/* ============================================
   Lectures Page — Warm Manuscript Aesthetic
   ============================================ */

/* ---- Hero ---- */
.lectures-hero {
    position: relative;
    padding: 5rem 0 4rem;
    overflow: hidden;
    text-align: center;
    color: var(--white);
}

.lectures-hero-bg {
    position: absolute;
    inset: 0;
    background:
        linear-gradient(160deg, #3d1e08 0%, #5c2e10 35%, #7a3b12 60%, #4a2209 100%);
    z-index: -2;
}

.hero-grain {
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.06'/%3E%3C/svg%3E");
    opacity: 0.5;
    z-index: -1;
}

.hero-gradient {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 70% 50% at 50% 0%, rgba(255,153,51,0.18) 0%, transparent 100%),
        radial-gradient(ellipse 40% 60% at 80% 100%, rgba(255,215,0,0.08) 0%, transparent 100%);
    z-index: -1;
}

.lectures-hero-content {
    position: relative;
    max-width: 780px;
    margin: 0 auto;
}

.hero-eyebrow {
    font-family: 'Cormorant Garamond', 'Georgia', serif;
    font-size: 1.05rem;
    font-weight: 600;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: rgba(255,215,0,0.85);
    margin-bottom: 1.5rem;
}

.lectures-hero-title {
    margin-bottom: 1.5rem;
}

.title-sanskrit {
    display: block;
    font-family: 'Noto Sans Devanagari', sans-serif;
    font-size: 4.5rem;
    font-weight: 700;
    line-height: 1;
    color: rgba(255,215,0,0.22);
    margin-bottom: 0.5rem;
    letter-spacing: 0.08em;
    user-select: none;
}

.title-english {
    display: block;
    font-family: 'Cormorant Garamond', 'Georgia', serif;
    font-size: 2.4rem;
    font-weight: 700;
    line-height: 1.25;
    color: #fff;
    text-shadow: 0 2px 20px rgba(0,0,0,0.3);
}

.lectures-hero-sub {
    font-family: 'Cormorant Garamond', 'Georgia', serif;
    font-size: 1.2rem;
    font-style: italic;
    color: rgba(255,255,255,0.8);
    margin-bottom: 2rem;
}

.hero-meta {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.meta-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 1.1rem;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,215,0,0.25);
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 500;
    color: rgba(255,255,255,0.9);
    backdrop-filter: blur(4px);
}

.meta-pill svg {
    opacity: 0.75;
}

/* PDF Buttons */
.hero-cta {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 2rem;
}

.pdf-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.85rem 1.8rem;
    border-radius: 50px;
    font-family: 'Poppins', sans-serif;
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    min-height: 48px;
    cursor: pointer;
}

.pdf-btn-view {
    background: rgba(255,255,255,0.15);
    color: var(--white);
    border: 2px solid rgba(255,215,0,0.4);
    backdrop-filter: blur(4px);
}

.pdf-btn-view:hover {
    background: rgba(255,255,255,0.25);
    border-color: rgba(255,215,0,0.7);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.25);
}

.pdf-btn-download {
    background: linear-gradient(135deg, var(--gold), var(--saffron));
    color: #3d1e08;
    border: 2px solid transparent;
}

.pdf-btn-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(255,153,51,0.4);
    filter: brightness(1.08);
}

/* ---- Year Selector ---- */
.year-selector-section {
    padding: 1.25rem 0;
    background: var(--cream);
    position: sticky;
    top: 57px;
    z-index: 80;
    border-bottom: 1px solid var(--border-color);
}

.year-selector {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
    align-items: center;
}

.year-selector::before {
    content: 'Select Year';
    font-family: 'Cormorant Garamond', 'Georgia', serif;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-light);
    margin-right: 0.75rem;
}

.year-tab {
    padding: 0.65rem 2rem;
    border: 2px solid var(--border-color);
    border-radius: 50px;
    background: var(--white);
    font-family: 'Cormorant Garamond', 'Georgia', serif;
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-medium);
    cursor: pointer;
    transition: all 0.3s ease;
    min-height: 44px;
}

.year-tab:hover {
    border-color: var(--saffron);
    color: var(--deep-saffron);
}

.year-tab.active {
    background: linear-gradient(135deg, var(--saffron) 0%, var(--deep-saffron) 100%);
    color: var(--white);
    border-color: var(--deep-saffron);
    box-shadow: 0 4px 16px var(--shadow);
}

/* ---- Series Selector (multiple series per year) ---- */
.series-selector-section {
    padding: 1.25rem 0;
    background: var(--white);
    border-bottom: 1px solid var(--border-color);
}

.series-selector {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.series-tab {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.2rem;
    padding: 0.85rem 1.5rem;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    background: var(--white);
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: left;
    min-width: 200px;
    max-width: 360px;
}

.series-tab:hover {
    border-color: var(--saffron);
    box-shadow: 0 2px 12px var(--shadow);
}

.series-tab.active {
    border-color: var(--deep-saffron);
    background: linear-gradient(135deg, rgba(255,153,51,0.06), rgba(255,215,0,0.04));
    box-shadow: 0 2px 12px var(--shadow);
}

.series-tab-title {
    font-family: 'Cormorant Garamond', 'Georgia', serif;
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-dark);
    line-height: 1.3;
}

.series-tab.active .series-tab-title {
    color: var(--deep-saffron);
}

.series-tab-meta {
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--text-light);
}

/* ---- Timeline ---- */
.lectures-timeline-section {
    padding: 3rem 0 5rem;
    background: var(--cream);
    min-height: 50vh;
}

.lectures-timeline {
    --tl-line-left: 18px;
    --tl-dot-size: 14px;
    --tl-padding: 48px;
    position: relative;
    max-width: 860px;
    margin: 0 auto;
    padding-left: var(--tl-padding);
}

/* Vertical line */
.lectures-timeline::before {
    content: '';
    position: absolute;
    left: var(--tl-line-left);
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--saffron), var(--gold), var(--saffron));
    opacity: 0.4;
}

/* ---- Lecture Card ---- */
.lecture-node {
    position: relative;
    margin-bottom: 3rem;
    opacity: 0;
    transform: translateY(30px);
    animation: lectureReveal 0.6s ease forwards;
}

.lecture-node:nth-child(1) { animation-delay: 0.1s; }
.lecture-node:nth-child(2) { animation-delay: 0.22s; }
.lecture-node:nth-child(3) { animation-delay: 0.34s; }
.lecture-node:nth-child(4) { animation-delay: 0.46s; }
.lecture-node:nth-child(5) { animation-delay: 0.58s; }

@keyframes lectureReveal {
    to { opacity: 1; transform: translateY(0); }
}

/* Timeline dot — centered on the vertical line */
.lecture-node::before {
    content: '';
    position: absolute;
    left: calc(-1 * var(--tl-padding) + var(--tl-line-left) - var(--tl-dot-size) / 2 + 1px);
    top: 2rem;
    width: var(--tl-dot-size);
    height: var(--tl-dot-size);
    background: var(--white);
    border: 3px solid var(--saffron);
    border-radius: 50%;
    z-index: 2;
    transition: all 0.3s ease;
    box-shadow: 0 0 0 4px rgba(255,153,51,0.12);
}

.lecture-node:hover::before {
    background: var(--saffron);
    box-shadow: 0 0 0 8px rgba(255,153,51,0.18);
    transform: scale(1.2);
}

/* Date badge */
.lecture-date-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.35rem 1rem;
    background: linear-gradient(135deg, var(--saffron), var(--deep-saffron));
    color: var(--white);
    border-radius: 50px;
    font-family: 'Cormorant Garamond', 'Georgia', serif;
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    margin-bottom: 0.75rem;
    box-shadow: 0 2px 8px var(--shadow);
}

.lecture-date-badge svg {
    opacity: 0.85;
}

/* Card body */
.lecture-card {
    background: var(--white);
    border-radius: 16px;
    border: 1px solid var(--border-color);
    overflow: hidden;
    transition: all 0.35s ease;
    box-shadow: 0 2px 12px rgba(0,0,0,0.04);
}

.lecture-card:hover {
    box-shadow: 0 8px 32px var(--shadow);
    border-color: var(--saffron);
    transform: translateY(-4px);
}

.lecture-card-inner {
    padding: 2rem 2.25rem;
}

.lecture-card-top {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1rem;
}

.lecture-type {
    font-family: 'Cormorant Garamond', 'Georgia', serif;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-light);
}

.lecture-day-num {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.3rem 0.85rem;
    border-radius: 50px;
    background: linear-gradient(135deg, rgba(255,153,51,0.1), rgba(255,215,0,0.08));
    border: 1px solid rgba(255,153,51,0.2);
    font-family: 'Cormorant Garamond', 'Georgia', serif;
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--deep-saffron);
    flex-shrink: 0;
    white-space: nowrap;
}

.lecture-title {
    font-family: 'Cormorant Garamond', 'Georgia', serif;
    font-size: 1.65rem;
    font-weight: 700;
    color: var(--text-dark);
    line-height: 1.25;
    margin-bottom: 0.25rem;
}

.lecture-subtitle {
    font-family: 'Cormorant Garamond', 'Georgia', serif;
    font-size: 1.05rem;
    font-style: italic;
    color: var(--text-light);
    margin-bottom: 1rem;
}

.lecture-summary {
    font-size: 0.95rem;
    line-height: 1.75;
    color: var(--text-medium);
    margin-bottom: 1.25rem;
}

/* Topics accordion */
.lecture-topics-toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1.25rem;
    background: none;
    border: 1.5px solid var(--border-color);
    border-radius: 50px;
    font-family: 'Poppins', sans-serif;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-medium);
    cursor: pointer;
    transition: all 0.3s ease;
    min-height: 40px;
}

.lecture-topics-toggle:hover {
    border-color: var(--saffron);
    color: var(--deep-saffron);
    background: rgba(255,153,51,0.04);
}

.lecture-topics-toggle svg {
    transition: transform 0.3s ease;
    width: 14px;
    height: 14px;
}

.lecture-topics-toggle.expanded svg {
    transform: rotate(180deg);
}

.lecture-topics-list {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.lecture-topics-list.expanded {
    max-height: 800px;
}

.lecture-topics-inner {
    padding: 1.25rem 0 0.5rem;
}

.topic-item {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.5rem 0;
    font-size: 0.9rem;
    color: var(--text-medium);
    line-height: 1.5;
}

.topic-item::before {
    content: '';
    flex-shrink: 0;
    width: 6px;
    height: 6px;
    margin-top: 0.5em;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--gold), var(--saffron));
}

/* Card bottom accent bar */
.lecture-card-accent {
    height: 3px;
    background: linear-gradient(90deg, var(--gold), var(--saffron), var(--deep-saffron), var(--saffron), var(--gold));
    opacity: 0;
    transition: opacity 0.35s ease;
}

.lecture-card:hover .lecture-card-accent {
    opacity: 1;
}

/* ---- Location footer inside card ---- */
.lecture-location {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.82rem;
    color: var(--text-light);
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid rgba(230,213,184,0.5);
}

.lecture-location svg {
    flex-shrink: 0;
    opacity: 0.6;
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
    .lectures-hero {
        padding: 3.5rem 0 3rem;
    }

    .title-sanskrit {
        font-size: 3rem;
    }

    .title-english {
        font-size: 1.7rem;
    }

    .lectures-hero-sub {
        font-size: 1.05rem;
    }

    .hero-eyebrow {
        font-size: 0.9rem;
        letter-spacing: 0.12em;
    }

    .year-selector-section {
        top: 57px;
    }

    .series-selector {
        flex-direction: column;
        align-items: stretch;
    }

    .series-tab {
        max-width: 100%;
        min-width: 0;
    }

    .lectures-timeline {
        --tl-line-left: 14px;
        --tl-dot-size: 12px;
        --tl-padding: 38px;
    }

    .lecture-node::before {
        border-width: 2.5px;
    }

    .lecture-card-inner {
        padding: 1.5rem 1.25rem;
    }

    .lecture-title {
        font-size: 1.35rem;
    }

    .lecture-subtitle {
        font-size: 0.95rem;
    }

    .lecture-summary {
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .lectures-hero {
        padding: 2.5rem 0 2rem;
    }

    .title-sanskrit {
        font-size: 2.5rem;
    }

    .title-english {
        font-size: 1.35rem;
    }

    .hero-eyebrow {
        font-size: 0.75rem;
        letter-spacing: 0.06em;
    }

    .hero-meta {
        flex-direction: column;
        align-items: center;
        gap: 0.5rem;
    }

    .meta-pill {
        font-size: 0.78rem;
        padding: 0.4rem 0.85rem;
    }

    .year-selector::before {
        font-size: 0.75rem;
        margin-right: 0.5rem;
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
        gap: 0.75rem;
    }

    .pdf-btn {
        width: 100%;
        max-width: 280px;
        justify-content: center;
        font-size: 0.9rem;
        padding: 0.75rem 1.5rem;
    }

    .lectures-timeline {
        --tl-line-left: 10px;
        --tl-dot-size: 10px;
        --tl-padding: 30px;
    }

    .lecture-node::before {
        border-width: 2px;
    }

    .lecture-card-inner {
        padding: 1.25rem 1rem;
    }

    .lecture-title {
        font-size: 1.2rem;
    }

    .lecture-date-badge {
        font-size: 0.82rem;
    }

    .year-tab {
        padding: 0.5rem 1.5rem;
        font-size: 1rem;
    }
}