/* ============================================================
   DIVI TIMELINE EVENTS — timeline.css
   Advanced, mobile-first design with IISc navy/gold theme
   ============================================================ */

/* --- CSS Variables ----------------------------------------- */
:root {
    --dte-primary:       #1B3A6B;
    --dte-accent:        #C9A84C;
    --dte-axis:          #CBD5E1;
    --dte-dot-size:      18px;
    --dte-axis-width:    3px;
    --dte-card-bg:       #FFFFFF;
    --dte-card-shadow:   0 4px 24px rgba(27,58,107,0.10);
    --dte-card-hover:    0 8px 40px rgba(27,58,107,0.18);
    --dte-text:          #1E293B;
    --dte-muted:         #64748B;
    --dte-border:        #E2E8F0;
    --dte-radius:        14px;
    --dte-transition:    0.28s cubic-bezier(0.4,0,0.2,1);
    --dte-font-head:     'Georgia', 'Times New Roman', serif;
    --dte-font-body:     -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* --- Reset -------------------------------------------------- */
.dte-wrapper *,
.dte-wrapper *::before,
.dte-wrapper *::after {
    box-sizing: border-box;
}

/* ============================================================
   WRAPPER
   ============================================================ */
.dte-wrapper {
    font-family: var(--dte-font-body);
    color: var(--dte-text);
    padding: 20px 0 40px;
    position: relative;
}

.dte-section-title {
    font-family: var(--dte-font-head);
    font-size: clamp(1.6rem, 3vw, 2.4rem);
    color: var(--dte-primary);
    text-align: center;
    margin: 0 0 40px;
    position: relative;
    padding-bottom: 18px;
}
.dte-section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--dte-accent);
    border-radius: 99px;
}

/* ============================================================
   FILTER BAR
   ============================================================ */
.dte-filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    margin-bottom: 36px;
}
.dte-filter-btn {
    padding: 8px 22px;
    border: 2px solid var(--dte-border);
    background: #fff;
    color: var(--dte-muted);
    border-radius: 99px;
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--dte-transition);
    letter-spacing: 0.02em;
}
.dte-filter-btn:hover,
.dte-filter-btn.active {
    background: var(--dte-primary);
    border-color: var(--dte-primary);
    color: #fff;
}

/* ============================================================
   TIMELINE CONTAINER + AXIS
   ============================================================ */
.dte-timeline-container {
    position: relative;
    max-width: 1100px;
    margin: 0 auto;
}

/* Vertical axis line */
.dte-axis {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: var(--dte-axis-width);
    background: linear-gradient(180deg, transparent 0%, var(--dte-axis) 5%, var(--dte-axis) 95%, transparent 100%);
    z-index: 0;
}

.dte-items-list {
    position: relative;
    z-index: 1;
}

/* ============================================================
   TIMELINE ITEM
   ============================================================ */
.dte-item {
    display: grid;
    grid-template-columns: 1fr 60px 1fr;
    align-items: start;
    margin-bottom: 48px;
    position: relative;
    opacity: 0;
    animation: dteFadeIn 0.55s var(--dte-transition) forwards;
}
.dte-item:nth-child(1)  { animation-delay: 0.05s; }
.dte-item:nth-child(2)  { animation-delay: 0.12s; }
.dte-item:nth-child(3)  { animation-delay: 0.19s; }
.dte-item:nth-child(4)  { animation-delay: 0.26s; }
.dte-item:nth-child(5)  { animation-delay: 0.33s; }
.dte-item:nth-child(n+6){ animation-delay: 0.40s; }

@keyframes dteFadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* LEFT side: date marker left, card right */
.dte-item--left .dte-date-marker { grid-column: 1; text-align: right; padding-right: 10px; }
.dte-item--left .dte-connector   { grid-column: 2; justify-self: center; }
.dte-item--left .dte-card        { grid-column: 3; margin-left: 10px; }

/* RIGHT side: card left, date marker right */
.dte-item--right .dte-date-marker { grid-column: 3; text-align: left; padding-left: 10px; order: 3; }
.dte-item--right .dte-connector   { grid-column: 2; justify-self: center; order: 2; }
.dte-item--right .dte-card        { grid-column: 1; margin-right: 10px; order: 1; }

/* ============================================================
   DATE MARKER
   ============================================================ */
.dte-date-marker {
    padding-top: 20px;
    line-height: 1.2;
}
.dte-date-day {
    display: block;
    font-family: var(--dte-font-head);
    font-size: 2.6rem;
    font-weight: 700;
    color: var(--dte-primary);
    line-height: 1;
}
.dte-date-month {
    display: block;
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--dte-accent);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}
.dte-date-year {
    display: block;
    font-size: 0.8rem;
    color: var(--dte-muted);
    margin-top: 2px;
}

/* ============================================================
   CONNECTOR (center dot)
   ============================================================ */
.dte-connector {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-top: 24px;
}
.dte-dot {
    width: var(--dte-dot-size);
    height: var(--dte-dot-size);
    border-radius: 50%;
    background: var(--dte-primary);
    border: 3px solid #fff;
    box-shadow: 0 0 0 3px var(--dte-primary);
    position: relative;
    z-index: 2;
    transition: var(--dte-transition);
}
.dte-item:hover .dte-dot {
    background: var(--dte-accent);
    box-shadow: 0 0 0 3px var(--dte-accent);
    transform: scale(1.25);
}

/* ============================================================
   CARD
   ============================================================ */
.dte-card {
    background: var(--dte-card-bg);
    border-radius: var(--dte-radius);
    box-shadow: var(--dte-card-shadow);
    border: 1px solid var(--dte-border);
    overflow: hidden;
    transition: box-shadow var(--dte-transition), transform var(--dte-transition);
    position: relative;
}
.dte-card:hover {
    box-shadow: var(--dte-card-hover);
    transform: translateY(-3px);
}
.dte-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--dte-primary), var(--dte-accent));
    opacity: 0;
    transition: opacity var(--dte-transition);
}
.dte-card:hover::before {
    opacity: 1;
}

/* Card Image — FIXED HEIGHT, full image always visible */
.dte-card__image {
    position: relative;
    width: 100%;
    height: 220px !important;
    min-height: 220px !important;
    max-height: 220px !important;
    overflow: hidden !important;
    display: block;
    background: #EEF2F8;   /* neutral fill for letterbox areas */
}
.dte-card__image img {
    position: absolute !important;
    top: 0 !important;
    left: 0 !important;
    width: 100% !important;
    height: 100% !important;
    object-fit: contain !important;   /* show FULL image, no cropping */
    object-position: center center !important;
    display: block !important;
    margin: 0 !important;
    padding: 0 !important;
    max-width: none !important;
    transition: transform 0.45s ease;
}
.dte-card:hover .dte-card__image img {
    transform: scale(1.03);
}

/* Category Pill */
.dte-card__cat {
    position: absolute;
    bottom: 10px;
    left: 12px;
    background: var(--dte-primary);
    color: #fff;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    padding: 4px 10px;
    border-radius: 99px;
}
.dte-card__cat.dte-cat--news        { background: #0F766E; }
.dte-cat--events                    { background: #7C3AED; }
.dte-cat--announcements             { background: #B45309; }
.dte-cat--research                  { background: #1B3A6B; }

/* Badge */
.dte-card__badge {
    position: absolute;
    top: 12px;
    right: -6px;
    background: var(--dte-accent);
    color: #1B2040;
    font-size: 0.7rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    padding: 5px 14px 5px 10px;
    border-radius: 4px 0 0 4px;
    box-shadow: 2px 2px 8px rgba(0,0,0,0.15);
}
.dte-card__badge::after {
    content: '';
    position: absolute;
    right: -6px;
    bottom: -6px;
    border-left: 6px solid #8B6A1A;
    border-bottom: 6px solid transparent;
}

/* Card Body */
.dte-card__body {
    padding: 18px 20px 20px;
}

.dte-card__title {
    font-family: var(--dte-font-head);
    font-size: 1.05rem;
    font-weight: 700;
    line-height: 1.4;
    margin: 0 0 10px;
}
.dte-card__title a {
    color: var(--dte-primary);
    text-decoration: none;
    transition: color var(--dte-transition);
}
.dte-card__title a:hover {
    color: var(--dte-accent);
}

/* Meta Row */
.dte-card__meta {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 12px;
    font-size: 0.8rem;
    color: var(--dte-muted);
}
.dte-card__meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}
.dte-card__meta svg {
    width: 13px;
    height: 13px;
    flex-shrink: 0;
}

/* Excerpt */
.dte-card__excerpt {
    font-size: 0.88rem;
    color: var(--dte-muted);
    line-height: 1.65;
    margin: 0 0 16px;
}

/* Read More */
.dte-card__btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.82rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--dte-primary);
    text-decoration: none;
    border-bottom: 2px solid var(--dte-accent);
    padding-bottom: 2px;
    transition: color var(--dte-transition), border-color var(--dte-transition);
}
.dte-card__btn:hover {
    color: var(--dte-accent);
    border-color: var(--dte-primary);
}
.dte-card__btn svg {
    width: 14px;
    height: 14px;
    transition: transform var(--dte-transition);
}
.dte-card__btn:hover svg {
    transform: translateX(4px);
}

/* ============================================================
   LOAD MORE
   ============================================================ */
.dte-load-more-wrap {
    text-align: center;
    margin-top: 16px;
    padding-top: 32px;
}
.dte-load-more-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 13px 34px;
    background: var(--dte-primary);
    color: #fff;
    border: none;
    border-radius: 99px;
    font-size: 0.9rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    cursor: pointer;
    transition: background var(--dte-transition), transform var(--dte-transition), box-shadow var(--dte-transition);
    box-shadow: 0 4px 18px rgba(27,58,107,0.22);
}
.dte-load-more-btn:hover {
    background: var(--dte-accent);
    color: #1B2040;
    transform: translateY(-2px);
    box-shadow: 0 8px 28px rgba(201,168,76,0.35);
}
.dte-load-more-btn svg {
    width: 16px;
    height: 16px;
    transition: transform var(--dte-transition);
}
.dte-load-more-btn:hover svg {
    transform: translateY(3px);
}
.dte-load-more-btn.dte-loading {
    opacity: 0.7;
    pointer-events: none;
}
.dte-load-more-btn.dte-loading span::after {
    content: '…';
    animation: ellipsis 1.2s infinite;
}

/* ============================================================
   THEME VARIANTS
   ============================================================ */

/* --- MINIMAL (all cards on left, single line) --- */
.dte-theme--minimal .dte-axis {
    left: 40px;
}
.dte-theme--minimal .dte-item {
    grid-template-columns: 80px 40px 1fr;
}
.dte-theme--minimal .dte-item--left,
.dte-theme--minimal .dte-item--right {
    grid-template-columns: 80px 40px 1fr;
}
.dte-theme--minimal .dte-item--right .dte-card   { grid-column: 3; order: unset; margin-right: 0; margin-left: 10px; }
.dte-theme--minimal .dte-item--right .dte-date-marker { grid-column: 1; order: unset; text-align: right; padding-left: 0; padding-right: 6px; }
.dte-theme--minimal .dte-item--right .dte-connector   { grid-column: 2; order: unset; }

/* --- COMPACT --- */
.dte-theme--compact .dte-card__image { height: 110px; }
.dte-theme--compact .dte-card__excerpt { display: none; }
.dte-theme--compact .dte-date-day { font-size: 2rem; }

/* --- CARDS (uniform, centered, stacked) --- */
.dte-theme--cards .dte-axis { display: none; }
.dte-theme--cards .dte-items-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 28px;
}
.dte-theme--cards .dte-item {
    display: block;
    animation: dteFadeIn 0.55s var(--dte-transition) forwards;
}
.dte-theme--cards .dte-connector { display: none; }
.dte-theme--cards .dte-date-marker {
    padding: 12px 16px 0;
    text-align: left !important;
    display: flex;
    gap: 8px;
    align-items: baseline;
}
.dte-theme--cards .dte-date-day   { font-size: 1.8rem; }
.dte-theme--cards .dte-date-month { font-size: 0.85rem; }
.dte-theme--cards .dte-date-year  { font-size: 0.75rem; }

/* ============================================================
   NO POSTS
   ============================================================ */
.dte-no-posts {
    text-align: center;
    color: var(--dte-muted);
    padding: 48px;
    font-size: 1rem;
    background: #F8FAFC;
    border-radius: var(--dte-radius);
    border: 2px dashed var(--dte-border);
}

/* ============================================================
   RESPONSIVE — TABLET (max 900px)
   ============================================================ */
@media (max-width: 900px) {
    .dte-axis {
        left: 28px;
    }
    .dte-item,
    .dte-item--left,
    .dte-item--right {
        grid-template-columns: 56px 28px 1fr;
    }
    .dte-item--right .dte-card        { grid-column: 3; margin-right: 0; margin-left: 10px; order: unset; }
    .dte-item--right .dte-date-marker { grid-column: 1; text-align: right; padding-left: 0; padding-right: 6px; order: unset; }
    .dte-item--right .dte-connector   { grid-column: 2; order: unset; }

    .dte-date-day   { font-size: 1.8rem; }
    .dte-date-month { font-size: 0.82rem; }
}

/* ============================================================
   RESPONSIVE — MOBILE (max 600px)
   ============================================================ */
@media (max-width: 600px) {
    .dte-axis {
        left: 20px;
    }
    .dte-item,
    .dte-item--left,
    .dte-item--right {
        grid-template-columns: 44px 24px 1fr;
        margin-bottom: 28px;
    }

    /* Override right-side layout to always be left-aligned on mobile */
    .dte-item--right .dte-card {
        grid-column: 3 !important;
        margin-right: 0 !important;
        margin-left: 8px !important;
        order: unset !important;
    }
    .dte-item--right .dte-date-marker {
        grid-column: 1 !important;
        text-align: right !important;
        padding-left: 0 !important;
        padding-right: 4px !important;
        order: unset !important;
    }
    .dte-item--right .dte-connector {
        grid-column: 2 !important;
        order: unset !important;
    }

    .dte-date-marker { padding-top: 14px; }
    .dte-date-day    { font-size: 1.35rem; }
    .dte-date-month  { font-size: 0.7rem; }
    .dte-date-year   { display: none; }

    .dte-dot {
        width: 13px;
        height: 13px;
    }
    .dte-connector { padding-top: 18px; }

    .dte-card__image  { height: 180px !important; min-height: 180px !important; max-height: 180px !important; }
    .dte-card__body   { padding: 12px 14px 14px; }
    .dte-card__title  { font-size: 0.95rem; }
    .dte-card__excerpt{ font-size: 0.83rem; }
    .dte-card__meta   { gap: 8px; font-size: 0.75rem; }

    .dte-filter-bar { gap: 7px; }
    .dte-filter-btn { padding: 6px 14px; font-size: 0.78rem; }

    .dte-load-more-btn { padding: 11px 24px; font-size: 0.84rem; }

    /* Cards theme: single column */
    .dte-theme--cards .dte-items-list {
        grid-template-columns: 1fr;
    }
}

/* ============================================================
   DIVI COMPATIBILITY
   ============================================================ */
.et_pb_module .dte-wrapper { padding-top: 0; }
.et_pb_text .dte-wrapper   { padding-top: 0; }

/* Divi resets max-width on images — override it back */
.et_pb_module .dte-card__image,
.et_pb_text   .dte-card__image,
.et-db         .dte-card__image {
    height: 220px !important;
    min-height: 220px !important;
    max-height: 220px !important;
    overflow: hidden !important;
    background: #EEF2F8 !important;
}
.et_pb_module .dte-card__image img,
.et_pb_text   .dte-card__image img,
.et-db         .dte-card__image img {
    position: absolute !important;
    top: 0 !important; left: 0 !important;
    width: 100% !important;
    height: 100% !important;
    max-width: none !important;
    object-fit: contain !important;
    object-position: center center !important;
}