/* =========================================
   Single Work — Case Study Layout
   K.V.D Portfolio Theme
   PC-optimized editorial case study layout
   ========================================= */

.cs {
    --cs-primary:       #FF5035;
    --cs-primary-hover: #E6402B;
    --cs-ink:           #111111;
    --cs-ink-2:         #2a2a2a;
    --cs-ink-soft:      #555555;
    --cs-ink-faint:     #999999;
    --cs-paper:         #FFFFFF;
    --cs-paper-2:       #FAFAFA;
    --cs-paper-3:       #F5F4F0;
    --cs-line:          #E5E2DD;
    --cs-gold:          #C9A96E;
    --cs-max:           1180px;
    --cs-max-narrow:    860px;
    --cs-font-jp:       "Noto Sans JP", "Helvetica Neue", Arial, sans-serif;
    --cs-font-en:       "Cormorant Garamond", "Times New Roman", serif;
    --cs-font-mono:     "JetBrains Mono", ui-monospace, monospace;

    color: var(--cs-ink);
    background: var(--cs-paper);
    line-height: 1.85;
    font-size: 16px;
    font-weight: 400;
    letter-spacing: 0.02em;
    font-family: var(--cs-font-jp);
}

.cs * { box-sizing: border-box; }
.cs img { max-width: 100%; height: auto; display: block; }
.cs a { color: inherit; text-decoration: none; transition: opacity 0.3s ease, color 0.3s ease; }

/* ──────────── Hero ──────────── */
.cs-hero {
    max-width: var(--cs-max);
    margin: 0 auto;
    padding: 100px 32px 80px;
}
.cs-hero-eyebrow {
    font-family: var(--cs-font-en);
    font-size: 13px;
    letter-spacing: 0.4em;
    color: var(--cs-primary);
    text-transform: uppercase;
    margin-bottom: 28px;
}
.cs-hero-title {
    font-size: 56px;
    font-weight: 700;
    line-height: 1.25;
    letter-spacing: -0.01em;
    margin-bottom: 28px;
    color: var(--cs-ink);
}
.cs-hero-title em {
    font-style: normal;
    color: var(--cs-primary);
}
.cs-hero-lead {
    font-size: 17px;
    line-height: 1.95;
    color: var(--cs-ink-soft);
    max-width: 720px;
    margin-bottom: 56px;
}
.cs-hero-meta {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0;
    border-top: 1px solid var(--cs-line);
    border-bottom: 1px solid var(--cs-line);
    padding: 28px 0;
}
.cs-hero-meta-item {
    padding: 0 24px;
    border-right: 1px solid var(--cs-line);
}
.cs-hero-meta-item:last-child { border-right: 0; }
.cs-hero-meta-label {
    font-family: var(--cs-font-en);
    font-size: 11px;
    letter-spacing: 0.3em;
    color: var(--cs-ink-faint);
    text-transform: uppercase;
    margin-bottom: 10px;
}
.cs-hero-meta-value {
    font-size: 14px;
    font-weight: 500;
    color: var(--cs-ink);
    line-height: 1.6;
}

/* ──────────── Hero Visual ──────────── */
.cs-hero-visual {
    max-width: var(--cs-max);
    margin: 0 auto 120px;
    padding: 0 32px;
}
.cs-hero-visual-frame {
    background: linear-gradient(135deg, #1a1410 0%, #2a1f17 100%);
    border-radius: 8px;
    padding: 60px 40px;
    display: grid;
    grid-template-columns: 1fr 1.4fr;
    gap: 40px;
    align-items: center;
    box-shadow: 0 30px 80px -20px rgba(0,0,0,0.25);
}
.cs-hero-visual-mobile {
    max-width: 280px;
    margin: 0 auto;
    border-radius: 28px;
    overflow: hidden;
    box-shadow: 0 20px 50px -10px rgba(0,0,0,0.5);
    border: 6px solid #1a1410;
}
.cs-hero-visual-text { color: #f7f3ec; }
.cs-hero-visual-text-eyebrow {
    font-family: var(--cs-font-en);
    font-size: 12px;
    letter-spacing: 0.4em;
    color: #C9A96E;
    margin-bottom: 16px;
    text-transform: uppercase;
}
.cs-hero-visual-text-title {
    font-size: 28px;
    line-height: 1.55;
    font-weight: 500;
    margin-bottom: 20px;
    color: #f7f3ec;
}
.cs-hero-visual-text-body {
    font-size: 14px;
    line-height: 2;
    color: #d8d2c4;
    max-width: 460px;
}

/* ──────────── Section base ──────────── */
.cs-block {
    max-width: var(--cs-max);
    margin: 0 auto;
    padding: 80px 32px;
}
.cs-block-narrow { max-width: var(--cs-max-narrow); }
.cs-block-bg { background: var(--cs-paper-2); }
.cs-block-bg .cs-block-inner {
    max-width: var(--cs-max);
    margin: 0 auto;
    padding: 100px 32px;
}

.cs-section-num {
    font-family: var(--cs-font-en);
    font-size: 13px;
    letter-spacing: 0.4em;
    color: var(--cs-primary);
    text-transform: uppercase;
    margin-bottom: 20px;
}
.cs-section-title {
    font-size: 36px;
    font-weight: 700;
    line-height: 1.4;
    letter-spacing: -0.005em;
    margin-bottom: 36px;
    color: var(--cs-ink);
}
.cs-section-lead {
    font-size: 16px;
    line-height: 2.05;
    color: var(--cs-ink-soft);
    margin-bottom: 48px;
    max-width: 760px;
}

/* ──────────── Notice ──────────── */
.cs-notice {
    max-width: var(--cs-max);
    margin: 0 auto 60px;
    padding: 0 32px;
}
.cs-notice-inner {
    background: #FFF7F3;
    border-left: 3px solid var(--cs-primary);
    padding: 18px 28px;
    font-size: 13px;
    line-height: 1.85;
    color: var(--cs-ink-soft);
}
.cs-notice-inner strong {
    color: var(--cs-ink);
    font-weight: 600;
}

/* ──────────── Two-col (Why) ──────────── */
.cs-two-col {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 60px;
    align-items: start;
    margin-bottom: 28px;
}
.cs-two-col-label {
    font-family: var(--cs-font-en);
    font-size: 12px;
    letter-spacing: 0.35em;
    color: var(--cs-ink-faint);
    text-transform: uppercase;
    padding-top: 8px;
}
.cs-two-col-body p {
    font-size: 16px;
    line-height: 2;
    color: var(--cs-ink-2);
    margin-bottom: 20px;
}
.cs-two-col-body p:last-child { margin-bottom: 0; }

/* ──────────── Roles ──────────── */
.cs-roles {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-top: 48px;
}
.cs-role {
    border: 1px solid var(--cs-line);
    border-radius: 4px;
    padding: 32px 24px;
    background: var(--cs-paper);
    transition: border-color 0.3s ease, transform 0.3s ease;
}
.cs-role:hover {
    border-color: var(--cs-primary);
    transform: translateY(-4px);
}
.cs-role-num {
    font-family: var(--cs-font-en);
    font-size: 32px;
    font-weight: 400;
    color: var(--cs-primary);
    line-height: 1;
    margin-bottom: 16px;
}
.cs-role-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--cs-ink);
}
.cs-role-sub {
    font-family: var(--cs-font-en);
    font-size: 11px;
    letter-spacing: 0.25em;
    color: var(--cs-ink-faint);
    text-transform: uppercase;
    margin-bottom: 16px;
}
.cs-role-body {
    font-size: 13px;
    line-height: 1.85;
    color: var(--cs-ink-soft);
}

/* ──────────── Screens ──────────── */
.cs-screens {
    display: grid;
    grid-template-columns: 1fr;
    gap: 80px;
    margin-top: 48px;
}
.cs-screen {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 48px;
    align-items: center;
}
.cs-screen-text-side { padding: 16px 0; }
.cs-screen-num {
    font-family: var(--cs-font-en);
    font-size: 13px;
    letter-spacing: 0.4em;
    color: var(--cs-primary);
    margin-bottom: 14px;
    text-transform: uppercase;
}
.cs-screen-title {
    font-size: 24px;
    font-weight: 600;
    line-height: 1.45;
    margin-bottom: 16px;
    color: var(--cs-ink);
}
.cs-screen-body {
    font-size: 14.5px;
    line-height: 2;
    color: var(--cs-ink-soft);
    margin-bottom: 24px;
}
.cs-screen-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}
.cs-screen-tag {
    font-size: 11px;
    letter-spacing: 0.05em;
    padding: 4px 12px;
    border: 1px solid var(--cs-line);
    border-radius: 99px;
    color: var(--cs-ink-soft);
    background: var(--cs-paper);
}
.cs-screen-img {
    border: 1px solid var(--cs-line);
    border-radius: 6px;
    overflow: hidden;
    background: var(--cs-paper);
    box-shadow: 0 12px 36px -12px rgba(0,0,0,0.12);
}
.cs-screen-img-mobile {
    max-width: 280px;
    margin: 0;
    border-radius: 22px;
    border: 5px solid #1a1410;
    box-shadow: 0 16px 40px -10px rgba(0,0,0,0.25);
    overflow: hidden;
    background: #1a1410;
}
.cs-screen-pc-shot {
    grid-column: 1 / -1;
}

.cs-inline-code {
    font-family: var(--cs-font-mono);
    font-size: 13px;
    color: var(--cs-ink);
    background: var(--cs-paper-3);
    padding: 2px 8px;
    border-radius: 3px;
}

/* ──────────── Stack ──────────── */
.cs-stack-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    background: var(--cs-line);
    border: 1px solid var(--cs-line);
    border-radius: 4px;
    overflow: hidden;
}
.cs-stack-item {
    background: var(--cs-paper);
    padding: 32px 28px;
}
.cs-stack-label {
    font-family: var(--cs-font-en);
    font-size: 11px;
    letter-spacing: 0.3em;
    color: var(--cs-ink-faint);
    text-transform: uppercase;
    margin-bottom: 12px;
}
.cs-stack-name {
    font-family: var(--cs-font-mono);
    font-size: 15px;
    font-weight: 500;
    color: var(--cs-ink);
    margin-bottom: 6px;
}
.cs-stack-note {
    font-size: 12px;
    color: var(--cs-ink-soft);
    line-height: 1.7;
}

/* ──────────── Highlights ──────────── */
.cs-highlights {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    margin-top: 48px;
}
.cs-highlight {
    padding: 36px;
    background: var(--cs-paper);
    border: 1px solid var(--cs-line);
    border-radius: 4px;
}
.cs-highlight-num {
    font-family: var(--cs-font-en);
    font-size: 24px;
    color: var(--cs-primary);
    margin-bottom: 14px;
    letter-spacing: 0.05em;
}
.cs-highlight-title {
    font-size: 17px;
    font-weight: 600;
    margin-bottom: 14px;
    color: var(--cs-ink);
}
.cs-highlight-body {
    font-size: 14px;
    line-height: 1.95;
    color: var(--cs-ink-soft);
}

/* ──────────── Application ──────────── */
.cs-app-block {
    background: linear-gradient(135deg, #FFF7F3 0%, #FFEFE9 100%);
    border-radius: 6px;
    padding: 64px 56px;
    margin-top: 48px;
}
.cs-app-block-title {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--cs-ink);
}
.cs-app-block-lead {
    font-size: 15px;
    line-height: 2;
    color: var(--cs-ink-2);
    margin-bottom: 32px;
    max-width: 720px;
}
.cs-app-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px 32px;
    list-style: none;
    padding: 0;
    margin: 0;
}
.cs-app-item {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    padding: 12px 0;
}
.cs-app-item-mark {
    flex-shrink: 0;
    width: 6px; height: 6px;
    border-radius: 99px;
    background: var(--cs-primary);
    margin-top: 12px;
}
.cs-app-item-text {
    font-size: 14.5px;
    line-height: 1.85;
    color: var(--cs-ink-2);
}
.cs-app-item-text strong {
    font-weight: 600;
    color: var(--cs-ink);
}

/* ──────────── Bottom CTA ──────────── */
.cs-bottom-cta {
    max-width: var(--cs-max);
    margin: 80px auto;
    padding: 80px 32px;
    text-align: center;
    border-top: 1px solid var(--cs-line);
    border-bottom: 1px solid var(--cs-line);
}
.cs-bottom-cta-eyebrow {
    font-family: var(--cs-font-en);
    font-size: 12px;
    letter-spacing: 0.4em;
    color: var(--cs-primary);
    text-transform: uppercase;
    margin-bottom: 20px;
}
.cs-bottom-cta-title {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 20px;
    line-height: 1.55;
    color: var(--cs-ink);
}
.cs-bottom-cta-lead {
    font-size: 15px;
    color: var(--cs-ink-soft);
    margin-bottom: 36px;
    line-height: 2;
}
.cs-btn {
    display: inline-block;
    padding: 16px 44px;
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 0.08em;
    border-radius: 99px;
    transition: all 0.3s ease;
}
.cs a.cs-btn-primary { background: var(--cs-ink); color: var(--cs-paper); -webkit-text-fill-color: var(--cs-paper); }
.cs a.cs-btn-primary:hover { background: var(--cs-primary); color: var(--cs-paper); -webkit-text-fill-color: var(--cs-paper); }
.cs a.cs-btn-secondary { border: 1px solid var(--cs-line); color: var(--cs-ink); -webkit-text-fill-color: var(--cs-ink); margin-left: 12px; }
.cs a.cs-btn-secondary:hover { border-color: var(--cs-ink); }

/* ──────────── Responsive ──────────── */
@media (max-width: 980px) {
    .cs-hero-title { font-size: 38px; }
    .cs-hero-meta { grid-template-columns: repeat(2, 1fr); gap: 1px; }
    .cs-hero-meta-item:nth-child(2) { border-right: 0; }
    .cs-hero-meta-item { padding: 16px 20px; }
    .cs-hero-visual-frame { grid-template-columns: 1fr; padding: 40px 24px; }
    .cs-roles { grid-template-columns: repeat(2, 1fr); }
    .cs-screen { grid-template-columns: 1fr; gap: 24px; }
    .cs-screen-img-mobile { max-width: 240px; margin: 0 auto; }
    .cs-stack-grid { grid-template-columns: repeat(2, 1fr); }
    .cs-highlights, .cs-app-list { grid-template-columns: 1fr; }
    .cs-two-col { grid-template-columns: 1fr; gap: 12px; }
    .cs-section-title { font-size: 26px; }
}
@media (max-width: 600px) {
    .cs-hero { padding: 60px 20px 50px; }
    .cs-hero-title { font-size: 30px; }
    .cs-hero-visual { padding: 0 16px; margin-bottom: 60px; }
    .cs-block, .cs-block-bg .cs-block-inner { padding: 60px 20px; }
    .cs-stack-grid { grid-template-columns: 1fr; }
    .cs-roles { grid-template-columns: 1fr; }
    .cs-app-block { padding: 40px 24px; }
}