:root {
    --maroon: #580c1f;
    --maroon-deep: #3d0815;
    --maroon-soft: #7a1a32;
    --gold: #b88e4f;
    --gold-light: #d4b57a;
    --cream: #f9f3e6;
    --paper: #fffdf8;
    --ink: #2b1a1d;
    --muted: #6d5a5e;
    --line: rgba(88, 12, 31, 0.12);
    --shadow: 0 18px 50px rgba(61, 8, 21, 0.18);
    --radius: 18px;
    --max: 1100px;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    color: var(--ink);
    font-family: "Open Sans", "Segoe UI", sans-serif;
    background:
        linear-gradient(180deg, rgba(61, 8, 21, 0.86), rgba(61, 8, 21, 0.94)),
        url("../images/banner.png") center top / cover no-repeat fixed;
    min-height: 100vh;
}

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

a {
    color: inherit;
}

.page {
    width: min(var(--max), calc(100% - 32px));
    margin: 0 auto;
    padding: 28px 0 64px;
}

.hero,
.section-card {
    background: var(--paper);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.hero {
    margin-bottom: 28px;
}

.hero img {
    width: 100%;
    display: block;
}

.section-card {
    padding: 36px 32px 40px;
    margin-bottom: 28px;
}

.section-title {
    margin: 0 0 8px;
    text-align: center;
    font-size: clamp(1.45rem, 2.4vw, 2rem);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--maroon);
}

.section-subtitle {
    margin: 0 auto 28px;
    max-width: 720px;
    text-align: center;
    color: var(--muted);
    font-size: 0.98rem;
}

.day-nav,
.room-nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin-bottom: 22px;
}

.day-btn,
.room-btn {
    appearance: none;
    border: 1px solid var(--line);
    background: #fff;
    color: var(--maroon);
    cursor: pointer;
    border-radius: 999px;
    padding: 10px 18px;
    font: inherit;
    font-weight: 700;
    transition: 0.2s ease;
}

.day-btn small {
    display: block;
    font-weight: 500;
    font-size: 0.72rem;
    color: var(--muted);
}

.day-btn.is-active,
.room-btn.is-active {
    background: var(--maroon);
    border-color: var(--maroon);
    color: #fff;
}

.day-btn.is-active small {
    color: var(--gold-light);
}

.day-panel,
.room-panel {
    display: none;
}

.day-panel.is-active,
.room-panel.is-active {
    display: block;
}

.room-meta {
    text-align: center;
    margin: 0 0 24px;
}

.room-meta h3 {
    margin: 0 0 6px;
    color: var(--maroon);
    font-size: 1.15rem;
}

.room-meta p {
    margin: 0;
    color: var(--muted);
}

.timeline {
    display: grid;
    gap: 14px;
}

.block {
    border: 1px solid var(--line);
    border-radius: 14px;
    overflow: hidden;
    background: #fff;
}

.block-head {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 16px;
    align-items: baseline;
    padding: 14px 16px;
    background: var(--cream);
    border-bottom: 1px solid var(--line);
}

.block-time {
    font-weight: 700;
    color: var(--gold);
    white-space: nowrap;
}

.block-title {
    margin: 0;
    font-size: 1rem;
    color: var(--maroon);
}

.block-body {
    padding: 14px 16px 16px;
}

.equipe {
    margin: 0 0 12px;
    padding: 0;
    list-style: none;
    color: var(--muted);
    font-size: 0.92rem;
}

.talks {
    margin: 0;
    padding: 0;
    list-style: none;
    display: grid;
    gap: 10px;
}

.talk {
    display: grid;
    grid-template-columns: 130px 1fr;
    gap: 12px;
    padding: 10px 0;
    border-top: 1px dashed var(--line);
}

.talk:first-child {
    border-top: 0;
    padding-top: 0;
}

.talk-time {
    font-weight: 700;
    color: var(--maroon-soft);
    font-size: 0.88rem;
}

.talk-title {
    margin: 0 0 4px;
    font-weight: 700;
}

.talk-speaker {
    margin: 0;
    color: var(--muted);
    font-size: 0.9rem;
}

.block.is-break {
    background: transparent;
    border-style: dashed;
}

.block.is-break .block-head {
    background: rgba(249, 243, 230, 0.55);
    border-bottom: 0;
}

.block.is-highlight .block-head {
    background: var(--maroon);
}

.block.is-highlight .block-time,
.block.is-highlight .block-title {
    color: #fff;
}

.block.is-highlight .block-title {
    color: var(--gold-light);
}

.partners img {
    width: min(100%, 920px);
    margin: 0 auto;
}

.footer {
    text-align: center;
    color: rgba(255, 255, 255, 0.72);
    font-size: 0.85rem;
}

@media (max-width: 720px) {
    .page {
        width: min(100% - 16px, var(--max));
        padding-top: 14px;
    }

    .section-card {
        padding: 24px 14px 28px;
        border-radius: 14px;
    }

    .hero,
    .section-card {
        border-radius: 14px;
    }

    .talk {
        grid-template-columns: 1fr;
        gap: 4px;
    }

    .day-btn,
    .room-btn {
        flex: 1 1 calc(50% - 10px);
    }
}

@media (max-width: 480px) {
    .day-btn,
    .room-btn {
        flex-basis: 100%;
    }
}