/* ===========================================================================
   Sputnik X — Data Chat (Phase 3 operator data-chat)

   Hand-written, strict-CSP-safe. NO Tailwind CDN, NO Google Fonts, NO webfont
   icons — self-hosted Inter (reuse content-center woff2) + inline SVG sprite +
   external JS only. Material-3 dark tokens copied verbatim from content-center
   so the operator surfaces share one colour identity.
   =========================================================================== */

/* ── Self-hosted Inter (reuse Content Center's woff2; font-src 'self') ── */
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('/content-center/fonts/inter-400.woff2') format('woff2');
}
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('/content-center/fonts/inter-600.woff2') format('woff2');
}
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('/content-center/fonts/inter-900.woff2') format('woff2');
}

/* ── Material-3 dark tokens (shared with Content Center) ── */
:root {
  --dc-surface: #0e1416;
  --dc-surface-container-lowest: #090f11;
  --dc-surface-container-low: #161d1e;
  --dc-surface-container: #1a2122;
  --dc-surface-container-high: #242b2d;
  --dc-surface-container-highest: #2f3638;
  --dc-surface-bright: #343a3c;
  --dc-on-surface: #dde4e5;
  --dc-on-surface-variant: #bbc9cd;
  --dc-outline: #859397;
  --dc-outline-variant: #3c494c;
  --dc-primary: #8aebff;
  --dc-primary-container: #22d3ee;
  --dc-on-primary-container: #005763;
  --dc-secondary: #73d4e8;
  --dc-tertiary: #ffd6a3;
  --dc-tertiary-container: #ffb13b;
  --dc-error: #ffb4ab;

  --dc-sig: #6fd49a;
  --dc-sig-bg: #173a2a;
  --dc-nosig: #9fadb1;
  --dc-nosig-bg: #20292b;
  --dc-refusal-border: #5e3536;

  --dc-radius: 12px;
  --dc-radius-sm: 8px;
  --dc-header-h: 64px;
}

* {
  box-sizing: border-box;
}

body.dc-shell {
  margin: 0;
  background: var(--dc-surface);
  color: var(--dc-on-surface);
  font-family:
    'Inter',
    system-ui,
    -apple-system,
    sans-serif;
  font-size: 14px;
  line-height: 1.5;
  overflow-x: hidden;
}

.dc-icon {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
  display: inline-block;
  vertical-align: middle;
}
.dc-icon-lg {
  width: 40px;
  height: 40px;
}
.dc-icon-sm {
  width: 15px;
  height: 15px;
}

/* ── Header ── */
.dc-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--dc-header-h);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 24px;
  background: rgba(14, 20, 22, 0.72);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--dc-outline-variant);
  z-index: 50;
}
.dc-title-icon {
  color: var(--dc-primary);
}
.dc-title {
  font-size: 18px;
  font-weight: 700;
  margin: 0;
  letter-spacing: -0.01em;
}
.dc-header-spacer {
  flex: 1;
}
.dc-operator-tag {
  font-size: 12px;
  font-weight: 600;
  color: var(--dc-on-primary-container);
  background: var(--dc-primary);
  padding: 4px 10px;
  border-radius: 999px;
}
.dc-hdr-link {
  font-size: 13px;
  color: var(--dc-secondary);
  text-decoration: none;
  font-weight: 600;
}
.dc-hdr-link:hover {
  text-decoration: underline;
}

/* ── Main column ── */
.dc-main {
  max-width: 880px;
  margin: 0 auto;
  padding: calc(var(--dc-header-h) + 16px) 16px 16px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Auth gate ── */
.dc-gate {
  margin: 48px auto;
  max-width: 460px;
  text-align: center;
  background: var(--dc-surface-container-low);
  border: 1px solid var(--dc-outline-variant);
  border-radius: var(--dc-radius);
  padding: 36px 28px;
  color: var(--dc-on-surface-variant);
}
.dc-gate h3 {
  color: var(--dc-on-surface);
  margin: 16px 0 8px;
}
.dc-gate p {
  margin: 0 0 20px;
  font-size: 13px;
}
.dc-signin-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--dc-primary);
  color: var(--dc-on-primary-container);
  font-weight: 600;
  text-decoration: none;
  padding: 10px 18px;
  border-radius: 999px;
}

/* ── Conversation surface ── */
.dc-surface {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

/* sample-question hints */
.dc-hints {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 4px 4px 12px;
  flex-wrap: wrap;
}
.dc-hints-lead {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 600;
  color: var(--dc-tertiary);
  white-space: nowrap;
  padding-top: 5px;
}
.dc-hints-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  flex: 1;
}
.dc-hint {
  font-family: inherit;
  font-size: 12px;
  color: var(--dc-on-surface-variant);
  background: var(--dc-surface-container);
  border: 1px solid var(--dc-outline-variant);
  border-radius: 999px;
  padding: 6px 12px;
  cursor: pointer;
  transition:
    border-color 0.15s,
    color 0.15s;
}
.dc-hint:hover {
  border-color: var(--dc-primary);
  color: var(--dc-primary);
}

/* thread */
.dc-thread {
  flex: 1;
  overflow-y: auto;
  padding: 8px 4px 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-height: 240px;
}
.dc-empty {
  margin: auto;
  text-align: center;
  color: var(--dc-outline);
  max-width: 380px;
}
.dc-empty p {
  font-size: 13px;
}

.dc-msg {
  display: flex;
}
.dc-msg-q {
  justify-content: flex-end;
}
.dc-msg-a {
  justify-content: flex-start;
}
.dc-bubble {
  max-width: 78%;
  padding: 10px 14px;
  border-radius: var(--dc-radius);
}
.dc-bubble-q {
  background: var(--dc-primary-container);
  color: #00272d;
  border-bottom-right-radius: 4px;
  font-weight: 500;
}

/* ── Answer cards ── */
.dc-card {
  max-width: 100%;
  width: 100%;
  background: var(--dc-surface-container-low);
  border: 1px solid var(--dc-outline-variant);
  border-radius: var(--dc-radius);
  padding: 16px;
  border-bottom-left-radius: 4px;
}
.dc-card-clarify {
  border-color: var(--dc-tertiary-container);
}
.dc-card-refusal {
  border-color: var(--dc-refusal-border);
}
.dc-card-head {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
}
.dc-card-kind {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--dc-on-surface-variant);
}
.dc-icon-info {
  color: var(--dc-tertiary);
}
.dc-icon-block {
  color: var(--dc-error);
}
.dc-card-title {
  margin: 0 0 12px;
  font-size: 16px;
  font-weight: 700;
  color: var(--dc-on-surface);
  letter-spacing: -0.01em;
}
.dc-card-text {
  margin: 8px 0 0;
  font-size: 14px;
  color: var(--dc-on-surface-variant);
}

/* chart boxes */
.dc-chart-box {
  position: relative;
  height: 240px;
  margin: 4px 0 12px;
  background: var(--dc-surface-container-lowest);
  border: 1px solid var(--dc-outline-variant);
  border-radius: var(--dc-radius-sm);
  padding: 8px;
}
.dc-chart-box-scatter {
  height: 260px;
}
.dc-canvas {
  width: 100% !important;
  height: 100% !important;
}

/* meta chips */
.dc-card-meta {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin: 8px 0 0;
}
.dc-chip {
  font-size: 11px;
  font-weight: 600;
  color: var(--dc-on-surface-variant);
  background: var(--dc-surface-container-high);
  border-radius: 999px;
  padding: 3px 9px;
}

/* stats line + significance badge (correlate) */
.dc-stats-line {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin: 4px 0 0;
}
.dc-stats-code {
  font-family: ui-monospace, 'SF Mono', Menlo, monospace;
  font-size: 12px;
  color: var(--dc-on-surface);
  background: var(--dc-surface-container);
  border: 1px solid var(--dc-outline-variant);
  border-radius: var(--dc-radius-sm);
  padding: 6px 10px;
}
.dc-badge {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-radius: 999px;
  padding: 4px 10px;
}
.dc-badge-sig {
  color: var(--dc-sig);
  background: var(--dc-sig-bg);
}
.dc-badge-nosig {
  color: var(--dc-nosig);
  background: var(--dc-nosig-bg);
}

/* mandatory descriptive-only disclaimer (correlate) */
.dc-disclaimer {
  display: flex;
  align-items: center;
  gap: 6px;
  margin: 12px 0 0;
  padding: 8px 10px;
  font-size: 12px;
  font-weight: 600;
  color: var(--dc-tertiary);
  background: var(--dc-surface-container);
  border-left: 3px solid var(--dc-tertiary-container);
  border-radius: var(--dc-radius-sm);
}

/* card footer (article button) */
.dc-card-foot {
  display: flex;
  justify-content: flex-end;
  margin: 14px 0 0;
}

/* ── Buttons ── */
.dc-btn {
  font-family: inherit;
  font-size: 13px;
  font-weight: 600;
  border-radius: 999px;
  padding: 8px 14px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid transparent;
}
.dc-btn:disabled {
  opacity: 0.55;
  cursor: default;
}
.dc-btn-outline {
  background: transparent;
  border-color: var(--dc-outline);
  color: var(--dc-on-surface);
}
.dc-btn-outline:hover:not(:disabled) {
  border-color: var(--dc-primary);
  color: var(--dc-primary);
}

/* ── Composer ── */
.dc-composer {
  display: flex;
  align-items: flex-end;
  gap: 10px;
  padding: 12px;
  margin-top: 8px;
  background: var(--dc-surface-container-low);
  border: 1px solid var(--dc-outline-variant);
  border-radius: var(--dc-radius);
  position: sticky;
  bottom: 8px;
}
.dc-input {
  flex: 1;
  resize: none;
  font-family: inherit;
  font-size: 14px;
  line-height: 1.45;
  color: var(--dc-on-surface);
  background: transparent;
  border: none;
  outline: none;
  max-height: 160px;
  padding: 8px 6px;
}
.dc-input::placeholder {
  color: var(--dc-outline);
}
.dc-send {
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  background: var(--dc-primary);
  color: var(--dc-on-primary-container);
  border: none;
  border-radius: 999px;
  padding: 10px 16px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
}
.dc-send:disabled {
  opacity: 0.5;
  cursor: default;
}

/* ── Toast ── */
.dc-toast {
  position: fixed;
  left: 50%;
  bottom: 28px;
  transform: translateX(-50%);
  background: var(--dc-surface-container-highest);
  color: var(--dc-on-surface);
  border: 1px solid var(--dc-outline-variant);
  border-radius: var(--dc-radius-sm);
  padding: 10px 16px;
  font-size: 13px;
  z-index: 80;
  max-width: 90vw;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

@media (max-width: 600px) {
  .dc-main {
    padding-left: 10px;
    padding-right: 10px;
  }
  .dc-bubble {
    max-width: 90%;
  }
  .dc-hints-lead {
    width: 100%;
  }
}