/* ==========================================================================
   Talks — list
   ========================================================================== */

.talks__intro {
    max-width: 520px;
}

.talks {
    margin: 64px auto 160px;
}

.talks-grid {
    display: grid;
    gap: 8px;
}

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

.talks-grid--2 {
    grid-template-columns: 1fr 1fr;
}

.talks-grid--3plus {
    grid-template-columns: repeat(3, 1fr);
}

.talks-grid--1 .talk-card {
    aspect-ratio: 2.8 / 1;
}

.talk-card {
    display: block;
    position: relative;
    overflow: hidden;
    background-color: var(--card-color);
    aspect-ratio: 1.6 / 1;
    text-decoration: none;
    color: var(--text-primary);
}

.talk-card__content {
    position: absolute;
    bottom: 20px;
    left: 20px;
    right: 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.talk-card__title {
    font-size: 16px;
    font-weight: 400;
    color: var(--text-primary);
    line-height: 1.3;
}

.talk-card__meta {
    display: flex;
    flex-wrap: wrap;
    gap: 6px 12px;
    font-size: 12px;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-muted);
}

.talk-card--ongoing .talk-card__format {
    color: var(--text-primary);
}

@media (max-width: 768px) {
    .talks {
        margin: 32px auto 80px;
    }

    .talks-grid--2,
    .talks-grid--3plus {
        grid-template-columns: 1fr;
    }

    .talk-card {
        aspect-ratio: 2 / 1;
    }

    .talks-grid--1 .talk-card {
        aspect-ratio: 2 / 1;
    }
}

/* ==========================================================================
   Single Talk — 2-col layout (mirrors single blog post)
   ========================================================================== */

.talk-post {
    --post-sticky-offset: 60px;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 60px 0;
    display: grid;
    grid-template-columns: 340px minmax(0, 1fr);
    gap: 48px;
}

.talk-post--centered {
    display: block;
    max-width: 820px;
    padding: 60px 0 80px;
}

.talk-post--centered .talk-post__header {
    position: static;
    text-align: center;
    margin-bottom: 48px;
}

.talk-post--centered .talk-post__title {
    font-size: clamp(32px, 4vw, 56px);
    margin: 0 0 20px;
}

.talk-post--centered .talk-post__meta {
    justify-content: center;
    margin-bottom: 28px;
}

.talk-post--centered .talk-post__description {
    text-align: left;
    max-width: 640px;
    margin: 0 auto 28px;
}

.talk-post--centered .talk-post__all {
    display: inline-block;
}

.talk-post--centered .talk-post__content {
    justify-self: stretch;
    width: 100%;
}

@media (min-width: 1100px) {
    .talk-post {
        grid-template-columns: 400px minmax(0, 1fr);
    }
}

@media (min-width: 1400px) {
    .talk-post {
        grid-template-columns: 480px minmax(0, 1fr);
    }
}

.talk-post__header {
    position: sticky;
    top: var(--post-sticky-offset, 60px);
    align-self: start;
}

.talk-post__tag {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 11px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.talk-post__format-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--text-primary);
    position: relative;
}

.talk-post__format-dot--ongoing {
    background: transparent;
    border: 1px solid var(--text-primary);
}

.talk-post__format-dot--ongoing::after {
    content: '';
    position: absolute;
    inset: -3px;
    border: 1px solid var(--text-primary);
    border-radius: 50%;
    opacity: 0;
    animation: talk-pulse 2.4s ease-out infinite;
}

@keyframes talk-pulse {
    0%   { transform: scale(1);   opacity: 0.6; }
    100% { transform: scale(2.2); opacity: 0; }
}

.talk-post__title {
    font-size: 42px;
    font-weight: 400;
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin: 0 0 16px;
    color: var(--text-primary);
}

.talk-post__meta {
    list-style: none;
    margin: 0 0 24px;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    font-size: 15px;
    color: var(--text-muted);
}

.talk-post__meta-item {
    position: relative;
}

.talk-post__meta-item + .talk-post__meta-item::before {
    content: "·";
    margin-right: 8px;
    color: var(--text-muted);
}

.talk-post__description {
    font-size: 15px;
    line-height: 1.7;
    color: var(--text-secondary);
    margin-bottom: 28px;
}

.talk-post__description p {
    margin: 0 0 12px;
}

.talk-post__description p:last-child {
    margin-bottom: 0;
}

.talk-post__all {
    display: inline-block;
    font-size: 14px;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s ease;
    margin-bottom: 24px;
}

.talk-post__all:hover {
    color: var(--text-primary);
}

.talk-post__content {
    max-width: 100%;
    justify-self: end;
    width: 100%;
}

.talk-post__empty {
    font-size: 16px;
    color: var(--text-muted);
    font-style: italic;
}

/* ==========================================================================
   Sessions — accordion
   ========================================================================== */

.sessions-accordion {
    list-style: none;
    margin: 0;
    padding: 0;
}

.session-item {
    border-top: 1px solid var(--ring-color);
}

.session-item:last-child {
    border-bottom: 1px solid var(--ring-color);
}

.session-accordion {
    padding: 0;
}

.session-accordion[open] {
    padding-bottom: 8px;
}

.session-accordion__summary {
    display: grid;
    grid-template-columns: 52px 1fr auto 24px;
    gap: 20px;
    align-items: center;
    padding: 24px 0;
    cursor: pointer;
    list-style: none;
    position: relative;
    transition: padding 0.35s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.session-accordion__summary::-webkit-details-marker {
    display: none;
}

.session-accordion__summary:hover {
    padding-left: 8px;
}

.session-accordion__index {
    font-size: 12px;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    font-variant-numeric: tabular-nums;
}

.session-accordion__title {
    font-size: clamp(20px, 2vw, 26px);
    font-weight: 400;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    line-height: 1.2;
}

.session-accordion__date {
    font-size: 12px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-muted);
    white-space: nowrap;
}

.session-accordion__chevron {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    color: var(--text-muted);
    transition: transform 0.35s cubic-bezier(0.2, 0.8, 0.2, 1), color 0.2s ease;
}

.session-accordion[open] .session-accordion__chevron {
    transform: rotate(180deg);
    color: var(--text-primary);
}

.session-accordion__summary:hover .session-accordion__chevron {
    color: var(--text-primary);
}

/* Smooth open/close animation using ::details-content (modern browsers) */
:root {
    interpolate-size: allow-keywords;
}

.session-accordion::details-content {
    block-size: 0;
    opacity: 0;
    overflow: clip;
    transition:
        block-size 0.45s cubic-bezier(0.2, 0.8, 0.2, 1),
        opacity 0.35s ease,
        content-visibility 0.45s allow-discrete;
}

.session-accordion[open]::details-content {
    block-size: auto;
    opacity: 1;
}

/* Fallback for browsers without ::details-content support */
@supports not selector(::details-content) {
    .session-accordion[open] .session-accordion__body {
        animation: session-reveal 0.45s cubic-bezier(0.2, 0.8, 0.2, 1);
    }

    @keyframes session-reveal {
        from { opacity: 0; transform: translateY(-6px); }
        to   { opacity: 1; transform: translateY(0); }
    }
}

.session-accordion__body {
    padding: 4px 0 32px 72px;
    max-width: 780px;
}

.session-accordion__content {
    font-size: 16px;
    line-height: 1.75;
    color: var(--text-secondary);
    margin-bottom: 28px;
}

.session-accordion__content p {
    margin-bottom: 14px;
}

.session-accordion__content p:last-child {
    margin-bottom: 0;
}

.session-accordion__content a {
    color: var(--text-primary);
    text-decoration: underline;
    text-underline-offset: 2px;
    text-decoration-color: var(--ring-color);
}

.session-accordion__resources {
    margin-top: 20px;
}

.resources-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 8px 20px;
}

.resource__link {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 6px 0;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 15px;
}

.resource__icon {
    font-size: 13px;
    color: var(--text-muted);
    transition: transform 0.4s cubic-bezier(0.2, 0.8, 0.2, 1), color 0.2s ease;
}

.resource__link:hover .resource__icon {
    transform: translate(4px, -4px);
    color: var(--text-primary);
}

/* ==========================================================================
   Single Talk — one-off content (featured image + resources reuse)
   ========================================================================== */

.talk-post__description--in-content {
    max-width: 720px;
    font-size: 16px;
    line-height: 1.75;
    margin-bottom: 40px;
}

.talk-post__media {
    margin: 0 0 32px;
    overflow: hidden;
    background: var(--card-color);
}

.talk-post__media-img {
    display: block;
    width: 100%;
    height: auto;
    aspect-ratio: 16 / 10;
    object-fit: cover;
}

a.session-accordion__summary--link {
    text-decoration: none;
    color: inherit;
}

.session-accordion__summary--link .session-accordion__chevron {
    display: none;
}

.session-accordion__summary--link:hover .session-accordion__chevron {
    transform: translate(3px, -3px);
    color: var(--text-primary);
}

@media (max-width: 900px) {
    .talk-post {
        grid-template-columns: 1fr;
        padding: 40px 0;
        gap: 24px;
    }

    .talk-post__header {
        position: static;
        margin-bottom: 8px;
    }

    .talk-post__title {
        font-size: 32px;
    }
}

@media (max-width: 640px) {
    .session-accordion__summary {
        grid-template-columns: 36px 1fr 20px;
        gap: 14px;
        padding: 20px 0;
    }

    .session-accordion__date {
        grid-column: 2;
        grid-row: 2;
        margin-top: 4px;
        font-size: 11px;
    }

    .session-accordion__body {
        padding-left: 50px;
        padding-bottom: 24px;
    }

    .talk-post__title {
        font-size: 28px;
    }
}