/* ============================================================
   Use Cases — bilingual showcase (Phase 2)
   ============================================================ */

.uc {
  position: relative;
  border-bottom: 1px solid var(--color-border-subtle);
  padding-block: var(--spacing-section);
  background: var(--color-bg);
  overflow: hidden;
}
@media (min-width: 1024px) { .uc { padding-block: var(--spacing-section-lg); } }

/* subtle grid bg */
.uc::before {
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(to right, var(--color-border-subtle) 1px, transparent 1px),
    linear-gradient(to bottom, var(--color-border-subtle) 1px, transparent 1px);
  background-size: 120px 120px;
  mask-image: radial-gradient(ellipse 60% 80% at 50% 30%, black 0%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 60% 80% at 50% 30%, black 0%, transparent 80%);
  opacity: 0.5;
  pointer-events: none;
}

/* ── HEADER ─────────────────────────────────────────────── */
.uc__head {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-bottom: 56px;
  position: relative;
  z-index: 2;
}
@media (min-width: 1024px) {
  .uc__head { grid-template-columns: 1fr 1fr; gap: 80px; align-items: end; margin-bottom: 80px; }
}
.uc__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}
.uc__eyebrow::before { content: ""; width: 24px; height: 1px; background: var(--color-accent); }
.uc__eyebrow .num { color: var(--color-accent); }

.uc__title {
  font-family: var(--font-display);
  font-size: clamp(40px, 5.6vw, 84px);
  font-weight: 500;
  letter-spacing: -0.04em;
  line-height: 0.95;
  color: var(--color-text-primary);
  margin: 16px 0 0;
  text-wrap: balance;
}
.uc__title .it { font-style: italic; font-weight: 400; color: var(--color-text-secondary); }
.uc__title .grad {
  background: linear-gradient(100deg, var(--color-accent) 0%, var(--color-cobalt) 80%);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
:root[data-theme="light"] .uc__title .grad {
  background: linear-gradient(100deg, #0E5C3D 0%, #1A4FA8 100%);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}

.uc__lede {
  font-size: 17px;
  line-height: 1.55;
  color: var(--color-text-secondary);
  max-width: 52ch;
  text-wrap: pretty;
  margin: 0;
}

/* ── TABS (vertical pickers) ─────────────────────────────── */
.uc__tabs {
  position: relative;
  z-index: 2;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 6px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.02);
  backdrop-filter: blur(12px);
  width: fit-content;
  max-width: 100%;
  margin-bottom: 40px;
  overflow-x: auto;
}
:root[data-theme="light"] .uc__tabs { background: rgba(0, 0, 0, 0.02); }

.uc__tab {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  border-radius: var(--radius-full);
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-secondary);
  border: 0;
  background: transparent;
  cursor: pointer;
  transition: color var(--duration-base) var(--ease-out), background-color var(--duration-base) var(--ease-out);
  white-space: nowrap;
  letter-spacing: -0.01em;
}
.uc__tab:hover { color: var(--color-text-primary); background: var(--color-surface-hover); }
.uc__tab .ico { width: 16px; height: 16px; opacity: 0.7; }
.uc__tab .num { font-family: var(--font-mono); font-size: 10px; color: var(--color-text-muted); letter-spacing: 0.06em; }
.uc__tab[aria-selected="true"] { background: var(--color-text-primary); color: var(--color-bg); }
.uc__tab[aria-selected="true"] .num { color: var(--color-bg); opacity: 0.6; }
.uc__tab[aria-selected="true"] .ico { opacity: 1; }

/* ── PANEL (one per vertical) ────────────────────────────── */
.uc__panel { display: none; position: relative; z-index: 2; }
.uc__panel.is-active { display: block; animation: uc-panel-in 500ms var(--ease-out) both; }
@keyframes uc-panel-in {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Header strip with vertical name + meta */
.uc__strip {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  padding: 20px 24px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background: linear-gradient(180deg, var(--color-bg-elevated) 0%, var(--color-bg) 100%);
  margin-bottom: 24px;
}
@media (min-width: 1024px) { .uc__strip { grid-template-columns: 1.5fr 1fr 1fr 1fr 1fr; align-items: center; } }
.uc__strip-title {
  display: flex; flex-direction: column; gap: 4px;
}
.uc__strip-title .kind {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.2em; text-transform: uppercase; color: var(--color-accent); font-weight: 600;
}
.uc__strip-title .name {
  font-family: var(--font-display); font-size: 28px; font-weight: 500; letter-spacing: -0.025em; color: var(--color-text-primary); line-height: 1;
}
.uc__metric {
  display: flex; flex-direction: column; gap: 4px;
  border-left: 1px solid var(--color-border-subtle); padding-left: 16px;
}
@media (max-width: 1023.98px) { .uc__metric { border-left: 0; padding-left: 0; padding-top: 8px; border-top: 1px solid var(--color-border-subtle); } }
.uc__metric .lbl {
  font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--color-text-muted);
}
.uc__metric .val {
  font-family: var(--font-display); font-size: 44px; font-weight: 500; letter-spacing: -0.04em; color: var(--color-text-primary); line-height: 0.95; font-variant-numeric: tabular-nums;
}
.uc__metric .val.accent {
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-cobalt) 100%);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
  color: var(--color-accent);
}
:root[data-theme="light"] .uc__metric .val.accent {
  background: linear-gradient(135deg, #0E5C3D 0%, #1A4FA8 100%);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.uc__metric .delta { font-family: var(--font-mono); font-size: 10px; color: var(--color-accent); letter-spacing: 0.04em; }

/* Bilingual transcript pair */
.uc__pair {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-bottom: 24px;
}
@media (min-width: 900px) { .uc__pair { grid-template-columns: 1fr 1fr; gap: 24px; } }

.uc__call {
  position: relative;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background: var(--color-bg-elevated);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.uc__call-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--color-border-subtle);
  background: rgba(255, 255, 255, 0.02);
}
:root[data-theme="light"] .uc__call-head { background: rgba(0,0,0,0.02); }
.uc__call-id {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--font-mono); font-size: 11px; color: var(--color-text-muted); letter-spacing: 0.06em;
}
.uc__call-id .flag {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--color-border-subtle);
  color: var(--color-text-primary);
  font-weight: 600; font-size: 10px;
}
:root[data-theme="light"] .uc__call-id .flag { background: rgba(0,0,0,0.04); }
.uc__call-id .flag svg { display: block; }

.uc__call-meta {
  display: flex; align-items: center; gap: 12px;
  font-family: var(--font-mono); font-size: 10px; color: var(--color-text-muted); letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
}
.uc__call-meta .live {
  display: inline-flex; align-items: center; gap: 5px;
  color: var(--color-accent);
}
.uc__call-meta .live::before {
  content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--color-accent); box-shadow: 0 0 6px var(--color-accent-glow);
  animation: badge-pulse 2s var(--ease-in-out) infinite;
}

/* Waveform */
.uc__wave { display: flex; align-items: center; gap: 2px; height: 14px; }
.uc__wave span {
  display: block; width: 2px; background: var(--color-accent); border-radius: 1px;
  animation: wave 1.4s var(--ease-in-out) infinite;
}
.uc__wave span:nth-child(1) { height: 30%; animation-delay: -0.2s; }
.uc__wave span:nth-child(2) { height: 70%; animation-delay: -0.4s; }
.uc__wave span:nth-child(3) { height: 100%; animation-delay: -0.6s; }
.uc__wave span:nth-child(4) { height: 60%; animation-delay: -0.8s; }
.uc__wave span:nth-child(5) { height: 40%; animation-delay: -1.0s; }
@keyframes wave {
  0%, 100% { transform: scaleY(0.4); }
  50% { transform: scaleY(1); }
}

/* Transcript body */
.uc__transcript {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  flex: 1;
  min-height: 380px;
}

.uc__msg {
  display: flex;
  flex-direction: column;
  gap: 4px;
  max-width: 86%;
}
.uc__msg-head {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-mono); font-size: 9px; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--color-text-muted);
}
.uc__msg-head .role { font-weight: 600; }
.uc__msg-head .ts { font-variant-numeric: tabular-nums; opacity: 0.7; }
.uc__msg-body {
  padding: 12px 14px;
  border-radius: 14px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--color-text-primary);
  border: 1px solid var(--color-border-subtle);
  background: var(--color-surface);
}
.uc__msg--ai { align-self: flex-start; }
.uc__msg--ai .uc__msg-head .role { color: var(--color-accent); }
.uc__msg--ai .uc__msg-body {
  border-color: rgba(124, 255, 185, 0.18);
  background: linear-gradient(180deg, var(--color-accent-subtle) 0%, var(--color-surface) 100%);
  border-bottom-left-radius: 4px;
}
.uc__msg--user { align-self: flex-end; }
.uc__msg--user .uc__msg-head { justify-content: flex-end; flex-direction: row-reverse; }
.uc__msg--user .uc__msg-body {
  background: var(--color-text-primary);
  color: var(--color-bg);
  border-color: transparent;
  border-bottom-right-radius: 4px;
}
.uc__msg--user.is-typing .uc__msg-body { background: rgba(255,255,255,0.05); color: var(--color-text-secondary); border: 1px dashed var(--color-border-strong); }
:root[data-theme="light"] .uc__msg--user.is-typing .uc__msg-body { background: rgba(0,0,0,0.05); }

.uc__msg-action {
  display: inline-flex; align-items: center; gap: 6px;
  margin-top: 6px; padding: 4px 10px;
  border-radius: var(--radius-full);
  background: var(--color-accent-subtle);
  border: 1px solid rgba(124,255,185,0.22);
  color: var(--color-accent);
  font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.06em; text-transform: uppercase;
  width: fit-content;
}
.uc__msg-action svg { width: 10px; height: 10px; }

/* Footer of call card — outcome + booking */
.uc__call-foot {
  border-top: 1px solid var(--color-border-subtle);
  padding: 14px 20px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: center;
  background: rgba(255,255,255,0.02);
}
:root[data-theme="light"] .uc__call-foot { background: rgba(0,0,0,0.02); }
.uc__outcome {
  display: flex; flex-direction: column; gap: 2px;
}
.uc__outcome .lbl { font-family: var(--font-mono); font-size: 9px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--color-text-muted); }
.uc__outcome .val { font-size: 13px; color: var(--color-text-primary); font-weight: 500; }

.uc__pill {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 12px; border-radius: var(--radius-full);
  font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.08em; text-transform: uppercase;
  background: var(--color-accent); color: var(--color-accent-ink);
  font-weight: 600;
}
.uc__pill.warning { background: var(--color-amber); }

/* Foot of panel — list of integrations */
.uc__integrations {
  display: flex; flex-wrap: wrap; gap: 10px; align-items: center;
  padding: 18px 24px;
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  background: var(--color-bg-elevated);
}
.uc__integrations .ttl {
  font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--color-text-muted);
  margin-right: 8px;
}
.uc__integrations .chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 10px; border-radius: var(--radius-md);
  background: var(--color-surface); border: 1px solid var(--color-border-subtle);
  font-family: var(--font-mono); font-size: 11px; color: var(--color-text-secondary);
  letter-spacing: 0.04em;
}
.uc__integrations .chip svg { width: 12px; height: 12px; color: var(--color-accent); }