/* ========================================
   🎨 CLASIFICADOR PERROS & GATOS
   Modern UI Stylesheet
   ======================================== */

/* ---- Google Fonts ---- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Fredoka+One&display=swap');

/* ---- CSS Custom Properties ---- */
:root {
  --primary: #6C63FF;
  --primary-dark: #5A52D5;
  --primary-light: #8B85FF;
  --secondary: #FF6B9D;
  --accent: #FFD166;
  --bg-gradient: linear-gradient(135deg, #0f0c29 0%, #302b63 50%, #24243e 100%);
  --card-bg: rgba(255, 255, 255, 0.08);
  --card-border: rgba(255, 255, 255, 0.12);
  --card-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  --text-primary: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.7);
  --text-muted: rgba(255, 255, 255, 0.4);
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-display: 'Fredoka One', cursive;
  --radius-sm: 12px;
  --radius-md: 20px;
  --radius-lg: 28px;
  --radius-xl: 36px;
  --transition: cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background: var(--bg-gradient);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ---- Animated Background Particles ---- */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(108, 99, 255, 0.15) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(255, 107, 157, 0.1) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 80%, rgba(255, 209, 102, 0.08) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
}

/* ---- Header ---- */
header {
  position: relative;
  z-index: 10;
  padding: 1rem 2rem;
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.logo-img {
  height: 48px;
  width: auto;
  filter: drop-shadow(0 2px 8px rgba(108, 99, 255, 0.4));
  transition: transform 0.3s var(--transition);
}

.logo-img:hover {
  transform: scale(1.05) rotate(-3deg);
}

.header-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 400;
  background: linear-gradient(135deg, #fff 30%, var(--primary-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 0.02em;
}

.header-back {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.6rem 1.2rem;
  border-radius: 100px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: all 0.3s var(--transition);
  cursor: pointer;
}

.header-back:hover {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-1px);
}

.header-back svg {
  width: 18px;
  height: 18px;
  transition: transform 0.3s var(--transition);
}

.header-back:hover svg {
  transform: translateX(-3px);
}

/* ---- Main Content ---- */
main {
  position: relative;
  z-index: 1;
  min-height: calc(100vh - 85px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1.5rem;
}

/* ---- Camera Card ---- */
.camera-card {
  background: var(--card-bg);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--card-shadow);
  padding: 2rem;
  max-width: 520px;
  width: 100%;
  text-align: center;
  animation: cardEntry 0.8s var(--transition) both;
}

@keyframes cardEntry {
  from {
    opacity: 0;
    transform: translateY(30px) scale(0.96);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* ---- Camera Frame ---- */
.camera-frame {
  position: relative;
  width: 100%;
  max-width: 400px;
  margin: 0 auto;
  aspect-ratio: 1 / 1;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: rgba(0, 0, 0, 0.4);
  border: 2px solid rgba(255, 255, 255, 0.15);
  box-shadow: inset 0 0 60px rgba(0, 0, 0, 0.3), 0 8px 32px rgba(0, 0, 0, 0.3);
}

.camera-frame video,
.camera-frame canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.camera-frame canvas {
  z-index: 2;
}

.camera-frame video {
  z-index: 1;
}

/* ---- Scanning Overlay ---- */
.scan-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 3;
  pointer-events: none;
  border-radius: var(--radius-md);
  overflow: hidden;
}

.scan-line {
  position: absolute;
  left: 5%;
  width: 90%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--primary-light), transparent);
  box-shadow: 0 0 20px var(--primary-light), 0 0 60px var(--primary);
  animation: scanLine 2.5s ease-in-out infinite;
  opacity: 0.6;
}

@keyframes scanLine {
  0%, 100% { top: 5%; opacity: 0.3; }
  50% { top: 95%; opacity: 0.8; }
}

/* Overlay activo (escaneando) — línea más brillante */
.scan-overlay.active .scan-line {
  opacity: 0.9;
  box-shadow: 0 0 30px var(--primary-light), 0 0 80px var(--primary);
  animation-duration: 1.8s;
}

.scan-overlay.active .corner-bracket {
  opacity: 1;
  border-color: var(--primary-light);
  box-shadow: 0 0 12px rgba(108, 99, 255, 0.5);
}

/* Overlay pausado — línea estática tenue */
.scan-overlay.paused .scan-line {
  animation: none;
  opacity: 0.15;
  top: 50%;
  box-shadow: none;
}

.scan-overlay.paused .corner-bracket {
  opacity: 0.35;
}

/* Corner brackets */
.corner-bracket {
  position: absolute;
  z-index: 4;
  width: 24px;
  height: 24px;
  border-color: var(--primary-light);
  border-style: solid;
  border-width: 0;
  opacity: 0.8;
}

.corner-bracket.tl { top: 12px; left: 12px; border-top-width: 3px; border-left-width: 3px; border-radius: 4px 0 0 0; }
.corner-bracket.tr { top: 12px; right: 12px; border-top-width: 3px; border-right-width: 3px; border-radius: 0 4px 0 0; }
.corner-bracket.bl { bottom: 12px; left: 12px; border-bottom-width: 3px; border-left-width: 3px; border-radius: 0 0 0 4px; }
.corner-bracket.br { bottom: 12px; right: 12px; border-bottom-width: 3px; border-right-width: 3px; border-radius: 0 0 4px 0; }

/* ---- Loading State ---- */
.loading-state {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 5;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(15, 12, 41, 0.9);
  backdrop-filter: blur(8px);
  border-radius: var(--radius-md);
  gap: 1.2rem;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loading-state.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.spinner-ring {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  border: 4px solid rgba(255, 255, 255, 0.1);
  border-top-color: var(--primary-light);
  animation: spin 0.9s linear infinite;
}

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

.loading-text {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.3px;
}

.loading-dots::after {
  content: '';
  animation: dots 1.5s steps(4, end) infinite;
}

@keyframes dots {
  0% { content: ''; }
  25% { content: '.'; }
  50% { content: '..'; }
  75% { content: '...'; }
  100% { content: ''; }
}

/* ---- Camera Controls ---- */
.camera-controls {
  margin-top: 1.5rem;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.btn-switch {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.75rem 1.6rem;
  border-radius: 100px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s var(--transition);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.btn-switch:hover {
  background: rgba(255, 255, 255, 0.14);
  border-color: rgba(255, 255, 255, 0.25);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(108, 99, 255, 0.25);
}

.btn-switch:active {
  transform: translateY(0px) scale(0.97);
}

.btn-switch svg {
  width: 20px;
  height: 20px;
  transition: transform 0.4s var(--transition);
}

.btn-switch:hover svg {
  transform: rotate(180deg);
}

/* ---- Scan / Pause Buttons ---- */
.btn-scan,
.btn-pause {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.6rem;
  border-radius: 100px;
  border: none;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s var(--transition);
}

.btn-scan {
  background: linear-gradient(135deg, #22c55e, #16a34a);
  color: #fff;
  box-shadow: 0 4px 16px rgba(34, 197, 94, 0.35);
}

.btn-scan:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(34, 197, 94, 0.45);
}

.btn-scan:active:not(:disabled) {
  transform: translateY(0px) scale(0.97);
}

.btn-pause {
  background: linear-gradient(135deg, #f59e0b, #d97706);
  color: #fff;
  box-shadow: 0 4px 16px rgba(245, 158, 11, 0.35);
}

.btn-pause:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(245, 158, 11, 0.45);
}

.btn-pause:active:not(:disabled) {
  transform: translateY(0px) scale(0.97);
}

.btn-scan:disabled,
.btn-pause:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.btn-scan svg,
.btn-pause svg {
  width: 20px;
  height: 20px;
}

/* ---- Result Display ---- */
.result-display {
  margin-top: 1.5rem;
  min-height: 80px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.result-emoji {
  font-size: 3.5rem;
  line-height: 1;
  display: block;
  animation: emojiBounce 0.6s var(--transition);
}

@keyframes emojiBounce {
  0% { transform: scale(0); opacity: 0; }
  50% { transform: scale(1.3); }
  100% { transform: scale(1); opacity: 1; }
}

.result-label {
  font-family: var(--font-display);
  font-size: 3rem;
  line-height: 1.1;
  margin-top: 0.25rem;
  animation: labelReveal 0.5s var(--transition) 0.15s both;
}

@keyframes labelReveal {
  from {
    opacity: 0;
    transform: translateY(10px) scale(0.9);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.result-label.cat {
  background: linear-gradient(135deg, #F093FB, #F5576C);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.result-label.dog {
  background: linear-gradient(135deg, #4FACFE, #00F2FE);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.result-confidence {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.3rem;
  font-weight: 500;
  letter-spacing: 0.5px;
  animation: labelReveal 0.5s var(--transition) 0.3s both;
}

.result-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 1rem;
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-top: 0.5rem;
  animation: labelReveal 0.5s var(--transition) 0.45s both;
}

.result-badge.live {
  background: rgba(108, 99, 255, 0.2);
  color: var(--primary-light);
  border: 1px solid rgba(108, 99, 255, 0.3);
}

.result-badge .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #4ade80;
  animation: pulse-dot 1.5s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

/* Waiting State */
.result-waiting {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 400;
}

/* ---- Animación de placeholder cuando no hay resultado ---- */
@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

.skeleton {
  background: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0.04) 25%,
    rgba(255, 255, 255, 0.1) 50%,
    rgba(255, 255, 255, 0.04) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s ease-in-out infinite;
  border-radius: 8px;
}

/* ---- Footer / Status Bar ---- */
.status-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  z-index: 10;
  padding: 0.8rem 2rem;
  background: rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.status-text {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 400;
  letter-spacing: 0.3px;
}

.status-text .highlight {
  color: var(--text-secondary);
  font-weight: 500;
}

/* ---- Responsive ---- */

/* Tablet */
@media (max-width: 768px) {
  header {
    padding: 0.75rem 1.25rem;
  }

  .header-title {
    font-size: 1.15rem;
  }

  .logo-img {
    height: 38px;
  }

  .header-back span {
    display: none;
  }

  .header-back {
    padding: 0.5rem;
    border-radius: 50%;
  }

  .camera-card {
    padding: 1.5rem;
    border-radius: var(--radius-lg);
  }

  .result-label {
    font-size: 2.4rem;
  }

  .result-emoji {
    font-size: 2.8rem;
  }

  .btn-scan,
  .btn-pause {
    padding: 0.65rem 1.3rem;
    font-size: 0.85rem;
  }

  .btn-scan svg,
  .btn-pause svg {
    width: 18px;
    height: 18px;
  }
}

/* Mobile */
@media (max-width: 480px) {
  main {
    padding: 1rem;
    min-height: calc(100vh - 72px);
  }

  header {
    padding: 0.6rem 1rem;
  }

  .header-title {
    font-size: 1rem;
  }

  .logo-img {
    height: 32px;
  }

  .camera-card {
    padding: 1.2rem;
    border-radius: var(--radius-md);
  }

  .camera-frame {
    border-radius: var(--radius-sm);
    border-width: 1.5px;
  }

  .result-label {
    font-size: 2rem;
  }

  .result-emoji {
    font-size: 2.4rem;
  }

  .btn-switch {
    padding: 0.6rem 1.2rem;
    font-size: 0.82rem;
  }

  .btn-switch svg {
    width: 18px;
    height: 18px;
  }

  .btn-scan,
  .btn-pause {
    padding: 0.55rem 1.1rem;
    font-size: 0.8rem;
  }

  .btn-scan svg,
  .btn-pause svg {
    width: 16px;
    height: 16px;
  }

  .camera-controls {
    gap: 0.5rem;
  }

  .status-bar {
    padding: 0.6rem 1rem;
  }
}

/* ---- Reduced Motion ---- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .scan-overlay.active .scan-line,
  .scan-overlay.paused .scan-line,
  .scan-line {
    display: none !important;
  }

  .loading-dots::after {
    content: '...';
    animation: none;
  }
}