/* ============================================================
   CUSTOMER CASES PAGE
   ============================================================ */

/* ---------- HEADER · 白色 + 斜线条纹 ---------- */
.cases-header {
  position: relative;
  background: white;
  color: var(--ink);
  overflow: hidden;
  isolation: isolate;
  border-bottom: 1px solid var(--line);
}
.ch-bg { position: absolute; inset: 0; z-index: 0; pointer-events: none; }
.ch-stripes {
  position: absolute; inset: 0;
  background-image: repeating-linear-gradient(
    135deg,
    rgba(22,80,168,.025) 0 1px,
    transparent 1px 36px
  );
}
.ch-stripes.thick { display: none; }
.ch-glow {
  position: absolute;
  width: 600px; height: 600px; border-radius: 50%;
  background: radial-gradient(closest-side, rgba(30,160,151,.10), transparent 70%);
  left: -160px; top: -180px;
  filter: blur(50px);
}
.ch-glow.b {
  right: -240px; bottom: -260px; left: auto; top: auto;
  background: radial-gradient(closest-side, rgba(22,80,168,.12), transparent 70%);
}
/* corner brackets — same blueprint language as other subpages */
.cases-header::before, .cases-header::after {
  content: "";
  position: absolute;
  width: 64px; height: 64px;
  border: 1.5px solid rgba(30,160,151,.55);
  z-index: 1;
  pointer-events: none;
}
.cases-header::before {
  top: 96px; left: 36px;
  border-right: none; border-bottom: none;
}
.cases-header::after {
  bottom: 36px; right: 36px;
  border-left: none; border-top: none;
  border-color: rgba(22,80,168,.45);
}

.ch-inner {
  position: relative; z-index: 2;
  padding: clamp(80px, 11vw, 140px) 0 clamp(70px, 9vw, 110px);
  text-align: center;
  display: flex; flex-direction: column; align-items: center;
}
.breadcrumb {
  display: flex; align-items: center; gap: 10px;
  font-size: 13px;
  margin-bottom: 28px;
  color: var(--muted);
  font-family: var(--font-en);
  letter-spacing: .04em;
}
.breadcrumb a { color: var(--ink-2); transition: color .2s; }
.breadcrumb a:hover { color: var(--blue); }
.breadcrumb .sep { color: var(--line); }
.breadcrumb .current { color: var(--blue); font-weight: 500; }

.ch-eyebrow {
  display: inline-flex;
  font-family: var(--font-en);
  font-size: 12.5px; font-weight: 600;
  letter-spacing: .18em; text-transform: uppercase;
  color: var(--green-600);
  margin-bottom: 14px;
}
.ch-title {
  font-size: clamp(28px, 4vw, 52px);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin: 0;
  color: var(--ink);
  white-space: nowrap;
}
@media (max-width: 720px) {
  .ch-title { white-space: normal; font-size: 28px; }
}
.ch-sub {
  font-size: clamp(15px, 1.3vw, 18px);
  color: var(--muted);
  margin: 22px auto 0;
  max-width: none;
  line-height: 1.65;
  white-space: nowrap;
  text-align: center;
}
@media (max-width: 1000px) {
  .ch-sub { white-space: normal; max-width: 760px; }
}
.ch-meta {
  margin-top: 36px;
  display: flex; gap: 8px; flex-wrap: wrap;
  justify-content: center;
}
.ch-tag {
  display: inline-flex; align-items: center;
  padding: 6px 14px;
  background: white;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13px;
  color: var(--ink-2);
  transition: border-color .2s, color .2s;
}
.ch-tag:hover { border-color: var(--green); color: var(--green-600); }

/* ============================================================
   CASE LIST · diagonal stripe background continues subtly
   ============================================================ */
.cases-list {
  position: relative;
  background: white;
  isolation: isolate;
  padding-top: clamp(72px, 9vw, 110px);
  padding-bottom: clamp(80px, 10vw, 120px);
}
.cases-bg {
  position: absolute; inset: 0; z-index: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    135deg,
    rgba(22,80,168,.025) 0 1px,
    transparent 1px 36px
  );
}
.cases-list .container { position: relative; z-index: 1; }

.case-block {
  background: white;
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 40px clamp(32px, 4vw, 56px) 44px;
  margin-bottom: 28px;
  position: relative;
  overflow: hidden;
  transition: box-shadow .25s, border-color .25s;
}
.case-block::before {
  /* faint diagonal stripe inside card */
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image: repeating-linear-gradient(
    135deg,
    rgba(30,160,151,.03) 0 1px,
    transparent 1px 32px
  );
  z-index: 0;
}
.case-block:hover {
  border-color: rgba(30,160,151,.3);
  box-shadow: 0 22px 50px rgba(15,30,60,.08);
}
.case-block > * { position: relative; z-index: 1; }
.case-block:last-child { margin-bottom: 0; }

.case-hd {
  display: flex; align-items: center; gap: 18px;
  padding-bottom: 18px;
  margin-bottom: 22px;
  border-bottom: 1px dashed var(--line);
  flex-wrap: wrap;
}
.case-no {
  font-family: var(--font-en);
  font-size: 12px; font-weight: 700;
  letter-spacing: .12em;
  color: white;
  background: linear-gradient(135deg, #1EA097, #1773B6);
  padding: 6px 12px;
  border-radius: 6px;
}
.case-hd-meta {
  display: flex; align-items: baseline; gap: 12px;
  flex-wrap: wrap;
}
.case-industry {
  font-size: 12.5px;
  color: var(--green-600);
  font-weight: 600;
  letter-spacing: .04em;
  padding: 4px 10px;
  background: rgba(30,160,151,.10);
  border-radius: 999px;
}
.case-client {
  font-size: 15px;
  color: white;
  font-weight: 600;
  letter-spacing: .02em;
}

.case-title {
  font-size: clamp(24px, 2.6vw, 32px);
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.01em;
  margin: 0 0 32px;
  display: flex; align-items: baseline; gap: 16px;
  flex-wrap: wrap;
  text-wrap: balance;
}
.case-title-en {
  font-family: var(--font-en);
  font-size: 14px;
  font-weight: 500;
  color: var(--muted);
  letter-spacing: .04em;
}

.case-grid {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 48px;
  align-items: start;
}

.case-col.main { min-width: 0; }
.case-section { margin-bottom: 26px; }
.case-section:last-child { margin-bottom: 0; }

.case-section-label {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 12px; font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--blue);
  font-family: var(--font-en);
  margin-bottom: 12px;
}
.case-section-label .dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 3px rgba(30,160,151,.16);
}

.case-text {
  font-size: 15px;
  color: var(--ink-2);
  line-height: 1.8;
  margin: 0 0 14px;
}
.case-text strong { color: var(--ink); font-weight: 600; }

.case-bullets {
  list-style: none;
  padding: 0;
  margin: 14px 0 0;
  display: flex; flex-direction: column;
  gap: 12px;
}
.case-bullets li {
  position: relative;
  padding: 14px 18px 14px 38px;
  background: var(--bg-soft);
  border-radius: 10px;
  font-size: 14px;
  color: var(--ink-2);
  line-height: 1.7;
  border-left: 3px solid var(--green);
}
.case-bullets li::before {
  content: "";
  position: absolute;
  left: 18px; top: 22px;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--green);
}
.case-bullets li strong { color: var(--ink); font-weight: 600; }

/* Side column · KPI stack */
.case-col.side {
  position: sticky;
  top: 92px;
  padding: 26px;
  background: linear-gradient(160deg, rgba(30,160,151,.04), rgba(22,80,168,.04));
  border: 1px solid var(--line);
  border-radius: 16px;
}
.kpi-stack {
  display: flex; flex-direction: column;
  gap: 12px;
  margin: 14px 0 20px;
}
.kpi-card {
  background: white;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px 20px;
  position: relative;
  transition: border-color .2s, transform .2s;
}
.kpi-card:hover {
  border-color: rgba(30,160,151,.32);
  transform: translateY(-2px);
}
.kpi-trend {
  font-family: var(--font-en);
  font-size: 14px; font-weight: 700;
  display: inline-block;
  width: 24px; height: 24px;
  border-radius: 50%;
  text-align: center; line-height: 24px;
  margin-bottom: 8px;
}
.kpi-trend.up   { background: rgba(30,160,151,.14); color: var(--green-600); }
.kpi-trend.down { background: rgba(220,38,38,.10); color: #DC2626; }
.kpi-v {
  display: flex; align-items: baseline; gap: 2px;
  font-family: var(--font-en);
  font-size: 32px;
  font-weight: 600;
  letter-spacing: -0.02em;
  background: var(--grad-brand);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
}
.kpi-v .num:not(:has(*)) { /* keep latin numbers as-is */ }
.kpi-v .num {
  font-family: var(--font-en);
}
.kpi-v .num:lang(zh),
.kpi-v .num.cn {
  font-family: var(--font-cn);
}
.kpi-v .u { font-size: .55em; color: var(--green-600); -webkit-text-fill-color: var(--green-600); margin-left: 2px; font-weight: 500; }
.kpi-k {
  font-size: 12.5px;
  color: var(--muted);
  margin-top: 6px;
  line-height: 1.55;
}

.kpi-card.narrative {
  display: flex; flex-direction: column;
  gap: 4px;
  padding: 16px 18px;
}
.kpi-row-icn {
  width: 32px; height: 32px;
  border-radius: 8px;
  background: rgba(30,160,151,.12);
  color: var(--green-600);
  display: grid; place-items: center;
  margin-bottom: 4px;
}
.kpi-row-title {
  font-size: 14.5px;
  font-weight: 600;
  color: var(--ink);
}
.kpi-row-desc {
  font-size: 12.5px;
  color: var(--muted);
  line-height: 1.6;
  margin-top: 2px;
}

.case-product-link {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 13px;
  color: var(--blue);
  font-weight: 500;
  padding-top: 4px;
  transition: gap .2s;
}
.case-product-link:hover { gap: 10px; }

/* CASE 04 · TBA */
.case-tba {
  background:
    linear-gradient(135deg, rgba(30,160,151,.04), rgba(22,80,168,.05)),
    white;
}
.case-tba-body {
  display: flex; gap: 22px;
  padding: 20px 0;
  align-items: flex-start;
}
.case-tba-icn {
  width: 72px; height: 72px;
  border-radius: 16px;
  background: white;
  border: 1px solid var(--line);
  color: var(--green-600);
  display: grid; place-items: center;
  flex-shrink: 0;
}
.case-tba-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 8px;
}
.case-tba-text {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.7;
  max-width: 720px;
}

/* ============================================================
   CONTACT CTA CARD · 双层错位框设计
   ============================================================ */
.contact-cta {
  margin: 80px auto 16px;
  position: relative;
  background: transparent;
  padding: 56px clamp(28px, 4vw, 60px);
  max-width: 720px;
  text-align: center;
  overflow: visible;
}
/* Inner solid frame (orange) */
.contact-cta::before {
  content: "";
  position: absolute;
  inset: 0;
  border: 1.5px solid #E07A5F;
  border-radius: 4px;
  z-index: 0;
  pointer-events: none;
}
/* Outer offset frame (light gray, bottom-right offset) */
.contact-cta::after {
  content: "";
  position: absolute;
  inset: 14px -14px -14px 14px;
  border: 1px solid var(--line);
  border-radius: 4px;
  z-index: -1;
  pointer-events: none;
}
.contact-cta-inner {
  position: relative;
  z-index: 1;
  display: flex; flex-direction: column;
  align-items: center;
  gap: 28px;
}
.contact-cta-text { width: 100%; }
.contact-cta-title {
  font-size: clamp(32px, 4.2vw, 52px);
  font-weight: 600;
  color: var(--ink);
  margin: 0;
  letter-spacing: -0.01em;
  line-height: 1.18;
  text-wrap: balance;
}
.contact-cta-sub {
  font-size: 16px;
  color: var(--muted);
  margin: 16px 0 0;
  line-height: 1.6;
}
.contact-cta-btn {
  font-size: 15px;
  padding: 13px 30px;
  background: #E07A5F !important;
  color: white !important;
  box-shadow: 0 6px 16px rgba(224,122,95,.34);
}
.contact-cta-btn:hover {
  background: #D26749 !important;
  box-shadow: 0 10px 22px rgba(224,122,95,.42);
}
@media (max-width: 640px) {
  .contact-cta { padding: 40px 22px; }
  .contact-cta::after { inset: 10px -10px -10px 10px; }
  .contact-cta-btn { width: 100%; justify-content: center; }
}
/* RESPONSIVE */
@media (max-width: 1000px) {
  .case-grid { grid-template-columns: 1fr; gap: 28px; }
  .case-col.side { position: static; }
}
@media (max-width: 640px) {
  .case-block { padding: 28px 22px 32px; }
  .case-title { font-size: 22px; }
  .case-bullets li { padding-left: 32px; }
  .case-tba-body { flex-direction: column; gap: 14px; }
}