/* ==========================================================================
   UniRepLKNet SER - Modern Minimalist & Rich UI Stylesheet
   ========================================================================== */

:root {
  /* Light Theme Palette */
  --bg-primary: #f8fafc;
  --bg-surface: #ffffff;
  --bg-elevated: #ffffff;
  --border-color: #e2e8f0;
  --border-focus: #6366f1;
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;

  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-light: #eef2ff;
  --primary-glow: rgba(79, 70, 229, 0.25);

  --accent-red: #ef4444;
  --accent-green: #10b981;
  --accent-blue: #3b82f6;
  --accent-amber: #f59e0b;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

body.dark-theme {
  --bg-primary: #090d16;
  --bg-surface: #111827;
  --bg-elevated: #1e293b;
  --border-color: #1f293d;
  --border-focus: #818cf8;

  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #64748b;

  --primary: #6366f1;
  --primary-hover: #818cf8;
  --primary-light: rgba(99, 102, 241, 0.15);
  --primary-glow: rgba(99, 102, 241, 0.35);

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 20px -3px rgba(0, 0, 0, 0.5);
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.font-mono {
  font-family: 'JetBrains Mono', monospace;
}

/* Navbar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  backdrop-filter: blur(12px);
  padding: 14px 24px;
}

.nav-container {
  max-width: 1200px;
  margin: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-badge {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, #4f46e5, #7c3aed);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.35);
}

.brand-title {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.brand-title .highlight {
  background: linear-gradient(135deg, #4f46e5, #ec4899);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-subtitle {
  font-size: 12px;
  color: var(--text-muted);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.chip-status {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  background: var(--primary-light);
  color: var(--primary);
  font-size: 13px;
  font-weight: 600;
  border: 1px solid var(--border-color);
}

.status-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-green);
  box-shadow: 0 0 8px var(--accent-green);
}

.chip-status.processing .status-indicator {
  background-color: var(--accent-amber);
  box-shadow: 0 0 8px var(--accent-amber);
  animation: pulse-ring 1.2s infinite;
}

.theme-toggle-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  width: 38px;
  height: 38px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  transition: var(--transition);
}

.theme-toggle-btn:hover {
  background: var(--border-color);
}

/* App Container */
.app-container {
  max-width: 1200px;
  margin: 24px auto;
  padding: 0 20px 40px;
}

/* Cards */
.card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-md);
}

/* Input Section */
.input-card {
  margin-bottom: 24px;
  overflow: hidden;
}

.tabs-nav {
  display: flex;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-primary);
  padding: 6px;
  gap: 6px;
}

.tab-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 18px;
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  transition: var(--transition);
}

.tab-btn:hover {
  color: var(--text-primary);
  background: rgba(0, 0, 0, 0.04);
}

body.dark-theme .tab-btn:hover {
  background: rgba(255, 255, 255, 0.04);
}

.tab-btn.active {
  background: var(--bg-surface);
  color: var(--primary);
  box-shadow: var(--shadow-sm);
}

.tab-pane {
  display: none;
  padding: 24px;
}

.tab-pane.active {
  display: block;
  animation: fadeIn 0.25s ease-in-out;
}

/* Microphone Recorder */
.mic-recorder-wrapper {
  display: flex;
  align-items: center;
  gap: 32px;
  padding: 10px 20px;
}

.record-button-box {
  position: relative;
}

.record-btn {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 2px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  position: relative;
  transition: var(--transition);
}

.record-circle {
  width: 28px;
  height: 28px;
  background: var(--accent-red);
  border-radius: 50%;
  transition: var(--transition);
}

.record-btn:hover {
  border-color: var(--accent-red);
  transform: scale(1.05);
}

.record-btn.recording .record-circle {
  border-radius: 6px;
  width: 22px;
  height: 22px;
}

.record-btn.recording::after {
  content: '';
  position: absolute;
  inset: -8px;
  border: 2px solid var(--accent-red);
  border-radius: 50%;
  animation: pulse-ring 1.5s cubic-bezier(0.215, 0.61, 0.355, 1) infinite;
}

@keyframes pulse-ring {
  0% { transform: scale(0.9); opacity: 1; }
  100% { transform: scale(1.3); opacity: 0; }
}

.record-info {
  flex: 1;
}

.record-timer {
  font-size: 26px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -1px;
}

.record-instruction {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 4px;
}

.mic-meter-wrapper {
  width: 100%;
  max-width: 380px;
  height: 6px;
  background: var(--border-color);
  border-radius: var(--radius-full);
  margin-top: 10px;
  overflow: hidden;
}

.mic-meter-fill {
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, var(--accent-green), var(--accent-red));
  border-radius: var(--radius-full);
  transition: width 0.05s linear;
}

/* Presets */
.preset-instruction {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.preset-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.preset-chip {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  transition: var(--transition);
}

.preset-chip:hover {
  border-color: var(--primary);
  background: var(--primary-light);
  transform: translateY(-2px);
}

.preset-chip.active {
  border-color: var(--primary);
  background: var(--primary);
  color: #ffffff;
  box-shadow: 0 4px 12px var(--primary-glow);
}

/* Upload Dropzone */
.dropzone {
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-md);
  padding: 36px 20px;
  text-align: center;
  cursor: pointer;
  position: relative;
  background: var(--bg-primary);
  transition: var(--transition);
}

.dropzone:hover, .dropzone.drag-over {
  border-color: var(--primary);
  background: var(--primary-light);
}

.file-input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.dropzone-icon {
  color: var(--primary);
  margin-bottom: 8px;
}

.dropzone-text {
  font-size: 14px;
  color: var(--text-primary);
}

.dropzone-text .link-text {
  color: var(--primary);
  text-decoration: underline;
}

.dropzone-note {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 4px;
}

/* Two-Column Grid */
.content-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

/* Waveform Card */
.waveform-card {
  padding: 24px;
  margin-bottom: 20px;
}

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

.card-heading {
  font-size: 15px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}

.audio-controls {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn-play {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 14px;
  transition: var(--transition);
}

.btn-play:not(:disabled):hover {
  background: var(--primary);
  color: #ffffff;
  transform: scale(1.08);
}

.btn-play:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.timer-tag {
  font-size: 12px;
  color: var(--text-muted);
}

.waveform-box {
  width: 100%;
  height: 230px;
  background: #f8fafc;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  position: relative;
  cursor: crosshair;
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

body.dark-theme .waveform-box {
  background: #0d131f;
  border-color: #1f293d;
}

#waveformCanvas {
  width: 100%;
  height: 100%;
  display: block;
}

.waveform-cursor {
  position: absolute;
  top: 8px;
  pointer-events: none;
  font-size: 11px;
  font-weight: 600;
  padding: 2px 7px;
  background: #ef4444;
  color: #ffffff;
  border-radius: 4px;
  transform: translateX(-50%);
  display: none;
  z-index: 10;
  box-shadow: 0 2px 5px rgba(239, 68, 68, 0.4);
}

.waveform-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--border-color);
  font-size: 12px;
  color: var(--text-muted);
}

.waveform-hint {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-secondary);
}

.waveform-stats {
  font-size: 12px;
  color: var(--primary);
  font-weight: 600;
}

.spec-overlay-loading {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.7);
  backdrop-filter: blur(2px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  color: #ffffff;
  font-size: 13px;
  z-index: 20;
}

.spinner {
  width: 26px;
  height: 26px;
  border: 3px solid rgba(255, 255, 255, 0.2);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* Result Card */
.result-card {
  padding: 32px 28px;
  border-left: 6px solid var(--primary);
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.emotion-header {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-bottom: 0;
}

.emotion-avatar {
  font-size: 46px;
  width: 76px;
  height: 76px;
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm);
}

.emotion-meta .sub-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  font-weight: 700;
}

.emotion-title {
  font-size: 24px;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin: 2px 0 6px;
}

.badge-row {
  display: flex;
  gap: 8px;
}

.confidence-tag {
  background: rgba(16, 185, 129, 0.15);
  color: #059669;
  font-size: 12px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: var(--radius-full);
}

.speed-tag {
  background: var(--primary-light);
  color: var(--primary);
  font-size: 12px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: var(--radius-full);
}

.emotion-description {
  font-size: 13.5px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Probabilities Card */
.prob-card {
  padding: 20px;
  margin-bottom: 20px;
}

.card-subheading {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.prob-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.prob-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.prob-item-header {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  font-weight: 600;
}

.prob-name {
  display: flex;
  align-items: center;
  gap: 6px;
}

.prob-bar-track {
  height: 8px;
  background: var(--bg-primary);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.prob-bar-fill {
  height: 100%;
  border-radius: var(--radius-full);
  transition: width 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.empty-state {
  text-align: center;
  padding: 24px;
  color: var(--text-muted);
  font-size: 13px;
}

/* Model Info Card */
.model-info-card {
  padding: 16px 20px;
}

.info-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.info-icon {
  font-size: 24px;
}

.info-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-primary);
}

.info-detail {
  font-size: 11px;
  color: var(--text-muted);
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ==========================================================================
   Responsive Design & Mobile-First Breakpoints
   ========================================================================== */

/* 1. Tablets & Small Laptops (<= 992px) */
@media (max-width: 992px) {
  .content-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .app-container {
    padding: 0 16px 36px;
    margin: 18px auto;
  }

  .result-card {
    min-height: auto;
  }
}

/* 2. Mobile Phones & Phablets (<= 640px) */
@media (max-width: 640px) {
  .navbar {
    padding: 10px 14px;
  }

  .nav-container {
    gap: 10px;
  }

  .nav-brand {
    gap: 10px;
  }

  .brand-badge {
    width: 38px;
    height: 38px;
    min-width: 38px;
    border-radius: var(--radius-sm);
  }

  .brand-badge svg {
    width: 20px;
    height: 20px;
  }

  .brand-title {
    font-size: 16px;
  }

  /* Hide long subtitle on mobile to avoid overcrowding the navbar */
  .brand-subtitle {
    display: none;
  }

  .nav-actions {
    gap: 8px;
  }

  .chip-status {
    padding: 4px 10px;
    font-size: 12px;
    gap: 6px;
  }

  .status-indicator {
    width: 7px;
    height: 7px;
  }

  .theme-toggle-btn {
    width: 34px;
    height: 34px;
    min-width: 34px;
    font-size: 14px;
  }

  .app-container {
    padding: 0 12px 24px;
    margin: 12px auto;
  }

  .card {
    border-radius: var(--radius-md);
  }

  .input-card {
    margin-bottom: 16px;
  }

  .tabs-nav {
    padding: 4px;
    gap: 4px;
  }

  .tab-btn {
    padding: 10px 8px;
    font-size: 13px;
    gap: 6px;
  }

  .tab-btn svg {
    width: 16px;
    height: 16px;
  }

  .tab-pane {
    padding: 16px 12px;
  }

  /* Stack recording controls vertically on mobile */
  .mic-recorder-wrapper {
    flex-direction: column;
    text-align: center;
    gap: 14px;
    padding: 8px 4px;
  }

  .record-btn {
    width: 64px;
    height: 64px;
  }

  .record-circle {
    width: 24px;
    height: 24px;
  }

  .record-timer {
    font-size: 24px;
  }

  .record-instruction {
    font-size: 12px;
    max-width: 280px;
    margin: 4px auto 0;
    text-align: center;
  }

  .mic-meter-wrapper {
    width: 100%;
    max-width: 260px;
    height: 5px;
    margin: 8px auto 0;
  }

  .record-info {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
  }

  .dropzone {
    padding: 24px 12px;
  }

  .dropzone-icon svg {
    width: 28px;
    height: 28px;
  }

  .dropzone-text {
    font-size: 13px;
  }

  .dropzone-note {
    font-size: 11px;
  }

  .waveform-card {
    padding: 16px 12px;
    margin-bottom: 16px;
  }

  .card-title-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    margin-bottom: 12px;
  }

  .card-heading {
    font-size: 14px;
  }

  .card-heading svg {
    width: 18px;
    height: 18px;
  }

  .audio-controls {
    width: 100%;
    justify-content: space-between;
  }

  .waveform-box {
    height: 180px;
  }

  .waveform-footer {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    font-size: 11px;
    padding-top: 10px;
    margin-top: 10px;
  }

  .waveform-hint {
    font-size: 11px;
  }

  .waveform-stats {
    font-size: 11px;
  }

  .result-card {
    padding: 20px 14px;
  }

  .emotion-header {
    gap: 12px;
  }

  .emotion-avatar {
    width: 58px;
    height: 58px;
    font-size: 32px;
    border-radius: var(--radius-md);
    min-width: 58px;
  }

  .emotion-title {
    font-size: 20px;
    line-height: 1.25;
  }

  .badge-row {
    flex-wrap: wrap;
    gap: 6px;
  }

  .speed-tag, .confidence-tag {
    font-size: 11px;
    padding: 2px 8px;
  }

  .prob-card {
    padding: 16px 14px;
    margin-bottom: 16px;
  }

  .card-subheading {
    font-size: 13px;
    margin-bottom: 12px;
  }
}

/* 3. Small Mobile Devices (<= 400px) */
@media (max-width: 400px) {
  .nav-container {
    gap: 6px;
  }

  .brand-title {
    font-size: 15px;
  }

  .chip-status {
    padding: 3px 8px;
    font-size: 11px;
  }

  .tab-btn {
    font-size: 12px;
    padding: 8px 4px;
  }

  .waveform-box {
    height: 160px;
  }

  .emotion-avatar {
    width: 48px;
    height: 48px;
    font-size: 26px;
    min-width: 48px;
  }

  .emotion-title {
    font-size: 18px;
  }
}

/* 4. Extra Narrow Screens (<= 360px) */
@media (max-width: 360px) {
  #statusText {
    display: none;
  }

  .chip-status {
    padding: 6px;
    border-radius: 50%;
    justify-content: center;
    width: 26px;
    height: 26px;
  }

  .status-indicator {
    margin: 0;
  }

  .tab-btn svg {
    display: none;
  }
}