:root {
  --bg: #0a0a0f;
  --bg2: #12121a;
  --surface: rgba(255, 255, 255, 0.05);
  --surface-hover: rgba(255, 255, 255, 0.08);
  --border: rgba(255, 255, 255, 0.08);
  --accent: #6c63ff;
  --accent2: #a78bfa;
  --accent-glow: rgba(108, 99, 255, 0.35);
  --success: #22d3a5;
  --danger: #f87171;
  --text: #f0f0f8;
  --text-muted: #8b8ba8;
  --radius: 16px;
  --radius-sm: 10px;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', 'Segoe UI', system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}

/* ── LOGIN PAGE ─────────────────────────────────────────────── */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    radial-gradient(ellipse 80% 60% at 50% -10%, rgba(108,99,255,0.18) 0%, transparent 70%),
    radial-gradient(ellipse 60% 40% at 80% 100%, rgba(167,139,250,0.1) 0%, transparent 60%),
    var(--bg);
  padding: 24px;
}

.login-card {
  width: 100%;
  max-width: 420px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 48px 40px;
  box-shadow:
    0 0 0 1px rgba(108,99,255,0.1),
    0 32px 64px rgba(0,0,0,0.6),
    0 0 80px var(--accent-glow);
  animation: fadeUp 0.5s ease both;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 32px;
}

.logo-icon {
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  box-shadow: 0 4px 16px var(--accent-glow);
  flex-shrink: 0;
}

.logo-text h1 {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.3px;
  background: linear-gradient(135deg, var(--text) 40%, var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo-text p {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 2px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.form-group input {
  width: 100%;
  padding: 14px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 15px;
  font-family: inherit;
  outline: none;
  transition: var(--transition);
}

.form-group input:focus {
  border-color: var(--accent);
  background: var(--surface-hover);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-group input::placeholder {
  color: var(--text-muted);
}

.btn-primary {
  width: 100%;
  padding: 15px;
  background: linear-gradient(135deg, var(--accent), #8b5cf6);
  border: none;
  border-radius: var(--radius-sm);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  margin-top: 8px;
  letter-spacing: 0.2px;
}

.btn-primary::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0);
  transition: var(--transition);
}

.btn-primary:hover::after {
  background: rgba(255,255,255,0.1);
}

.btn-primary:active {
  transform: scale(0.98);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.error-msg {
  background: rgba(248,113,113,0.1);
  border: 1px solid rgba(248,113,113,0.25);
  color: var(--danger);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-size: 14px;
  margin-top: 16px;
  display: none;
  animation: fadeUp 0.3s ease;
}

.error-msg.show {
  display: block;
}

/* ── HOST GRID DASHBOARD (Phase 1) ────────────────────────── */
.host-grid-container {
  width: 100vw;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  display: flex;
  flex-direction: column;
}

.host-top-bar {
  height: 60px;
  background: rgba(18, 18, 26, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  position: sticky;
  top: 0;
  z-index: 100;
}

/* Empty state when no streams are active */
.grid-empty-state {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
}

.grid-empty-state .big-icon {
  font-size: 54px;
  margin-bottom: 8px;
}

.grid-empty-state h3 {
  font-size: 22px;
  font-weight: 700;
  color: var(--text);
}

/* 5-Column Responsive Stream Grid */
.stream-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  padding: 20px 24px 60px;
}

@media (min-width: 1400px) {
  .stream-grid {
    grid-template-columns: repeat(5, 1fr);
  }
}

/* Individual Stream Card (YouTube Style) */
.stream-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
  position: relative;
}

.stream-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(108, 99, 255, 0.2);
}

.stream-video-wrap {
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #000;
  position: relative;
  overflow: hidden;
}

.stream-video-wrap video {
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: #000;
}

.stream-live-badge {
  position: absolute;
  top: 10px;
  left: 10px;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(248, 113, 113, 0.3);
  padding: 3px 8px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 600;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 6px;
  z-index: 5;
}

/* Pin Button — Center of Video Card, Shown ONLY on HOVER */
.pin-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.85);
  background: rgba(108, 99, 255, 0.9);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: #fff;
  padding: 8px 18px;
  border-radius: 100px;
  font-size: 13px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  z-index: 20;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s ease;
  display: flex;
  align-items: center;
  gap: 6px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.6);
}

.stream-card:hover .pin-btn {
  opacity: 1;
  visibility: visible;
  pointer-events: auto !important;
  transform: translate(-50%, -50%) scale(1);
}

.pin-btn:hover {
  background: var(--accent);
  border-color: #fff;
  transform: translate(-50%, -50%) scale(1.08) !important;
}

/* Fullscreen Pinned Stream Stage — FULL 100% SCREEN ONLY */
.pinned-stage-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 9999;
  background: #000;
  display: none;
  flex-direction: column;
}

.pinned-stage-overlay.show {
  display: flex !important;
}

.pinned-header-controls {
  position: absolute;
  top: 20px;
  right: 24px;
  z-index: 10000;
  display: flex;
  align-items: center;
  gap: 12px;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.pinned-stage-overlay:hover .pinned-header-controls {
  opacity: 1;
}

.unpin-btn {
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.25);
  color: #fff;
  padding: 8px 18px;
  border-radius: 100px;
  font-size: 13px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: var(--transition);
}

.unpin-btn:hover {
  background: rgba(248, 113, 113, 0.35);
  border-color: var(--danger);
  color: var(--danger);
}

.pinned-video-container {
  width: 100vw;
  height: 100vh;
  background: #000;
  display: flex;
  align-items: center;
  justify-content: center;
}

.pinned-video-container video {
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: #000;
}
  align-items: center;
  gap: 6px;
  z-index: 5;
}

.stream-info-bar {
  padding: 12px 14px;
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg2);
}

.stream-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  flex-shrink: 0;
}

.stream-name {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}


/* Sidebar İç Nội dung (Header, Viewer List, Link Box) */
.sidebar-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sidebar-header h3 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  margin: 0;
  display: flex;
  align-items: center;
  gap: 8px;
}

.sidebar-header .viewer-count {
  background: rgba(108, 99, 255, 0.2);
  color: var(--accent2);
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 12px;
}

.viewer-list {
  flex: 1;
  overflow-y: auto;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.empty-viewers {
  text-align: center;
  color: var(--text-muted);
  font-size: 13px;
  padding: 30px 10px;
  line-height: 1.6;
}

.viewer-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.viewer-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  color: #fff;
}

.viewer-name {
  font-size: 13px;
  color: var(--text);
  font-weight: 500;
}

.link-box {
  padding: 16px;
  border-top: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.2);
}

.link-label {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 6px;
}

.link-value {
  font-size: 12px;
  color: var(--accent2);
  background: rgba(0, 0, 0, 0.4);
  padding: 8px 10px;
  border-radius: 6px;
  border: 1px solid var(--border);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  cursor: pointer;
  transition: var(--transition);
}

.link-value:hover {
  background: rgba(108, 99, 255, 0.15);
  border-color: var(--accent);
}


/* Host HUD — hiện khi hover */
.host-hud {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 50;
  padding: 20px 24px;
  background: linear-gradient(to top, rgba(0,0,0,0.75) 0%, transparent 100%);
  display: flex;
  align-items: flex-end;
  gap: 10px;
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}

.host-fullscreen:hover .host-hud:not(.hud--hidden) {
  opacity: 1;
  pointer-events: auto;
}

.host-hud.hud--hidden {
  opacity: 0 !important;
  pointer-events: none !important;
}

.hud-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 9px 18px;
  background: rgba(0,0,0,0.65);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 100px;
  color: rgba(255,255,255,0.9);
  font-size: 13px;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: var(--transition);
}

.hud-btn:hover {
  background: rgba(255,255,255,0.15);
  border-color: rgba(255,255,255,0.3);
}

.hud-btn-danger {
  border-color: rgba(248,113,113,0.3);
  color: var(--danger);
}

.hud-btn-danger:hover {
  background: rgba(248,113,113,0.2);
  border-color: rgba(248,113,113,0.5);
}

/* Toggle button — hiện cùng hover, vị trí góc trên phải */
.hud-toggle-btn {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 60;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.15);
  color: rgba(255,255,255,0.85);
  font-size: 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
  opacity: 0;
  transition: opacity 0.3s ease, background 0.2s ease;
  pointer-events: none;
}

.host-fullscreen:hover .hud-toggle-btn,
.viewer-page:hover .hud-toggle-btn {
  opacity: 1;
  pointer-events: auto;
}

.hud-toggle-btn:hover {
  background: rgba(255,255,255,0.18);
  border-color: rgba(255,255,255,0.3);
}

.hud-toggle-btn.hud-off {
  color: rgba(255,255,255,0.35);
}

.viewer-page {
  width: 100vw;
  height: 100vh;
  background: #000;
  overflow: hidden;
  position: relative;
}

.viewer-page video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: #000;
}

/* Name entry overlay */
.name-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(0,0,0,0.92);
  backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  transition: opacity 0.4s ease;
}

.name-overlay.hide {
  opacity: 0;
  pointer-events: none;
}

.name-card {
  width: 100%;
  max-width: 400px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px 36px;
  box-shadow: 0 32px 64px rgba(0,0,0,0.8), 0 0 60px var(--accent-glow);
  animation: fadeUp 0.5s ease both;
  text-align: center;
}

.name-card .room-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(108,99,255,0.15);
  border: 1px solid rgba(108,99,255,0.3);
  border-radius: 100px;
  padding: 6px 14px;
  font-size: 13px;
  color: var(--accent2);
  margin-bottom: 24px;
  font-weight: 500;
}

.name-card h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: -0.4px;
}

.name-card p {
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 28px;
  line-height: 1.5;
}

.name-card input {
  width: 100%;
  padding: 14px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 15px;
  font-family: inherit;
  outline: none;
  transition: var(--transition);
  text-align: center;
  margin-bottom: 16px;
}

.name-card input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.name-card input::placeholder {
  color: var(--text-muted);
}

/* Viewer HUD — hiện khi hover */
.viewer-hud {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 50;
  padding: 20px 24px;
  background: linear-gradient(to top, rgba(0,0,0,0.7) 0%, transparent 100%);
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}

.viewer-page:hover .viewer-hud:not(.hud--hidden) {
  opacity: 1;
}

.viewer-hud.hud--hidden {
  opacity: 0 !important;
}

.hud-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(0,0,0,0.65);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 100px;
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 500;
  color: rgba(255,255,255,0.85);
}

.hud-pill .dot {
  width: 6px;
  height: 6px;
}

/* Status overlays */
.status-overlay {
  position: fixed;
  inset: 0;
  z-index: 80;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  background: rgba(0,0,0,0.85);
  backdrop-filter: blur(8px);
  display: none;
}

.status-overlay.show {
  display: flex;
}

.status-overlay .status-icon {
  font-size: 56px;
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.status-overlay h3 {
  font-size: 22px;
  font-weight: 700;
}

.status-overlay p {
  font-size: 15px;
  color: var(--text-muted);
}

/* Spinner */
.spinner {
  width: 44px;
  height: 44px;
  border: 3px solid rgba(108,99,255,0.2);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* Toast notification */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: rgba(30,30,40,0.95);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 12px 24px;
  font-size: 14px;
  font-weight: 500;
  z-index: 999;
  transition: transform 0.35s cubic-bezier(0.34,1.56,0.64,1), opacity 0.35s ease;
  opacity: 0;
  white-space: nowrap;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* ── LOADING STATE ──────────────────────────────────────────── */
.loading-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  gap: 16px;
  background: var(--bg);
}

.loading-state p {
  color: var(--text-muted);
  font-size: 15px;
}