', monospace;

    --max-w: 1100px;
    --col-gap: 2.5rem;
    --section-pad: 7rem 0;
    --nav-h: 64px;

    --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
    scroll-behavior: smooth;
    font-size: 17px;
}

body {
    background: var(--bg);
    color: var(--ink);
    font-family: var(--font-body);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

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

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

/* ── Utilities ────────────────────────────────────────────── */
.container {
    width: min(var(--max-w), 92vw);
    margin-inline: auto;
}

.section {
    padding: var(--section-pad);
}

.section--alt {
    background: var(--bg-warm);
}

.section-label {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--amber);
    margin-bottom: 0.5rem;
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2.2rem, 5vw, 3.4rem);
    font-weight: 300;
    line-height: 1.1;
    color: var(--ink);
    margin-bottom: 0.4rem;
}

.section-title em {
    font-style: italic;
    color: var(--accent);
}

.section-rule {
    width: 48px;
    height: 1px;
    background: var(--amber);
    margin: 1.6rem 0 3rem;
}

/* Fade-in animation */
.reveal {
    opacity: 0;
    transform: translateY(22px);
    transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.reveal.visible {
    opacity: 1;
    transform: none;
}

/* ── Navigation ───────────────────────────────────────────── */
#nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-h);
    z-index: 100;
    transition: background 0.4s, box-shadow 0.4s;
}

#nav.scrolled {
    background: rgba(247, 245, 240, 0.96);
    backdrop-filter: blur(12px);
    box-shadow: 0 1px 0 var(--rule);
}

.nav-inner {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 500;
    letter-spacing: 0.02em;
}

.nav-logo span {
    color: var(--amber);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2.2rem;
}

.nav-links a {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--ink-mid);
    position: relative;
    transition: color 0.2s;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--amber);
    transform: scaleX(0);
    transition: transform 0.25s var(--ease);
    transform-origin: left;
}

.nav-links a:hover {
    color: var(--ink);
}

.nav-links a:hover::after {
    transform: scaleX(1);
}

.nav-cta {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    padding: 0.5rem 1.2rem;
    border: 1px solid var(--ink);
    color: var(--ink);
    transition: background 0.2s, color 0.2s;
}

.nav-cta:hover {
    background: var(--ink);
    color: var(--bg);
}

.nav-burger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    background: none;
    border: none;
    padding: 4px;
}

.nav-burger span {
    display: block;
    width: 24px;
    height: 1.5px;
    background: var(--ink);
    transition: transform 0.3s, opacity 0.3s;
}

/* ── Hero ─────────────────────────────────────────────────── */
#hero {
    min-height: 100svh;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding-bottom: 6rem;
    padding-top: calc(var(--nav-h) + 4rem);
    position: relative;
    overflow: hidden;
}

.hero-grid-bg {
    position: absolute;
    inset: 0;
    background-image: linear-gradient(var(--rule) 1px, transparent 1px),
    linear-gradient(90deg, var(--rule) 1px, transparent 1px);
    background-size: 60px 60px;
    opacity: 0.4;
    pointer-events: none;
}

.hero-grid-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse 70% 60% at 50% 100%, var(--bg) 40%, transparent 100%);
}

.hero-eyebrow {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--amber);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.hero-eyebrow::before {
    content: '';
    display: inline-block;
    width: 32px;
    height: 1px;
    background: var(--amber);
}

.hero-name {
    font-family: var(--font-display);
    font-size: clamp(3.5rem, 10vw, 8rem);
    font-weight: 300;
    line-height: 0.95;
    letter-spacing: -0.01em;
    margin-bottom: 1.6rem;
}

.hero-name .line2 {
    font-style: italic;
    color: var(--accent);
}

.hero-tagline {
    font-family: var(--font-body);
    font-size: clamp(1rem, 2vw, 1.2rem);
    color: var(--ink-mid);
    max-width: 520px;
    line-height: 1.7;
    margin-bottom: 3rem;
}

.hero-ctas {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 4rem;
}

.btn {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    padding: 0.85rem 2rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.25s var(--ease);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--accent);
    color: var(--white);
}

.btn-primary:hover {
    background: var(--ink);
    transform: translateY(-2px);
}

.btn-secondary {
    background: transparent;
    color: var(--ink);
    border: 1px solid var(--ink);
}

.btn-secondary:hover {
    background: var(--ink);
    color: var(--bg);
    transform: translateY(-2px);
}

.btn-ghost {
    background: transparent;
    color: var(--ink-mid);
    border: 1px solid var(--rule);
}

.btn-ghost:hover {
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-2px);
}

.hero-socials {
    display: flex;
    align-items: center;
    gap: 1.8rem;
}

.hero-socials a {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--ink-light);
    transition: color 0.2s;
}

.hero-socials a:hover {
    color: var(--amber);
}

.hero-socials::before {
    content: '';
    display: block;
    width: 1px;
    height: 60px;
    background: var(--rule);
}

.hero-scroll {
    position: absolute;
    right: 4%;
    bottom: 3rem;
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--ink-light);
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.hero-scroll::after {
    content: '';
    display: block;
    width: 1px;
    height: 48px;
    background: var(--rule);
    animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
    0%, 100% {
        opacity: 0.3;
        transform: scaleY(0.6);
    }
    50% {
        opacity: 1;
        transform: scaleY(1);
    }
}

/* ── About ────────────────────────────────────────────────── */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--col-gap);
    align-items: start;
}

.about-bio p {
    margin-bottom: 1.2rem;
    color: var(--ink-mid);
}

.about-bio p:first-child {
    font-size: 1.1rem;
    color: var(--ink);
}

.about-meta {
    padding-top: 0.5rem;
}

.meta-block {
    border-top: 1px solid var(--rule);
    padding: 1.4rem 0;
}

.meta-block:last-child {
    border-bottom: 1px solid var(--rule);
}

.meta-label {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--amber);
    margin-bottom: 0.6rem;
}

.meta-value {
    font-size: 0.95rem;
    color: var(--ink-mid);
    line-height: 1.6;
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.4rem;
}

.tag {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    padding: 0.3rem 0.7rem;
    background: var(--amber-lt);
    color: var(--ink);
    letter-spacing: 0.05em;
}

/* ── Experience ───────────────────────────────────────────── */
.exp-list {
    display: flex;
    flex-direction: column;
}

.exp-item {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 2rem;
    padding: 2.5rem 0;
    border-top: 1px solid var(--rule);
    position: relative;
}

.exp-item:last-child {
    border-bottom: 1px solid var(--rule);
}

.exp-meta {
    padding-top: 0.2rem;
}

.exp-date {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    letter-spacing: 0.1em;
    color: var(--ink-light);
    margin-bottom: 0.4rem;
}

.exp-company {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 500;
    color: var(--accent);
    margin-bottom: 0.2rem;
}

.exp-type {
    font-family: var(--font-mono);
    font-size: 0.62rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--amber);
}

.exp-role {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 400;
    margin-bottom: 0.8rem;
    color: var(--ink);
}

.exp-bullets {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.exp-bullets li {
    color: var(--ink-mid);
    font-size: 0.93rem;
    padding-left: 1.2rem;
    position: relative;
}

.exp-bullets li::before {
    content: '—';
    position: absolute;
    left: 0;
    color: var(--amber);
    font-family: var(--font-mono);
}

.exp-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-top: 1rem;
}

.exp-stack span {
    font-family: var(--font-mono);
    font-size: 0.62rem;
    padding: 0.25rem 0.6rem;
    border: 1px solid var(--rule);
    color: var(--ink-light);
    letter-spacing: 0.05em;
}

/* ── Projects ─────────────────────────────────────────────── */
.projects-filter {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 3rem;
}

.filter-btn {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    padding: 0.4rem 1rem;
    border: 1px solid var(--rule);
    background: transparent;
    color: var(--ink-light);
    cursor: pointer;
    transition: all 0.2s;
}

.filter-btn.active,
.filter-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: rgba(26, 58, 92, 0.04);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5px;
    background: var(--rule);
    border: 1.5px solid var(--rule);
}

.project-card {
    background: var(--bg);
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    transition: background 0.25s;
    cursor: default;
}

.project-card:hover {
    background: var(--white);
}

.project-card.hidden {
    display: none;
}

.project-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
}

.project-name {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 500;
    color: var(--ink);
    line-height: 1.2;
}

.project-links {
    display: flex;
    gap: 0.5rem;
    flex-shrink: 0;
}

.project-links a {
    font-family: var(--font-mono);
    font-size: 0.6rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--ink-light);
    border: 1px solid var(--rule);
    padding: 0.2rem 0.5rem;
    transition: all 0.2s;
}

.project-links a:hover {
    border-color: var(--amber);
    color: var(--amber);
}

.project-category-badge {
    font-family: var(--font-mono);
    font-size: 0.6rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--amber);
}

.project-desc {
    font-size: 0.9rem;
    color: var(--ink-mid);
    line-height: 1.65;
    flex: 1;
}

.project-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: auto;
    padding-top: 0.8rem;
    border-top: 1px solid var(--rule);
}

.project-lang {
    font-family: var(--font-mono);
    font-size: 0.62rem;
    color: var(--ink-light);
    letter-spacing: 0.05em;
}

.project-stars {
    font-family: var(--font-mono);
    font-size: 0.62rem;
    color: var(--ink-light);
}

/* ── Research ─────────────────────────────────────────────── */
.research-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
}

.research-interests {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    border: 1px solid var(--rule);
}

.interest-item {
    padding: 1.5rem;
    border-right: 1px solid var(--rule);
    border-bottom: 1px solid var(--rule);
}

.interest-item:nth-child(even) {
    border-right: none;
}

.interest-item:nth-last-child(-n+2) {
    border-bottom: none;
}

.interest-icon {
    font-size: 1.4rem;
    margin-bottom: 0.6rem;
}

.interest-name {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 500;
    color: var(--accent);
    margin-bottom: 0.3rem;
}

.interest-desc {
    font-size: 0.82rem;
    color: var(--ink-light);
    line-height: 1.5;
}

.pubs-list {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.pub-item {
    padding: 1.5rem 0;
    border-bottom: 1px solid var(--rule);
}

.pub-item:first-child {
    border-top: 1px solid var(--rule);
}

.pub-venue {
    font-family: var(--font-mono);
    font-size: 0.62rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--amber);
    margin-bottom: 0.4rem;
}

.pub-title {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 400;
    color: var(--ink);
    margin-bottom: 0.3rem;
    line-height: 1.3;
}

.pub-title a {
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s;
}

.pub-title a:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.pub-date {
    font-family: var(--font-mono);
    font-size: 0.62rem;
    color: var(--ink-light);
}

/* ── Speaking ─────────────────────────────────────────────── */
.speaking-list {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.talk-item {
    display: grid;
    grid-template-columns: 140px 1fr;
    gap: 2rem;
    padding: 1.6rem 0;
    border-bottom: 1px solid var(--rule);
    align-items: start;
}

.talk-item:first-child {
    border-top: 1px solid var(--rule);
}

.talk-date {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    letter-spacing: 0.08em;
    color: var(--ink-light);
    padding-top: 0.2rem;
}

.talk-title {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 400;
    color: var(--ink);
    margin-bottom: 0.2rem;
}

.talk-event {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.08em;
    color: var(--amber);
}

/* ── Writing / Blog ───────────────────────────────────────── */
.writing-intro {
    max-width: 520px;
    color: var(--ink-mid);
    margin-bottom: 3rem;
    font-size: 0.95rem;
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1px;
    background: var(--rule);
    border: 1px solid var(--rule);
}

.article-card {
    background: var(--bg);
    padding: 1.8rem;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    transition: background 0.2s;
}

.article-card:hover {
    background: var(--white);
}

.article-card a {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    height: 100%;
}

.article-source {
    font-family: var(--font-mono);
    font-size: 0.62rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--amber);
}

.article-title {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 400;
    color: var(--ink);
    line-height: 1.35;
    flex: 1;
    transition: color 0.2s;
}

.article-card:hover .article-title {
    color: var(--accent);
}

.article-date {
    font-family: var(--font-mono);
    font-size: 0.62rem;
    color: var(--ink-light);
    margin-top: auto;
}

.articles-loading {
    grid-column: 1 / -1;
    padding: 3rem;
    text-align: center;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    color: var(--ink-light);
    text-transform: uppercase;
}

.writing-more {
    margin-top: 2rem;
    text-align: right;
}

/* ── Teaching ─────────────────────────────────────────────── */
.teaching-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

.teaching-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.teaching-item {
    padding-left: 1.5rem;
    border-left: 2px solid var(--amber-lt);
    transition: border-color 0.2s;
}

.teaching-item:hover {
    border-color: var(--amber);
}

.teaching-role {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--ink);
    margin-bottom: 0.2rem;
}

.teaching-org {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.08em;
    color: var(--amber);
    margin-bottom: 0.3rem;
}

.teaching-desc {
    font-size: 0.88rem;
    color: var(--ink-mid);
}

/* ── Skills ───────────────────────────────────────────────── */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0;
    border: 1px solid var(--rule);
}

.skill-group {
    padding: 2rem;
    border-right: 1px solid var(--rule);
}

.skill-group:last-child {
    border-right: none;
}

.skill-group-label {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--amber);
    margin-bottom: 1.2rem;
}

.skill-items {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.skill-item {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--ink-mid);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.skill-item::before {
    content: '';
    display: block;
    width: 4px;
    height: 4px;
    background: var(--amber);
    flex-shrink: 0;
}

/* ── Contact ──────────────────────────────────────────────── */
#contact {
    background: var(--ink);
    color: var(--bg);
}

#contact .section-title {
    color: var(--bg);
}

#contact .section-title em {
    color: var(--amber);
}

#contact .section-rule {
    background: var(--amber-lt);
}

#contact .section-label {
    color: var(--amber);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
}

.contact-text {
    font-size: 1.05rem;
    color: rgba(247, 245, 240, 0.7);
    line-height: 1.75;
    max-width: 420px;
}

.contact-options {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.contact-option {
    border: 1px solid rgba(255, 255, 255, 0.12);
    padding: 1.8rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    transition: border-color 0.25s, background 0.25s;
}

.contact-option:hover {
    border-color: var(--amber);
    background: rgba(200, 135, 58, 0.06);
}

.contact-option-label {
    font-family: var(--font-mono);
    font-size: 0.62rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--amber);
}

.contact-option-title {
    font-family: var(--font-display);
    font-size: 1.2rem;
    color: var(--bg);
}

.contact-option-desc {
    font-size: 0.85rem;
    color: rgba(247, 245, 240, 0.55);
    line-height: 1.6;
}

.contact-option .btn {
    margin-top: 0.8rem;
    align-self: flex-start;
}

.btn-amber {
    background: var(--amber);
    color: var(--ink);
}

.btn-amber:hover {
    background: #d4923f;
    transform: translateY(-2px);
}

.btn-outline-light {
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.25);
    color: var(--bg);
}

.btn-outline-light:hover {
    border-color: var(--bg);
    transform: translateY(-2px);
}

.contact-email {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.08em;
    color: rgba(247, 245, 240, 0.45);
    display: flex;
    align-items: center;
    gap: 1rem;
}

.contact-email a {
    color: var(--amber);
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s;
}

.contact-email a:hover {
    border-color: var(--amber);
}

/* ── Footer ───────────────────────────────────────────────── */
footer {
    background: var(--ink);
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    padding: 2rem 0;
}

.footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.footer-copy {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.08em;
    color: rgba(247, 245, 240, 0.3);
}

.footer-links {
    display: flex;
    gap: 1.8rem;
}

.footer-links a {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: rgba(247, 245, 240, 0.35);
    transition: color 0.2s;
}

.footer-links a:hover {
    color: var(--amber);
}

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 900px) {
    .about-grid,
    .research-grid,
    .contact-grid,
    .teaching-grid {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }

    .exp-item {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }

    .skills-grid {
        grid-template-columns: 1fr 1fr;
    }

    .skills-grid .skill-group:nth-child(2) {
        border-right: none;
    }

    .skills-grid .skill-group:nth-child(3) {
        border-right: none;
        border-top: 1px solid var(--rule);
        grid-column: 1 / -1;
    }

    .talk-item {
        grid-template-columns: 1fr;
        gap: 0.3rem;
    }

    .talk-date {
        font-size: 0.62rem;
    }
}

@media (max-width: 680px) {
    :root {
        --section-pad: 4.5rem 0;
    }

    .nav-links {
        display: none;
        position: fixed;
        top: var(--nav-h);
        left: 0;
        right: 0;
        background: var(--bg);
        flex-direction: column;
        padding: 2rem;
        border-top: 1px solid var(--rule);
        box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
    }

    .nav-links.open {
        display: flex;
    }

    .nav-burger {
        display: flex;
    }

    .skills-grid {
        grid-template-columns: 1fr;
    }

    .skills-grid .skill-group {
        border-right: none;
        border-bottom: 1px solid var(--rule);
    }

    .skills-grid .skill-group:last-child {
        border-bottom: none;
    }

    .research-interests {
        grid-template-columns: 1fr;
    }

    .interest-item {
        border-right: none;
    }

    .interest-item:nth-last-child(-n+2) {
        border-bottom: 1px solid var(--rule);
    }

    .interest-item:last-child {
        border-bottom: none;
    }

    .footer-inner {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }

    .hero-scroll {
        display: none;
    }
}