/* ==========================================================================
   ZeroNoise CSS Design System & Layout
   ========================================================================== */

/* 1. 디자인 토큰 및 변수 선언 (ZeroSlate 라이트 테마 기반) */
:root {
  /* 기본 배경 (아주 밝은 파스텔 블루/그레이) */
  --bg-color: #f1f5f9;
  
  /* 카드 디자인 (완전한 흰색, 은은한 그림자) */
  --card-bg: #ffffff;
  --card-border: rgba(0, 0, 0, 0.05);
  --shadow-premium: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  --blur-amount: 0px; /* 블러 제거 */
  
  /* 타이포그래피 (진한 슬레이트) */
  --text-primary: #1e293b;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  
  /* 포인트 컬러 (제로슬레이트 블루) */
  --primary-color: #3b82f6; 
  --primary-glow: rgba(59, 130, 246, 0.2);
  --secondary-color: #60a5fa;
  --accent-color: #10b981;
  --danger-color: #ef4444;
  
  --font-sans: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

/* 라이트 모드 렌더링 최적화 브라우저 지시어 */
html {
  color-scheme: light;
  scroll-behavior: smooth;
}

/* 기본 레이아웃 리셋 */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  color: var(--text-primary);
  background-color: var(--bg-color);
  height: 100vh;
  width: 100vw;
  overflow: hidden;
  position: relative;
  margin: 0;
  padding: 0;
}


/* 2. 백그라운드 무드 레이어 */
/* 실시간 SVG 노이즈 오버레이 */
.noise-overlay {
  display: none; /* 질감을 깔끔하게 하기 위해 노이즈 제거 */
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  content: "";
  opacity: 0.045;
  pointer-events: none;
  z-index: 9999;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}

/* 무드 조명 궤도 (Glow Orbs) */
.glow-orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(100px);
  z-index: -1;
  opacity: 0.25;
  pointer-events: none;
  mix-blend-mode: screen;
}

.glow-orb-1 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, var(--primary-color) 0%, transparent 80%);
  top: -100px;
  right: -50px;
  animation: floatOrb 12s infinite alternate ease-in-out;
}

.glow-orb-2 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, var(--secondary-color) 0%, transparent 80%);
  bottom: -150px;
  left: -100px;
  animation: floatOrb 16s infinite alternate-reverse ease-in-out;
}

/* 타이머 작동 시 글로우 오브 펄스 효과 */
body.timer-running .glow-orb-1 {
  animation: floatOrb 12s infinite alternate ease-in-out, pulseOrb 4s infinite ease-in-out;
}

body.timer-running .glow-orb-2 {
  animation: floatOrb 16s infinite alternate-reverse ease-in-out, pulseOrb 5s infinite ease-in-out;
}

@keyframes floatOrb {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(40px, 30px) scale(1.15); }
}

@keyframes pulseOrb {
  0%, 100% { opacity: 0.25; transform: scale(1); }
  50% { opacity: 0.45; transform: scale(1.08); filter: blur(85px); }
}

/* 3. 공통 프리미엄 글래스 카드 */
.glass-card {
  background: var(--card-bg);
  backdrop-filter: blur(var(--blur-amount));
  -webkit-backdrop-filter: blur(var(--blur-amount));
  border: 1px solid var(--card-border);
  border-radius: 20px;
  padding: 1.75rem;
  box-shadow: var(--shadow-premium);
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.glass-card:hover {
  border-color: rgba(59, 130, 246, 0.2);
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.025);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.025em;
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-primary);
}

/* 4. 메인 컨테이너 및 슬라이드 레이아웃 */
.app-slider {
  display: flex;
  width: 200vw;
  height: 100vh;
  transition: transform 0.6s cubic-bezier(0.25, 1, 0.5, 1);
  will-change: transform;
}

.page {
  width: 100vw;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 2rem 1rem;
  box-sizing: border-box;
  flex-shrink: 0;
  position: relative;
}

.app-container {
  width: 100%;
  max-width: 1200px;
  height: 100%;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  z-index: 10;
  position: relative;
}

/* 네비게이션 플로팅 버튼 */
.nav-btn {
  position: absolute;
  bottom: 2rem;
  background: rgba(11, 15, 25, 0.6);
  border: 1px solid rgba(0, 242, 254, 0.3);
  color: var(--text-primary);
  padding: 0.75rem 1.25rem;
  border-radius: 30px;
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
  transition: all 0.3s ease;
  z-index: 100;
}

.nav-btn:hover {
  background: rgba(0, 242, 254, 0.1);
  border-color: rgba(0, 242, 254, 0.6);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 242, 254, 0.2);
}

.nav-btn-next {
  right: 2rem;
}

.nav-btn-prev {
  bottom: 2rem;
  left: 2rem;
}


.app-header {
  text-align: center;
  margin-bottom: 0.5rem;
}

.app-header h1 {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, #ffffff 0%, #a5b4fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
}

.logo-icon {
  width: 2.4rem;
  height: 2.4rem;
  border-radius: 12px;
  filter: drop-shadow(0 0 12px rgba(162, 155, 254, 0.3));
  object-fit: cover;
}

.subtitle {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
}

.task-banner {
  margin-top: 1rem;
  padding: 0.5rem 1rem;
  background: rgba(162, 155, 254, 0.15);
  border: 1px solid rgba(162, 155, 254, 0.3);
  border-radius: 20px;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--primary-glow);
  font-weight: 600;
  font-size: 0.9rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  animation: fadeInDown 0.4s ease-out;
}

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

/* 반응형 2단 대시보드 */
.dashboard-grid {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 1.5rem;
  flex: 1;
  min-height: 0;
  overflow: hidden;
}

@media (max-width: 900px) {
  .dashboard-grid {
    grid-template-columns: 1fr;
  }
}

.left-panel {
  display: flex;
  flex-direction: column;
  gap: 0.8rem; /* 줄어든 간격 */
  overflow-y: auto;
  padding-right: 0.5rem;
}

/* 왼쪽 패널의 카드들은 좀 더 날씬하게 */
.left-panel .glass-card {
  padding: 1.1rem 1.25rem;
  border-radius: 16px;
}

/* 왼쪽 패널 커스텀 스크롤바 */
.left-panel::-webkit-scrollbar { width: 4px; }
.left-panel::-webkit-scrollbar-track { background: transparent; }
.left-panel::-webkit-scrollbar-thumb { background: rgba(255, 255, 255, 0.1); border-radius: 4px; }

/* 5. 타이머 컴포넌트 */
.timer-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.timer-settings {
  width: 100%;
  margin-bottom: 1.25rem;
  padding: 0.85rem 1rem;
  background: rgba(255, 255, 255, 0.02);
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.02);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.setting-item {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  text-align: left;
}

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

.setting-label strong {
  color: var(--primary-color);
}

.timer-display-wrapper {
  position: relative;
  width: 200px;
  height: 200px;
  margin: 1rem 0 1.5rem 0;
  display: flex;
  justify-content: center;
  align-items: center;
}

.progress-ring {
  position: absolute;
  top: 0;
  left: 0;
  transform: rotate(-90deg); /* 12시 방향에서 시작하도록 회전 */
}

.progress-ring__circle {
  stroke-dasharray: 534; /* 2 * PI * r (2 * 3.14159 * 85) = ~534 */
  stroke-dashoffset: 534;
  transition: stroke-dashoffset 0.1s linear, stroke 0.3s ease;
  stroke-linecap: round;
  filter: drop-shadow(0 0 6px var(--primary-glow));
}

.timer-text-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  z-index: 2;
}

.timer-time {
  font-family: var(--font-mono);
  font-size: 2.25rem;
  font-weight: 500;
  letter-spacing: -0.02em;
}

.timer-status {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.timer-controls {
  display: flex;
  gap: 0.5rem;
  width: 100%;
}

.timer-controls .btn {
  flex: 1;
}

/* 버튼 컴포넌트 */
.btn {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.75rem 1.25rem;
  border-radius: 12px;
  border: none;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  display: inline-flex;
  justify-content: center;
  align-items: center;
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-primary {
  background: var(--primary-color);
  color: #ffffff;
  box-shadow: 0 4px 14px 0 var(--primary-glow);
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-1px);
  background: var(--secondary-color);
  box-shadow: 0 6px 20px 0 var(--primary-glow);
}

.btn-secondary {
  background: transparent;
  border: 1px solid var(--card-border);
  color: var(--text-primary);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--bg-color);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.btn-outline:hover {
  color: var(--text-primary);
  border-color: var(--primary-color);
  background: rgba(0, 242, 254, 0.05);
}

.btn-sm {
  padding: 0.5rem 0.85rem;
  font-size: 0.8rem;
  border-radius: 8px;
}

.btn-danger-outline {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid rgba(239, 68, 68, 0.2);
}

.btn-danger-outline:hover {
  color: #ffffff;
  background: rgba(239, 68, 68, 0.15);
  border-color: var(--danger-color);
}

/* 6. 사운드스케이프 컴포넌트 */
.audio-main-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.btn-audio-play {
  flex: 0 0 110px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
  padding: 0.75rem 1rem;
  border-radius: 12px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: all 0.2s ease;
}

.btn-audio-play.active {
  background: linear-gradient(135deg, var(--accent-color) 0%, #34d399 100%);
  color: #040814;
  box-shadow: 0 4px 14px 0 rgba(16, 185, 129, 0.3);
  border-color: transparent;
}

.btn-audio-play:hover {
  transform: translateY(-1px);
}

.volume-container {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex: 1;
  background: rgba(255, 255, 255, 0.03);
  padding: 0.6rem 0.85rem;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.03);
}

.volume-icon {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

/* 슬라이더 인풋 스타일링 */
input[type="range"] {
  -webkit-appearance: none;
  width: 100%;
  height: 4px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 2px;
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--primary-color);
  cursor: pointer;
  box-shadow: 0 0 8px var(--primary-glow);
  transition: transform 0.1s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.25);
}

/* 라디오 버튼 그룹 */
.noise-type-selector {
  margin-bottom: 1.25rem;
  padding: 0.75rem 0.85rem;
  background: rgba(255, 255, 255, 0.02);
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.02);
}

.noise-type-selector .label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  display: block;
  margin-bottom: 0.6rem;
}

.radio-group {
  display: flex;
  justify-content: space-between;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.radio-label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.82rem;
  color: var(--text-secondary);
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
}

.radio-label input[type="radio"] {
  display: none;
}

.radio-custom {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid var(--text-muted);
  display: inline-block;
  position: relative;
  transition: all 0.2s ease;
}

.radio-label input[type="radio"]:checked + .radio-custom {
  border-color: var(--primary-color);
}

.radio-label input[type="radio"]:checked + .radio-custom::after {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--primary-color);
  border-radius: 50%;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  box-shadow: 0 0 6px var(--primary-glow);
}

.radio-label input[type="radio"]:checked ~ span {
  color: var(--text-primary);
}

/* 사운드 탭 네비게이션 */
.sound-tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
  padding: 0.25rem;
  background: var(--bg-color);
  border-radius: 12px;
  border: 1px solid var(--card-border);
}

.sound-tab-btn {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.5rem;
  cursor: pointer;
  transition: all 0.2s ease;
  border-radius: 8px;
}

.sound-tab-btn:hover {
  color: var(--text-primary);
}

.sound-tab-btn.active {
  color: var(--primary-color);
  font-weight: 600;
  background: var(--card-bg);
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.sound-page {
  display: none;
  animation: fadeIn 0.3s ease;
}

.sound-page.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(5px); }
  to { opacity: 1; transform: translateY(0); }
}

/* 프리셋 버튼 그룹 */
.preset-buttons {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}

.preset-btn {
  flex: 1;
  min-width: 80px;
}

.sound-category-title {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin: 1.5rem 0 0.75rem 0;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  font-weight: 500;
}

/* 필터 스위치 토글 */
.filter-toggle-container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 0.85rem;
  background: rgba(255, 255, 255, 0.02);
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.02);
}

.sub-slider {
  display: none;
  width: 100%;
  margin-top: 0.25rem;
  height: 2px !important;
}

.sub-slider::-webkit-slider-thumb {
  width: 12px !important;
  height: 12px !important;
}

.filter-toggle-container:has(input[type="checkbox"]:checked) .sub-slider {
  display: block;
  animation: slideDown 0.2s ease forwards;
}

.noise-type-selector:not(:has(input[type="radio"][value="none"]:checked)) .sub-slider {
  display: block;
  animation: slideDown 0.2s ease forwards;
  margin-top: 1rem;
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-5px); }
  to { opacity: 1; transform: translateY(0); }
}

.toggle-switch {
  position: relative;
  display: inline-block;
  width: 38px;
  height: 20px;
  flex-shrink: 0;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  cursor: pointer;
  top: 0; left: 0; right: 0; bottom: 0;
  background-color: rgba(255, 255, 255, 0.1);
  transition: .3s ease;
  border-radius: 20px;
}

.toggle-slider:before {
  position: absolute;
  content: "";
  height: 14px;
  width: 14px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: .3s ease;
  border-radius: 50%;
}

.toggle-switch input:checked + .toggle-slider {
  background-color: var(--primary-color);
  box-shadow: 0 0 8px var(--primary-glow);
}

.toggle-switch input:checked + .toggle-slider:before {
  transform: translateX(18px);
}

.filter-info {
  display: flex;
  flex-direction: column;
}

.filter-title {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-primary);
}

.filter-desc {
  font-size: 0.72rem;
  color: var(--text-muted);
}

/* 7. 젠 라이터 (Zen Writer) */
.editor-card {
  display: flex;
  flex-direction: column;
  height: 100%;
  min-height: 480px;
}

.editor-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  padding-bottom: 0.75rem;
  margin-bottom: 1rem;
}

.editor-actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.editor-body {
  flex: 1;
  position: relative;
  overflow: hidden;
}

/* 몰입형 포커스 에디팅 에리어 */
.zen-editor {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  outline: none;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--text-primary);
  overflow-y: auto;
  padding-right: 0.5rem;
}

/* 커스텀 스크롤바 디자인 */
.zen-editor::-webkit-scrollbar {
  width: 6px;
}

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

.zen-editor::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.08);
  border-radius: 3px;
}

.zen-editor::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.15);
}

/* Placeholder 구현 */
.zen-editor:empty:before {
  content: attr(placeholder);
  color: var(--text-muted);
  pointer-events: none;
  display: block;
}

/* 핵심: 포커스 라인 강조 로직 (JS + CSS 클래스 방식)
   contenteditable 내부의 div들은 :focus-within이 동작하지 않으므로,
   JS에서 커서 위치를 직접 추적하여 .current-line 클래스를 부여합니다. */
.zen-editor.is-focused > div {
  opacity: 0.25;
  filter: blur(0.5px);
  transition: opacity 0.3s ease, filter 0.3s ease;
}

.zen-editor.is-focused > div.current-line {
  opacity: 1;
  filter: blur(0);
}

/* 아직 줄 구분이 없는 단일 줄 상태 지원 */
.zen-editor > div {
  min-height: 1.75em;
  outline: none;
}

.editor-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 0.75rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.stats-counter strong {
  color: var(--primary-color);
  font-family: var(--font-mono);
}

.divider {
  margin: 0 0.5rem;
  color: rgba(255, 255, 255, 0.1);
}

.editor-hint {
  color: var(--text-muted);
  display: none; /* 푸터에 내보내기 버튼이 추가되면서 공간 확보를 위해 숨김 */
}

.export-actions {
  display: flex;
  gap: 0.5rem;
}

.btn-xs {
  padding: 0.25rem 0.5rem;
  font-size: 0.75rem;
  border-radius: 4px;
}

/* 8. 통계 대시보드 카드 */
.stats-card {
  margin-top: 0.5rem;
}

.stats-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

@media (max-width: 650px) {
  .stats-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
}

.stat-item {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.03);
  padding: 1.25rem;
  border-radius: 16px;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  transition: background 0.2s ease;
}

.stat-item:hover {
  background: rgba(255, 255, 255, 0.04);
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.stat-value {
  font-size: 1.75rem;
  font-weight: 700;
  color: #ffffff;
  font-family: var(--font-mono);
}

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

/* 9. 젠 모드 (Zen Mode) 프리미엄 레이아웃 */
.left-panel, .app-header, .stats-card {
  transition: opacity 0.5s cubic-bezier(0.4, 0, 0.2, 1), transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.dashboard-grid {
  transition: grid-template-columns 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.editor-card {
  transition: max-width 0.5s cubic-bezier(0.4, 0, 0.2, 1), margin 0.5s cubic-bezier(0.4, 0, 0.2, 1), border-color 0.3s ease, box-shadow 0.3s ease;
}

body.zen-mode-active {
  overflow: auto; /* 하단 짤림 방지 */
}

body.zen-mode-active .left-panel,
body.zen-mode-active .app-header,
body.zen-mode-active .stats-card,
body.zen-mode-active #btn-goto-stats {
  opacity: 0 !important;
  pointer-events: none;
  transform: translateY(15px);
  display: none !important;
}

body.zen-mode-active .dashboard-grid {
  grid-template-columns: 1fr;
}

body.zen-mode-active .editor-card {
  max-width: 900px;
  margin: 5vh auto;
  min-height: 85vh;
  height: auto;
  box-sizing: border-box;
  border-color: rgba(0, 242, 254, 0.25);
  box-shadow: 0 12px 40px 0 rgba(0, 242, 254, 0.08), var(--shadow-premium);
}

body.zen-mode-active .editor-card .editor-header {
  border-bottom: none;
  opacity: 0.15;
  transition: opacity 0.3s ease;
}

body.zen-mode-active .editor-card .editor-header:hover {
  opacity: 1;
}

body.zen-mode-active .editor-actions button:not(#btn-zen-mode) {
  display: none;
}

body.zen-mode-active .editor-footer {
  opacity: 0.2;
  transition: opacity 0.3s;
}

body.zen-mode-active .editor-footer:hover {
  opacity: 1;
}

/* 9. 보관함 모달 */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  opacity: 1;
  transition: opacity 0.3s ease;
}

.modal-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.modal-content {
  width: 90%;
  max-width: 600px;
  max-height: 80vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 24px 80px rgba(0,0,0,0.4), var(--shadow-premium);
  border-color: rgba(255,255,255,0.1);
  padding: 1.5rem;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 1rem;
  border-bottom: 1px solid rgba(255,255,255,0.05);
  margin-bottom: 1rem;
}

.modal-header h2 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
}

.btn-close {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.5rem;
  cursor: pointer;
  transition: color 0.2s;
  padding: 0;
}

.btn-close:hover {
  color: var(--text-primary);
}

.modal-body {
  overflow-y: auto;
  flex: 1;
  padding-right: 0.5rem;
}

/* 커스텀 스크롤바 (모달용) */
.modal-body::-webkit-scrollbar {
  width: 6px;
}
.modal-body::-webkit-scrollbar-track {
  background: transparent;
}
.modal-body::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 4px;
}

.library-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.library-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem;
  background: rgba(255,255,255,0.03);
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.02);
  transition: all 0.2s ease;
  cursor: pointer;
}

.library-item:hover {
  background: rgba(255,255,255,0.06);
  border-color: rgba(255,255,255,0.1);
  transform: translateY(-2px);
}

.library-item.active {
  border-color: var(--primary-color);
  background: rgba(0, 242, 254, 0.05);
}

.library-item-info {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  overflow: hidden;
  flex: 1;
}

.library-item-title {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.library-item-date {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.btn-delete-note {
  background: none;
  border: none;
  color: #ff4b4b;
  cursor: pointer;
  padding: 0.5rem;
  opacity: 0.5;
  transition: opacity 0.2s;
  font-size: 1.1rem;
}

.btn-delete-note:hover {
  opacity: 1;
}

/* 10. 히트맵 (잔디 심기) */
.heatmap-section {
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.heatmap-title {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
}

.heatmap-container {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  margin-bottom: 0.75rem;
}

.heatmap-cell {
  width: 14px;
  height: 14px;
  border-radius: 3px;
  background-color: rgba(255, 255, 255, 0.05); /* Level 0 */
  transition: all 0.2s ease;
  position: relative;
}

.heatmap-cell[data-level="1"] { background-color: rgba(16, 185, 129, 0.25); }
.heatmap-cell[data-level="2"] { background-color: rgba(16, 185, 129, 0.5); }
.heatmap-cell[data-level="3"] { background-color: rgba(16, 185, 129, 0.75); }
.heatmap-cell[data-level="4"] { background-color: rgba(16, 185, 129, 1); }

.heatmap-cell:hover::after {
  content: attr(title);
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--card-bg);
  color: var(--text-primary);
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 0.7rem;
  white-space: nowrap;
  pointer-events: none;
  z-index: 100;
  margin-bottom: 5px;
  border: 1px solid var(--card-border);
}

.heatmap-legend {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* 11. 심호흡 애니메이션 모달 */
.breathing-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2rem;
}

.breathing-circle {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--primary-color) 0%, transparent 70%);
  opacity: 0.5;
  animation: breathe 8s infinite ease-in-out;
}

@keyframes breathe {
  0%, 100% { transform: scale(1); opacity: 0.3; }
  50% { transform: scale(2.5); opacity: 0.8; }
}

.breathing-text {
  font-size: 1.5rem;
  font-weight: 300;
  letter-spacing: 0.1em;
  color: var(--text-primary);
  text-align: center;
  z-index: 2;
}

/* 12. 이미지 캡처 템플릿 (숨김 처리) */
.export-template {
  position: absolute;
  top: -9999px;
  left: -9999px;
  width: 800px;
  background: linear-gradient(135deg, #1a202c 0%, #0f172a 100%);
  color: #f8fafc;
  padding: 4rem;
  border-radius: 16px;
  font-family: var(--font-sans);
}

.export-content {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

#export-text {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  line-height: 1.8;
  white-space: pre-wrap;
  color: #e2e8f0;
}

.export-watermark {
  align-self: flex-end;
  font-size: 0.85rem;
  color: #64748b;
  font-style: italic;
}

/* ==========================================
   배경 테마 설정 (Background Themes)
   ========================================== */

/* 테마 드롭다운 스타일 */
.theme-dropdown {
  appearance: none;
  -webkit-appearance: none;
  width: 100%;
  padding: 0.8rem 1.2rem;
  background-color: var(--bg-color);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.95rem;
  outline: none;
  cursor: pointer;
  transition: all 0.3s ease;
  /* Dark grey SVG arrow for light theme (fallback is fine) */
  background-image: url("data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%23475569%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2F%3E%3C%2Fsvg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem top 50%;
  background-size: 0.65rem auto;
}
.theme-dropdown:hover, .theme-dropdown:focus {
  background-color: var(--card-bg);
  border-color: var(--primary-color);
}
.theme-dropdown option {
  background: var(--card-bg);
  color: var(--text-primary);
  padding: 0.5rem;
}

/* 전환 효과 추가 */
body {
  transition: background-color 0.8s ease;
}
.background-fx, .bg-orb-1, .bg-orb-2 {
  transition: opacity 1.2s ease, background-image 1.2s ease, filter 1.2s ease;
}

/* 1. 미니멀 다크 (ZeroSlate 다크 모드) */
body.theme-oled {
  --bg-color: #1e293b;
  --card-bg: #0f172a;
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  color-scheme: dark;
}
body.theme-oled .background-fx,
body.theme-oled .bg-orb-1,
body.theme-oled .bg-orb-2 {
  opacity: 0 !important;
}

/* 2. 소프트 웜 (아침 햇살) */
body.theme-forest {
  --bg-color: #fdfbf7; 
  --card-bg: #ffffff;
  --text-primary: #332720;
  --text-secondary: #5e4c40;
  --text-muted: #8c786a;
}
body.theme-forest .background-fx,
body.theme-forest .bg-orb-1,
body.theme-forest .bg-orb-2 {
  opacity: 0 !important;
}

/* 3. 딥 포커스 (미드나잇 블루) */
body.theme-ocean {
  --bg-color: #1e253c;
  --card-bg: rgba(255, 255, 255, 0.05);
  --card-border: rgba(255, 255, 255, 0.08);
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  color-scheme: dark;
}
body.theme-ocean .background-fx,
body.theme-ocean .bg-orb-1,
body.theme-ocean .bg-orb-2 {
  opacity: 0 !important;
}

/* 4. 퓨어 블랙 (OLED 완전 검정) */
body.theme-nature-blur {
  --bg-color: #000000;
  --card-bg: rgba(255, 255, 255, 0.03);
  --card-border: rgba(255, 255, 255, 0.05);
  --text-primary: #ffffff;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;
  color-scheme: dark;
}
body.theme-nature-blur .background-fx,
body.theme-nature-blur .bg-orb-1,
body.theme-nature-blur .bg-orb-2 {
  opacity: 0 !important;
}

/* 5. 하이브리드 (일반: 미드나잇 블루, 젠: 퓨어 블랙) */
body.theme-hybrid {
  --bg-color: #1e253c;
  --card-bg: rgba(255, 255, 255, 0.05);
  --card-border: rgba(255, 255, 255, 0.08);
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  color-scheme: dark;
}
body.theme-hybrid.zen-mode-active {
  --bg-color: #000000;
  --text-primary: #ffffff;
}
body.theme-hybrid.zen-mode-active .background-fx,
body.theme-hybrid.zen-mode-active .bg-orb-1,
body.theme-hybrid.zen-mode-active .bg-orb-2 {
  opacity: 0 !important;
}

/* ==========================================
   카드 접어두기 (Collapsible) UI
   ========================================== */
.collapsible-card .card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  user-select: none;
  width: 100%;
  padding: 0.25rem 0;
}
.collapsible-card .card-title {
  margin-bottom: 0; /* 헤더 안에서는 하단 여백 제거 */
}
.collapse-icon {
  font-size: 0.8rem;
  color: var(--text-muted);
  transition: transform 0.3s ease;
}
/* 닫혔을 때 (collapsed) */
.collapsible-card.collapsed .collapse-icon {
  transform: rotate(-90deg); /* 닫혔음을 표시하는 화살표 방향 */
}
.card-body-wrapper {
  display: grid;
  grid-template-rows: 1fr;
  transition: grid-template-rows 0.3s ease;
}
.collapsible-card.collapsed .card-body-wrapper {
  grid-template-rows: 0fr;
}
.card-body-inner {
  overflow: hidden;
  padding-top: 1.25rem; /* 원래 card-title이 가지고 있던 여백을 여기로 이동 */
}