:root {
  /* Palette */
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-glow: rgba(99, 102, 241, 0.4);

  --success: #10b981;
  --success-hover: #059669;

  --danger: #ef4444;
  --danger-hover: #dc2626;

  --warning: #f59e0b;

  --bg-dark: #0f172a;
  --bg-card: rgba(30, 41, 59, 0.7);
  --bg-card-border: rgba(255, 255, 255, 0.08);

  --text-main: #f8fafc;
  --text-muted: #94a3b8;

  --radius: 12px;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.15);
}

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

body {
  font-family: "Inter", sans-serif;
  background-color: var(--bg-dark);
  background-image: radial-gradient(at 0% 0%, rgba(99, 102, 241, 0.15) 0px, transparent 50%),
    radial-gradient(at 100% 0%, rgba(16, 185, 129, 0.1) 0px, transparent 50%);
  color: var(--text-main);
  min-height: 100vh;
  overflow-x: hidden;
}

/* Layout */
.app-container {
  display: grid;
  grid-template-columns: 350px 1fr;
  gap: 24px;
  max-width: 1400px;
  margin: 0 auto;
  padding: 24px;
  height: 100vh;
}

@media (max-width: 768px) {
  .app-container {
    grid-template-columns: 1fr;
    height: auto;
  }
}

/* Sidebar & Cards */
aside {
  display: flex;
  flex-direction: column;
  gap: 20px;
  overflow-y: auto;
  padding-right: 4px; /* for scrollbar */
}

.card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--bg-card-border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
  transition: transform 0.2s, border-color 0.2s;
}

.card:hover {
  border-color: rgba(255, 255, 255, 0.15);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.card-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Buttons & Inputs */
.btn {
  width: 100%;
  padding: 10px 16px;
  border: none;
  border-radius: 8px;
  font-family: inherit;
  font-weight: 500;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  color: white;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  filter: grayscale(0.5);
}

.btn-primary {
  background: var(--primary);
  box-shadow: 0 0 15px -5px var(--primary-glow);
}
.btn-primary:not(:disabled):hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 20px -5px var(--primary-glow);
}

.btn-success {
  background: var(--success);
}
.btn-success:not(:disabled):hover {
  background: var(--success-hover);
}

.btn-danger {
  background: var(--danger);
}
.btn-danger:not(:disabled):hover {
  background: var(--danger-hover);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--bg-card-border);
  color: var(--text-muted);
}
.btn-outline:hover {
  border-color: var(--text-muted);
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.02);
}

.btn-icon {
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: 50%;
}

.input-group {
  position: relative;
  margin-bottom: 12px;
}

.form-control {
  width: 100%;
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid var(--bg-card-border);
  border-radius: 8px;
  padding: 10px 12px;
  color: var(--text-main);
  font-family: inherit;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.2);
}

.presets {
  display: flex;
  gap: 8px;
  margin-top: 8px;
}

.preset-chip {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--bg-card-border);
  padding: 4px 10px;
  border-radius: 12px;
  font-size: 0.75rem;
  cursor: pointer;
  transition: all 0.2s;
  color: var(--text-muted);
}
.preset-chip:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-main);
  border-color: rgba(255, 255, 255, 0.2);
}

/* Status Indicators */
.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--bg-card-border);
}
.status-dot.connected {
  background: var(--success);
  box-shadow: 0 0 8px var(--success);
}
.status-dot.connecting {
  background: var(--warning);
  animation: pulse 1.5s infinite;
}
.status-dot.disconnected {
  background: var(--danger);
}

@keyframes pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

/* Steps Widget */
.steps-widget {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.step-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  background: rgba(0, 0, 0, 0.2);
  border-radius: 8px;
  border-left: 3px solid transparent;
}
.step-item.active {
  border-left-color: var(--warning);
  background: rgba(245, 158, 11, 0.1);
}
.step-item.done {
  border-left-color: var(--success);
  background: rgba(16, 185, 129, 0.05);
}

.step-icon {
  opacity: 0.5;
}
.step-item.done .step-icon {
  color: var(--success);
  opacity: 1;
}
.step-item.active .step-icon {
  color: var(--warning);
  opacity: 1;
}

/* Main Video Area */
.main-content {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.video-stage {
  flex: 1;
  background: #000;
  border-radius: var(--radius);
  overflow: hidden;
  position: relative;
  box-shadow: var(--shadow);
  border: 1px solid var(--bg-card-border);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 400px;
}

video#remoteVideo {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.local-pip {
  position: absolute;
  bottom: 20px;
  right: 20px;
  width: 200px;
  aspect-ratio: 16/9;
  background: #111;
  border-radius: 8px;
  border: 2px solid rgba(255, 255, 255, 0.1);
  overflow: hidden;
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.5);
  transition: all 0.3s;
}

.local-pip:hover {
  transform: scale(1.05);
  border-color: var(--primary);
}

video#localVideo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scaleX(-1); /* Mirror effect */
}

.video-overlay-stats {
  position: absolute;
  top: 20px;
  left: 20px;
  background: rgba(0, 0, 0, 0.7);
  padding: 12px;
  border-radius: 8px;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.9);
  pointer-events: none;
  backdrop-filter: blur(4px);
  max-width: 300px;
}

.overlay-controls {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 12px;
  background: rgba(0, 0, 0, 0.6);
  padding: 10px;
  border-radius: 30px;
  backdrop-filter: blur(8px);
}

.control-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: none;
  background: rgba(255, 255, 255, 0.1);
  color: white;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  transition: all 0.2s;
}
.control-btn:hover {
  background: rgba(255, 255, 255, 0.2);
}
.control-btn.active {
  background: var(--danger);
  color: white;
}
.control-btn.hangup {
  background: var(--danger);
}
.control-btn.hangup:hover {
  background: var(--danger-hover);
}

/* Logs */
.log-panel {
  background: #0d1117;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.8rem;
  padding: 12px;
  flex: 1;
  overflow-y: auto;
  border-radius: 8px;
  height: 250px;
  border: 1px solid var(--bg-card-border);
}

.log-entry {
  margin-bottom: 4px;
  line-height: 1.4;
  word-break: break-all;
}
.log-entry.info {
  color: #a5b4fc;
}
.log-entry.success {
  color: #34d399;
}
.log-entry.warning {
  color: #fbbf24;
}
.log-entry.error {
  color: #f87171;
}
.log-entry .time {
  color: #4b5563;
  margin-right: 8px;
  user-select: none;
}

/* Dialpad */
.dialpad-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-top: 16px;
}
.numpad-btn {
  background: rgba(255, 255, 255, 0.05);
  border: none;
  border-radius: 6px;
  padding: 12px;
  color: var(--text-main);
  font-size: 1.1rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.1s;
}
.numpad-btn:hover {
  background: rgba(255, 255, 255, 0.1);
}
.numpad-btn:active {
  transform: scale(0.98);
}

/* DTMF Flash Animation */
.numpad-btn.dtmf-flash {
  background: var(--primary);
  color: white;
  transform: scale(1.05);
  box-shadow: 0 0 12px var(--primary-glow);
}

@keyframes dtmfFlash {
  0% {
    background: var(--primary);
    transform: scale(1.05);
  }
  100% {
    background: rgba(255, 255, 255, 0.05);
    transform: scale(1);
  }
}

/* Incoming Call Modal */
@keyframes incomingPulse {
  0%,
  100% {
    transform: scale(1);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
  }
  50% {
    transform: scale(1.02);
    box-shadow: 0 20px 60px rgba(99, 102, 241, 0.3);
  }
}

.incoming-modal {
  display: none;
}
.incoming-modal.visible {
  display: flex !important;
}
.incoming-modal.hidden {
  display: none !important;
}

.incoming-modal-content {
  background: var(--bg-card);
  border-radius: 16px;
  padding: 32px;
  text-align: center;
  max-width: 400px;
  border: 1px solid var(--bg-card-border);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
  animation: incomingPulse 1.5s ease-in-out infinite;
}

.incoming-modal-icon {
  font-size: 4rem;
  margin-bottom: 16px;
}

.incoming-modal-title {
  color: var(--text-main);
  margin-bottom: 8px;
}

.incoming-modal-subtitle {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 8px;
}

.incoming-modal-caller {
  color: var(--primary);
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.incoming-modal-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
}

.incoming-modal-btn {
  border: none;
  border-radius: 50%;
  width: 64px;
  height: 64px;
  cursor: pointer;
  font-size: 1.5rem;
  color: white;
  transition: all 0.2s;
}

.incoming-modal-btn:hover {
  transform: scale(1.1);
}

.incoming-modal-btn.reject {
  background: var(--danger);
}

.incoming-modal-btn.accept {
  background: var(--success);
}