/* YOUR ORIGINAL CSS STYLES (Keep everything as is) */

/* Main Stylesheet for ZeroML Platform */

/* ===== Variables ===== */

:root {
/* Colors */
--primary: #00c8ff;
--primary-dark: #0099ff;
--secondary: #9d4edd;
--accent: #ff00ff;
--background: #0a0e17;
--background-light: #141a29;
--card-bg: rgba(20, 26, 41, 0.7);
--text-primary: #ffffff;
--text-secondary: #a0a9c0;
--text-muted: #6c7a94;
--border-color: rgba(255, 255, 255, 0.1);
--success: #00e676;
--warning: #ffab00;
--error: #ff5252;
--info: #00b0ff;

/* Typography */
--font-primary: 'Inter', sans-serif;
--font-secondary: 'Poppins', sans-serif;

/* Shadows */
--shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
--shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
--shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.4);

/* Transitions */
--transition-fast: 0.2s ease;
--transition-normal: 0.3s ease;
--transition-slow: 0.5s ease;

/* Border Radius */
--radius-sm: 4px;
--radius-md: 8px;
--radius-lg: 16px;
--radius-xl: 24px;
--radius-full: 9999px;
}

/* ===== Base Styles ===== */
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}

html {
scroll-behavior: smooth;
}

body {
font-family: var(--font-primary);
background-color: var(--background);
color: var(--text-primary);
line-height: 1.6;
overflow-x: hidden;
background-image: radial-gradient(circle at 10% 20%, rgba(0, 200, 255, 0.1) 0%, transparent 20%),
radial-gradient(circle at 90% 80%, rgba(157, 78, 221, 0.1) 0%, transparent 20%);
background-attachment: fixed;
}

.app-container {
min-height: 100vh;
display: flex;
flex-direction: column;
}

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
font-family: var(--font-secondary);
font-weight: 600;
line-height: 1.3;
margin-bottom: 1rem;
}

h1 {
font-size: clamp(2.5rem, 8vw, 3.5rem);
letter-spacing: -0.5px;
}

h2 {
font-size: clamp(2rem, 6vw, 2.5rem);
letter-spacing: -0.3px;
}

h3 {
font-size: clamp(1.5rem, 4vw, 1.75rem);
}

h4 {
font-size: clamp(1.25rem, 3vw, 1.5rem);
}

p {
margin-bottom: 1rem;
font-size: clamp(0.9rem, 2.5vw, 1rem);
}

a {
color: var(--primary);
text-decoration: none;
transition: color var(--transition-fast);
}

a:hover {
color: var(--primary-dark);
}

.highlight {
background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
-webkit-background-clip: text;
background-clip: text;
color: transparent;
display: inline;
}

/* ===== Buttons ===== */
.btn {
display: inline-flex;
align-items: center;
justify-content: center;
padding: 0.75rem 1.5rem;
border-radius: var(--radius-md);
font-weight: 500;
font-size: 1rem;
cursor: pointer;
transition: all var(--transition-fast);
border: none;
outline: none;
position: relative;
overflow: hidden;
min-height: 48px;
min-width: 120px;
}

.btn::after {
content: '';
position: absolute;
width: 100%;
height: 100%;
top: 0;
left: 0;
pointer-events: none;
background-image: radial-gradient(circle, rgba(255, 255, 255, 0.3) 10%, transparent 10.01%);
background-repeat: no-repeat;
background-position: 50%;
transform: scale(10, 10);
opacity: 0;
transition: transform 0.5s, opacity 0.8s;
}

.btn:active::after {
transform: scale(0, 0);
opacity: 0.3;
transition: 0s;
}

.btn-primary {
background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
color: white;
box-shadow: 0 4px 14px rgba(0, 200, 255, 0.3);
}

.btn-primary:hover {
box-shadow: 0 6px 20px rgba(0, 200, 255, 0.4);
transform: translateY(-2px);
}

.btn-outline {
background: transparent;
color: var(--text-primary);
border: 2px solid rgba(255, 255, 255, 0.2);
box-shadow: none;
}

.btn-outline:hover {
border-color: var(--primary);
color: var(--primary);
transform: translateY(-2px);
}

.btn-lg {
padding: 1rem 2rem;
font-size: 1.1rem;
}

/* ===== Navbar ===== */
.navbar {
display: flex;
align-items: center;
justify-content: space-between;
padding: 1rem 2rem;
position: sticky;
top: 0;
left: 0;
right: 0;
z-index: 1000;
background: transparent !important;
overflow :hidden;
/* backdrop-filter: blur(10px);
-webkit-backdrop-filter: blur(10px); */
border-bottom: 1px solid var(--border-color);
transition: all var(--transition-normal);
}

.navbar .particles-container {
    position: absolute;
    top: 0; left: 0;
    width: 100%;
    height: 100%;
    z-index: 0; /* keep it behind nav content */
}

.navbar > *:not(.particles-container) {
    position: relative;
    z-index: 1; /* bring nav links/logo above particles */
}

.logo {
font-family: var(--font-secondary);
font-size: clamp(1.5rem, 4vw, 1.8rem);
font-weight: 700;
letter-spacing: -0.5px;
}


.navbar.scrolled {
padding: 0.75rem 2rem;
background: black;
}


.nav-links {
display: flex;
gap: 2rem;
}

.nav-link {
  background-color: transparent;
color: var(--text-primary);
font-weight: 500;
position: relative;
}

.nav-link::after {
content: '';
position: absolute;
bottom: -5px;
left: 0;
width: 0;
height: 2px;
background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
transition: width var(--transition-normal);
}

.nav-link:hover::after {
width: 100%;
}

.nav-actions {
display: flex;
align-items: center;
gap: 1rem;
}

.theme-toggle {
display: none !important;
}

.mobile-menu-btn {
display: none !important;
}

/* Particles Container - Global */
.particles-container {
position: fixed;
top: 0;
left: 0;
width: 100vw;
height: 100vh;
z-index: -1;
pointer-events: none;
}

/* Hero Section */
.hero {
position: relative;
display: flex;
align-items: center;
justify-content: space-between;
padding: 0% 5% 4rem;
min-height: 100vh;
overflow: hidden;
}

.hero-content {
flex: 1;
max-width: 800px;
z-index: 1;
text-align: center;
margin: 0 auto;
}

.hero-title {
font-size: clamp(2.5rem, 8vw, 4rem);
margin-bottom: 1.5rem;
line-height: 1.2;
text-align: center;
}

.hero-subtitle {
font-size: clamp(1rem, 3vw, 1.25rem);
color: var(--text-secondary);
margin-bottom: 2.5rem;
text-align: center;
max-width: 600px;
margin-left: auto;
margin-right: auto;
}

.hero-actions {
display: flex;
gap: 1rem;
justify-content: center;
flex-wrap: wrap;
}

/* ===== Features Section ===== */
.features {
padding: 6rem 2rem;
background-color: transparent;
}

.section-header {
text-align: center;
max-width: 800px;
margin: 0 auto 4rem;
}

.section-header p {
color: var(--text-secondary);
font-size: clamp(1rem, 3vw, 1.2rem);
}

.features-grid {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
gap: 2rem;
max-width: 1200px;
margin: 0 auto;
}

.feature-card {
background: var(--card-bg);
border-radius: var(--radius-lg);
padding: 2rem;
box-shadow: var(--shadow-md);
border: 1px solid var(--border-color);
transition: transform var(--transition-normal), box-shadow var(--transition-normal);
backdrop-filter: blur(10px);
-webkit-backdrop-filter: blur(10px);
}

.feature-card:hover {
transform: translateY(-10px);
box-shadow: var(--shadow-lg);
border-color: rgba(255, 255, 255, 0.2);
}

.feature-icon {
width: 60px;
height: 60px;
border-radius: var(--radius-full);
background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
display: flex;
align-items: center;
justify-content: center;
margin-bottom: 1.5rem;
font-size: 1.5rem;
color: white;
}

.feature-card h3 {
margin-bottom: 1rem;
}

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

/* ===== How It Works Section ===== */
.how-it-works {
padding: 6rem 2rem;
}

.steps-container {
max-width: 1000px;
margin: 0 auto;
}

.step {
display: flex;
align-items: center;
margin-bottom: 5rem;
position: relative;
}

.step:last-child {
margin-bottom: 0;
}

.step::after {
content: '';
position: absolute;
top: 100%;
left: 2.5rem;
width: 2px;
height: 5rem;
background: linear-gradient(to bottom, var(--primary), transparent);
display: none;
}

.step:last-child::after {
display: none;
}

.step-number {
width: 5rem;
height: 5rem;
border-radius: var(--radius-full);
background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
display: flex;
align-items: center;
justify-content: center;
font-size: 2rem;
font-weight: 700;
color: white;
flex-shrink: 0;
margin-right: 2rem;
box-shadow: 0 0 20px rgba(0, 200, 255, 0.4);
}

.step-content {
flex: 1;
}

.step-image {
max-width: 300px;
margin-left: 2rem;
}

.step-image img {
max-width: 100%;
height: auto;
border-radius: var(--radius-lg);
box-shadow: var(--shadow-md);
}

/* ===== Models Gallery Section ===== */
.models {
padding: 6rem 2rem;
background-color: transparent;
}

.models-grid {
display: grid;
grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
gap: 2rem;
max-width: 1200px;
margin: 0 auto;
}

.model-card {
background: var(--card-bg);
border-radius: var(--radius-lg);
padding: 2rem;
box-shadow: var(--shadow-md);
border: 1px solid var(--border-color);
transition: all var(--transition-normal);
backdrop-filter: blur(10px);
-webkit-backdrop-filter: blur(10px);
height: 100%;
display: flex;
flex-direction: column;
}

.model-card:hover {
transform: translateY(-10px) scale(1.02);
box-shadow: var(--shadow-lg);
border-color: rgba(0, 200, 255, 0.3);
}

.model-icon {
width: 50px;
height: 50px;
border-radius: var(--radius-md);
background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
display: flex;
align-items: center;
justify-content: center;
margin-bottom: 1.5rem;
font-size: 1.2rem;
color: white;
}

.model-card h3 {
margin-bottom: 0.5rem;
}

.model-card p {
color: var(--text-secondary);
margin-bottom: 1.5rem;
flex-grow: 1;
}

.model-tags {
display: flex;
flex-wrap: wrap;
gap: 0.5rem;
}

.tag {
padding: 0.3rem 0.8rem;
border-radius: var(--radius-full);
background-color: rgba(0, 200, 255, 0.15);
color: var(--primary);
font-size: 0.8rem;
font-weight: 500;
}

.tag-soon {
background-color: rgba(157, 78, 221, 0.15);
color: var(--secondary);
}

/* ===== Dashboard Preview Section ===== */
.dashboard-preview {
padding: 6rem 2rem;
}

.dashboard-container {
max-width: 1200px;
margin: 0 auto;
background: var(--card-bg);
border-radius: var(--radius-lg);
overflow: hidden;
border: 1px solid var(--border-color);
box-shadow: var(--shadow-lg);
backdrop-filter: blur(10px);
-webkit-backdrop-filter: blur(10px);
}

.dashboard-tabs {
display: flex;
border-bottom: 1px solid var(--border-color);
background-color: transparent;
}

.tab-btn {
    background-color: transparent; /* all inactive buttons stay transparent */
    color: var(--text-color);       /* normal text color */
    border: none;
    padding: 0.5rem 1rem;
    cursor: pointer;
    transition: background-color 0.3s ease, color 0.3s ease;
}



.tab-btn::after {
content: '';
position: absolute;
background: transparent;
bottom: 0;
left: 0;
width: 0;
height: 3px;
/* background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%); */
transition: width var(--transition-normal);
}

.tab-btn.active {
color: var(--text-primary);
background: transparent;
}

.tab-btn.active::after {
width: 100%;
background: transparent;
}

.dashboard-content {
padding: 2rem;
}

.tab-content {
display: none;
grid-template-columns: 1fr 1fr;
gap: 2rem;
}

.tab-content.active {
display: grid;
}

.dashboard-card {
background: rgba(10, 14, 23, 0.5);
border-radius: var(--radius-md);
padding: 1.5rem;
border: 1px solid var(--border-color);
}

.dashboard-card h3 {
margin-bottom: 1.5rem;
font-size: 1.3rem;
}

.data-preview img,
.heatmap-preview img,
.feature-selection-preview img,
.outlier-preview img,
.training-preview img,
.hyperparameter-preview img,
.metrics-preview img,
.predictions-preview img {
width: 100%;
height: auto;
border-radius: var(--radius-sm);
box-shadow: var(--shadow-sm);
}

/* ===== Call to Action Section ===== */
.cta {
padding: 6rem 2rem;
background: linear-gradient(135deg, rgba(0, 200, 255, 0.1) 0%, rgba(157, 78, 221, 0.1) 100%);
display: flex;
align-items: center;
justify-content: space-between;
max-width: 1200px;
margin: 0 auto;
border-radius: var(--radius-lg);
overflow: hidden;
position: relative;
}

.cta::before {
content: '';
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
background: url('data:image/svg+xml;utf8,');
opacity: 0.3;
}

.cta-content {
max-width: 600px;
position: relative;
z-index: 1;
}

.cta-image {
max-width: 300px;
position: relative;
z-index: 1;
}

.cta-image img {
max-width: 100%;
height: auto;
}

/* ===== Footer ===== */
.footer {
background-color: var(--background-light);
padding: 5rem 2rem 2rem;
margin-top: auto;
}

.footer-content {
display: flex;
justify-content: space-between;
max-width: 1200px;
margin: 0 auto;
padding-bottom: 3rem;
border-bottom: 1px solid var(--border-color);
}

.footer-logo {
max-width: 300px;
}

.footer-logo span {
font-family: var(--font-secondary);
font-size: 2rem;
font-weight: 700;
letter-spacing: -0.5px;
}

.footer-logo p {
color: var(--text-secondary);
margin-top: 1rem;
}

.footer-links {
display: flex;
gap: 4rem;
}

.footer-links-column {
display: flex;
flex-direction: column;
}

.footer-links-column h4 {
margin-bottom: 1.5rem;
font-size: 1.1rem;
}

.footer-links-column a {
color: var(--text-secondary);
margin-bottom: 0.8rem;
transition: color var(--transition-fast);
}

.footer-links-column a:hover {
color: var(--primary);
}

.footer-bottom {
display: flex;
justify-content: space-between;
align-items: center;
max-width: 1200px;
margin: 2rem auto 0;
}

.footer-bottom p {
color: var(--text-muted);
margin-bottom: 0;
}

.social-links {
display: flex;
gap: 1rem;
}

.social-links a {
color: var(--text-secondary);
font-size: 1.2rem;
transition: all var(--transition-fast);
min-height: 48px;
min-width: 48px;
display: flex;
align-items: center;
justify-content: center;
}

.social-links a:hover {
color: var(--primary);
transform: translateY(-3px);
}

.dropzone {
border: 2px dashed var(--primary);
padding: 2rem;
text-align: center;
cursor: pointer;
border-radius: var(--radius-lg);
background-color: rgba(0, 200, 255, 0.05);
transition: background 0.3s ease;
}

.dropzone:hover {
background-color: rgba(0, 200, 255, 0.1);
}

.dropzone i {
font-size: 2rem;
color: var(--primary);
}

.upload-info-card {
  background: transparent !important;
  padding: 0;
  border: none;
  box-shadow: none;
  color: var(--text-primary);
  margin-top: 2rem;
}

.dataset-info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.info-stat-card {
  background: transparent;
  border: 1px solid rgba(0, 200, 255, 0.2);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  text-align: center;
  transition: all var(--transition-fast);
  /* backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px); */
}

.info-stat-card:hover {
  border-color: rgba(0, 200, 255, 0.4);
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(0, 200, 255, 0.1);
}

.stat-value {
  font-size: 2rem;
  font-weight: 700;
  font-family: var(--font-secondary);
  background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 0.5rem;
  display: block;
}

.stat-label {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.dataset-preview-section {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  /* padding: 1.5rem; */
  margin-top: 1.5rem;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.preview-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.preview-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.1rem;
}

.preview-title {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
}

.dropzone.hovered {
background-color: rgba(0, 200, 255, 0.15);
border-color: var(--primary-dark);
}

.dropzone.dragging {
background-color: rgba(0, 200, 255, 0.2);
border-color: var(--primary-dark);
}

/* Enhanced Table Styling */
.table-scroll {
  overflow-x: auto;
  margin-top: 1rem;
  border: 1px solid rgba(0, 200, 255, 0.2);
  border-radius: var(--radius-md);
  background: transparent;
  /* backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px); */
}

.upload-preview-table {
  min-width: max-content;
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  background: transparent;
}

.upload-preview-table th {
  background: transparent;
  color: var(--primary);
  font-weight: 600;
  padding: 1rem 0.75rem;
  text-align: left;
  border-bottom: 2px solid rgba(0, 200, 255, 0.3);
  position: sticky;
  top: 0;
  z-index: 10;
}

.upload-preview-table td {
  padding: 0.75rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  white-space: nowrap;
}

.upload-preview-table tr:hover td {
  background: transparent;
}

.upload-preview-table tr:nth-child(even) td {
  background: transparent}

.upload-preview-table tr:nth-child(even):hover td {
  background: transparent;
}

/* Success indicator styling */
.upload-success-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: transparent;
  color: var(--success);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 500;
  border: 1px solid rgba(0, 230, 118, 0.3);
  margin-bottom: 1.5rem;
}

.upload-success-badge i {
  font-size: 1rem;
}

/* Mobile responsive improvements */
@media (max-width: 768px) {
  .dataset-info-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
  }
  
  .info-stat-card {
    padding: 1rem;
  }
  
  .stat-value {
    font-size: 1.5rem;
  }
  
  .stat-label {
    font-size: 0.8rem;
  }
  
  .upload-preview-table {
    font-size: 0.8rem;
  }
  
  .upload-preview-table th,
  .upload-preview-table td {
    padding: 0.5rem;
  }
  
  .dataset-preview-section {
    padding: 1rem;
  }
}

@media (max-width: 480px) {
  .dataset-info-grid {
    grid-template-columns: 1fr;
  }
  
  .preview-header {
    flex-direction: column;
    text-align: center;
    gap: 0.5rem;
  }
}

/* Enhanced Preprocessing Styles */
.preprocessing-header {
margin-bottom: 2rem;
text-align: center;
}

.preprocessing-header .form-group {
max-width: 400px;
margin: 0 auto;
}

.preprocessing-tabs {
background: var(--card-bg);
border-radius: var(--radius-lg);
overflow: hidden;
border: 1px solid var(--border-color);
backdrop-filter: blur(10px);
-webkit-backdrop-filter: blur(10px);
margin: 2rem 0;
}

.tab-nav {
display: flex;
background: rgba(20, 26, 41, 0.9);
border-bottom: 1px solid var(--border-color);
}

.tab-btn {
flex: 1;
padding: 1rem 1.5rem;
background: transparent;
border: none;
color: var(--text-secondary);
font-weight: 500;
cursor: pointer;
transition: all var(--transition-fast);
position: relative;
min-height: 48px;
}

.tab-btn::after {
content: '';
position: absolute;
bottom: 0;
left: 0;
width: 0;
height: 3px;
background: transparent;
transition: width var(--transition-normal);
}

.tab-btn.active,
.tab-btn[aria-selected="true"] {
color: var(--text-primary);
}

.tab-btn.active::after,
.tab-btn[aria-selected="true"]::after {
width: 100%;
}

.tab-btn:focus-visible {
outline: 2px solid var(--primary);
outline-offset: -2px;
}

.tab-content {
display: none;
padding: 2rem;
}

.tab-content.active {
display: block;
}

.preprocessing-grid {
background: transparent;
display: grid;
grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
gap: 1.5rem;
}

.preprocessing-card {
background: transparent;
border-radius: var(--radius-md);
padding: 1.5rem;
border: 1px solid var(--border-color);
transition: transform var(--transition-normal);
}

.preprocessing-card:hover {
transform: translateY(-2px);
}

.preprocessing-card h4 {
background: transparent;    
margin-bottom: 1rem;
color: var(--primary);
font-size: 1.1rem;
}

.form-group {
margin-bottom: 1rem;
}

.form-group label {
display: block;
margin-bottom: 0.5rem;
color: var(--text-primary);
font-weight: 500;
}

.form-control {
width: 100%;
padding: 0.75rem;
border: 1px solid var(--border-color);
border-radius: var(--radius-sm);
background: rgba(255, 255, 255, 0.05);
color: var(--text-primary);
font-size: 0.9rem;
transition: border-color var(--transition-fast);
min-height: 48px;
}

.form-control:focus {
outline: none;
border-color: var(--primary);
box-shadow: 0 0 0 2px rgba(0, 200, 255, 0.2);
}

.slider {
width: 100%;
height: 6px;
border-radius: 3px;
background: var(--border-color);
outline: none;
-webkit-appearance: none;
appearance: none;
margin: 0.5rem 0;
}

.slider::-webkit-slider-thumb {
-webkit-appearance: none;
appearance: none;
width: 18px;
height: 18px;
border-radius: 50%;
background: var(--primary);
cursor: pointer;
box-shadow: 0 2px 6px rgba(0, 200, 255, 0.3);
}

.slider::-moz-range-thumb {
width: 18px;
height: 18px;
border-radius: 50%;
background: var(--primary);
cursor: pointer;
border: none;
box-shadow: 0 2px 6px rgba(0, 200, 255, 0.3);
}

.range-inputs {
display: flex;
align-items: center;
gap: 10px;
}

.preprocessing-actions {
text-align: center;
margin: 2rem 0;
}

.preprocessing-result {
margin-top: 2rem;
padding: 1.5rem;
border-radius: var(--radius-md);
background: var(--card-bg);
border: 1px solid var(--border-color);
display: none;
}

.preprocessing-result.show {
display: block;
}

.spinner {
display: flex;
align-items: center;
justify-content: center;
gap: 0.5rem;
color: var(--primary);
font-weight: 500;
margin-top: 1rem;
}

.error-message {
color: var(--error);
background: rgba(255, 82, 82, 0.1);
border: 1px solid rgba(255, 82, 82, 0.3);
padding: 1rem;
border-radius: var(--radius-sm);
margin-top: 1rem;
}

.success-message {
color: var(--success);
background: rgba(0, 230, 118, 0.1);
border: 1px solid rgba(0, 230, 118, 0.3);
padding: 1rem;
border-radius: var(--radius-sm);
margin-top: 1rem;
}

/* Checkbox Styling */
input[type="checkbox"] {
width: 18px;
height: 18px;
margin-right: 8px;
accent-color: var(--primary);
}

/* Fix tab content display issues */
.preprocessing-tabs .tab-content {
display: none;
padding: 2rem;
}

.preprocessing-tabs .tab-content.active {
display: block !important;
}

.preprocessing-tabs .tab-content.active[hidden] {
display: block !important;
}

.preprocessing-tabs .tab-content:not(.active) {
display: none !important;
}

.preprocessing-tabs .tab-content.active {
display: block !important;
visibility: visible !important;
opacity: 1 !important;
}

.dashboard-content .tab-content {
display: none;
}

.dashboard-content .tab-content.active {
display: grid;
}

/* Global style for sliders */
input[type="range"] {
-webkit-appearance: none;
appearance: none;
width: 100%;
height: 6px;
background: var(--border-color);
border-radius: 4px;
outline: none;
transition: background 0.3s;
}

input[type="range"]::-webkit-slider-runnable-track {
height: 6px;
background: linear-gradient(90deg, var(--primary), var(--secondary));
border-radius: 4px;
}

input[type="range"]::-webkit-slider-thumb {
-webkit-appearance: none;
appearance: none;
width: 16px;
height: 16px;
border-radius: 50%;
background: var(--primary);
cursor: pointer;
margin-top: -5px;
box-shadow: 0 0 4px rgba(0, 200, 255, 0.7);
transition: background 0.3s;
}

input[type="range"]::-moz-range-track {
height: 6px;
background: linear-gradient(90deg, var(--primary), var(--secondary));
border-radius: 4px;
}

input[type="range"]::-moz-range-thumb {
width: 16px;
height: 16px;
border-radius: 50%;
background: var(--primary);
cursor: pointer;
box-shadow: 0 0 4px rgba(0, 200, 255, 0.7);
}

.fa-spinner {
font-size: 1.2rem;
color: var(--primary);
}

.preprocessing-tabs .tab-btn {
background: transparent !important;
color: var(--text-secondary) !important;
border: none !important;
}

.preprocessing-tabs .tab-btn.active {
background: linear-gradient(90deg, var(--primary), var(--secondary)) !important;
color: white !important;
}

.preprocessing-tabs .tab-btn::after {
content: '';
position: absolute;
bottom: 0;
left: 0;
width: 0%;
height: 3px;
background: linear-gradient(90deg, var(--primary), var(--secondary));
transition: width var(--transition-fast);
}

.preprocessing-tabs .tab-btn:hover::after {
width: 100%;
}

.preprocessing-tabs .tab-btn.active::after {
width: 100%;
}

.preprocessing-tabs .tab-btn:not(.active):hover {
color: var(--text-primary) !important;
}

/* ===== MOBILE RESPONSIVE STYLES ===== */

/* Tablet Styles */
@media (max-width: 1024px) {
.hero {
padding: 6rem 3% 3rem;
}

.features-grid,
.models-grid {
grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
gap: 1.5rem;
}

.step {
flex-direction: column;
text-align: center;
}

.step-number {
margin-right: 0;
margin-bottom: 1rem;
}

.step-image {
margin-left: 0;
margin-top: 1rem;
}

.cta {
flex-direction: column;
text-align: center;
gap: 2rem;
}

.footer-content {
flex-direction: column;
gap: 3rem;
}

.footer-links {
justify-content: space-around;
}
}

/* Mobile Styles */
@media (max-width: 768px) {
/* Navigation */
.navbar {
padding: 1rem;
justify-content: center;
}

.nav-links {
display: none !important;
}

.nav-actions {
display: none;
}

/* Hero Section - SHOW CONTENT ON MOBILE */
.hero {
padding: 6rem 1rem 3rem;
text-align: center;
display: flex;
flex-direction: row;
align-items: center;
justify-content: space-between;
overflow: hidden;
}

.hero-content {
flex: 1;
max-width: 60%;
z-index: 1;
text-align: left;
margin: 0;
display: block !important;
visibility: visible !important;
opacity: 1 !important;
}

.hero-title {
font-size: clamp(1.8rem, 6vw, 2.5rem);
margin-bottom: 1rem;
display: block !important;
visibility: visible !important;
line-height: 1.2;
text-align: left;
}

.hero-subtitle {
font-size: clamp(0.9rem, 3vw, 1.1rem);
margin-bottom: 1.5rem;
display: block !important;
visibility: visible !important;
color: var(--text-secondary);
text-align: left;
}

.hero-actions {
display: flex !important;
visibility: visible !important;
justify-content: flex-start;
margin-bottom: 0;
}

.hero-image {
flex: 1;
max-width: 35%;
margin-left: 1rem;
}

.hero svg,
.hero img {
max-width: 100%;
height: auto;
overflow: hidden;
}

/* Force visibility of all hero content */
.hero-content * {
display: block !important;
visibility: visible !important;
opacity: 1 !important;
}

.hero-actions {
display: flex !important;
}

.btn {
width: auto;
max-width: 200px;
font-size: 0.9rem;
padding: 0.6rem 1.2rem;
}

/* Sections */
.features,
.how-it-works,
.models,
.dashboard-preview,
.cta {
padding: 4rem 1rem;
}

.features-grid,
.models-grid {
grid-template-columns: 1fr;
gap: 1.5rem;
}

/* Dashboard */
.dashboard-tabs {
flex-direction: column;
}

.tab-content.active {
display: block;
}

.dashboard-content {
padding: 1rem;
}

/* Preprocessing */
.tab-nav {
flex-direction: column;
}

.preprocessing-grid {
grid-template-columns: 1fr;
}

.range-inputs {
flex-direction: column;
align-items: stretch;
}

.range-inputs span {
text-align: center;
margin: 0.5rem 0;
}

/* Tables */
.table-scroll {
font-size: 0.8rem;
}

.upload-preview-table th,
.upload-preview-table td {
padding: 0.3rem;
font-size: 0.8rem;
}

/* Footer */
.footer {
padding: 3rem 1rem 1rem;
}

.footer-links {
flex-direction: column;
gap: 2rem;
}

.footer-bottom {
flex-direction: column;
gap: 1rem;
text-align: center;
}

/* Form Elements */
.form-control {
font-size: 16px; /* Prevents zoom on iOS */
}

/* Step Layout */
.step {
margin-bottom: 3rem;
}

.step-content h3 {
font-size: 1.5rem;
}

.step-content p {
font-size: 1rem;
}

/* Fix correlation heatmap overflow */
#corrHeatmap {
width: 100% !important;
max-width: 100% !important;
overflow: hidden !important;
margin: 0 !important;
padding: 0 !important;
}

/* Ensure plotly charts fit mobile screens */
.js-plotly-plot {
width: 100% !important;
max-width: 100% !important;
overflow: hidden !important;
}

/* Fix any chart containers */
#columnChart,
#corrHeatmap,
.plotly-graph-div {
width: 100% !important;
max-width: calc(100vw - 2rem) !important;
margin: 0 auto !important;
overflow: hidden !important;
}
}

/* Small Mobile Styles */
@media (max-width: 480px) {
.hero {
flex-direction: column;
text-align: center;
padding: 5rem 0.5rem 2rem;
}

.hero-content {
max-width: 100%;
text-align: center;
margin-bottom: 1.5rem;
}

.hero-title {
text-align: center;
}

.hero-subtitle {
text-align: center;
}

.hero-actions {
justify-content: center;
}

.hero-image {
max-width: 80%;
margin-left: 0;
}

.features,
.how-it-works,
.models,
.dashboard-preview,
.cta {
padding: 3rem 0.5rem;
}

.feature-card,
.model-card,
.preprocessing-card {
padding: 1.5rem;
}

.btn {
padding: 0.75rem 1rem;
font-size: 0.9rem;
}

.dashboard-content,
.tab-content {
padding: 1rem;
}

h1 {
font-size: 2rem;
}

h2 {
font-size: 1.75rem;
}

h3 {
font-size: 1.5rem;
}

.step-number {
width: 4rem;
height: 4rem;
font-size: 1.5rem;
}
}

/* Prevent any content from overflowing on mobile */
@media (max-width: 768px) {
* {
max-width: 100vw;
overflow-x: hidden;
}

body {
overflow-x: hidden;
}

.app-container {
overflow-x: hidden;
width: 100%;
}

/* Fix any absolute positioned elements */
.hero *[style*="position: absolute"] {
max-width: 100% !important;
}

/* Ensure analyze section content fits */
.analyze-section,
#analyzeContent {
width: 100%;
overflow-x: hidden;
}

/* Fix chart containers specifically */
.chart-container,
.plotly-graph-div {
width: 100% !important;
max-width: 100% !important;
box-sizing: border-box;
}
}

/* Touch-friendly improvements */
@media (hover: none) and (pointer: coarse) {
.btn:hover,
.feature-card:hover,
.model-card:hover {
transform: none;
}

.btn:active {
transform: scale(0.98);
}

.feature-card:active,
.model-card:active {
transform: scale(0.98);
}
}

/* Landscape mobile orientation */
@media (max-width: 768px) and (orientation: landscape) {
.hero {
padding: 4rem 1rem 2rem;
min-height: 80vh;
}

.hero-title {
font-size: 2.5rem;
}
}


/* Target only background properties, preserve text and button colors */
.preprocessing-tabs,
.tab-nav,
.tab-content,
.preprocessing-grid,
.preprocessing-card,
.preprocessing-header,
.preprocessing-actions,
.preprocessing-result,
#preprocess,
#preprocess .step-card {
  background: transparent !important;
  background-color: transparent !important;
  backdrop-filter: none !important;
  -webkit-backdrop-filter: none !important;
  box-shadow: none !important;
}

/* Preserve your existing highlight styling - gradient text effect */
.highlight,
span.highlight,
.logo .highlight {
  background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%) !important;
  -webkit-background-clip: text !important;
  background-clip: text !important;
  color: transparent !important;
  display: inline !important;
}

/* Preserve your existing preprocessing tab styling */
.preprocessing-tabs .tab-btn {
  background: transparent !important;
  color: var(--text-secondary) !important;
  border: none !important;
}

.preprocessing-tabs .tab-btn.active {
  background: linear-gradient(90deg, var(--primary), var(--secondary)) !important;
  color: white !important;
}

.preprocessing-tabs .tab-btn::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  transition: width var(--transition-fast);
}

.preprocessing-tabs .tab-btn.active::after {
  width: 100%;
}

/* Preserve regular button styling */
button,
.btn,
input[type="button"],
input[type="submit"] {
  background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%) !important;
  color: white !important;
  border: none !important;
  padding: 0.75rem 1.5rem !important;
  border-radius: var(--radius-md) !important;
}

/* Preserve your existing button hover effects */
button:hover,
.btn:hover {
  box-shadow: 0 6px 20px rgba(0, 200, 255, 0.4) !important;
  transform: translateY(-2px) !important;
}

/* Keep form element backgrounds slightly visible */
input, select, textarea {
  background: rgba(255, 255, 255, 0.05) !important;
  border: 1px solid white; 
  border-radius: 8px;
  color: var(--text-primary) !important;
  border: 1px solid var(--border-color) !important;
}

/* Make preprocessing dropdowns match other sections */
/* #preprocess select,
.preprocessing-card select,
.form-control {
  border: 1px solid white !important;
  border-radius: 8px !important;
  background: transparent !important;
  color: var(--text-primary) !important;
} */

select{
  border: 1px solid var(--primary-dark) !important;
  border-radius: 8px !important;
  background: transparent !important;
  color: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%) !important;
}



/* Dashboard tabs — only the active one is filled */
.dashboard-tabs .tab-btn {
  background: transparent !important;
  color: var(--text-secondary) !important;
  border: none !important;
  box-shadow: none !important;
}

.dashboard-tabs .tab-btn.active {
  background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%) !important;
  color: #fff !important;
}

.dashboard-tabs .tab-btn::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0;
  width: 0; height: 3px;
  background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
  transition: width var(--transition-normal);
}

.dashboard-tabs .tab-btn:hover:not(.active)::after,
.dashboard-tabs .tab-btn.active::after {
  width: 100%;
}

.analysis-section {
  margin-top: 2rem;
  padding: 1rem;
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-color);
}

.plot-container {
  width: 100%;
  min-height: 400px;
}

.eda-container {
  margin-top: 1rem;
  overflow-x: auto;
}

.upload-preview-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
}

.upload-preview-table th,
.upload-preview-table td {
  border: 1px solid var(--border-color);
  padding: 0.5rem;
  text-align: center;
}

.upload-preview-table th {
  background: rgba(255,255,255,0.05);
}