/* ═══════════════════════════════ DESIGN TOKENS */
:root {
  --bg:        #080c10;
  --bg-2:      #0d1219;
  --bg-3:      #131b25;
  --bg-4:      #1a2535;
  --surface:   #111820;
  --border:    rgba(255,255,255,.07);
  --border-hi: rgba(255,255,255,.14);

  --accent:    #00e5ff;
  --accent-2:  #7c4dff;
  --accent-glow: rgba(0,229,255,.18);
  --danger:    #ff4757;

  --txt:       #e8edf5;
  --txt-2:     #8a9ab5;
  --txt-3:     #4a5a72;

  --radius:    10px;
  --radius-lg: 18px;

  --font-ui:   'Syne', sans-serif;
  --font-mono: 'Space Mono', monospace;

  --transition: .18s cubic-bezier(.4,0,.2,1);
}

/* ═══════════════════════════════ RESET */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; overflow: hidden; }
body {
  background: var(--bg);
  color: var(--txt);
  font-family: var(--font-ui);
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input  { font-family: inherit; }

/* ═══════════════════════════════ SCREENS */
.screen {
  position: fixed; inset: 0;
  display: none;
  opacity: 0;
  transition: opacity .32s ease;
}
.screen.active {
  display: flex;
  opacity: 1;
}

/* ═══════════════════════════════ SPLASH */
#splash {
  flex-direction: column;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.splash-bg {
  position: absolute; inset: 0;
  pointer-events: none;
}
.grid-lines {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 20%, transparent 100%);
}
.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: .35;
}
.orb-1 {
  width: 560px; height: 560px;
  background: radial-gradient(circle, var(--accent-2) 0%, transparent 70%);
  top: -180px; right: -100px;
  animation: orbDrift 12s ease-in-out infinite alternate;
}
.orb-2 {
  width: 480px; height: 480px;
  background: radial-gradient(circle, var(--accent) 0%, transparent 70%);
  bottom: -160px; left: -120px;
  animation: orbDrift 9s ease-in-out infinite alternate-reverse;
}
@keyframes orbDrift {
  from { transform: translate(0,0) scale(1); }
  to   { transform: translate(40px, 30px) scale(1.08); }
}

.splash-content {
  position: relative; z-index: 1;
  display: flex; flex-direction: column;
  align-items: center; gap: 1rem;
  text-align: center;
  padding: 2rem;
}

.logo-mark {
  width: 64px; height: 64px;
  color: var(--accent);
  filter: drop-shadow(0 0 12px var(--accent-glow));
  animation: logoPulse 3s ease-in-out infinite;
}
@keyframes logoPulse {
  0%,100% { filter: drop-shadow(0 0 10px var(--accent-glow)); }
  50%      { filter: drop-shadow(0 0 24px rgba(0,229,255,.35)); }
}

.brand {
  font-size: clamp(2.4rem, 6vw, 3.6rem);
  font-weight: 800;
  letter-spacing: -.03em;
  background: linear-gradient(135deg, #fff 30%, var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.1;
}

.tagline {
  color: var(--txt-2);
  font-size: 1.05rem;
  max-width: 320px;
  line-height: 1.6;
  font-family: var(--font-mono);
  font-size: .88rem;
}

.splash-actions {
  display: flex; gap: .75rem; flex-wrap: wrap;
  justify-content: center;
  margin-top: .5rem;
}

.settings-trigger {
  position: absolute;
  top: 1.25rem; right: 1.25rem;
  width: 40px; height: 40px;
  border-radius: 50%;
  background: var(--bg-3);
  border: 1px solid var(--border);
  color: var(--txt-2);
  display: flex; align-items: center; justify-content: center;
  transition: var(--transition);
}
.settings-trigger svg { width: 18px; height: 18px; }
.settings-trigger:hover { color: var(--txt); border-color: var(--border-hi); }

/* ═══════════════════════════════ BUTTONS */
.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  padding: .7rem 1.5rem;
  border-radius: var(--radius);
  font-size: .92rem;
  font-weight: 700;
  letter-spacing: .02em;
  transition: var(--transition);
  cursor: pointer;
}
.btn-primary {
  background: var(--accent);
  color: #000;
  box-shadow: 0 0 0 0 var(--accent-glow);
}
.btn-primary:hover {
  background: #33ecff;
  box-shadow: 0 0 20px var(--accent-glow);
  transform: translateY(-1px);
}
.btn-ghost {
  background: transparent;
  border: 1px solid var(--border-hi);
  color: var(--txt);
}
.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.btn.sm { padding: .42rem .9rem; font-size: .82rem; }
.btn-icon { font-size: 1.1rem; }

.icon-btn {
  width: 38px; height: 38px;
  border-radius: var(--radius);
  background: var(--bg-3);
  border: 1px solid var(--border);
  color: var(--txt-2);
  display: flex; align-items: center; justify-content: center;
  transition: var(--transition);
  flex-shrink: 0;
}
.icon-btn svg { width: 18px; height: 18px; pointer-events: none; }
.icon-btn:hover { color: var(--txt); border-color: var(--border-hi); background: var(--bg-4); }
.icon-btn.sm { width: 30px; height: 30px; }
.icon-btn.sm svg { width: 14px; height: 14px; }
.icon-btn.danger:hover { color: var(--danger); border-color: var(--danger); }
.icon-btn.active { color: var(--accent); border-color: var(--accent); background: var(--accent-glow); }

/* ═══════════════════════════════ CALL SCREEN LAYOUT */
#callScreen {
  flex-direction: column;
  background: var(--bg);
}

/* TOPBAR */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: .6rem 1rem;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  height: 52px;
  z-index: 10;
}
.topbar-left, .topbar-right {
  display: flex; align-items: center; gap: .6rem;
}
.brand-small {
  font-weight: 800;
  font-size: 1rem;
  letter-spacing: -.02em;
  color: var(--accent);
}

/* CONNECTION STATUS */
.conn-status-wrap {
  display: flex; align-items: center; gap: .4rem;
  padding: .25rem .65rem;
  background: var(--bg-3);
  border-radius: 20px;
  border: 1px solid var(--border);
}
.conn-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--txt-3);
  transition: background .4s;
}
.conn-dot.connecting { background: #ffa500; animation: blink .8s ease-in-out infinite; }
.conn-dot.connected  { background: #00e676; box-shadow: 0 0 6px #00e676; animation: none; }
.conn-dot.failed     { background: var(--danger); animation: none; }
@keyframes blink { 0%,100%{opacity:1}50%{opacity:.3} }
.conn-label { font-size: .78rem; color: var(--txt-2); font-family: var(--font-mono); }

/* VIDEO GRID */
.video-grid {
  flex: 1;
  display: grid;
  gap: 6px;
  padding: 6px;
  overflow: hidden;
  grid-template-columns: 1fr;
  grid-template-rows: 1fr;
  background: var(--bg);
}
.video-grid.peers-1 { grid-template-columns: 1fr 1fr; }
.video-grid.peers-2 { grid-template-columns: 1fr 1fr; grid-template-rows: 1fr 1fr; }
.video-grid.peers-3 { grid-template-columns: 1fr 1fr; grid-template-rows: 1fr 1fr; }

/* VIDEO TILE */
.video-tile {
  position: relative;
  background: var(--bg-2);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: border-color .3s;
}
.video-tile.speaking { border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent-glow); }
.video-tile video {
  width: 100%; height: 100%;
  object-fit: cover;
  display: block;
  transform: scaleX(-1);
}
.video-tile.remote-tile video { transform: none; }

.tile-overlay {
  position: absolute; inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: .75rem;
  background: linear-gradient(to top, rgba(0,0,0,.65) 0%, transparent 40%, transparent 70%, rgba(0,0,0,.25) 100%);
  opacity: 0;
  transition: opacity .2s;
}
.video-tile:hover .tile-overlay { opacity: 1; }

.peer-info {
  display: flex; align-items: center; gap: .5rem;
  align-self: flex-end;
}
.peer-avatar {
  width: 28px; height: 28px;
  border-radius: 50%;
  background: var(--bg-4);
  border: 1px solid var(--border-hi);
  display: flex; align-items: center; justify-content: center;
  font-size: .8rem;
  overflow: hidden;
}
.peer-avatar img { width: 100%; height: 100%; object-fit: cover; border-radius: 50%; }
.peer-name {
  font-size: .82rem;
  color: #fff;
  font-weight: 600;
  text-shadow: 0 1px 4px rgba(0,0,0,.8);
}

.tile-controls {
  display: flex; gap: .4rem;
  align-self: flex-end;
}
.tile-btn {
  width: 34px; height: 34px;
  border-radius: 8px;
  background: rgba(0,0,0,.55);
  backdrop-filter: blur(6px);
  border: 1px solid rgba(255,255,255,.15);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  transition: var(--transition);
}
.tile-btn svg { width: 16px; height: 16px; }
.tile-btn:hover { background: rgba(255,255,255,.15); }
.tile-btn.muted  { color: var(--danger); border-color: var(--danger); }
.tile-btn.hidden-cam { color: var(--danger); border-color: var(--danger); }

/* No-cam placeholder */
.no-cam-placeholder {
  position: absolute; inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  background: var(--bg-3);
}
.no-cam-placeholder.visible { display: flex; }
.placeholder-avatar {
  width: 80px; height: 80px;
  border-radius: 50%;
  background: var(--bg-4);
  border: 2px solid var(--border-hi);
  display: flex; align-items: center; justify-content: center;
  font-size: 2rem;
  overflow: hidden;
}
.placeholder-avatar img { width: 100%; height: 100%; object-fit: cover; border-radius: 50%; }

/* Peer connection status overlay */
.peer-conn-status {
  position: absolute;
  top: .6rem; right: .6rem;
  font-size: .72rem;
  font-family: var(--font-mono);
  padding: .2rem .55rem;
  border-radius: 20px;
  background: rgba(0,0,0,.55);
  border: 1px solid var(--border);
  backdrop-filter: blur(4px);
  z-index: 2;
}

/* BOTTOM CALLBAR */
.callbar {
  display: flex; align-items: center; justify-content: center;
  gap: 1rem;
  padding: .5rem 1rem;
  background: var(--surface);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
  height: 60px;
}
.callbar-btn {
  display: flex; flex-direction: column; align-items: center; gap: 2px;
  padding: .3rem .8rem;
  border-radius: var(--radius);
  color: var(--txt-2);
  font-size: .7rem;
  font-weight: 600;
  letter-spacing: .04em;
  transition: var(--transition);
  position: relative;
}
.callbar-btn svg { width: 22px; height: 22px; }
.callbar-btn:hover { color: var(--txt); }
.callbar-btn.active { color: var(--accent); }
.badge {
  position: absolute;
  top: .1rem; right: .3rem;
  min-width: 16px; height: 16px;
  background: var(--danger);
  color: #fff;
  font-size: .65rem;
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  padding: 0 3px;
}
.badge.hidden { display: none; }

/* CHAT PANEL */
.chat-panel {
  position: fixed;
  right: 0; top: 52px; bottom: 60px;
  width: 320px;
  background: var(--surface);
  border-left: 1px solid var(--border);
  display: flex; flex-direction: column;
  transform: translateX(100%);
  transition: transform .25s cubic-bezier(.4,0,.2,1);
  z-index: 20;
}
.chat-panel.open { transform: translateX(0); }
.chat-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: .75rem 1rem;
  border-bottom: 1px solid var(--border);
  font-weight: 700;
  font-size: .9rem;
}
.chat-messages {
  flex: 1; overflow-y: auto;
  padding: .75rem;
  display: flex; flex-direction: column; gap: .6rem;
}
.chat-messages::-webkit-scrollbar { width: 4px; }
.chat-messages::-webkit-scrollbar-track { background: transparent; }
.chat-messages::-webkit-scrollbar-thumb { background: var(--bg-4); border-radius: 2px; }

.chat-msg {
  max-width: 90%;
  padding: .5rem .75rem;
  border-radius: var(--radius);
  font-size: .85rem;
  line-height: 1.45;
}
.chat-msg.me {
  align-self: flex-end;
  background: var(--accent-2);
  color: #fff;
  border-bottom-right-radius: 3px;
}
.chat-msg.them {
  align-self: flex-start;
  background: var(--bg-3);
  color: var(--txt);
  border-bottom-left-radius: 3px;
}
.chat-msg.system {
  align-self: center;
  background: transparent;
  color: var(--txt-3);
  font-size: .75rem;
  font-family: var(--font-mono);
  border: 1px solid var(--border);
}
.chat-msg-name {
  font-size: .72rem;
  color: var(--txt-2);
  margin-bottom: .2rem;
  font-weight: 700;
}

.chat-input-row {
  display: flex; gap: .5rem;
  padding: .65rem .75rem;
  border-top: 1px solid var(--border);
}
.chat-input-row input {
  flex: 1;
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: .5rem .75rem;
  color: var(--txt);
  font-size: .88rem;
  outline: none;
  transition: border-color .15s;
}
.chat-input-row input:focus { border-color: var(--accent); }
.chat-input-row input::placeholder { color: var(--txt-3); }

/* ═══════════════════════════════ MODALS */
.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,.7);
  backdrop-filter: blur(6px);
  display: flex; align-items: center; justify-content: center;
  z-index: 100;
  opacity: 0;
  pointer-events: none;
  transition: opacity .22s;
  padding: 1rem;
}
.modal-overlay.open {
  opacity: 1;
  pointer-events: all;
}

.modal {
  background: var(--bg-2);
  border: 1px solid var(--border-hi);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 520px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 24px 80px rgba(0,0,0,.6);
  transform: scale(.94) translateY(12px);
  transition: transform .22s cubic-bezier(.4,0,.2,1);
}
.modal-overlay.open .modal {
  transform: scale(1) translateY(0);
}
.modal::-webkit-scrollbar { width: 4px; }
.modal::-webkit-scrollbar-thumb { background: var(--bg-4); border-radius: 2px; }

.modal-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 1.2rem 1.4rem .8rem;
  border-bottom: 1px solid var(--border);
}
.modal-header h2 {
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: -.02em;
}

.modal-body {
  padding: 1.4rem;
  display: flex; flex-direction: column; gap: .5rem;
}

/* Signaling step UI */
.step-label {
  font-size: .78rem;
  font-family: var(--font-mono);
  color: var(--accent);
  letter-spacing: .08em;
  text-transform: uppercase;
  margin-bottom: .25rem;
  margin-top: .75rem;
}
.step-label:first-child { margin-top: 0; }
.step-desc {
  font-size: .85rem;
  color: var(--txt-2);
  margin-bottom: .5rem;
  line-height: 1.55;
}
.sig-box {
  width: 100%;
  min-height: 90px;
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--txt);
  padding: .65rem .85rem;
  font-family: var(--font-mono);
  font-size: .75rem;
  resize: vertical;
  outline: none;
  transition: border-color .15s;
  line-height: 1.4;
  word-break: break-all;
}
.sig-box:focus { border-color: var(--accent); }
.sig-box::placeholder { color: var(--txt-3); }

.link-box {
  display: flex; gap: .5rem; align-items: stretch;
}
.link-box input {
  flex: 1;
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: .55rem .85rem;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: .76rem;
  outline: none;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.divider {
  text-align: center;
  position: relative;
  margin: .5rem 0;
}
.divider::before {
  content: '';
  position: absolute; top: 50%; left: 0; right: 0;
  height: 1px;
  background: var(--border);
}
.divider span {
  position: relative;
  background: var(--bg-2);
  padding: 0 .75rem;
  color: var(--txt-3);
  font-size: .75rem;
  font-family: var(--font-mono);
}

.btn-row {
  display: flex; gap: .6rem; flex-wrap: wrap;
  margin-top: .25rem;
}

/* SETTINGS */
.field-label {
  font-size: .8rem;
  font-weight: 700;
  color: var(--txt-2);
  letter-spacing: .04em;
  text-transform: uppercase;
}
.text-input {
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: .6rem .85rem;
  color: var(--txt);
  font-size: .92rem;
  font-family: inherit;
  outline: none;
  transition: border-color .15s;
  width: 100%;
}
.text-input:focus { border-color: var(--accent); }
.text-input::placeholder { color: var(--txt-3); }

.avatar-picker {
  display: flex; align-items: center; gap: 1rem;
  margin-top: .4rem;
}
.avatar-preview {
  width: 64px; height: 64px;
  border-radius: 50%;
  background: var(--bg-3);
  border: 2px solid var(--border-hi);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.6rem;
  overflow: hidden;
  flex-shrink: 0;
}
.avatar-preview img { width: 100%; height: 100%; object-fit: cover; border-radius: 50%; }
.avatar-actions { display: flex; flex-direction: column; gap: .4rem; }

/* ═══════════════════════════════ TOAST */
.toast-container {
  position: fixed;
  bottom: 4.5rem; left: 50%;
  transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: .4rem;
  z-index: 9999;
  pointer-events: none;
}
.toast {
  background: var(--bg-4);
  border: 1px solid var(--border-hi);
  color: var(--txt);
  padding: .55rem 1.1rem;
  border-radius: 20px;
  font-size: .82rem;
  font-family: var(--font-mono);
  backdrop-filter: blur(10px);
  animation: toastIn .22s ease, toastOut .3s ease 2.7s forwards;
}
.toast.success { border-color: #00e676; color: #00e676; }
.toast.error   { border-color: var(--danger); color: var(--danger); }
@keyframes toastIn  { from { opacity:0; transform:translateY(8px); } to { opacity:1; transform:translateY(0); } }
@keyframes toastOut { from { opacity:1; } to { opacity:0; } }

/* ═══════════════════════════════ SCROLLBARS */
* { scrollbar-width: thin; scrollbar-color: var(--bg-4) transparent; }

/* ═══════════════════════════════ RESPONSIVE */
@media (max-width: 600px) {
  .video-grid.peers-1 { grid-template-columns: 1fr; grid-template-rows: 1fr 1fr; }
  .video-grid.peers-2 { grid-template-columns: 1fr; grid-template-rows: repeat(3, 1fr); }
  .video-grid.peers-3 { grid-template-columns: 1fr; grid-template-rows: repeat(4, 1fr); }
  .chat-panel { width: 100%; }
  .modal { max-width: 100%; }
}