@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  --bg-color: #f8fafc; /* Slate 50 */
  --bg-gradient: linear-gradient(135deg, #f1f5f9 0%, #f8fafc 100%);
  --text-primary: #0f172a; /* Slate 900 */
  --text-secondary: #475569; /* Slate 600 */
  
  --accent-primary: #2563eb; /* Corporate Blue 600 */
  --accent-secondary: #0d9488; /* Teal 600 */
  --accent-hover: #1d4ed8; /* Blue 700 */
  --accent-danger: #dc2626; /* Red 600 */
  
  --glass-bg: rgba(255, 255, 255, 0.85); /* Clean white panel */
  --glass-border: rgba(226, 232, 240, 0.8); /* Soft slate border */
  --glass-blur: blur(12px);
  --glass-shadow: 0 10px 15px -3px rgba(15, 23, 42, 0.05), 0 4px 6px -4px rgba(15, 23, 42, 0.05);

  --font-family: 'Inter', sans-serif;
}

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

body {
  background-color: var(--bg-color);
  background-image: var(--bg-gradient);
  color: var(--text-primary);
  font-family: var(--font-family);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.5;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  letter-spacing: -0.02em;
}

p {
  color: var(--text-secondary);
}

/* Utility Classes */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 6rem 2rem 2rem 2rem;
}

.glass-panel {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-radius: 1rem;
  box-shadow: var(--glass-shadow);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  color: #fff;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  font-weight: 500;
  cursor: pointer;
  transition: opacity 0.2s ease, transform 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
}

.btn-primary:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

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

.btn-secondary {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
}

.btn-secondary:hover {
  background: rgba(15, 23, 42, 0.05);
}

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

.btn-danger {
  background: var(--glass-bg);
  border: 1px solid var(--accent-danger);
  color: var(--accent-danger);
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
}

.btn-danger:hover {
  background: var(--accent-danger);
  color: #fff;
}

.text-gradient {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Animations */
@keyframes pulse-ring {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(139, 92, 246, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 10px rgba(139, 92, 246, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(139, 92, 246, 0); }
}

.animate-pulse-ring {
  animation: pulse-ring 2s infinite;
}

@keyframes fade-in-up {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.animate-fade-in-up {
  animation: fade-in-up 0.4s ease-out forwards;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: rgba(0, 0, 0, 0.1);
}
::-webkit-scrollbar-thumb {
  background: rgba(15, 23, 42, 0.2);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(15, 23, 42, 0.3);
}

.status-completed { background: rgba(20, 184, 166, 0.15); color: #0f766e; }
.status-in_progress { background: rgba(139, 92, 246, 0.15); color: #6d28d9; }
.text-secondary {
  color: var(--text-secondary);
}

/* Interview Room CSS */
.room-container {
  display: flex;
  flex-direction: column;
  height: 100vh;
  padding: 1rem;
  gap: 1rem;
  max-width: 1600px;
  margin: 0 auto;
}

.room-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
}

.header-info h2 {
  font-size: 1.25rem;
  color: var(--accent-secondary);
  margin-bottom: 0.25rem;
}

.question-badge {
  background: rgba(139, 92, 246, 0.2);
  color: var(--accent-primary);
  padding: 0.25rem 0.75rem;
  border-radius: 1rem;
  font-size: 0.875rem;
  font-weight: 600;
  display: inline-block;
}

.timer {
  font-size: 1.5rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.room-grid {
  display: grid;
  grid-template-columns: 320px 1fr 350px;
  gap: 1rem;
  flex: 1;
  min-height: 0;
}

.left-panel, .right-panel {
  padding: 1.5rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.left-panel h3, .right-panel h3 {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.question-text {
  font-size: 1.25rem;
  line-height: 1.6;
  font-weight: 500;
}

.center-panel {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #f8fafc;
  border: 1px solid var(--glass-border);
  border-radius: 0.75rem;
  overflow: hidden;
}

.ai-video-container {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.ai-avatar {
  width: 100%;
  height: 100%;
  border-radius: 0;
  overflow: hidden;
  border: none;
  background: transparent;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ai-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.active-speaking {
  border-color: var(--accent-primary);
}

.speaking-indicator {
  margin-top: 1.5rem;
  color: var(--accent-secondary);
  font-weight: 600;
}

.student-video-container {
  position: absolute;
  bottom: 1.5rem;
  right: 1.5rem;
  width: 200px;
  height: 150px;
  background: var(--bg-color);
  border: 2px solid var(--glass-border);
  border-radius: 0.75rem;
  overflow: hidden;
  box-shadow: 0 10px 25px rgba(15, 23, 42, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
}

.camera-placeholder {
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, #334155, #0f172a);
  display: flex;
  align-items: center;
  justify-content: center;
}

.camera-off {
  color: var(--accent-danger);
  font-weight: 600;
}

.transcript-box {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  overflow-y: auto;
  padding-right: 0.5rem;
}

.chat-bubble {
  padding: 1rem;
  border-radius: 0.5rem;
  background: rgba(15, 23, 42, 0.03);
  font-size: 0.95rem;
  line-height: 1.5;
  color: var(--text-primary);
}

.chat-bubble.ai {
  border-left: 3px solid var(--accent-secondary);
  background: rgba(20, 184, 166, 0.05);
}

.chat-bubble.admin {
  border-left: 3px solid var(--accent-danger);
  background: rgba(239, 68, 68, 0.05);
}

.chat-bubble.student {
  border-right: 3px solid var(--accent-primary);
  background: rgba(139, 92, 246, 0.05);
  text-align: right;
}

.recording-pulse {
  animation: pulse-bg 1.5s infinite;
}

@keyframes pulse-bg {
  0% { background: rgba(139, 92, 246, 0.05); }
  50% { background: rgba(139, 92, 246, 0.2); }
  100% { background: rgba(139, 92, 246, 0.05); }
}

.controls-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
}

.control-group {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.center-controls {
  flex: 1;
  justify-content: center;
}

.control-btn {
  background: rgba(15, 23, 42, 0.05);
  color: var(--text-primary);
  border: 1px solid var(--glass-border);
  padding: 0.75rem 1.25rem;
  border-radius: 2rem;
  cursor: pointer;
  font-weight: 500;
  transition: all 0.2s;
}

.control-btn:hover {
  background: rgba(15, 23, 42, 0.1);
}

.control-btn.danger {
  background: rgba(239, 68, 68, 0.15);
  color: var(--accent-danger);
  border-color: rgba(239, 68, 68, 0.2);
}

.answer-btn {
  padding: 1rem 2rem;
  border-radius: 3rem;
  font-size: 1.125rem;
  letter-spacing: 0.05em;
}

.answer-btn.recording {
  background: linear-gradient(135deg, #ef4444, #b91c1c);
  animation: pulse-ring 2s infinite;
}

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

/* High-contrast and readable styling inside light glass panels */
.glass-panel h1,
.glass-panel h2,
.glass-panel h3,
.glass-panel h4,
.glass-panel h5,
.glass-panel h6,
.glass-panel .question-text {
  color: var(--text-primary) !important;
}

.glass-panel p,
.glass-panel span.text-secondary,
.glass-panel p.text-secondary,
.glass-panel .text-secondary {
  color: var(--text-secondary) !important;
}

.glass-panel label {
  color: var(--text-primary) !important;
}

.glass-panel .input-field {
  background: #ffffff !important;
  color: var(--text-primary) !important;
  border: 1px solid rgba(226, 232, 240, 0.8) !important;
}

.glass-panel .input-field::placeholder {
  color: #94a3b8 !important;
}

.glass-panel select.input-field option {
  background-color: #ffffff !important;
  color: var(--text-primary) !important;
}

.glass-panel .chat-bubble {
  background: rgba(15, 23, 42, 0.02) !important;
  color: var(--text-primary) !important;
  border: 1px solid rgba(15, 23, 42, 0.05) !important;
}

.glass-panel .chat-bubble.ai {
  border-left: 3px solid var(--accent-secondary) !important;
  background: rgba(13, 148, 136, 0.06) !important;
}

.glass-panel .chat-bubble.student {
  border-right: 3px solid var(--accent-primary) !important;
  background: rgba(37, 99, 235, 0.06) !important;
}

.glass-panel .btn-secondary {
  background: #ffffff !important;
  border: 1px solid rgba(226, 232, 240, 0.8) !important;
  color: var(--text-primary) !important;
}

.glass-panel .btn-secondary:hover {
  background: rgba(15, 23, 42, 0.04) !important;
}

/* High-FPS Organic Lip Sync CSS Animation */
@keyframes lipSyncOrganic {
  0% { opacity: 0; }
  7% { opacity: 0.85; }
  14% { opacity: 0.15; }
  21% { opacity: 0.95; }
  28% { opacity: 0.05; }
  35% { opacity: 0.75; }
  42% { opacity: 0.2; }
  49% { opacity: 0.9; }
  56% { opacity: 0; }
  63% { opacity: 0.8; }
  70% { opacity: 0.1; }
  77% { opacity: 0.95; }
  84% { opacity: 0.25; }
  91% { opacity: 0.85; }
  100% { opacity: 0; }
}

.speaking-lip-sync {
  animation: lipSyncOrganic 1.8s infinite ease-in-out !important;
}

/* Floating Logo Styles */
.floating-logo {
  position: fixed;
  top: 1.25rem;
  left: 2rem;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  padding: 0.375rem;
  border-radius: 0.5rem;
  box-shadow: 0 4px 12px rgba(15, 23, 42, 0.05);
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.floating-logo img {
  height: 36px;
  border-radius: 0.25rem;
  display: block;
}

.floating-logo:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(15, 23, 42, 0.1);
  background: rgba(255, 255, 255, 0.9);
}

@media (max-width: 768px) {
  .floating-logo {
    top: 1rem;
    left: 1rem;
  }
}