/* Huddle — Apple Aesthetic Design System */
:root {
  --canvas: #FFFFFF; --surface: #F5F5F7; --accent: #0071E3; --accent-hover: #0077ED;
  --ink: #1D1D1F; --ink-subtle: #86868B; --border: #D2D2D7;
  --danger: #FF3B30; --danger-hover: #FF453A; --success: #34C759; --warning: #FF9F0A;
  --glass-bg: rgba(255,255,255,0.72); --glass-blur: blur(20px);
  --space-1: 4px; --space-2: 8px; --space-3: 12px; --space-4: 16px;
  --space-5: 24px; --space-6: 32px; --space-7: 48px; --space-8: 64px;
  --font-system: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", system-ui, sans-serif;
  --text-xs: 12px; --text-sm: 14px; --text-base: 17px; --text-lg: 20px;
  --text-xl: 24px; --text-2xl: 32px; --text-3xl: clamp(28px, 4vw, 48px);
  --radius-sm: 8px; --radius-md: 12px; --radius-lg: 16px; --radius-full: 9999px;
  --ease: cubic-bezier(0.25, 0.1, 0.25, 1);
  --dur: 0.3s;
  --tr: all var(--dur) var(--ease);
}
@media (prefers-reduced-motion: reduce) { :root { --dur: 0.01ms; } }

/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; text-rendering: optimizeLegibility; }
body { font-family: var(--font-system); font-size: var(--text-base); line-height: 1.5; color: var(--ink); background: var(--canvas); min-height: 100dvh; overflow-x: hidden; }
button, input { font-family: inherit; font-size: inherit; border: none; outline: none; background: none; color: inherit; }
button { cursor: pointer; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: var(--radius-sm); }

/* View system */
.view { display: none; width: 100%; min-height: 100dvh; }
.view.active { display: flex; }

/* Login */
.login-view { align-items: center; justify-content: center; flex-direction: column; gap: var(--space-6); padding: var(--space-7); }
.login-title { font-size: var(--text-3xl); font-weight: 700; letter-spacing: -0.02em; text-align: center; }
.login-subtitle { font-size: var(--text-lg); color: var(--ink-subtle); text-align: center; margin-top: calc(-1 * var(--space-4)); }
.login-form { display: flex; flex-direction: column; gap: var(--space-4); width: 100%; max-width: 360px; }
.login-input { width: 100%; padding: var(--space-3) 0; font-size: var(--text-xl); font-weight: 500; text-align: center; border-bottom: 2px solid var(--border); transition: var(--tr); caret-color: var(--accent); }
.login-input::placeholder { color: var(--border); font-weight: 400; }
.login-input:focus { border-bottom-color: var(--accent); }
.login-error { color: var(--danger); font-size: var(--text-sm); text-align: center; min-height: 20px; }

/* Primary button */
.btn-primary { display: inline-flex; align-items: center; justify-content: center; padding: var(--space-3) var(--space-6); font-size: var(--text-base); font-weight: 600; color: var(--canvas); background: var(--accent); border-radius: var(--radius-full); transition: var(--tr); min-height: 48px; }
.btn-primary:hover { background: var(--accent-hover); transform: scale(1.02); }
.btn-primary:active { transform: scale(0.98); }
.btn-primary:disabled { opacity: 0.4; cursor: not-allowed; transform: none; }

/* Glass header */
.header { position: fixed; top: 0; left: 0; right: 0; z-index: 100; display: flex; align-items: center; justify-content: space-between; padding: var(--space-3) var(--space-5); background: var(--glass-bg); backdrop-filter: var(--glass-blur); -webkit-backdrop-filter: var(--glass-blur); border-bottom: 0.5px solid var(--border); min-height: 52px; }
.header-title { font-size: var(--text-base); font-weight: 600; letter-spacing: -0.01em; }
.header-user { font-size: var(--text-sm); color: var(--ink-subtle); }
.btn-text { font-size: var(--text-sm); font-weight: 500; color: var(--accent); padding: var(--space-2) var(--space-3); border-radius: var(--radius-md); transition: var(--tr); }
.btn-text:hover { background: rgba(0,113,227,0.08); }

/* Lobby */
.lobby-view { flex-direction: column; padding-top: 52px; }
.lobby-content { display: grid; grid-template-columns: 1fr; gap: var(--space-5); padding: var(--space-5); max-width: 1200px; margin: 0 auto; width: 100%; }
@media (min-width: 768px) {
  .lobby-content { grid-template-columns: 280px 1fr; gap: var(--space-6); padding: var(--space-7); }
}
.lobby-section { display: flex; flex-direction: column; gap: var(--space-4); }
.section-header { display: flex; align-items: center; justify-content: space-between; }
.section-title { font-size: var(--text-sm); font-weight: 600; color: var(--ink-subtle); text-transform: uppercase; letter-spacing: 0.06em; }
.user-list, .room-list { display: flex; flex-direction: column; gap: var(--space-2); }

/* User item */
.user-item { display: flex; align-items: center; gap: var(--space-3); padding: var(--space-3) var(--space-4); border-radius: var(--radius-md); background: var(--surface); }
.user-avatar { width: 32px; height: 32px; border-radius: var(--radius-full); background: var(--accent); color: var(--canvas); display: flex; align-items: center; justify-content: center; font-size: var(--text-sm); font-weight: 600; flex-shrink: 0; }
.user-info { display: flex; flex-direction: column; min-width: 0; }
.user-name { font-size: var(--text-sm); font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.user-status { font-size: var(--text-xs); color: var(--ink-subtle); }

/* Room card */
.room-card { display: flex; align-items: center; justify-content: space-between; padding: var(--space-4) var(--space-5); border-radius: var(--radius-lg); background: var(--surface); transition: var(--tr); cursor: pointer; }
.room-card:hover { background: #ECECEE; transform: translateY(-1px); }
.room-info { display: flex; flex-direction: column; gap: var(--space-1); }
.room-name { font-size: var(--text-base); font-weight: 600; }
.room-count { font-size: var(--text-sm); color: var(--ink-subtle); }
.btn-join { padding: var(--space-2) var(--space-4); font-size: var(--text-sm); font-weight: 500; color: var(--accent); border-radius: var(--radius-full); border: 1.5px solid var(--accent); transition: var(--tr); }
.btn-join:hover { background: var(--accent); color: var(--canvas); }
.btn-create-room { display: inline-flex; align-items: center; gap: var(--space-2); padding: var(--space-2) var(--space-4); font-size: var(--text-sm); font-weight: 500; color: var(--accent); border-radius: var(--radius-full); transition: var(--tr); }
.btn-create-room:hover { background: rgba(0,113,227,0.08); }
.empty-state { padding: var(--space-7) var(--space-5); text-align: center; color: var(--ink-subtle); font-size: var(--text-sm); }

/* Dialog */
.dialog-overlay { position: fixed; inset: 0; z-index: 200; display: none; align-items: center; justify-content: center; background: rgba(0,0,0,0.3); backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px); }
.dialog-overlay.active { display: flex; }
.dialog { background: var(--canvas); border-radius: var(--radius-lg); padding: var(--space-6); width: 90%; max-width: 400px; display: flex; flex-direction: column; gap: var(--space-4); box-shadow: 0 8px 32px rgba(0,0,0,0.12); }
.dialog-title { font-size: var(--text-lg); font-weight: 600; }
.dialog-input { width: 100%; padding: var(--space-3) var(--space-4); font-size: var(--text-base); border: 1.5px solid var(--border); border-radius: var(--radius-md); transition: var(--tr); }
.dialog-input:focus { border-color: var(--accent); }
.dialog-actions { display: flex; gap: var(--space-3); justify-content: flex-end; }
.btn-secondary { padding: var(--space-2) var(--space-4); font-size: var(--text-sm); font-weight: 500; color: var(--ink-subtle); border-radius: var(--radius-full); transition: var(--tr); }
.btn-secondary:hover { background: var(--surface); }
.btn-dialog-confirm { padding: var(--space-2) var(--space-5); font-size: var(--text-sm); font-weight: 600; color: var(--canvas); background: var(--accent); border-radius: var(--radius-full); transition: var(--tr); }
.btn-dialog-confirm:hover { background: var(--accent-hover); }

/* Room view */
.room-view { flex-direction: column; padding-top: 52px; height: 100dvh; }
.room-body { flex: 1; display: flex; overflow: hidden; min-height: 0; }
.video-grid { flex: 1; display: grid; gap: var(--space-4); padding: var(--space-4); align-content: center; }
.video-grid[data-count="1"] { grid-template-columns: 1fr; }
.video-grid[data-count="2"], .video-grid[data-count="3"], .video-grid[data-count="4"] { grid-template-columns: repeat(2, 1fr); }
.video-grid[data-count="5"], .video-grid[data-count="6"] { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 640px) {
  .video-grid[data-count="2"], .video-grid[data-count="3"] { grid-template-columns: 1fr; }
  .video-grid[data-count="4"], .video-grid[data-count="5"], .video-grid[data-count="6"] { grid-template-columns: repeat(2, 1fr); }
}

/* Video tile */
.video-tile { position: relative; border-radius: var(--radius-lg); overflow: hidden; background: var(--ink); aspect-ratio: 16/9; }
.video-tile video { width: 100%; height: 100%; object-fit: cover; display: block; }
.video-label { position: absolute; bottom: 0; left: 0; right: 0; display: flex; align-items: center; gap: var(--space-2); padding: var(--space-2) var(--space-3); background: linear-gradient(transparent, rgba(0,0,0,0.6)); color: var(--canvas); font-size: var(--text-sm); font-weight: 500; }

/* Status indicator */
.status-dot { width: 8px; height: 8px; border-radius: var(--radius-full); flex-shrink: 0; }
.status-dot.connected { background: var(--success); box-shadow: 0 0 6px var(--success); }
.status-dot.checking { background: var(--warning); box-shadow: 0 0 6px var(--warning); animation: pulse 1.5s ease-in-out infinite; }
.status-dot.failed { background: var(--danger); box-shadow: 0 0 6px var(--danger); }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.4; } }
.video-error { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; color: rgba(255,255,255,0.7); font-size: var(--text-sm); text-align: center; padding: var(--space-4); }

/* Local PiP */
.local-video-pip { position: fixed; bottom: 100px; right: var(--space-5); width: 180px; aspect-ratio: 16/9; border-radius: var(--radius-md); overflow: hidden; background: var(--ink); z-index: 50; box-shadow: 0 4px 16px rgba(0,0,0,0.2); transition: var(--tr); }
.local-video-pip:hover { transform: scale(1.05); }
.local-video-pip video { width: 100%; height: 100%; object-fit: cover; display: block; transform: scaleX(-1); }
@media (max-width: 640px) { .local-video-pip { width: 120px; bottom: 88px; right: var(--space-3); } }

/* Controls bar */
.controls-bar { display: flex; align-items: center; justify-content: center; gap: var(--space-5); padding: var(--space-4); background: var(--glass-bg); backdrop-filter: var(--glass-blur); -webkit-backdrop-filter: var(--glass-blur); border-top: 0.5px solid var(--border); }
.control-btn { position: relative; width: 48px; height: 48px; border-radius: var(--radius-full); display: flex; align-items: center; justify-content: center; background: var(--surface); transition: var(--tr); }
.control-btn:hover { background: #E8E8ED; transform: scale(1.05); }
.control-btn:active { transform: scale(0.95); }
.control-btn.muted,
.control-btn.leave { background: var(--danger); color: var(--canvas); }
.control-btn.muted:hover,
.control-btn.leave:hover { background: var(--danger-hover); }
.control-btn svg { width: 22px; height: 22px; stroke-width: 1.8; }

/* Toast */
.toast-container { position: fixed; top: var(--space-8); left: 50%; transform: translateX(-50%); z-index: 300; display: flex; flex-direction: column; gap: var(--space-2); }
.toast { padding: var(--space-3) var(--space-5); border-radius: var(--radius-full); background: var(--ink); color: var(--canvas); font-size: var(--text-sm); font-weight: 500; white-space: nowrap; opacity: 0; transform: translateY(-8px); animation: toastIn var(--dur) var(--ease) forwards; }
.toast.error { background: var(--danger); }
@keyframes toastIn { to { opacity: 1; transform: translateY(0); } }
@keyframes toastOut { to { opacity: 0; transform: translateY(-8px); } }

/* Chat panel */
.chat-panel {
  width: 0; flex-shrink: 0; display: flex; flex-direction: column;
  background: var(--canvas); border-left: 0.5px solid var(--border);
  overflow: hidden; opacity: 0; pointer-events: none;
  transition: width var(--dur) var(--ease), opacity var(--dur) var(--ease);
  position: relative; max-height: 100%;
}
.chat-panel.open { width: 320px; overflow: visible; opacity: 1; pointer-events: auto; }
.chat-panel-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: var(--space-3) var(--space-4); border-bottom: 0.5px solid var(--border);
  flex-shrink: 0;
}
.chat-panel-title { font-size: var(--text-sm); font-weight: 600; color: var(--ink-subtle); text-transform: uppercase; letter-spacing: 0.06em; }
.chat-close-btn { width: 28px; height: 28px; display: flex; align-items: center; justify-content: center; border-radius: var(--radius-sm); color: var(--ink-subtle); transition: var(--tr); }
.chat-close-btn:hover { background: var(--surface); color: var(--ink); }

/* Chat messages area */
.chat-messages {
  flex: 1; overflow-y: auto; padding: var(--space-3) var(--space-4);
  display: flex; flex-direction: column; gap: var(--space-2);
  scrollbar-width: thin; scrollbar-color: var(--border) transparent;
}
.chat-messages::-webkit-scrollbar { width: 4px; }
.chat-messages::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

/* Chat message bubbles */
.chat-msg { max-width: 85%; padding: var(--space-2) var(--space-3); border-radius: var(--radius-md); font-size: var(--text-sm); line-height: 1.45; word-break: break-word; animation: chatMsgIn 0.2s var(--ease); }
.chat-msg.self { align-self: flex-end; background: var(--accent); color: var(--canvas); border-bottom-right-radius: var(--space-1); }
.chat-msg.other { align-self: flex-start; background: var(--surface); color: var(--ink); border-bottom-left-radius: var(--space-1); }
.chat-msg-name { font-size: var(--text-xs); font-weight: 600; color: var(--accent); margin-bottom: 2px; display: block; }
.chat-msg-text { white-space: pre-wrap; }
.chat-msg-time { font-size: 10px; opacity: 0.6; margin-top: 2px; display: block; text-align: right; }
.chat-msg.other .chat-msg-time { text-align: left; }
@keyframes chatMsgIn { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: translateY(0); } }

/* Chat empty state */
.chat-empty { flex: 1; display: flex; align-items: center; justify-content: center; color: var(--ink-subtle); font-size: var(--text-sm); text-align: center; padding: var(--space-7); }

/* Chat input bar */
.chat-input-bar {
  display: flex; align-items: flex-end; gap: var(--space-2);
  padding: var(--space-3) var(--space-4); border-top: 0.5px solid var(--border);
  background: var(--canvas); flex-shrink: 0;
}
.chat-input {
  flex: 1; resize: none; border: 1.5px solid var(--border); border-radius: var(--radius-md);
  padding: var(--space-2) var(--space-3); font-size: var(--text-sm); line-height: 1.4;
  max-height: 80px; min-height: 36px; overflow-y: auto;
  transition: border-color var(--dur) var(--ease);
  font-family: var(--font-system); color: var(--ink); background: var(--surface);
}
.chat-input::placeholder { color: var(--ink-subtle); }
.chat-input:focus { border-color: var(--accent); background: var(--canvas); }
.chat-send-btn {
  width: 36px; height: 36px; flex-shrink: 0; display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-full); background: var(--accent); color: var(--canvas);
  transition: var(--tr);
}
.chat-send-btn:hover { background: var(--accent-hover); transform: scale(1.05); }
.chat-send-btn:active { transform: scale(0.95); }

/* Chat badge (unread count on toggle button) */
.chat-badge {
  position: absolute; top: -4px; right: -4px; min-width: 18px; height: 18px;
  border-radius: var(--radius-full); background: var(--danger); color: var(--canvas);
  font-size: 11px; font-weight: 700; display: flex; align-items: center; justify-content: center;
  padding: 0 4px; line-height: 1;
}
.control-btn.chat-active { background: var(--accent); color: var(--canvas); }
.control-btn.chat-active:hover { background: var(--accent-hover); }

/* RWD: mobile chat takes full width */
@media (max-width: 640px) {
  .chat-panel {
    position: absolute; top: 0; right: 0; bottom: 0; width: 100%;
    z-index: 60; border-left: none;
  }
  .room-body { position: relative; }
}

/* ── Room Users Panel (sidebar in room view) ────────────────────── */
.room-users-panel {
  width: 240px; flex-shrink: 0; display: flex; flex-direction: column;
  background: var(--canvas); border-right: 0.5px solid var(--border);
  overflow-y: auto;
}
.room-users-panel-header {
  padding: var(--space-3) var(--space-4); border-bottom: 0.5px solid var(--border);
}
.room-user-list { display: flex; flex-direction: column; gap: 0; padding: var(--space-2) 0; }

/* Room user item with call button */
.room-user-item {
  display: flex; align-items: center; gap: var(--space-3);
  padding: var(--space-2) var(--space-4); transition: background var(--dur) var(--ease);
}
.room-user-item:hover { background: var(--surface); }
.room-user-item .user-avatar { width: 28px; height: 28px; font-size: var(--text-xs); }
.room-user-item .user-name { flex: 1; font-size: var(--text-sm); font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* "On call" badge */
.on-call-badge {
  font-size: 10px; font-weight: 600; color: var(--success);
  padding: 2px 6px; border-radius: var(--radius-full); background: rgba(52,199,89,0.1);
  white-space: nowrap;
}

/* Call button on each user row */
.btn-call-user {
  width: 32px; height: 32px; flex-shrink: 0; display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-full); color: var(--success); background: rgba(52,199,89,0.1);
  transition: var(--tr);
}
.btn-call-user:hover { background: var(--success); color: var(--canvas); transform: scale(1.1); }
.btn-call-user:disabled { opacity: 0.3; cursor: not-allowed; transform: none; background: var(--surface); color: var(--ink-subtle); }
.btn-call-user svg { width: 16px; height: 16px; stroke-width: 2; }

/* Room main content area */
.room-main-content { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; min-width: 0; position: relative; }

/* Empty state when no call active */
.room-empty-state {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: var(--space-4); padding: var(--space-7); color: var(--ink-subtle); text-align: center;
}
.room-empty-icon { opacity: 0.3; }
.room-empty-text { font-size: var(--text-sm); max-width: 240px; line-height: 1.5; }

/* Video grid takes full space during call */
.room-main-content .video-grid { width: 100%; height: 100%; }

@media (max-width: 640px) {
  .room-users-panel { width: 180px; }
}

/* ── Call Dialog ─────────────────────────────────────────────────── */
.call-dialog { align-items: center; text-align: center; padding: var(--space-7) var(--space-6); }
.call-dialog-avatar {
  width: 72px; height: 72px; border-radius: var(--radius-full);
  background: var(--accent); color: var(--canvas);
  display: flex; align-items: center; justify-content: center;
  font-size: var(--text-2xl); font-weight: 700; margin-bottom: var(--space-3);
}
.call-dialog-title { font-size: var(--text-lg); font-weight: 600; }
.call-dialog-actions { display: flex; gap: var(--space-5); margin-top: var(--space-5); }

/* Call action buttons (accept video / accept audio / decline) */
.call-action-btn {
  display: flex; flex-direction: column; align-items: center; gap: var(--space-2);
  padding: var(--space-3); border-radius: var(--radius-md); transition: var(--tr);
  min-width: 72px;
}
.call-action-btn span { font-size: var(--text-xs); font-weight: 600; }
.call-action-btn.accept-video,
.call-action-btn.accept-audio,
.call-action-btn.decline { color: var(--canvas); }
.call-action-btn:hover { transform: scale(1.05); }
.call-action-btn.accept-video { background: var(--success); }
.call-action-btn.accept-video:hover { background: #2DB74E; }
.call-action-btn.accept-audio { background: var(--accent); }
.call-action-btn.accept-audio:hover { background: var(--accent-hover); }
.call-action-btn.decline { background: var(--danger); }
.call-action-btn.decline:hover { background: var(--danger-hover); }

/* Calling pulse animation */
.calling-pulse {
  animation: callingPulse 1.5s ease-in-out infinite;
}
@keyframes callingPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(0,113,227,0.4); }
  50% { box-shadow: 0 0 0 16px rgba(0,113,227,0); }
}

/* Audio-only avatar in video tile */
.video-tile-avatar {
  position: absolute; inset: 0; display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: var(--space-2);
  background: linear-gradient(135deg, #1D1D1F 0%, #2C2C2E 100%);
}
.video-tile-avatar .avatar-large {
  width: 80px; height: 80px; border-radius: var(--radius-full);
  background: var(--accent); color: var(--canvas);
  display: flex; align-items: center; justify-content: center;
  font-size: var(--text-2xl); font-weight: 700;
}
.video-tile-avatar .avatar-name {
  color: rgba(255,255,255,0.7); font-size: var(--text-sm); font-weight: 500;
}