/* ================================================================
 * TSV — Bilgi Merkezi (Knowledge Hub)
 *
 * Professional editorial layout:
 *   - Hero: Featured spotlight (2/3) + Side stack (1/3, 3 small cards)
 *   - Filter Tabs (kategoriye göre client-side filtreleme)
 *   - Grid: 3-kolon makale kartları (masonry-ish, equal height)
 *   - Empty state, stagger entrance, hover transitions
 *
 * Renkler: TSV Navy + Cool Gray + White. Kurumsal.
 * AI vibe yok, gerçek editor mimarisi.
 * ================================================================ */

:root {
    --tsv-knowledge-navy: #15355c;
    --tsv-knowledge-navy-dark: #0f2746;
    --tsv-knowledge-blue: #2563a8;
    --tsv-knowledge-red: #b8392a;
    --tsv-knowledge-amber: #f59e0b;
    --tsv-knowledge-emerald: #047857;
    --tsv-knowledge-violet: #7c3aed;
    --tsv-knowledge-cool: #f3f5f9;
    --tsv-knowledge-line: #e6eaf0;
    --tsv-knowledge-line-2: #d3dae5;
    --tsv-knowledge-ink: #1c2434;
    --tsv-knowledge-ink-2: #5a6478;
    --tsv-knowledge-ink-3: #8a93a6;
}

/* ==== KEYFRAMES ==== */
@keyframes tsv-kn-fade-up {
    from { opacity: 0; transform: translateY(16px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes tsv-kn-pulse-dot {
    0%, 100% { box-shadow: 0 0 0 4px rgba(184, 57, 42, 0.12); }
    50% { box-shadow: 0 0 0 10px rgba(184, 57, 42, 0); }
}

/* ==== SECTION ==== */
.tsv-knowledge {
    background: var(--tsv-knowledge-cool);
    padding: 96px 0 104px;
    position: relative;
}
.tsv-knowledge .container {
    max-width: 1280px;
    padding: 0 24px;
    margin: 0 auto;
    width: 100%;
}

/* ==== HEAD ==== */
.tsv-knowledge-head {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 40px 60px;
    align-items: end;
    margin-bottom: 48px;
}
.tsv-knowledge-head__intro {
    max-width: 760px;
}
.tsv-knowledge-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--tsv-knowledge-red);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    margin-bottom: 18px;
}
.tsv-knowledge-eyebrow i { font-size: 13px; }
.tsv-knowledge-title {
    font-size: 38px !important;
    font-weight: 800;
    color: var(--tsv-knowledge-navy);
    line-height: 1.15;
    margin: 0 0 16px;
    letter-spacing: -0.022em;
}
.tsv-knowledge-title em {
    font-style: italic;
    font-weight: 700;
    color: var(--tsv-knowledge-red);
}
.tsv-knowledge-sub {
    color: var(--tsv-knowledge-ink-2);
    font-size: 16px;
    line-height: 1.6;
    margin: 0;
    max-width: 620px;
}

/* CTA */
.tsv-knowledge-cta {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 13px 24px;
    background: var(--tsv-knowledge-navy);
    border-radius: 8px;
    color: #ffffff !important;
    font-size: 14.5px;
    font-weight: 600;
    text-decoration: none !important;
    transition: background .25s ease, transform .25s ease, box-shadow .25s ease;
    box-shadow: 0 4px 14px rgba(21, 53, 92, 0.18);
}
.tsv-knowledge-cta:hover {
    background: var(--tsv-knowledge-red) !important;
    color: #ffffff !important;
    transform: translateY(-2px);
    box-shadow: 0 12px 24px rgba(184, 57, 42, 0.28) !important;
}
.tsv-knowledge-cta i { transition: transform .25s ease; }
.tsv-knowledge-cta:hover i { transform: translateX(4px); }

/* ==== HERO (featured spotlight + side stack) ==== */
.tsv-knowledge-hero {
    display: grid;
    grid-template-columns: 1.6fr 1fr;
    gap: 40px;
    margin-bottom: 56px;
}

/* Featured spotlight */
.tsv-knowledge-spotlight {
    background: #ffffff;
    border-radius: 18px;
    overflow: hidden;
    border: 1px solid var(--tsv-knowledge-line);
    display: flex;
    flex-direction: column;
    transition: box-shadow .35s ease, transform .35s ease;
}
.tsv-knowledge-spotlight:hover {
    box-shadow: 0 24px 60px rgba(21, 53, 92, 0.14);
    transform: translateY(-3px);
}
.tsv-knowledge-spotlight__media {
    display: block;
    position: relative;
    overflow: hidden;
    aspect-ratio: 16 / 10;
}
.tsv-knowledge-spotlight__media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform .7s cubic-bezier(.4, 0, .2, 1);
}
.tsv-knowledge-spotlight:hover .tsv-knowledge-spotlight__media img {
    transform: scale(1.04);
}
.tsv-knowledge-spotlight__badge {
    position: absolute;
    top: 18px;
    left: 18px;
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 7px 14px;
    background: rgba(255, 255, 255, 0.96);
    border-radius: 6px;
    font-size: 12px;
    font-weight: 700;
    color: var(--tsv-knowledge-navy);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    backdrop-filter: blur(8px);
}
.tsv-knowledge-spotlight__badge i {
    color: var(--tsv-knowledge-red);
    font-size: 11px;
}
.tsv-knowledge-spotlight__body {
    padding: 30px 32px 32px;
    display: flex;
    flex-direction: column;
    flex: 1;
}
.tsv-knowledge-spotlight__chips {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 16px;
}
.tsv-knowledge-chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 11px;
    background: var(--tsv-knowledge-cool);
    border-radius: 999px;
    font-size: 12px;
    font-weight: 600;
    color: var(--tsv-knowledge-ink-2);
    letter-spacing: 0.01em;
}
.tsv-knowledge-chip i {
    font-size: 10px;
    opacity: 0.7;
}
.tsv-knowledge-chip--meta {
    background: rgba(21, 53, 92, 0.06);
    color: var(--tsv-knowledge-navy);
}
.tsv-knowledge-spotlight__title {
    font-size: 28px !important;
    font-weight: 800 !important;
    line-height: 1.22 !important;
    margin: 0 0 16px !important;
    letter-spacing: -0.02em !important;
}
.tsv-knowledge-spotlight__title a {
    color: var(--tsv-knowledge-navy) !important;
    text-decoration: none !important;
    transition: color .25s ease;
}
.tsv-knowledge-spotlight__title a:hover {
    color: var(--tsv-knowledge-red) !important;
}
.tsv-knowledge-spotlight__excerpt {
    color: var(--tsv-knowledge-ink-2);
    font-size: 16px;
    line-height: 1.65;
    margin: 0 0 24px;
    flex: 1;
}
.tsv-knowledge-spotlight__foot {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding-top: 22px;
    border-top: 1px solid var(--tsv-knowledge-line);
}
.tsv-knowledge-spotlight__meta {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--tsv-knowledge-ink-3);
    font-weight: 500;
}
.tsv-knowledge-spotlight__meta i { font-size: 12px; opacity: 0.85; }
.tsv-knowledge-spotlight__cta {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    padding: 11px 22px;
    background: var(--tsv-knowledge-navy);
    border-radius: 7px;
    color: #ffffff !important;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none !important;
    transition: background .25s ease, gap .25s ease;
}
.tsv-knowledge-spotlight__cta:hover {
    background: var(--tsv-knowledge-red) !important;
    gap: 13px;
}
.tsv-knowledge-spotlight__cta i { font-size: 12px; }

/* ==== SIDE STACK ==== */
.tsv-knowledge-side {
    display: flex;
    flex-direction: column;
    gap: 16px;
}
.tsv-knowledge-side-card {
    display: flex;
    gap: 18px;
    background: #ffffff;
    border: 1px solid var(--tsv-knowledge-line);
    border-radius: 14px;
    padding: 16px;
    transition: box-shadow .3s ease, transform .3s ease, border-color .3s ease;
}
.tsv-knowledge-side-card:hover {
    box-shadow: 0 14px 32px rgba(21, 53, 92, 0.10);
    transform: translateY(-2px);
    border-color: var(--tsv-knowledge-navy);
}
.tsv-knowledge-side-card__thumb {
    display: block;
    flex: 0 0 110px;
    width: 110px;
    height: 110px;
    border-radius: 10px;
    overflow: hidden;
    position: relative;
}
.tsv-knowledge-side-card__thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform .5s ease;
}
.tsv-knowledge-side-card:hover .tsv-knowledge-side-card__thumb img {
    transform: scale(1.06);
}
.tsv-knowledge-side-card__body {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-width: 0;
    padding: 2px 0;
}
.tsv-knowledge-side-card__body .tsv-knowledge-chip {
    font-size: 11.5px;
    margin-bottom: 10px;
    align-self: flex-start;
}
.tsv-knowledge-side-card__title {
    font-size: 15.5px !important;
    font-weight: 700 !important;
    line-height: 1.35 !important;
    margin: 0 0 10px !important;
    letter-spacing: -0.005em !important;
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.tsv-knowledge-side-card__title a {
    color: var(--tsv-knowledge-ink) !important;
    text-decoration: none !important;
    transition: color .25s ease;
}
.tsv-knowledge-side-card__title a:hover {
    color: var(--tsv-knowledge-red) !important;
}
.tsv-knowledge-side-card__meta {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    color: var(--tsv-knowledge-ink-3);
    font-weight: 500;
    margin-top: auto;
}
.tsv-knowledge-side-card__meta i { font-size: 11px; opacity: 0.8; }

/* ==== GRID ==== */
.tsv-knowledge-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 28px;
    margin-top: 0;
}

.tsv-knowledge-card {
    background: #ffffff;
    border: 1px solid var(--tsv-knowledge-line);
    border-radius: 14px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: transform .35s cubic-bezier(.34, 1.3, .64, 1), box-shadow .35s ease, border-color .3s ease;
    opacity: 0;
    transform: translateY(14px);
}
.tsv-knowledge-card.is-visible {
    opacity: 1;
    transform: translateY(0);
    transition:
        opacity .5s ease,
        transform .5s cubic-bezier(.34, 1.2, .64, 1),
        box-shadow .35s ease,
        border-color .3s ease;
    transition-delay: calc(var(--i, 0) * 60ms);
}
.tsv-knowledge-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 18px 40px rgba(21, 53, 92, 0.12);
    border-color: var(--tsv-knowledge-navy);
}
.tsv-knowledge-card.is-hidden {
    display: none;
}
.tsv-knowledge-card__thumb {
    display: block;
    position: relative;
    overflow: hidden;
    aspect-ratio: 16 / 10;
}
.tsv-knowledge-card__thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform .5s cubic-bezier(.4, 0, .2, 1);
}
.tsv-knowledge-card:hover .tsv-knowledge-card__thumb img {
    transform: scale(1.05);
}
.tsv-knowledge-card__time {
    position: absolute;
    bottom: 12px;
    right: 12px;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 5px 10px;
    background: rgba(0, 0, 0, 0.65);
    border-radius: 6px;
    color: #ffffff;
    font-size: 11.5px;
    font-weight: 600;
    backdrop-filter: blur(8px);
}
.tsv-knowledge-card__time i {
    font-size: 10px;
    opacity: 0.85;
}
.tsv-knowledge-card__body {
    padding: 20px 22px 22px;
    display: flex;
    flex-direction: column;
    flex: 1;
}
.tsv-knowledge-card__body .tsv-knowledge-chip {
    font-size: 11.5px;
    margin-bottom: 12px;
    align-self: flex-start;
}
.tsv-knowledge-card__title {
    font-size: 17px !important;
    font-weight: 700 !important;
    line-height: 1.4 !important;
    margin: 0 0 12px !important;
    letter-spacing: -0.005em !important;
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.tsv-knowledge-card__title a {
    color: var(--tsv-knowledge-ink) !important;
    text-decoration: none !important;
    transition: color .25s ease;
}
.tsv-knowledge-card__title a:hover {
    color: var(--tsv-knowledge-red) !important;
}
.tsv-knowledge-card__excerpt {
    color: var(--tsv-knowledge-ink-2);
    font-size: 14px;
    line-height: 1.55;
    margin: 0 0 18px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.tsv-knowledge-card__foot {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding-top: 14px;
    border-top: 1px solid var(--tsv-knowledge-line);
    margin-top: auto;
}
.tsv-knowledge-card__date {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    color: var(--tsv-knowledge-ink-3);
    font-weight: 500;
}
.tsv-knowledge-card__date i {
    font-size: 11px;
    opacity: 0.85;
}
.tsv-knowledge-card__arrow {
    width: 30px;
    height: 30px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--tsv-knowledge-cool);
    border-radius: 50%;
    color: var(--tsv-knowledge-navy);
    font-size: 12px;
    text-decoration: none !important;
    transition: background .2s ease, color .2s ease, transform .25s ease;
}
.tsv-knowledge-card__arrow:hover {
    background: var(--tsv-knowledge-navy);
    color: #ffffff;
    transform: translateX(2px);
}

/* ==== ENTRANCE (hero da) ==== */
.tsv-knowledge-spotlight,
.tsv-knowledge-side-card {
    opacity: 0;
    transform: translateY(14px);
}
.tsv-knowledge-spotlight.is-visible,
.tsv-knowledge-side-card.is-visible {
    opacity: 1;
    transform: translateY(0);
    animation: tsv-kn-fade-up .55s cubic-bezier(.34, 1.2, .64, 1) both;
    animation-delay: calc(var(--i, 0) * 70ms);
}

/* ==== RESPONSIVE — XL ==== */
@media (max-width: 1180px) {
    .tsv-knowledge-hero { gap: 32px; }
    .tsv-knowledge-title { font-size: 32px !important; }
}

/* ==== RESPONSIVE — TABLET ==== */
@media (max-width: 900px) {
    .tsv-knowledge { padding: 72px 0 80px; }
    .tsv-knowledge-head {
        grid-template-columns: 1fr;
        gap: 28px;
        align-items: stretch;
        margin-bottom: 36px;
    }
    .tsv-knowledge-cta { align-self: flex-start; }
    .tsv-knowledge-title { font-size: 28px !important; }
    .tsv-knowledge-hero {
        grid-template-columns: 1fr;
        gap: 28px;
        margin-bottom: 40px;
    }
    .tsv-knowledge-side {
        display: grid;
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 16px;
    }
    .tsv-knowledge-side-card { flex-direction: column; gap: 14px; padding: 0; border: none; }
    .tsv-knowledge-side-card__thumb {
        width: 100%;
        height: auto;
        aspect-ratio: 16/10;
        flex: none;
    }
    .tsv-knowledge-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 22px;
    }
}

/* ==== RESPONSIVE — KÜÇÜK TABLET ==== */
@media (max-width: 720px) {
    .tsv-knowledge-side {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    .tsv-knowledge-side-card { flex-direction: row; padding: 16px; }
    .tsv-knowledge-side-card__thumb {
        width: 90px; height: 90px; aspect-ratio: 1;
    }
    .tsv-knowledge-tabs__list { width: 100%; }
}

/* ==== RESPONSIVE — MOBİL ==== */
@media (max-width: 540px) {
    .tsv-knowledge { padding: 56px 0 64px; }
    .tsv-knowledge-title { font-size: 24px !important; }
    .tsv-knowledge-sub { font-size: 14.5px; }
    .tsv-knowledge-spotlight__body { padding: 22px 22px 24px; }
    .tsv-knowledge-spotlight__title { font-size: 22px !important; }
    .tsv-knowledge-spotlight__excerpt { font-size: 14.5px; }
    .tsv-knowledge-grid { grid-template-columns: 1fr; gap: 18px; }
    .tsv-knowledge-card__body { padding: 18px 20px 20px; }
    .tsv-knowledge-card__title { font-size: 16px !important; }
    .tsv-knowledge-side-card__title { font-size: 14.5px !important; }
    .tsv-knowledge-spotlight__foot {
        flex-direction: column;
        align-items: flex-start;
        gap: 14px;
    }
    .tsv-knowledge-spotlight__cta { align-self: stretch; justify-content: center; }
}