/* ===================================================================
   blog-index.css — editorial blog index for Advitya Healthcares

   One reading column: large image, article beside it, hairline rule, next
   article. Deliberately no cards, no shadows, no tint — whitespace and the
   rules carry the structure, which is what separates a publication from a
   card grid.

   Motion notes: everything animated here is transform or opacity, so the
   page stays on the compositor. The divider "draws" with scaleX rather than
   width for the same reason — animating width would relayout on every frame.
   Hover-only effects sit behind @media (hover: hover) so a touch device
   never gets stuck showing a hover state it cannot dismiss.
   =================================================================== */

html {
    scroll-behavior: smooth;
}

.ob {
    --ob-max: 1200px;
    --ob-maroon: #8B1014;
    --ob-brand: #8E1B2E;
    --ob-body: #52403E;
    --ob-muted: #8C7A77;
    --ob-rule: #EFE1DC;
    --ob-beige: #FAF4F1;
    --ob-ease: cubic-bezier(.22, .61, .36, 1);
    --ob-rise: 35px;

    background: #fff;
    color: var(--ob-body);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

.ob-wrap {
    max-width: var(--ob-max);
    margin: 0 auto;
    padding: 0 clamp(20px, 4vw, 40px);
}

/* ==================================================================
   1. page header — flourish, then title, then subtitle
   ================================================================== */
.ob-head {
    text-align: center;
    padding: clamp(64px, 8vw, 104px) 0 clamp(34px, 4vw, 48px);
}

.ob-eyebrow {
    display: inline-block;
    font-size: .74rem;
    font-weight: 600;
    letter-spacing: .26em;
    text-transform: uppercase;
    color: var(--ob-brand);
    margin-bottom: 18px;
}

.ob-head h1 {
    font-family: 'Outfit', sans-serif;
    font-size: clamp(2.3rem, 4.6vw, 3.3rem);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -.02em;
    color: var(--ob-maroon);
    margin: 0;
}

.ob-head p {
    max-width: 62ch;
    margin: 18px auto 0;
    font-size: clamp(1rem, 1.4vw, 1.1rem);
    line-height: 1.7;
    color: var(--ob-body);
}

/* the decorative rule: a short gradient bar with a diamond centred on it */
.ob-flourish {
    position: relative;
    width: 132px;
    height: 1px;
    margin: 30px auto 0;
    background: linear-gradient(90deg, transparent, var(--ob-brand), transparent);
}

.ob-flourish::after {
    content: '';
    position: absolute;
    left: 50%;
    top: 50%;
    width: 7px;
    height: 7px;
    background: var(--ob-brand);
    transform: translate(-50%, -50%) rotate(45deg);
}

/* The header reveals in its own order: rule, heading, subtitle, pills.
   .ob-lead elements start hidden and are released by .ob-ready on <body>,
   which the script sets on the first frame after load. */
.ob-lead {
    opacity: 0;
    translate: 0 22px;
    transition: opacity .8s var(--ob-ease), translate .8s var(--ob-ease);
    transition-delay: var(--d, 0s);
}

.ob-flourish.ob-lead {
    translate: 0 0;
    scale: 0 1;
    transition: opacity .7s var(--ob-ease), scale .8s var(--ob-ease);
}

.ob-ready .ob-lead {
    opacity: 1;
    translate: 0 0;
}

.ob-ready .ob-flourish.ob-lead {
    scale: 1 1;
}

/* ==================================================================
   2. category pills
   ================================================================== */
.ob-filters {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    padding-bottom: clamp(44px, 5vw, 64px);
}

.ob-pill {
    appearance: none;
    font: inherit;
    font-size: .88rem;
    font-weight: 500;
    color: var(--ob-body);
    background: #fff;
    border: 1px solid var(--ob-rule);
    border-radius: 50px;
    padding: .6rem 1.35rem;
    cursor: pointer;
    transition: color .35s ease, background-color .35s ease,
                border-color .35s ease, transform .35s var(--ob-ease);
}

.ob-pill.is-on {
    color: #fff;
    background: var(--ob-maroon);
    border-color: var(--ob-maroon);
}

/* ==================================================================
   3. the article column
   ================================================================== */
.ob-post {
    position: relative;
    display: grid;
    grid-template-columns: minmax(0, 48fr) minmax(0, 48fr);
    gap: clamp(38px, 5vw, 68px);
    align-items: center;
    color: inherit;
    padding: clamp(30px, 3.6vw, 52px) 0;
    transition: transform .35s var(--ob-ease);
}

.ob-post + .ob-post {
    margin-top: clamp(24px, 3vw, 38px);
}

/* The divider. A pseudo-element rather than a border, so it can draw itself
   across with scaleX when the article below it comes into view. */
.ob-post + .ob-post::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--ob-rule);
    transform: scaleX(0);
    transform-origin: left center;
    transition: transform .8s var(--ob-ease);
}

.ob-post.is-in::before {
    transform: scaleX(1);
}

/* ---- scroll reveal ----
   The article and each of its parts fade up together but on a short ladder:
   image, title, description, metadata, Read More. --s is the per-post base
   delay the script sets, so a screenful arriving at once still staggers. */
.ob-post .ob-media,
.ob-post .ob-body > * {
    opacity: 0;
    translate: 0 var(--ob-rise);
    /* Colour rides along here because this selector outranks `.ob-post h2`,
       and a transition shorthand replaces rather than merges — leaving it out
       would make the title's hover colour snap instead of fade. The reveal
       delay is written per property so hover colour stays instant. */
    --rd: calc(var(--s, 0s) + var(--i, 0) * 120ms);
    transition: opacity .8s var(--ob-ease) var(--rd),
                translate .8s var(--ob-ease) var(--rd),
                color .35s ease 0s;
}

.ob-post.is-in .ob-media,
.ob-post.is-in .ob-body > * {
    opacity: 1;
    translate: 0 0;
}

.ob-media {
    position: relative;
    overflow: hidden;
    border-radius: 3px;
    height: clamp(300px, 27vw, 410px);
    background: var(--ob-beige);
}

/* Every cover on this blog is a designed graphic, not a photograph: the
   headline runs across the top edge and a contact strip along the bottom,
   and the aspect ratios range from square to 2.3:1 banners. Cropping any of
   them to fill the frame sliced the words off, so covers are fitted whole
   and the leftover frame is filled with a blurred, dimmed copy of the cover
   rather than a flat block of beige. */
.ob-media::before {
    content: '';
    position: absolute;
    inset: -10%;
    background-image: var(--ob-bg, none);
    background-size: cover;
    background-position: center;
    filter: blur(26px) saturate(1.3);
    opacity: .48;
}

.ob-media img {
    position: relative;
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
    transition: transform .5s var(--ob-ease);
}

/* The one illustrated post ships as an SVG on white — it needs air inside
   the frame, and a blurred copy of white is just a grey wash, so the
   backdrop stays off and the beige ground shows through. */
.ob-media.is-art::before {
    display: none;
}

.ob-media.is-art img {
    padding: 5%;
}

.ob-body {
    min-width: 0;
}

.ob-post h2 {
    font-family: 'Outfit', sans-serif;
    font-size: clamp(1.5rem, 2.1vw, 1.95rem);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -.015em;
    color: var(--ob-maroon);
    margin: 0 0 18px;
    transition: color .35s ease;
}

/* the underline grows under the words themselves, not the whole column */
.ob-post h2 .ob-t {
    background-image: linear-gradient(var(--ob-brand), var(--ob-brand));
    background-repeat: no-repeat;
    background-position: 0 100%;
    background-size: 0 1.5px;
    transition: background-size .35s var(--ob-ease);
    padding-bottom: 3px;
}

.ob-excerpt {
    font-size: clamp(1rem, 1.15vw, 1.08rem);
    line-height: 1.6;
    color: var(--ob-body);
    margin: 0 0 20px;
    /* four lines, then a real ellipsis rather than a hand-typed one */
    display: -webkit-box;
    -webkit-line-clamp: 4;
    line-clamp: 4;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.ob-meta {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 9px;
    font-size: .84rem;
}

.ob-date {
    color: var(--ob-muted);
}

.ob-cat {
    color: var(--ob-maroon);
    font-weight: 600;
    transition: color .35s ease;
}

.ob-dot {
    width: 3px;
    height: 3px;
    border-radius: 50%;
    background: var(--ob-muted);
    opacity: .7;
}

.ob-more {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    margin-top: 22px;
    font-family: 'Outfit', sans-serif;
    font-size: .92rem;
    font-weight: 600;
    color: var(--ob-maroon);
}

.ob-more i {
    font-size: .82em;
    transition: transform .35s var(--ob-ease);
}

/* ---- hover, pointer devices only ---- */
@media (hover: hover) {
    .ob-post:hover {
        transform: translateY(-3px);
    }

    .ob-post:hover .ob-media img {
        transform: scale(1.035);
    }

    .ob-post:hover h2 {
        color: var(--ob-brand);
    }

    .ob-post:hover h2 .ob-t {
        background-size: 100% 1.5px;
    }

    .ob-post:hover .ob-cat {
        color: var(--ob-brand);
    }

    .ob-post:hover .ob-more i {
        transform: translateX(5px);
    }

    .ob-pill:hover {
        color: var(--ob-maroon);
        border-color: rgba(139, 16, 20, .32);
        background: var(--ob-beige);
        transform: translateY(-2px);
    }

    .ob-page:hover:not(:disabled):not(.is-on) {
        color: var(--ob-maroon);
        border-color: rgba(139, 16, 20, .32);
        background: var(--ob-beige);
        transform: translateY(-2px);
    }

    .ob-page.ob-step:hover:not(:disabled) i {
        transform: translateX(4px);
    }

    .ob-page.ob-prev:hover:not(:disabled) i {
        transform: translateX(-4px);
    }
}

/* ==================================================================
   4. pagination
   ================================================================== */
.ob-foot {
    position: relative;
    padding: clamp(46px, 6vw, 74px) 0 clamp(76px, 9vw, 118px);
    margin-top: clamp(24px, 3vw, 38px);
    text-align: center;
}

.ob-foot::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--ob-rule);
    transform: scaleX(0);
    transform-origin: left center;
    transition: transform .8s var(--ob-ease);
}

.ob-foot.is-in::before {
    transform: scaleX(1);
}

.ob-count {
    font-size: .84rem;
    color: var(--ob-muted);
    margin: 0 0 22px;
}

.ob-pager {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 8px;
}

.ob-page {
    appearance: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: 'Outfit', sans-serif;
    font-size: .93rem;
    font-weight: 600;
    color: var(--ob-body);
    background: #fff;
    border: 1px solid var(--ob-rule);
    border-radius: 3px;
    min-width: 42px;
    padding: .62rem .7rem;
    justify-content: center;
    cursor: pointer;
    transition: color .35s ease, background-color .35s ease,
                border-color .35s ease, transform .35s var(--ob-ease);
}

.ob-page i {
    font-size: .78em;
    transition: transform .35s var(--ob-ease);
}

.ob-page.is-on {
    color: #fff;
    background: var(--ob-maroon);
    border-color: var(--ob-maroon);
    cursor: default;
}

.ob-page.ob-step {
    padding-inline: 1.15rem;
}

.ob-page:disabled {
    opacity: .38;
    cursor: default;
}

.ob-gap {
    color: var(--ob-muted);
    padding: 0 4px;
    user-select: none;
}

.ob-empty {
    text-align: center;
    padding: clamp(48px, 7vw, 88px) 0;
    color: var(--ob-muted);
}

/* ==================================================================
   5. reading progress — a hairline on the right edge
   ================================================================== */
.ob-progress {
    position: fixed;
    top: 22vh;
    right: 18px;
    width: 2px;
    height: 56vh;
    z-index: 40;
    background: rgba(139, 16, 20, .1);
    border-radius: 2px;
    opacity: 0;
    transition: opacity .5s ease;
    pointer-events: none;
}

.ob-progress.is-on {
    opacity: 1;
}

.ob-progress span {
    display: block;
    width: 100%;
    height: 100%;
    border-radius: 2px;
    background: linear-gradient(180deg, var(--ob-brand, #8E1B2E), var(--ob-maroon, #8B1014));
    transform: scaleY(0);
    transform-origin: top center;
}

/* ==================================================================
   6. responsive
   ================================================================== */
@media (max-width: 900px) {
    .ob-post {
        grid-template-columns: minmax(0, 46fr) minmax(0, 50fr);
        gap: clamp(26px, 3.5vw, 38px);
    }

    .ob-media {
        height: clamp(230px, 30vw, 300px);
    }

    .ob-excerpt {
        -webkit-line-clamp: 3;
        line-clamp: 3;
    }

    .ob-more {
        margin-top: 18px;
    }
}

@media (max-width: 640px) {
    .ob {
        /* shorter travel reads better on a small screen */
        --ob-rise: 20px;
    }

    .ob-post {
        grid-template-columns: 1fr;
        gap: 20px;
        padding: 28px 0;
    }

    .ob-post + .ob-post {
        margin-top: 12px;
    }

    .ob-media {
        height: 230px;
    }

    .ob-post h2 {
        font-size: 1.42rem;
        margin-bottom: 12px;
    }

    .ob-excerpt {
        font-size: .97rem;
        margin-bottom: 16px;
    }

    .ob-page {
        min-width: 38px;
        padding: .55rem .6rem;
        font-size: .88rem;
    }

    /* the rail crowds a narrow screen and duplicates the browser's own cue */
    .ob-progress {
        display: none;
    }
}

/* ==================================================================
   7. reduced motion — content still arrives, it just does not travel
   ================================================================== */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    .ob-lead,
    .ob-post,
    .ob-post .ob-media,
    .ob-post .ob-body > *,
    .ob-media img,
    .ob-more i,
    .ob-page,
    .ob-page i,
    .ob-pill {
        transition: none;
        animation: none;
        opacity: 1;
        translate: none;
        scale: none;
        transform: none;
    }

    .ob-post + .ob-post::before,
    .ob-foot::before {
        transition: none;
        transform: scaleX(1);
    }

    .ob-progress {
        display: none;
    }
}