:root {
  --paper: #f4efe7;
  --paper-raised: #fbf8f3;
  --ink: #1f1b16;
  --ink-2: #5b5349;
  --ink-3: #8b8276;
  --line: rgba(31, 27, 22, 0.12);
  --accent: #b9622f;

  --stage: #0c0c0d;
  --on-stage: #f4f2ee;
  --on-stage-2: rgba(244, 242, 238, 0.66);
  --glass: rgba(30, 30, 32, 0.62);
  --glass-line: rgba(255, 255, 255, 0.1);

  --live: #3fcf7c;
  --wait: #a19a90;
  --warn: #f0b443;
  --danger: #d9433f;

  --radius: 16px;
  --gutter: 16px;
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Noto Sans CJK SC",
    "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
  --font-serif: "Songti SC", "Noto Serif CJK SC", "Source Han Serif SC", STSong, Georgia, serif;
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);

  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #16130f;
    --paper-raised: #211c17;
    --ink: #f1ebe2;
    --ink-2: #bcb3a6;
    --ink-3: #8a8276;
    --line: rgba(241, 235, 226, 0.12);
    --accent: #e08a55;
    color-scheme: dark;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  height: 100%;
}

body {
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.55 var(--font-sans);
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  text-rendering: optimizeLegibility;
}

body:has(#stage:not([hidden])) {
  background: var(--stage);
}

[hidden] {
  display: none !important;
}

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

svg {
  width: 20px;
  height: 20px;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

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

/* ---------- 按钮 ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 18px;
  border: 0;
  border-radius: 999px;
  font: inherit;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
  transition: transform 0.15s var(--ease), background-color 0.2s, opacity 0.2s;
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: var(--ink);
  color: var(--paper);
}

.btn-lg {
  width: 100%;
  min-height: 58px;
  border-radius: 18px;
  font-size: 17px;
}

.btn-quiet {
  background: var(--line);
  color: var(--ink);
}

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

.btn-glass {
  min-height: 36px;
  padding: 0 14px;
  background: var(--glass);
  border: 1px solid var(--glass-line);
  color: var(--on-stage);
  font-size: 14px;
  font-weight: 500;
  backdrop-filter: blur(14px) saturate(1.4);
  -webkit-backdrop-filter: blur(14px) saturate(1.4);
}

.btn-glass svg {
  width: 16px;
  height: 16px;
}

.btn-icon {
  width: 36px;
  padding: 0;
}

.btn-end {
  color: #ffb4ae;
}

/* ---------- 首页 ---------- */

.landing,
.notice {
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: max(32px, env(safe-area-inset-top)) var(--gutter) max(32px, env(safe-area-inset-bottom));
}

.landing-inner,
.notice-inner {
  width: 100%;
  max-width: 400px;
  text-align: center;
}

h1,
h2 {
  font-family: var(--font-serif);
  font-weight: 600;
  letter-spacing: 0.02em;
  margin: 0;
}

h1 {
  font-size: 34px;
  line-height: 1.2;
}

.lede {
  margin: 12px auto 32px;
  max-width: 22em;
  color: var(--ink-2);
}

.promises {
  list-style: none;
  margin: 32px 0 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--line);
  text-align: left;
  font-size: 14px;
  color: var(--ink-3);
  display: grid;
  gap: 10px;
}

.promises li {
  position: relative;
  padding-left: 22px;
}

.promises li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 0.62em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.8;
}

.promises strong {
  color: var(--ink);
  font-weight: 600;
}

/* 一叠洗出来的照片，呼应“纸质相册” */
.prints {
  position: relative;
  width: 220px;
  height: 150px;
  margin: 0 auto 28px;
}

.prints span {
  position: absolute;
  left: 50%;
  top: 10px;
  width: 104px;
  height: 128px;
  margin-left: -52px;
  border: 6px solid #fffdf8;
  border-bottom-width: 22px;
  border-radius: 3px;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.08), 0 10px 24px -8px rgba(60, 40, 20, 0.35);
  animation: fan 0.9s var(--ease) both;
}

.prints span:nth-child(1) {
  background: linear-gradient(170deg, #b8dfe0 0%, #5b8fae 58%, #24425f 100%);
  --r: -13deg;
  --x: -46px;
}

.prints span:nth-child(2) {
  background: linear-gradient(165deg, #edf0cf 0%, #a7b788 52%, #5b7d58 100%);
  --r: 11deg;
  --x: 46px;
}

.prints span:nth-child(3) {
  background: linear-gradient(160deg, #f8cf86 0%, #e3845f 52%, #6f5a7d 100%);
  --r: -2deg;
  --x: 0px;
  top: 4px;
}

@keyframes fan {
  from {
    transform: translateX(0) rotate(0deg);
    opacity: 0;
  }
  to {
    transform: translateX(var(--x)) rotate(var(--r));
    opacity: 1;
  }
}

.prints-closed span {
  animation: none;
  transform: translateX(calc(var(--x) * 0.15)) rotate(calc(var(--r) * 0.3));
  filter: grayscale(0.5);
  opacity: 0.7;
}

.notice h2 {
  font-size: 26px;
}

.notice p {
  color: var(--ink-2);
  margin: 10px auto 28px;
  max-width: 22em;
}

/* ---------- 舞台 ---------- */

.stage {
  position: fixed;
  inset: 0;
  background: var(--stage);
  color: var(--on-stage);
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  grid-template-columns: minmax(0, 1fr); /* 缩略条再长也不能把舞台撑宽 */
  overflow: hidden;
  overflow: clip;
}

.bar {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  padding-left: max(var(--gutter), env(safe-area-inset-left));
  padding-right: max(var(--gutter), env(safe-area-inset-right));
}

.bar-top {
  justify-content: space-between;
  gap: 12px;
  padding-top: max(12px, env(safe-area-inset-top));
  padding-bottom: 10px;
}

.bar-bottom {
  flex-direction: column;
  align-items: stretch;
  gap: 8px;
  padding-top: 8px;
  padding-bottom: max(12px, env(safe-area-inset-bottom));
}

.actions {
  display: flex;
  gap: 8px;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
  min-height: 36px;
  padding: 0 14px;
  border-radius: 999px;
  background: var(--glass);
  border: 1px solid var(--glass-line);
  font-size: 13px;
  color: var(--on-stage);
  backdrop-filter: blur(14px) saturate(1.4);
  -webkit-backdrop-filter: blur(14px) saturate(1.4);
  white-space: nowrap;
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--wait);
  flex: none;
}

.chip[data-state="live"] .dot {
  background: var(--live);
  box-shadow: 0 0 0 0 rgba(63, 207, 124, 0.6);
  animation: pulse 2.4s infinite;
}

.chip[data-state="warn"] .dot {
  background: var(--warn);
}

@keyframes pulse {
  70% {
    box-shadow: 0 0 0 7px rgba(63, 207, 124, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(63, 207, 124, 0);
  }
}

.frame {
  position: relative;
  min-height: 0;
  overflow: hidden;
  user-select: none;
  -webkit-user-select: none;
}

.photo {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  opacity: 0;
  transform: translateX(var(--shift, 0px));
  transition: opacity 0.32s ease, transform 0.42s var(--ease);
  pointer-events: none; /* 观看端长按不弹“存储图像” */
  -webkit-touch-callout: none;
  -webkit-user-drag: none;
}

.photo.is-front {
  opacity: 1;
  transform: none;
}

.photo.no-anim {
  transition: none;
}

.placeholder {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 14px;
  padding: var(--gutter);
  text-align: center;
  color: var(--on-stage-2);
  font-size: 15px;
}

.placeholder p {
  margin: 0;
  max-width: 20em;
}

.spinner {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.15);
  border-top-color: var(--on-stage);
  animation: spin 0.9s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.counter {
  text-align: center;
  font-size: 13px;
  color: var(--on-stage-2);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
  min-height: 1.5em;
}

/* 分享者 */

.role-host .frame {
  touch-action: none; /* 手势翻页 */
  cursor: pointer;
}

.nav {
  position: absolute;
  top: 50%;
  z-index: 2;
  width: 48px;
  height: 48px;
  margin-top: -24px;
  display: grid;
  place-items: center;
  border: 1px solid var(--glass-line);
  border-radius: 50%;
  background: var(--glass);
  color: var(--on-stage);
  cursor: pointer;
  opacity: 0.75;
  transition: opacity 0.2s, transform 0.15s var(--ease);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.nav:hover {
  opacity: 1;
}

.nav:active {
  transform: scale(0.94);
}

.nav:disabled {
  opacity: 0;
  pointer-events: none;
}

.nav-prev {
  left: max(var(--gutter), env(safe-area-inset-left));
}

.nav-next {
  right: max(var(--gutter), env(safe-area-inset-right));
}

@media (hover: none) {
  .nav {
    display: none; /* 触屏上靠滑动和点按两侧翻页 */
  }
}

.strip {
  position: relative; /* 缩略图的 offsetLeft 以它为基准 */
  display: flex;
  gap: 6px;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scrollbar-width: none;
  margin: 0 calc(-1 * var(--gutter));
  padding: 4px var(--gutter);
}

.strip::-webkit-scrollbar {
  display: none;
}

.thumb {
  position: relative;
  flex: none;
  width: 52px;
  height: 52px;
  padding: 0;
  border: 0;
  border-radius: 10px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.08);
  cursor: pointer;
  opacity: 0.55;
  transition: opacity 0.2s, transform 0.2s var(--ease), box-shadow 0.2s;
}

.thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.thumb.is-current {
  opacity: 1;
  box-shadow: 0 0 0 2px var(--stage), 0 0 0 4px var(--on-stage);
  transform: scale(1.04);
}

.thumb.is-pending {
  cursor: progress;
  opacity: 0.35;
}

.thumb.is-pending::after {
  content: "";
  position: absolute;
  inset: 50% auto auto 50%;
  width: 16px;
  height: 16px;
  margin: -8px 0 0 -8px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.25);
  border-top-color: #fff;
  animation: spin 0.9s linear infinite;
}

.thumb-add {
  display: grid;
  place-items: center;
  opacity: 0.8;
  border: 1px dashed rgba(255, 255, 255, 0.3);
  background: transparent;
  color: var(--on-stage);
}

/* 观看者：照片铺满，信息悬浮 */

.role-viewer .stage {
  display: block;
}

.role-viewer .frame {
  position: absolute;
  inset: 0;
}

.role-viewer .bar {
  position: absolute;
  left: 0;
  right: 0;
  transition: opacity 0.6s ease;
}

.role-viewer .bar-top {
  top: 0;
}

.role-viewer .bar-bottom {
  bottom: 0;
}

.role-viewer .stage.is-idle .bar {
  opacity: 0.12;
}

.role-host .viewer-only,
.role-viewer .host-only {
  display: none !important;
}

/* ---------- 底部弹层 ---------- */

dialog.sheet {
  width: 100%;
  max-width: 440px;
  max-height: calc(100dvh - 24px);
  margin: auto auto 0;
  padding: 10px 20px max(20px, env(safe-area-inset-bottom));
  border: 0;
  border-radius: 24px 24px 0 0;
  background: var(--paper-raised);
  color: var(--ink);
  text-align: center;
  overflow-y: auto;
  box-shadow: 0 -10px 40px rgba(0, 0, 0, 0.25);
}

dialog.sheet[open] {
  animation: sheet-up 0.32s var(--ease);
}

dialog.sheet::backdrop {
  background: rgba(10, 8, 6, 0.5);
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);
}

@keyframes sheet-up {
  from {
    transform: translateY(40px);
    opacity: 0;
  }
}

@media (min-width: 640px) {
  dialog.sheet {
    margin: auto;
    border-radius: 24px;
    padding-top: 24px;
  }
  .sheet-grip {
    display: none;
  }
}

.sheet-grip {
  width: 36px;
  height: 4px;
  margin: 0 auto 14px;
  border-radius: 2px;
  background: var(--line);
}

dialog.sheet h2 {
  font-size: 22px;
}

.sheet-sub {
  margin: 6px auto 18px;
  max-width: 24em;
  font-size: 14px;
  color: var(--ink-2);
}

.qr {
  width: min(232px, 62vw);
  margin: 0 auto 14px;
  padding: 14px;
  border-radius: 18px;
  background: #fff;
  box-shadow: 0 0 0 1px var(--line);
}

.qr img {
  display: block;
  width: 100%;
  aspect-ratio: 1;
}

.segmented {
  display: inline-flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 4px;
  margin-bottom: 14px;
  padding: 3px;
  border-radius: 12px;
  background: var(--line);
}

.segmented button {
  min-height: 30px;
  padding: 0 12px;
  border: 0;
  border-radius: 9px;
  background: transparent;
  color: var(--ink-2);
  font: inherit;
  font-size: 13px;
  cursor: pointer;
}

.segmented button[aria-pressed="true"] {
  background: var(--paper-raised);
  color: var(--ink);
  font-weight: 600;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
}

.link-row {
  display: flex;
  gap: 8px;
  margin-bottom: 14px;
}

.link-row input {
  flex: 1;
  min-width: 0;
  height: 44px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--paper);
  color: var(--ink-2);
  font: 13px/1 ui-monospace, SFMono-Regular, Menlo, monospace;
}

.link-row .btn {
  border-radius: 12px;
}

.upload {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
  font-size: 13px;
  color: var(--ink-2);
  font-variant-numeric: tabular-nums;
}

.upload-bar {
  flex: 1;
  height: 4px;
  border-radius: 2px;
  background: var(--line);
  overflow: hidden;
}

.upload-bar i {
  display: block;
  height: 100%;
  width: 0;
  background: var(--accent);
  transition: width 0.3s ease;
}

.hint {
  margin: 0 0 16px;
  font-size: 12.5px;
  color: var(--ink-3);
}

.hint:empty {
  display: none;
}

dialog.sheet > .btn-primary {
  width: 100%;
  min-height: 50px;
  border-radius: 14px;
}

.sheet-small {
  padding-top: 24px;
}

.sheet-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.sheet-actions .btn {
  min-height: 48px;
  border-radius: 14px;
}

/* ---------- 提示 ---------- */

.toast {
  position: fixed;
  left: 50%;
  bottom: calc(112px + env(safe-area-inset-bottom));
  z-index: 10;
  width: max-content;
  max-width: calc(100% - 2 * var(--gutter));
  padding: 10px 16px;
  border-radius: 12px;
  background: rgba(24, 24, 26, 0.88);
  color: #fff;
  font-size: 14px;
  text-align: center;
  pointer-events: none;
  opacity: 0;
  transform: translate(-50%, 8px);
  transition: opacity 0.25s, transform 0.25s var(--ease);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.toast.is-visible {
  opacity: 1;
  transform: translate(-50%, 0);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
  .photo {
    transform: none !important;
  }
}