* { box-sizing: border-box; }

:root {
  --bg-gradient: linear-gradient(160deg, #ffffff 0%, #e8f1ff 45%, #c5dcff 100%);
  --panel: rgba(255, 255, 255, 0.92);
  --surface: #f0f6ff;
  --border: #c8daf5;
  --text: #1a2b4a;
  --muted: #5a7194;
  --blue: #1a73e8;
  --blue-hover: #1557b0;
  --blue-soft: #e3efff;
  --red: #ea4335;
  --red-hover: #d93025;
  --green: #188038;
  --off: #fdecea;
  --off-text: #c5221f;
  --name-blue: #174ea6;
}

html, body {
  margin: 0;
  height: 100%;
  font-family: "Google Sans", -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg-gradient);
  background-attachment: fixed;
  color: var(--text);
}

.hidden { display: none !important; }

/* ---------- Landing ---------- */
body.landing {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background:
    radial-gradient(circle at 85% 10%, rgba(26, 115, 232, 0.18), transparent 35%),
    radial-gradient(circle at 10% 90%, rgba(66, 133, 244, 0.12), transparent 40%),
    linear-gradient(160deg, #ffffff 0%, #eef4ff 50%, #d4e4ff 100%);
}

.landing-shell {
  width: min(420px, 100%);
}

.landing-brand {
  text-align: center;
  margin-bottom: 28px;
}

.brand-mark {
  width: 56px;
  height: 56px;
  margin: 0 auto 14px;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--blue), #4285f4);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.5px;
  color: white;
  box-shadow: 0 8px 24px rgba(26, 115, 232, 0.25);
}

.landing-brand h1 {
  margin: 0 0 6px;
  font-size: 28px;
  font-weight: 600;
  color: var(--name-blue);
}

.subtitle {
  color: var(--muted);
  margin: 0;
  font-size: 14px;
}

.landing-card {
  background: var(--panel);
  border: 1px solid var(--border);
  padding: 28px 24px;
  border-radius: 16px;
  box-shadow: 0 12px 40px rgba(26, 115, 232, 0.12);
  backdrop-filter: blur(8px);
}

.landing-card label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--name-blue);
  margin-bottom: 8px;
}

.landing-card input {
  width: 100%;
  padding: 12px 14px;
  margin-bottom: 16px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: white;
  color: var(--text);
  font-size: 14px;
}

.landing-card input:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.15);
}

.primary-btn {
  width: 100%;
  background: var(--blue);
  color: white;
  border: none;
  padding: 12px 16px;
  border-radius: 999px;
  font-size: 14px;
  cursor: pointer;
  font-weight: 600;
  box-shadow: 0 4px 14px rgba(26, 115, 232, 0.28);
}

.primary-btn:hover:not(:disabled) { background: var(--blue-hover); }
.primary-btn:disabled { opacity: 0.6; cursor: wait; }

.secondary-btn {
  background: white;
  color: var(--name-blue);
  border: 1px solid var(--border);
  padding: 0 18px;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 600;
  white-space: nowrap;
}

.secondary-btn:hover {
  background: var(--blue-soft);
  border-color: var(--blue);
}

.divider {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--muted);
  margin: 20px 0;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
}

.divider::before,
.divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border);
}

.joinRow { display: flex; gap: 10px; }
.joinRow input { margin-bottom: 0; }
.error { color: #c5221f; font-size: 12px; margin-top: 12px; }

.code-label {
  margin: 0 0 8px;
  font-size: 12px;
  font-weight: 600;
  color: var(--name-blue);
  text-align: center;
}

.meeting-code {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-align: center;
  color: var(--name-blue);
  background: var(--blue-soft);
  border: 2px dashed var(--blue);
  border-radius: 12px;
  padding: 16px 12px;
  margin-bottom: 10px;
  user-select: all;
}

.code-hint {
  margin: 0 0 14px;
  font-size: 12px;
  line-height: 1.5;
  color: var(--muted);
  text-align: center;
}

.server-section {
  margin-bottom: 18px;
  padding: 14px;
  border: 1px solid rgba(66, 133, 244, 0.25);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.65);
}

.server-status {
  margin: 10px 0 0;
  font-size: 12px;
  text-align: center;
}

.server-status.ok { color: #137333; }
.server-status.bad { color: #c5221f; }

.code-action {
  width: 100%;
  margin-bottom: 10px;
  padding: 11px 16px;
}

.link-btn {
  display: block;
  width: 100%;
  margin-top: 10px;
  background: none;
  border: none;
  color: var(--blue);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
}

.link-btn:hover { text-decoration: underline; }

#roomCode strong {
  letter-spacing: 0.08em;
  color: var(--name-blue);
}

.overlay-sub strong {
  letter-spacing: 0.06em;
  color: var(--name-blue);
}

/* ---------- Room shell ---------- */
body.room { overflow: hidden; }

#roomApp {
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100vh;
  background:
    radial-gradient(circle at 90% 0%, rgba(26, 115, 232, 0.14), transparent 40%),
    linear-gradient(165deg, #ffffff 0%, #edf3ff 55%, #d6e6ff 100%);
}

#roomHeader {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 20px;
  background: rgba(255, 255, 255, 0.88);
  border-bottom: 1px solid var(--border);
  font-size: 13px;
  z-index: 4;
  backdrop-filter: blur(10px);
}

.header-left,
.header-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.meeting-badge {
  color: var(--green);
  font-weight: 600;
  font-size: 12px;
}

.secure-badge {
  background: rgba(24, 128, 56, 0.12);
  color: var(--green);
  border: 1px solid rgba(24, 128, 56, 0.25);
  font-size: 11px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 999px;
}

.user-name-badge {
  background: linear-gradient(135deg, #1a73e8, #4285f4);
  color: white;
  font-weight: 600;
  font-size: 12px;
  padding: 5px 12px;
  border-radius: 999px;
  box-shadow: 0 2px 8px rgba(26, 115, 232, 0.25);
}

.header-btn {
  background: white;
  border: 1px solid var(--border);
  color: var(--name-blue);
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 12px;
  cursor: pointer;
  font-weight: 600;
}

.header-btn:hover {
  background: var(--blue-soft);
  border-color: var(--blue);
}

#participantCount { color: var(--muted); }

/* ---------- Video grid ---------- */
.video-grid {
  flex: 1;
  display: grid;
  gap: 12px;
  padding: 16px;
  overflow: hidden;
  background: transparent;
}

.video-grid.solo {
  grid-template-columns: 1fr;
  grid-template-rows: 1fr;
  place-items: center;
}

.video-grid.solo .tile {
  width: min(100%, 960px);
  height: min(100%, calc(100vh - 160px));
  aspect-ratio: auto;
}

.video-grid.duo {
  grid-template-columns: repeat(2, 1fr);
  grid-template-rows: 1fr;
}

.video-grid.trio {
  grid-template-columns: repeat(2, 1fr);
  grid-template-rows: repeat(2, 1fr);
}

.video-grid.trio .tile:first-child {
  grid-column: 1 / -1;
}

.video-grid.quad {
  grid-template-columns: repeat(2, 1fr);
  grid-template-rows: repeat(2, 1fr);
}

.video-grid.many {
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  grid-auto-rows: minmax(160px, 1fr);
  overflow: auto;
}

.tile {
  position: relative;
  background: white;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--border);
  min-height: 0;
  aspect-ratio: 16 / 9;
  box-shadow: 0 8px 28px rgba(26, 115, 232, 0.1);
}

.tile.local-tile {
  box-shadow: 0 0 0 2px rgba(26, 115, 232, 0.45), 0 8px 28px rgba(26, 115, 232, 0.12);
}

.tile video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  background: #dbeafe;
  transform: scaleX(-1);
}

.tile.remote-tile video {
  transform: none;
}

.tile .avatar-wrap {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(180deg, #eef4ff, #d6e6ff);
  z-index: 1;
}

.tile .avatar {
  width: 88px;
  height: 88px;
  border-radius: 50%;
  background: linear-gradient(135deg, #1a73e8, #4285f4);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  font-weight: 600;
  box-shadow: 0 6px 20px rgba(26, 115, 232, 0.3);
}

.tile .label {
  position: absolute;
  left: 10px;
  bottom: 10px;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--border);
  padding: 4px 10px;
  border-radius: 999px;
  max-width: calc(100% - 20px);
  box-shadow: 0 2px 8px rgba(26, 115, 232, 0.1);
}

.tile .name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--name-blue);
  font-weight: 600;
}

.tile .muted-icon {
  font-size: 11px;
  opacity: 0.9;
}

/* ---------- Chat panel ---------- */
#chatPanel {
  position: fixed;
  right: 0;
  top: 48px;
  bottom: 88px;
  width: 320px;
  background: rgba(255, 255, 255, 0.96);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  z-index: 5;
  box-shadow: -8px 0 28px rgba(26, 115, 232, 0.1);
  backdrop-filter: blur(10px);
}

.chat-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
  font-weight: 600;
  color: var(--name-blue);
}

.chat-header button {
  background: none;
  border: none;
  color: var(--muted);
  cursor: pointer;
  font-size: 16px;
}

#chatMessages {
  flex: 1;
  overflow-y: auto;
  padding: 14px;
  font-size: 13px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.chat-msg .who {
  font-size: 11px;
  color: var(--name-blue);
  font-weight: 600;
  margin-bottom: 3px;
}

#chatInputRow {
  display: flex;
  gap: 8px;
  padding: 12px;
  border-top: 1px solid var(--border);
  background: var(--surface);
}

#chatInputRow input {
  flex: 1;
  background: white;
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 999px;
  padding: 10px 14px;
  font-size: 13px;
}

#chatInputRow input:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.12);
}

#chatInputRow button {
  background: var(--blue);
  border: none;
  color: white;
  padding: 0 16px;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 600;
}

/* ---------- Control bar ---------- */
#controlBar {
  position: relative;
  z-index: 6;
  padding: 0 16px 16px;
  margin-top: -4px;
}

.control-bar-inner {
  max-width: 760px;
  margin: 0 auto;
  background: rgba(255, 255, 255, 0.95);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 10px 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  box-shadow: 0 8px 28px rgba(26, 115, 232, 0.14);
  backdrop-filter: blur(10px);
}

.ctrl-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.ctrl {
  background: transparent;
  border: none;
  color: var(--text);
  min-width: 72px;
  padding: 8px 10px 6px;
  border-radius: 12px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.ctrl:hover { background: var(--blue-soft); }

.ctrl-icon {
  font-size: 18px;
  line-height: 1;
}

.ctrl-label {
  font-size: 11px;
  color: var(--muted);
  font-weight: 600;
}

.ctrl.off {
  background: var(--off);
}

.ctrl.off .ctrl-label { color: var(--off-text); }

.ctrl.active {
  background: rgba(24, 128, 56, 0.12);
}

.ctrl.active .ctrl-label { color: var(--green); }

.ctrl.leave {
  min-width: 88px;
  background: var(--red);
  border-radius: 999px;
  padding: 12px 18px;
}

.ctrl.leave .ctrl-label {
  color: white;
  font-size: 13px;
  font-weight: 600;
}

.ctrl.leave:hover { background: var(--red-hover); }

/* ---------- Join overlay ---------- */
.overlay {
  position: fixed;
  inset: 0;
  background: rgba(232, 241, 255, 0.75);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 20;
  backdrop-filter: blur(8px);
}

.overlay-card {
  background: rgba(255, 255, 255, 0.98);
  border: 1px solid var(--border);
  padding: 28px 24px;
  border-radius: 16px;
  width: min(380px, calc(100vw - 32px));
  text-align: center;
  box-shadow: 0 20px 60px rgba(26, 115, 232, 0.18);
}

.overlay-logo {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--name-blue);
  margin-bottom: 10px;
}

.overlay-card h3 {
  margin: 0 0 8px;
  font-size: 22px;
  font-weight: 600;
  color: var(--name-blue);
}

.overlay-sub {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

.overlay-card label,
.overlay-card .name-label {
  display: block;
  text-align: left;
  font-size: 12px;
  font-weight: 600;
  color: var(--name-blue);
  margin-bottom: 6px;
}

.overlay-card input {
  width: 100%;
  padding: 12px 14px;
  margin-bottom: 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: white;
  color: var(--text);
}

.overlay-card input:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.15);
}

#previewWrap {
  background: #dbeafe;
  border-radius: 12px;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  margin-bottom: 12px;
  border: 1px solid var(--border);
}

#previewVideo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transform: scaleX(-1);
}

#mediaStatus {
  font-size: 12px;
  color: var(--muted);
  min-height: 18px;
  margin: 0 0 12px;
  line-height: 1.4;
}

#mediaStatus.error { color: #c5221f; }

.permission-help {
  text-align: left;
  background: #fff8f7;
  border: 1px solid #f5c2c0;
  border-radius: 10px;
  padding: 12px 14px;
  margin: 0 0 12px;
  font-size: 12px;
  line-height: 1.55;
  color: var(--text);
}

.permission-help strong { color: #c5221f; }
.permission-help ol { margin: 8px 0 0; padding-left: 18px; }
.permission-help li { margin-bottom: 6px; }

.overlay-secondary {
  width: 100%;
  margin-top: 10px;
  padding: 11px 16px;
  border-radius: 999px;
  font-size: 13px;
}

.secure-warning {
  text-align: left;
  background: #fff8e1;
  border: 1px solid #f9dc7a;
  border-radius: 10px;
  padding: 10px 12px;
  margin-bottom: 12px;
  font-size: 12px;
  line-height: 1.5;
  color: #7a5c00;
}

@media (max-width: 720px) {
  .control-bar-inner {
    flex-wrap: wrap;
    gap: 10px;
  }

  .ctrl { min-width: 64px; }

  .user-name-badge {
    max-width: 120px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  #chatPanel {
    width: 100%;
    top: auto;
    bottom: 0;
    height: 50vh;
  }

  .video-grid.duo,
  .video-grid.trio,
  .video-grid.quad {
    grid-template-columns: 1fr;
    grid-template-rows: auto;
  }

  .video-grid.trio .tile:first-child {
    grid-column: auto;
  }
}