/* ==========================================================================
   MINIMALIST IPHONE-OPTIMIZED STYLESHEET — HEIC TO JPG (2026 EDITION)
   Default: Pure Minimalist White Mode • Toggle: Dark Mode
   Target Audience: iPhone Mobile & Cross-Platform Users
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;600&family=Plus+Jakarta+Sans:wght@600;700;800&display=swap');
@import url('./foundation.css');

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  background-color: var(--color-bg-base);
  color: var(--color-text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100dvh;
  position: relative;
  overflow-x: hidden;
  transition: background-color var(--transition-base), color var(--transition-base);
}

/* Subtle clean background mesh */
.bg-ambient-glow {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
  opacity: 0.5;
}

[data-theme="dark"] .bg-ambient-glow {
  opacity: 0.8;
}

.glow-orb-1 {
  position: absolute;
  top: -10%;
  left: 20%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, var(--color-primary-glow) 0%, transparent 70%);
  filter: blur(80px);
}

.glow-orb-2 {
  position: absolute;
  bottom: 10%;
  right: 10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(2, 132, 199, 0.08) 0%, transparent 70%);
  filter: blur(90px);
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: 1060px;
  margin: 0 auto;
  padding: 0 var(--space-5);
  position: relative;
  z-index: 1;
}

/* Header & iOS Minimal Navigation */
.site-header {
  position: sticky;
  top: 0;
  width: 100%;
  z-index: 100;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  background: var(--color-bg-glass);
  border-bottom: 1px solid var(--color-border-subtle);
  transition: background-color var(--transition-base), border-color var(--transition-base);
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--color-text-main);
}

.brand-icon {
  width: 34px;
  height: 34px;
  background: var(--color-primary);
  border-radius: var(--radius-control);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: var(--shadow-btn);
  transition: transform var(--transition-fast);
}

.brand-logo:hover .brand-icon {
  transform: scale(1.05);
}

.brand-text {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: var(--text-lg);
  letter-spacing: -0.02em;
}

.brand-badge {
  font-size: 11px;
  padding: 2px 8px;
  background: var(--color-primary-light);
  color: #065f46;
  border: 1px solid #a7f3d0;
  border-radius: var(--radius-pill);
  font-weight: 700;
  margin-left: var(--space-1);
}

[data-theme="dark"] .brand-badge {
  background: rgba(16, 185, 129, 0.2);
  color: #34d399;
  border-color: rgba(16, 185, 129, 0.4);
}

.nav-right-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  list-style: none;
}

.nav-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: 500;
  transition: color var(--transition-fast);
}

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

/* Light / Dark Mode Toggle Button */
.btn-theme-toggle {
  background: var(--color-bg-inset);
  border: 1px solid var(--color-border-subtle);
  color: var(--color-text-main);
  padding: 7px 14px;
  border-radius: var(--radius-pill);
  font-size: var(--text-xs);
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.btn-theme-toggle:hover {
  background: var(--color-border-subtle);
}

/* Breadcrumb */
.breadcrumb-nav {
  padding: var(--space-3) 0;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  list-style: none;
}

.breadcrumb-item a {
  color: var(--color-text-muted);
  text-decoration: none;
}

.breadcrumb-item a:hover {
  color: var(--color-text-main);
}

.breadcrumb-separator {
  color: var(--color-text-muted);
  opacity: 0.6;
}

.breadcrumb-current {
  color: var(--color-primary);
  font-weight: 600;
}

/* Hero Section */
.hero-section {
  padding: var(--space-6) 0 var(--space-8);
  text-align: center;
}

.hero-pill-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--color-primary-light);
  color: var(--color-primary);
  padding: 5px 14px;
  border-radius: var(--radius-pill);
  font-size: var(--text-xs);
  font-weight: 700;
  margin-bottom: var(--space-3);
}

.hero-title {
  font-size: clamp(1.85rem, 5vw, 3rem);
  font-weight: 800;
  line-height: 1.18;
  margin-bottom: var(--space-3);
  letter-spacing: -0.03em;
}

.hero-subtitle {
  font-size: clamp(0.95rem, 2vw, 1.125rem);
  color: var(--color-text-secondary);
  max-width: 620px;
  margin: 0 auto var(--space-6);
  line-height: 1.5;
}

/* Minimalist Converter Card (iPhone Focused) */
.converter-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-card);
  border-radius: var(--radius-surface);
  padding: var(--space-6);
  box-shadow: var(--shadow-card);
  max-width: 780px;
  margin: 0 auto;
  position: relative;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

/* Dropzone / Upload Area */
.dropzone {
  border: 2px dashed var(--color-border-subtle);
  background: var(--color-bg-inset);
  border-radius: var(--radius-inset);
  padding: var(--space-8) var(--space-4);
  text-align: center;
  cursor: pointer;
  position: relative;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.dropzone:hover, .dropzone.drag-active {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

.dropzone-icon-wrap {
  width: 56px;
  height: 56px;
  background: var(--color-primary-light);
  border-radius: var(--radius-control);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-3);
  color: var(--color-primary);
}

.dropzone-heading {
  font-size: var(--text-lg);
  font-weight: 700;
  margin-bottom: var(--space-1);
}

.dropzone-sub {
  color: var(--color-text-secondary);
  font-size: var(--text-xs);
  margin-bottom: var(--space-5);
}

.dropzone-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}

/* In-Dropzone Active Converting State (Zero Scroll Needed!) */
.dropzone-active-state {
  display: none;
  padding: var(--space-4) 0;
}

.spinner-ring {
  display: inline-block;
  width: 44px;
  height: 44px;
  border: 3px solid var(--color-border-subtle);
  border-radius: 50%;
  border-top-color: var(--color-primary);
  animation: spin 800ms linear infinite;
  margin-bottom: var(--space-3);
}

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

.active-status-title {
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-text-main);
  margin-bottom: var(--space-2);
}

.active-bar-wrap {
  max-width: 380px;
  margin: var(--space-3) auto 0;
  background: var(--color-border-subtle);
  height: 10px;
  border-radius: var(--radius-pill);
  overflow: hidden;
}

.active-bar-fill {
  height: 100%;
  width: 0%;
  background: var(--color-primary);
  border-radius: var(--radius-pill);
  transition: width 150ms ease;
}

/* In-Dropzone Success State (Instant Action without scrolling) */
.dropzone-success-state {
  display: none;
  padding: var(--space-4) 0;
}

.success-icon-badge {
  width: 52px;
  height: 52px;
  background: var(--color-primary-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  margin: 0 auto var(--space-3);
  box-shadow: var(--shadow-btn);
}

.success-title {
  font-size: var(--text-xl);
  font-weight: 800;
  color: var(--color-text-main);
  margin-bottom: var(--space-1);
}

.success-sub {
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-5);
}

/* In-Dropzone Instant Converted Preview Card */
.dropzone-preview-card {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-card);
  padding: var(--space-3) var(--space-5);
  max-width: 440px;
  margin: 0 auto var(--space-5);
  box-shadow: var(--shadow-sm);
  animation: popIn 250ms cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes popIn {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}

.dropzone-thumb-wrap {
  width: 68px;
  height: 68px;
  border-radius: var(--radius-control);
  overflow: hidden;
  background: var(--color-bg-inset);
  flex-shrink: 0;
  border: 1px solid var(--color-border-subtle);
}

.dropzone-thumb-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.dropzone-preview-details {
  text-align: left;
  flex: 1;
  min-width: 0;
}

.dropzone-preview-name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--text-sm);
  color: var(--color-text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 3px;
}

.dropzone-preview-size {
  font-size: var(--text-xs);
  color: var(--color-primary);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.success-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-bottom: var(--space-3);
}

.btn-success-download {
  background: var(--color-primary);
  color: #fff;
  border: none;
  padding: 14px 28px;
  border-radius: var(--radius-pill);
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: 700;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  box-shadow: 0 4px 14px rgba(5, 150, 105, 0.35);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.btn-success-download:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(5, 150, 105, 0.45);
}

.btn-success-download:active {
  transform: translateY(0);
}

.btn-success-reset {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-subtle);
  color: var(--color-text-main);
  padding: 13px 22px;
  border-radius: var(--radius-pill);
  font-size: var(--text-xs);
  font-weight: 600;
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.btn-success-reset:hover {
  background: var(--color-border-subtle);
}

.dropzone-scroll-hint {
  margin-top: var(--space-2);
}

.scroll-hint-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: var(--text-xs);
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 600;
  transition: color var(--transition-fast);
}

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

/* Prominent iPhone Upload Button */
.btn-upload {
  background: var(--color-primary);
  color: #fff;
  border: none;
  padding: 14px 28px;
  border-radius: var(--radius-pill);
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: 700;
  cursor: pointer;
  box-shadow: var(--shadow-btn);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  transition: background-color var(--transition-fast), transform var(--transition-fast);
  min-height: 48px;
}

.btn-upload:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
}

.btn-sample {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-subtle);
  color: var(--color-text-main);
  padding: 12px 20px;
  border-radius: var(--radius-pill);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 48px;
  transition: background-color var(--transition-fast);
}

.btn-sample:hover {
  background: var(--color-bg-inset);
}

.hidden-input {
  display: none;
}

.dropzone-perks {
  margin-top: var(--space-5);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  flex-wrap: wrap;
  font-size: 12px;
  color: var(--color-text-secondary);
  font-weight: 600;
}

.dropzone-perk-item {
  display: flex;
  align-items: center;
  gap: 4px;
}

.dropzone-perk-item svg {
  color: var(--color-primary);
}

/* Minimalist Segmented Controls Bar */
.converter-controls {
  margin-top: var(--space-5);
  padding: var(--space-4);
  background: var(--color-bg-inset);
  border-radius: var(--radius-inset);
  border: 1px solid var(--color-border-subtle);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.control-group-title {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #1e293b;
  font-weight: 800;
  margin-bottom: var(--space-2);
  text-align: left;
}

[data-theme="dark"] .control-group-title {
  color: #cbd5e1;
}

.preset-pills {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: var(--space-2);
}

.preset-pill {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-subtle);
  color: var(--color-text-secondary);
  padding: 10px 12px;
  border-radius: var(--radius-control);
  font-size: var(--text-xs);
  font-weight: 600;
  cursor: pointer;
  text-align: center;
  transition: all var(--transition-fast);
  min-height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.preset-pill:hover {
  color: var(--color-text-main);
  border-color: var(--color-text-muted);
}

.preset-pill.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
  box-shadow: var(--shadow-btn);
}

/* iOS Toggles */
.toggle-group {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  flex-wrap: wrap;
}

.custom-toggle-label {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  cursor: pointer;
  font-weight: 500;
  user-select: none;
}

.custom-toggle-input {
  appearance: none;
  width: 38px;
  height: 22px;
  background: var(--color-border-subtle);
  border-radius: var(--radius-pill);
  position: relative;
  cursor: pointer;
  outline: none;
  transition: background-color var(--transition-fast);
}

.custom-toggle-input::before {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
  transition: transform var(--transition-fast);
}

.custom-toggle-input:checked {
  background: var(--color-primary);
}

.custom-toggle-input:checked::before {
  transform: translateX(16px);
}

/* Converted Photos List */
.results-container {
  display: none;
  margin-top: var(--space-6);
  text-align: left;
}

.results-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-3);
  flex-wrap: wrap;
  gap: var(--space-3);
}

.results-title {
  font-size: var(--text-base);
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.results-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.btn-download-all {
  background: var(--color-secondary);
  color: #fff;
  border: none;
  padding: 9px 18px;
  border-radius: var(--radius-pill);
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  font-weight: 700;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  box-shadow: 0 2px 8px rgba(2, 132, 199, 0.25);
  transition: background-color var(--transition-fast);
}

.btn-download-all:hover {
  background: #0270a8;
}

.btn-clear {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-subtle);
  color: var(--color-text-secondary);
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  font-size: var(--text-xs);
  cursor: pointer;
}

.file-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--space-3);
}

.file-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-inset);
  padding: var(--space-3);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  transition: border-color var(--transition-fast);
}

.file-card:hover {
  border-color: var(--color-primary);
}

.file-card-preview {
  width: 100%;
  height: 140px;
  background: var(--color-bg-inset);
  border-radius: var(--radius-tight);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.file-card-preview img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.file-card-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.file-card-name {
  font-weight: 600;
  font-size: var(--text-xs);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.file-card-meta {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: 11px;
  color: var(--color-text-muted);
}

.file-size-badge {
  color: var(--color-primary);
  font-weight: 700;
}

.file-savings-badge {
  color: var(--color-secondary);
  font-weight: 600;
}

.file-card-btn {
  background: var(--color-primary-light);
  border: 1px solid var(--color-border-subtle);
  color: var(--color-primary);
  padding: 8px 12px;
  border-radius: var(--radius-control);
  font-size: var(--text-xs);
  font-weight: 700;
  text-decoration: none;
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  min-height: 38px;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.file-card-btn:hover {
  background: var(--color-primary);
  color: #fff;
}

/* Mobile Floating Sticky Bar (Always visible on mobile without scrolling!) */
.mobile-floating-bar {
  display: none;
}

@media (max-width: 640px) {
  .mobile-floating-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background: var(--color-bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-top: 1px solid var(--color-border-subtle);
    padding: 12px 16px calc(12px + env(safe-area-inset-bottom));
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.1);
    z-index: 999;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transform: translateY(100%);
    transition: transform var(--transition-base);
  }

  .mobile-floating-bar.show {
    transform: translateY(0);
  }

  .mobile-floating-title {
    font-size: var(--text-xs);
    font-weight: 700;
    color: var(--color-text-main);
    display: flex;
    align-items: center;
    gap: 6px;
  }

  .mobile-floating-btn {
    background: var(--color-primary);
    color: #fff;
    border: none;
    padding: 9px 18px;
    border-radius: var(--radius-pill);
    font-size: var(--text-xs);
    font-weight: 700;
    cursor: pointer;
  }
}

/* Minimalist Clean Sections */
.section-tag {
  color: var(--color-primary);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-1);
  display: block;
}

.section-title {
  font-size: clamp(1.4rem, 3.5vw, 2.1rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  margin-bottom: var(--space-2);
}

.section-desc {
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  max-width: 600px;
  margin-bottom: var(--space-6);
  line-height: 1.5;
}

/* Bento Cards */
.features-section {
  padding: var(--space-10) 0;
  border-top: 1px solid var(--color-border-subtle);
}

.features-bento {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-4);
}

.bento-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-card);
  border-radius: var(--radius-surface);
  padding: var(--space-5);
  box-shadow: var(--shadow-subtle);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.bento-icon-box {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-control);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-3);
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.bento-title {
  font-size: var(--text-base);
  font-weight: 700;
  margin-bottom: var(--space-2);
}

.bento-text {
  color: var(--color-text-secondary);
  font-size: var(--text-xs);
  line-height: 1.6;
}

.bento-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  background: #f1f5f9;
  border: 1px solid #cbd5e1;
  color: #0f172a;
  margin-top: var(--space-3);
  align-self: flex-start;
}

[data-theme="dark"] .bento-badge {
  background: #1e293b;
  border-color: #334155;
  color: #f1f5f9;
}

/* Interactive Before & After Slider */
.before-after-section {
  padding: var(--space-10) 0;
  border-top: 1px solid var(--color-border-subtle);
}

.comparison-slider-wrapper {
  max-width: 720px;
  margin: var(--space-4) auto 0;
  position: relative;
  border-radius: var(--radius-inset);
  overflow: hidden;
  border: 1px solid var(--color-border-subtle);
  user-select: none;
}

.slider-container {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  cursor: ew-resize;
}

.slider-img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.slider-img-after-wrap {
  position: absolute;
  top: 0;
  left: 0;
  width: 50%;
  height: 100%;
  overflow: hidden;
  border-right: 2px solid #fff;
}

.slider-img-after-wrap .slider-img {
  width: 720px;
  max-width: none;
}

.slider-handle {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 40px;
  height: 40px;
  background: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #0f172a;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
  pointer-events: auto;
  cursor: grab;
  z-index: 10;
}

.slider-handle:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 3px;
}

.slider-badge-before, .slider-badge-after {
  position: absolute;
  bottom: var(--space-3);
  padding: 4px 10px;
  background: rgba(15, 23, 42, 0.85);
  color: #fff;
  border-radius: var(--radius-pill);
  font-size: 11px;
  font-weight: 700;
  z-index: 5;
}

.slider-badge-before { right: var(--space-3); }
.slider-badge-after { left: var(--space-3); color: #34d399; }

/* Table Wrapper */
.table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-inset);
  border: 1px solid var(--color-border-card);
  background: var(--color-bg-card);
  margin-top: var(--space-4);
}

.benchmark-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: var(--text-xs);
}

.benchmark-table th, .benchmark-table td {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border-subtle);
}

.benchmark-table th {
  background: var(--color-bg-inset);
  font-weight: 700;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  font-size: 10px;
  letter-spacing: 0.05em;
}

.highlight-row {
  background: var(--color-primary-light);
  font-weight: 600;
}

.check-green { color: #047857; font-weight: bold; }
.cross-red { color: #e11d48; }

/* Guide & Tutorial Cards */
.guide-section {
  padding: var(--space-10) 0;
  border-top: 1px solid var(--color-border-subtle);
}

.guides-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-4);
  margin-top: var(--space-4);
}

.guide-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-card);
  border-radius: var(--radius-surface);
  padding: var(--space-5);
  box-shadow: var(--shadow-subtle);
}

.guide-tag {
  font-size: 11px;
  font-weight: 800;
  color: #065f46;
  background: #ecfdf5;
  border: 1px solid #a7f3d0;
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-2);
  display: inline-block;
}

[data-theme="dark"] .guide-tag {
  color: #34d399;
  background: rgba(16, 185, 129, 0.15);
  border-color: rgba(16, 185, 129, 0.3);
}

.guide-title {
  font-size: var(--text-base);
  font-weight: 700;
  margin-bottom: var(--space-2);
}

.guide-steps {
  list-style: none;
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.guide-steps li {
  position: relative;
  padding-left: var(--space-4);
}

.guide-steps li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: bold;
}

/* Minimalist Accordion FAQ */
.faq-section {
  padding: var(--space-10) 0;
  border-top: 1px solid var(--color-border-subtle);
}

.faq-list {
  max-width: 760px;
  margin: var(--space-4) auto 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.faq-item {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-card);
  border-radius: var(--radius-control);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-question {
  width: 100%;
  padding: var(--space-4) var(--space-5);
  background: none;
  border: none;
  text-align: left;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-text-main);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-3);
}

.faq-chevron {
  width: 18px;
  height: 18px;
  color: var(--color-text-muted);
  transition: transform var(--transition-fast);
  flex-shrink: 0;
}

.faq-item.open .faq-chevron {
  transform: rotate(180deg);
  color: var(--color-primary);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 250ms ease, padding 250ms ease;
  padding: 0 var(--space-5);
  color: var(--color-text-secondary);
  font-size: var(--text-xs);
  line-height: 1.6;
}

.faq-item.open .faq-answer {
  max-height: 300px;
  padding-bottom: var(--space-4);
}

/* Minimalist Footer */
.site-footer {
  border-top: 1px solid var(--color-border-subtle);
  background: var(--color-bg-subtle);
  padding: var(--space-10) 0 var(--space-6);
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
}

.footer-col-title {
  font-weight: 800;
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #0f172a;
  margin-bottom: var(--space-3);
}

[data-theme="dark"] .footer-col-title {
  color: #f8fafc;
}

.footer-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.footer-bottom-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-weight: 600;
  transition: color var(--transition-fast);
}

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

.code-highlight {
  color: #065f46;
  background: #ecfdf5;
  border: 1px solid #a7f3d0;
  padding: 2px 7px;
  border-radius: 4px;
  font-weight: 800;
  font-family: var(--font-mono);
}

[data-theme="dark"] .code-highlight {
  color: #34d399;
  background: rgba(16, 185, 129, 0.15);
  border-color: rgba(16, 185, 129, 0.3);
}

.format-card-action {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: var(--text-xs);
  color: #065f46;
  font-weight: 700;
  transition: transform var(--transition-fast);
}

[data-theme="dark"] .format-card-action {
  color: #34d399;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-3);
  padding-top: var(--space-4);
}

/* Toast */
.toast-notice {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-subtle);
  color: var(--color-text-main);
  padding: 12px 18px;
  border-radius: var(--radius-surface);
  font-size: var(--text-xs);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  box-shadow: var(--shadow-float);
  transform: translateY(100px);
  opacity: 0;
  transition: transform var(--transition-base), opacity var(--transition-base);
  z-index: 1000;
}

.toast-notice.show {
  transform: translateY(0);
  opacity: 1;
}

/* iPhone Mobile Responsiveness */
@media (max-width: 640px) {
  .nav-links {
    display: none;
  }
  .converter-card {
    padding: var(--space-4);
    border-radius: var(--radius-inset);
  }
  .dropzone {
    padding: var(--space-6) var(--space-3);
  }
  .btn-upload {
    width: 100%;
    justify-content: center;
  }
  .btn-sample {
    width: 100%;
    justify-content: center;
  }
  .preset-pills {
    grid-template-columns: 1fr 1fr;
  }
  .toggle-group {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-3);
  }
  .slider-img-after-wrap .slider-img {
    width: 100vw;
  }
}

/* ==========================================================================
   FORMAT CONVERTER SELECTOR (HEIC -> JPG, PNG, WEBP, ETC.)
   ========================================================================== */

.format-switcher-container {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-bottom: var(--space-4);
  position: relative;
  z-index: 60;
}

.format-switcher-bar {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  position: relative;
}

.format-pill-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-width: 110px;
  padding: 10px 22px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-pill);
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text-main);
  cursor: pointer;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
  transition: all var(--transition-fast);
  user-select: none;
}

.format-pill-btn:hover {
  border-color: var(--color-border-hover);
  background: var(--color-bg-inset);
  transform: translateY(-1px);
}

.format-pill-btn.active,
.format-pill-btn.dropdown-open {
  border-color: #3b82f6;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.format-pill-arrow {
  color: var(--color-text-muted);
  transition: transform var(--transition-fast);
}

.format-pill-btn.dropdown-open .format-pill-arrow {
  transform: rotate(180deg);
}

.format-switcher-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  font-size: 18px;
}

/* Floating Format Dropdown Menu */
.format-popover {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  width: 320px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-surface);
  padding: 16px;
  box-shadow: var(--shadow-float);
  display: none;
  animation: popoverFadeIn 0.18s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  z-index: 100;
}

.format-popover.show {
  display: block;
}

@keyframes popoverFadeIn {
  from {
    opacity: 0;
    transform: translateY(-6px) scale(0.97);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.format-popover-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.format-popover-item {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 12px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-pill);
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-main);
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
}

.format-popover-item:hover {
  background: var(--color-bg-inset);
  border-color: var(--color-border-hover);
  transform: translateY(-1px);
}

.format-popover-item.selected {
  border-color: #3b82f6;
  color: #2563eb;
  background: rgba(59, 130, 246, 0.08);
  font-weight: 700;
}