/* ai·radar · Trang Đọc Bản Tin Buổi Sáng (ban-tin.css)
   Tuân thủ "Bento kiểu Apple" (Keynote posture) từ docs/ngon-ngu-thiet-ke.md và tokens.css.
   - Ít ô, ô lớn, số to.
   - Thang số riêng biệt, tabular-nums, tracking -0.04em.
   - Khoảng thở 24-48px, góc bo ô 24px.
   - Độ sâu: ô sáng hơn nền, không viền tĩnh, chỉ nâng bóng khi tương tác.
   - Chữ Be Vietnam Pro duy nhất, line-height 1.55 cho dấu tiếng Việt.
   - Không dùng gạch ngang em-dash trong giao diện hiển thị. */

/* ---------- Reset & Base ---------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--family);
  font-size: 16px;
  line-height: var(--leading-body);
  background-color: var(--color-canvas);
  color: var(--color-ink);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* Accessibility skip link */
.skip {
  position: absolute;
  top: -100px;
  left: var(--space-16);
  background: var(--color-accent);
  color: var(--color-on-accent);
  padding: var(--space-8) var(--space-16);
  border-radius: var(--radius-8);
  font-weight: var(--weight-medium);
  font-size: var(--text-small);
  text-decoration: none;
  z-index: 999;
  transition: top var(--motion-feedback) var(--ease-press);
}
.skip:focus {
  top: var(--space-16);
  outline: var(--focus-ring);
  outline-offset: var(--focus-offset);
}

.sr {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* General Icons */
.i {
  width: 1.25em;
  height: 1.25em;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
  vertical-align: -0.2em;
  flex-shrink: 0;
}

/* Number typography */
.num {
  font-family: var(--family);
  font-variant-numeric: tabular-nums;
  letter-spacing: var(--tracking-number);
  font-weight: var(--weight-bold);
}

/* ---------- Top Bar ---------- */
.bt-bar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--bar-h);
  padding: 0 var(--page-pad);
  background-color: var(--color-canvas);
  border-bottom: 1px solid var(--color-hair);
}

.bt-brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-8);
  text-decoration: none;
  color: var(--color-ink);
  font-size: var(--size-18);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-display);
}
.bt-brand b {
  color: var(--color-accent);
}
.bt-brand-badge {
  font-size: var(--size-12);
  font-weight: var(--weight-semibold);
  background-color: var(--color-fill);
  color: var(--color-ink-2);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  letter-spacing: normal;
}
.bt-brand:focus-visible {
  outline: var(--focus-ring);
  outline-offset: var(--focus-offset);
  border-radius: var(--radius-8);
}

/* Date Stepper in Header */
.bt-date-stepper {
  display: inline-flex;
  align-items: center;
  gap: var(--space-4);
  background-color: var(--color-surface);
  padding: 2px 4px;
  border-radius: var(--radius-full);
  box-shadow: 0 1px 3px oklch(var(--shadow-tint) / 0.05);
}

.bt-nav-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: none;
  background: transparent;
  color: var(--color-ink);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: background-color var(--motion-feedback) var(--ease-press),
              color var(--motion-feedback) var(--ease-press);
}
.bt-nav-btn:hover:not(:disabled) {
  background-color: var(--color-fill);
  color: var(--color-accent);
}
.bt-nav-btn:disabled {
  opacity: 0.25;
  cursor: not-allowed;
}
.bt-nav-btn:focus-visible {
  outline: var(--focus-ring);
  outline-offset: var(--focus-offset);
}

.bt-current-date-btn {
  border: none;
  background: transparent;
  font-family: inherit;
  font-size: var(--size-13);
  font-weight: var(--weight-semibold);
  color: var(--color-ink);
  padding: 0 var(--space-8);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: var(--space-4);
  border-radius: var(--radius-full);
  height: 32px;
}
.bt-current-date-btn:hover {
  background-color: var(--color-fill);
}
.bt-current-date-btn:focus-visible {
  outline: var(--focus-ring);
  outline-offset: var(--focus-offset);
}

/* Theme Toggle Button */
.bt-bar-actions {
  display: flex;
  align-items: center;
  gap: var(--space-12);
}

.theme {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: none;
  background: transparent;
  color: var(--color-ink-2);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: background-color var(--motion-feedback) var(--ease-press),
              color var(--motion-feedback) var(--ease-press);
}
.theme:hover {
  background-color: var(--color-fill);
  color: var(--color-ink);
}
.theme:focus-visible {
  outline: var(--focus-ring);
  outline-offset: var(--focus-offset);
}
.theme .i-moon { display: none; }
[data-theme="dark"] .theme .i-sun { display: none; }
[data-theme="dark"] .theme .i-moon { display: block; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme .i-sun { display: none; }
  :root:not([data-theme="light"]) .theme .i-moon { display: block; }
}

/* ---------- Main Layout ---------- */
.bt-main {
  width: 100%;
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 0 var(--page-pad);
  flex: 1;
}

/* ---------- Masthead ---------- */
.bt-masthead {
  padding: var(--space-48) 0 var(--space-32) 0;
  max-width: 960px;
}

.bt-kicker-row {
  display: flex;
  align-items: center;
  gap: var(--space-12);
  margin-bottom: var(--space-8);
}

.bt-kicker {
  font-size: var(--size-12);
  font-weight: var(--weight-bold);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
}

.bt-freeze-badge {
  font-size: var(--size-12);
  color: var(--color-ink-3);
  font-weight: var(--weight-medium);
}

.bt-title {
  font-size: var(--text-lead);
  font-weight: var(--weight-bold);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-display);
  color: var(--color-ink);
  margin: var(--space-8) 0 var(--space-12) 0;
  text-wrap: balance;
}

.bt-subtitle {
  font-size: var(--size-16);
  line-height: var(--leading-body);
  color: var(--color-ink-2);
  max-width: 65ch;
  text-wrap: pretty;
}

.bt-meta-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-8);
  margin-top: var(--space-16);
}

.bt-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-6);
  height: var(--chip-h);
  padding: 0 var(--space-12);
  background-color: var(--color-surface);
  border-radius: var(--radius-full);
  font-size: var(--size-13);
  font-weight: var(--weight-medium);
  color: var(--color-ink-2);
}
.bt-chip .i {
  color: var(--color-accent);
}

/* ---------- Bento Grid ---------- */
.bt-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--grid-gap);
  margin-top: var(--space-16);
  margin-bottom: var(--space-64);
}

/* Bento Tile Card */
.bt-tile {
  grid-column: span 12;
  background-color: var(--color-surface);
  border-radius: var(--tile-radius);
  padding: var(--tile-pad);
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform var(--duration-250) var(--ease-flow),
              box-shadow var(--duration-250) var(--ease-flow);
}
.bt-tile:hover {
  transform: translateY(var(--tile-hover-lift));
  box-shadow: var(--shadow-lift);
}

/* Lead or Hero Story */
.bt-tile-lead {
  grid-column: span 12;
  padding: var(--tile-pad-hero);
}

/* Grid layout when multiple stories exist */
@media (min-width: 860px) {
  .bt-grid:not(.is-single) .bt-tile:not(.bt-tile-lead) {
    grid-column: span 6;
  }
}

/* Tile Meta Header */
.bt-tile-head {
  display: flex;
  align-items: center;
  gap: var(--space-12);
  margin-bottom: var(--space-16);
  flex-wrap: wrap;
}

.bt-source-info {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.bt-source-name {
  font-size: var(--size-14);
  font-weight: var(--weight-semibold);
  color: var(--color-ink);
}

.bt-story-kind {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: var(--size-12);
  font-weight: var(--weight-medium);
  color: var(--color-ink-3);
  background-color: var(--color-fill);
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

.bt-published-time {
  font-size: var(--size-12);
  color: var(--color-ink-3);
  margin-left: auto;
}

/* Story Headline */
.bt-story-title {
  font-size: var(--text-feature);
  font-weight: var(--weight-semibold);
  line-height: var(--leading-snug);
  letter-spacing: var(--tracking-display);
  color: var(--color-ink);
  margin-bottom: var(--space-8);
  text-wrap: balance;
}
.bt-tile-lead .bt-story-title {
  font-size: var(--text-lead);
  font-weight: var(--weight-bold);
}
.bt-story-title a {
  color: inherit;
  text-decoration: none;
}
.bt-story-title a:hover {
  color: var(--color-accent);
}
.bt-story-title a:focus-visible {
  outline: var(--focus-ring);
  outline-offset: var(--focus-offset);
  border-radius: var(--radius-8);
}

/* Original Title (Machine Translated Line) */
.orig {
  display: inline-flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-8);
  font-size: var(--size-13);
  color: var(--color-ink-3);
  margin-bottom: var(--space-16);
  line-height: 1.4;
}
.orig .mt {
  background-color: var(--color-mt-bg);
  color: var(--color-mt-ink);
  font-size: 11px;
  font-weight: var(--weight-semibold);
  padding: 2px 6px;
  border-radius: 4px;
  letter-spacing: 0.02em;
  flex-shrink: 0;
}

/* Summary paragraph */
.bt-story-summary {
  font-size: var(--size-16);
  line-height: var(--leading-body);
  color: var(--color-ink-2);
  margin-bottom: var(--space-24);
  max-width: 70ch;
  text-wrap: pretty;
}

/* Selection Reasons Panel */
.bt-reasons-box {
  background-color: var(--color-inset);
  border-radius: var(--inner-radius);
  padding: var(--space-16) var(--space-24);
  margin-bottom: var(--space-24);
}

.bt-reasons-head {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  font-size: var(--size-12);
  font-weight: var(--weight-bold);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-accent);
  margin-bottom: var(--space-8);
}

.bt-reasons-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.bt-reasons-list li {
  font-size: var(--size-14);
  line-height: 1.45;
  color: var(--color-ink);
  position: relative;
  padding-left: var(--space-16);
}
.bt-reasons-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-accent);
}

/* Measured Numbers Section */
.bt-numbers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: var(--space-16);
  margin-bottom: var(--space-24);
  padding-bottom: var(--space-24);
  border-bottom: 1px solid var(--color-hair);
}
.bt-numbers-grid:empty {
  display: none;
}

.bt-num-item {
  display: flex;
  flex-direction: column;
}

.bt-num-val {
  font-size: var(--num-md);
  color: var(--color-ink);
  line-height: 1.05;
}
.bt-tile-lead .bt-num-val {
  font-size: var(--num-lg);
}

.bt-num-lbl {
  font-size: var(--size-12);
  font-weight: var(--weight-medium);
  color: var(--color-ink-3);
  margin-top: var(--space-4);
  line-height: 1.3;
}

/* Actions Footer */
.bt-tile-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-16);
  flex-wrap: wrap;
  margin-top: auto;
}

.bt-btn-primary {
  display: inline-flex;
  align-items: center;
  gap: var(--space-8);
  height: var(--btn-h);
  padding: 0 var(--space-24);
  background-color: var(--color-accent);
  color: var(--color-on-accent);
  border-radius: var(--radius-full);
  font-size: var(--size-14);
  font-weight: var(--weight-semibold);
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: transform var(--motion-feedback) var(--ease-press),
              opacity var(--motion-feedback) var(--ease-press);
}
.bt-btn-primary:hover {
  opacity: 0.94;
}
.bt-btn-primary:active {
  transform: scale(0.98);
}
.bt-btn-primary:focus-visible {
  outline: var(--focus-ring);
  outline-offset: var(--focus-offset);
}

.bt-sources-list {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  flex-wrap: wrap;
}
.bt-sources-label {
  font-size: var(--size-13);
  color: var(--color-ink-3);
}
.bt-source-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: var(--size-13);
  color: var(--color-accent);
  text-decoration: none;
}
.bt-source-link:hover {
  text-decoration: underline;
}
.bt-source-link:focus-visible {
  outline: var(--focus-ring);
  outline-offset: var(--focus-offset);
  border-radius: var(--radius-8);
}

/* Avatar styling matching faces.js */
.av {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--av-radius);
  overflow: hidden;
  background-color: var(--color-fill);
  flex-shrink: 0;
  vertical-align: middle;
}
.av-sm { width: var(--av-sm); height: var(--av-sm); }
.av-md { width: var(--av-md); height: var(--av-md); }
.av-lg { width: var(--av-lg); height: var(--av-lg); }

.av.is-fallback::before {
  content: attr(data-mono);
  font-weight: var(--weight-bold);
  font-size: var(--av-text-md);
  color: oklch(var(--av-mono-ink));
  background-color: oklch(var(--av-mono-bg) var(--mono-h, 265));
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  text-transform: uppercase;
}
.av-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ---------- Honest Status States (Empty, Missing, Error) ---------- */
.bt-tile-status {
  grid-column: span 12;
  padding: var(--space-48) var(--space-32);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.bt-status-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-full);
  background-color: var(--color-fill);
  color: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-24);
}
.bt-status-icon .i {
  width: 32px;
  height: 32px;
}
.bt-status-icon.is-warn {
  color: var(--color-warn);
  background-color: var(--color-warn-wash);
}

.bt-status-title {
  font-size: var(--text-feature);
  font-weight: var(--weight-bold);
  color: var(--color-ink);
  margin-bottom: var(--space-12);
  text-wrap: balance;
}

.bt-status-text {
  font-size: var(--size-16);
  line-height: var(--leading-body);
  color: var(--color-ink-2);
  max-width: 58ch;
  margin-bottom: var(--space-24);
  text-wrap: pretty;
}

.bt-status-health {
  display: inline-flex;
  align-items: center;
  gap: var(--space-8);
  font-size: var(--size-13);
  font-weight: var(--weight-medium);
  color: var(--color-ok);
  background-color: var(--color-ok-wash);
  padding: var(--space-8) var(--space-16);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-32);
}

.bt-status-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-12);
  justify-content: center;
}

/* ---------- End of Edition Section ---------- */
.bt-end-section {
  background-color: var(--color-surface);
  border-radius: var(--tile-radius);
  padding: var(--space-48) var(--space-32);
  text-align: center;
  margin: var(--space-32) 0 var(--space-96) 0;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.bt-end-check {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background-color: var(--color-ok-wash);
  color: var(--color-ok);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-16);
}
.bt-end-check .i {
  width: 24px;
  height: 24px;
}

.bt-end-title {
  font-size: var(--text-feature);
  font-weight: var(--weight-bold);
  color: var(--color-ink);
  margin-bottom: var(--space-8);
}

.bt-end-text {
  font-size: var(--size-16);
  line-height: var(--leading-body);
  color: var(--color-ink-2);
  max-width: 52ch;
  margin-bottom: var(--space-32);
}

.bt-archive-heading {
  font-size: var(--size-13);
  font-weight: var(--weight-bold);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-ink-3);
  margin-bottom: var(--space-12);
}

.bt-archive-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-8);
  max-width: 640px;
}

.bt-archive-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-6);
  padding: var(--space-8) var(--space-16);
  background-color: var(--color-fill);
  color: var(--color-ink);
  font-size: var(--size-14);
  font-weight: var(--weight-medium);
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: background-color var(--motion-feedback) var(--ease-press),
              color var(--motion-feedback) var(--ease-press);
}
.bt-archive-btn:hover {
  background-color: var(--color-hair);
}
.bt-archive-btn.is-active {
  background-color: var(--color-accent);
  color: var(--color-on-accent);
}
.bt-archive-btn:focus-visible {
  outline: var(--focus-ring);
  outline-offset: var(--focus-offset);
}

.bt-back-to-top {
  margin-top: var(--space-32);
  font-size: var(--size-14);
  font-weight: var(--weight-medium);
  color: var(--color-accent);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.bt-back-to-top:hover {
  text-decoration: underline;
}
.bt-back-to-top:focus-visible {
  outline: var(--focus-ring);
  outline-offset: var(--focus-offset);
  border-radius: var(--radius-8);
}

/* ---------- Skeleton Loading State ---------- */
.bt-skeleton {
  background-color: var(--color-fill);
  border-radius: var(--radius-8);
  position: relative;
  overflow: hidden;
}
.bt-skeleton::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, oklch(var(--gray-99) / 0.15), transparent);
  animation: bt-shimmer 1.6s infinite;
}
@keyframes bt-shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

.sk-line { height: 16px; margin-bottom: 8px; border-radius: 4px; }
.sk-title { height: 28px; margin-bottom: 12px; border-radius: 6px; }
.sk-num { height: 48px; width: 100px; margin-bottom: 16px; border-radius: 8px; }
.sk-box { height: 80px; width: 100%; margin-bottom: 16px; border-radius: 12px; }

/* ---------- Responsive Adjustments ---------- */
@media (max-width: 767px) {
  .bt-bar {
    height: 56px;
    padding: 0 var(--space-16);
  }
  .bt-main {
    padding: 0 var(--space-16);
  }
  .bt-masthead {
    padding: var(--space-32) 0 var(--space-24) 0;
  }
  .bt-tile {
    padding: var(--space-24);
  }
  .bt-tile-lead {
    padding: var(--space-24);
  }
  .bt-end-section {
    padding: var(--space-32) var(--space-20);
    margin-bottom: var(--space-64);
  }
  .bt-numbers-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-12);
  }
}

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}