/* ============================================
   SNSizer - Premium Light Theme
   ============================================ */

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

:root {
  --bg:          #f4f6fb;
  --bg-2:        #eef1f8;
  --surface:     #ffffff;
  --surface-hov: #f8f9ff;
  --border:      #e2e6f0;
  --border-hov:  #b8c0d8;
  --text:        #1a1f36;
  --text-muted:  #6b7280;
  --text-light:  #9ca3af;
  --accent-1:    #7c3aed;
  --accent-2:    #db2777;
  --grad: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  --radius:      14px;
  --radius-sm:   8px;
  --shadow-sm:   0 1px 4px rgba(0,0,0,0.06), 0 2px 12px rgba(0,0,0,0.05);
  --shadow:      0 4px 24px rgba(0,0,0,0.08), 0 1px 4px rgba(0,0,0,0.04);
  --shadow-lg:   0 8px 40px rgba(0,0,0,0.12);
  --font: 'Inter', 'Noto Sans JP', sans-serif;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* --- Ambient Glows --- */
.bg-glow {
  position: fixed;
  border-radius: 50%;
  filter: blur(140px);
  pointer-events: none;
  z-index: 0;
  opacity: 0.12;
}
.bg-glow-1 {
  width: 700px; height: 700px;
  background: var(--accent-1);
  top: -250px; left: -200px;
}
.bg-glow-2 {
  width: 600px; height: 600px;
  background: var(--accent-2);
  bottom: -200px; right: -200px;
}

/* --- Layout --- */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* --- Header --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(244,246,251,0.88);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 14px 0;
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}
.logo-icon-wrap {
  width: 36px; height: 36px;
  background: linear-gradient(135deg, rgba(124,58,237,0.1), rgba(219,39,119,0.1));
  border: 1px solid rgba(124,58,237,0.2);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
}
.logo-text {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.5px;
}
.logo-accent {
  background: var(--grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.header-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  color: var(--text-muted);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 99px;
  padding: 5px 14px;
  box-shadow: var(--shadow-sm);
}
.badge-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: #22c55e;
  animation: pulse-dot 2s infinite;
  flex-shrink: 0;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.4; }
}

/* --- Hero --- */
.hero {
  padding: 72px 0 48px;
  text-align: center;
  position: relative;
  z-index: 1;
}
.hero-title {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  letter-spacing: -1.5px;
  line-height: 1.15;
  color: var(--text);
  margin-bottom: 16px;
}
.hero-title span {
  background: var(--grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-sub {
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 460px;
  margin: 0 auto;
  line-height: 1.8;
}

/* --- Main Content --- */
.main-content { padding: 8px 0 100px; }

/* --- Step Section --- */
.step-section {
  margin-bottom: 48px;
  animation: fadeUp 0.4s ease both;
}
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}
.hidden { display: none !important; }

.step-header {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 20px;
}
.step-num {
  width: 42px; height: 42px;
  flex-shrink: 0;
  border-radius: 12px;
  background: var(--grad);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 1px;
  color: #fff;
  box-shadow: 0 4px 14px rgba(124,58,237,0.3);
}
.step-num.done {
  background: linear-gradient(135deg, #22c55e, #16a34a);
  box-shadow: 0 4px 14px rgba(34,197,94,0.3);
}
.step-title {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.3px;
  margin-bottom: 3px;
  color: var(--text);
}
.step-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* --- SNS Grid --- */
.sns-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(128px, 1fr));
  gap: 12px;
}
.sns-card {
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 12px 16px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.sns-card:hover {
  border-color: var(--border-hov);
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}
.sns-card.selected {
  border-color: var(--accent-1);
  background: rgba(124,58,237,0.05);
  box-shadow: 0 0 0 3px rgba(124,58,237,0.15), var(--shadow);
}
.sns-card-icon-wrap {
  width: 52px;
  height: 44px;
  margin: 0 auto 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.sns-card-img {
  max-width: 52px;
  max-height: 44px;
  width: auto;
  height: auto;
  object-fit: contain;
  display: block;
}
.sns-card-icon {
  font-size: 2rem;
  display: block;
  line-height: 1;
}
.sns-card-svg-icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(124,58,237,0.08), rgba(219,39,119,0.08));
  border: 1px solid rgba(124,58,237,0.18);
  display: flex;
  align-items: center;
  justify-content: center;
}
.sns-card-name {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text);
}
.sns-card-check {
  position: absolute;
  top: 8px; right: 8px;
  width: 20px; height: 20px;
  border-radius: 50%;
  background: var(--grad);
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  color: #fff;
  box-shadow: 0 2px 8px rgba(124,58,237,0.4);
}
.sns-card.selected .sns-card-check { display: flex; }

/* --- Size Grid --- */
.size-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 10px;
}
.size-btn {
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  text-align: left;
  cursor: pointer;
  transition: all 0.18s ease;
  color: var(--text);
  box-shadow: var(--shadow-sm);
}
.size-btn:hover {
  border-color: var(--border-hov);
  box-shadow: var(--shadow);
  transform: translateY(-1px);
}
.size-btn.selected {
  border-color: var(--accent-1);
  background: rgba(124,58,237,0.05);
  box-shadow: 0 0 0 3px rgba(124,58,237,0.15);
}
.size-btn-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 5px;
}
.size-btn-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
}
.size-badge {
  font-size: 0.65rem;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 99px;
  background: var(--grad);
  color: #fff;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  flex-shrink: 0;
  white-space: nowrap;
}
.size-btn-dim {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}
.size-btn-circle {
  font-size: 0.72rem;
  color: var(--accent-1);
  margin-top: 4px;
  font-weight: 500;
}

/* --- Target Info Bar --- */
.target-info {
  display: flex;
  align-items: center;
  gap: 10px;
  background: rgba(124,58,237,0.06);
  border: 1px solid rgba(124,58,237,0.18);
  border-radius: var(--radius-sm);
  padding: 11px 16px;
  margin-bottom: 20px;
  font-size: 0.875rem;
  flex-wrap: wrap;
}
.target-info .ti-sns  { font-weight: 700; color: var(--text); }
.target-info .ti-arrow { color: var(--text-light); }
.target-info .ti-size { color: var(--accent-1); font-weight: 600; font-variant-numeric: tabular-nums; }
.target-info .ti-edit {
  margin-left: auto;
  font-size: 0.78rem;
  color: var(--text-muted);
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 2px;
}
.target-info .ti-edit:hover { color: var(--accent-1); }

/* --- Upload Zone --- */
.upload-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 52px 24px;
  text-align: center;
  transition: all 0.2s ease;
  background: var(--surface);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
}
.upload-zone:hover, .upload-zone.drag-over {
  border-color: var(--accent-1);
  background: rgba(124,58,237,0.03);
}
.upload-zone.drag-over {
  transform: scale(1.01);
  box-shadow: 0 0 0 4px rgba(124,58,237,0.12), var(--shadow);
}
.upload-inner { pointer-events: none; }
.upload-icon-wrap { margin-bottom: 18px; }
.upload-main-text {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}
.upload-or {
  font-size: 0.85rem;
  color: var(--text-light);
  margin-bottom: 14px;
}
.upload-formats {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 14px;
}
.upload-formats strong { color: var(--accent-1); }

/* --- File List --- */
.file-list {
  margin-top: 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.file-item {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  animation: fadeUp 0.25s ease both;
  box-shadow: var(--shadow-sm);
}
.file-thumb {
  width: 48px; height: 48px;
  border-radius: 6px;
  object-fit: cover;
  background: var(--bg-2);
  flex-shrink: 0;
  border: 1px solid var(--border);
}
.file-info { flex: 1; min-width: 0; }
.file-name {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.file-meta {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 2px;
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}
.file-dim {
  color: var(--text-light);
  font-variant-numeric: tabular-nums;
}
.file-dim::before { content: '·'; margin-right: 6px; }
.file-tag {
  font-size: 0.68rem;
  font-weight: 700;
  padding: 2px 9px;
  border-radius: 99px;
  background: rgba(234,179,8,0.12);
  color: #b45309;
  border: 1px solid rgba(234,179,8,0.3);
  flex-shrink: 0;
}
.file-remove {
  background: none;
  border: none;
  color: var(--text-light);
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
  padding: 4px;
  transition: color 0.15s;
  flex-shrink: 0;
}
.file-remove:hover { color: #ef4444; }

/* --- Settings --- */
.settings-row {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}
.setting-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 18px 20px;
  flex: 1;
  min-width: 200px;
  box-shadow: var(--shadow-sm);
}
.setting-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-bottom: 12px;
}
.format-buttons {
  display: flex;
  gap: 8px;
}
.fmt-btn {
  flex: 1;
  padding: 9px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border);
  background: transparent;
  color: var(--text-muted);
  font-size: 0.875rem;
  font-weight: 600;
  font-family: var(--font);
  cursor: pointer;
  transition: all 0.18s;
}
.fmt-btn:hover { border-color: var(--border-hov); color: var(--text); background: var(--bg-2); }
.fmt-btn.active {
  background: var(--grad);
  border-color: transparent;
  color: #fff;
  box-shadow: 0 2px 12px rgba(124,58,237,0.3);
}
.quality-slider {
  width: 100%;
  accent-color: var(--accent-1);
  margin-top: 4px;
  cursor: pointer;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 24px;
  border-radius: var(--radius-sm);
  font-size: 0.925rem;
  font-weight: 600;
  font-family: var(--font);
  cursor: pointer;
  border: none;
  transition: all 0.2s ease;
  text-decoration: none;
}
.btn-primary {
  background: var(--grad);
  color: #fff;
  box-shadow: 0 4px 18px rgba(124,58,237,0.3);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(124,58,237,0.4);
}
.btn-outline {
  background: var(--surface);
  color: var(--text);
  border: 1.5px solid var(--border);
  box-shadow: var(--shadow-sm);
  pointer-events: auto;
}
.btn-outline:hover {
  border-color: var(--border-hov);
  background: var(--bg-2);
  box-shadow: var(--shadow);
}
.btn-ghost {
  background: var(--surface);
  color: var(--text-muted);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}
.btn-ghost:hover { background: var(--bg-2); color: var(--text); }
.btn-convert {
  width: 100%;
  justify-content: center;
  padding: 16px;
  font-size: 1rem;
  letter-spacing: 0.3px;
}
.btn-sm { padding: 7px 14px; font-size: 0.8rem; }

/* --- Results --- */
.results-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}
.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}
.result-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  animation: fadeUp 0.3s ease both;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s, box-shadow 0.2s;
}
.result-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}
.result-preview {
  width: 100%;
  object-fit: cover;
  display: block;
}
.result-preview.circle-preview {
  border-radius: 50%;
  width: 88px; height: 88px;
  display: block;
  margin: 24px auto 0;
  border: 3px solid var(--border);
}
.result-preview-wrap {
  background: var(--bg-2);
  min-height: 130px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.result-info { padding: 14px 16px; }
.result-filename {
  font-size: 0.83rem;
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 5px;
}
.result-meta { font-size: 0.75rem; color: var(--text-muted); margin-bottom: 10px; }
.result-sizes {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.72rem;
  margin-bottom: 12px;
  color: var(--text-muted);
}
.size-before, .size-after {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  padding: 3px 8px;
  border-radius: 99px;
  font-variant-numeric: tabular-nums;
}
.size-before { background: var(--bg-2); color: var(--text-muted); border: 1px solid var(--border); }
.size-after  { background: rgba(34,197,94,0.1); color: #16a34a; border: 1px solid rgba(34,197,94,0.25); }

/* --- Loading Overlay --- */
.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(244,246,251,0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
}
.loading-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 44px 52px;
  text-align: center;
  min-width: 300px;
  box-shadow: var(--shadow-lg);
}
.loading-spinner {
  width: 44px; height: 44px;
  border: 3px solid var(--border);
  border-top-color: var(--accent-1);
  border-radius: 50%;
  animation: spin 0.75s linear infinite;
  margin: 0 auto 20px;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading-label {
  font-weight: 700;
  font-size: 1rem;
  color: var(--text);
  margin-bottom: 6px;
}
.loading-sub {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 20px;
  min-height: 1.2em;
}
.progress-track {
  width: 100%;
  height: 5px;
  background: var(--bg-2);
  border-radius: 99px;
  overflow: hidden;
}
.progress-bar {
  height: 100%;
  background: var(--grad);
  border-radius: 99px;
  transition: width 0.3s ease;
  width: 0%;
}

/* --- Footer --- */
.site-footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 36px 0;
  text-align: center;
  position: relative;
  z-index: 1;
}
.footer-logo {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 8px;
  letter-spacing: -0.3px;
}
.footer-logo span {
  background: var(--grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.footer-copy { font-size: 0.78rem; color: var(--text-muted); }

/* --- Crop Button (file-item内) --- */
.file-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}
.file-rotate-btns {
  display: flex;
  gap: 4px;
  flex-shrink: 0;
}
.file-rotate-btn {
  background: none;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1rem;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all 0.18s;
}
.file-rotate-btn:hover { border-color: var(--accent-1); color: var(--accent-1); background: rgba(124,58,237,0.06); }

.file-crop-btn {
  background: none;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--accent-1);
  cursor: pointer;
  font-size: 0.72rem;
  font-weight: 700;
  font-family: var(--font);
  padding: 4px 10px;
  white-space: nowrap;
  flex-shrink: 0;
  transition: all 0.18s;
}
.file-crop-btn:hover { background: rgba(124,58,237,0.06); border-color: var(--accent-1); }
.file-crop-btn.cropped { color: #16a34a; border-color: #86efac; background: rgba(34,197,94,0.06); }

/* --- Crop Modal --- */
.crop-modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(26,31,54,0.65);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}
.crop-modal-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  max-width: 760px;
  width: 100%;
  max-height: 90vh;
  overflow: hidden;
}
.crop-modal-header {
  padding: 20px 24px 16px;
  border-bottom: 1px solid var(--border);
}
.crop-modal-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 4px;
}
.crop-modal-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
}
.crop-canvas-wrap {
  flex: 1;
  overflow: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: var(--bg-2);
}
#cropCanvas {
  display: block;
  max-width: 100%;
  cursor: crosshair;
  border-radius: 4px;
  box-shadow: 0 2px 16px rgba(0,0,0,0.15);
}
.crop-modal-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--border);
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  background: var(--surface);
}

/* --- Toggle Row (チェックボックス付き行) --- */
.toggle-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 12px;
  cursor: pointer;
  width: fit-content;
}
.toggle-row input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--accent-1);
  cursor: pointer;
  flex-shrink: 0;
}
.toggle-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  user-select: none;
}
.toggle-row:hover .toggle-label { color: var(--text); }

/* --- Color Name Tag --- */
.color-name-tag {
  display: inline-block;
  margin-left: 8px;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 99px;
  background: rgba(124,58,237,0.08);
  color: var(--accent-1);
  border: 1px solid rgba(124,58,237,0.2);
  vertical-align: middle;
  text-transform: none;
  letter-spacing: 0;
}

/* --- Convert Button: disabled state --- */
.btn-convert:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: none !important;
}
.convert-warning {
  display: block;
  font-size: 0.78rem;
  color: #ef4444;
  margin-top: 10px;
  text-align: center;
  min-height: 1.2em;
}

/* --- Resize Mode / Background Color --- */
.bg-color-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.color-presets {
  display: flex;
  gap: 6px;
  align-items: center;
  flex-wrap: wrap;
}
.color-preset {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s;
  font-size: 0.8rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.color-preset:hover { transform: scale(1.18); box-shadow: 0 2px 8px rgba(0,0,0,0.15); }
.color-preset.active { box-shadow: 0 0 0 3px var(--accent-1); }
.transparent-preset {
  background: repeating-conic-gradient(#ccc 0% 25%, #fff 0% 50%) 0 0 / 10px 10px;
  color: #888;
  font-size: 1rem;
  border: 1.5px solid #ccc;
}
.hex-input-wrap {
  display: flex;
  align-items: center;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  gap: 2px;
}
.hex-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  white-space: nowrap;
  margin-right: 4px;
}
.hex-hash {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-family: monospace;
}
.hex-input {
  border: none;
  outline: none;
  font-size: 0.875rem;
  font-family: monospace;
  width: 72px;
  color: var(--text);
  background: transparent;
  text-transform: uppercase;
}
.hex-input:focus { outline: none; }

/* --- Footer Nav --- */
.footer-nav {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin: 12px 0;
}
.footer-nav a {
  font-size: 0.78rem;
  color: var(--text-muted);
  text-decoration: none;
}
.footer-nav a:hover { color: var(--accent-1); text-decoration: underline; text-underline-offset: 2px; }

/* --- How To Section --- */
.howto-section {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 72px 0 80px;
  position: relative;
  z-index: 1;
}
.howto-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 44px;
}
.howto-title {
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--text);
  margin-bottom: 14px;
}
.howto-lead {
  font-size: 0.925rem;
  color: var(--text-muted);
  line-height: 1.8;
}
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
  margin-bottom: 52px;
}
.feature-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  box-shadow: var(--shadow-sm);
}
.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(124,58,237,0.08), rgba(219,39,119,0.08));
  border: 1px solid rgba(124,58,237,0.18);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  flex-shrink: 0;
}
.feature-title {
  font-size: 0.975rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}
.feature-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.75;
}
.howto-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}
.howto-subtitle {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}
.howto-steps {
  padding-left: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.howto-steps li {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.7;
  padding-left: 6px;
}
.howto-steps li strong { color: var(--text); }
.howto-sns-text {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.8;
}

/* --- Policy Pages --- */
.policy-section {
  padding: 56px 0 100px;
  position: relative;
  z-index: 1;
}
.policy-content {
  max-width: 720px;
  margin: 0 auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 48px 52px;
  box-shadow: var(--shadow-sm);
}
.policy-h1 {
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: -0.4px;
  color: var(--text);
  margin-bottom: 6px;
}
.policy-updated {
  font-size: 0.78rem;
  color: var(--text-light);
  margin-bottom: 28px;
}
.policy-content h2 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin: 32px 0 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}
.policy-content p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 10px;
}
.policy-content ul, .policy-content ol {
  padding-left: 20px;
  margin-bottom: 10px;
}
.policy-content li {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 4px;
}
.policy-content a {
  color: var(--accent-1);
  text-underline-offset: 2px;
}
.policy-content a:hover { opacity: 0.8; }
.policy-contact { margin-top: 8px; }
.policy-placeholder {
  font-style: italic;
  color: var(--accent-2);
  background: rgba(219,39,119,0.06);
  border-radius: 4px;
  padding: 1px 6px;
  font-size: 0.85rem;
}
.policy-back {
  margin-top: 40px;
  padding-top: 28px;
  border-top: 1px solid var(--border);
}

/* --- Contact Form --- */
.contact-form { display: flex; flex-direction: column; gap: 20px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-label {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.6px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.form-required {
  font-size: 0.65rem;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: 99px;
  background: rgba(219,39,119,0.1);
  color: var(--accent-2);
  border: 1px solid rgba(219,39,119,0.2);
  text-transform: none;
  letter-spacing: 0;
}
.form-input, .form-textarea {
  width: 100%;
  padding: 11px 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.925rem;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  transition: border-color 0.18s, box-shadow 0.18s;
  outline: none;
}
.form-input:focus, .form-textarea:focus {
  border-color: var(--accent-1);
  box-shadow: 0 0 0 3px rgba(124,58,237,0.12);
  background: var(--surface);
}
.form-textarea { resize: vertical; min-height: 140px; line-height: 1.7; }
.form-error {
  font-size: 0.85rem;
  color: #ef4444;
  background: rgba(239,68,68,0.07);
  border: 1px solid rgba(239,68,68,0.2);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
}
.form-success {
  text-align: center;
  padding: 40px 20px;
}
.form-success-icon {
  width: 56px; height: 56px;
  border-radius: 50%;
  background: linear-gradient(135deg, #22c55e, #16a34a);
  color: #fff;
  font-size: 1.6rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  box-shadow: 0 4px 16px rgba(34,197,94,0.3);
}
.form-success h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}
.form-success p {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* --- Lightbox --- */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 300;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
.lightbox-overlay {
  position: absolute;
  inset: 0;
  background: rgba(10,10,20,0.85);
  backdrop-filter: blur(6px);
}
.lightbox-img {
  position: relative;
  max-width: 90vw;
  max-height: 90vh;
  object-fit: contain;
  border-radius: var(--radius);
  box-shadow: 0 24px 80px rgba(0,0,0,0.5);
}
.lightbox-close {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.25);
  color: #fff;
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.18s;
}
.lightbox-close:hover { background: rgba(255,255,255,0.28); }

/* --- Responsive --- */
@media (max-width: 640px) {
  .header-badge span:last-child { display: none; }
  .hero { padding: 48px 0 28px; }
  .sns-grid { grid-template-columns: repeat(auto-fill, minmax(96px, 1fr)); gap: 8px; }
  .size-grid { grid-template-columns: 1fr 1fr; }
  .settings-row { flex-direction: column; }
  .results-grid { grid-template-columns: 1fr 1fr; }
  .results-actions { flex-direction: column; }
  .results-actions .btn { width: 100%; justify-content: center; }
  .loading-box { padding: 32px 24px; min-width: unset; width: 88vw; }
  .howto-section { padding: 48px 0 56px; }
  .howto-body { grid-template-columns: 1fr; gap: 28px; }
  .policy-content { padding: 28px 20px; }
  .file-item { flex-wrap: wrap; }
  .file-info { flex: 1; min-width: 0; }
  .file-actions {
    order: 10;
    width: 100%;
    padding-top: 4px;
    border-top: 1px solid var(--border);
  }
  .file-remove { order: 5; }
}