/* Sponsor Page Redesign - Modern dark-toned interface with fluid scale and depth */

:root {
  --surface-0: #05070C;
  --surface-1: #0A0D12;
  --surface-2: #0F131C;
  --surface-3: #161D2B;
  --surface-4: #1E2636;

  --accent-brass: #E9A568;
  --accent-brass-dim: #B8834F;
  --accent-emerald: #6EE7B7;
  --accent-cyan: #38BDF8;

  --text-1: #F4F6F8;
  --text-2: #C1C7D0;
  --text-3: #8B92A0;
  --text-4: #5A616E;

  --radius-tight: 8px;
  --radius-soft: 16px;
  --radius-pill: 999px;

  --shadow-soft: 0 4px 16px rgba(0, 0, 0, 0.3);
  --shadow-strong: 0 12px 40px rgba(0, 0, 0, 0.5);

  --font-display: Inter, system-ui, sans-serif;
  --font-mono: 'SF Mono', Consolas, monospace;
}

/* Smooth scroll behavior */
html {
  scroll-behavior: smooth;
}

/* Page foundation with layered surface */
.sponsor-page {
  background: linear-gradient(135deg, var(--surface-0) 0%, var(--surface-2) 100%);
  min-height: 100vh;
}

.sponsor-page::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(circle at 20% 30%, rgba(233, 165, 104, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(110, 231, 183, 0.06) 0%, transparent 50%);
  pointer-events: none;
}

/* Hero section with refined spacing */
.sponsor-page .feature-intro {
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: clamp(32px, 6vw, 80px);
  align-items: end;
  max-width: 1280px;
  margin: 0 auto;
  padding: clamp(80px, 12vw, 140px) clamp(20px, 5vw, 60px) clamp(48px, 8vw, 80px);
  border: 0;
}

/* Breadcrumb navigation */
.sponsor-breadcrumb {
  position: absolute;
  top: clamp(24px, 4vw, 40px);
  left: clamp(20px, 5vw, 60px);
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-4);
  font-size: 0.75rem;
}

.sponsor-breadcrumb a {
  color: var(--text-3);
  text-decoration: none;
  transition: color 0.2s ease;
}

.sponsor-breadcrumb a:hover {
  color: var(--accent-brass);
}

.sponsor-breadcrumb span {
  opacity: 0.5;
}

.sponsor-page .feature-intro::before {
  display: none;
}

.sponsor-page .feature-kicker {
  color: var(--accent-brass);
  font-family: var(--font-mono);
  font-size: clamp(0.65rem, 1.2vw, 0.72rem);
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.sponsor-page .feature-kicker::before {
  width: 24px;
  height: 2px;
  background: var(--accent-brass);
}

.sponsor-page .feature-title {
  margin-top: 12px;
  color: var(--text-1);
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 6vw, 5.2rem);
  font-weight: 780;
  line-height: 0.98;
  letter-spacing: -0.03em;
}

.sponsor-page .feature-title em {
  color: var(--accent-brass);
  background: linear-gradient(135deg, var(--accent-brass) 0%, var(--accent-emerald) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.sponsor-page .feature-desc {
  max-width: 62ch;
  margin-top: 20px;
  color: var(--text-3);
  font-size: clamp(0.9rem, 1.6vw, 1rem);
  line-height: 1.7;
}

.sponsor-page .feature-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-self: end;
  justify-content: flex-end;
}

.sponsor-page .feature-action {
  min-height: 44px;
  padding: 0 20px;
  border: 1px solid var(--surface-4);
  border-radius: var(--radius-pill);
  color: var(--text-2);
  background: var(--surface-3);
  font-family: var(--font-display);
  font-size: clamp(0.78rem, 1.4vw, 0.84rem);
  font-weight: 650;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all 0.22s cubic-bezier(0.4, 0, 0.2, 1);
}

.sponsor-page .feature-action:hover {
  border-color: var(--accent-cyan);
  color: var(--text-1);
  background: var(--surface-4);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(56, 189, 248, 0.15);
}

.sponsor-page .feature-action:active {
  transform: translateY(0);
}

.sponsor-page .feature-action.primary {
  border-color: var(--accent-brass);
  color: var(--surface-0);
  background: var(--accent-brass);
}

.sponsor-page .feature-action.primary:hover {
  background: linear-gradient(135deg, var(--accent-brass) 0%, #F5B978 100%);
  box-shadow: 0 8px 24px rgba(233, 165, 104, 0.3);
}

.sponsor-page .feature-action:focus-visible {
  outline: 2px solid var(--accent-cyan);
  outline-offset: 2px;
}

.sponsor-page .feature-action.primary:focus-visible {
  outline-color: var(--accent-brass);
}

/* Main layout - asymmetric two-column */
.sponsor-layout {
  display: grid;
  grid-template-columns: 1.45fr 1fr;
  gap: clamp(18px, 3vw, 28px);
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 clamp(20px, 5vw, 60px) clamp(60px, 10vw, 120px);
}

/* Checkout card - primary surface */
.sponsor-checkout {
  position: relative;
  padding: clamp(28px, 4vw, 48px);
  border: 1px solid rgba(233, 165, 104, 0.2);
  border-radius: var(--radius-soft);
  background: var(--surface-2);
  box-shadow: var(--shadow-strong), inset 0 1px 0 rgba(255, 255, 255, 0.04);
  overflow: hidden;
}

.sponsor-checkout::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-brass), transparent);
  opacity: 0.5;
}

.sponsor-checkout::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 100% 0%, rgba(233, 165, 104, 0.1) 0%, transparent 50%);
  pointer-events: none;
}

.sponsor-section-head {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
}

.sponsor-eyebrow {
  color: var(--accent-brass);
  font-family: var(--font-mono);
  font-size: 0.64rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.sponsor-section-head h2 {
  margin-top: 10px;
  color: var(--text-1);
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 2.4vw, 1.95rem);
  font-weight: 740;
  letter-spacing: -0.02em;
}

.sponsor-live {
  padding: 8px 12px;
  border: 1px solid rgba(110, 231, 183, 0.3);
  border-radius: var(--radius-pill);
  color: var(--accent-emerald);
  background: rgba(110, 231, 183, 0.08);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 650;
  white-space: nowrap;
}

.sponsor-live i {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 8px currentColor;
  animation: pulse-glow 2s ease-in-out infinite;
}

@keyframes pulse-glow {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* Tier selection grid */
.sponsor-tier-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 28px;
}

.sponsor-tier {
  position: relative;
  min-height: 130px;
  display: grid;
  align-content: start;
  gap: 10px;
  padding: 20px 18px;
  border: 1px solid var(--surface-4);
  border-radius: var(--radius-tight);
  color: var(--text-3);
  background: var(--surface-1);
  text-align: left;
  cursor: pointer;
  transition: all 0.24s cubic-bezier(0.4, 0, 0.2, 1);
  overflow: hidden;
}

.sponsor-tier::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: transparent;
  transition: background 0.24s ease;
}

.sponsor-tier.is-selected::before {
  background: linear-gradient(90deg, transparent, var(--accent-brass), transparent);
}

.sponsor-tier strong {
  color: var(--text-1);
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 2vw, 1.6rem);
  font-weight: 780;
  letter-spacing: -0.01em;
  transition: color 0.24s ease;
}

.sponsor-tier span {
  color: var(--accent-brass);
  font-family: var(--font-display);
  font-size: clamp(0.8rem, 1.4vw, 0.88rem);
  font-weight: 700;
  transition: color 0.24s ease;
}

.sponsor-tier small {
  color: var(--text-4);
  font-size: 0.7rem;
  line-height: 1.5;
  transition: color 0.24s ease;
}

.sponsor-tier:hover {
  border-color: var(--accent-brass-dim);
  transform: translateY(-4px) scale(1.02);
  box-shadow: 0 12px 32px rgba(233, 165, 104, 0.18);
}

.sponsor-tier:hover small {
  color: var(--text-3);
}

.sponsor-tier.is-selected {
  border-color: var(--accent-brass);
  background: linear-gradient(135deg, var(--surface-2) 0%, rgba(233, 165, 104, 0.12) 100%);
  box-shadow: 0 0 0 1px var(--accent-brass) inset, 0 8px 24px rgba(233, 165, 104, 0.25);
}

.sponsor-tier.is-selected strong {
  color: var(--accent-brass);
}

/* Accessibility: Focus states */
.sponsor-tier:focus-visible {
  outline: 2px solid var(--accent-brass);
  outline-offset: 2px;
}

/* Custom amount field */
.sponsor-custom-row {
  position: relative;
  z-index: 1;
  margin-top: 24px;
}

.sponsor-custom-row > label {
  display: block;
  margin-bottom: 10px;
  color: var(--text-3);
  font-family: var(--font-display);
  font-size: 0.74rem;
  font-weight: 650;
}

.sponsor-custom-control {
  display: flex;
  align-items: stretch;
  min-height: 50px;
  border: 1px solid var(--surface-4);
  border-radius: var(--radius-tight);
  background: var(--surface-1);
  overflow: hidden;
  transition: all 0.2s ease;
}

.sponsor-custom-control:focus-within {
  border-color: var(--accent-brass);
  box-shadow: 0 0 0 3px rgba(233, 165, 104, 0.15);
}

.sponsor-custom-control > span {
  display: grid;
  place-items: center;
  padding: 0 16px;
  color: var(--accent-brass);
  font-family: var(--font-mono);
  font-size: 0.92rem;
  font-weight: 700;
}

.sponsor-custom-control input {
  flex: 1;
  min-width: 0;
  padding: 0 14px;
  border: 0;
  outline: 0;
  color: var(--text-1);
  background: transparent;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 600;
}

.sponsor-custom-control input::placeholder {
  color: var(--text-4);
  transition: color 0.2s ease;
}

.sponsor-custom-control input:focus::placeholder {
  color: var(--text-3);
}

/* Input validation feedback */
.sponsor-custom-control input:invalid:not(:placeholder-shown) {
  color: #FF8A95;
}

.sponsor-custom-control:has(input:invalid:not(:placeholder-shown)) {
  border-color: rgba(255, 138, 149, 0.5);
}

.sponsor-custom-control button {
  padding: 0 18px;
  border: 0;
  border-left: 1px solid var(--surface-4);
  color: var(--text-3);
  background: rgba(255, 255, 255, 0.02);
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 650;
  cursor: pointer;
  transition: all 0.2s ease;
}

.sponsor-custom-control button:hover {
  color: var(--accent-brass);
  background: rgba(233, 165, 104, 0.12);
}

.sponsor-custom-control button:active {
  transform: scale(0.95);
}

/* Selected amount display */
.sponsor-selected {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-top: 24px;
  padding: 16px 18px;
  border-left: 3px solid var(--accent-brass);
  border-radius: 0 var(--radius-tight) var(--radius-tight) 0;
  background: rgba(233, 165, 104, 0.08);
  animation: slide-in 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes slide-in {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.sponsor-selected span {
  color: var(--text-4);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.sponsor-selected strong {
  color: var(--accent-brass);
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 780;
}

.sponsor-selected em {
  color: var(--text-2);
  font-size: 0.78rem;
  font-style: normal;
}

/* Anonymous checkbox */
.sponsor-anonymous-option {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 16px 0 8px;
  color: var(--text-3);
  font-size: 0.74rem;
  cursor: pointer;
  transition: color 0.2s ease;
  user-select: none;
}

.sponsor-anonymous-option:hover {
  color: var(--text-2);
}

.sponsor-anonymous-option input {
  width: 18px;
  height: 18px;
  accent-color: var(--accent-emerald);
  cursor: pointer;
}

.sponsor-anonymous-option:focus-within {
  outline: 2px solid var(--accent-emerald);
  outline-offset: 2px;
  border-radius: 4px;
}

/* Primary action button */
.sponsor-button {
  position: relative;
  z-index: 1;
  width: 100%;
  min-height: 52px;
  margin-top: 20px;
  border: 0;
  border-radius: var(--radius-pill);
  color: var(--surface-0);
  background: linear-gradient(135deg, var(--accent-brass) 0%, #F5B978 100%);
  font-family: var(--font-display);
  font-size: clamp(0.84rem, 1.5vw, 0.92rem);
  font-weight: 800;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 4px 16px rgba(233, 165, 104, 0.3);
}

.sponsor-button::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(135deg, #F5B978 0%, #FFCB8E 100%);
  opacity: 0;
  transition: opacity 0.28s ease;
}

.sponsor-button > span {
  position: relative;
  z-index: 1;
}

.sponsor-button:hover::before {
  opacity: 1;
}

.sponsor-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(233, 165, 104, 0.4);
}

.sponsor-button:active {
  transform: translateY(0);
}

.sponsor-button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.sponsor-button:disabled::before {
  opacity: 0;
}

/* Loading state */
.sponsor-button.is-loading {
  pointer-events: none;
}

.sponsor-button.is-loading::after {
  content: "";
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 16px;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: spinner 0.6s linear infinite;
}

@keyframes spinner {
  to { transform: translateY(-50%) rotate(360deg); }
}

/* Focus state for accessibility */
.sponsor-button:focus-visible {
  outline: 2px solid var(--accent-brass);
  outline-offset: 3px;
}

/* State message */
.sponsor-state {
  position: relative;
  z-index: 1;
  min-height: 1.4em;
  margin-top: 14px;
  padding-left: 24px;
  color: var(--text-3);
  font-size: 0.74rem;
  line-height: 1.6;
  transition: all 0.3s ease;
}

.sponsor-state::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.3em;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--text-4);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.sponsor-state[data-tone="error"] {
  color: #FF8A95;
}

.sponsor-state[data-tone="error"]::before {
  opacity: 1;
  background: #FF8A95;
  animation: pulse-error 1.5s ease-in-out infinite;
}

.sponsor-state[data-tone="success"] {
  color: var(--accent-emerald);
}

.sponsor-state[data-tone="success"]::before {
  opacity: 1;
  background: var(--accent-emerald);
  animation: pulse-success 1.5s ease-in-out infinite;
}

.sponsor-state[data-tone="pending"] {
  color: var(--accent-cyan);
}

.sponsor-state[data-tone="pending"]::before {
  opacity: 1;
  background: var(--accent-cyan);
  animation: pulse-pending 1.2s ease-in-out infinite;
}

@keyframes pulse-error {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.9); }
}

@keyframes pulse-success {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(1.1); }
}

@keyframes pulse-pending {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.sponsor-state[hidden] {
  display: none;
}

/* Footer notes */
.sponsor-notes {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 10px;
  margin-top: 22px;
}

.sponsor-notes span {
  position: relative;
  padding-left: 16px;
  color: var(--text-4);
  font-size: 0.68rem;
  line-height: 1.6;
}

.sponsor-notes span::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent-emerald);
}

/* Leaderboard sidebar */
.sponsor-leaderboard {
  position: relative;
  padding: clamp(24px, 3.5vw, 36px);
  border: 1px solid rgba(56, 189, 248, 0.15);
  border-radius: var(--radius-soft);
  background: var(--surface-1);
  box-shadow: var(--shadow-soft);
}

.sponsor-leaderboard::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 0% 0%, rgba(56, 189, 248, 0.08) 0%, transparent 60%);
  border-radius: inherit;
  pointer-events: none;
}

.leaderboard-head {
  position: relative;
  z-index: 1;
}

.sponsor-refresh {
  width: 36px;
  height: 36px;
  border: 1px solid var(--surface-4);
  border-radius: 50%;
  color: var(--text-3);
  background: var(--surface-2);
  font-size: 1.1rem;
  cursor: pointer;
  transition: all 0.24s ease;
}

.sponsor-refresh:hover {
  color: var(--accent-cyan);
  background: var(--surface-3);
  transform: rotate(180deg);
}

.sponsor-refresh:active {
  transform: rotate(180deg) scale(0.9);
}

.sponsor-refresh:focus-visible {
  outline: 2px solid var(--accent-cyan);
  outline-offset: 2px;
}

/* Board tabs */
.board-tabs {
  position: relative;
  z-index: 1;
  display: inline-flex;
  gap: 6px;
  margin-top: 22px;
  padding: 4px;
  border-radius: var(--radius-pill);
  background: var(--surface-0);
}

.board-tab {
  min-height: 34px;
  padding: 0 18px;
  border: 0;
  border-radius: var(--radius-pill);
  color: var(--text-3);
  background: transparent;
  font-family: var(--font-display);
  font-size: 0.74rem;
  font-weight: 650;
  cursor: pointer;
  transition: all 0.22s ease;
}

.board-tab:hover {
  color: var(--text-2);
  background: rgba(255, 255, 255, 0.05);
}

.board-tab.is-active {
  color: var(--text-1);
  background: var(--surface-3);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.board-tab:focus-visible {
  outline: 2px solid var(--accent-cyan);
  outline-offset: 2px;
}

/* Board summary */
.board-summary {
  position: relative;
  z-index: 1;
  margin-top: 24px;
  padding: 18px 20px;
  border-radius: var(--radius-tight);
  background: var(--surface-2);
}

.board-summary strong {
  display: block;
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 3vw, 2rem);
  font-weight: 780;
  letter-spacing: -0.02em;
}

.board-summary span {
  display: block;
  margin-top: 6px;
  color: var(--text-4);
  font-size: 0.7rem;
}

/* Leaderboard list */
.leaderboard-list {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 8px;
  margin-top: 20px;
}

.leaderboard-empty {
  padding: 40px 20px;
  color: var(--text-4);
  font-size: 0.8rem;
  text-align: center;
}

.leaderboard-item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  border-radius: var(--radius-tight);
  background: var(--surface-2);
  transition: all 0.2s ease;
  animation: fade-in 0.4s ease backwards;
}

.leaderboard-item:nth-child(1) { animation-delay: 0.05s; }
.leaderboard-item:nth-child(2) { animation-delay: 0.1s; }
.leaderboard-item:nth-child(3) { animation-delay: 0.15s; }
.leaderboard-item:nth-child(4) { animation-delay: 0.2s; }
.leaderboard-item:nth-child(5) { animation-delay: 0.25s; }
.leaderboard-item:nth-child(6) { animation-delay: 0.3s; }
.leaderboard-item:nth-child(7) { animation-delay: 0.35s; }
.leaderboard-item:nth-child(8) { animation-delay: 0.4s; }
.leaderboard-item:nth-child(9) { animation-delay: 0.45s; }
.leaderboard-item:nth-child(10) { animation-delay: 0.5s; }

@keyframes fade-in {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.leaderboard-item:hover {
  background: var(--surface-3);
  transform: translateX(4px);
}

.leaderboard-rank {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: var(--text-4);
  background: var(--surface-0);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  transition: all 0.2s ease;
}

.leaderboard-item:nth-child(1) .leaderboard-rank {
  color: #FFD700;
  background: rgba(255, 215, 0, 0.15);
  box-shadow: 0 0 12px rgba(255, 215, 0, 0.3);
}

.leaderboard-item:nth-child(2) .leaderboard-rank {
  color: #C0C0C0;
  background: rgba(192, 192, 192, 0.15);
  box-shadow: 0 0 12px rgba(192, 192, 192, 0.3);
}

.leaderboard-item:nth-child(3) .leaderboard-rank {
  color: #CD7F32;
  background: rgba(205, 127, 50, 0.15);
  box-shadow: 0 0 12px rgba(205, 127, 50, 0.3);
}

.leaderboard-name {
  min-width: 0;
  color: var(--text-2);
  font-size: 0.82rem;
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.leaderboard-amount {
  color: var(--accent-brass);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
}

.leaderboard-footnote {
  position: relative;
  z-index: 1;
  margin-top: 18px;
  color: var(--text-4);
  font-size: 0.66rem;
  line-height: 1.5;
}

.leaderboard-footnote time {
  color: var(--accent-cyan);
}

/* Trust strip at bottom */
.sponsor-trust-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0;
  border: 1px solid var(--surface-4);
  border-radius: var(--radius-tight);
  background: var(--surface-4);
  overflow: hidden;
}

.sponsor-trust-strip article {
  display: grid;
  align-content: start;
  gap: 8px;
  padding: 24px 20px;
  background: var(--surface-2);
}

.sponsor-trust-strip b {
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  font-size: 0.64rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.sponsor-trust-strip strong {
  color: var(--text-1);
  font-size: 0.84rem;
  font-weight: 700;
}

.sponsor-trust-strip span {
  color: var(--text-4);
  font-size: 0.68rem;
  line-height: 1.55;
}

/* Responsive adjustments */
@media (max-width: 960px) {
  .sponsor-page .feature-intro {
    grid-template-columns: 1fr;
  }

  .sponsor-breadcrumb {
    position: static;
    margin-bottom: 20px;
  }

  .sponsor-page .feature-intro > div:first-of-type {
    order: 1;
  }

  .sponsor-page .feature-actions {
    order: 2;
    justify-content: flex-start;
  }

  .sponsor-layout {
    grid-template-columns: 1fr;
  }

  .sponsor-leaderboard {
    order: -1;
  }

  .sponsor-trust-strip {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .sponsor-page .feature-intro {
    padding: 60px 16px 40px;
  }

  .sponsor-breadcrumb {
    font-size: 0.7rem;
    gap: 6px;
  }

  .sponsor-layout {
    padding: 0 16px 80px;
  }

  .sponsor-tier-grid {
    grid-template-columns: 1fr;
  }

  .sponsor-trust-strip {
    grid-template-columns: 1fr;
  }
}

/* Modal overlay */
body.modal-open{overflow:hidden}
.payment-checkout-modal{position:fixed;inset:0;z-index:120;display:grid;place-items:center;padding:18px}
.payment-checkout-modal[hidden],.payment-qr-zoom[hidden]{display:none}
.payment-checkout-backdrop,.payment-qr-zoom-backdrop{position:absolute;inset:0;border:0;background:rgba(3,5,7,.86);backdrop-filter:blur(7px)}
.payment-checkout-card{position:relative;width:min(100%,900px);max-height:calc(100vh - 36px);overflow:auto;padding:clamp(20px,3vw,32px);border:1px solid var(--border-subtle,#2c3038);border-radius:6px;background:#14171b;box-shadow:0 28px 90px rgba(0,0,0,.58);color:var(--text-1,#eef0f3)}
.payment-checkout-close{position:absolute;top:12px;right:12px;z-index:2;width:34px;height:34px;border:0;color:var(--text-3,#9ba1ab);background:transparent;font-size:1.5rem;cursor:pointer}
.payment-checkout-head{display:flex;align-items:flex-end;justify-content:space-between;gap:18px;padding-right:38px}.payment-checkout-head span{color:#00b8d4;font:700 .64rem ui-monospace,monospace;letter-spacing:.12em}.payment-checkout-head h2{margin-top:7px;color:#eef0f3;font-size:1.35rem}.payment-checkout-head>strong{color:#ffc107;font:700 1.8rem ui-monospace,monospace}
.payment-order-meta{display:flex;justify-content:space-between;gap:14px;margin-top:15px;padding:11px 0;border-top:1px solid #2c3038;color:#737a85;font-size:.68rem}.payment-order-meta code{color:#9ba1ab}
.payment-method-list{display:grid;gap:9px;margin-top:16px}.payment-method-option{display:grid;grid-template-columns:12px minmax(0,1fr) auto;align-items:center;gap:13px;min-height:68px;padding:12px 14px;border:1px solid #2c3038;border-radius:4px;color:#eef0f3;background:#0f1216;text-align:left;cursor:pointer}.payment-method-option>i{width:10px;height:10px;border:2px solid #59606b;border-radius:50%;box-shadow:inset 0 0 0 2px #0f1216}.payment-method-option strong,.payment-method-option span{display:block}.payment-method-option strong{font-size:.8rem}.payment-method-option span{margin-top:4px;color:#737a85;font-size:.66rem}.payment-method-option>b{color:#737a85;font-size:.68rem}.payment-method-option.is-selected{border-color:#ffc107;background:rgba(255,193,7,.055)}.payment-method-option.is-selected>i{border-color:#ffc107;background:#ffc107}.payment-method-option.is-selected>b{color:#ffc107}
.payment-method-confirm,.payment-check-actions{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:18px}.payment-method-confirm .sponsor-button,.payment-check-actions .sponsor-button{margin:0}.payment-method-confirm .feature-action,.payment-check-actions .feature-action{justify-content:center}
.payment-single-qr{display:grid;grid-template-columns:minmax(230px,320px) minmax(0,1fr);gap:26px;align-items:center;max-width:680px;margin:20px auto 0}.payment-single-qr-image{padding:10px;border:1px solid #2c3038;border-radius:4px;color:#737a85;background:#fff;cursor:zoom-in}.payment-single-qr-image img{display:block;width:100%;aspect-ratio:1;object-fit:contain}.payment-single-qr-image span{display:block;padding:8px 4px 0;color:#59606b;font-size:.65rem;text-align:center}.payment-single-qr-info>span{color:#00b8d4;font:700 .62rem ui-monospace,monospace}.payment-single-qr-info>strong{display:block;margin-top:8px;color:#eef0f3;font-size:1.2rem}.payment-single-qr-info>p{margin:10px 0 18px;color:#9ba1ab;font-size:.72rem;line-height:1.65}
.payment-qr-zoom{position:fixed;inset:0;z-index:124;display:grid;place-items:center;padding:20px}.payment-qr-zoom-card{position:relative;width:min(88vw,620px);max-height:92vh;padding:22px;border:1px solid #2c3038;border-radius:6px;background:#111419;text-align:center;box-shadow:0 30px 100px rgba(0,0,0,.72)}.payment-qr-zoom-card img{display:block;width:min(100%,540px);max-height:72vh;margin:0 auto;object-fit:contain;background:#fff}.payment-qr-zoom-card strong{display:block;margin-top:13px;color:#eef0f3;font-size:.84rem}.payment-qr-zoom-card>span{display:block;margin-top:5px;color:#737a85;font-size:.65rem}
@media (max-width:700px){.payment-check-actions,.payment-method-confirm{grid-template-columns:1fr}.payment-single-qr{grid-template-columns:1fr;gap:16px}.payment-single-qr-image{width:min(100%,330px);margin:0 auto}.payment-single-qr-info{text-align:center}}
.sponsor-modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  padding: 20px;
}

.sponsor-modal[hidden] {
  display: none;
}

.sponsor-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(5, 7, 12, 0.88);
  backdrop-filter: blur(12px);
}

.sponsor-modal-card {
  position: relative;
  width: min(100%, 520px);
  max-height: min(720px, calc(100vh - 40px));
  padding: 40px;
  border: 1px solid rgba(233, 165, 104, 0.3);
  border-radius: var(--radius-soft);
  background: var(--surface-2);
  box-shadow: 0 32px 96px rgba(0, 0, 0, 0.6);
  overflow-y: auto;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
}

.sponsor-modal-card .sponsor-eyebrow {
  display: block;
  margin-bottom: 4px;
}

.sponsor-modal-card h2 {
  margin-top: 8px;
  margin-bottom: 0;
  color: var(--text-1);
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 740;
}

.modal-warning {
  margin-top: 16px;
  padding: 14px 16px;
  border-left: 2px solid rgba(233, 165, 104, 0.5);
  border-radius: 4px;
  color: var(--text-3);
  background: rgba(233, 165, 104, 0.06);
  font-size: 0.8rem;
  line-height: 1.6;
}

.modal-summary {
  margin-top: 14px;
  padding: 16px 18px;
  border-radius: var(--radius-tight);
  color: var(--text-2);
  background: var(--surface-1);
  font-family: var(--font-mono);
  font-size: 0.88rem;
}

.modal-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.modal-actions .feature-action,
.modal-actions .sponsor-button {
  flex: 1;
  min-width: 140px;
  margin: 0;
}

.modal-confirm {
  flex: 1.5;
}

.sponsor-modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  z-index: 10;
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border: 0;
  border-radius: 50%;
  color: var(--text-3);
  background: var(--surface-1);
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  transition: all 0.2s ease;
}

.sponsor-modal-close:hover {
  color: var(--text-1);
  background: var(--surface-3);
  transform: scale(1.1);
}

.sponsor-modal-close:active {
  transform: scale(0.95);
}

/* Smooth transitions */
@media (prefers-reduced-motion: no-preference) {
  .sponsor-tier,
  .sponsor-button,
  .leaderboard-item {
    will-change: transform;
  }

  .leaderboard-list {
    transition: opacity 0.3s ease;
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  .sponsor-tier {
    border-width: 2px;
  }

  .sponsor-tier.is-selected {
    border-width: 3px;
  }

  .sponsor-button {
    border: 2px solid var(--accent-brass);
  }
}

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

  .sponsor-selected {
    animation: none;
  }

  .leaderboard-item {
    animation: none;
  }
}