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

/* ── Variables ──────────────────────────────── */
:root {
  --bg:        #080812;
  --surface:   #111127;
  --card:      #16162e;
  --border:    rgba(255,255,255,0.08);
  --border2:   rgba(255,255,255,0.14);
  --p1:        #9d5cff;
  --p2:        #e040a0;
  --p3:        #38bdf8;
  --text:      #eef0ff;
  --text2:     #8890b0;
  --text3:     #4a5070;
  --r:         18px;
  --r2:        12px;
}

/* ── Body ───────────────────────────────────── */
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  background-image:
    radial-gradient(ellipse 70% 40% at 15% 0%, rgba(157,92,255,.18) 0%, transparent 55%),
    radial-gradient(ellipse 50% 35% at 85% 100%, rgba(56,189,248,.12) 0%, transparent 55%);
}

/* ── Navbar ─────────────────────────────────── */
.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  height: 60px;
  border-bottom: 1px solid var(--border);
  background: rgba(8,8,18,.85);
  backdrop-filter: blur(16px);
  position: sticky;
  top: 0;
  z-index: 50;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 9px;
}

.brand-icon {
  font-size: 24px;
  filter: drop-shadow(0 0 10px rgba(157,92,255,.7));
}

.brand-name {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -.3px;
  background: linear-gradient(110deg, #b57aff 0%, #ff5fad 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.user-btn {
  display: flex;
  align-items: center;
  gap: 7px;
  background: var(--card);
  border: 1px solid var(--border2);
  border-radius: 999px;
  padding: 7px 14px;
  color: var(--text2);
  font-size: 13px;
  cursor: pointer;
  transition: all .18s;
}
.user-btn:hover { background: #1e1e40; color: var(--text); }
.user-avatar { font-size: 15px; }

/* ── Screen ─────────────────────────────────── */
.app { min-height: 100vh; }

.screen { display: none; max-width: 680px; margin: 0 auto; padding: 28px 18px 72px; }
.screen.active { display: block; }

/* ── Hero ───────────────────────────────────── */
.hero {
  text-align: center;
  padding: 36px 0 28px;
}

.hero-badge {
  display: inline-block;
  background: rgba(157,92,255,.15);
  border: 1px solid rgba(157,92,255,.35);
  border-radius: 999px;
  padding: 4px 14px;
  font-size: 12px;
  font-weight: 600;
  color: #c4a0ff;
  letter-spacing: .5px;
  margin-bottom: 16px;
}

.hero-title {
  font-size: 44px;
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -1.5px;
  margin-bottom: 10px;
}

.gradient-text {
  background: linear-gradient(130deg, #b57aff 0%, #ff5fad 45%, #38bdf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-sub {
  color: var(--text3);
  font-size: 14px;
  letter-spacing: .3px;
}

/* ── Upload card ────────────────────────────── */
.upload-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--r);
  overflow: hidden;
  margin-bottom: 14px;
}

.drop-zone {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 22px 24px;
  cursor: pointer;
  border-bottom: 1px solid transparent;
  transition: all .18s;
}

.drop-zone:hover,
.drop-zone.dragover {
  background: rgba(157,92,255,.07);
  border-bottom-color: rgba(157,92,255,.2);
}

.drop-icon { font-size: 36px; flex-shrink: 0; filter: drop-shadow(0 0 8px rgba(157,92,255,.5)); }

.drop-texts { display: flex; flex-direction: column; gap: 3px; }
.drop-text { font-size: 15px; font-weight: 600; color: var(--text); }
.drop-hint { font-size: 12px; color: var(--text3); }

/* ── Image pool ─────────────────────────────── */
.image-pool {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 14px 16px;
}

.image-pool:empty { display: none; }

.pool-thumb {
  position: relative;
  width: 80px;
  height: 80px;
  border-radius: 10px;
  overflow: hidden;
  background-size: cover;
  background-position: center;
  border: 2px solid transparent;
  transition: border-color .18s, transform .15s;
  flex-shrink: 0;
}
.pool-thumb:hover { border-color: var(--p1); transform: scale(1.05); }

.pool-thumb .remove-btn {
  position: absolute;
  top: 3px; right: 3px;
  width: 20px; height: 20px;
  border: none; border-radius: 50%;
  background: rgba(0,0,0,.75);
  color: white; font-size: 10px;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  opacity: 0; transition: opacity .15s;
}
.pool-thumb:hover .remove-btn { opacity: 1; }

.pool-thumb .share-toggle {
  position: absolute; bottom: 0; left: 0; right: 0;
  display: flex; align-items: center; gap: 3px;
  padding: 3px 5px;
  background: rgba(0,0,0,.7);
  color: rgba(255,255,255,.85);
  font-size: 9px; cursor: pointer;
}
.pool-thumb .share-toggle input { margin: 0; }

.pool-thumb .share-status {
  position: absolute; top: 3px; left: 3px;
  font-size: 12px;
  filter: drop-shadow(0 1px 2px rgba(0,0,0,.5));
}

/* ── Config card ────────────────────────────── */
.config-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 20px 22px;
  margin-bottom: 14px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.config-section { display: flex; flex-direction: column; gap: 12px; }
.config-row { flex-direction: row; align-items: center; justify-content: space-between; gap: 0; }

.config-label {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text3);
}

.config-info { display: flex; flex-direction: column; gap: 2px; }
.config-desc { font-size: 13px; color: var(--text2); }

.config-divider { height: 1px; background: var(--border); }

/* Segmented control */
.seg-control {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  background: rgba(255,255,255,.04);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 4px;
  gap: 3px;
}

.seg-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1px;
  padding: 9px 6px;
  background: transparent;
  border: none;
  border-radius: 9px;
  cursor: pointer;
  transition: all .18s;
  color: var(--text3);
}
.seg-btn:hover { color: var(--text2); background: rgba(255,255,255,.05); }
.seg-btn.active {
  background: linear-gradient(135deg, rgba(157,92,255,.35), rgba(224,64,160,.2));
  color: #d4aaff;
  box-shadow: 0 0 0 1px rgba(157,92,255,.4);
}

.seg-grid { font-size: 14px; font-weight: 700; }
.seg-level { font-size: 10px; font-weight: 500; opacity: .8; }

/* Switch */
.switch { position: relative; flex-shrink: 0; }
.switch input { display: none; }
.switch-track {
  display: block;
  width: 44px; height: 24px;
  background: rgba(255,255,255,.1);
  border: 1px solid var(--border2);
  border-radius: 999px;
  position: relative;
  transition: background .2s;
  cursor: pointer;
}
.switch input:checked + .switch-track {
  background: linear-gradient(90deg, var(--p1), var(--p2));
  border-color: transparent;
}
.switch-thumb {
  position: absolute;
  top: 2px; left: 2px;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: white;
  box-shadow: 0 1px 4px rgba(0,0,0,.3);
  transition: transform .2s;
}
.switch input:checked + .switch-track .switch-thumb { transform: translateX(20px); }

/* ── Start button ───────────────────────────── */
.btn-start {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: linear-gradient(135deg, #9d5cff 0%, #e040a0 100%);
  border: none;
  border-radius: var(--r);
  padding: 17px;
  color: white;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: all .18s;
  box-shadow: 0 4px 24px rgba(157,92,255,.35);
  margin-bottom: 22px;
  letter-spacing: .2px;
}
.btn-start:hover { transform: translateY(-2px); box-shadow: 0 8px 32px rgba(157,92,255,.45); }
.btn-start:active { transform: translateY(0); }
.btn-start:disabled {
  background: rgba(255,255,255,.06);
  color: var(--text3);
  box-shadow: none;
  cursor: not-allowed;
  transform: none;
}

/* ── Gallery card ───────────────────────────── */
.gallery-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--r);
  overflow: hidden;
}

.gallery-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
}

.gallery-head-left { display: flex; align-items: center; gap: 12px; }
.gallery-icon { font-size: 22px; }
.gallery-title { font-size: 15px; font-weight: 700; }
.gallery-sub { font-size: 12px; color: var(--text3); margin-top: 1px; }

.public-gallery-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(88px, 1fr));
  gap: 10px;
  padding: 16px;
  min-height: 60px;
}

.gallery-empty {
  grid-column: 1/-1;
  color: var(--text3);
  font-size: 13px;
  text-align: center;
  padding: 8px 0;
}

.gallery-thumb {
  position: relative;
  overflow: hidden;
  aspect-ratio: 1;
  border-radius: 10px;
  background-size: cover;
  background-position: center;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all .18s;
}
.gallery-thumb:hover {
  transform: scale(1.06);
  border-color: var(--p3);
  box-shadow: 0 0 14px rgba(56,189,248,.3);
}
.gallery-owner {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 12px 6px 4px;
  background: linear-gradient(to top, rgba(0,0,0,.72), transparent);
}
.gallery-owner-avatar {
  width: 16px; height: 16px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  border: 1px solid rgba(255,255,255,.5);
}
.gallery-owner-name {
  font-size: 11px;
  color: #fff;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ── 导航栏头像 ─────────────────────────────── */
.badge-avatar {
  width: 22px; height: 22px;
  border-radius: 50%;
  object-fit: cover;
  margin: -2px 0;
}
/* 有头像时隐藏默认的 lucide 用户图标 */
.user-btn.has-avatar > svg,
.user-btn.has-avatar > .icon { display: none; }

/* ── 头像上传（个人资料弹窗）──────────────────── */
.avatar-edit {
  position: relative;
  width: 88px; height: 88px;
  margin: 0 auto 14px;
  border-radius: 50%;
  border: 2px solid var(--border2);
  background: var(--surface);
  cursor: pointer;
  display: block;
  padding: 0;
  overflow: visible;
  transition: border-color .18s;
}
.avatar-edit:hover { border-color: var(--p1); }
.avatar-preview {
  width: 100%; height: 100%;
  border-radius: 50%;
  object-fit: cover;
  display: block;
}
.avatar-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text3);
}
.avatar-edit-badge {
  position: absolute;
  right: -2px; bottom: -2px;
  width: 28px; height: 28px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--p1), var(--p2));
  border: 2px solid var(--card);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
}

/* ── Game HUD ───────────────────────────────── */
.hud {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--r2);
  padding: 12px 18px;
  margin-bottom: 16px;
}

.hud-stats { display: flex; align-items: center; gap: 0; }

.hud-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0 18px;
}
.hud-stat:first-child { padding-left: 0; }

.hud-val {
  font-size: 20px;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  line-height: 1;
  color: var(--text);
}
.hud-key {
  font-size: 10px;
  color: var(--text3);
  text-transform: uppercase;
  letter-spacing: .5px;
  margin-top: 3px;
}

.hud-divider { width: 1px; height: 32px; background: var(--border2); }

.hud-actions { display: flex; gap: 8px; align-items: center; }

.hud-btn {
  width: 38px; height: 38px;
  border-radius: 10px;
  border: 1px solid var(--border2);
  background: rgba(255,255,255,.06);
  color: var(--text2);
  font-size: 16px;
  cursor: pointer;
  transition: all .15s;
  display: flex; align-items: center; justify-content: center;
}
.hud-btn:hover { background: rgba(255,255,255,.11); color: var(--text); }
.hud-btn:active { transform: scale(.93); }

.hud-btn-back {
  width: auto;
  padding: 0 14px;
  font-size: 13px;
  font-weight: 600;
  gap: 4px;
}

/* ── Puzzle board ───────────────────────────── */
.puzzle-board {
  position: relative;
  margin: 0 auto;
  background: var(--surface);
  border-radius: var(--r);
  box-shadow: 0 20px 60px rgba(0,0,0,.5), 0 0 0 1px var(--border);
  overflow: hidden;
  touch-action: none;
}

.puzzle-piece {
  position: absolute;
  background-repeat: no-repeat;
  cursor: grab;
  border: 1px solid rgba(255,255,255,.06);
}
.puzzle-piece.dragging {
  cursor: grabbing;
  z-index: 10;
  box-shadow: 0 16px 40px rgba(0,0,0,.5), 0 0 0 2px var(--p1);
  opacity: .92;
}
.puzzle-piece.placed { border-color: transparent; }
.puzzle-piece.blind:not(.placed) { filter: brightness(.3) saturate(.15); }

/* ── Modal ──────────────────────────────────── */
.modal {
  display: none;
  position: fixed; inset: 0;
  background: rgba(0,0,0,.65);
  backdrop-filter: blur(8px);
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 20px;
}
.modal.active { display: flex; }

.modal-card {
  background: var(--card);
  border: 1px solid var(--border2);
  border-radius: 24px;
  padding: 36px 28px;
  text-align: center;
  max-width: 340px;
  width: 100%;
  box-shadow: 0 24px 60px rgba(0,0,0,.5), 0 0 40px rgba(157,92,255,.1);
}

.modal-icon { font-size: 40px; margin-bottom: 10px; }
.modal-title { font-size: 20px; font-weight: 800; margin-bottom: 6px; }
.modal-desc { color: var(--text3); font-size: 13px; margin-bottom: 20px; }

.text-input {
  width: 100%;
  padding: 12px 16px;
  border-radius: 12px;
  border: 1px solid var(--border2);
  background: rgba(255,255,255,.05);
  color: var(--text);
  font-size: 15px;
  outline: none;
  transition: border-color .18s, box-shadow .18s;
}
.text-input::placeholder { color: var(--text3); }
.text-input:focus {
  border-color: var(--p1);
  box-shadow: 0 0 0 3px rgba(157,92,255,.18);
}

.modal-actions, .win-actions {
  display: flex;
  gap: 10px;
  justify-content: center;
  margin-top: 20px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--p1), var(--p2));
  border: none;
  border-radius: 999px;
  padding: 11px 26px;
  color: white;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: all .18s;
  box-shadow: 0 2px 14px rgba(157,92,255,.35);
}
.btn-primary:hover { box-shadow: 0 4px 20px rgba(157,92,255,.5); transform: translateY(-1px); }

.btn-ghost-dark {
  background: rgba(255,255,255,.07);
  border: 1px solid var(--border2);
  border-radius: 999px;
  padding: 11px 22px;
  color: var(--text2);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all .18s;
}
.btn-ghost-dark:hover { background: rgba(255,255,255,.11); color: var(--text); }

/* ── Win modal ──────────────────────────────── */
.win-emoji {
  font-size: 54px;
  display: block;
  margin-bottom: 6px;
  animation: pop .5s ease infinite alternate;
}
@keyframes pop {
  from { transform: scale(1); }
  to   { transform: scale(1.12) rotate(5deg); }
}

.win-title {
  font-size: 26px;
  font-weight: 900;
  background: linear-gradient(120deg, #b57aff, #ff5fad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 20px;
}

.win-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  background: rgba(255,255,255,.04);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px 0;
}

.win-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  flex: 1;
}
.win-val {
  font-size: 30px;
  font-weight: 900;
  font-variant-numeric: tabular-nums;
  color: var(--text);
  line-height: 1;
}
.win-key {
  font-size: 11px;
  color: var(--text3);
  text-transform: uppercase;
  letter-spacing: .5px;
}
.win-sep { width: 1px; height: 44px; background: var(--border2); }

/* ── Lucide icons ───────────────────────────── */
.icon { width: 16px; height: 16px; display: inline-block; vertical-align: middle; flex-shrink: 0; }
.icon svg { width: 100%; height: 100%; stroke-width: 2; display: block; }
.icon-xs  { width: 12px; height: 12px; }
.icon-lg  { width: 20px; height: 20px; }
.icon-xl  { width: 32px; height: 32px; }
.icon-2xl { width: 40px; height: 40px; }

/* 上传区图标颜色 */
.drop-icon .icon svg { stroke: var(--p1); stroke-width: 1.5; }
/* 图库图标颜色 */
.gallery-icon .icon svg { stroke: var(--p3); }
/* 昵称弹窗图标颜色 */
.modal-icon .icon svg { stroke: #fbbf24; stroke-width: 1.5; }

/* ── Auth screen ────────────────────────────── */
.auth-screen {
  display: none;
  max-width: 100% !important;
  padding: 0 !important;
  min-height: 100vh;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}
.auth-screen.active { display: flex !important; }

/* 背景装饰 */
.auth-bg { position: absolute; inset: 0; pointer-events: none; }
.auth-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: .55;
}
.auth-blob-1 {
  width: 480px; height: 480px;
  background: radial-gradient(circle, rgba(157,92,255,.55), transparent 70%);
  top: -160px; left: -140px;
}
.auth-blob-2 {
  width: 380px; height: 380px;
  background: radial-gradient(circle, rgba(224,64,160,.4), transparent 70%);
  bottom: -100px; right: -80px;
}
.auth-blob-3 {
  width: 280px; height: 280px;
  background: radial-gradient(circle, rgba(56,189,248,.3), transparent 70%);
  top: 50%; left: 60%;
  transform: translate(-50%,-50%);
}

/* 内容包裹 */
.auth-wrap {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 420px;
  margin: 0 auto;
  padding: 48px 24px 40px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 32px;
}

/* 品牌区 */
.auth-brand { text-align: center; }

.auth-logo {
  font-size: 64px;
  display: block;
  margin-bottom: 14px;
  filter: drop-shadow(0 0 24px rgba(157,92,255,.7));
  animation: auth-float 3.5s ease-in-out infinite;
}
@keyframes auth-float {
  0%,100% { transform: translateY(0) rotate(-3deg); }
  50%      { transform: translateY(-10px) rotate(3deg); }
}

.auth-brand-name {
  font-size: 40px;
  font-weight: 900;
  letter-spacing: -1.5px;
  line-height: 1;
  margin-bottom: 10px;
  background: linear-gradient(120deg, #c084fc 0%, #f472b6 45%, #38bdf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.auth-brand-sub {
  font-size: 14px;
  color: var(--text3);
  letter-spacing: .3px;
}

/* 卡片 */
.auth-card {
  width: 100%;
  background: rgba(16,16,40,.75);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: 28px;
  padding: 32px 28px;
  box-shadow:
    0 40px 100px rgba(0,0,0,.55),
    0 0 0 1px rgba(157,92,255,.12),
    inset 0 1px 0 rgba(255,255,255,.07);
}

/* 标签 */
.auth-tabs {
  display: flex;
  gap: 4px;
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 14px;
  padding: 4px;
  margin-bottom: 26px;
}
.auth-tab {
  flex: 1;
  padding: 10px;
  border: none;
  border-radius: 10px;
  background: transparent;
  color: var(--text3);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: all .2s;
  letter-spacing: .2px;
}
.auth-tab:hover { color: var(--text2); background: rgba(255,255,255,.04); }
.auth-tab.active {
  background: linear-gradient(135deg, rgba(157,92,255,.4) 0%, rgba(224,64,160,.25) 100%);
  color: #e0b8ff;
  box-shadow: 0 0 0 1px rgba(157,92,255,.45), 0 2px 8px rgba(157,92,255,.2);
}

/* 表单 */
.auth-form { display: flex; flex-direction: column; gap: 14px; }

.auth-field {
  position: relative;
  display: flex;
  align-items: center;
}
.auth-field-icon {
  position: absolute;
  left: 15px;
  color: var(--text3);
  pointer-events: none;
  display: flex;
  align-items: center;
  transition: color .2s;
}
.auth-field:focus-within .auth-field-icon { color: var(--p1); }

.auth-input {
  width: 100%;
  padding: 14px 16px 14px 44px;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,.1);
  background: rgba(255,255,255,.05);
  color: var(--text);
  font-size: 15px;
  outline: none;
  transition: all .2s;
}
.auth-input::placeholder { color: var(--text3); }
.auth-input:focus {
  border-color: var(--p1);
  box-shadow: 0 0 0 3px rgba(157,92,255,.2);
  background: rgba(157,92,255,.07);
}
.auth-input-pwd { padding-right: 60px; }

.auth-pwd-toggle {
  position: absolute;
  right: 14px;
  background: none;
  border: none;
  color: var(--text3);
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  padding: 4px 6px;
  border-radius: 6px;
  transition: all .18s;
  letter-spacing: .3px;
}
.auth-pwd-toggle:hover { color: var(--text2); background: rgba(255,255,255,.07); }

.auth-error {
  font-size: 13px;
  color: #f87171;
  min-height: 16px;
  padding: 0 4px;
  display: flex;
  align-items: center;
  gap: 5px;
}
.auth-error:not(:empty)::before { content: '⚠ '; }

.auth-submit-btn {
  width: 100%;
  padding: 15px;
  background: linear-gradient(135deg, #9d5cff 0%, #e040a0 100%);
  border: none;
  border-radius: 14px;
  color: white;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: all .2s;
  box-shadow: 0 4px 24px rgba(157,92,255,.45);
  letter-spacing: .4px;
  margin-top: 4px;
  position: relative;
  overflow: hidden;
}
.auth-submit-btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,.15), transparent);
  opacity: 0;
  transition: opacity .2s;
}
.auth-submit-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 32px rgba(157,92,255,.55); }
.auth-submit-btn:hover::after { opacity: 1; }
.auth-submit-btn:active { transform: translateY(0); }
.auth-submit-btn:disabled { opacity: .55; cursor: not-allowed; transform: none; box-shadow: none; }

.auth-footer {
  font-size: 12px;
  color: var(--text3);
  opacity: .7;
}

/* 分隔线 「或」 */
.auth-divider {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 16px 0 4px;
  color: var(--text3);
  font-size: 12px;
}
.auth-divider::before,
.auth-divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: rgba(255,255,255,.12);
}

/* 游客试玩按钮 */
.auth-guest-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  width: 100%;
  padding: 13px;
  margin-top: 10px;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,.16);
  background: rgba(255,255,255,.05);
  color: var(--text1);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background .2s, border-color .2s, transform .15s;
}
.auth-guest-btn:hover { background: rgba(255,255,255,.1); border-color: rgba(255,255,255,.28); }
.auth-guest-btn:active { transform: translateY(1px); }
.auth-guest-btn:disabled { opacity: .55; cursor: not-allowed; }
.auth-guest-hint {
  margin-top: 8px;
  font-size: 11px;
  color: var(--text3);
  text-align: center;
  opacity: .75;
}

/* 退出登录按钮 */
.btn-logout {
  display: block;
  width: 100%;
  margin-top: 16px;
  padding: 9px;
  background: none;
  border: none;
  color: var(--text3);
  font-size: 13px;
  cursor: pointer;
  transition: color .18s;
}
.btn-logout:hover { color: #f87171; }

/* ── Screen tabs ────────────────────────────── */
.screen-tabs {
  display: flex;
  gap: 4px;
  background: rgba(255,255,255,.04);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 4px;
  margin-bottom: 16px;
}

.tab-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 9px 6px;
  border: none;
  border-radius: 10px;
  background: transparent;
  color: var(--text3);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all .18s;
  white-space: nowrap;
}
.tab-btn:hover { color: var(--text2); background: rgba(255,255,255,.05); }
.tab-btn.active {
  background: linear-gradient(135deg, rgba(157,92,255,.3), rgba(224,64,160,.15));
  color: #d4aaff;
  box-shadow: 0 0 0 1px rgba(157,92,255,.35);
}

.tab-pane { display: none; }
.tab-pane.active { display: block; }

/* ── Library tab ─────────────────────────────── */
.lib-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}
.lib-header-info { flex: 1; min-width: 0; }
.lib-title { font-size: 15px; font-weight: 700; color: var(--text); }
.lib-sub { font-size: 12px; color: var(--text3); margin-top: 2px; }

.btn-lib-upload {
  display: flex;
  align-items: center;
  gap: 7px;
  background: linear-gradient(135deg, var(--p1), var(--p2));
  border: none;
  border-radius: 12px;
  padding: 10px 16px;
  color: white;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all .18s;
  flex-shrink: 0;
  box-shadow: 0 2px 12px rgba(157,92,255,.3);
}
.btn-lib-upload:hover { box-shadow: 0 4px 18px rgba(157,92,255,.45); transform: translateY(-1px); }
.btn-lib-upload:disabled { opacity: .5; cursor: not-allowed; transform: none; box-shadow: none; }

.lib-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: 10px;
  min-height: 100px;
}

.lib-card {
  aspect-ratio: 1;
  border-radius: 12px;
  background-size: cover;
  background-position: center;
  border: 2px solid transparent;
  position: relative;
  overflow: hidden;
  transition: all .18s;
}
.lib-card:hover { border-color: var(--p1); transform: scale(1.04); }

.lib-card-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,.55);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  opacity: 0;
  transition: opacity .18s;
}
.lib-card:hover .lib-card-overlay { opacity: 1; }

.lib-btn {
  width: 34px; height: 34px;
  border-radius: 50%;
  border: none;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  font-size: 13px;
  transition: transform .15s;
}
.lib-btn:hover { transform: scale(1.12); }
.lib-btn:active { transform: scale(.92); }
.lib-play-btn { background: var(--p1); color: white; }
.lib-del-btn { background: rgba(255,60,60,.85); color: white; }

/* ── History tab ─────────────────────────────── */
.history-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}
.history-clear {
  font-size: 12px;
  padding: 6px 14px;
}

.history-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.history-item {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--r2);
  padding: 12px 14px;
  transition: border-color .18s;
}
.history-item:hover { border-color: var(--border2); }

.history-thumb {
  width: 60px; height: 60px;
  border-radius: 8px;
  background: var(--surface);
  background-size: cover;
  background-position: center;
  flex-shrink: 0;
  border: 1px solid var(--border);
}

.history-info { flex: 1; min-width: 0; }

.history-meta {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 5px;
}

.history-stats {
  display: flex;
  gap: 12px;
  font-size: 12px;
  color: var(--text2);
}

.history-replay {
  flex-shrink: 0;
  font-size: 12px;
  padding: 7px 14px;
  border-radius: 10px;
}

/* ── Scrollbar ──────────────────────────────── */
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 99px; }

/* ── Responsive · Tablet (≤768px) ───────────── */
@media (max-width: 768px) {
  .lib-grid { grid-template-columns: repeat(auto-fill, minmax(88px, 1fr)); gap: 8px; }
}
  .screen { padding: 20px 14px 60px; }

  .hero { padding: 28px 0 22px; }
  .hero-title { font-size: 38px; letter-spacing: -1px; }

  .hud { padding: 10px 14px; gap: 8px; }
  .hud-stat { padding: 0 12px; }
  .hud-val { font-size: 18px; }

  .public-gallery-list {
    grid-template-columns: repeat(auto-fill, minmax(76px, 1fr));
    gap: 8px;
    padding: 12px;
  }
}

/* ── Responsive · Mobile (≤480px) ───────────── */
@media (max-width: 480px) {
  .tab-btn { font-size: 12px; gap: 4px; padding: 8px 4px; }
  .lib-header { gap: 8px; }
  .btn-lib-upload { font-size: 12px; padding: 9px 12px; }
  .lib-grid { grid-template-columns: repeat(auto-fill, minmax(76px, 1fr)); gap: 7px; }
  .history-item { gap: 10px; padding: 10px 12px; }
  .history-thumb { width: 52px; height: 52px; }
  .history-meta { font-size: 13px; }
}
  /* Navbar */
  .navbar { padding: 0 14px; height: 54px; }
  .brand-name { font-size: 17px; }
  .brand-icon { font-size: 20px; }
  .user-btn { padding: 6px 11px; font-size: 12px; }

  /* Screen */
  .screen { padding: 16px 12px 56px; }

  /* Hero */
  .hero { padding: 24px 0 18px; }
  .hero-badge { font-size: 11px; padding: 3px 11px; margin-bottom: 12px; }
  .hero-title { font-size: 32px; letter-spacing: -.8px; }
  .hero-sub { font-size: 13px; }

  /* Upload */
  .drop-zone { padding: 16px 14px; gap: 12px; }
  .drop-icon { font-size: 28px; }
  .drop-text { font-size: 14px; }

  /* Image pool */
  .pool-thumb { width: 70px; height: 70px; }
  .image-pool { padding: 10px 12px; gap: 8px; }

  /* Config */
  .config-card { padding: 16px 14px; gap: 14px; }

  /* Segmented control — 2×2 grid on very small screens */
  .seg-control {
    grid-template-columns: repeat(2, 1fr);
    gap: 4px;
  }
  .seg-grid { font-size: 13px; }

  /* Start button */
  .btn-start { font-size: 15px; padding: 15px; border-radius: 14px; }

  /* Gallery */
  .gallery-head { padding: 12px 14px; }
  .gallery-title { font-size: 14px; }
  .public-gallery-list {
    grid-template-columns: repeat(auto-fill, minmax(68px, 1fr));
    gap: 7px;
    padding: 10px 12px;
  }

  /* HUD */
  .hud { flex-direction: column; align-items: stretch; padding: 10px 12px; }
  .hud-stats { justify-content: space-around; }
  .hud-stat { padding: 0 8px; }
  .hud-val { font-size: 20px; }
  .hud-actions { justify-content: center; gap: 6px; }
  .hud-btn { width: 42px; height: 42px; border-radius: 11px; font-size: 17px; }
  .hud-btn-back { width: auto; padding: 0 16px; font-size: 13px; }

  /* Win modal */
  .modal-card { padding: 28px 20px; border-radius: 20px; }
  .win-emoji { font-size: 46px; }
  .win-title { font-size: 22px; }
  .win-val { font-size: 26px; }

  /* Buttons */
  .btn-primary, .btn-ghost-dark {
    padding: 12px 20px;
    font-size: 14px;
  }
}

/* ── Responsive · Small phones (≤360px) ──────── */
@media (max-width: 360px) {
  .hero-title { font-size: 28px; }
  .seg-control { gap: 3px; padding: 3px; }
  .seg-btn { padding: 8px 4px; }
}