:root {
    --bg: #ffffff;
    --surface: #ffffff;
    --ink: #0f2f52;
    --muted: #284967;
    --line: #dbe6ee;
    --accent: #00274c;
    --max-width: 1080px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    padding-top: 5rem;
    background: var(--bg);
    color: var(--ink);
    font-family: "Roboto", "Segoe UI", sans-serif;
    line-height: 1.65;
    font-size: 18px;
}

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

a {
    color: inherit;
}

section[id] {
    scroll-margin-top: 6rem;
}

.site-header,
.section,
.site-footer {
    padding-left: 1.25rem;
    padding-right: 1.25rem;
}

.hero,
.section > *,
.site-footer {
    max-width: var(--max-width);
    margin: 0 auto;
}

.site-nav {
    position: fixed;
    top: 0.75rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 20;
    width: min(calc(100% - 2rem), var(--max-width));
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.9rem 1.1rem;
    background: rgba(255, 255, 255, 0.96);
    border: 1px solid var(--line);
    border-radius: 14px;
    backdrop-filter: blur(10px);
}

.brand {
    font-size: 0.92rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    color: var(--accent);
    text-decoration: none;
    text-transform: uppercase;
}

.nav-links {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.nav-links a {
    color: #234869;
    font-size: 1rem;
    text-decoration: none;
}

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

.hero {
    width: 100vw;
    max-width: none;
    margin-top: 0.75rem;
    margin-left: calc(50% - 50vw);
    margin-right: calc(50% - 50vw);
    padding:
        4.75rem
        max(1.5rem, calc((100vw - var(--max-width)) / 2 + 1.25rem))
        3rem;
    background:
        linear-gradient(180deg, rgba(17, 24, 33, 0.52), rgba(17, 24, 33, 0.76)),
        url("seoul.jpg") center 56% / cover no-repeat;
    border-radius: 0;
}

.hero-content {
    max-width: 60rem;
    padding: 1.8rem 1.9rem 1.6rem;
    background: linear-gradient(180deg, rgba(17, 24, 33, 0.72), rgba(17, 24, 33, 0.54));
    border: 1px solid rgba(255, 255, 255, 0.16);
    border-radius: 18px;
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.16);
    backdrop-filter: blur(5px);
}

.eyebrow {
    margin: 0 0 0.9rem;
    color: rgba(255, 255, 255, 0.9);
    font-size: 0.84rem;
    font-weight: 700;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}

h1,
h2,
h3 {
    margin: 0;
    line-height: 1.12;
    font-family: "Roboto", "Segoe UI", sans-serif;
    font-weight: 700;
}

h1 {
    max-width: 12ch;
    color: #ffffff;
    font-size: clamp(2.9rem, 7vw, 4.8rem);
}

.hero-subtitle {
    max-width: 32rem;
    margin: 1rem 0 1rem;
    color: #ffffff;
    font-size: clamp(1.12rem, 2.7vw, 1.55rem);
}

.hero-description {
    max-width: 42rem;
    margin: 0;
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.12rem;
}

.hero-meta-line,
.hero-question {
    max-width: 42rem;
    margin: 0.85rem 0 0;
    color: rgba(255, 255, 255, 0.96);
    font-size: 1.08rem;
}

.hero-meta-line-secondary {
    margin-top: 0.35rem;
    color: rgba(255, 255, 255, 0.82);
}

.hero-question-label {
    margin: 1.2rem 0 0;
    color: rgba(255, 255, 255, 0.82);
    font-size: 0.82rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 1.5rem;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 2.9rem;
    padding: 0.75rem 1.15rem;
    border: 1px solid transparent;
    border-radius: 999px;
    font-weight: 700;
    text-decoration: none;
}

.button-primary {
    background: #ffffff;
    color: var(--ink);
}

.button-secondary {
    border-color: rgba(255, 255, 255, 0.65);
    color: #ffffff;
}

.button-secondary:hover,
.button-secondary:focus-visible {
    background: rgba(255, 255, 255, 0.12);
}

.button-disabled {
    background: rgba(255, 255, 255, 0.22);
    border-color: rgba(255, 255, 255, 0.24);
    color: rgba(255, 255, 255, 0.72);
    cursor: not-allowed;
    pointer-events: none;
}

.section {
    max-width: var(--max-width);
    margin: 2rem auto 0;
    padding: 2.2rem 1.5rem 2.5rem;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: 0 10px 28px rgba(24, 33, 43, 0.05);
}

.section-alt::before {
    display: none;
}

.section-heading {
    margin-bottom: 1.5rem;
}

.section-heading h2 {
    font-size: clamp(2rem, 5vw, 2.9rem);
    color: var(--accent);
}

.section-intro {
    max-width: 42rem;
    margin: 0.9rem 0 0;
    color: var(--muted);
    font-size: 1.08rem;
}

.overview-grid,
.program-layout,
.contact-grid {
    display: grid;
    gap: 1rem;
    grid-template-columns: 1fr;
}

.lead-card {
    padding: 1.2rem;
    background: #ffffff;
    border: 1px solid var(--line);
    border-radius: 14px;
}

#topics .lead-card {
    margin-bottom: 1.5rem;
}

#topics .theme-grid {
    margin-top: 1.5rem;
}

.lead-card p,
.focus-card p,
.theme-card p,
.summary-card p,
.person-note,
.contact-card p {
    margin: 0;
    color: var(--muted);
    font-size: 1.03rem;
}

.lead-card p + p {
    margin-top: 1rem;
}

.focus-stack,
.theme-grid {
    display: grid;
    gap: 1rem;
    grid-template-columns: 1fr;
}

.focus-card,
.theme-card {
    padding: 1.1rem 1.2rem;
    background: #ffffff;
    border: 1px solid var(--line);
    border-radius: 14px;
}

.focus-card h3,
.theme-card h3,
.summary-card h3,
.contact-card h3 {
    margin-bottom: 0.45rem;
    font-size: 1.42rem;
    color: var(--accent);
}

.quote-band {
    max-width: 42rem;
    margin-top: 1.25rem;
    padding-left: 1rem;
    border-left: 3px solid var(--accent);
}

.quote-band p {
    margin: 0;
    color: var(--muted);
    font-size: 1.04rem;
}

.theme-index {
    display: block;
    margin-bottom: 0.4rem;
    color: var(--accent);
    font-size: 0.82rem;
    font-weight: 700;
    letter-spacing: 0.08em;
}

.summary-card,
.schedule-card,
.person-card,
.contact-card {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 14px;
    box-shadow: 0 8px 22px rgba(24, 33, 43, 0.04);
}

.summary-card,
.contact-card {
    padding: 1.2rem;
}

.summary-note {
    margin-top: 1rem;
}

.bullet-list,
.contact-list,
.schedule-list {
    margin: 0;
    padding: 0;
    list-style: none;
}

.bullet-list li,
.contact-list li {
    position: relative;
    padding-left: 1rem;
    color: var(--muted);
    font-size: 1.02rem;
}

.bullet-list li + li,
.contact-list li + li {
    margin-top: 0.65rem;
}

.bullet-list li::before,
.contact-list li::before {
    content: "";
    position: absolute;
    top: 0.72rem;
    left: 0;
    width: 0.38rem;
    height: 0.38rem;
    border-radius: 50%;
    background: var(--accent);
}

.schedule-card {
    padding: 1.2rem;
}

.schedule-column + .schedule-column {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--line);
}

.schedule-column h3 {
    margin-bottom: 0.7rem;
    font-size: 1.48rem;
    color: var(--accent);
}

.schedule-list li {
    display: grid;
    gap: 0.08rem;
    padding: 0.7rem 0;
    border-top: 1px solid #eceff3;
}

.schedule-list li:first-child {
    border-top: 0;
}

.schedule-list span {
    color: var(--accent);
    font-size: 0.98rem;
    font-weight: 700;
}

.schedule-list strong {
    font-size: 1.06rem;
}

.people-grid,
.organizers-grid {
    display: grid;
    gap: 1rem;
    grid-template-columns: 1fr;
}

.person-card {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 0.95rem;
    align-items: start;
    padding: 1rem;
}

.person-avatar {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 3.9rem;
    height: 3.9rem;
    border-radius: 12px;
    background: #eef4f8;
    color: var(--accent);
    font-weight: 700;
    overflow: hidden;
}

.person-avatar.photo {
    background: #eef2f6;
}

.person-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.person-body {
    display: grid;
    gap: 0.3rem;
}

.person-body h3 {
    font-size: 1.32rem;
    color: var(--accent);
}

.person-link {
    color: var(--accent);
    text-decoration: none;
    border-bottom: 1px solid transparent;
}

.person-link:hover,
.person-link:focus-visible {
    color: var(--accent);
    border-bottom-color: rgba(47, 111, 159, 0.35);
}

.topic-link {
    color: var(--accent);
    text-decoration-thickness: 0.08em;
    text-underline-offset: 0.16em;
}

.topic-link:hover,
.topic-link:focus-visible {
    color: var(--ink);
}

.person-role {
    margin: 0;
    color: var(--ink);
    font-weight: 700;
    font-size: 1.02rem;
}

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

.contact-list li {
    display: grid;
    gap: 0.15rem;
}

.contact-list strong {
    color: var(--ink);
}

.contact-list a {
    width: fit-content;
    color: var(--accent);
    text-decoration-thickness: 0.08em;
    text-underline-offset: 0.16em;
}

.site-footer {
    max-width: var(--max-width);
    margin: 0 auto;
    padding-top: 0.5rem;
    padding-bottom: 2.5rem;
    color: var(--muted);
    font-size: 0.94rem;
    border-top: 1px solid #edf1f5;
}

.site-footer p {
    margin: 0.25rem 0 0;
}

@media (max-width: 820px) {
    body {
        padding-top: 6.25rem;
    }

    .site-nav {
        align-items: flex-start;
        flex-direction: column;
    }

    .hero {
        padding: 4rem 1.5rem 2.5rem;
    }

    .hero-content {
        padding: 1.4rem 1.25rem 1.3rem;
    }

    .people-grid,
    .organizers-grid {
        grid-template-columns: 1fr;
    }

    h1 {
        max-width: none;
    }
}

@media (max-width: 640px) {
    .site-header,
    .section,
    .site-footer {
        padding-left: 1rem;
        padding-right: 1rem;
    }

    body {
        padding-top: 7rem;
    }

    .site-nav {
        width: calc(100% - 1rem);
    }

    .hero-actions {
        flex-direction: column;
    }

    .button {
        width: 100%;
    }

    .person-card {
        grid-template-columns: 1fr;
    }
}