* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: #f5f7fb;
  color: #1f2937;
}

.app-shell {
  min-height: 100vh;
  padding: 16px;
  display: flex;
  align-items: flex-start;
  justify-content: center;
}

.app-card {
  width: 100%;
  max-width: 920px;
  height: calc(100vh - 32px);
  margin: 0 auto;
  background: #ffffff;
  border-radius: 16px;
  box-shadow: 0 10px 35px rgba(15, 23, 42, 0.08);
  padding: 18px;
  display: flex;
  flex-direction: column;
}

.app-header {
  margin-bottom: 12px;
}

h1 {
  margin: 0;
  font-size: 26px;
}

h2 {
  margin: 0;
  font-size: 20px;
}

.sub {
  margin: 4px 0 0;
  color: #6b7280;
  font-size: 14px;
}

.hidden {
  display: none !important;
}

.access-section {
  margin-top: 48px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.access-section .inline-form {
  width: 100%;
  max-width: 420px;
}

.access-section .msg {
  width: 100%;
  max-width: 420px;
  text-align: left;
}

.inline-form {
  display: flex;
  gap: 10px;
}

.main-section {
  display: flex;
  flex-direction: column;
  min-height: 0;
  flex: 1;
}

.top-bar {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 10px;
}

.info-chip {
  background: #f8fafc;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  padding: 10px 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 48px;
}

.chip-label {
  color: #6b7280;
  font-size: 13px;
}

.chip-value {
  font-weight: 600;
  font-size: 14px;
}

.timer {
  color: #b45309;
}

.control-bar {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 10px;
  margin-bottom: 8px;
}

.join-group {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  gap: 10px;
}

.msg {
  margin: 0 0 10px;
  color: #6b7280;
  min-height: 20px;
  font-size: 14px;
}

input,
textarea,
button,
select {
  font: inherit;
}

input,
textarea,
select {
  width: 100%;
  border: 1px solid #d1d5db;
  border-radius: 10px;
  padding: 10px 12px;
  outline: none;
  background: #fff;
}

input:focus,
textarea:focus,
select:focus {
  border-color: #4f46e5;
}

button {
  border: none;
  border-radius: 10px;
  padding: 10px 16px;
  background: #4f46e5;
  color: #fff;
  cursor: pointer;
  white-space: nowrap;
}

button:hover {
  opacity: 0.95;
}

button.secondary {
  background: #64748b;
}

button.danger {
  background: #dc2626;
}

button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.chat-panel {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
}

.chat-list {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  background: #f9fafb;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  padding: 12px;
}

.chat-item {
  margin-bottom: 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.chat-item .meta {
  font-size: 12px;
  color: #6b7280;
}

.chat-item .bubble {
  display: inline-block;
  max-width: 85%;
  padding: 10px 12px;
  border-radius: 10px;
  line-height: 1.6;
  word-break: break-word;
}

.chat-item.self .bubble {
  background: #e0e7ff;
}

.chat-item.peer .bubble {
  background: #ecfeff;
}

.chat-item.system .bubble {
  background: #fef3c7;
}

.composer {
  margin-top: 10px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  align-items: end;
}

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

textarea {
  resize: none;
}

.bubble-media {
  display: block;
  width: min(320px, 80vw);
  max-width: 100%;
  border-radius: 10px;
  cursor: zoom-in;
}

.bubble-file-name {
  margin-top: 6px;
  font-size: 12px;
  color: #475569;
}

.video-cover-wrap {
  position: relative;
  display: inline-block;
  cursor: pointer;
}

.video-play-badge {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 52px;
  height: 52px;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.5);
  color: #fff;
  font-size: 24px;
  line-height: 52px;
  text-align: center;
  pointer-events: none;
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 30;
}

.modal-mask {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.45);
}

.modal-panel {
  position: relative;
  z-index: 31;
  width: calc(100% - 32px);
  max-width: 420px;
  margin: 64px auto 0;
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 18px 48px rgba(15, 23, 42, 0.2);
  padding: 18px;
}

.viewer-panel {
  position: relative;
  z-index: 31;
  width: calc(100% - 20px);
  max-width: 960px;
  margin: 16px auto;
  height: calc(100vh - 32px);
  display: flex;
  align-items: center;
  justify-content: center;
}

.viewer-media {
  max-width: 100%;
  max-height: 100%;
  border-radius: 12px;
  box-shadow: 0 18px 48px rgba(15, 23, 42, 0.35);
  background: #000;
}

.viewer-close-btn {
  position: absolute;
  top: 6px;
  right: 6px;
  z-index: 32;
}

.viewer-nav-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 32;
  width: 40px;
  height: 40px;
  font-size: 30px;
  background: rgba(229, 231, 235, 0.85);
}

.viewer-prev-btn {
  left: 6px;
}

.viewer-next-btn {
  right: 6px;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.modal-sub {
  margin: 0 0 14px;
  color: #6b7280;
  font-size: 14px;
  line-height: 1.6;
}

.icon-btn {
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: 999px;
  font-size: 20px;
  line-height: 1;
  background: #e5e7eb;
  color: #111827;
}

.qr-box {
  display: flex;
  justify-content: center;
  margin-bottom: 14px;
}

#qr-canvas {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  padding: 8px;
}

.qr-link-group {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
}

@media (max-width: 720px) {
  .app-card {
    height: auto;
    min-height: calc(100vh - 32px);
  }

  .top-bar {
    grid-template-columns: 1fr;
  }

  .control-bar {
    grid-template-columns: 1fr;
  }

  .join-group {
    grid-template-columns: 1fr;
  }

  .composer {
    grid-template-columns: 1fr;
  }

  .composer-actions {
    grid-template-columns: 1fr;
  }

  .inline-form {
    flex-direction: column;
  }

  .qr-link-group {
    grid-template-columns: 1fr;
  }

  button {
    width: 100%;
  }

  .chat-list {
    min-height: 320px;
  }
}