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

:root {
  --primary: #00f5ff;
  --accent: #4caf50;
  --alert: #ff4b4b;
  --bg-gradient1: #1e3c72;
  --bg-gradient2: #2a5298;
  --font-main: "Poppins", "Inter", "Segoe UI", Tahoma, Geneva, Verdana,
    sans-serif;
}

/* Futuristic Brain Tumor Detection Background */
body {
  margin: 0;
  padding: 0;
  font-family: "Poppins", sans-serif;
  background: linear-gradient(135deg, #071b2c, #102f4a, #0a1c34);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  text-align: center;
  padding: 20px;
}

/* Animated Gradient Overlay */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(
      circle at 20% 40%,
      rgba(0, 245, 255, 0.15),
      transparent 40%
    ),
    radial-gradient(circle at 80% 70%, rgba(255, 0, 245, 0.12), transparent 40%),
    radial-gradient(circle at 40% 80%, rgba(76, 175, 80, 0.15), transparent 40%);
  mix-blend-mode: screen;
  animation: bgShift 15s ease-in-out infinite alternate;
  z-index: -2;
}

@keyframes bgShift {
  0% {
    transform: scale(1) rotate(0deg);
  }
  50% {
    transform: scale(1.1) rotate(180deg);
  }
  100% {
    transform: scale(1) rotate(360deg);
  }
}

/* Particle Effect */
.particles {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: -1;
}

.particle {
  position: absolute;
  width: 3px;
  height: 3px;
  background: rgba(255, 255, 255, 0.6);
  border-radius: 50%;
  animation: particleMove 8s ease-in-out infinite;
}

@keyframes particleMove {
  0% {
    transform: translateY(0) translateX(0) scale(1);
    opacity: 1;
  }
  50% {
    transform: translateY(-50px) translateX(20px) scale(1.2);
    opacity: 0.6;
  }
  100% {
    transform: translateY(0) translateX(0) scale(1);
    opacity: 1;
  }
}

/* MRI-like Scan Lines */
body::after {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: repeating-linear-gradient(
    to bottom,
    rgba(255, 255, 255, 0.03),
    rgba(255, 255, 255, 0.03) 2px,
    transparent 2px,
    transparent 4px
  );
  opacity: 0.3;
  animation: scanLines 6s linear infinite;
  pointer-events: none;
  z-index: -1;
}

@keyframes scanLines {
  0% {
    transform: translateY(0);
  }
  100% {
    transform: translateY(4px);
  }
}

/* Header */
header {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(20px);
  padding: 20px 0;
  position: fixed;
  width: 100%;
  top: 0;
  z-index: 1000;
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.header-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 2.5rem;
  font-weight: bold;
  background: linear-gradient(45deg, var(--primary), #ff00f5);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 0 30px var(--primary);
  animation: glow 2s ease-in-out infinite alternate;
}

@keyframes glow {
  from {
    filter: brightness(1);
  }
  to {
    filter: brightness(1.3);
  }
}

.status-indicator {
  display: flex;
  align-items: center;
  gap: 10px;
  background: rgba(76, 175, 80, 0.3);
  padding: 10px 20px;
  border-radius: 25px;
  border: 1px solid rgba(76, 175, 80, 0.8);
}

.status-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 15px var(--accent);
  animation: pulse 1.5s infinite;
}

@keyframes pulse {
  0% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(1.2);
    opacity: 0.7;
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}

/* Main Content */
main {
  margin-top: 100px;
  padding: 40px 0;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.hero {
  text-align: center;
  padding: 60px 0;
  margin-bottom: 40px;
}

.hero h1 {
  font-size: 4rem;
  margin-bottom: 20px;
  text-shadow: 0 0 40px rgba(255, 255, 255, 0.5);
  animation: slideDown 1s ease-out;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-50px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero p {
  font-size: 1.4rem;
  margin-bottom: 30px;
  opacity: 0.9;
  animation: slideUp 1s ease-out 0.3s both;
}

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

/* Upload Section */
.upload-section {
  background: rgba(255, 255, 255, 0.13);
  backdrop-filter: blur(24px);
  border-radius: 30px;
  padding: 48px 40px 40px 40px;
  margin-bottom: 40px;
  border: 1.5px solid rgba(0, 245, 255, 0.18);
  box-shadow: 0 8px 40px 0 rgba(0, 245, 255, 0.1),
    0 1.5px 0 0 rgba(0, 245, 255, 0.4) inset;
  position: relative;
  overflow: visible;
  animation: fadeIn 1s ease-out 0.6s both;
}

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

.step-indicators {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  margin-bottom: 28px;
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  color: var(--primary);
  user-select: none;
}

.step {
  color: var(--primary);
  opacity: 0.7;
  transition: color 0.3s, opacity 0.3s;
}
.step.active {
  color: #fff;
  opacity: 1;
  text-shadow: 0 0 8px var(--primary);
}
.step-separator {
  color: var(--primary);
  opacity: 0.4;
  font-weight: 400;
}

.upload-area {
  border: 3px dashed rgba(0, 245, 255, 0.4);
  border-radius: 20px;
  padding: 60px 40px;
  text-align: center;
  transition: all 0.3s cubic-bezier(0.4, 2, 0.6, 1);
  cursor: pointer;
  position: relative;
  overflow: visible;
  background: linear-gradient(
    120deg,
    rgba(0, 245, 255, 0.04) 0%,
    rgba(255, 255, 255, 0.08) 100%
  );
  box-shadow: 0 0 30px 0 rgba(0, 245, 255, 0.08);
}

.upload-area:hover,
.upload-area.dragover {
  border-color: var(--primary);
  background: linear-gradient(
    120deg,
    rgba(0, 245, 255, 0.1) 0%,
    rgba(255, 255, 255, 0.13) 100%
  );
  box-shadow: 0 0 40px 0 rgba(0, 245, 255, 0.4);
  transform: translateY(-2px);
}

.upload-icon {
  font-size: 4rem;
  margin-bottom: 20px;
  color: var(--primary);
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%,
  20%,
  50%,
  80%,
  100% {
    transform: translateY(0);
  }
  40% {
    transform: translateY(-10px);
  }
  60% {
    transform: translateY(-5px);
  }
}

.upload-text {
  font-size: 1.6rem;
  margin-bottom: 15px;
  font-weight: 600;
}

.upload-subtext {
  font-size: 1.15rem;
  opacity: 0.8;
}

.file-input {
  display: none;
}

.upload-btn {
  background: linear-gradient(45deg, var(--primary), #ff00f5);
  color: white;
  border: none;
  padding: 15px 40px;
  border-radius: 30px;
  font-size: 1.25rem;
  font-weight: bold;
  cursor: pointer;
  margin-top: 20px;
  transition: all 0.3s ease;
  box-shadow: 0 5px 20px rgba(0, 245, 255, 0.3);
}

.upload-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(0, 245, 255, 0.5);
}

/* Image Preview */
.image-preview {
  display: none;
  margin-top: 30px;
  text-align: center;
}

.preview-container {
  position: relative;
  display: inline-block;
  border-radius: 15px;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.preview-image {
  max-width: 400px;
  max-height: 400px;
  border-radius: 15px;
  transition: transform 0.3s ease;
}

.preview-image:hover {
  transform: scale(1.05);
}

.remove-image {
  position: absolute;
  top: 10px;
  right: 10px;
  background: rgba(244, 67, 54, 0.8);
  color: white;
  border: none;
  border-radius: 50%;
  width: 30px;
  height: 30px;
  cursor: pointer;
  font-size: 1.2rem;
  transition: all 0.3s ease;
}

.remove-image:hover {
  background: #f44336;
  transform: scale(1.1);
}

/* Analysis Section */
.analysis-section {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(20px);
  border-radius: 30px;
  padding: 40px;
  margin-bottom: 40px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  display: none;
}

.analyze-btn {
  background: linear-gradient(45deg, var(--accent), #45a049);
  color: white;
  border: none;
  padding: 18px 50px;
  border-radius: 30px;
  font-size: 1.2rem;
  font-weight: bold;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 5px 20px rgba(76, 175, 80, 0.4);
  width: 100%;
  margin-bottom: 30px;
}

.analyze-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(76, 175, 80, 0.6);
}

.analyze-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* Loading Animation */
.loading {
  display: none;
  text-align: center;
  padding: 40px;
}

.loading-spinner {
  width: 60px;
  height: 60px;
  border: 4px solid rgba(255, 255, 255, 0.3);
  border-top: 4px solid var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto 20px;
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

.loading-text {
  font-size: 1.2rem;
  margin-bottom: 10px;
}

.loading-subtext {
  opacity: 0.7;
  font-size: 1rem;
}

/* Results Section */
.results {
  display: none;
  animation: slideIn 0.8s ease-out;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.result-card {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 20px;
  padding: 30px;
  margin-bottom: 20px;
  border-left: 5px solid;
}

.result-positive {
  border-left-color: var(--alert);
  background: rgba(255, 75, 75, 0.1);
}

.result-negative {
  border-left-color: var(--accent);
  background: rgba(76, 175, 80, 0.1);
}

.result-title {
  font-size: 1.8rem;
  font-weight: bold;
  margin-bottom: 15px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.result-confidence {
  font-size: 1.2rem;
  margin-bottom: 20px;
  opacity: 0.9;
}

.result-details {
  line-height: 1.6;
  font-size: 1.1rem;
}

/* Notification */
.notification {
  position: fixed;
  top: 120px;
  right: 20px;
  padding: 15px 25px;
  border-radius: 10px;
  color: white;
  font-weight: bold;
  opacity: 0;
  transform: translateX(100%);
  transition: all 0.3s ease;
  z-index: 1001;
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
}

.notification.success {
  background: linear-gradient(45deg, var(--accent), #45a049);
}

.notification.error {
  background: linear-gradient(45deg, var(--alert), #d32f2f);
}

.notification.show {
  opacity: 1;
  transform: translateX(0);
}

/* Disclaimer */
.disclaimer {
  background: rgba(255, 193, 7, 0.1);
  border: 1px solid rgba(255, 193, 7, 0.3);
  border-radius: 15px;
  padding: 20px;
  margin-top: 30px;
  text-align: center;
}

.disclaimer-title {
  font-size: 1.3rem;
  font-weight: bold;
  color: #ffc107;
  margin-bottom: 10px;
}

.disclaimer-text {
  font-size: 1rem;
  opacity: 0.9;
  line-height: 1.5;
}

/* Responsive Design */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.5rem;
  }

  .upload-section,
  .analysis-section {
    padding: 20px;
  }

  .preview-image {
    max-width: 300px;
    max-height: 300px;
  }
}

.hero-visuals {
  position: relative;
  width: 350px;
  height: 350px;
  margin: 0 auto 30px auto;
  display: flex;
  align-items: center;
  justify-content: center;
}

#brain-3d-container {
  width: 320px;
  height: 320px;
  background: transparent;
  border-radius: 50%;
  box-shadow: 0 0 40px 10px rgba(0, 245, 255, 0.08);
  overflow: hidden;
  z-index: 2;
}

.hero-brain-circle {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 320px;
  height: 320px;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background: rgba(30, 60, 114, 0.35);
  box-shadow: 0 0 60px 10px #00f5ff44, 0 0 0 8px rgba(0, 245, 255, 0.08) inset;
  border: 3px solid rgba(0, 245, 255, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2;
  overflow: hidden;
  backdrop-filter: blur(2px);
}

.hero-brain-img {
  width: 100%;
  height: 100%;
  max-width: none;
  max-height: none;
  object-fit: contain;
  object-position: center;
  opacity: 0.95;
  pointer-events: none;
  z-index: 2;
  filter: drop-shadow(0 0 18px #00f5ff55);
  position: relative;
  left: 0;
  top: 0;
  transform: none;
}

.scanner-line {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 10px;
  background: linear-gradient(90deg, transparent, #00f5ff 80%, transparent);
  opacity: 0.85;
  filter: blur(1px);
  z-index: 3;
  animation: scan-move 2.5s linear infinite;
}

@keyframes scan-move {
  0% {
    top: 0;
  }
  100% {
    top: 95%;
  }
}

.ai-analysis-visuals {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 32px;
  margin-bottom: 24px;
  min-height: 220px;
}

.ai-icon-ring {
  position: relative;
  width: 90px;
  height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ai-icon {
  font-size: 2.7rem;
  z-index: 2;
  color: var(--primary);
  text-shadow: 0 0 18px var(--primary) 99, 0 0 2px #fff;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}

.rotating-ring {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 80px;
  height: 80px;
  border-radius: 50%;
  border: 4px solid var(--primary) 44;
  border-top: 4px solid var(--primary);
  border-bottom: 4px solid var(--accent);
  transform: translate(-50%, -50%);
  animation: rotateRing 1.2s linear infinite;
  box-shadow: 0 0 18px 2px var(--primary) 88;
  z-index: 1;
}

@keyframes rotateRing {
  0% {
    transform: translate(-50%, -50%) rotate(0deg);
  }
  100% {
    transform: translate(-50%, -50%) rotate(360deg);
  }
}

.ai-heatmap {
  width: 120px;
  height: 60px;
  border-radius: 60px 60px 60px 60px / 60px 60px 60px 60px;
  background: linear-gradient(
    90deg,
    var(--primary) 0%,
    var(--accent) 50%,
    var(--alert) 100%
  );
  filter: blur(8px) brightness(1.2);
  opacity: 0.85;
  animation: heatmapMove 2.2s linear infinite alternate;
  box-shadow: 0 0 32px 8px var(--primary) 44, 0 0 18px 2px var(--alert) 44;
}

@keyframes heatmapMove {
  0% {
    background-position: 0% 50%;
  }
  100% {
    background-position: 100% 50%;
  }
}

.confidence-gauge {
  width: 90px;
  height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.confidence-gauge svg {
  width: 90px;
  height: 90px;
  transform: rotate(-90deg);
}

.confidence-gauge .gauge-text {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--primary);
  text-shadow: 0 0 8px var(--primary) 99;
}

/* Container */
.ui-container {
  max-width: 420px;
  width: 100%;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 16px;
  padding: 30px 20px;
  box-shadow: 0 4px 40px rgba(0, 245, 255, 0.2);
  backdrop-filter: blur(8px);
}

/* Logo */
.header .logo {
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 1.8rem;
  font-weight: bold;
  gap: 10px;
  margin-bottom: 20px;
}

.logo-icon {
  width: 40px;
  height: 40px;
}

/* Hero */
.hero h1 {
  font-size: 1.6rem;
  margin-bottom: 8px;
}

.hero p {
  font-size: 0.9rem;
  opacity: 0.8;
  margin-bottom: 20px;
}

/* Upload Box */
.upload-box {
  background: rgba(255, 255, 255, 0.08);
  padding: 20px;
  border-radius: 12px;
  border: 1px solid rgba(0, 245, 255, 0.2);
  margin-bottom: 20px;
}

.upload-icon {
  font-size: 2rem;
  color: #00f5ff;
  margin-bottom: 10px;
}

.upload-box h2 {
  font-size: 1.2rem;
  margin-bottom: 8px;
}

.upload-box p {
  font-size: 0.85rem;
  opacity: 0.7;
  margin-bottom: 12px;
}

.upload-btn {
  padding: 10px 20px;
  border: none;
  border-radius: 25px;
  font-size: 0.95rem;
  font-weight: bold;
  cursor: pointer;
  background: linear-gradient(45deg, #00f5ff, #0066ff);
  color: #fff;
  box-shadow: 0 4px 12px rgba(0, 245, 255, 0.4);
  transition: transform 0.2s;
}

.upload-btn:hover {
  transform: translateY(-2px);
}

/* Disclaimer */
.disclaimer {
  background: rgba(255, 193, 7, 0.1);
  border: 1px solid rgba(255, 193, 7, 0.3);
  border-radius: 10px;
  padding: 10px;
  font-size: 0.8rem;
  line-height: 1.4;
}

.disclaimer-title {
  font-weight: bold;
  color: #ffc107;
  margin-bottom: 5px;
}