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

:root {
    --background: #eaf3fb;
    --surface: rgba(255, 255, 255, 0.62);
    --surface-strong: rgba(255, 255, 255, 0.82);
    --border: rgba(58, 95, 130, 0.18);
    --text: #172535;
    --muted: #607386;
    --accent: #476f9e;
    --accent-light: #789bc2;
    --shadow: 0 20px 55px rgba(49, 82, 111, 0.10);
}

html {
    scroll-behavior: smooth;
}

body {
    min-height: 100vh;
    overflow-x: hidden;
    background: var(--background);
    color: var(--text);
    font-family: Georgia, "Times New Roman", serif;
}

/* Fixed background */

.background {
    position: fixed;
    inset: 0;
    z-index: 0;
    overflow: hidden;
    pointer-events: none;
    background:
        radial-gradient(ellipse at 15% 20%, rgba(129,177,219,.35), transparent 35%),
        radial-gradient(ellipse at 85% 75%, rgba(143,157,219,.25), transparent 38%),
        linear-gradient(135deg, #edf6fc, #e5eff9);
}

.orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(3px);
    animation: orbFloat 20s ease-in-out infinite alternate;
}

.orb-one {
    width: 420px;
    height: 420px;
    top: -160px;
    right: -100px;
    background: radial-gradient(circle, rgba(112,163,211,.35), transparent 70%);
}

.orb-two {
    width: 380px;
    height: 380px;
    bottom: -140px;
    left: -100px;
    background: radial-gradient(circle, rgba(128,139,211,.28), transparent 70%);
    animation-delay: -7s;
}

.orb-three {
    width: 260px;
    height: 260px;
    top: 42%;
    left: 45%;
    background: radial-gradient(circle, rgba(255,255,255,.7), transparent 70%);
    animation-duration: 27s;
}

@keyframes orbFloat {
    from { transform: translate(-12px, -10px) scale(1); }
    to { transform: translate(20px, 18px) scale(1.08); }
}

.grid {
    position: absolute;
    inset: 0;
    opacity: .25;
    background-image:
        linear-gradient(rgba(71,111,158,.08) 1px, transparent 1px),
        linear-gradient(90deg, rgba(71,111,158,.08) 1px, transparent 1px);
    background-size: 80px 80px;
}

.background-lines {
    position: absolute;
    width: 115%;
    height: 100%;
    left: -7%;
    opacity: .35;
}

.background-lines path {
    fill: none;
    stroke: rgba(71,111,158,.20);
    stroke-width: 1.2;
    animation: lineMove 25s ease-in-out infinite alternate;
}

.background-lines path:nth-child(2) {
    stroke: rgba(110,125,185,.16);
    animation-duration: 32s;
    animation-direction: alternate-reverse;
}

@keyframes lineMove {
    from { transform: translateX(-2%); }
    to { transform: translateX(4%); }
}

/* Main layout */

.page {
    position: relative;
    z-index: 1;
    width: min(1100px, 90%);
    margin: auto;
    padding: 35px 0 40px;
}

.hero {
    min-height: 720px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.back {
    position: absolute;
    top: 35px;
    left: 0;
    color: var(--muted);
    font: 12px Arial, sans-serif;
    letter-spacing: 1px;
    text-decoration: none;
    transition: color .3s, transform .3s;
}

.back:hover {
    color: var(--accent);
    transform: translateX(-3px);
}

.hero-content {
    max-width: 720px;
    animation: appear 1s ease both;
}

.eyebrow {
    margin-bottom: 24px;
    color: var(--accent);
    font: 11px Arial, sans-serif;
    letter-spacing: 5px;
}

.hero h1 {
    font-size: clamp(58px, 10vw, 105px);
    font-weight: normal;
    line-height: .98;
    letter-spacing: -3px;
}

.hero h1 span {
    color: var(--accent);
    font-style: italic;
}

.hero-text {
    max-width: 530px;
    margin-top: 32px;
    color: var(--muted);
    font: 16px/1.8 Arial, sans-serif;
}

@keyframes appear {
    from { opacity: 0; transform: translateY(25px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Sections */

section {
    margin-bottom: 110px;
}

.section-label {
    margin-bottom: 22px;
    color: var(--accent);
    font: 10px Arial, sans-serif;
    letter-spacing: 4px;
}

.intro-card,
.featured-card,
.question-card,
.hypothesis-card,
.closing {
    border: 1px solid var(--border);
    border-radius: 9px;
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    box-shadow: var(--shadow);
}

.floating {
    animation: contentFloat 8s ease-in-out infinite;
}

@keyframes contentFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-5px); }
}

/* About */

.intro-card {
    max-width: 780px;
    padding: 42px;
    background: var(--surface);
}

.intro-card p {
    margin-bottom: 18px;
    font-size: 22px;
    line-height: 1.65;
}

.intro-card p:last-child {
    margin-bottom: 0;
    color: var(--muted);
    font: 15px/1.9 Arial, sans-serif;
}

/* Featured project */

.featured-card {
    position: relative;
    display: grid;
    grid-template-columns: 65px 1fr;
    gap: 25px;
    padding: 48px;
    overflow: hidden;
    background: var(--surface-strong);
}

.featured-card::before {
    content: "";
    position: absolute;
    inset: 0 auto 0 0;
    width: 3px;
    background: linear-gradient(transparent, var(--accent), transparent);
}

.project-number,
.question-number {
    color: var(--accent-light);
    font: 12px Arial, sans-serif;
    letter-spacing: 2px;
}

.project-type,
.question-type {
    margin-bottom: 14px;
    color: var(--accent);
    font: 10px Arial, sans-serif;
    letter-spacing: 2px;
}

.featured-content h2 {
    font-size: clamp(38px, 6vw, 62px);
    font-weight: normal;
    line-height: 1.05;
}

.featured-content h3 {
    margin-top: 8px;
    color: var(--muted);
    font-size: clamp(20px, 3vw, 28px);
    font-weight: normal;
    font-style: italic;
}

.project-description {
    max-width: 620px;
    margin-top: 25px;
    color: var(--muted);
    font: 15px/1.9 Arial, sans-serif;
}

.explore-button {
    margin-top: 28px;
    padding: 13px 19px;
    border: 1px solid rgba(71,111,158,.35);
    border-radius: 3px;
    background: rgba(255,255,255,.5);
    color: var(--accent);
    font: 11px Arial, sans-serif;
    letter-spacing: 1.5px;
    cursor: pointer;
    transition: background .3s, transform .3s;
}

.explore-button span {
    display: inline-block;
    margin-left: 12px;
    transition: transform .3s;
}

.explore-button:hover {
    background: white;
    transform: translateY(-2px);
}

.explore-button:hover span {
    transform: translateX(4px);
}

/* Other questions */

.question-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 17px;
}

.question-card {
    min-height: 300px;
    padding: 28px;
    display: flex;
    flex-direction: column;
    background: rgba(255,255,255,.44);
    transition: background .3s, border-color .3s, box-shadow .3s;
}

.question-card:nth-child(2) {
    animation-delay: -2s;
}

.question-card:nth-child(3) {
    animation-delay: -4s;
}

.question-card:hover {
    background: rgba(255,255,255,.75);
    border-color: rgba(71,111,158,.32);
    box-shadow: 0 24px 55px rgba(49,82,111,.14);
}

.question-type {
    margin-top: 30px;
    font-size: 9px;
}

.question-card h2 {
    font-size: 26px;
    font-weight: normal;
    line-height: 1.25;
}

.question-card > p:not(.question-type) {
    margin-top: 14px;
    color: var(--muted);
    font: 13px/1.8 Arial, sans-serif;
}

.status {
    margin-top: auto;
    padding-top: 25px;
    color: var(--accent-light);
    font: 9px Arial, sans-serif;
    letter-spacing: 2px;
}

/* Original hypotheses */

.section-heading {
    max-width: 650px;
    margin-bottom: 28px;
}

.section-heading h2 {
    margin: 12px 0;
    font-size: clamp(34px, 5vw, 52px);
    font-weight: normal;
}

.section-heading > p:last-child {
    color: var(--muted);
    font: 14px/1.8 Arial, sans-serif;
}

.hypothesis-card {
    position: relative;
    display: block;
    padding: 38px;
    color: inherit;
    text-decoration: none;
    background: linear-gradient(125deg, rgba(255,255,255,.85), rgba(222,236,250,.72));
    transition: transform .35s, box-shadow .35s, border-color .35s;
}

.hypothesis-card:hover {
    transform: translateY(-6px);
    border-color: rgba(71,111,158,.42);
    box-shadow: 0 28px 65px rgba(49,82,111,.17);
}

.hypothesis-topline {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    color: var(--accent);
    font: 9px/1.6 Arial, sans-serif;
    letter-spacing: 1.5px;
}

.hypothesis-arrow {
    font-size: 22px;
    transition: transform .3s;
}

.hypothesis-card:hover .hypothesis-arrow {
    transform: translate(3px, -3px);
}

.hypothesis-card h3 {
    margin-top: 28px;
    font-size: clamp(29px, 5vw, 43px);
    font-weight: normal;
}

.hypothesis-subtitle {
    margin-top: 8px;
    color: var(--accent);
    font-style: italic;
    line-height: 1.6;
}

.hypothesis-description {
    max-width: 700px;
    margin-top: 22px;
    color: var(--muted);
    font: 14px/1.9 Arial, sans-serif;
}

.read-link {
    display: inline-block;
    margin-top: 28px;
    color: var(--accent);
    font: 10px Arial, sans-serif;
    letter-spacing: 2px;
}

/* Closing and footer */

.closing {
    padding: 65px 30px;
    text-align: center;
    background: rgba(255,255,255,.3);
}

.closing-mark {
    margin-bottom: 20px;
    color: var(--accent);
    font-size: 52px;
    font-style: italic;
}

.closing h2 {
    max-width: 650px;
    margin: auto;
    font-size: clamp(27px, 5vw, 45px);
    font-weight: normal;
    line-height: 1.3;
}

.closing > p:last-child {
    margin-top: 22px;
    color: var(--muted);
    font: 12px Arial, sans-serif;
}

footer {
    display: flex;
    justify-content: space-between;
    gap: 15px;
    padding-top: 25px;
    border-top: 1px solid var(--border);
    color: var(--muted);
    font: 10px Arial, sans-serif;
    letter-spacing: 1px;
}

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

footer a:hover {
    color: var(--accent);
}

/* Mobile */

@media (max-width: 750px) {
    .page { width: 92%; }
    .hero { min-height: 620px; }
    .featured-card {
        grid-template-columns: 1fr;
        gap: 18px;
        padding: 35px 28px;
    }
    .question-grid { grid-template-columns: 1fr; }
    .question-card { min-height: 250px; }
    .intro-card { padding: 28px; }
    .intro-card p { font-size: 19px; }
    .hypothesis-card { padding: 28px; }
    section { margin-bottom: 85px; }
}

@media (max-width: 450px) {
    .hero { min-height: 560px; }
    .hero h1 { font-size: 54px; letter-spacing: -2px; }
    .hero-text { font-size: 14px; }
    .featured-card { padding: 28px 22px; }
    .hypothesis-topline { align-items: flex-start; }
    footer { flex-direction: column; }
}

/* Accessibility */

a:focus-visible,
button:focus-visible {
    outline: 3px solid var(--accent);
    outline-offset: 5px;
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation: none !important;
        scroll-behavior: auto !important;
        transition-duration: .01ms !important;
    }
}