/* ==========================================================================
   SMART WASTE SORTER AI — MINIMALIST APPLE-INSPIRED DESIGN SYSTEM
   Clean White Background, Subtle Gray Sections, Black Typography, Muted Green Accents
   Mobile-First Responsive Design (320px, 375px, 390px, 430px, 768px, 1024px, 1440px)
   ========================================================================== */

:root {
  /* Colors */
  --bg-white: #FFFFFF;
  --bg-gray: #F5F5F7;
  --bg-gray-subtle: #FBFBFD;
  --border-color: rgba(0, 0, 0, 0.08);
  --border-color-strong: rgba(0, 0, 0, 0.14);

  --text-primary: #1D1D1F;
  --text-secondary: #6E6E73;
  --text-tertiary: #86868B;

  /* Muted Environmental Green Accents */
  --accent-green: #2D6A4F;
  --accent-green-hover: #1B4332;
  --accent-green-light: #E8F5E9;
  --accent-green-border: rgba(45, 106, 79, 0.25);

  /* Semantic Waste Colors */
  --color-battery: #DC2626;
  --color-plastic: #D97706;
  --color-cardboard: #2563EB;
  --color-glass: #059669;
  --color-metal: #B45309;
  --color-paper: #3B82F6;
  --color-organic: #65A30D;
  --color-vegetation: #15803D;
  --color-textile: #7C3AED;
  --color-trash: #64748B;

  /* Typography */
  --font-system: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Inter", "Segoe UI", Roboto, sans-serif;
  --font-mono: "SF Mono", Menlo, Monaco, Consolas, "Liberation Mono", monospace;

  /* Radii */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-pill: 9999px;

  /* Shadows */
  --shadow-subtle: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-card: 0 4px 16px rgba(0, 0, 0, 0.05);
  --shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.08);

  /* Transitions */
  --ease-apple: cubic-bezier(0.16, 1, 0.3, 1);
  --transition: all 0.2s var(--ease-apple);

  /* Dimensions */
  --nav-height: 58px;
  --tap-target-min: 44px;
}

/* ==========================================================================
   RESET & FOUNDATIONS (ZERO HORIZONTAL OVERFLOW DEFENSE)
   ========================================================================== */

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  width: 100%;
  max-width: 100%;
  overflow-x: hidden;
  overflow-wrap: anywhere;
  background-color: var(--bg-white);
  color: var(--text-primary);
  font-family: var(--font-system);
  line-height: 1.55;
  margin: 0;
  padding: 0;
}

body.menu-open {
  overflow: hidden;
  touch-action: none;
}

img,
video,
canvas,
svg {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
  -webkit-tap-highlight-color: transparent;
}

button,
input,
select,
textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  -webkit-tap-highlight-color: transparent;
}

button:focus-visible,
a:focus-visible,
select:focus-visible,
input:focus-visible {
  outline: 2px solid var(--accent-green);
  outline-offset: 2px;
}

.hidden {
  display: none !important;
}

/* Fluid responsive container */
.container {
  width: 100%;
  max-width: 1140px;
  margin-inline: auto;
  padding: 0 1rem;
}

@media (max-width: 380px) {
  .container {
    padding: 0 0.75rem;
  }
  .nav-brand {
    font-size: 0.86rem;
    max-width: calc(100% - 48px);
  }
  .hero-highlights {
    padding: 0.85rem;
    gap: 0.6rem 0.5rem;
  }
  .highlight-value {
    font-size: 1.15rem;
  }
  .highlight-label {
    font-size: 0.68rem;
  }
}

@media (min-width: 768px) {
  .container {
    padding: 0 1.5rem;
  }
}

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

.text-accent {
  color: var(--accent-green);
}

/* ==========================================================================
   BUTTONS & FORM CONTROLS (TOUCH-ACCESSIBLE)
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-weight: 500;
  font-size: 0.95rem;
  min-height: var(--tap-target-min);
  padding: 0.65rem 1.4rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  line-height: 1.2;
  user-select: none;
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--accent-green);
  color: #FFFFFF;
}

.btn-primary:hover {
  background-color: var(--accent-green-hover);
}

.btn-secondary {
  background-color: var(--bg-white);
  color: var(--text-primary);
  border-color: var(--border-color-strong);
}

.btn-secondary:hover {
  background-color: var(--bg-gray);
}

.btn-nav {
  min-height: 36px;
  padding: 0.45rem 1rem;
  font-size: 0.85rem;
  border-radius: var(--radius-pill);
}

.btn-lg {
  min-height: 48px;
  padding: 0.85rem 1.8rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
}

.btn-sm {
  min-height: 38px;
  padding: 0.45rem 0.9rem;
  font-size: 0.85rem;
}

.btn-block {
  width: 100%;
}

.clean-select {
  background-color: var(--bg-white);
  color: var(--text-primary);
  border: 1px solid var(--border-color-strong);
  border-radius: var(--radius-sm);
  padding: 0.55rem 0.9rem;
  font-size: 0.88rem;
  font-weight: 500;
  min-height: var(--tap-target-min);
  outline: none;
  cursor: pointer;
  transition: var(--transition);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%236E6E73' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  padding-right: 2.2rem;
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  max-width: 100%;
}

.clean-select:focus {
  border-color: var(--accent-green);
}

.clean-select-sm {
  min-height: 38px;
  padding: 0.4rem 0.75rem;
  padding-right: 2rem;
  font-size: 0.82rem;
}

.clean-slider {
  accent-color: var(--accent-green);
  cursor: pointer;
  min-height: 36px;
  width: 100%;
}

.card {
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-subtle);
  min-width: 0;
  max-width: 100%;
}

/* ==========================================================================
   1. NAVIGATION BAR & MOBILE DRAWER
   ========================================================================== */

.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  height: var(--nav-height);
  width: 100%;
}

.nav-container {
  width: 100%;
  max-width: 1140px;
  margin-inline: auto;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1rem;
  gap: 0.75rem;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  font-size: 0.94rem;
  color: var(--text-primary);
  min-width: 0;
  max-width: calc(100% - 56px);
  flex-shrink: 0;
}

.brand-icon {
  color: var(--accent-green);
  flex-shrink: 0;
}

.brand-text {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Desktop navigation links - hidden on mobile/tablet */
.nav-links {
  display: none;
  align-items: center;
  gap: 1.5rem;
}

.nav-link {
  font-size: 0.88rem;
  color: var(--text-secondary);
  font-weight: 400;
  transition: var(--transition);
  position: relative;
  padding: 0.4rem 0;
  white-space: nowrap;
}

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

.nav-link.active {
  color: var(--accent-green);
  font-weight: 600;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
  margin-left: auto;
}

.hw-badge {
  display: none;
  align-items: center;
  gap: 0.45rem;
  padding: 0.3rem 0.65rem;
  border-radius: var(--radius-pill);
  background-color: var(--accent-green-light);
  color: var(--accent-green);
  font-size: 0.75rem;
  font-weight: 600;
  white-space: nowrap;
}

.pulse-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--accent-green);
  animation: pulseLight 2s infinite;
  flex-shrink: 0;
}

@keyframes pulseLight {
  0% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.4); opacity: 0.6; }
  100% { transform: scale(1); opacity: 1; }
}

.btn-nav {
  display: none;
}

/* Mobile Toggle Hamburger Button (Accessible 44x44 tap target) */
.mobile-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: var(--tap-target-min);
  height: var(--tap-target-min);
  min-width: var(--tap-target-min);
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 10px;
  gap: 5px;
  position: relative;
  transition: background-color 0.2s ease;
  flex-shrink: 0;
}

.mobile-toggle:hover {
  background-color: var(--bg-gray);
}

.mobile-toggle .bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--text-primary);
  border-radius: 2px;
  transition: transform 0.25s var(--ease-apple), opacity 0.2s ease;
  transform-origin: center;
}

.mobile-toggle.open .bar-1 {
  transform: translateY(7px) rotate(45deg);
}

.mobile-toggle.open .bar-2 {
  opacity: 0;
  transform: scaleX(0);
}

.mobile-toggle.open .bar-3 {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Drawer Overlay */
.mobile-drawer {
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  z-index: 99;
  background-color: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(25px);
  -webkit-backdrop-filter: blur(25px);
  border-bottom: 1px solid var(--border-color);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.1);
  transform: translateY(-110%);
  opacity: 0;
  pointer-events: none;
  transition: transform 0.3s var(--ease-apple), opacity 0.25s ease;
  max-height: calc(100vh - var(--nav-height));
  overflow-y: auto;
}

.mobile-drawer.open {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.mobile-drawer-inner {
  padding: 1.25rem 1rem 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.mobile-nav-link {
  display: flex;
  align-items: center;
  min-height: 48px;
  padding: 0.6rem 0.85rem;
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--text-primary);
  border-radius: var(--radius-sm);
  transition: background-color 0.15s ease, color 0.15s ease;
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
  background-color: var(--bg-gray);
  color: var(--accent-green);
  font-weight: 600;
}

.mobile-drawer-footer {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
}

.mobile-hw-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-pill);
  background-color: var(--accent-green-light);
  color: var(--accent-green);
  font-size: 0.78rem;
  font-weight: 600;
  width: fit-content;
}

.btn-mobile-cta {
  min-height: 48px;
  font-size: 1rem;
  font-weight: 600;
}

.mobile-backdrop {
  position: fixed;
  inset: 0;
  top: var(--nav-height);
  background-color: rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
  z-index: 98;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.mobile-backdrop.open {
  opacity: 1;
  pointer-events: auto;
}

/* ==========================================================================
   2. HERO SECTION
   ========================================================================== */

.hero-section {
  padding: clamp(2rem, 5vw, 4.5rem) 0 clamp(1.75rem, 4vw, 3.5rem);
  background-color: var(--bg-white);
}

.hero-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.hero-eyebrow {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-green);
  margin-bottom: 0.65rem;
}

.hero-title {
  font-size: clamp(1.75rem, 6.5vw, 3.4rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  line-height: 1.15;
  margin-bottom: 0.85rem;
  word-break: break-word;
}

.hero-subtitle {
  font-size: clamp(0.95rem, 2.8vw, 1.25rem);
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 1.5rem;
  max-width: 52ch;
}

.hero-cta-row {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1.75rem;
  width: 100%;
}

.hero-cta-row .btn {
  width: 100%;
}

.hero-highlights {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem 1rem;
  padding: 1.1rem;
  background-color: var(--bg-gray);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.highlight-item {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  min-width: 0;
}

.highlight-value {
  font-size: clamp(1.15rem, 3.2vw, 1.45rem);
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.highlight-label {
  font-size: 0.72rem;
  color: var(--text-secondary);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.highlight-divider {
  display: none;
}

.hero-visual {
  min-width: 0;
}

.hero-card {
  background-color: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: var(--transition);
}

.hero-card:hover {
  box-shadow: var(--shadow-hover);
}

.hero-image {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  background-color: #F0F0F2;
}

.hero-card-footer {
  padding: 0.85rem 1.1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-white);
  flex-wrap: wrap;
}

.hero-card-meta {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.meta-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-green);
  flex-shrink: 0;
}

.meta-title {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-primary);
}

.hero-card-tag {
  font-size: 0.74rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* ==========================================================================
   SECTIONS & SECTION HEADERS
   ========================================================================== */

.section {
  padding: clamp(2.75rem, 5.5vw, 5rem) 0;
}

.section-gray {
  background-color: var(--bg-gray);
}

.section-header {
  margin-bottom: clamp(1.5rem, 3.5vw, 2.5rem);
  max-width: 680px;
  margin-inline: auto;
}

.section-tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-green);
  margin-bottom: 0.45rem;
}

.section-title {
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  line-height: 1.2;
  margin-bottom: 0.55rem;
}

.section-desc {
  font-size: clamp(0.88rem, 2vw, 1.02rem);
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ==========================================================================
   3. AI CLASSIFICATION SECTION
   ========================================================================== */

.sorter-controls-panel {
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.15rem;
  margin-bottom: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.model-picker-wrap {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  width: 100%;
}

.picker-label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.quick-samples-wrap {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  width: 100%;
}

.quick-samples-label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.sample-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.sample-chip {
  background-color: var(--bg-gray);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-pill);
  padding: 0.4rem 0.8rem;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-primary);
  cursor: pointer;
  transition: var(--transition);
  min-height: 36px;
  display: inline-flex;
  align-items: center;
}

.sample-chip:hover {
  background-color: #EAEAEF;
  border-color: var(--border-color-strong);
}

.sample-chip.active {
  background-color: var(--accent-green);
  color: #FFFFFF;
  border-color: var(--accent-green);
}

/* Sorter Main Grid */
.sorter-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  align-items: start;
}

/* Input Card */
.sorter-input-card {
  padding: 1.15rem;
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
}

.card-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.65rem;
  flex-wrap: wrap;
}

.card-heading {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.mode-tabs {
  display: inline-flex;
  background-color: var(--bg-gray);
  padding: 3px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

.tab-btn {
  background: none;
  border: none;
  padding: 0.4rem 0.8rem;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: 6px;
  cursor: pointer;
  transition: var(--transition);
  min-height: 34px;
}

.tab-btn.active {
  background-color: #FFFFFF;
  color: var(--text-primary);
  font-weight: 600;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

/* Dropzone */
.dropzone {
  border: 2px dashed var(--border-color-strong);
  border-radius: var(--radius-md);
  padding: 2.25rem 1rem;
  text-align: center;
  background-color: var(--bg-gray-subtle);
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 190px;
}

.dropzone:hover,
.dropzone.dragover {
  border-color: var(--accent-green);
  background-color: var(--accent-green-light);
}

.file-input-hidden {
  display: none;
}

.dropzone-body {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.55rem;
}

.dropzone-icon {
  color: var(--text-secondary);
}

.dropzone-main-text {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-primary);
}

.dropzone-sub-text {
  font-size: 0.78rem;
  color: var(--text-tertiary);
}

/* Webcam Area */
.webcam-wrap {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.webcam-frame {
  position: relative;
  background-color: #000000;
  border-radius: var(--radius-sm);
  overflow: hidden;
  aspect-ratio: 4 / 3;
  max-height: 300px;
  width: 100%;
}

.webcam-frame video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.webcam-buttons {
  display: flex;
  gap: 0.5rem;
  width: 100%;
}

.webcam-buttons .btn {
  flex: 1;
}

/* Preview Wrap */
.preview-wrap {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.preview-frame {
  position: relative;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--border-color);
  background-color: var(--bg-gray);
  max-height: 260px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.preview-frame img {
  max-height: 260px;
  width: 100%;
  object-fit: contain;
}

.btn-clear {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--border-color);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  box-shadow: var(--shadow-subtle);
  transition: var(--transition);
}

.btn-clear:hover {
  background-color: #FFFFFF;
  transform: scale(1.05);
}

/* Results Card */
.sorter-results-card {
  padding: 1.15rem;
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
  min-height: 340px;
}

/* Idle State */
.results-idle {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2.75rem 1rem;
  color: var(--text-tertiary);
  margin: auto;
}

.idle-icon-wrap {
  margin-bottom: 0.75rem;
  color: var(--text-tertiary);
}

.idle-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
}

.idle-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  max-width: 36ch;
}

/* Loading State */
.results-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 3rem 1rem;
  margin: auto;
}

.clean-spinner {
  width: 34px;
  height: 34px;
  border: 3px solid var(--border-color-strong);
  border-top-color: var(--accent-green);
  border-radius: 50%;
  animation: spin 0.75s linear infinite;
  margin-bottom: 0.85rem;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.3rem;
}

.loading-desc {
  font-size: 0.82rem;
  color: var(--text-secondary);
}

/* Active Result State */
.results-content {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.primary-result {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.85rem;
  padding: 1rem;
  background-color: var(--bg-gray);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  flex-wrap: wrap;
}

.primary-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-width: 0;
}

.primary-icon-box {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background-color: #FFFFFF;
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--accent-green);
}

.badge {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-pill);
  background-color: var(--accent-green-light);
  color: var(--accent-green);
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  margin-bottom: 0.15rem;
}

.primary-class {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  text-transform: capitalize;
  line-height: 1.2;
}

.primary-subtitle {
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.primary-right {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  flex-shrink: 0;
}

.confidence-val {
  font-size: 1.55rem;
  font-weight: 700;
  color: var(--accent-green);
  line-height: 1;
}

.confidence-lbl {
  font-size: 0.7rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  font-weight: 500;
}

/* Bin Card */
.bin-card {
  padding: 0.85rem 1rem;
  background-color: var(--bg-gray-subtle);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--accent-green);
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.bin-label {
  font-size: 0.72rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.bin-name {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* Meta Strip */
.meta-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.4rem;
  padding: 0.7rem 0.4rem;
  background-color: var(--bg-gray);
  border-radius: var(--radius-sm);
  text-align: center;
}

.meta-unit {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  min-width: 0;
}

.meta-k {
  font-size: 0.68rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  font-weight: 600;
}

.meta-v {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Handling Steps & Impact */
.instructions-block {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.instructions-title {
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--text-primary);
}

.steps-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.steps-list li {
  position: relative;
  padding-left: 1rem;
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

.steps-list li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--accent-green);
  font-size: 1.1rem;
  line-height: 1;
}

.impact-block {
  background-color: var(--bg-gray);
  border-radius: var(--radius-sm);
  padding: 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.impact-header {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  color: var(--accent-green);
}

.impact-text {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

.bio-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.76rem;
  padding-top: 0.4rem;
  border-top: 1px solid var(--border-color);
  color: var(--text-secondary);
}

.bio-row strong {
  color: var(--text-primary);
}

/* 10-Class Probability Bars (Mobile-Safe Defensive Grid) */
.probabilities-block {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border-color);
}

.probabilities-title {
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--text-primary);
}

.probabilities-list {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.prob-row {
  display: grid;
  grid-template-columns: minmax(68px, 85px) 1fr 46px;
  align-items: center;
  gap: 0.5rem;
  min-width: 0;
  font-size: 0.8rem;
}

.prob-name {
  color: var(--text-primary);
  font-weight: 500;
  text-transform: capitalize;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.prob-track {
  height: 8px;
  border-radius: var(--radius-pill);
  background-color: var(--bg-gray);
  overflow: hidden;
  position: relative;
  min-width: 0;
}

.prob-fill {
  height: 100%;
  border-radius: var(--radius-pill);
  transition: width 0.4s var(--ease-apple);
}

.prob-val {
  color: var(--text-secondary);
  font-size: 0.76rem;
  font-family: var(--font-mono);
  text-align: right;
  white-space: nowrap;
}

/* ==========================================================================
   4. EXPLAINABLE AI SECTION (Grad-CAM)
   ========================================================================== */

.xai-studio-card {
  padding: 1.15rem;
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
}

.xai-controls-bar {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  padding-bottom: 1.15rem;
  border-bottom: 1px solid var(--border-color);
  width: 100%;
}

.xai-control-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  width: 100%;
}

.xai-label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  display: flex;
  justify-content: space-between;
}

.xai-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2.25rem 1rem;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.85rem;
  gap: 0.65rem;
}

.xai-stage {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.85rem;
}

.xai-pane {
  background-color: var(--bg-gray-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.xai-pane-header {
  padding: 0.55rem 0.8rem;
  background-color: var(--bg-white);
  border-bottom: 1px solid var(--border-color);
  font-size: 0.76rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.xai-pane-body {
  padding: 0.65rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: #FAFAFA;
}

.xai-pane-body img {
  width: 100%;
  aspect-ratio: 1 / 1;
  max-height: 260px;
  object-fit: contain;
  border-radius: 4px;
}

.xai-metrics-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.65rem;
  padding: 0.85rem;
  background-color: var(--bg-gray);
  border-radius: var(--radius-sm);
}

.xai-stat {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  min-width: 0;
}

.xai-stat-lbl {
  font-size: 0.7rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  font-weight: 500;
}

.xai-stat-val {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.xai-note {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.45;
  padding: 0.7rem;
  border-left: 3px solid var(--accent-green);
  background-color: var(--bg-gray-subtle);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

/* ==========================================================================
   5. MODEL PERFORMANCE & BENCHMARKS SECTION
   ========================================================================== */

.stats-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.stat-card {
  padding: 1.1rem 0.9rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  text-align: left;
}

.stat-card-label {
  font-size: 0.72rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.stat-card-num {
  font-size: clamp(1.3rem, 3.8vw, 1.85rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  line-height: 1.15;
}

.stat-card-sub {
  font-size: 0.72rem;
  color: var(--text-secondary);
}

/* Benchmark Table Card */
.table-card {
  padding: 1.15rem;
  margin-bottom: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.table-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.table-card-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
}

.table-hint {
  font-size: 0.72rem;
  color: var(--text-secondary);
  font-style: italic;
}

.table-wrap {
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
}

.clean-table {
  width: 100%;
  min-width: 580px;
  border-collapse: collapse;
  font-size: 0.82rem;
  text-align: left;
}

.clean-table th,
.clean-table td {
  padding: 0.8rem 0.95rem;
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}

.clean-table th {
  background-color: var(--bg-gray);
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.clean-table tbody tr:hover {
  background-color: var(--bg-gray-subtle);
}

.clean-table tbody tr:last-child td {
  border-bottom: none;
}

.table-highlight-row {
  background-color: var(--accent-green-light) !important;
  color: var(--accent-green);
}

.badge-primary {
  display: inline-block;
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-pill);
  background-color: var(--accent-green);
  color: #FFFFFF;
  font-size: 0.68rem;
  font-weight: 600;
  margin-left: 0.35rem;
}

/* Plots Gallery */
.plots-card {
  padding: 1.15rem;
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
}

.plots-header-row {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.plots-card-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
}

.plot-filter-chips {
  display: flex;
  gap: 0.4rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 4px;
}

.filter-chip {
  background-color: var(--bg-gray);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-pill);
  padding: 0.35rem 0.8rem;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-primary);
  cursor: pointer;
  white-space: nowrap;
  transition: var(--transition);
  min-height: 36px;
}

.filter-chip:hover {
  background-color: #EAEAEF;
}

.filter-chip.active {
  background-color: var(--accent-green);
  color: #FFFFFF;
  border-color: var(--accent-green);
}

.plots-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.85rem;
}

.plot-thumb-card {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background-color: #FFFFFF;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.plot-thumb-card:hover {
  box-shadow: var(--shadow-card);
  border-color: var(--accent-green);
}

.plot-img-wrap {
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background-color: #F8F8F8;
  display: flex;
  align-items: center;
  justify-content: center;
}

.plot-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.plot-info {
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.plot-cat {
  font-size: 0.68rem;
  color: var(--accent-green);
  font-weight: 600;
  text-transform: uppercase;
}

.plot-name {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
}

.plot-desc {
  font-size: 0.76rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

/* ==========================================================================
   6. RECYCLING GUIDE SECTION
   ========================================================================== */

.guide-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.85rem;
}

.guide-item-card {
  padding: 1.15rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 0.85rem;
}

.guide-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.guide-badge {
  display: inline-block;
  padding: 0.18rem 0.5rem;
  border-radius: var(--radius-pill);
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
}

.guide-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.2rem;
}

.guide-bin-name {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent-green);
  margin-bottom: 0.55rem;
}

.guide-summary {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.4;
  margin-bottom: 0.75rem;
}

.guide-steps {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 0.65rem 0;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 0.55rem;
}

.guide-steps li {
  position: relative;
  padding-left: 0.95rem;
  font-size: 0.78rem;
  color: var(--text-primary);
  line-height: 1.4;
}

.guide-steps li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--accent-green);
}

.guide-bio-text {
  font-size: 0.76rem;
  color: var(--text-secondary);
}

/* ==========================================================================
   LIGHTBOX MODAL
   ========================================================================== */

.lightbox-modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem;
}

.lightbox-backdrop {
  position: absolute;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.78);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.lightbox-content {
  position: relative;
  z-index: 1001;
  max-width: 960px;
  width: 100%;
  max-height: 90vh;
  background-color: #FFFFFF;
  border-radius: var(--radius-md);
  padding: 0.85rem;
  display: flex;
  flex-direction: column;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.3);
}

.lightbox-close {
  position: absolute;
  top: 8px;
  right: 8px;
  background-color: var(--bg-gray);
  border: none;
  border-radius: 50%;
  width: var(--tap-target-min);
  height: var(--tap-target-min);
  min-width: var(--tap-target-min);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  transition: var(--transition);
}

.lightbox-close:hover {
  background-color: #E2E2E6;
  transform: scale(1.05);
}

.lightbox-content img {
  max-height: 70vh;
  object-fit: contain;
  margin: 0 auto;
  border-radius: 4px;
}

.lightbox-caption {
  font-size: 0.8rem;
  color: var(--text-secondary);
  text-align: center;
  margin-top: 0.55rem;
}

/* ==========================================================================
   7. FOOTER
   ========================================================================== */

.footer {
  padding: 32px 0;
  background-color: var(--bg-white);
  border-top: 1px solid var(--border-color);
  font-size: 0.82rem;
}

.footer-container {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  text-align: left;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.footer-brand strong {
  font-weight: 600;
  color: var(--text-primary);
}

.footer-brand span {
  color: var(--text-secondary);
  font-size: 0.78rem;
}

.footer-copy {
  color: var(--text-secondary);
  font-size: 0.78rem;
}

/* ==========================================================================
   PROGRESSIVE ENHANCEMENT: BREAKPOINTS
   ========================================================================== */

/* 1. Phablets & Small Tablets (>= 580px) */
@media (min-width: 580px) {
  .hero-cta-row {
    flex-direction: row;
  }

  .hero-cta-row .btn {
    flex: 1;
    width: auto;
  }
}

/* 2. Large Mobile & Tablets (>= 600px) */
@media (min-width: 600px) {
  .hero-highlights {
    gap: 1rem 1.5rem;
  }

  .xai-controls-bar {
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: flex-end;
  }

  .xai-controls-bar .opacity-control {
    grid-column: span 2;
  }

  .xai-controls-bar button {
    grid-column: span 2;
  }

  .guide-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .plots-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* 3. Laptops & Large Screens (>= 992px) */
@media (min-width: 992px) {
  :root {
    --nav-height: 64px;
  }

  /* Desktop Navbar activates only when screen has ample room */
  .nav-links {
    display: flex;
  }

  .btn-nav {
    display: inline-flex;
  }

  .hw-badge {
    display: inline-flex;
  }

  .mobile-toggle,
  .mobile-drawer,
  .mobile-backdrop {
    display: none !important;
  }

  /* Hero */
  .hero-container {
    grid-template-columns: 1.15fr 1fr;
    gap: 3.5rem;
  }

  .hero-cta-row {
    width: auto;
  }

  .hero-cta-row .btn {
    flex: initial;
    width: auto;
  }

  .hero-highlights {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.25rem;
    padding: 1.25rem 1.5rem;
  }

  .highlight-divider {
    display: block;
    width: 1px;
    height: 36px;
    background-color: var(--border-color-strong);
  }

  /* Sorter Studio */
  .sorter-controls-panel {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem 1.5rem;
  }

  .model-picker-wrap {
    width: auto;
    flex-direction: row;
    align-items: center;
    gap: 0.85rem;
  }

  .clean-select {
    width: auto;
  }

  .quick-samples-wrap {
    width: auto;
    flex-direction: row;
    align-items: center;
    gap: 0.85rem;
  }

  .sorter-grid {
    grid-template-columns: 1.05fr 1fr;
    gap: 2rem;
  }

  .sorter-input-card,
  .sorter-results-card {
    padding: 1.75rem;
  }

  /* Explainable AI */
  .xai-controls-bar {
    display: flex;
    flex-direction: row;
    align-items: flex-end;
    gap: 1.25rem;
  }

  .xai-control-group {
    width: auto;
  }

  .xai-controls-bar .opacity-control {
    width: 180px;
    grid-column: auto;
  }

  .xai-controls-bar button {
    grid-column: auto;
  }

  .xai-stage {
    grid-template-columns: repeat(3, 1fr);
  }

  .xai-metrics-row {
    grid-template-columns: repeat(4, 1fr);
  }

  /* Performance */
  .stats-row {
    grid-template-columns: repeat(4, 1fr);
  }

  .plots-header-row {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  /* Guide */
  .guide-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
  }

  /* Footer */
  .footer-container {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

/* 4. Large Desktop Displays (>= 1200px) */
@media (min-width: 1200px) {
  .hero-container {
    gap: 4rem;
  }

  .hero-title {
    font-size: 3.5rem;
  }
}

/* ==========================================================================
   ACCESSIBILITY & PREFERENCES
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .pulse-dot {
    animation: none;
  }
}