:root {
  /* 设计令牌：浅色明快主题，单一蓝色强调色 */
  --bg: #f4f6fb;
  --surface: #ffffff;
  --surface-2: #eef1f8;
  --surface-3: #e2e7f2;
  --text: #1c2434;
  --text-muted: #5b6577;
  --border: #d9e0ec;
  --accent: #3563e9;
  --accent: oklch(55% 0.18 262);
  --accent-strong: #244ec7;
  --accent-strong: oklch(47% 0.17 262);
  --accent-soft: #e8eeff;
  --accent-soft: oklch(95% 0.03 262);
  --danger: #d64545;
  --danger: oklch(58% 0.2 25);
  --danger-soft: #fdecec;
  --success: #1f9d6a;
  --success-soft: #e4f6ee;
  --radius-sm: 0.5rem;
  --radius: 0.875rem;
  --radius-lg: 1.25rem;
  --shadow-sm: 0 1px 2px rgb(15 23 42 / 0.05);
  --shadow: 0 1px 2px rgb(15 23 42 / 0.04), 0 10px 30px rgb(15 23 42 / 0.07);
  --focus-ring: 0 0 0 3px oklch(75% 0.12 262 / 0.55);
  --font: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
}

* {
  box-sizing: border-box;
}

html {
  color-scheme: light;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.55;
  min-height: 100vh;
}

/* 可自定义背景图：固定铺满，上叠半透明遮罩保证文字可读 */
#bg-layer {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(circle at 15% 15%, oklch(93% 0.03 262 / 0.75), transparent 42%),
    radial-gradient(circle at 85% 85%, oklch(95% 0.025 200 / 0.7), transparent 46%),
    var(--bg);
  background-position: center;
  background-size: cover;
}

#bg-layer::after {
  content: "";
  position: absolute;
  inset: 0;
  background: oklch(96% 0.01 262 / 0.86);
}

/* 通用可访问性工具 */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  inset-inline-start: 0.75rem;
  transform: translateY(-150%);
  z-index: 200;
  background: var(--accent);
  color: #fff;
  padding: 0.625rem 1rem;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  text-decoration: none;
  font-weight: 600;
}

.skip-link:focus {
  transform: translateY(0);
}

:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

/* 页头 */
.app-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: oklch(100% 0 0 / 0.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: 80rem;
  margin-inline: auto;
  padding-inline: 1rem;
  min-height: 4rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.brand {
  font-weight: 800;
  font-size: 1rem;
  letter-spacing: 0.02em;
  color: var(--accent);
  white-space: nowrap;
}

.header-title {
  font-weight: 700;
  font-size: 1.05rem;
  min-inline-size: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1 1 auto;
}

.main-nav {
  display: flex;
  gap: 0.25rem;
  background: var(--surface-2);
  padding: 0.25rem;
  border-radius: 999px;
}

.main-nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.375rem 0.875rem;
  border-radius: 999px;
  transition: background 160ms var(--ease), color 160ms var(--ease);
}

.main-nav a:hover {
  color: var(--text);
}

.main-nav a[aria-current="page"] {
  background: var(--surface);
  color: var(--accent);
  box-shadow: var(--shadow-sm);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.header-select {
  font: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.4rem 2rem 0.4rem 0.9rem;
  min-block-size: 2.5rem;
  max-inline-size: 13rem;
  cursor: pointer;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.375rem;
  border: 1px solid transparent;
  border-radius: 999px;
  font: inherit;
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0.45rem 0.9rem;
  cursor: pointer;
  min-block-size: 2.5rem;
  transition: background 160ms var(--ease), border-color 160ms var(--ease), color 160ms var(--ease), transform 120ms var(--ease);
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent-strong);
}

.btn-secondary {
  background: var(--surface);
  border-color: var(--border);
  color: var(--text);
}

.btn-secondary:hover {
  background: var(--surface-2);
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border-color: transparent;
}

.btn-ghost:hover {
  background: var(--surface-2);
  color: var(--text);
}

.btn-danger {
  background: var(--danger-soft);
  color: var(--danger);
}

.btn-danger:hover {
  background: oklch(from var(--danger) l c h / 0.14);
}

.btn-sm {
  min-block-size: 2rem;
  padding: 0.25rem 0.625rem;
  font-size: 0.82rem;
}

/* 页面布局 */
.page-wrap {
  max-width: 80rem;
  margin-inline: auto;
  padding: 1.25rem 1rem 3rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  align-items: start;
}

@media (width >= 64rem) {
  .page-wrap {
    grid-template-columns: 19rem 1fr;
  }

  .page-wrap.no-sidebar {
    grid-template-columns: 1fr;
  }

  .page-wrap.sidebar-hidden {
    grid-template-columns: 1fr;
  }
}

main {
  min-inline-size: 0;
}

main > h1 {
  margin: 0.25rem 0 0.5rem;
  font-size: clamp(1.5rem, 2.4vw, 2rem);
  letter-spacing: -0.01em;
}

.page-intro {
  margin: 0 0 1.25rem;
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* 侧边栏（赛制规则） */
.rules-sidebar {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

@media (width >= 64rem) {
  .rules-sidebar {
    position: sticky;
    top: 5.5rem;
  }
}

.rules-sidebar-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 1rem 1.1rem 0.75rem;
  border-bottom: 1px solid var(--border);
}

.rules-sidebar-head h2 {
  margin: 0;
  font-size: 1rem;
}

.rules-body {
  padding: 1rem 1.1rem 1.25rem;
}

.rules-text {
  margin: 0 0 1rem;
  white-space: pre-wrap;
  color: var(--text);
  font-size: 0.95rem;
}

.rules-toggle {
  flex-shrink: 0;
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin-block-end: 1.25rem;
}

.toolbar .spacer {
  flex: 1 1 auto;
}

/* 冠军横幅 */
.champion-banner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  background: linear-gradient(120deg, var(--accent-soft), oklch(97% 0.02 262 / 0.7));
  border: 1px solid oklch(from var(--accent) l c h / 0.35);
  border-radius: var(--radius);
  padding: 0.875rem 1.25rem;
  margin-block-end: 1.25rem;
  box-shadow: var(--shadow-sm);
}

.champion-banner[hidden] {
  display: none;
}

.champion-banner strong {
  font-size: 1.1rem;
}

.champion-banner .medal {
  font-size: 1.5rem;
}

/* 选手名单 */
.roster-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(12rem, 1fr));
  gap: 0.75rem;
  margin-block-end: 1.5rem;
}

.roster-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.55rem 0.75rem;
  box-shadow: var(--shadow-sm);
}

.roster-index {
  flex-shrink: 0;
  inline-size: 1.75rem;
  block-size: 1.75rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 700;
  font-size: 0.85rem;
}

.roster-item input,
.player-name-input,
.deck-name-input {
  font: inherit;
  color: var(--text);
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  padding: 0.35rem 0.5rem;
  min-inline-size: 0;
  inline-size: 100%;
}

.roster-item input:hover,
.player-name-input:hover,
.deck-name-input:hover {
  border-color: var(--border);
}

.roster-item input:focus,
.player-name-input:focus,
.deck-name-input:focus {
  border-color: var(--accent);
  background: var(--surface);
}

/* 赛程区块 */
.bracket-section + .bracket-section {
  margin-block-start: 2rem;
}

.section-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0 0 0.75rem;
  font-size: 1.2rem;
}

.section-title .phase-tag {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 999px;
  padding: 0.2rem 0.6rem;
}

.bracket-flow {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
  align-items: start;
}

@media (width >= 48rem) {
  .bracket-flow {
    grid-template-columns: repeat(var(--rounds, 3), minmax(0, 1fr));
    gap: 1.5rem;
  }
}

.bracket-col {
  display: grid;
  gap: 0.75rem;
  align-content: start;
  min-inline-size: 0;
}

.round-label {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

/* 对局卡片 */
.match-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 0.75rem;
  transition: border-color 160ms var(--ease), box-shadow 160ms var(--ease);
}

.match-card.played {
  border-color: oklch(from var(--accent) l c h / 0.4);
  box-shadow: var(--shadow);
}

.match-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem;
  margin-block-end: 0.5rem;
}

.match-title {
  margin: 0;
  font-size: 0.88rem;
  font-weight: 700;
}

.match-state {
  flex-shrink: 0;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--surface-2);
  border-radius: 999px;
  padding: 0.15rem 0.5rem;
}

.match-state.done {
  color: var(--success);
  background: var(--success-soft);
}

.match-player {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  border-radius: var(--radius-sm);
  padding: 0.45rem 0.55rem;
  border: 1px solid transparent;
  background: var(--surface-2);
}

.match-player + .match-player {
  margin-block-start: 0.375rem;
}

.match-player.tbd {
  color: var(--text-muted);
  font-style: italic;
}

.match-player.winner {
  background: var(--accent-soft);
  border-color: oklch(from var(--accent) l c h / 0.4);
  font-weight: 700;
}

.match-player.loser {
  opacity: 0.62;
}

.player-name {
  flex: 1 1 auto;
  min-inline-size: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.player-score {
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  min-inline-size: 1.5rem;
  text-align: center;
}

.score-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
  margin-block-start: 0.625rem;
}

.score-btn {
  font: inherit;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-muted);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.25rem 0.55rem;
  cursor: pointer;
  transition: background 140ms var(--ease), color 140ms var(--ease), border-color 140ms var(--ease);
}

.score-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.score-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.score-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.score-clear {
  color: var(--danger);
  border-color: transparent;
  background: transparent;
}

.score-clear:hover {
  background: var(--danger-soft);
  border-color: transparent;
  color: var(--danger);
}

/* 卡组页 */
.players-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

@media (width >= 48rem) {
  .players-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (width >= 64rem) {
  .players-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.player-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: 1rem;
  display: grid;
  gap: 1rem;
  align-content: start;
}

.player-card-head {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.player-card-head .roster-index {
  flex-shrink: 0;
}

.deck {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: oklch(99% 0 0);
  padding: 0.75rem;
  display: grid;
  gap: 0.625rem;
}

.deck-name-input {
  font-weight: 700;
}

.deck-images {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.625rem;
}

.image-slot-wrap {
  position: relative;
  min-inline-size: 0;
}

.image-slot {
  position: relative;
  inline-size: 100%;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background-color: var(--surface-2);
  background-position: center;
  background-repeat: no-repeat;
  background-size: contain;
  border: 1px solid var(--border);
  padding: 0;
}

button.image-slot {
  cursor: pointer;
}

.image-slot.empty {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.375rem;
  flex-direction: column;
  color: var(--text-muted);
  font: inherit;
  font-size: 0.82rem;
  font-weight: 600;
  background:
    repeating-linear-gradient(-45deg, var(--surface-2), var(--surface-2) 8px, oklch(96% 0.01 262) 8px, oklch(96% 0.01 262) 16px);
  transition: border-color 160ms var(--ease), color 160ms var(--ease);
}

.image-slot.empty:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.image-slot.empty.drag-over {
  border-color: var(--accent);
  color: var(--accent);
  background:
    repeating-linear-gradient(-45deg, var(--accent-soft), var(--accent-soft) 8px, oklch(93% 0.04 262) 8px, oklch(93% 0.04 262) 16px);
  box-shadow: 0 0 0 3px oklch(from var(--accent) l c h / 0.3);
  transform: scale(1.02);
}

.image-slot .slot-plus {
  font-size: 1.4rem;
  line-height: 1;
}

.image-slot .slot-actions {
  position: absolute;
  inset-block-end: 0.375rem;
  inset-inline-end: 0.375rem;
  display: flex;
  gap: 0.25rem;
  opacity: 0;
  transform: translateY(3px);
  transition: opacity 160ms var(--ease), transform 160ms var(--ease);
}

.image-slot-wrap:hover .slot-actions,
.image-slot-wrap:focus-within .slot-actions {
  opacity: 1;
  transform: translateY(0);
}

.slot-action {
  font: inherit;
  font-size: 0.72rem;
  font-weight: 600;
  color: #fff;
  background: oklch(22% 0.02 262 / 0.82);
  border: 0;
  border-radius: 999px;
  padding: 0.2rem 0.5rem;
  cursor: pointer;
  backdrop-filter: blur(4px);
}

.slot-action:hover {
  background: oklch(22% 0.02 262 / 0.95);
}

.slot-action.danger {
  background: oklch(from var(--danger) l c h / 0.85);
}

.slot-action.danger:hover {
  background: var(--danger);
}

/* 弹窗 */
dialog {
  border: 0;
  border-radius: var(--radius-lg);
  box-shadow: 0 24px 80px rgb(15 23 42 / 0.25);
  padding: 0;
  inline-size: min(92vw, 34rem);
  max-block-size: min(85vh, 46rem);
  overflow: auto;
}

dialog::backdrop {
  background: oklch(18% 0.02 262 / 0.45);
}

.dialog-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.1rem 1.25rem 0.75rem;
}

.dialog-head h2 {
  margin: 0;
  font-size: 1.15rem;
}

.dialog-body {
  padding: 0.75rem 1.25rem 1.25rem;
  display: grid;
  gap: 1rem;
}

.form-field {
  display: grid;
  gap: 0.375rem;
}

.form-field label {
  font-weight: 600;
  font-size: 0.9rem;
}

.form-field input[type="text"],
.form-field input[type="password"],
.form-field textarea {
  font: inherit;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.55rem 0.75rem;
  inline-size: 100%;
}

.form-field textarea {
  min-block-size: 9rem;
  resize: vertical;
}

.bg-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
}

.bg-preview {
  inline-size: 9rem;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background-color: var(--surface-2);
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
}

.manage-list {
  display: grid;
  gap: 0.5rem;
}

.manage-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.75rem;
}

.manage-item.is-active {
  border-color: oklch(from var(--accent) l c h / 0.55);
  background: var(--accent-soft);
}

.manage-item-name {
  flex: 1 1 auto;
  font: inherit;
  font-weight: 600;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  padding: 0.3rem 0.5rem;
  min-inline-size: 0;
}

.manage-item-name:hover {
  border-color: var(--border);
}

.manage-item-name:focus {
  border-color: var(--accent);
  background: var(--surface);
}

.active-badge {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent);
}

.dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
  flex-wrap: wrap;
}

#create-tournament-form input[type="text"] {
  flex: 1 1 auto;
  min-inline-size: 10rem;
  font: inherit;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.45rem 0.9rem;
}

.hint {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.8rem;
}

.admin-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.admin-controls input[type="password"] {
  flex: 1 1 auto;
  min-inline-size: 10rem;
}

/* 灯箱 */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: oklch(12% 0.02 262 / 0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2.5rem;
}

.lightbox[hidden] {
  display: none;
}

.lightbox-img {
  max-inline-size: min(94vw, 110rem);
  max-block-size: 88vh;
  border-radius: var(--radius-sm);
  box-shadow: 0 20px 80px rgb(0 0 0 / 0.5);
  object-fit: contain;
}

.lightbox-btn {
  position: absolute;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid oklch(100% 0 0 / 0.25);
  border-radius: 999px;
  background: oklch(100% 0 0 / 0.12);
  color: #fff;
  font: inherit;
  font-size: 1rem;
  font-weight: 700;
  block-size: 2.75rem;
  inline-size: 2.75rem;
  cursor: pointer;
  transition: background 160ms var(--ease);
}

.lightbox-btn:hover {
  background: oklch(100% 0 0 / 0.24);
}

.lightbox-close {
  inset-block-start: 1rem;
  inset-inline-end: 1rem;
}

.lightbox-prev {
  inset-block-start: 50%;
  inset-inline-start: 1rem;
  transform: translateY(-50%);
}

.lightbox-next {
  inset-block-start: 50%;
  inset-inline-end: 1rem;
  transform: translateY(-50%);
}

/* 动效与无障碍偏好 */
.match-card,
.player-card,
.rules-sidebar,
.champion-banner {
  animation: rise 360ms var(--ease) both;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@media (prefers-contrast: more) {
  :root {
    --border: #33415c;
    --text-muted: #3a4355;
  }
}

@media (width < 30rem) {
  .deck-images {
    grid-template-columns: 1fr;
  }
}