/* ==========================================================================
   Design System & Custom Properties
   ========================================================================== */

:root {
  /* Common variables */
  --font-title: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  
  --grad-primary: linear-gradient(135deg, #FF9900 0%, #FF5500 50%, #8A2387 100%);
  --grad-hover: linear-gradient(135deg, #FFaa33 0%, #FF7733 50%, #a03ca2 100%);
  
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: all 0.15s ease;
  
  --radius-lg: 20px;
  --radius-md: 12px;
  --radius-sm: 8px;
  
  /* Dark Theme Default */
  --bg-app: #0a0b0e;
  --bg-card: rgba(20, 22, 28, 0.65);
  --bg-card-hover: rgba(26, 29, 36, 0.8);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(255, 153, 0, 0.5);
  
  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
  --text-inverse: #0a0b0e;
  
  --input-bg: rgba(10, 11, 14, 0.6);
  --shadow-main: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
  --shadow-glow: 0 0 20px rgba(255, 153, 0, 0.15);
  
  --badge-bg: rgba(255, 153, 0, 0.15);
  --badge-text: #FF9900;
  
  --toast-bg: rgba(20, 22, 28, 0.9);
  --danger-color: #ef4444;
  --danger-bg: rgba(239, 68, 68, 0.1);
  --success-color: #10b981;
}

/* Light Theme Variables */
body.light-theme {
  --bg-app: #f3f4f7;
  --bg-card: rgba(255, 255, 255, 0.75);
  --bg-card-hover: rgba(255, 255, 255, 0.9);
  --border-color: rgba(0, 0, 0, 0.08);
  --border-focus: rgba(255, 153, 0, 0.6);
  
  --text-main: #1f2937;
  --text-muted: #6b7280;
  --text-inverse: #ffffff;
  
  --input-bg: rgba(255, 255, 255, 0.9);
  --shadow-main: 0 8px 32px 0 rgba(31, 38, 135, 0.08);
  --shadow-glow: 0 0 20px rgba(255, 153, 0, 0.1);
  
  --badge-bg: rgba(255, 153, 0, 0.1);
  --badge-text: #e67e00;
  
  --toast-bg: rgba(255, 255, 255, 0.95);
  --danger-color: #dc2626;
  --danger-bg: rgba(220, 38, 38, 0.08);
}

/* ==========================================================================
   Basic Reset & Layouts
   ========================================================================== */

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

body {
  font-family: var(--font-body);
  background-color: var(--bg-app);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  overflow-x: hidden;
  transition: background-color 0.5s ease, color 0.3s ease;
}

/* 背景装飾のぼかしオーブ */
.decorations {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  overflow: hidden;
  z-index: -1;
  pointer-events: none;
}

.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.15;
  transition: var(--transition-smooth);
}

.orb-1 {
  width: 400px;
  height: 400px;
  background: #FF9900;
  top: -100px;
  right: -50px;
}

.orb-2 {
  width: 450px;
  height: 450px;
  background: #8A2387;
  bottom: -150px;
  left: -100px;
}

body.light-theme .orb-1 {
  opacity: 0.1;
  background: #FF9900;
}

body.light-theme .orb-2 {
  opacity: 0.08;
  background: #c05cdb;
}

.app-container {
  width: 100%;
  max-width: 720px;
  padding: 24px 16px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* ==========================================================================
   Header Styling
   ========================================================================== */

.app-header {
  text-align: center;
  position: relative;
  padding: 12px 0;
}

.logo-area {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 8px;
}

.logo-icon {
  width: 32px;
  height: 32px;
  stroke: #FF9900;
  animation: float 4s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-6px) rotate(5deg); }
}

.app-header h1 {
  font-family: var(--font-title);
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-main);
  margin: 0;
}

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

.subtitle {
  font-size: 0.95rem;
  color: var(--text-muted);
  font-weight: 400;
}

/* テーマ切り替えボタン */
.theme-toggle-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  backdrop-filter: blur(8px);
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-smooth);
  box-shadow: var(--shadow-main);
}

.theme-toggle-btn:hover {
  transform: scale(1.08) rotate(15deg);
  border-color: var(--border-focus);
}

.theme-toggle-btn svg {
  width: 20px;
  height: 20px;
  position: absolute;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.3s ease;
}

.sun-icon {
  opacity: 0;
  transform: rotate(90deg);
}

.moon-icon {
  opacity: 1;
  transform: rotate(0);
}

body.light-theme .sun-icon {
  opacity: 1;
  transform: rotate(0);
}

body.light-theme .moon-icon {
  opacity: 0;
  transform: rotate(-90deg);
}

/* ==========================================================================
   Card Styling (Glassmorphism)
   ========================================================================== */

.card {
  background: var(--bg-card);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-main);
  padding: 28px;
  transition: var(--transition-smooth);
}

.card:hover {
  box-shadow: var(--shadow-main), var(--shadow-glow);
}

.main-card {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* ==========================================================================
   Form Fields
   ========================================================================== */

.input-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.field-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-title);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-main);
  letter-spacing: 0.02em;
}

.badge {
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 20px;
  background-color: var(--badge-bg);
  color: var(--badge-text);
  font-weight: 500;
}

.textarea-wrapper {
  position: relative;
  display: flex;
}

textarea {
  width: 100%;
  background-color: var(--input-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-main);
  padding: 14px 44px 14px 14px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  line-height: 1.5;
  resize: none;
  outline: none;
  transition: var(--transition-smooth);
}

textarea:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(255, 153, 0, 0.15);
}

.icon-btn-inline {
  position: absolute;
  right: 12px;
  top: 14px;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-fast);
  opacity: 0.7;
}

.icon-btn-inline:hover {
  background-color: rgba(255, 255, 255, 0.1);
  color: var(--text-main);
  opacity: 1;
}

body.light-theme .icon-btn-inline:hover {
  background-color: rgba(0, 0, 0, 0.05);
}

/* Option group styling */
.options-group {
  border-top: 1px dashed var(--border-color);
  padding-top: 16px;
}

.toggle-option {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.option-info {
  flex: 1;
  min-width: 200px;
}

.option-title {
  display: block;
  font-family: var(--font-title);
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 2px;
}

.option-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.text-input {
  width: 180px;
  background-color: var(--input-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  padding: 10px 12px;
  font-family: var(--font-body);
  font-size: 0.9rem;
  outline: none;
  transition: var(--transition-smooth);
}

.text-input:focus {
  border-color: var(--border-focus);
  width: 220px; /* フォーカス時に少し広がるモダンなインタラクション */
}

@media (max-width: 480px) {
  .text-input {
    width: 100%;
  }
  .text-input:focus {
    width: 100%;
  }
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.actions-area {
  display: flex;
  margin-top: 4px;
}

.primary-btn {
  width: 100%;
  background: var(--grad-primary);
  color: #ffffff; /* 常に反転カラー (白) */
  border: none;
  border-radius: var(--radius-md);
  padding: 14px 24px;
  font-family: var(--font-title);
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  box-shadow: 0 4px 15px rgba(255, 102, 0, 0.3);
  transition: var(--transition-smooth);
}

.primary-btn:hover {
  background: var(--grad-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(255, 102, 0, 0.4);
}

.primary-btn:active {
  transform: translateY(1px);
}

.primary-btn svg {
  width: 20px;
  height: 20px;
  transition: transform 0.3s ease;
}

.primary-btn:hover svg {
  transform: translateX(4px);
}

.text-btn {
  background: none;
  border: none;
  font-family: var(--font-title);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: var(--transition-fast);
}

.text-btn.danger {
  color: var(--danger-color);
}

.text-btn.danger:hover {
  background-color: var(--danger-bg);
}

.text-btn svg {
  width: 14px;
  height: 14px;
}

/* ==========================================================================
   Result Box
   ========================================================================== */

.result-box {
  background: rgba(255, 153, 0, 0.05);
  border: 1px solid rgba(255, 153, 0, 0.2);
  border-radius: var(--radius-md);
  padding: 16px;
  margin-top: 8px;
  animation: slideDown 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

.result-header {
  margin-bottom: 10px;
}

.result-title {
  font-family: var(--font-title);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--badge-text);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.result-body {
  display: flex;
  gap: 12px;
  align-items: center;
}

.result-url-wrapper {
  flex: 1;
}

#result-url {
  width: 100%;
  background: var(--input-bg);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  outline: none;
  cursor: text;
}

.result-actions {
  display: flex;
  gap: 8px;
}

.action-btn {
  height: 42px;
  padding: 0 16px;
  border-radius: var(--radius-sm);
  font-family: var(--font-title);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
  transition: var(--transition-fast);
}

.copy-btn-main {
  background: var(--text-main);
  color: var(--text-inverse);
  border: 1px solid var(--text-main);
}

.copy-btn-main:hover {
  background: transparent;
  color: var(--text-main);
}

.open-btn-main {
  background: transparent;
  color: var(--text-main);
  border: 1px solid var(--border-color);
}

.open-btn-main:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--text-main);
}

body.light-theme .open-btn-main:hover {
  background: rgba(0, 0, 0, 0.03);
}

.action-btn svg {
  width: 16px;
  height: 16px;
}

@media (max-width: 580px) {
  .result-body {
    flex-direction: column;
    align-items: stretch;
  }
  .result-actions {
    justify-content: flex-end;
  }
}

/* ==========================================================================
   Error & Banners
   ========================================================================== */

.error-banner {
  background: var(--danger-bg);
  border: 1px solid rgba(239, 68, 68, 0.2);
  color: var(--danger-color);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.85rem;
  font-weight: 500;
  animation: shake 0.4s ease;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-5px); }
  75% { transform: translateX(5px); }
}

.error-banner svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.hide {
  display: none !important;
}

/* ==========================================================================
   History Section
   ========================================================================== */

.history-card {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.history-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.history-header h2 {
  font-family: var(--font-title);
  font-size: 1.15rem;
  font-weight: 700;
}

.no-history-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
  text-align: center;
  color: var(--text-muted);
  gap: 12px;
}

.no-history-state svg {
  width: 48px;
  height: 48px;
  stroke: var(--text-muted);
  opacity: 0.4;
}

.no-history-state p {
  font-size: 0.85rem;
}

.history-list {
  list-style: none;
  max-height: 280px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-right: 4px;
}

.history-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  gap: 16px;
  transition: var(--transition-smooth);
}

body.light-theme .history-item {
  background: rgba(0, 0, 0, 0.01);
}

.history-item:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-focus);
  transform: translateX(4px);
}

.history-info {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
  min-width: 0;
}

.history-asin-badge {
  display: flex;
  align-items: center;
  gap: 8px;
}

.asin-tag {
  font-family: var(--font-title);
  font-size: 0.7rem;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: 4px;
  background: var(--badge-bg);
  color: var(--badge-text);
}

.history-time {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.history-url {
  font-size: 0.85rem;
  font-weight: 500;
  text-decoration: none;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: var(--transition-fast);
}

.history-url:hover {
  color: #FF9900;
  text-decoration: underline;
}

.history-actions {
  display: flex;
  gap: 6px;
}

.icon-btn {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  background: var(--input-bg);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-fast);
}

.icon-btn:hover {
  color: var(--text-main);
  border-color: var(--text-main);
}

.icon-btn.delete-btn:hover {
  color: var(--danger-color);
  border-color: var(--danger-color);
  background: var(--danger-bg);
}

.icon-btn svg {
  width: 15px;
  height: 15px;
}

/* ==========================================================================
   Scrollbar & Utilities
   ========================================================================== */

.scrollbar::-webkit-scrollbar {
  width: 6px;
}

.scrollbar::-webkit-scrollbar-track {
  background: transparent;
}

.scrollbar::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 10px;
}

.scrollbar::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* ==========================================================================
   Toast Notification System
   ========================================================================== */

.toast-container {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 9999;
  pointer-events: none;
}

.toast {
  background: var(--toast-bg);
  border: 1px solid var(--border-color);
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: 40px;
  padding: 10px 20px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-main);
  font-family: var(--font-title);
  font-size: 0.85rem;
  font-weight: 600;
  pointer-events: auto;
  animation: toastIn 0.35s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards,
             toastOut 0.3s cubic-bezier(0.6, -0.28, 0.735, 0.045) 2.5s forwards;
}

body.light-theme .toast {
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.08);
}

.toast svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.toast.toast-success svg {
  color: var(--success-color);
}

.toast.toast-error svg {
  color: var(--danger-color);
}

@keyframes toastIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes toastOut {
  from { opacity: 1; transform: translateY(0) scale(1); }
  to { opacity: 0; transform: translateY(-10px) scale(0.9); }
}

/* ==========================================================================
   Footer
   ========================================================================== */

.app-footer {
  text-align: center;
  padding: 12px 0;
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.disclaimer {
  display: block;
  margin-top: 4px;
  opacity: 0.7;
}

/* kotetsu.tech 共通デザイン */
body.dark-theme,body.light-theme{--grad-primary:linear-gradient(135deg,#3b82f6 0%,#2563eb 100%);--grad-hover:linear-gradient(135deg,#2563eb 0%,#1d4ed8 100%);--border-focus:#2563eb99;--badge-bg:#2563eb16;--badge-text:#2563eb;--shadow-glow:0 0 20px #2563eb18}
body{display:block;background:linear-gradient(135deg,#e0f2fe 0,#f8fafc 42%,#f0fdf4 100%);font-family:"Noto Sans JP","Yu Gothic","Hiragino Sans",sans-serif}.kotetsu-nav{width:100%;position:sticky;top:0;z-index:100;background:#fff;box-shadow:0 2px 10px #0000001a}.kotetsu-nav__inner{width:min(1000px,calc(100% - 40px));height:60px;margin:auto;display:flex;align-items:center;justify-content:space-between}.kotetsu-nav a{display:flex;align-items:center;gap:8px;color:#2c3e50;text-decoration:none;font-size:.92rem;font-weight:700}.kotetsu-nav a:hover{color:#2563eb}.kotetsu-nav__brand{color:#2563eb!important}.app-container{margin:0 auto;padding-top:42px;padding-bottom:0}.app-header h1{font-family:inherit;color:#0f172a}.gradient-text{background:linear-gradient(135deg,#2563eb,#0284c7);-webkit-background-clip:text;background-clip:text}.logo-icon{stroke:#2563eb}.card{border:1px solid #e2e8f0;background:#fffffff2;box-shadow:0 10px 25px -5px #0000000d}.primary-btn{box-shadow:0 4px 15px #2563eb4d}.result-box{background:#eff6ff;border-color:#bfdbfe}.app-footer{margin-top:20px;padding:25px 16px;color:#cbd5e1;background:#2c3e50}.decorations .orb-1{background:#60a5fa}.decorations .orb-2{background:#4ade80}@media(max-width:520px){.kotetsu-nav__brand{font-size:.78rem}.app-container{padding-top:28px}}