/* ═══════════════════════════════════════════════════════════════════════════
   EcoTrack — Carbon Footprint Platform · Global Design System
   Premium glassmorphism dark-mode design with WCAG 2.1 AA compliance
   ═══════════════════════════════════════════════════════════════════════════ */

/* ── 1. Design Tokens ─────────────────────────────────────────────────────── */
:root {
  /* Colors */
  --color-bg-primary:      #050d05;
  --color-bg-secondary:    #0d1a0d;
  --color-bg-card:         rgba(255, 255, 255, 0.04);
  --color-glass-border:    rgba(255, 255, 255, 0.09);
  --color-glass-shadow:    rgba(0, 0, 0, 0.5);

  --color-accent-green:    #4ade80;
  --color-accent-teal:     #22d3ee;
  --color-accent-yellow:   #fbbf24;
  --color-accent-red:      #f87171;
  --color-accent-purple:   #c084fc;
  --color-accent-blue:     #60a5fa;

  --color-text-primary:    #f0fdf4;
  --color-text-secondary:  rgba(240, 253, 244, 0.70);
  --color-text-muted:      rgba(240, 253, 244, 0.40);
  --color-text-accent:     #4ade80;

  /* Gradients */
  --gradient-hero:         linear-gradient(135deg, #0a1f0a 0%, #0d2a1a 50%, #091a1a 100%);
  --gradient-green:        linear-gradient(135deg, #4ade80, #22d3ee);
  --gradient-card:         linear-gradient(135deg, rgba(255,255,255,0.05) 0%, rgba(255,255,255,0.02) 100%);
  --gradient-glow-green:   radial-gradient(circle at center, rgba(74,222,128,0.15) 0%, transparent 70%);

  /* Typography */
  --font-heading:   'Outfit', 'Inter', system-ui, sans-serif;
  --font-body:      'Inter', system-ui, -apple-system, sans-serif;

  --text-xs:    0.75rem;
  --text-sm:    0.875rem;
  --text-base:  1rem;
  --text-lg:    1.125rem;
  --text-xl:    1.25rem;
  --text-2xl:   1.5rem;
  --text-3xl:   1.875rem;
  --text-4xl:   2.25rem;
  --text-5xl:   3rem;

  /* Spacing */
  --space-1:   0.25rem;
  --space-2:   0.5rem;
  --space-3:   0.75rem;
  --space-4:   1rem;
  --space-5:   1.25rem;
  --space-6:   1.5rem;
  --space-8:   2rem;
  --space-10:  2.5rem;
  --space-12:  3rem;
  --space-16:  4rem;
  --space-20:  5rem;

  /* Borders & Radius */
  --radius-sm:   0.375rem;
  --radius-md:   0.75rem;
  --radius-lg:   1.25rem;
  --radius-xl:   1.75rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-card:    0 4px 24px rgba(0,0,0,0.4), 0 1px 0 rgba(255,255,255,0.06) inset;
  --shadow-glow:    0 0 30px rgba(74,222,128,0.15);
  --shadow-hover:   0 8px 40px rgba(0,0,0,0.5), 0 0 20px rgba(74,222,128,0.1);

  /* Transitions */
  --transition-fast:   150ms ease;
  --transition-base:   250ms ease;
  --transition-slow:   400ms ease;

  /* Header height */
  --header-h: 64px;
}

/* Light theme overrides */
.light-theme {
  --color-bg-primary:     #f0fdf4;
  --color-bg-secondary:   #dcfce7;
  --color-bg-card:        rgba(0, 0, 0, 0.03);
  --color-glass-border:   rgba(0, 0, 0, 0.08);
  --color-glass-shadow:   rgba(0, 0, 0, 0.15);
  --color-text-primary:   #052e16;
  --color-text-secondary: rgba(5, 46, 22, 0.70);
  --color-text-muted:     rgba(5, 46, 22, 0.40);
  --gradient-hero:        linear-gradient(135deg, #dcfce7 0%, #d1fae5 50%, #ecfdf5 100%);
  --color-bg-card:        rgba(255,255,255,0.60);
  --shadow-card:          0 4px 24px rgba(0,0,0,0.08), 0 1px 0 rgba(255,255,255,0.8) inset;
}

/* ── 2. Reset & Base ──────────────────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text-primary);
  background: var(--color-bg-primary);
  background-image: var(--gradient-hero);
  background-attachment: fixed;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ── 3. Accessibility ─────────────────────────────────────────────────────── */

/* Skip link */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  background: var(--color-accent-green);
  color: #052e16;
  font-weight: 700;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  text-decoration: none;
  z-index: 10000;
  transition: top var(--transition-fast);
}
.skip-link:focus {
  top: var(--space-4);
  outline: 3px solid #052e16;
  outline-offset: 2px;
}

/* Focus styles — WCAG 2.1 AA */
:focus-visible {
  outline: 2px solid var(--color-accent-teal);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .particle-canvas { display: none; }
}

/* High contrast text */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* ── 4. Backgrounds ───────────────────────────────────────────────────────── */
.particle-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.6;
}

.confetti-canvas {
  position: fixed;
  inset: 0;
  z-index: 9999;
  pointer-events: none;
}

/* ── 5. Header ────────────────────────────────────────────────────────────── */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(5, 13, 5, 0.85);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--color-glass-border);
  box-shadow: 0 4px 30px rgba(0,0,0,0.3);
}

.header-inner {
  max-width: 1400px;
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  gap: var(--space-6);
  padding: 0 var(--space-6);
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  flex-shrink: 0;
}
.logo-icon { font-size: 1.5rem; filter: drop-shadow(0 0 8px rgba(74,222,128,0.6)); }
.logo-text  {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
}
.logo-accent { color: var(--color-accent-green); }

/* Nav */
.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  flex: 1;
  justify-content: center;
}

.nav-tab {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: var(--space-2) var(--space-3);
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  min-width: 56px;
}
.nav-tab:hover {
  color: var(--color-text-primary);
  background: rgba(255,255,255,0.06);
}
.nav-tab-active {
  color: var(--color-accent-green);
  background: rgba(74, 222, 128, 0.1);
}
.nav-icon { font-size: 1.1rem; line-height: 1; }
.nav-label { font-size: 0.7rem; font-weight: 600; letter-spacing: 0.02em; }

/* Header controls */
.header-controls { display: flex; gap: var(--space-2); flex-shrink: 0; }
.icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 1rem;
  transition: all var(--transition-fast);
  color: var(--color-text-secondary);
}
.icon-btn:hover { background: rgba(255,255,255,0.12); border-color: rgba(255,255,255,0.2); }
.icon-btn-danger:hover { background: rgba(248,113,113,0.15); border-color: rgba(248,113,113,0.4); }

/* ── 6. Main Content & Page Sections ──────────────────────────────────────── */
.main-content {
  position: relative;
  z-index: 1;
  min-height: calc(100vh - var(--header-h) - 80px);
}

.page-section {
  display: none;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}
.page-active {
  display: block;
  opacity: 1;
  transform: translateY(0);
  animation: pageIn var(--transition-slow) ease forwards;
}
@keyframes pageIn {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Page layout wrappers */
.page-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: var(--space-8) var(--space-6);
}

.page-header {
  text-align: center;
  margin-bottom: var(--space-10);
}
.page-title {
  font-family: var(--font-heading);
  font-size: var(--text-4xl);
  font-weight: 800;
  color: var(--color-text-primary);
  line-height: 1.2;
  margin-bottom: var(--space-3);
  background: var(--gradient-green);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.page-subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ── 7. Glass Cards ───────────────────────────────────────────────────────── */
.glass-card {
  background: var(--color-bg-card);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}
.glass-card:hover {
  box-shadow: var(--shadow-hover);
}

/* ── 8. Buttons ───────────────────────────────────────────────────────────── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  background: var(--gradient-green);
  color: #052e16;
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 700;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
  box-shadow: 0 4px 15px rgba(74,222,128,0.3);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(74,222,128,0.4);
  filter: brightness(1.05);
}
.btn-primary:active { transform: translateY(0); }
.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  background: transparent;
  color: var(--color-text-secondary);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 600;
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}
.btn-ghost:hover {
  background: rgba(255,255,255,0.07);
  color: var(--color-text-primary);
  border-color: rgba(255,255,255,0.2);
}
.btn-ghost:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.btn-large {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-lg);
}

/* ── 9. Hero Section ──────────────────────────────────────────────────────── */
.hero {
  max-width: 1300px;
  margin: 0 auto;
  padding: var(--space-16) var(--space-6) var(--space-12);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: rgba(74, 222, 128, 0.12);
  border: 1px solid rgba(74, 222, 128, 0.3);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-accent-green);
  margin-bottom: var(--space-6);
  animation: fadeInDown 0.6s ease forwards;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.15;
  color: var(--color-text-primary);
  margin-bottom: var(--space-6);
  animation: fadeInUp 0.7s ease 0.1s both;
}

.gradient-text {
  background: var(--gradient-green);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  max-width: 520px;
  line-height: 1.7;
  margin-bottom: var(--space-8);
  animation: fadeInUp 0.7s ease 0.2s both;
}

.hero-actions {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
  animation: fadeInUp 0.7s ease 0.3s both;
}

/* Earth illustration */
.hero-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fadeIn 1s ease 0.4s both;
}

.earth-container {
  position: relative;
  width: 320px;
  height: 320px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.earth-glow {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle, rgba(74,222,128,0.2) 0%, rgba(34,211,238,0.1) 50%, transparent 70%);
  border-radius: 50%;
  animation: pulse 4s ease-in-out infinite;
}

.earth-emoji {
  font-size: 9rem;
  filter: drop-shadow(0 0 30px rgba(74,222,128,0.4));
  animation: earthRotate 20s linear infinite;
  z-index: 2;
}

/* Orbiting elements */
.orbit {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  animation: orbit var(--orbit-duration, 8s) linear infinite;
}
.orbit-1 {
  width: 200px; height: 200px;
  --orbit-duration: 6s;
  left: 50%; top: 50%;
  margin-left: -100px; margin-top: -100px;
  border: 1px solid rgba(74,222,128,0.2);
}
.orbit-2 {
  width: 270px; height: 270px;
  --orbit-duration: 10s;
  left: 50%; top: 50%;
  margin-left: -135px; margin-top: -135px;
  border: 1px solid rgba(34,211,238,0.15);
  animation-direction: reverse;
}
.orbit-3 {
  width: 320px; height: 320px;
  --orbit-duration: 14s;
  left: 50%; top: 50%;
  margin-left: -160px; margin-top: -160px;
  border: 1px solid rgba(251,191,36,0.1);
}
.orbit-dot {
  position: absolute;
  top: -10px;
  left: 50%;
  margin-left: -10px;
  font-size: 1.4rem;
  animation: orbitCounter var(--orbit-duration, 8s) linear infinite;
  animation-delay: var(--delay, 0s);
}
@keyframes orbit { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
@keyframes orbitCounter { from { transform: rotate(0deg); } to { transform: rotate(-360deg); } }
@keyframes earthRotate { from { transform: rotate(-3deg); } 50% { transform: rotate(3deg); } to { transform: rotate(-3deg); } }
@keyframes pulse { 0%,100% { transform: scale(1); opacity: 0.7; } 50% { transform: scale(1.08); opacity: 1; } }

/* ── 10. Stats Section ────────────────────────────────────────────────────── */
.stats-section {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 var(--space-6) var(--space-16);
}

.section-title {
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  font-weight: 700;
  text-align: center;
  margin-bottom: var(--space-10);
  background: var(--gradient-green);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  text-align: center;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-8);
  font-size: var(--text-lg);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

.stat-card {
  background: var(--color-bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  text-align: center;
  box-shadow: var(--shadow-card);
  transition: all var(--transition-base);
}
.stat-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.stat-card-highlight {
  background: rgba(74, 222, 128, 0.06);
  border-color: rgba(74, 222, 128, 0.25);
  box-shadow: 0 4px 24px rgba(74,222,128,0.15);
}
.stat-icon { font-size: 2.5rem; margin-bottom: var(--space-4); }
.stat-number {
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  font-weight: 800;
  color: var(--color-accent-green);
  margin-bottom: var(--space-2);
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: var(--space-2);
}
.stat-unit { font-size: var(--text-sm); font-weight: 500; color: var(--color-text-secondary); }
.stat-label { font-weight: 600; color: var(--color-text-primary); margin-bottom: var(--space-1); }
.stat-note { font-size: var(--text-xs); color: var(--color-text-muted); }

/* ── 11. How It Works ─────────────────────────────────────────────────────── */
.how-it-works {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6) var(--space-20);
}

.steps-flow {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
}

.flow-step {
  flex: 1;
  text-align: center;
  padding: var(--space-8) var(--space-4);
  background: var(--color-bg-card);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(12px);
  transition: all var(--transition-base);
}
.flow-step:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); border-color: rgba(74,222,128,0.3); }
.flow-step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: var(--gradient-green);
  color: #052e16;
  font-weight: 800;
  font-size: var(--text-sm);
  border-radius: 50%;
  margin-bottom: var(--space-3);
}
.flow-step-icon { font-size: 2.5rem; margin-bottom: var(--space-4); display: block; }
.flow-step-title { font-family: var(--font-heading); font-size: var(--text-xl); font-weight: 700; margin-bottom: var(--space-3); }
.flow-step-desc { font-size: var(--text-sm); color: var(--color-text-secondary); line-height: 1.6; }

.flow-arrow {
  font-size: 1.5rem;
  color: var(--color-text-muted);
  margin-top: var(--space-12);
  flex-shrink: 0;
}

/* ── 12. Calculator ───────────────────────────────────────────────────────── */
.calc-container {
  max-width: 780px;
  margin: 0 auto;
  padding: var(--space-8) var(--space-6) var(--space-12);
}

.calc-header { text-align: center; margin-bottom: var(--space-8); }
.calc-title {
  font-family: var(--font-heading);
  font-size: var(--text-4xl);
  font-weight: 800;
  background: var(--gradient-green);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-3);
}
.calc-subtitle { color: var(--color-text-secondary); }

/* Progress bar */
.calc-progress { margin-bottom: var(--space-8); }
.progress-track {
  height: 6px;
  background: rgba(255,255,255,0.08);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-bottom: var(--space-3);
}
.progress-fill {
  height: 100%;
  background: var(--gradient-green);
  border-radius: var(--radius-full);
  transition: width 0.4s ease;
  box-shadow: 0 0 10px rgba(74,222,128,0.5);
}
.progress-label {
  text-align: center;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
}
.step-dots {
  display: flex;
  justify-content: center;
  gap: var(--space-3);
}
.step-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255,255,255,0.15);
  transition: all var(--transition-base);
}
.step-dot-active { background: var(--color-accent-green); }
.step-dot-current {
  background: var(--color-accent-teal);
  box-shadow: 0 0 8px var(--color-accent-teal);
  transform: scale(1.3);
}

/* Step panels */
.step-panel { display: none; }
.step-panel-active { display: block; animation: fadeInUp 0.35s ease forwards; }

.step-heading {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  margin-bottom: var(--space-8);
  padding: var(--space-6);
  background: rgba(74, 222, 128, 0.05);
  border: 1px solid rgba(74, 222, 128, 0.15);
  border-radius: var(--radius-xl);
}
.step-emoji { font-size: 2.5rem; flex-shrink: 0; }
.step-title { font-family: var(--font-heading); font-size: var(--text-2xl); font-weight: 700; margin-bottom: var(--space-1); }
.step-desc { color: var(--color-text-secondary); }

/* Form grid */
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
}
.form-group-full { grid-column: 1 / -1; }

.form-group { display: flex; flex-direction: column; gap: var(--space-2); }
.form-label {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.form-label strong { color: var(--color-accent-green); font-size: var(--text-base); }
.form-hint { font-size: var(--text-xs); color: var(--color-text-muted); }
.field-error { font-size: var(--text-xs); color: var(--color-accent-red); display: none; }

.form-select {
  appearance: none;
  -webkit-appearance: none;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  padding: var(--space-3) var(--space-4);
  cursor: pointer;
  transition: border-color var(--transition-fast);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%234ade80' d='M1 1l5 5 5-5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 2rem;
}
.form-select:focus { border-color: var(--color-accent-green); outline: none; }
.form-select option { background: #0d1a0d; color: var(--color-text-primary); }

/* Range inputs */
.form-range {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  background: rgba(255,255,255,0.1);
  border-radius: var(--radius-full);
  outline: none;
  cursor: pointer;
}
.form-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  background: var(--gradient-green);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 0 8px rgba(74,222,128,0.5);
  transition: box-shadow var(--transition-fast);
}
.form-range::-webkit-slider-thumb:hover { box-shadow: 0 0 14px rgba(74,222,128,0.7); }
.form-range::-moz-range-thumb {
  width: 20px; height: 20px;
  background: var(--gradient-green);
  border-radius: 50%;
  border: none;
  cursor: pointer;
  box-shadow: 0 0 8px rgba(74,222,128,0.5);
}
.range-labels {
  display: flex;
  justify-content: space-between;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: 2px;
}

/* Checkboxes */
.form-group-checkbox { flex-direction: column; }
.checkbox-label {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  cursor: pointer;
}
.checkbox-input { position: absolute; opacity: 0; width: 0; height: 0; }
.checkbox-custom {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  background: rgba(255,255,255,0.06);
  border: 2px solid var(--color-glass-border);
  border-radius: var(--radius-sm);
  flex-shrink: 0;
  transition: all var(--transition-fast);
}
.checkbox-input:checked + .checkbox-custom {
  background: var(--color-accent-green);
  border-color: var(--color-accent-green);
}
.checkbox-input:checked + .checkbox-custom::after {
  content: '✓';
  color: #052e16;
  font-weight: 800;
  font-size: 0.75rem;
}
.checkbox-input:focus + .checkbox-custom {
  outline: 2px solid var(--color-accent-teal);
  outline-offset: 2px;
}
.checkbox-text { font-size: var(--text-sm); color: var(--color-text-secondary); }

/* Info box */
.info-box {
  display: flex;
  gap: var(--space-3);
  align-items: flex-start;
  padding: var(--space-4);
  background: rgba(96,165,250,0.08);
  border: 1px solid rgba(96,165,250,0.2);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-top: var(--space-4);
}
.info-box strong { color: var(--color-accent-blue); }

/* Diet options */
.diet-options {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--space-3);
}
.diet-option { display: contents; }
.diet-radio { position: absolute; opacity: 0; }
.diet-option-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-5) var(--space-3);
  background: var(--color-bg-card);
  border: 2px solid var(--color-glass-border);
  border-radius: var(--radius-xl);
  cursor: pointer;
  text-align: center;
  transition: all var(--transition-base);
  font-size: var(--text-sm);
}
.diet-radio:checked + .diet-option-inner {
  border-color: var(--color-accent-green);
  background: rgba(74,222,128,0.08);
  box-shadow: 0 0 16px rgba(74,222,128,0.2);
}
.diet-icon { font-size: 2rem; }
.diet-impact { font-size: var(--text-xs); font-weight: 700; padding: 2px 8px; border-radius: var(--radius-full); }
.diet-impact-high    { background: rgba(248,113,113,0.2); color: #f87171; }
.diet-impact-med     { background: rgba(251,191,36,0.2); color: #fbbf24; }
.diet-impact-low     { background: rgba(74,222,128,0.15); color: #4ade80; }
.diet-impact-lowest  { background: rgba(34,211,238,0.15); color: #22d3ee; }

/* Wizard navigation */
.calc-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: var(--space-10);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-glass-border);
}

.btn-calculate {
  background: linear-gradient(135deg, #22d3ee, #4ade80);
  font-size: var(--text-lg);
  padding: var(--space-4) var(--space-8);
  animation: pulse 2s ease infinite;
}

/* ── 13. Dashboard ────────────────────────────────────────────────────────── */
.dashboard-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-8) var(--space-6) var(--space-12);
}

.dashboard-header {
  text-align: center;
  margin-bottom: var(--space-10);
}
.dashboard-title {
  font-family: var(--font-heading);
  font-size: var(--text-4xl);
  font-weight: 800;
  background: var(--gradient-green);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-3);
}
.dashboard-message {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* Score row */
.dashboard-score-row {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-6);
  margin-bottom: var(--space-6);
}

.score-card {
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
  width: 320px;
}
.score-canvas { width: 280px; height: 280px; }
.rating-badge {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 800;
  padding: var(--space-2) var(--space-5);
  border: 2px solid;
  border-radius: var(--radius-full);
  color: var(--color-accent-green);
  border-color: rgba(74,222,128,0.3);
  letter-spacing: 0.05em;
}

/* Key stats */
.key-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  gap: var(--space-4);
}
.key-stat {
  padding: var(--space-5) var(--space-6);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--space-2);
  transition: all var(--transition-base);
}
.key-stat:hover { transform: translateY(-2px); }
.key-stat-icon { font-size: 1.5rem; }
.key-stat-value {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: 800;
  color: var(--color-text-primary);
  display: flex;
  align-items: baseline;
  gap: var(--space-1);
}
.key-stat-unit { font-size: var(--text-sm); color: var(--color-text-muted); font-weight: 400; }
.key-stat-label { font-size: var(--text-sm); color: var(--color-text-secondary); }

/* Charts row */
.charts-row {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-6);
  margin-bottom: var(--space-6);
}
.chart-card { padding: var(--space-5); }
.chart-title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 700;
  margin-bottom: var(--space-4);
  color: var(--color-text-primary);
}
.chart-canvas { width: 100%; display: block; }
.chart-canvas-bars  { height: 200px; }
.chart-canvas-donut { height: 220px; }
.chart-canvas-comparison { height: 200px; }

/* Offset section */
.offset-section {
  padding: var(--space-6);
  margin-bottom: var(--space-8);
}
.offset-grid {
  display: flex;
  gap: var(--space-10);
  justify-content: center;
  margin-top: var(--space-4);
}
.offset-item { text-align: center; }
.offset-icon { font-size: 2.5rem; display: block; margin-bottom: var(--space-2); }
.offset-value {
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  font-weight: 800;
  color: var(--color-accent-green);
  margin-bottom: var(--space-1);
}
.offset-label { font-size: var(--text-sm); color: var(--color-text-secondary); }

/* Insights */
.insights-section { margin-bottom: var(--space-8); }
.insights-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}

.insight-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-xl);
  padding: var(--space-5);
  backdrop-filter: blur(12px);
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.insight-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-hover); }
.insight-card-easy   { border-left: 3px solid var(--color-accent-green); }
.insight-card-medium { border-left: 3px solid var(--color-accent-yellow); }
.insight-card-hard   { border-left: 3px solid var(--color-accent-red); }

.insight-header { display: flex; gap: var(--space-3); align-items: flex-start; }
.insight-icon { font-size: 1.8rem; flex-shrink: 0; }
.insight-title { font-weight: 700; font-size: var(--text-base); margin-bottom: 2px; }
.insight-difficulty { font-size: var(--text-xs); color: var(--color-text-muted); }
.insight-desc { font-size: var(--text-sm); color: var(--color-text-secondary); line-height: 1.6; }
.insight-impact {
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-accent-green);
  padding: var(--space-2) var(--space-3);
  background: rgba(74,222,128,0.08);
  border-radius: var(--radius-md);
}

/* Dashboard actions */
.dashboard-actions {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  margin-top: var(--space-8);
}

/* ── 14. Actions Page ─────────────────────────────────────────────────────── */
.actions-summary {
  padding: var(--space-5) var(--space-6);
  margin-bottom: var(--space-8);
}
.actions-summary-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-4);
  flex-wrap: wrap;
  gap: var(--space-4);
}
.actions-summary-item { display: flex; align-items: center; gap: var(--space-3); }
.actions-summary-icon { font-size: 1.4rem; }
.actions-summary-text { font-size: var(--text-base); color: var(--color-text-secondary); }
.actions-summary-text strong { color: var(--color-accent-green); }

.action-category {
  margin-bottom: var(--space-8);
}
.action-category-title {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-accent-green);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-glass-border);
}
.action-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.action-item {
  background: var(--color-bg-card);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-xl);
  transition: all var(--transition-base);
}
.action-item:hover { border-color: rgba(74,222,128,0.3); }
.action-item-done {
  background: rgba(74,222,128,0.06);
  border-color: rgba(74,222,128,0.3);
}
.action-label {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-5);
  cursor: pointer;
}
.action-checkbox {
  width: 22px;
  height: 22px;
  border-radius: var(--radius-sm);
  border: 2px solid var(--color-glass-border);
  appearance: none;
  -webkit-appearance: none;
  flex-shrink: 0;
  cursor: pointer;
  transition: all var(--transition-fast);
  background: transparent;
  position: relative;
}
.action-checkbox:checked {
  background: var(--color-accent-green);
  border-color: var(--color-accent-green);
}
.action-checkbox:checked::after {
  content: '✓';
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #052e16;
  font-weight: 800;
  font-size: 13px;
}
.action-checkbox:focus { outline: 2px solid var(--color-accent-teal); outline-offset: 2px; }
.action-text { display: flex; flex-direction: column; gap: 2px; }
.action-title { font-weight: 600; font-size: var(--text-sm); }
.action-item-done .action-title { text-decoration: line-through; color: var(--color-text-muted); }
.action-saving { font-size: var(--text-xs); color: var(--color-accent-green); }

/* ── 15. Progress Page ────────────────────────────────────────────────────── */
.progress-stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}
.progress-stat {
  padding: var(--space-5);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
}
.progress-stat-icon { font-size: 1.5rem; }
.progress-stat-value {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: 800;
  color: var(--color-accent-green);
  display: flex;
  align-items: baseline;
  gap: var(--space-1);
}
.progress-stat-unit { font-size: var(--text-sm); color: var(--color-text-muted); font-weight: 400; }
.progress-stat-label { font-size: var(--text-sm); color: var(--color-text-secondary); }

/* Table */
.table-container { overflow-x: auto; border-radius: var(--radius-lg); }
.history-table { width: 100%; border-collapse: collapse; }
.table-header {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-glass-border);
  text-align: left;
}
.table-cell {
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  border-bottom: 1px solid rgba(255,255,255,0.04);
}
.table-row-even { background: rgba(255,255,255,0.01); }
.table-row-odd  { background: transparent; }

/* Empty state */
.empty-state {
  text-align: center;
  padding: var(--space-20) var(--space-6);
}
.empty-icon { font-size: 4rem; margin-bottom: var(--space-6); display: block; }
.empty-title { font-family: var(--font-heading); font-size: var(--text-2xl); font-weight: 700; margin-bottom: var(--space-4); }
.empty-desc { color: var(--color-text-secondary); margin-bottom: var(--space-6); max-width: 400px; margin-left: auto; margin-right: auto; }

/* ── 16. Badges Page ──────────────────────────────────────────────────────── */
.badges-progress {
  padding: var(--space-5) var(--space-6);
  margin-bottom: var(--space-5);
}
.badges-progress-text { margin-bottom: var(--space-3); color: var(--color-text-secondary); }

.rarity-legend {
  display: flex;
  gap: var(--space-6);
  justify-content: center;
  margin-bottom: var(--space-8);
  flex-wrap: wrap;
}
.rarity-item { font-size: var(--text-sm); font-weight: 600; }
.rarity-common    { color: #4ade80; }
.rarity-uncommon  { color: #60a5fa; }
.rarity-rare      { color: #c084fc; }
.rarity-legendary { color: #fbbf24; }

.badges-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: var(--space-4);
}

.badge-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-xl);
  padding: var(--space-5);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
}
.badge-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.badge-locked { opacity: 0.4; filter: grayscale(0.6); }
.badge-earned { opacity: 1; }
.badge-icon { font-size: 2.5rem; }
.badge-name { font-weight: 700; font-size: var(--text-sm); }
.badge-rarity { font-size: var(--text-xs); font-weight: 600; }
.badge-desc { font-size: var(--text-xs); color: var(--color-text-muted); line-height: 1.5; }
.badge-earned-date { font-size: 0.65rem; color: var(--color-text-muted); }

/* ── 17. Modal ────────────────────────────────────────────────────────────── */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.75);
  backdrop-filter: blur(6px);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
}
.modal-open { display: flex; animation: fadeIn 0.2s ease; }
.modal-box {
  max-width: 400px;
  width: 100%;
  padding: var(--space-8);
  text-align: center;
  position: relative;
}
.modal-close-btn {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  background: rgba(255,255,255,0.08);
  border: none;
  color: var(--color-text-secondary);
  font-size: 1.3rem;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  cursor: pointer;
  transition: all var(--transition-fast);
}
.modal-close-btn:hover { background: rgba(255,255,255,0.15); }
.modal-badge-icon { font-size: 4rem; display: block; margin-bottom: var(--space-4); }
.modal-badge-name { font-family: var(--font-heading); font-size: var(--text-2xl); font-weight: 700; margin-bottom: var(--space-2); }
.modal-badge-rarity { font-size: var(--text-sm); color: var(--color-text-muted); text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: var(--space-4); }
.modal-badge-desc { color: var(--color-text-secondary); margin-bottom: var(--space-4); line-height: 1.6; }
.modal-badge-status { font-size: var(--text-lg); font-weight: 700; }

/* ── 18. Toast Notifications ──────────────────────────────────────────────── */
.toast-container {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  max-width: 380px;
}

.toast {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(20px);
  border: 1px solid var(--color-glass-border);
  box-shadow: 0 8px 32px rgba(0,0,0,0.5);
  animation: slideInRight 0.3s ease;
  transition: opacity 0.3s ease, transform 0.3s ease;
}
.toast-info    { background: rgba(96,165,250,0.15); border-color: rgba(96,165,250,0.3); }
.toast-success { background: rgba(74,222,128,0.15); border-color: rgba(74,222,128,0.3); }
.toast-error   { background: rgba(248,113,113,0.15); border-color: rgba(248,113,113,0.3); }
.toast-badge   {
  background: rgba(251,191,36,0.15);
  border-color: rgba(251,191,36,0.4);
  box-shadow: 0 8px 32px rgba(251,191,36,0.2);
}
.toast-fade-out { opacity: 0; transform: translateX(20px); }
.toast-badge-icon { font-size: 2rem; flex-shrink: 0; }
.toast-close {
  margin-left: auto;
  background: transparent;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  font-size: 1.1rem;
  padding: 0 var(--space-1);
  flex-shrink: 0;
}
.toast-close:hover { color: var(--color-text-primary); }

/* ── 19. Footer ───────────────────────────────────────────────────────────── */
.app-footer {
  border-top: 1px solid var(--color-glass-border);
  padding: var(--space-6) var(--space-6);
  text-align: center;
  position: relative;
  z-index: 1;
}
.footer-inner { max-width: 900px; margin: 0 auto; }
.footer-text { font-size: var(--text-sm); color: var(--color-text-muted); margin-bottom: var(--space-2); }
.footer-note { font-size: var(--text-xs); }
.footer-link { color: var(--color-accent-teal); text-decoration: none; }
.footer-link:hover { text-decoration: underline; }

/* ── 20. Animations ───────────────────────────────────────────────────────── */
@keyframes fadeIn        { from { opacity: 0; } to { opacity: 1; } }
@keyframes fadeInUp      { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeInDown    { from { opacity: 0; transform: translateY(-20px); } to { opacity: 1; transform: translateY(0); } }
@keyframes slideInRight  { from { opacity: 0; transform: translateX(30px); } to { opacity: 1; transform: translateX(0); } }

/* ── 21. Responsive ───────────────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .charts-row { grid-template-columns: 1fr 1fr; }
  .charts-row .chart-card:last-child { grid-column: 1 / -1; }
  .dashboard-score-row { grid-template-columns: 1fr; }
  .score-card { width: 100%; }
  .hero { grid-template-columns: 1fr; gap: var(--space-8); padding-top: var(--space-10); }
  .hero-visual { display: none; }
  .diet-options { grid-template-columns: repeat(3, 1fr); }
  .steps-flow { flex-wrap: wrap; }
  .flow-arrow { display: none; }
  .flow-step { flex: 1 1 calc(50% - 1rem); }
  .stats-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .header-inner { padding: 0 var(--space-4); gap: var(--space-3); }
  .logo-text { display: none; }
  .main-nav { gap: 0; }
  .nav-tab { padding: var(--space-2); min-width: 44px; }
  .nav-label { display: none; }
  .nav-icon { font-size: 1.2rem; }

  .form-grid { grid-template-columns: 1fr; }
  .diet-options { grid-template-columns: 1fr 1fr; }
  .insights-grid { grid-template-columns: 1fr; }
  .charts-row { grid-template-columns: 1fr; }
  .progress-stats-grid { grid-template-columns: 1fr 1fr; }
  .hero-title { font-size: var(--text-3xl); }
  .calc-nav { flex-wrap: wrap; gap: var(--space-3); }
  .stats-grid { grid-template-columns: 1fr; }
  .key-stats { grid-template-columns: 1fr 1fr; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn-primary,
  .hero-actions .btn-ghost { width: 100%; justify-content: center; }
}

@media (max-width: 480px) {
  .diet-options { grid-template-columns: 1fr; }
  .badges-grid  { grid-template-columns: repeat(2, 1fr); }
  .progress-stats-grid { grid-template-columns: 1fr 1fr; }
  .key-stats { grid-template-columns: 1fr; }
  .toast-container { left: var(--space-4); right: var(--space-4); max-width: none; }
  .steps-flow { flex-direction: column; }
  .flow-step { flex: unset; width: 100%; }
}

/* ── 22. Print Styles ─────────────────────────────────────────────────────── */
@media print {
  .app-header, .particle-canvas, .confetti-canvas,
  .toast-container, .modal-overlay, .app-footer,
  .hero-visual, .calc-nav, .dashboard-actions { display: none !important; }
  body { background: white; color: black; }
  .glass-card { border: 1px solid #ccc; background: white; }
}