:root {
    --primary: #6366f1;
    --primary-dark: #4f46cf;
    --primary-light: #eef0ff;
    --text: #17203f;
    --muted: #687087;
    --bg: #fafbff;
    --card: #ffffff;
    --border: #e5e7eb;
    --radius: 12px;
    --shadow: 0 8px 20px rgba(23, 32, 63, .06);
    --max-width: 1180px;
}

* { 
    box-sizing: border-box; 
}

html { 
    scroll-behavior: smooth; 
}

body {
    margin: 0;
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.55;
}

a { 
    color: var(--primary-dark); 
    text-decoration: none; 
}

a:hover { 
    text-decoration: underline; 
}

.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255,255,255,.94);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
}

.nav-container {
    max-width: var(--max-width);
    margin: auto;
    min-height: 64px;
    padding: 0 22px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 25px;
}

.brand {
    color: var(--text);
    font: 700 20px Georgia, serif;
    white-space: nowrap;
}

.nav-container nav {
    display: flex;
    align-items: stretch;
    gap: 2px;
}

.nav-container nav a {
    color: var(--text);
    font-size: 13px;
    text-transform: uppercase;
    padding: 22px 12px 17px;
    border-bottom: 2px solid transparent;
}

.nav-container nav a:hover, .nav-container nav a.active {
    color: var(--primary-dark);
    border-bottom-color: var(--primary);
    text-decoration: none;
}

.hero {
    width: 100%;
    aspect-ratio: 1600 / 500;
    margin: 0;
    padding: 0;
    position: relative;
    overflow: hidden;
    background-image: url("../assets/hero-banner.jpg");
    background-repeat: no-repeat;
    background-position: center top;
    background-size: cover;
    background-color: #dfe4ff;
}

.hero-copy {
    position: relative;
    z-index: 2;    
    width: 100%;
    max-width: var(--max-width);
    height: 100%;
    margin: 0 auto;
    padding: 50px 5vw 45px;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
}

.hero h1 {
    margin: 0 0 8px;
    font: 700 clamp(44px, 5vw, 78px)/.96 Georgia, serif;
    letter-spacing: -2px;
}

.hero h2 {
    margin: 12px 0 0;
    font: 700 clamp(24px, 2vw, 25px) Georgia, serif;
}

.university {
    margin: 0;
    color: var(--primary);
    font-size: clamp(15px, 1.6vw, 20px);
}

.areas {
    margin: 12px 0 20px;
    font-size: clamp(13px, 1.3vw, 15px);
}

.buttons {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
    margin-top: 10px;
}

.button {
    padding: 11px 20px;
    border: 1px solid var(--primary);
    border-radius: 6px;
    font-size: 14px;
    font-weight: 600;
}

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

.button.primary:hover {
    background: var(--primary-dark);
    text-decoration: none;
}

.button.secondary {
    color: var(--primary-dark);
    background: rgba(255,255,255,.9);
}

.button.secondary:hover {
    background: var(--primary-light);
    text-decoration: none;
}

.section {
    max-width: var(--max-width);
    margin: 14px auto 0;
    padding: 25px;
    background: rgba(255,255,255,.82);
    border: 1px solid #f0f1f6;
    border-radius: var(--radius);
}

.section-heading {
    display: flex;
    align-items: center;
    gap: 12px;
}

.section-heading h2 {
    margin: 0 0 18px;
    font: 700 24px Georgia, serif;
    color: var(--primary-dark);
}

.icon {
    color: var(--primary);
    font-size: 24px;
}

.section-heading-row {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.section-heading-row > a {
    font-size: 13px;
    margin-top: 4px;
}

.courses-section {
    width: 100%;
    max-width: none;
    margin: 14px 0 0;
    display: block;
    background: transparent;
    border: 0;
    padding: 10px 22px;
}

.section-main, .students-card {
    width: 100%;
    background: white;
    border: 1px solid #eef0f5;
    border-radius: var(--radius);
    padding: 22px;
    box-shadow: var(--shadow);
}

.course-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
}

.research-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 18px;
}

.course-card {
    overflow: hidden;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: white;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    text-align: center;
}

.course-card:not(.no-select):hover {
    text-decoration: none;
    transform: scale(1.03);
    border-color: #d7d9f4;
    box-shadow: 0 14px 34px rgba(23, 32, 63, .10);
}

.plain-link:hover {
    text-decoration: none;
}

.course-card.no-select:hover h6 {
    transform: scale(1.25);
    color: red;
}

.course-card h6 {
    text-align: center;
}

.course-image, .research-image {
    background-position: center;
    background-size: cover;
    background-color: #dfe4ff;
}

.course-image { 
    height: 118px; 
}

.course-image.COMP1405 {
    background-image: url("../assets/1405.jpg");
}

.course-image.COMP1406 {
    background-image: url("../assets/1406.jpg");
}

.course-image.COMP2401 {
    background-image: url("../assets/2401.jpg");
}

.course-image.COMP2406 {
    background-image: url("../assets/2406.jpg");
}

.course-image.COMP2801 {
    background-image: url("../assets/2801.jpg");
}

.course-image.COMP4807 {
    background-image: url("../assets/4807.jpg");
}

.research-image.simulation {
    background-image: url("../assets/research/icon1.jpg");
}
.research-image.compgeom {
    background-image: url("../assets/research/icon2.jpg");
}
.research-image.sensing {
    background-image: url("../assets/research/icon3.jpg");
}
.research-image.design {
    background-image: url("../assets/research/icon4.jpg");
}

.card-body { 
    padding: 13px; 
}
.card-body small { 
    color: var(--primary-dark); 
    font-weight: 700; 
}
.card-body h3 { 
    margin: 1px 0 6px; 
    font: 700 17px Georgia, serif; 
}
.card-body p { 
    margin: 0 0 10px; 
    font-size: 12.5px; 
    color: var(--muted); 
}
.card-body a { 
    font-size: 12px; 
    font-weight: 600; 
}

.center-link {
    display: block;
    width: fit-content;
    margin: 14px auto 0;
    font-size: 13px;
    font-weight: 600;
}

.students-card {
    background: linear-gradient(145deg,#fff,#f4f5ff);
}

.students-card ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.students-card li { 
    margin: 14px 0; 
}

.students-card li::before {
    content: "✧";
    color: var(--primary);
    margin-right: 10px;
}

.students-card a {
    color: var(--text);
    font-size: 13px;
}

.student-illustration {
    margin-top: 24px;
    color: var(--primary);
    text-align: center;
    font-size: 24px;
    opacity: .8;
}

.teaching-grid {
    display: grid;
    grid-template-columns: repeat(4,1fr);
    gap: 0;
}

.teaching-grid article {
    display: grid;
    grid-template-columns: 52px 1fr;
    gap: 10px;
    padding: 8px 18px;
    border-right: 1px solid var(--border);
}

.teaching-grid article:last-child { 
    border-right: 0; 
}

.feature-icon {
    width: 44px;
    height: 44px;
    display: grid;
    place-items: center;
    border-radius: 50%;
    background: var(--primary-light);
    color: var(--primary);
    font-size: 22px;
}

.teaching-grid h3 {
    margin: 0 0 4px;
    font: 700 15px Georgia,serif;
}

.teaching-grid p {
    margin: 0;
    font-size: 12px;
    color: var(--muted);
}


.research-card {
    overflow: hidden;
    background: white;
    border: 1px solid var(--border);
    border-radius: 8px;
}

.research-image { 
    height: 105px; 
}

.research-image.geo {
    background: linear-gradient(135deg,#2472d4,#dbe5ff);
}

.research-image.robot {
    background: linear-gradient(135deg,#292929,#b7bdc9);
}

.research-image.life {
    background: radial-gradient(circle,#f2d400 1px,#191919 2px,#191919 7px);
    background-size: 13px 13px;
}

.research-image.algo {
    background: radial-gradient(circle,#2dd4bf 2px,transparent 3px), #111827;
    background-size: 32px 32px;
}

.research-card h3 {
    margin: 10px 12px 3px;
    font: 700 14px Georgia,serif;
}

.research-card p {
    margin: 0 12px 13px;
    color: var(--muted);
    font-size: 11.5px;
}

.two-column {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 25px;
}

.news-list > div, .publication-list > div {
    display: grid;
    grid-template-columns: 100px 1fr;
    gap: 12px;
    padding: 8px 0;
    border-bottom: 1px solid var(--border);
    font-size: 12px;
}

.news-list p, .publication-list p {
    margin: 0;
}

time {
    color: var(--primary-dark);
    font-weight: 600;
}

.profiles {
    max-width: var(--max-width);
    margin: 0 auto;
    min-height: 76px;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 80px;
}

.profiles a {
    color: var(--text);
    font-size: 13px;
    font-weight: 600;
}

footer {
    background: var(--primary);
    color: white;
    min-height: 65px;
    padding: 0px max(25px, calc((100% - var(--max-width))/2));
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    margin-top: 0;
}

.subpage-banner {
    width: 100%;
    height: 180px;
    position: relative;
    overflow: hidden;

    background-image: url("../assets/thin-banner.png");
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center center;

    display: flex;
    align-items: center;
}

.subpage-banner-content {
    width: min(var(--max-width), 100%);
    margin: 0 auto;
    padding: 0 28px 0 42px;
    position: relative;
    z-index: 1;
}

.subpage-banner h1 {
    margin: 0;
    color: #282828;
    font: 700 clamp(30px, 3.5vw, 48px)/1 Georgia, serif;
    letter-spacing: -0.8px;
    text-shadow: 0 2px 8px rgba(23, 32, 63, .28);
}

.subpage-banner p {
    margin: 5px 0 0;
    color: rgba(40, 40, 40, 0.94);
    font-size: 14px;
    font-weight: 500;
    letter-spacing: .2px;
    text-shadow: 0 1px 5px rgba(23, 32, 63, .25);
}

@media (max-width: 900px) {
    .subpage-banner {
        height: 150px;
        background-position: center -11vw;
    }

    .subpage-banner-content {
        padding-left: 30px;
    }
}

@media (max-width: 650px) {
    .subpage-banner {
        height: 108px;
        background-position: center -11vw;
    }

    .subpage-banner-content {
        padding: 0 24px;
    }

    .subpage-banner h1 {
        font-size: 32px;
    }

    .subpage-banner p {
        font-size: 12px;
    }
}

@media (max-width: 900px) {

    .hero {
        background-position: center top;
    }

    .hero-copy {
        padding: 40px 30px;
    }

    .hero h1 {
        font-size: 32;
    }

    .hero h2 {
        font-size: 20px;
    }

    .university {
        font-size: 12px;
    }

    .areas {
        font-size: 10px;
    }
    
    footer {
        margin-top: 0;
    }
}


@media (max-width: 650px) {

    .hero {
        background-position: 65% top;
    }

    .hero-copy {
        padding: 35px 25px;
    }

    .hero h1 {
        font-size: 32px;
        letter-spacing: -1px;
    }

    .hero h2 {
        font-size: 16px;
    }

    .university {
        font-size: 12px;
    }

    .areas {
        font-size: 10px;
    }

    .buttons {
        gap: 8px;
    }

    .button {
        padding: 9px 15px;
        font-size: 13px;
    }

    footer {
        margin-top: 0;
    }
}

@media (max-width: 950px) {
    .course-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 600px) {
    .courses-section {
        padding: 10px 12px;
    }

    .section-main {
        padding: 16px;
    }

    .course-grid {
        grid-template-columns: 1fr;
    }
    
    footer {
        margin-top: 0;
    }
}