:root {
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --bg-color: #f8fafc;
  --panel-bg: #ffffff;
  --text-primary: #0f172a;
  --text-secondary: #64748b;
  --border-color: #e2e8f0;
  --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  --card-shadow-hover: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --header-height: 72px;
  --radius-lg: 12px;
  --transition: all 0.2s ease-in-out;
}

/* Spin animation for loading spinner */
@keyframes spin {
  from {
    transform: rotate(0deg);
  }

  to {
    transform: rotate(360deg);
  }
}

.animate-spin {
  animation: spin 0.8s linear infinite;
  display: inline-block;
}

/* Indeterminate progress bar animation */
@keyframes indeterminate {
  0% {
    transform: translateX(-250%);
  }

  100% {
    transform: translateX(350%);
  }
}

/* Shimmer for upload progress bar */
@keyframes shimmer {
  0% {
    left: -60%;
  }

  100% {
    left: 110%;
  }
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-color: var(--bg-color);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  text-rendering: optimizeSpeed;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.2;
}

a {
  text-decoration: none;
  color: inherit;
}

button {
  cursor: pointer;
  border: none;
  font-family: 'Roboto', sans-serif;
  transition: var(--transition);
}

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

/* Navbar */
.navbar {
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(12px) saturate(180%);
  -webkit-backdrop-filter: blur(12px) saturate(180%);
  border-bottom: 1px solid rgba(255, 255, 255, 0.3);
  display: flex;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 50;
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.nav-brand {
  font-weight: 900;
  font-size: 26px;
  display: flex;
  align-items: center;
  gap: 6px;
  background: linear-gradient(135deg, #1e293b 0%, #475569 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.8px;
}

.nav-brand-icon {
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-links {
  display: flex;
  gap: 24px;
  align-items: center;
  margin-left: 32px;
  flex: 1;
}

.nav-link {
  font-weight: 600;
  color: #1d1d1f;
  transition: var(--transition);
  font-size: 14px;
  letter-spacing: 0.3px;
}

.nav-link:hover {
  color: var(--primary);
}

.nav-actions {
  display: flex;
  gap: 16px;
  align-items: center;
}

.btn-login {
  font-weight: 500;
  font-size: 14px;
  color: #333333;
  background: transparent;
  padding: 8px 12px;
}

.btn-login:hover {
  color: var(--primary);
}

.btn-signup {
  background: var(--primary);
  color: white;
  padding: 8px 16px;
  border-radius: 4px;
  font-weight: 500;
  font-size: 14px;
}

.btn-signup:hover {
  background: var(--primary-hover);
}

/* Base button styling */
.btn-primary {
  background-color: var(--primary) !important;
  color: #ffffff !important;
  padding: 12px 24px;
  border-radius: 8px;
  font-weight: 500;
  font-size: 15px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  box-shadow: 0 2px 4px rgba(79, 70, 229, 0.2);
  transition: var(--transition);
}

.btn-primary:hover {
  background: var(--primary-hover) !important;
  transform: translateY(-1px);
  box-shadow: 0 4px 8px rgba(79, 70, 229, 0.3);
}

/* Hero Section */
.hero-wrapper {
  background: linear-gradient(135deg, #e0e7ff 0%, #f8fafc 100%);
  position: relative;
  overflow: hidden;
  padding: 80px 0 40px;
}

/* Subtle pattern for background */
.hero-wrapper::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: radial-gradient(#cbd5e1 1px, transparent 1px);
  background-size: 24px 24px;
  opacity: 0.5;
  z-index: 0;
}

.hero {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 850px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 52px;
  margin-bottom: 20px;
  color: #1d1d1f;
  font-weight: 800;
  letter-spacing: -1px;
}

.hero p {
  font-size: 22px;
  color: #333336;
  margin-bottom: 0;
  line-height: 1.5;
  font-weight: 500;
}

/* Tool Filters */
.tool-filters {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin: 40px 0 20px;
  flex-wrap: wrap;
  position: relative;
  z-index: 1;
}

.filter-btn {
  padding: 10px 24px;
  border-radius: 99px;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(0, 0, 0, 0.06);
  color: #1d1d1f;
  font-weight: 600;
  font-size: 14px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.02);
  transition: var(--transition);
}

.filter-btn:hover {
  background: #f5f5f5;
}

.filter-btn.active {
  background: #333333;
  color: white;
  border-color: #333333;
}

/* Tools Grid */
.tools-section {
  padding: 30px 0 80px;
  background: var(--bg-color);
}

/* Blend the background nicely */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}

.tool-card {
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: 20px;
  padding: 28px;
  display: flex;
  flex-direction: column;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.tool-card:hover {
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  transform: translateY(-8px) scale(1.02);
  background: #ffffff;
  border-color: var(--primary);
}

.tool-icon {
  width: 54px;
  height: 54px;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 16px;
}

.icon-arrow-badge {
  position: absolute;
  bottom: -4px;
  right: -4px;
  background-color: white;
  border-radius: 50%;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
}

.tool-card h3 {
  font-size: 20px;
  margin-bottom: 10px;
  color: #1d1d1f;
  font-weight: 700;
  letter-spacing: -0.3px;
}

.tool-card p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.5;
  flex-grow: 1;
}

/* Tool Page */
.tool-page {
  padding: 60px 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  flex: 1;
}

.tool-header {
  text-align: center;
  margin-bottom: 40px;
}

.tool-header h1 {
  font-size: 40px;
  margin-bottom: 16px;
}

.tool-header p {
  font-size: 20px;
  color: #555555;
}

/* Upload Area */
.upload-area {
  width: 100%;
  max-width: 800px;
  height: 350px;
  border: 2px dashed #818cf8;
  border-radius: 16px;
  background: #e0e7ff;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: var(--transition);
}

.upload-area:hover,
.upload-area.active {
  background: #c7d2fe;
  border-color: var(--primary);
  transform: translateY(-2px);
}

.btn-upload {
  background-color: var(--primary) !important;
  color: #ffffff !important;
  border: none;
  border-radius: 8px;
  padding: 14px 36px;
  font-size: 16px;
  font-weight: 600;
  font-family: inherit;
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
  pointer-events: auto;
  transition: var(--transition);
}

.btn-upload:hover {
  background: var(--primary-hover) !important;
  box-shadow: 0 8px 16px rgba(79, 70, 229, 0.35);
  transform: translateY(-1px);
}

.upload-sub {
  font-size: 16px;
  color: #555555;
  margin-top: 24px;
}

/* iLovePDF-style File Preview Cards */
.preview-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  justify-content: center;
  align-items: flex-start;
  padding: 20px;
}

.file-preview-card {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(10px);
  border-radius: 16px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.04);
  border: 1px solid rgba(0, 0, 0, 0.05);
  padding: 24px 16px 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  width: 140px;
  text-align: center;
  position: relative;
  transition: var(--transition);
  cursor: default;
}

.file-preview-card:hover {
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.08);
  transform: translateY(-4px);
}

.file-card-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  filter: drop-shadow(0 3px 6px rgba(229, 50, 45, 0.2));
}

.file-card-name {
  font-size: 12px;
  font-weight: 600;
  color: #333;
  word-break: break-all;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.4;
  max-width: 100%;
}

.file-card-size {
  font-size: 11px;
  color: #999;
  font-weight: 400;
}

.file-card-remove {
  position: absolute;
  top: -8px;
  right: -8px;
  background: #ef4444;
  /* red-500 */
  color: white;
  border: 2px solid white;
  border-radius: 8px;
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  transition: var(--transition);
  opacity: 0;
}

.file-preview-card:hover .file-card-remove {
  opacity: 1;
}

.file-card-remove:hover {
  background: #dc2626;
  /* red-600 */
  transform: translateY(-1px);
}

/* Add more files card */
.file-preview-add {
  background: transparent;
  border: 2px dashed rgba(0, 0, 0, 0.1);
  box-shadow: none;
  cursor: pointer;
  justify-content: center;
  min-height: 160px;
}

.file-preview-add:hover {
  border-color: rgba(0, 0, 0, 0.2);
  background: rgba(0, 0, 0, 0.02);
  transform: scale(1.02);
}


/* Result Page */
.result-box {
  background: white;
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 50px 40px;
  text-align: center;
  max-width: 600px;
  width: 100%;
  box-shadow: var(--card-shadow-hover);
  margin-top: 40px;
}

.btn-download {
  background-color: var(--primary) !important;
  color: #ffffff !important;
  padding: 14px 28px;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin: 24px 0;
  text-decoration: none;
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.2);
  transition: var(--transition);
}

.btn-download:hover {
  background: var(--primary-hover) !important;
  transform: translateY(-1px);
  box-shadow: 0 6px 14px rgba(79, 70, 229, 0.3);
}

/* Footer Group */
.footer {
  background: #fdfdfd;
  border-top: 1px solid #f0f0f0;
  padding: 60px 0 24px;
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 40px;
  margin-bottom: 40px;
}

.footer-col h4 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--primary);
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 12px;
}

.footer-links a {
  color: #333333;
  font-size: 14px;
}

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

/* Mobile Specific */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .nav-brand span {
    font-size: 20px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .footer-col[style*="gridColumn"] {
    grid-column: span 1 !important;
  }

  .hero h1 {
    font-size: 32px;
  }

  .hero p {
    font-size: 16px;
  }

  .tool-filters {
    gap: 8px;
    padding: 0 10px;
  }

  .filter-btn {
    padding: 6px 14px;
    font-size: 13px;
  }
}

.workspace {
  width: 100%;
  display: flex;
  min-height: 500px;
}

.workspace-main {
  flex: 1;
  background: #fbfbfd;
  padding: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.workspace-sidebar {
  width: 320px;
  background: white;
  border-left: 1px solid #e0e0e0;
  padding: 24px;
  display: flex;
  flex-direction: column;
}

.workspace-sidebar-title {
  font-size: 26px;
  font-weight: 800;
  color: #333333;
  margin-bottom: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid #e0e0e0;
  text-align: center;
}

.options-group {
  margin-bottom: 20px;
  background: #eef4ff;
  border: 1.5px solid #3b82f6;
  border-radius: 10px;
  padding: 16px;
}

.radio-label {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px;
  border: 1px solid #e0e0e0;
  border-radius: 8px;
  margin-bottom: 8px;
  cursor: pointer;
  transition: all 0.2s;
}

.radio-label:hover {
  background: #fdfdfd;
  border-color: var(--primary);
}

.radio-label input[type="radio"] {
  margin-top: 4px;
}

.input-field {
  width: 100%;
  padding: 12px;
  border: 1px solid #e0e0e0;
  border-radius: 8px;
  font-family: 'Roboto', sans-serif;
  font-size: 14px;
  margin-top: 8px;
}

.input-field:focus {
  outline: none;
  border-color: var(--primary);
}

/* Visibility Helpers for PageSpeed (avoid layout shifts) */
.desktop-only {
  display: none !important;
}

@media (min-width: 769px) {
  .desktop-only {
    display: inline-flex !important;
  }
}

.mobile-only {
  display: none !important;
}

@media (max-width: 768px) {
  .mobile-only {
    display: inline-flex !important;
  }
}