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

:root {
    --color-bg: #ffffff;
    --color-bg-alt: #f6f8fb;
    --color-text: #1a1a2e;
    --color-text-secondary: #4a5568;
    --color-accent: #2b6cb0;
    --color-accent-dark: #1e4e8c;
    --color-accent-light: #ebf4ff;
    --color-border: #e2e8f0;
    --font-serif: 'Source Serif 4', Georgia, serif;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --max-width: 1100px;
    --narrow-width: 780px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-serif);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.7;
    font-size: 17px;
    -webkit-font-smoothing: antialiased;
}

/* ===== Layout ===== */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.narrow {
    max-width: var(--narrow-width);
}

/* ===== Hero / Header ===== */
.hero {
    text-align: center;
    padding: 72px 24px 56px;
    background: linear-gradient(165deg, #f0f5ff 0%, #ffffff 50%, #f7f0ff 100%);
    border-bottom: 1px solid var(--color-border);
}

.hero .venue {
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: 14px;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: 20px;
}

.hero h1 {
    font-size: clamp(28px, 4vw, 44px);
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-text);
    margin-bottom: 28px;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.authors {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 8px 28px;
    margin-bottom: 8px;
}

.author {
    font-family: var(--font-sans);
    font-size: 17px;
    font-weight: 500;
    color: var(--color-text);
}

.author a {
    color: var(--color-accent);
    text-decoration: none;
}

.author a:hover {
    text-decoration: underline;
}

.affiliation {
    font-family: var(--font-sans);
    font-size: 15px;
    color: var(--color-text-secondary);
    margin-bottom: 28px;
}

.links {
    display: flex;
    justify-content: center;
    gap: 14px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-sans);
    font-size: 15px;
    font-weight: 500;
    padding: 10px 22px;
    border-radius: 8px;
    text-decoration: none;
    transition: all 0.2s ease;
    background: var(--color-accent);
    color: #fff;
}

.btn-logo {
    height: 16px;
    width: auto;
    vertical-align: middle;
}

.btn:hover {
    background: var(--color-accent-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(43, 108, 176, 0.3);
}

.btn-outline {
    background: transparent;
    color: var(--color-accent);
    border: 1.5px solid var(--color-accent);
}

.btn-outline:hover {
    background: var(--color-accent-light);
    color: var(--color-accent-dark);
    box-shadow: none;
    transform: translateY(-1px);
}

/* ===== Teaser ===== */
.teaser {
    padding: 28px 24px 48px;
    background: var(--color-bg);
}

.teaser figure {
    max-width: var(--max-width);
    margin: 0 auto;
}

.teaser img {
    width: 100%;
    border-radius: 8px;
}

.teaser figcaption {
    font-size: 16.5px;
    color: var(--color-text-secondary);
    margin-top: 24px;
    line-height: 1.6;
    text-align: left;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

/* ===== Sections ===== */
.section {
    padding: 36px 24px;
}

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

.section h2 {
    font-size: 30px;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--color-text);
    text-align: center;
}

.section h3 {
    font-size: 22px;
    font-weight: 600;
    margin-top: 40px;
    margin-bottom: 20px;
    color: var(--color-text);
    text-align: center;
}

.section p {
    color: var(--color-text-secondary);
    margin-bottom: 16px;
}

.section-intro {
    text-align: left;
    font-size: 18px;
    margin-bottom: 32px !important;
}

/* ===== Contribution Cards ===== */
.contributions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
    margin-top: 12px;
}

.contribution-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 32px 24px;
    text-align: center;
    transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.contribution-card:hover {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
    transform: translateY(-2px);
}

.card-icon {
    font-size: 28px;
    color: var(--color-accent);
    margin-bottom: 16px;
}

.contribution-card h3 {
    font-family: var(--font-sans);
    font-size: 17px;
    font-weight: 600;
    color: var(--color-text);
    margin-top: 0;
    margin-bottom: 10px;
    text-align: center;
}

.contribution-card p {
    font-size: 15px;
    line-height: 1.6;
    margin-bottom: 0;
}

/* ===== Method Section ===== */
.method-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: start;
    max-width: var(--max-width);
    margin: 0 auto;
}

.method-text p {
    font-size: 16px;
}

.method-figure {
    margin: 0;
}

.method-figure img {
    width: 100%;
    border-radius: 8px;
    box-shadow: 0 2px 16px rgba(0, 0, 0, 0.06);
}

.method-figure figcaption {
    font-size: 14px;
    color: var(--color-text-secondary);
    margin-top: 12px;
    line-height: 1.5;
}

/* ===== Results Figures ===== */
.results-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    margin: 24px auto;
    max-width: 720px;
}

.results-row.triple {
    grid-template-columns: 1fr 1fr 1fr;
    max-width: 960px;
}

.results-row figure {
    margin: 0;
    text-align: center;
}

.results-row img {
    width: 100%;
    border-radius: 6px;
    box-shadow: 0 1px 8px rgba(0, 0, 0, 0.06);
    background: white;
    padding: 4px;
}

.results-row figcaption {
    font-family: var(--font-sans);
    font-size: 13px;
    color: var(--color-text-secondary);
    margin-top: 10px;
}

.results-note {
    text-align: center;
    max-width: var(--narrow-width);
    margin: 8px auto 0 !important;
    font-size: 16px;
}

/* ===== Wide Figures ===== */
.wide-figure {
    text-align: center;
    margin: 32px auto;
    max-width: var(--max-width);
}

.wide-figure img {
    max-width: 85%;
    border-radius: 8px;
}

.wide-figure figcaption {
    font-size: 15px;
    color: var(--color-text-secondary);
    margin-top: 16px;
    line-height: 1.6;
    text-align: left;
    max-width: var(--narrow-width);
    margin-left: auto;
    margin-right: auto;
}

/* ===== Overlay Figure ===== */
.overlay-figure {
    position: relative;
}

.overlay-caption {
    position: absolute;
    bottom: -1.2%;
    left: 10%;
    max-width: 31% !important;
    margin: 0 !important;
    font-size: 14px !important;
    line-height: 1.5;
    color: var(--color-text-secondary);
    text-align: left;
}

/* ===== BibTeX ===== */
.bibtex {
    background: #1a1a2e;
    color: #e2e8f0;
    padding: 24px 28px;
    border-radius: 10px;
    overflow-x: auto;
    font-size: 14px;
    line-height: 1.7;
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    position: relative;
}

.bibtex code {
    font-family: inherit;
}

/* ===== Footer ===== */
footer {
    text-align: center;
    padding: 40px 24px;
    border-top: 1px solid var(--color-border);
}

footer p {
    font-family: var(--font-sans);
    font-size: 14px;
    color: var(--color-text-secondary);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .method-content {
        grid-template-columns: 1fr;
    }

    .results-row.triple {
        grid-template-columns: 1fr;
        max-width: 400px;
    }

    .results-row {
        grid-template-columns: 1fr;
        max-width: 400px;
    }

    .hero {
        padding: 48px 20px 40px;
    }

    .section {
        padding: 48px 16px;
    }

    .hero h1 {
        font-size: 26px;
    }
}