/* ============================================================
   Prashant Arya v2, case studies page styles
   Extends css/style.css with case-study components
   ============================================================ */

/* ---------- Page header ---------- */
.cs-page-header {
    position: relative; z-index: 1;
    min-height: 72vh;
    display: flex; flex-direction: column; justify-content: center;
    text-align: center;
    padding: 160px 24px 90px;
}
.cs-page-eyebrow {
    font-family: var(--font-display);
    font-size: 13px; letter-spacing: 0.35em; text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 28px;
}
.cs-page-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(48px, 10vw, 130px);
    line-height: 0.98; letter-spacing: -0.03em;
}
.cs-page-title .line { display: block; overflow: hidden; }
.cs-page-title em {
    font-family: var(--font-serif);
    font-style: italic; font-weight: 400;
    color: var(--accent);
}
.cs-page-title .char { display: inline-block; will-change: transform; }
.cs-page-subtitle {
    max-width: 640px; margin: 36px auto 0;
    font-size: clamp(15px, 1.8vw, 18px);
    color: var(--ink-70);
}

/* ---------- Case study article ---------- */
.case-study {
    position: relative; z-index: 1;
    padding: 110px 0;
    border-top: 1px solid var(--line);
}
.cs-header { margin-bottom: 60px; }
.cs-number {
    font-family: var(--font-display);
    font-size: 14px; font-weight: 600; letter-spacing: 0.3em;
    color: var(--accent);
    margin-bottom: 16px;
}
.cs-number::before { content: '/ '; color: var(--ink-35); }
.cs-title {
    font-family: var(--font-display);
    font-size: clamp(32px, 4.6vw, 58px);
    font-weight: 600; line-height: 1.06; letter-spacing: -0.02em;
    margin-bottom: 18px;
}
.cs-tagline {
    font-family: var(--font-serif);
    font-style: italic;
    font-size: clamp(18px, 2.2vw, 24px);
    color: var(--ink-70);
    max-width: 760px;
}
.cs-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.cs-tags span {
    font-family: var(--font-display);
    font-size: 12px; letter-spacing: 0.08em; text-transform: uppercase;
    color: var(--ink-50);
    padding: 7px 15px; border-radius: 999px;
    border: 1px solid var(--line); background: var(--glass);
}
.cs-tags span.accent {
    color: var(--accent);
    border-color: rgba(255, 122, 61, 0.35);
    background: rgba(255, 122, 61, 0.07);
}

/* ---------- Body: media + content ---------- */
.cs-body {
    display: grid; grid-template-columns: 1fr 1.15fr; gap: 60px;
    align-items: start;
}
.cs-media {
    position: sticky; top: 110px;
    border-radius: 22px;
    overflow: hidden;
    border: 1px solid var(--line);
    background: var(--glass);
}
.cs-media video { width: 100%; display: block; }
.cs-media--proto {
    display: flex; align-items: center; justify-content: center;
    padding: 40px 0;
    background: radial-gradient(600px circle at 50% 30%, rgba(255, 122, 61, 0.06), transparent 60%), var(--glass);
}
.cs-media--img img { width: 100%; display: block; }
.proto-frame { overflow: hidden; flex-shrink: 0; position: relative; border-radius: 28px;
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.6); }
.proto-frame iframe { border: none; display: block; transform-origin: top left; }

.cs-block { margin-bottom: 34px; }
.cs-block-label {
    font-family: var(--font-display);
    font-size: 12px; letter-spacing: 0.3em; text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 12px;
}
.cs-block-text { color: var(--ink-70); font-size: 16px; }
.cs-block-text strong { color: var(--ink); font-weight: 500; }

.cs-highlights { display: flex; flex-direction: column; gap: 12px; }
.cs-highlights span {
    position: relative;
    padding: 16px 20px 16px 42px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: var(--glass);
    color: var(--ink-70); font-size: 14.5px;
    transition: border-color 0.3s, background 0.3s;
}
.cs-highlights span:hover { border-color: rgba(255, 122, 61, 0.3); background: var(--glass-hover); }
.cs-highlights span::before {
    content: ''; position: absolute; left: 20px; top: 24px;
    width: 10px; height: 1.5px; background: var(--accent);
}

.cs-outcome {
    margin-top: 6px;
    padding: 26px 28px;
    border-radius: 16px;
    border: 1px solid rgba(255, 122, 61, 0.3);
    background: linear-gradient(145deg, rgba(255, 122, 61, 0.08), rgba(255, 122, 61, 0.02));
}
.cs-outcome .cs-block-label { margin-bottom: 8px; }
.cs-outcome-text { color: var(--ink-70); font-size: 15.5px; }
.cs-outcome-text strong { color: var(--ink); font-weight: 500; }

.cs-link {
    display: inline-flex; align-items: center; gap: 10px;
    margin-top: 30px;
    font-family: var(--font-display);
    font-size: 14px; font-weight: 500;
    color: var(--accent);
    border-bottom: 1px solid rgba(255, 122, 61, 0.35);
    padding-bottom: 4px;
    transition: gap 0.3s var(--ease-out), border-color 0.3s;
}
.cs-link:hover { gap: 16px; border-bottom-color: var(--accent); }

/* ---------- Chapter break ---------- */
.cs-chapter {
    position: relative; z-index: 1;
    text-align: center;
    padding: 150px 24px;
    border-top: 1px solid var(--line);
}
.cs-chapter-eyebrow {
    font-family: var(--font-display);
    font-size: 12px; letter-spacing: 0.4em; text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 22px;
}
.cs-chapter-title {
    font-family: var(--font-display);
    font-size: clamp(34px, 6vw, 72px);
    font-weight: 600; letter-spacing: -0.02em; line-height: 1.08;
}
.cs-chapter-title em {
    font-family: var(--font-serif);
    font-style: italic; font-weight: 400;
    color: var(--accent);
}
.cs-chapter-subtitle {
    max-width: 560px; margin: 24px auto 0;
    color: var(--ink-50); font-size: 16px;
}

/* ---------- Back button in nav ---------- */
.back-btn {
    display: inline-flex; align-items: center; gap: 10px;
    font-family: var(--font-display);
    font-size: 13px; letter-spacing: 0.06em; text-transform: uppercase;
    color: var(--ink-50);
    transition: color 0.25s, gap 0.3s var(--ease-out);
}
.back-btn:hover { color: var(--accent); gap: 14px; }
.nav-title {
    font-family: var(--font-display);
    font-size: 13px; letter-spacing: 0.1em; text-transform: uppercase;
    color: var(--ink-50);
}

/* ---------- Prev / next pager ---------- */
.cs-pager {
    display: flex; justify-content: space-between; gap: 20px;
    margin-top: 70px;
    padding-top: 34px;
    border-top: 1px solid var(--line);
}
.cs-pager-link {
    display: flex; flex-direction: column; gap: 6px;
    max-width: 46%;
    transition: transform 0.3s var(--ease-out);
}
.cs-pager-link--next { text-align: right; align-items: flex-end; margin-left: auto; }
.cs-pager-link:hover { transform: translateY(-3px); }
.cs-pager-dir {
    font-family: var(--font-display);
    font-size: 11px; letter-spacing: 0.25em; text-transform: uppercase;
    color: var(--ink-35);
    transition: color 0.25s;
}
.cs-pager-link:hover .cs-pager-dir { color: var(--accent); }
.cs-pager-title {
    font-family: var(--font-display);
    font-size: 16px; font-weight: 600;
    color: var(--ink-70);
    transition: color 0.25s;
}
.cs-pager-link:hover .cs-pager-title { color: var(--ink); }

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
    .cs-body { grid-template-columns: 1fr; gap: 40px; }
    .cs-media { position: relative; top: 0; }
    .case-study { padding: 80px 0; }
    .cs-page-header { min-height: 60vh; padding-top: 130px; }
    .nav-title { display: none; }
}