/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
  /* Typography */
  --font-display: 'Syne', sans-serif;
  --font-body: 'Inter', sans-serif;

  /* Backgrounds — warm off-white with subtle yellow tint */
  --bg-primary: #f8f7f4;
  --bg-secondary: #f0efe9;
  --bg-tertiary: #e8e6de;
  --bg-glass: rgba(255, 255, 255, 0.7);

  /* Text */
  --text-primary: #111010;
  --text-secondary: #4a4845;
  --text-tertiary: #8a8680;
  --text-inverse: #ffffff;

  /* Brand gradient — electric indigo → vivid violet → hot pink */
  --accent-1: #5c4ef5;
  --accent-2: #8b5cf6;
  --accent-3: #e040fb;
  --gradient-brand: linear-gradient(135deg, #5c4ef5 0%, #8b5cf6 50%, #e040fb 100%);
  --gradient-brand-hover: linear-gradient(135deg, #4a3dd4 0%, #7a4de0 50%, #cc30e5 100%);
  --gradient-accent: linear-gradient(135deg, var(--accent-1) 0%, var(--accent-2) 100%);
  --gradient-subtle: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
  --gradient-fantastic: linear-gradient(135deg, #ede9fe 0%, #f3e8ff 50%, #fce7f3 100%);

  /* 3D Button shadows */
  --btn-shadow-color: rgba(92, 78, 245, 0.35);
  --btn-bottom-depth: 5px;    /* the "3D ledge" */
  --btn-bottom-color: #3a2fd4;

  /* Neumorphic surfaces */
  --neu-bg: #f0efe9;
  --neu-shadow-light: -6px -6px 14px rgba(255, 255, 255, 0.85);
  --neu-shadow-dark: 6px 6px 14px rgba(0, 0, 0, 0.13);
  --neu-inset-light: inset -4px -4px 8px rgba(255, 255, 255, 0.9);
  --neu-inset-dark: inset 4px 4px 8px rgba(0, 0, 0, 0.1);
  --neu-shadow-medium: 0px 0px 14px rgba(0, 0, 0, 0.07);
  --neu-shadow-soft: 0px 0px 14px rgba(0, 0, 0, 0.03);

  /* Borders */
  --border-subtle: rgba(0, 0, 0, 0.07);
  --border-medium: rgba(0, 0, 0, 0.12);
  --border-primary: rgba(0, 0, 0, 0.12);
  
  /* Additional variables for modal system */
  --accent-primary: var(--accent-1);
  --accent-secondary: var(--accent-2);
  --accent-tertiary: var(--error);
  
  /* Enhanced transitions */
  --transition: all 0.25s ease;
  --transition-bounce: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  --transition-fast: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Enhanced shadows */
  --shadow-soft: 0 4px 20px rgba(0,0,0,0.08);
  --shadow-medium: 0 10px 40px rgba(0,0,0,0.12);

  /* Feedback */
  --success: #00c875;
  --success-bg: #e6faf2;
  --error: #ff4757;
  --error-bg: #ffe0e3;
  --warning: #ffa502;
  --warning-bg: #fff3e0;

  /* Misc */
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-full: 9999px;
  
  /* Additional variables for modal system */
  --accent-primary: var(--accent-1);
  --accent-secondary: var(--accent-2);
  --accent-tertiary: var(--error);
  
  /* Enhanced transitions */
  --transition: all 0.25s ease;
  --transition-bounce: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  --transition-fast: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Enhanced shadows */
  --shadow-soft: 0 4px 20px rgba(0,0,0,0.08);
  --shadow-medium: 0 10px 40px rgba(0,0,0,0.12);
}

/* Dark theme */
[data-theme="dark"] {
  /* Backgrounds — dark slate */
  --bg-primary: #1a1a1a;
  --bg-secondary: #2d2d2d;
  --bg-tertiary: #404040;
  --bg-quaternary: #5c5c5c;
  
  /* Text — light colors for dark background */
  --text-primary: #ffffff;
  --text-secondary: #e0e0e0;
  --text-tertiary: #b0b0b0;
  --text-inverse: #111010;
  
  /* Accents — vibrant gradient */
  --accent-1: #7c6ff5;
  --accent-2: #9b7cf6;
  --accent-3: #f060fb;
  --accent-4: #ec4899;
  
  /* Gradients — fantastic web */
  --gradient-brand: linear-gradient(135deg, #7c6ff5 0%, #9b7cf6 50%, #f060fb 100%);
  --gradient-accent: linear-gradient(135deg, var(--accent-1) 0%, var(--accent-2) 100%);
  --gradient-subtle: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
  --gradient-fantastic: linear-gradient(135deg, #ff6b6b 0%, #4ecdc4 50%, #45b7d1 100%);
  
  /* Borders — light for dark theme */
  --border-subtle: rgba(255, 255, 255, 0.1);
  --border-medium: rgba(255, 255, 255, 0.2);
  --border-primary: rgba(255, 255, 255, 0.2);
  
  /* Shadows — neumorphic */
  --neu-shadow-light: -6px -6px 14px rgba(0, 0, 0, 0.3);
  --neu-shadow-dark: 6px 6px 14px rgba(0, 0, 0, 0.6);
  --neu-inset-light: inset -4px -4px 8px rgba(255, 255, 255, 0.05);
  --neu-inset-dark: inset 4px 4px 8px rgba(0, 0, 0, 0.3);

  /* Feedback — adjusted for dark */
  --success-bg: rgba(0, 200, 117, 0.2);
  --error-bg: rgba(255, 71, 87, 0.2);
  --warning-bg: rgba(255, 165, 2, 0.2);
}

/* Base styles */
html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    transition: all var(--transition);
    font-weight: 400;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Focus styles for accessibility */
:focus-visible {
    outline: 2px solid var(--accent-1);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* Skip link for accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--accent-1);
    color: white;
    padding: 8px;
    text-decoration: none;
    border-radius: var(--radius-sm);
    z-index: 10000;
    transition: top var(--transition);
}

.skip-link:focus {
    top: 6px;
}

/* Container */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 30px;
    position: relative;
    z-index: 1;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 60px;
    animation: fadeInDown 1s var(--transition);
}

.logo {
    display: inline-block;
    font-size: 3.5rem;
    font-weight: 900;
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 20px;
}

.hero {
  text-align: center;
  padding: 60px 20px;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 16px;
  letter-spacing: -1px;
}

.hero p {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* About section */
.about-section {
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    padding: 40px;
    margin: 40px 0;
    border: 1px solid var(--border-medium);
    position: relative;
    box-shadow: var(--neu-shadow-light), var(--neu-shadow-dark);
}

.about-title {
    color: var(--text-primary);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.about-icon {
    width: 40px;
    height: 40px;
    background: var(--gradient-brand);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 20px;
    box-shadow: var(--neu-shadow-light), var(--neu-shadow-dark);
}

.about-text {
    line-height: 1.7;
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 25px;
}

.about-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin-top: 25px;
}

/* Savings Badge */
.savings-badge {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--gradient-brand);
  border-radius: 50%;
  width: 120px;
  height: 120px;
  box-shadow:
    0 8px 0 var(--btn-bottom-color),
    0 16px 32px var(--btn-shadow-color);
  margin: 0 auto 32px;
  animation: badge-pop 0.5s 0.35s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

@keyframes badge-pop {
  from { transform: scale(0) rotate(-15deg); opacity: 0; }
  to { transform: scale(1) rotate(0deg); opacity: 1; }
}

.savings-percent {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 800;
  color: white;
  line-height: 1;
}

.savings-label {
  font-size: 0.75rem;
  font-weight: 700;
  color: rgba(255,255,255,0.85);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* Feature Cards - 3D Hover Effects */
.feature {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  border: 1px solid var(--border-subtle);
  box-shadow: var(--neu-shadow-light), var(--neu-shadow-dark);
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow var(--transition);
  cursor: default;
}

.feature:hover {
  transform: translateY(-8px) rotate(-0.5deg);
  box-shadow:
    var(--neu-shadow-light),
    0 20px 40px rgba(0,0,0,0.12),
    0 0 0 1px var(--border-medium);
}

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: var(--gradient-brand);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  color: white;
  box-shadow:
    0 6px 0 var(--btn-bottom-color),
    0 10px 20px var(--btn-shadow-color);
  transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.feature:hover .feature-icon {
  transform: translateY(-4px);
}

.feature-text h3 {
    color: var(--text-primary);
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.feature-text p {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.5;
}

/* Main content area */
.main-content {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: 60px;
    box-shadow: 
        0 25px 50px rgba(0,0,0,0.15),
        0 15px 35px rgba(0,0,0,0.08),
        inset 0 2px 4px rgba(255, 255, 255, 0.1);
    animation: fadeInUp 1s var(--transition);
    position: relative;
    border: 1px solid var(--border-medium);
    z-index: 5;
}

/* Upload area - Fantastic enhanced design */
.upload-area {
  background: var(--gradient-fantastic);
  border: 3px solid transparent;
  border-radius: var(--radius-xl);
  padding: 60px 40px;
  text-align: center;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: var(--transition-bounce);
  box-shadow: var(--shadow-medium);
  backdrop-filter: blur(10px);
  min-height: 280px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.upload-area::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(45deg, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0.05) 100%);
  border-radius: inherit;
  z-index: 1;
}

/* Animated gradient ring on hover */
.upload-area::after {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: inherit;
  background: conic-gradient(from 0deg, var(--accent-1), var(--accent-2), var(--accent-3), var(--accent-4), var(--accent-1));
  z-index: -1;
  opacity: 0;
  transition: var(--transition-fast);
  animation: gradient-rotate 3s linear infinite;
}

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

.upload-area:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: 0 20px 60px rgba(78, 107, 212, 0.15);
}

.upload-area:hover::after {
  opacity: 0.6;
}

.upload-area.dragover {
  transform: scale(1.05);
  border-color: var(--accent-1);
  box-shadow: 0 0 40px rgba(78, 107, 212, 0.2);
}

.upload-area.dragover::after {
  opacity: 1;
}

/* Upload icon with enhanced animation */
.upload-icon {
  width: 80px;
  height: 80px;
  background: var(--gradient-brand);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 24px;
  position: relative;
  z-index: 2;
  box-shadow: var(--shadow-soft);
  transition: var(--transition-bounce);
}

.upload-icon i {
  font-size: 2.2rem;
  color: var(--text-inverse);
  animation: icon-float 3s ease-in-out infinite;
}

@keyframes icon-float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-10px); }
}

/* Upload text with better styling */
.upload-area p {
  color: var(--text-inverse);
  font-size: 1.3rem;
  font-weight: 700;
  margin: 16px 0 8px 0;
  text-shadow: 0 2px 8px rgba(0,0,0,0.3);
  z-index: 2;
  position: relative;
}

.upload-area .upload-hint {
  color: var(--text-inverse);
  font-size: 0.95rem;
  opacity: 0.9;
  margin-top: 8px;
  text-shadow: 0 1px 4px rgba(0,0,0,0.2);
}

/* Upload icon pulse on dragover */
.upload-area.dragover .upload-icon {
  animation: pulse-scale 0.6s ease-in-out infinite alternate;
  background: var(--gradient-accent);
}

@keyframes pulse-scale {
  0% { transform: scale(1); }
  100% { transform: scale(1.1); }
}

/* Toast notification system */
.toast-container {
  position: fixed;
  bottom: 32px;
  right: 32px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  z-index: 9999;
  pointer-events: none;
}

.toast {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-medium);
  border-left: 4px solid var(--accent-1);
  border-radius: var(--radius-md);
  padding: 14px 20px;
  font-size: 0.9rem;
  font-weight: 600;
  box-shadow:
    0 8px 0 rgba(0,0,0,0.1),
    0 16px 32px rgba(0,0,0,0.15);
  pointer-events: auto;
  animation: toast-in 0.35s 0.35s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
  max-width: 340px;
}

.toast.success { border-left-color: var(--success); }
.toast.error { border-left-color: var(--error); }
.toast.warning { border-left-color: var(--warning); }

@keyframes toast-in {
  from { transform: translateX(120%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

@keyframes toast-out {
  from { transform: translateX(0); opacity: 1; }
  to { transform: translateX(120%); opacity: 0; }
}

/* Enhanced sliders with fill color */
.slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 8px;
  border-radius: var(--radius-full);
  background: linear-gradient(
    to right,
    var(--accent-1) 0%,
    var(--accent-2) var(--fill-pct, 80%),
    var(--bg-tertiary) var(--fill-pct, 80%),
    var(--bg-tertiary) 100%
  );
  outline: none;
  cursor: pointer;
  box-shadow: var(--neu-inset-dark), var(--neu-inset-light);
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--gradient-brand);
  border: 3px solid var(--bg-primary);
  box-shadow:
    0 4px 0 rgba(92, 78, 245, 0.4),
    0 6px 12px rgba(0,0,0,0.2);
  cursor: grab;
  transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow var(--transition);
}

.slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
  box-shadow:
    0 6px 0 rgba(92, 78, 245, 0.5),
    0 10px 20px rgba(0,0,0,0.25);
}

.slider::-webkit-slider-thumb:active {
  cursor: grabbing;
  transform: scale(1.05) translateY(3px);
  box-shadow: 0 0 0 rgba(92, 78, 245, 0.4);
}

/* Upload icon styles */
.upload-icon {
  font-size: 5rem;
  color: var(--accent-1);
  margin-bottom: 25px;
  filter: drop-shadow(3px 3px 6px rgba(0,0,0,0.08));
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-10px); }
}

.upload-text {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
    letter-spacing: -0.5px;
}

.upload-subtext {
    font-size: 1.1rem;
    color: var(--text-tertiary);
    font-weight: 500;
}

/* Topbar */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 40px;
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  position: sticky;
  top: 0;
  z-index: 100;
}

.topbar-logo {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: -0.02em;
  transition: all var(--transition);
}

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

/* Enhanced Theme toggle with fantastic design */
.theme-toggle {
  position: relative;
  background: var(--gradient-fantastic);
  border: none;
  border-radius: var(--radius-full);
  padding: 12px 20px;
  cursor: pointer;
  overflow: hidden;
  transition: var(--transition-bounce);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(10px);
}

.theme-toggle::before {
  content: '';
  position: absolute;
  inset: 0;
  background: conic-gradient(from 0deg, var(--accent-1), var(--accent-2), var(--accent-3), var(--accent-4), var(--accent-1));
  z-index: -1;
  opacity: 0.3;
  animation: gradient-rotate 4s linear infinite;
}

.theme-toggle:hover {
  transform: translateY(-2px) scale(1.05);
  box-shadow: 0 8px 25px rgba(78, 107, 212, 0.25);
}

.theme-toggle:active {
  transform: translateY(0) scale(0.98);
}

.theme-toggle-icon {
  position: relative;
  z-index: 2;
  color: var(--text-inverse);
  font-weight: 700;
  font-size: 1rem;
  transition: var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 8px;
}

.theme-toggle-icon.spinning {
  transform: rotate(360deg);
}

/* Enhanced theme toggle animations */
[data-theme="light"] .theme-toggle {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
}

[data-theme="dark"] .theme-toggle {
  background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 50%, #404040 100%);
}

/* ===== TRUE 3D BUTTON SYSTEM ===== */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 16px 36px;
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  outline: none;
  user-select: none;
  -webkit-user-select: none;
  /* 3D illusion: translateY + bottom box-shadow = depth */
  transform: translateY(0px);
  transition:
    transform var(--transition),
    box-shadow var(--transition),
    filter var(--transition);
  /* Prevent layout shift during press */
  will-change: transform;
}

/* Shine overlay */
.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(
    175deg,
    rgba(255,255,255,0.22) 0%,
    rgba(255,255,255,0.06) 45%,
    transparent 100%
  );
  pointer-events: none;
}

/* Primary (brand gradient) */
.btn-primary {
  background: var(--gradient-brand);
  color: #ffffff;
  box-shadow:
    0 var(--btn-bottom-depth) 0 var(--btn-bottom-color),
    0 8px 24px var(--btn-shadow-color),
    0 2px 6px rgba(0,0,0,0.15);
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-3px);
  box-shadow:
    0 calc(var(--btn-bottom-depth) + 3px) 0 var(--btn-bottom-color),
    0 14px 32px var(--btn-shadow-color),
    0 4px 10px rgba(0,0,0,0.2);
  filter: brightness(1.06);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(var(--btn-bottom-depth));
  box-shadow:
    0 0px 0 var(--btn-bottom-color),
    0 2px 8px var(--btn-shadow-color);
  filter: brightness(0.95);
}

/* Secondary (ghost/surface) */
.btn-secondary {
  background: var(--bg-secondary);
  color: var(--text-primary);
  box-shadow:
    var(--neu-shadow-light),
    var(--neu-shadow-dark),
    0 4px 0 var(--border-medium);
}

.btn-secondary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow:
    var(--neu-shadow-light),
    var(--neu-shadow-dark),
    0 6px 0 var(--border-medium);
}

.btn-secondary:active:not(:disabled) {
  transform: translateY(3px);
  box-shadow:
    var(--neu-inset-light),
    var(--neu-inset-dark);
}

/* Danger */
.btn-danger {
  background: linear-gradient(135deg, #ff4757, #ff6b81);
  color: white;
  box-shadow:
    0 var(--btn-bottom-depth) 0 #c0392b,
    0 8px 20px rgba(255, 71, 87, 0.4);
}

.btn-danger:hover:not(:disabled) {
  transform: translateY(-3px);
  box-shadow:
    0 calc(var(--btn-bottom-depth) + 3px) 0 #c0392b,
    0 14px 28px rgba(255, 71, 87, 0.5);
}

.btn-danger:active:not(:disabled) {
  transform: translateY(var(--btn-bottom-depth));
  box-shadow: 0 0 0 #c0392b;
}

/* Success */
.btn-success {
  background: linear-gradient(135deg, #00c875, #00a8cc);
  color: white;
  box-shadow:
    0 var(--btn-bottom-depth) 0 #007a4d,
    0 8px 20px rgba(0, 200, 117, 0.4);
}

.btn-success:hover:not(:disabled) {
  transform: translateY(-3px);
  box-shadow:
    0 calc(var(--btn-bottom-depth) + 3px) 0 #007a4d,
    0 14px 28px rgba(0, 200, 117, 0.5);
}

.btn-success:active:not(:disabled) {
  transform: translateY(var(--btn-bottom-depth));
  box-shadow: 0 0 0 #007a4d;
}

/* Disabled state */
.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  filter: grayscale(30%);
  transform: none !important;
}

/* Full-width variant */
.btn-block {
  width: 100%;
}

/* Size variants */
.btn-sm {
  padding: 10px 22px;
  font-size: 0.8rem;
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 20px 48px;
  font-size: 1rem;
  border-radius: var(--radius-lg);
  --btn-bottom-depth: 6px;
}

/* Controls section */
.controls {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
    margin: 50px 0;
}

/* Control Cards - Neumorphic Design */
.control-group {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  border: 1px solid var(--border-subtle);
  box-shadow: var(--neu-shadow-light), var(--neu-shadow-dark);
  position: relative;
  overflow: hidden;
  transition: box-shadow var(--transition);
}

/* Accent top border */
.control-group::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-brand);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.control-group:hover {
  box-shadow:
    var(--neu-shadow-light),
    8px 8px 20px rgba(0,0,0,0.15);
}

.control-label {
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.control-value {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 800;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1;
  margin-bottom: 16px;
}


.slider::-moz-range-thumb:hover {
    transform: scale(1.1);
}

.value-display {
    text-align: center;
    margin-top: 15px;
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--accent-1);
    background: var(--bg-tertiary);
    padding: 12px 20px;
    border-radius: var(--radius-md);
    display: inline-block;
    box-shadow: var(--neu-inset-light), var(--neu-inset-dark);
}

/* Enhanced Progress bar */
.progress-container {
    margin: 40px 0;
    display: none;
}

/* Enhanced Progress Bar */
.progress-bar {
  height: 16px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
  box-shadow: var(--neu-inset-dark);
  margin: 8px 0;
}

.progress-fill {
  height: 100%;
  background: var(--gradient-brand);
  border-radius: var(--radius-full);
  transition: width 0.3s ease-out;
  position: relative;
  overflow: hidden;
}

.progress-fill::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255,255,255,0.35) 50%,
    transparent 100%
  );
  animation: shimmer 1.4s linear infinite;
  transform: translateX(-100%);
}

@keyframes shimmer {
  to { transform: translateX(200%); }
}
    /* Progress timer and value display */
.progress-timer {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--text-primary);
    font-weight: 700;
    font-size: 1.1rem;
    z-index: 1;
}

/* Success message */
.success-message {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: white;
    padding: 25px 35px;
    border-radius: var(--radius-lg);
    margin: 25px 0;
    font-weight: 700;
    text-align: center;
    box-shadow: 
        0 12px 24px rgba(0,0,0,0.15),
        var(--neu-shadow-light), var(--neu-shadow-dark);
    animation: slideInUp 0.5s var(--transition);
    display: none;
}

/* Image preview */
.preview-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 35px;
    margin: 50px 0;
}

.preview-box {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: 30px;
    border: 1px solid var(--border-medium);
    box-shadow: 
        var(--neu-shadow-light), var(--neu-shadow-dark),
        inset 0 6px 12px rgba(0, 0, 0, 0.08);
}

.preview-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 20px;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.preview-image {
    width: 100%;
    max-height: 350px;
    object-fit: contain;
    border-radius: var(--radius-lg);
    margin-bottom: 20px;
    box-shadow: 0 6px 12px rgba(0,0,0,0.08);
}

.file-info {
    text-align: center;
    color: var(--text-secondary);
}

.file-size {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--accent-1);
    margin-bottom: 8px;
}

.compression-ratio {
    margin-top: 12px;
    color: var(--accent-2);
    font-weight: 700;
    font-size: 1rem;
}

/* Ad placeholder */
.ad-placeholder {
    background: var(--bg-secondary);
    border: 2px dashed var(--border-subtle);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 280px;
    margin: 40px 0;
    position: relative;
    transition: all var(--transition);
}

.ad-placeholder:hover {
    border-color: var(--accent-1);
    background: var(--bg-tertiary);
}

.ad-label {
    position: absolute;
    top: 15px;
    left: 15px;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 700;
    box-shadow: 0 3px 6px rgba(0,0,0,0.08);
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-medium);
    padding: 50px 0;
    margin-top: 60px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 35px;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 30px;
}

.footer-section h3 {
    color: var(--text-primary);
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: all var(--transition);
    padding: 12px 16px;
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    border: 1px solid var(--border-medium);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 10px;
}

.footer-links a:hover {
    color: var(--accent-1);
    background: var(--bg-tertiary);
    transform: translateX(8px);
    box-shadow: var(--neu-shadow-light), var(--neu-shadow-dark);
}

.footer-links a[aria-disabled="true"] {
    opacity: 0.5;
    cursor: not-allowed;
}

.footer-links a[aria-disabled="true"]:hover {
    transform: none;
    box-shadow: none;
}

/* Animations */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 20px;
    }
    
    .header h1 {
        font-size: 2.2rem;
    }
    
    .main-content {
        padding: 40px 25px;
    }
    
    .controls {
        grid-template-columns: 1fr;
        gap: 25px;
    }
    
    .preview-container {
        grid-template-columns: 1fr;
        gap: 25px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 25px;
    }
    
    .btn {
        padding: 16px 32px;
        font-size: 1rem;
    }
    
    .upload-area {
        padding: 50px 25px;
    }
    
    .about-features {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .logo {
        font-size: 2.8rem;
    }
    
    .theme-toggle {
        top: 15px;
        right: 15px;
    }
}

/* Loading spinner */
.spinner {
    border: 4px solid var(--border-subtle);
    border-top: 4px solid var(--accent-1);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
    margin: 25px auto;
}

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

.hidden {
    display: none;
}

/* Enhanced Accessibility Features */
.btn[aria-busy="true"] {
    opacity: 0.7;
    cursor: not-allowed;
}

.progress-bar[role="progressbar"] {
    border: 2px solid var(--border-medium);
}

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

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --border-primary: #000000;
        --border-secondary: #333333;
        --text-secondary: #000000;
        --text-tertiary: #333333;
    }
}

/* Print styles */
@media print {
    .theme-toggle,
    .toast-container,
    .btn,
    .controls {
        display: none !important;
    }
    
    .main-content {
        box-shadow: none !important;
        border: 1px solid #ccc !important;
    }
}

/* Modal System */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 0;
    transition: var(--transition);
}

.modal-overlay.active {
    opacity: 1;
}

.modal-box {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    max-width: 800px;
    width: 90%;
    max-height: 85vh;
    overflow-y: auto;
    padding: 40px;
    position: relative;
    border: 1px solid var(--border-medium);
    box-shadow: var(--shadow-medium);
    transform: scale(0.9);
    opacity: 0;
    transition: var(--transition);
}

.modal-overlay.active .modal-box {
    transform: scale(1);
    opacity: 1;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-secondary);
}

.modal-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 20px;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-tertiary);
    background: none;
    border: none;
    padding: 8px;
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}

.modal-close:hover {
    color: var(--text-primary);
    transform: scale(1.1);
}

.modal-content {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 20px;
}

.modal-content h3 {
    color: var(--text-primary);
    font-size: 1.2rem;
    margin: 20px 0 10px 0;
}

.modal-content ul {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-left: 20px;
    margin-bottom: 15px;
}

.modal-content li {
    margin-bottom: 8px;
}

.modal-content p {
    margin-bottom: 15px;
}

/* Modal scrollbar styling */
.modal-box::-webkit-scrollbar {
    width: 8px;
}

.modal-box::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: 4px;
}

.modal-box::-webkit-scrollbar-thumb {
    background: var(--accent-primary);
    border-radius: 4px;
}

/* Shared Header */
.site-header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-primary);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(8px);
}

.nav-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 12px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--text-primary);
    transition: var(--transition);
}

.nav-logo:hover {
    color: var(--accent-1);
}

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

/* Shared Footer */
.site-footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-primary);
    margin-top: 60px;
}

.footer-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 24px 20px;
    text-align: center;
}

.footer-inner p {
    color: var(--text-secondary);
    margin: 0 0 12px 0;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--accent-1);
}

/* Button styles */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border-radius: 6px;
    font-weight: 600;
    font-size: 0.9rem;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.85rem;
}

.btn-lg {
    padding: 12px 24px;
    font-size: 1rem;
}

.btn-primary {
    background: var(--gradient-brand);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-medium);
}

.btn-secondary {
    background: var(--gradient-subtle);
    color: var(--text-primary);
    border: 1px solid var(--border-primary);
}

.btn-secondary:hover {
    background: var(--gradient-accent);
    color: white;
    border-color: transparent;
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
}

.btn-ghost:hover {
    color: var(--accent-1);
    background: var(--bg-secondary);
}

/* Ad Slots */
.ad-slot { width: 100%; min-height: 90px; margin: 20px 0; background: transparent; }
.ad-sidebar { position: fixed; right: 0; top: 50%; transform: translateY(-50%); width: 160px; z-index: 100; }
@media (max-width: 1200px) { .ad-sidebar { display: none; } }

/* Tools Grid */
.tools-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 16px; }
.tool-card { background: var(--bg-secondary); border: 1px solid var(--border-primary); border-radius: 12px; padding: 20px; transition: var(--transition); }
.tool-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-medium); border-color: var(--accent-1); }
.tool-card-icon { font-size: 1.8rem; color: var(--accent-1); margin-bottom: 10px; }
.tool-card-title { font-weight: 700; font-size: 1rem; margin: 0 0 6px; }
.tool-card-desc { color: var(--text-secondary); font-size: 0.85rem; margin: 0 0 14px; line-height: 1.5; }
.category-section { margin-bottom: 48px; }
.category-title { font-size: 1.4rem; font-weight: 800; margin-bottom: 20px; display: flex; align-items: center; gap: 10px; }

/* Tool Hero */
.tool-hero { text-align: center; padding: 40px 20px 20px; }
.tool-hero-icon { font-size: 3rem; color: var(--accent-1); margin-bottom: 12px; }
.tool-hero-title { font-size: 2rem; font-weight: 800; margin: 0 0 8px; }
.tool-hero-subtitle { color: var(--text-secondary); font-size: 1.1rem; margin: 0; }

/* Tool Main */
.tool-main { max-width: 860px; margin: 0 auto; padding: 0 20px 60px; }

/* Tools Section */
.tools-section { max-width: 1200px; margin: 0 auto; padding: 40px 20px; }
.category-title { color: var(--text-primary); font-size: 1.8rem; font-weight: 800; margin-bottom: 24px; display: flex; align-items: center; gap: 12px; }
.category-title i { color: var(--accent-1); }

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .upload-icon {
        animation: none;
    }
    
    .progress-fill::before {
        animation: none;
    }
}

/* ============================================================
   AD OVERLAY FIX — prevents ad scripts from blocking page
   ============================================================ */

#aclib-in-page-push,
[id^="ac-"],
[class^="ac-"],
[id*="aclib"],
[class*="aclib"],
[id*="adcash"],
[id*="push-notification"],
[class*="push-notification"],
body > div[style*="position: fixed"],
body > div[style*="position:fixed"] {
    pointer-events: none !important;
    z-index: auto !important;
}

.container div[style*="text-align:center"] iframe,
.container div[style*="text-align:center"] > * {
    pointer-events: auto !important;
}

.modal-overlay,
#toastContainer {
    z-index: 9999 !important;
    pointer-events: auto !important;
}

.site-header,
.nav-inner,
.btn,
a,
button,
input,
select,
textarea,
.tool-card,
.upload-area {
    position: relative;
    z-index: 1;
    pointer-events: auto !important;
}