/* =========================================================
   Bilkent Case Study Page
   Brand vibe: institutional / heritage / refined digital
   ========================================================= */

:root {
    --bk-navy: #071D49;
    --bk-navy-2: #0B2B63;
    --bk-blue: #123A7A;
    --bk-gold: #C9A646;
    --bk-gold-soft: #E8D69A;
    --bk-cream: #F7F3E8;
    --bk-paper: #FBFAF6;
    --bk-ink: #14213D;
    --bk-muted: #6F7685;
    --bk-line: rgba(7, 29, 73, 0.10);
    --bk-font: 'Inter', 'Plus Jakarta Sans', 'Segoe UI', sans-serif;
    --bk-display-font: 'Cormorant Garamond', Georgia, serif;
}

.bilkent-hero,
.bilkent-intro,
.bilkent-feature-film,
.bilkent-social,
.bilkent-videos,
.bilkent-other-brands {
    font-family: var(--bk-font);
}

/* ---------- 1. HERO ---------- */
.bilkent-hero {
    position: relative;
    width: 100%;
    height: 100vh;
    min-height: 560px;
    overflow: hidden;
    background: var(--bk-navy);
}

.bilkent-hero__video {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 1;
}

.bilkent-hero__overlay {
    position: absolute;
    inset: 0;
    z-index: 2;
    display: flex;
    align-items: flex-end;
    padding-bottom: clamp(3rem, 7vw, 7rem);
    color: #fff;
    background:
        radial-gradient(circle at 78% 18%, rgba(201,166,70,0.22) 0%, transparent 32%),
        linear-gradient(180deg, rgba(7,29,73,0.12) 20%, rgba(7,29,73,0.86) 100%);
}

.bilkent-hero__brand-card {
    width: clamp(170px, 18vw, 245px);
    min-height: clamp(78px, 9vw, 112px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 18px 24px;
    border-radius: 18px;
    background: rgba(255,255,255,0.95);
    box-shadow: 0 18px 48px rgba(0,0,0,0.30);
    margin-bottom: 1.2rem;
}

.bilkent-hero__logo {
    max-width: 100%;
    max-height: 68px;
    object-fit: contain;
    display: block;
}

.bilkent-hero__eyebrow {
    display: inline-flex;
    align-items: center;
    padding: 0.52rem 1rem;
    border-radius: 999px;
    border: 1px solid rgba(232,214,154,0.34);
    background: rgba(7,29,73,0.38);
    color: var(--bk-gold-soft);
    font-size: 0.74rem;
    font-weight: 800;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    margin-bottom: 1.1rem;
    backdrop-filter: blur(10px);
}

.bilkent-hero h1 {
    color: #fff;
    font-family: var(--bk-display-font);
    font-size: clamp(3.2rem, 8vw, 7.4rem);
    font-weight: 700;
    line-height: 0.95;
    letter-spacing: -0.05em;
    margin: 0 0 1rem;
    text-shadow: 0 14px 36px rgba(0,0,0,0.30);
}

.bilkent-hero__subtitle {
    color: rgba(255,255,255,0.82);
    font-size: clamp(1rem, 1.55vw, 1.32rem);
    line-height: 1.75;
    max-width: 720px;
    margin: 0;
}

@media (max-width: 768px) {
    .bilkent-hero { height: 76vh; min-height: 500px; }
    .bilkent-hero__overlay { padding-bottom: 2.7rem; }
}

/* ---------- 2. INTRO ---------- */
.bilkent-intro {
    position: relative;
    background: var(--bk-paper);
    color: var(--bk-ink);
    padding: clamp(4rem, 7vw, 7rem) 0;
    overflow: hidden;
}

.bilkent-intro::before {
    content: '';
    position: absolute;
    top: -170px;
    right: -130px;
    width: 430px;
    height: 430px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(201,166,70,0.22), transparent 70%);
    pointer-events: none;
}

.bilkent-intro::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(201,166,70,0.42), transparent);
}

.bilkent-intro__grid {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: 1fr;
    gap: clamp(2rem, 5vw, 5rem);
    align-items: center;
}

.bilkent-intro__text {
    max-width: 980px;
    font-size: clamp(1.1rem, 2vw, 1.65rem);
    line-height: 1.75;
    color: #24324E;
    font-weight: 500;
}

.bilkent-intro__text span {
    display: inline;
    color: var(--bk-blue);
    font-weight: 800;
}

.bilkent-intro__stats {
    display: grid;
    gap: 14px;
}

.bilkent-intro__stats div {
    padding: 22px 24px;
    border-radius: 18px;
    background: #fff;
    border: 1px solid var(--bk-line);
    box-shadow: 0 14px 34px rgba(7,29,73,0.06);
}

.bilkent-intro__stats strong {
    display: block;
    color: var(--bk-navy);
    font-family: var(--bk-display-font);
    font-size: clamp(1.7rem, 2.8vw, 2.55rem);
    font-weight: 700;
    line-height: 1;
    margin-bottom: 7px;
}

.bilkent-intro__stats small {
    color: var(--bk-muted);
    font-weight: 700;
}

@media (max-width: 850px) {
    .bilkent-intro__grid { grid-template-columns: 1fr; }
}

/* ---------- Section headers ---------- */
.bilkent-section-head {
    max-width: 780px;
    margin: 0 auto clamp(2rem, 4vw, 3.5rem);
    text-align: center;
}

.bilkent-section-head span {
    display: inline-flex;
    align-items: center;
    padding: 7px 14px;
    border-radius: 999px;
    background: rgba(201,166,70,0.13);
    color: var(--bk-blue);
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    margin-bottom: 1rem;
}

.bilkent-section-head h2 {
    color: var(--bk-navy);
    font-family: var(--bk-display-font);
    font-size: clamp(2.15rem, 5vw, 4.65rem);
    font-weight: 700;
    letter-spacing: -0.045em;
    margin-bottom: 1rem;
}

.bilkent-section-head p {
    color: var(--bk-muted);
    line-height: 1.75;
    margin: 0;
}

.bilkent-section-head--light span {
    background: rgba(201,166,70,0.16);
    color: var(--bk-gold-soft);
}

.bilkent-section-head--light h2,
.bilkent-section-head--light p {
    color: #fff;
}

.bilkent-section-head--light p {
    color: rgba(255,255,255,0.70);
}

/* ---------- 3. FEATURE FILM ---------- */
.bilkent-feature-film {
    position: relative;
    background:
        radial-gradient(circle at 82% 8%, rgba(201,166,70,0.18), transparent 32%),
        linear-gradient(180deg, var(--bk-navy) 0%, #03122F 100%);
    padding: clamp(5rem, 8vw, 9rem) 0;
    overflow: hidden;
}

.bilkent-feature-film__frame {
    border-radius: 24px;
    overflow: hidden;
    border: 1px solid rgba(232,214,154,0.24);
    box-shadow: 0 30px 82px rgba(0,0,0,0.44);
    background: #000;
}

.bilkent-feature-film__frame video {
    width: 100%;
    display: block;
    aspect-ratio: 16 / 9;
    object-fit: cover;
}

/* ---------- 4. SOCIAL ---------- */
.bilkent-social {
    background: var(--bk-paper);
    padding: clamp(5rem, 8vw, 9rem) 0;
}

.bilkent-social__showcase {
    display: grid;
    grid-template-columns: 0.86fr 1.14fr;
    gap: clamp(1.4rem, 4vw, 3rem);
    align-items: center;
    padding: clamp(1.25rem, 3vw, 2rem);
    border-radius: 28px;
    background:
        linear-gradient(135deg, rgba(7,29,73,0.96), rgba(18,58,122,0.94)),
        var(--bk-navy);
    box-shadow: 0 24px 70px rgba(7,29,73,0.18);
}

.bilkent-social__copy {
    color: #fff;
    padding: clamp(1rem, 3vw, 2.5rem);
}

.bilkent-social__copy small {
    display: inline-flex;
    color: var(--bk-gold-soft);
    font-weight: 800;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    margin-bottom: 1rem;
}

.bilkent-social__copy h3 {
    font-family: var(--bk-display-font);
    color: #E52B3E;
    font-size: clamp(2rem, 4vw, 3.7rem);
    font-weight: 700;
    line-height: 1;
    margin-bottom: 1rem;
}

.bilkent-social__copy p {
    color: rgba(255,255,255,0.72);
    line-height: 1.75;
    margin: 0;
}

.bilkent-social__showcase img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 20px;
    background: #fff;
    box-shadow: 0 16px 44px rgba(0,0,0,0.24);
    transition: transform .35s ease, box-shadow .35s ease;
}

.bilkent-social__showcase img:hover {
    transform: translateY(-7px);
    box-shadow: 0 26px 58px rgba(0,0,0,0.30);
}

@media (max-width: 900px) {
    .bilkent-social__showcase { grid-template-columns: 1fr; }
}

/* ---------- 5. VIDEOS ---------- */
.bilkent-videos {
    position: relative;
    background:
        radial-gradient(circle at 12% 0%, rgba(201,166,70,0.18), transparent 30%),
        linear-gradient(180deg, #071D49 0%, #03122F 100%);
    padding: clamp(5rem, 8vw, 9rem) 0;
    overflow: hidden;
}

.bilkent-video-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: clamp(14px, 1.8vw, 22px);
    align-items: stretch;
}

.bilkent-video-card {
    width: 100%;
    aspect-ratio: 9 / 16;
    object-fit: cover;
    display: block;
    border-radius: 18px;
    background: #000;
    border: 1px solid rgba(232,214,154,0.18);
    box-shadow: 0 16px 40px rgba(0,0,0,0.36);
    transition: transform .35s ease, box-shadow .35s ease;
}

.bilkent-video-card--wide {
    grid-column: span 3;
    aspect-ratio: 16 / 9;
}

.bilkent-video-card:hover {
    transform: translateY(-7px);
    box-shadow: 0 28px 56px rgba(0,0,0,0.50);
}

@media (max-width: 900px) {
    .bilkent-video-grid { grid-template-columns: repeat(2, 1fr); }
    .bilkent-video-card--wide { grid-column: span 2; }
}

@media (max-width: 520px) {
    .bilkent-video-grid { grid-template-columns: 1fr; }
    .bilkent-video-card--wide { grid-column: span 1; }
}

/* ---------- 6. OTHER BRANDS ---------- */
.bilkent-other-brands {
    background: #fff;
    padding: clamp(5rem, 8vw, 10rem) 0;
}

.bilkent-other-title {
    color: var(--bk-navy);
    font-family: var(--bk-display-font);
    font-weight: 700;
    font-size: clamp(2.2rem, 4vw, 3.6rem);
    letter-spacing: -0.04em;
    margin-bottom: 1rem;
}

.bilkent-other-card {
    min-height: clamp(150px, 20vw, 230px);
    border-radius: 18px;
    background: var(--bk-paper);
    border: 1px solid var(--bk-line);
    color: var(--bk-navy);
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    font-weight: 800;
    letter-spacing: 0.12em;
    transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease, color .3s ease;
}

.bilkent-other-card:hover {
    transform: translateY(-7px);
    color: #8C6E18;
    border-color: rgba(201,166,70,0.38);
    box-shadow: 0 18px 42px rgba(7,29,73,0.09);
}

.bilkent-back {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    padding: 1rem 1.9rem;
    border-radius: 999px;
    background: var(--bk-navy);
    color: #fff;
    text-decoration: none;
    font-weight: 800;
    transition: transform .25s ease, background .25s ease, color .25s ease;
}

.bilkent-back:hover {
    background: var(--bk-gold);
    color: var(--bk-navy);
    transform: translateY(-2px);
}

@media (prefers-reduced-motion: reduce) {
    .bilkent-social__showcase img,
    .bilkent-video-card,
    .bilkent-other-card {
        transition: none !important;
    }
}