/* =====================================================
   CASE STUDY PAGE STYLES
   Used by: case-study-01.html through case-study-04.html
   Requires: shared.css loaded first
   ===================================================== */

/* ===== PAGE BASE ===== */
body {
    background: var(--bg);
    color: var(--text);
}

/* ===== HERO ===== */
.cs-hero {
    padding: 10rem 3rem 6rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6rem;
    align-items: end;
    border-bottom: 1px solid var(--border);
}
.cs-eyebrow {
    font-size: 0.68rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--teal);
    font-weight: 500;
    margin-bottom: 1.5rem;
}
.cs-number {
    font-family: var(--font-display);
    font-size: clamp(5rem, 10vw, 9rem);
    font-weight: 300;
    font-style: italic;
    line-height: 0.85;
    color: rgba(13,12,9,0.08);
    margin-bottom: 2rem;
}
.cs-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 3.5vw, 3rem);
    font-weight: 300;
    line-height: 1.2;
    letter-spacing: -0.01em;
}
.cs-title em { font-style: italic; }
.cs-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 2rem; }
.cs-tag {
    font-size: 0.65rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    padding: 0.3rem 0.8rem;
    border: 1px solid var(--border);
    border-radius: 100px;
    color: var(--text-muted);
}
.cs-summary {
    font-size: 1rem;
    color: var(--text-muted);
    line-height: 1.8;
    max-width: 44ch;
}

/* ===== METRICS BAR ===== */
.metrics-bar {
    background: var(--bg-dark);
    display: grid;
    grid-template-columns: repeat(3, 1fr);
}
.metric {
    padding: 3rem;
    border-right: 1px solid rgba(243,237,226,0.08);
}
.metric:last-child { border-right: none; }
.metric-number {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 4vw, 3.5rem);
    font-weight: 300;
    font-style: italic;
    line-height: 1;
    color: #F3EDE2;
    margin-bottom: 0.5rem;
}
.metric-label {
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: rgba(243,237,226,0.50);
}

/* ===== BODY CONTENT ===== */
.cs-body {
    max-width: 760px;
    margin: 0 auto;
    padding: 6rem 3rem;
}
.cs-section { margin-bottom: 5rem; }
.cs-section .section-label { margin-bottom: 1.5rem; }

.cs-section h2 {
    font-family: var(--font-display);
    font-size: clamp(1.6rem, 2.5vw, 2.2rem);
    font-weight: 300;
    line-height: 1.2;
    letter-spacing: -0.01em;
    margin-bottom: 1.5rem;
}
.cs-section h2 em { font-style: italic; }
.cs-section p {
    font-size: 1rem;
    line-height: 1.85;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}
.cs-section p:last-child { margin-bottom: 0; }

/* Pull quote */
.pull-quote {
    border-left: 3px solid var(--teal);
    padding: 1.5rem 2rem;
    margin: 3rem 0;
    background: var(--surface);
    border-radius: 0 var(--r-md) var(--r-md) 0;
}
.pull-quote p {
    font-family: var(--font-display);
    font-size: clamp(1.2rem, 2vw, 1.6rem);
    font-weight: 300;
    font-style: italic;
    color: var(--text);
    line-height: 1.4;
    margin: 0;
}

/* Numbered approach steps */
.approach-steps { display: flex; flex-direction: column; gap: 2rem; margin-top: 2rem; }
.step { display: grid; grid-template-columns: 3rem 1fr; gap: 1.5rem; align-items: start; }
.step-num {
    font-family: var(--font-display);
    font-size: 1.8rem;
    font-weight: 300;
    font-style: italic;
    color: rgba(13,12,9,0.15);
    line-height: 1;
    padding-top: 0.1rem;
}
.step-content h3 { font-size: 0.95rem; font-weight: 500; margin-bottom: 0.5rem; color: var(--text); }
.step-content p { font-size: 0.9rem; line-height: 1.75; color: var(--text-muted); margin: 0; }

/* Divider */
.divider { width: 40px; height: 1px; background: var(--teal); margin: 3rem 0; }

/* ===== NEXT CASE STUDY STRIP ===== */
.cs-next {
    background: var(--surface);
    padding: 4rem 3rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    text-decoration: none;
    color: inherit;
    border-top: 1px solid var(--border);
    transition: background 0.25s;
}
.cs-next:hover { background: var(--bg-alt); }
.cs-next-label {
    font-size: 0.65rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}
.cs-next-title {
    font-family: var(--font-display);
    font-size: clamp(1.2rem, 2vw, 1.6rem);
    font-weight: 300;
    max-width: 40ch;
}
.cs-next-title em { font-style: italic; }
.cs-next-arrow {
    font-size: 1.5rem;
    color: var(--text-muted);
    transition: transform 0.2s;
}
.cs-next:hover .cs-next-arrow { transform: translateX(6px); }

/* ===== FOOTER ===== */
footer {
    background: var(--bg-dark);
    color: rgba(243,237,226,0.28);
    padding: 2rem 3rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
footer span { font-size: 0.72rem; letter-spacing: 0.05em; }
footer a { color: inherit; text-decoration: none; }

/* ===== CASE STUDY 03 EXTRAS (arch diagram, code, github link) ===== */
.arch-diagram {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--r-md);
    padding: 2.5rem;
    margin: 2.5rem 0;
}
.arch-title {
    font-size: 0.68rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 2rem;
}
.arch-flow { display: flex; align-items: center; flex-wrap: wrap; gap: 0.5rem; }
.arch-node {
    background: var(--bg-dark);
    color: #F3EDE2;
    padding: 0.75rem 1.5rem;
    border-radius: var(--r-sm);
    font-size: 0.78rem;
    font-weight: 400;
    white-space: nowrap;
}
.arch-arrow { color: var(--teal); padding: 0 0.5rem; font-size: 1rem; }

/* ===== CASE STUDY 04 EXTRAS (eval table) ===== */
.eval-table {
    width: 100%;
    border-collapse: collapse;
    margin: 2rem 0;
    font-size: 0.88rem;
}
.eval-table th {
    text-align: left;
    font-size: 0.65rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-muted);
    font-weight: 500;
    padding: 0.75rem 1rem;
    border-bottom: 2px solid var(--border);
}
.eval-table td {
    padding: 0.9rem 1rem;
    border-bottom: 1px solid var(--border);
    color: var(--text-muted);
    vertical-align: top;
    line-height: 1.55;
}
.eval-table td:first-child { color: var(--text); font-weight: 400; }
.eval-table tr:last-child td { border-bottom: none; }

/* Shared GitHub CTA link */
.github-link {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    background: var(--text);
    color: var(--bg);
    padding: 0.9rem 1.75rem;
    text-decoration: none;
    font-size: 0.82rem;
    font-weight: 400;
    letter-spacing: 0.05em;
    border-radius: var(--r-sm);
    transition: background 0.2s;
    margin-top: 1rem;
}
.github-link:hover { background: var(--teal); }

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .cs-hero { grid-template-columns: 1fr; padding: 8rem 1.5rem 4rem; gap: 3rem; }
    .metrics-bar { grid-template-columns: 1fr 1fr; }
    .metric { padding: 2rem 1.5rem; }
    .metrics-bar .metric:nth-child(2) { border-right: none; }
    .metrics-bar .metric:nth-child(3) { border-top: 1px solid rgba(243,237,226,0.08); }
    .cs-body { padding: 4rem 1.5rem; }
    .arch-flow { gap: 0.5rem; }
    .arch-arrow { padding: 0 0.25rem; }
    .eval-table { display: block; overflow-x: auto; }
    .cs-next { padding: 2.5rem 1.5rem; flex-direction: column; align-items: flex-start; gap: 1.5rem; }
    footer { padding: 1.5rem; flex-direction: column; gap: 0.5rem; text-align: center; }
}