:root {
  --dh-font-sans: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --dh-font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  --dh-ink: #171717;
  --dh-muted: #62615d;
  --dh-subtle: #8a8882;
  --dh-line: rgba(31, 29, 25, 0.1);
  --dh-paper: #f7f5f0;
  --dh-surface: #fffdfa;
  --dh-surface-2: #f0eee8;
  --dh-accent: #d74718;
  --dh-accent-dark: #a93414;
  --dh-success: #16815a;
  --dh-warning: #aa650f;
  --dh-danger: #b92b21;
  --dh-ring: rgba(215, 71, 24, 0.24);
  --dh-shadow: 0 18px 48px rgba(54, 45, 32, 0.08), 0 1px 0 rgba(255, 255, 255, 0.72) inset;
  --dh-radius-sm: 8px;
  --dh-radius-md: 12px;
  --dh-radius-lg: 18px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--dh-font-sans);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  font-variant-numeric: tabular-nums;
}

button,
.button,
a,
input,
select,
textarea,
[tabindex] {
  transition: background-color 180ms ease, border-color 180ms ease, color 180ms ease, box-shadow 180ms ease, transform 180ms ease;
}

button:active,
.button:active,
.deal-card:active,
.queue-card:active {
  transform: translateY(1px);
}

button:focus-visible,
.button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
.deal-card:focus-visible {
  outline: 0;
  box-shadow: 0 0 0 4px var(--dh-ring);
}

/* Public feed */
body.product-feed {
  --bg-primary: #12110f;
  --bg-secondary: #1a1815;
  --bg-card: #211f1b;
  --bg-card-hover: #29251f;
  --border: rgba(255, 248, 235, 0.12);
  --text-primary: #f8f2e7;
  --text-secondary: #c7bfb1;
  --text-muted: #8e8578;
  --accent: #e15d25;
  --accent-light: #f08a45;
  --success: #54b987;
  --error: #ef6b5f;
  background:
    radial-gradient(circle at 15% 0%, rgba(225, 93, 37, 0.18), transparent 32rem),
    radial-gradient(circle at 92% 12%, rgba(84, 185, 135, 0.08), transparent 28rem),
    var(--bg-primary);
}

body.product-feed::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 300;
  pointer-events: none;
  opacity: 0.035;
  background-image:
    linear-gradient(0deg, rgba(255, 255, 255, 0.8) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.8) 1px, transparent 1px);
  background-size: 3px 3px;
  mix-blend-mode: screen;
}

.product-feed .header {
  background: color-mix(in srgb, var(--bg-primary) 88%, transparent);
  backdrop-filter: blur(18px);
}

.product-feed .header-top,
.product-feed .tabs-container {
  max-width: 1240px;
  margin: 0 auto;
}

.product-feed .logo {
  background: none;
  color: var(--text-primary);
  -webkit-text-fill-color: currentColor;
  letter-spacing: -0.03em;
}

.product-feed .logo::before {
  content: "";
  display: inline-block;
  width: 10px;
  height: 18px;
  margin-right: 10px;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--accent-light), var(--accent));
  transform: skew(-10deg);
  vertical-align: -2px;
}

.product-feed .user-avatar {
  border-radius: var(--dh-radius-md);
  border: 1px solid var(--border);
  background: rgba(255, 248, 235, 0.06);
  color: var(--text-primary);
}

.product-feed .tab,
.product-feed .sort-dropdown,
.product-feed .load-more {
  border-radius: var(--dh-radius-sm);
  background: rgba(255, 248, 235, 0.055);
}

.product-feed .tab.active {
  background: var(--accent);
  color: #fff9f2;
}

.product-feed .main {
  max-width: 1240px;
  padding-top: 28px;
}

.product-feed .feed-header {
  align-items: end;
  gap: 16px;
}

.product-feed .feed-title {
  font-size: clamp(1.8rem, 3vw, 3rem);
  letter-spacing: -0.05em;
  line-height: 0.98;
  text-wrap: balance;
}

.product-feed .feed-count {
  display: block;
  margin-top: 8px;
  font-size: 0.88rem;
  letter-spacing: 0;
}

.product-feed .deals-grid {
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 280px), 1fr));
  gap: 18px;
}

.product-feed .deal-card {
  border-radius: var(--dh-radius-lg);
  background: linear-gradient(180deg, rgba(255, 248, 235, 0.07), rgba(255, 248, 235, 0.04));
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.04) inset;
}

.product-feed .deal-card:hover {
  transform: translateY(-3px);
  border-color: rgba(225, 93, 37, 0.55);
  box-shadow: 0 22px 54px rgba(0, 0, 0, 0.26);
}

.product-feed .deal-image,
.product-feed .deal-image-placeholder {
  height: 190px;
}

.product-feed .deal-image-placeholder {
  color: var(--text-muted);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background:
    linear-gradient(135deg, rgba(255, 248, 235, 0.04), rgba(225, 93, 37, 0.12)),
    var(--bg-secondary);
}

.product-feed .deal-merchant {
  color: var(--accent-light);
  letter-spacing: 0.12em;
  font-size: 0.72rem;
  font-weight: 700;
}

.product-feed .deal-title {
  font-size: 1.02rem;
  letter-spacing: -0.015em;
}

.product-feed .deal-price {
  color: var(--success);
}

.product-feed .deal-score {
  border-radius: var(--dh-radius-sm);
  background: rgba(255, 248, 235, 0.1);
  color: var(--text-primary);
}

.product-feed .deal-score.medium,
.product-feed .deal-score.high,
.product-feed .deal-score.low {
  background: rgba(255, 248, 235, 0.1);
}

.product-feed .modal-overlay {
  background: rgba(10, 9, 8, 0.72);
  backdrop-filter: blur(8px);
}

.product-feed .modal {
  border: 1px solid var(--border);
  box-shadow: 0 -24px 70px rgba(0, 0, 0, 0.38);
}

.product-feed .category-item {
  border-radius: var(--dh-radius-md);
}

.feed-skeleton-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 280px), 1fr));
  gap: 18px;
}

.feed-skeleton-card {
  height: 300px;
  border: 1px solid var(--border);
  border-radius: var(--dh-radius-lg);
  background:
    linear-gradient(100deg, transparent 20%, rgba(255, 255, 255, 0.055) 38%, transparent 56%),
    rgba(255, 248, 235, 0.055);
  background-size: 240% 100%;
  animation: dh-shimmer 1.3s ease-in-out infinite;
}

.product-feed .empty-state {
  display: grid;
  justify-items: center;
  gap: 10px;
  margin-top: 36px;
  border: 1px solid var(--border);
  border-radius: var(--dh-radius-lg);
  background: rgba(255, 248, 235, 0.045);
}

.product-feed .empty-state-icon {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border-radius: var(--dh-radius-md);
  background: rgba(225, 93, 37, 0.14);
  color: var(--accent-light);
  font-size: 0;
}

.product-feed .empty-state-icon::before {
  content: "";
  width: 18px;
  height: 18px;
  border: 2px solid currentColor;
  border-radius: 50%;
  box-shadow: 12px 12px 0 -8px currentColor;
}

/* Internal operations surfaces */
body.ops-surface,
body.founder-surface,
body.validation-surface {
  background:
    radial-gradient(circle at 0 0, rgba(215, 71, 24, 0.08), transparent 34rem),
    var(--dh-paper);
  color: var(--dh-ink);
}

.ops-surface .shell,
.founder-surface main,
.validation-surface .container {
  max-width: 1220px;
}

.ops-surface .panel,
.ops-surface .queue-card,
.ops-surface .stat,
.ops-surface .modal,
.founder-surface .card,
.founder-surface .topbar,
.founder-surface .sidebar,
.validation-surface .header,
.validation-surface .stat-card,
.validation-surface .chart-container,
.validation-surface .deals-section {
  border: 1px solid var(--dh-line);
  border-radius: var(--dh-radius-md);
  background: color-mix(in srgb, var(--dh-surface) 96%, white);
  box-shadow: var(--dh-shadow);
}

.ops-surface h1,
.ops-surface h2,
.founder-surface h2,
.validation-surface h1,
.validation-surface h2 {
  letter-spacing: -0.035em;
  line-height: 1.05;
  text-wrap: balance;
}

.ops-surface .brand-title {
  font-size: clamp(22px, 2.4vw, 30px);
}

.ops-surface .tiny,
.ops-surface .muted,
.founder-surface .muted,
.validation-surface .stat-label {
  color: var(--dh-muted);
}

.ops-surface button,
.ops-surface .button,
.founder-surface button,
.validation-surface button,
.validation-surface .filter-btn {
  border-radius: var(--dh-radius-sm);
  min-height: 40px;
}

.ops-surface .primary,
.ops-surface button.primary,
.founder-surface button:not(.ghost),
.validation-surface .filter-btn.active {
  background: var(--dh-accent);
  border-color: var(--dh-accent);
  color: #fffaf4;
}

.ops-surface .primary:hover,
.ops-surface button.primary:hover,
.founder-surface button:not(.ghost):hover {
  background: var(--dh-accent-dark);
}

.ops-surface .ghost,
.ops-surface .button.ghost,
.founder-surface button.ghost,
.validation-surface .filter-btn {
  background: var(--dh-surface);
  border-color: var(--dh-line);
  color: var(--dh-ink);
}

.ops-surface .valid {
  background: var(--dh-success);
}

.ops-surface .warning {
  background: var(--dh-warning);
}

.ops-surface .danger {
  background: var(--dh-danger);
}

.ops-surface input,
.ops-surface textarea,
.ops-surface select,
.founder-surface input,
.validation-surface input,
.validation-surface select {
  border-color: var(--dh-line);
  background: #fffefa;
  color: var(--dh-ink);
}

.ops-surface .queue-grid {
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}

.ops-surface .queue-card {
  min-height: 168px;
}

.ops-surface .queue-count,
.ops-surface .price-main {
  color: var(--dh-accent);
  letter-spacing: -0.04em;
}

.ops-surface .review-bar {
  background: rgba(247, 245, 240, 0.9);
  backdrop-filter: blur(16px);
}

.ops-surface .deal-layout {
  grid-template-columns: minmax(0, 1fr) minmax(280px, 340px);
  gap: 18px;
}

.ops-surface .product-image,
.ops-surface .preview-thumb {
  border-radius: var(--dh-radius-sm);
  background: var(--dh-surface-2);
}

.ops-surface .badge {
  border-radius: var(--dh-radius-sm);
}

.ops-surface .empty,
.ops-surface .error-state {
  border-radius: var(--dh-radius-md);
}

.ops-surface .skeleton-card {
  background:
    linear-gradient(100deg, transparent 20%, rgba(255, 255, 255, 0.7) 38%, transparent 56%),
    #e8e4dc;
  background-size: 240% 100%;
  animation: dh-shimmer 1.3s ease-in-out infinite;
}

.founder-surface .sidebar {
  border-radius: 0;
  box-shadow: none;
}

.founder-surface .topbar {
  border-radius: 0;
  box-shadow: 0 1px 0 var(--dh-line);
}

.founder-surface .nav a {
  border-radius: var(--dh-radius-sm);
}

.founder-surface .nav a.active {
  background: var(--dh-accent);
}

.founder-surface .tile .value,
.validation-surface .stat-number {
  letter-spacing: -0.055em;
}

@keyframes dh-shimmer {
  0% { background-position: 120% 0; }
  100% { background-position: -120% 0; }
}

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

@media (max-width: 760px) {
  .product-feed .feed-header {
    display: grid;
    align-items: start;
  }

  .product-feed .sort-dropdown {
    width: 100%;
  }

  .product-feed .modal {
    max-height: 88dvh;
  }

  .ops-surface .deal-layout,
  .ops-surface .deal-top,
  .ops-surface .form-grid,
  .ops-surface .recommendation-mode .deal-top {
    grid-template-columns: 1fr;
  }
}