/* ===== MULTI TIMER STYLES - 체크리스트 100% 준수 구현 ===== */

/* Category Color System - 체크리스트 필수 6가지 색상 */
:root {
  --category-work: #3b82f6;      /* 업무 - 파란색 */
  --category-study: #10b981;     /* 공부 - 초록색 */
  --category-exercise: #f59e0b;  /* 운동 - 주황색 */
  --category-cooking: #ef4444;   /* 요리 - 빨간색 */
  --category-break: #8b5cf6;     /* 휴식 - 보라색 */
  --category-other: #6b7280;     /* 기타 - 회색 */
  
  --category-work-light: #dbeafe;
  --category-study-light: #d1fae5;
  --category-exercise-light: #fed7aa;
  --category-cooking-light: #fecaca;
  --category-break-light: #ddd6fe;
  --category-other-light: #f3f4f6;
  
}

/* Light mode (default) */
:root, [data-theme="light"] {
  --timer-surface-color: white;
  --timer-bg-subtle: var(--gray-50);
  --timer-bg-hover: var(--gray-100);
  --timer-text-primary: var(--gray-900);
  --timer-text-secondary: var(--gray-600);
  --timer-border-color: var(--gray-300);
}

/* Dark mode */
[data-theme="dark"] {
  --timer-surface-color: var(--gray-800);
  --timer-bg-subtle: var(--gray-700);
  --timer-bg-hover: var(--gray-600);
  --timer-text-primary: var(--gray-100);
  --timer-text-secondary: var(--gray-400);
  --timer-border-color: var(--gray-600);
}

/* Multi Timer Container - 사이드바 레이아웃 완전 제거 */
.multi-timer-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-4);
}

/* Breadcrumb - 체크리스트 요구사항 */
.breadcrumb {
  background: var(--timer-bg-subtle);
  border-bottom: 1px solid var(--timer-border-color);
  padding: var(--space-4) 0;
  margin-bottom: var(--space-6);
}

.breadcrumb-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.breadcrumb-path a {
  color: var(--timer-text-secondary);
  text-decoration: none;
}

.breadcrumb-path a:hover {
  color: var(--primary-blue);
}

.favorite-btn {
  background: none;
  border: none;
  font-size: var(--text-base);
  cursor: pointer;
  opacity: 0.6;
  transition: var(--transition-fast);
}

.favorite-btn:hover {
  opacity: 1;
  transform: scale(1.1);
}

/* Controls Bar - 체크리스트 필수 구성요소 */
.controls-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-4);
  background: var(--timer-surface-color);
  border-radius: var(--radius-lg);
  border: 1px solid var(--timer-border-color);
  box-shadow: var(--shadow-sm);
  margin-bottom: var(--space-6);
  flex-wrap: wrap;
  gap: var(--space-4);
}

.control-buttons {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.control-btn {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-4);
  border: 1px solid var(--timer-border-color);
  border-radius: var(--radius-md);
  background: var(--timer-surface-color);
  color: var(--timer-text-primary);
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition-fast);
}

.control-btn:hover {
  background: var(--timer-bg-hover);
  transform: translateY(-1px);
}

.control-btn.primary {
  background: var(--primary-blue);
  color: white;
  border-color: var(--primary-blue);
}

.control-btn.primary:hover {
  background: #1d4ed8;
}

.control-btn.secondary {
  background: var(--timer-bg-subtle);
}

.timer-stats {
  display: flex;
  gap: var(--space-4);
  font-size: var(--text-sm);
  color: var(--timer-text-secondary);
}

.stat-item {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.stat-value {
  font-weight: 700;
  color: var(--primary-blue);
}

/* Timers Grid - 핵심! 체크리스트 필수 구조 (절대 변경 금지!) */
.timers-grid {
  display: grid;
  grid-template-columns: repeat(3, 320px);
  gap: var(--space-4);
  justify-content: center;
  max-width: 1020px; /* 320px * 3 + 20px * 2 */
  margin: var(--space-4) auto;
  padding: 0 var(--space-4);
  position: relative;
}

/* 반응형 그리드 - 체크리스트 요구사항 */
/* 태블릿: 2-Column */
@media (max-width: 1023px) {
  .timers-grid {
    grid-template-columns: repeat(2, 320px);
    max-width: 680px; /* 320px * 2 + 20px * 1 */
  }
}

/* 모바일: 1-Column */
@media (max-width: 767px) {
  .timers-grid {
    grid-template-columns: 320px;
    max-width: 320px;
  }
}

/* 작은 모바일: 카드 크기 조정 */
@media (max-width: 360px) {
  .timers-grid {
    grid-template-columns: 1fr;
    max-width: 100%;
    padding: 0 10px;
  }
}

/* Empty State */
.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: var(--space-12);
  background: var(--timer-surface-color);
  border-radius: var(--radius-lg);
  border: 2px dashed var(--timer-border-color);
}

.empty-icon {
  font-size: 4rem;
  margin-bottom: var(--space-4);
  opacity: 0.6;
}

.empty-title {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--timer-text-primary);
  margin-bottom: var(--space-2);
}

.empty-description {
  color: var(--timer-text-secondary);
  margin-bottom: var(--space-6);
  line-height: 1.6;
}

/* Timer Card - 체크리스트 정확한 구조 (320px × 330px) */
.timer-card {
  width: 320px;
  height: 330px;
  background: var(--timer-surface-color);
  border-radius: var(--radius-lg);
  border: 2px solid var(--timer-border-color);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: all var(--transition-normal);
  position: relative;
  display: flex;
  flex-direction: column;
}

/* Category-based card styling */
.timer-card.timer-work { border-color: var(--category-work); }
.timer-card.timer-study { border-color: var(--category-study); }
.timer-card.timer-exercise { border-color: var(--category-exercise); }
.timer-card.timer-cooking { border-color: var(--category-cooking); }
.timer-card.timer-break { border-color: var(--category-break); }
.timer-card.timer-other { border-color: var(--category-other); }

.timer-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

/* Running state with category colors */
.timer-card.running.timer-work { box-shadow: 0 0 0 3px var(--category-work-light); }
.timer-card.running.timer-study { box-shadow: 0 0 0 3px var(--category-study-light); }
.timer-card.running.timer-exercise { box-shadow: 0 0 0 3px var(--category-exercise-light); }
.timer-card.running.timer-cooking { box-shadow: 0 0 0 3px var(--category-cooking-light); }
.timer-card.running.timer-break { box-shadow: 0 0 0 3px var(--category-break-light); }
.timer-card.running.timer-other { box-shadow: 0 0 0 3px var(--category-other-light); }

.timer-card.completed {
  opacity: 0.8;
  background: linear-gradient(135deg, var(--timer-surface-color) 0%, var(--timer-bg-subtle) 100%);
}

.timer-card.paused {
  opacity: 0.9;
}

/* Timer Header (40px) - 체크리스트 필수 구조 */
.timer-header {
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-2);
  border-bottom: 1px solid var(--timer-border-color);
  background: var(--timer-bg-subtle);
  gap: var(--space-1);
  flex-shrink: 0;
}

.timer-name {
  border: none;
  background: transparent;
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--timer-text-primary);
  padding: 6px var(--space-2);
  border-radius: var(--radius-sm);
  transition: var(--transition-fast);
  flex: 1;
  min-width: 0;
  max-width: 160px;
}

.timer-name:focus {
  outline: none;
  background: var(--timer-surface-color);
  box-shadow: 0 0 0 1px var(--primary-blue);
}

.timer-category {
  padding: 6px 8px;
  font-size: var(--text-base);
  border: 1px solid var(--timer-border-color);
  border-radius: var(--radius-sm);
  background: var(--timer-surface-color);
  color: var(--timer-text-secondary);
  cursor: pointer;
  min-width: 70px;
}

.copy-btn, .delete-btn {
  background: none;
  border: none;
  padding: 6px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 16px;
  opacity: 0.7;
  transition: var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 28px;
  height: 28px;
}

.copy-btn:hover, .delete-btn:hover {
  opacity: 1;
  background: var(--timer-bg-hover);
  transform: scale(1.1);
}

.delete-btn:hover {
  background: #fecaca;
  color: var(--error);
}

.timer-actions {
  display: flex;
  gap: var(--spacing-xs);
}

.timer-action-btn {
  background: none;
  border: none;
  padding: var(--spacing-xs);
  border-radius: var(--border-radius-small);
  cursor: pointer;
  font-size: var(--font-size-medium);
  opacity: 0.7;
  transition: var(--transition-fast);
}

.timer-action-btn:hover {
  opacity: 1;
  background: var(--background-hover);
}

.delete-btn:hover {
  background: var(--error-color-light);
}

/* Timer Display (120px) - 체크리스트 필수 구조 */
.timer-display {
  height: 120px;
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--timer-bg-subtle);
  position: relative;
  flex-shrink: 0;
}

.timer-circle {
  position: relative;
  width: 80px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-1);
}

/* SVG 원형 타이머 - 체크리스트 필수 */
.progress-ring {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.progress-ring-circle {
  fill: none;
  stroke: var(--timer-border-color);
  stroke-width: 4;
  transition: stroke-dashoffset 1s ease;
}

/* Category-based progress colors */
.timer-work .progress-ring-circle { stroke: var(--category-work); }
.timer-study .progress-ring-circle { stroke: var(--category-study); }
.timer-exercise .progress-ring-circle { stroke: var(--category-exercise); }
.timer-cooking .progress-ring-circle { stroke: var(--category-cooking); }
.timer-break .progress-ring-circle { stroke: var(--category-break); }
.timer-other .progress-ring-circle { stroke: var(--category-other); }

.timer-time {
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--timer-text-primary);
  font-variant-numeric: tabular-nums;
  z-index: 2;
  position: relative;
  text-align: center;
  line-height: 1;
}

.timer-status {
  font-size: var(--text-base);
  color: var(--timer-text-secondary);
  text-align: center;
  margin-top: 4px;
  font-weight: 600;
}

/* 진행률 바 - 체크리스트 필수 */
.progress-bar {
  width: 100%;
  height: 6px;
  background: var(--timer-border-color);
  border-radius: 3px;
  overflow: hidden;
  position: relative;
  margin-top: var(--space-1);
}

.progress-fill {
  height: 100%;
  background: var(--primary-blue);
  border-radius: 3px;
  transition: width 1s ease;
  width: 0%;
}

.progress-text {
  position: absolute;
  top: 50%;
  right: 6px;
  transform: translateY(-50%);
  font-size: var(--text-xs);
  color: var(--timer-text-secondary);
  font-weight: 600;
  background: var(--timer-surface-color);
  padding: 1px 3px;
  border-radius: 2px;
  opacity: 0.9;
}

/* Category-based progress bar colors */
.timer-work .progress-fill { background: var(--category-work); }
.timer-study .progress-fill { background: var(--category-study); }
.timer-exercise .progress-fill { background: var(--category-exercise); }
.timer-cooking .progress-fill { background: var(--category-cooking); }
.timer-break .progress-fill { background: var(--category-break); }
.timer-other .progress-fill { background: var(--category-other); }

/* Timer Input (60px) - 체크리스트 필수 구조 */
.timer-input {
  height: 60px;
  padding: var(--space-2);
  border-top: 1px solid var(--timer-border-color);
  border-bottom: 1px solid var(--timer-border-color);
  background: var(--timer-surface-color);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  flex-shrink: 0;
}

.time-inputs {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-size: var(--text-base);
  color: var(--timer-text-secondary);
  font-weight: 600;
}

.time-inputs input {
  width: 55px;
  padding: 6px 8px;
  border: 1px solid var(--timer-border-color);
  border-radius: var(--radius-sm);
  text-align: center;
  font-size: var(--text-base);
  background: var(--timer-surface-color);
  color: var(--timer-text-primary);
  font-weight: 600;
}

/* 프리셋 버튼들 - 체크리스트 필수 [5분][10분][15분][30분] */
.preset-buttons {
  display: flex;
  gap: 2px;
  justify-content: center;
}

.preset-btn {
  padding: 6px 10px;
  font-size: var(--text-sm);
  border: 1px solid var(--timer-border-color);
  border-radius: var(--radius-sm);
  background: var(--timer-bg-subtle);
  color: var(--timer-text-secondary);
  cursor: pointer;
  transition: var(--transition-fast);
  font-weight: 600;
}

.preset-btn:hover {
  background: #dbeafe;
  color: var(--primary-blue);
  border-color: var(--primary-blue);
}

/* Timer Controls (40px) - 체크리스트 필수 구조 */
.timer-controls {
  height: 40px;
  padding: var(--space-1) var(--space-2);
  border-top: 1px solid var(--timer-border-color);
  background: var(--timer-surface-color);
  display: flex;
  gap: var(--space-1);
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.start-btn, .stop-btn, .reset-btn {
  padding: 8px 14px;
  font-size: var(--text-base);
  border: 1px solid var(--timer-border-color);
  border-radius: var(--radius-sm);
  background: var(--timer-surface-color);
  color: var(--timer-text-secondary);
  cursor: pointer;
  transition: var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
}

.start-btn:hover {
  background: var(--success);
  color: white;
  border-color: var(--success);
}

.reset-btn:hover {
  background: var(--timer-bg-hover);
  color: var(--timer-text-primary);
}

/* Advanced Settings (40px, 접이식) - 체크리스트 필수 */
.advanced-settings {
  border-top: 1px solid var(--timer-border-color);
  background: var(--timer-bg-subtle);
  flex-shrink: 0;
}

.advanced-settings summary {
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  color: var(--timer-text-secondary);
  cursor: pointer;
  list-style: none;
  user-select: none;
  font-weight: 500;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.advanced-settings summary:hover {
  background: var(--timer-bg-hover);
  color: var(--timer-text-primary);
}

.dropdown-arrow {
  transition: transform var(--transition-fast);
  font-size: var(--text-xs);
}

.advanced-settings[open] .dropdown-arrow {
  transform: rotate(180deg);
}

.advanced-settings[open] summary {
  border-bottom: 1px solid var(--timer-border-color);
}

.advanced-settings summary::-webkit-details-marker {
  display: none;
}

.settings-content {
  padding: var(--space-3);
  border-top: 1px solid var(--timer-border-color);
  font-size: var(--text-sm);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  background: var(--timer-surface-color);
}

.setting-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--timer-text-secondary);
  cursor: pointer;
  font-weight: 500;
}

.setting-item input[type="checkbox"] {
  width: 16px;
  height: 16px;
  cursor: pointer;
}

.repeat-setting {
  font-size: var(--text-sm);
  color: var(--timer-text-secondary);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 500;
}

.repeat-count {
  width: 40px;
  padding: 4px 6px;
  border: 1px solid var(--timer-border-color);
  border-radius: var(--radius-sm);
  text-align: center;
  font-size: var(--text-sm);
  background: var(--timer-surface-color);
  color: var(--timer-text-primary);
}

/* Timer Stats (30px) - 체크리스트 필수 */
.timer-stats {
  height: 30px;
  padding: var(--space-2) var(--space-3);
  background: var(--timer-bg-subtle);
  border-top: 1px solid var(--timer-border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--text-xs);
  color: var(--timer-text-secondary);
  flex-shrink: 0;
  font-weight: 500;
}

.completed-count, .remaining-repeats {
  font-weight: 600;
  color: var(--timer-text-primary);
}

/* Ad Section - 체크리스트 요구사항 */
.ad-section {
  display: flex;
  justify-content: center;
  margin: var(--space-6) 0;
}

.ad-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--timer-bg-subtle);
  border: 1px solid var(--timer-border-color);
  border-radius: var(--radius-md);
  color: var(--timer-text-secondary);
  font-size: var(--text-sm);
  padding: var(--space-6);
  width: 300px;
  height: 250px;
}

/* Button Styles */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition-fast);
  text-decoration: none;
}

.btn-primary {
  background: var(--primary-blue);
  color: white;
  border-color: var(--primary-blue);
}

.btn-primary:hover {
  background: #1d4ed8;
  border-color: #1d4ed8;
}

.btn-icon {
  font-size: var(--text-base);
}

.btn-text {
  line-height: 1;
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: var(--spacing-xxl);
  background: var(--surface-color);
  border-radius: var(--border-radius-large);
  border: 2px dashed var(--border-color);
}

.empty-icon {
  font-size: 4rem;
  margin-bottom: var(--spacing-medium);
  opacity: 0.6;
}

.empty-title {
  font-size: var(--font-size-large);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  margin-bottom: var(--spacing-small);
}

.empty-description {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-large);
  line-height: 1.6;
}

/* Management Settings */
.management-settings {
  margin-bottom: var(--spacing-large);
}

.settings-accordion {
  background: var(--surface-color);
  border-radius: var(--border-radius-large);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-light);
}

.settings-summary {
  padding: var(--spacing-medium);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--spacing-small);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  transition: var(--transition-fast);
}

.settings-summary:hover {
  background: var(--background-hover);
}

.settings-summary::-webkit-details-marker {
  display: none;
}

.summary-icon {
  font-size: var(--font-size-large);
}

.summary-text {
  flex: 1;
}

.summary-arrow {
  transition: var(--transition-fast);
}

.settings-accordion[open] .summary-arrow {
  transform: rotate(180deg);
}

.settings-content {
  padding: 0 var(--spacing-medium) var(--spacing-medium);
  border-top: 1px solid var(--border-color);
}

.settings-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-large);
  margin-bottom: var(--spacing-medium);
}

.setting-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-medium);
}

.setting-title {
  font-size: var(--font-size-medium);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  margin: 0;
}

.control-buttons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-small);
}

.notification-settings {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-small);
}

.setting-label {
  display: flex;
  align-items: center;
  gap: var(--spacing-small);
  font-size: var(--font-size-small);
  color: var(--text-secondary);
}

.label-text {
  flex: 1;
}

.setting-select {
  padding: var(--spacing-xs) var(--spacing-small);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-small);
  background: var(--surface-color);
  color: var(--text-primary);
  cursor: pointer;
}

.volume-slider {
  flex: 1;
  margin: 0 var(--spacing-small);
}

.btn-small {
  padding: var(--spacing-xs) var(--spacing-small);
  font-size: var(--font-size-small);
}

.auto-settings {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-small);
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: var(--spacing-small);
  cursor: pointer;
  font-size: var(--font-size-small);
  color: var(--text-secondary);
}

.checkbox-label input[type="checkbox"] {
  appearance: none;
  width: 16px;
  height: 16px;
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius-small);
  position: relative;
  cursor: pointer;
  transition: var(--transition-fast);
}

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

.checkbox-label input[type="checkbox"]:checked::after {
  content: '✓';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: white;
  font-size: 10px;
  font-weight: bold;
}

/* Sidebar */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-large);
}

.sidebar-title {
  font-size: var(--font-size-medium);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  margin: 0 0 var(--spacing-medium) 0;
}

/* Ad Spaces - 설계문서 광고 영역 */
.ad-space {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--background-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-medium);
  margin: var(--spacing-medium) 0;
}

.ad-sidebar {
  height: 250px;
  width: 300px;
}

.ad-native {
  height: 280px;
  width: 336px;
  max-width: 100%;
  margin: var(--spacing-large) auto;
}

.ad-footer {
  height: 90px;
  width: 728px;
  max-width: 100%;
  margin: var(--spacing-large) auto 0;
}

.ad-placeholder {
  color: var(--text-secondary);
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-medium);
}

/* Quick Add Section */
.quick-add-section {
  background: var(--surface-color);
  padding: var(--spacing-medium);
  border-radius: var(--border-radius-large);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-light);
}

.quick-add-buttons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-small);
  margin-bottom: var(--spacing-medium);
}

.quick-add-btn {
  padding: var(--spacing-small);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-medium);
  background: var(--background-subtle);
  color: var(--text-secondary);
  font-size: var(--font-size-small);
  cursor: pointer;
  transition: var(--transition-fast);
  text-align: center;
}

.quick-add-btn:hover {
  background: var(--primary-color-light);
  color: var(--primary-color);
  border-color: var(--primary-color);
}

.btn-full {
  width: 100%;
}

/* Related Tools */
.related-tools {
  background: var(--surface-color);
  padding: var(--spacing-medium);
  border-radius: var(--border-radius-large);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-light);
}

.tool-links {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-small);
}

.tool-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-small);
  padding: var(--spacing-small);
  border-radius: var(--border-radius-medium);
  text-decoration: none;
  color: var(--text-secondary);
  transition: var(--transition-fast);
}

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

.tool-icon {
  font-size: var(--font-size-medium);
}

.tool-name {
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-medium);
}

/* Usage Guide */
.usage-guide {
  background: var(--surface-color);
  padding: var(--spacing-large);
  border-radius: var(--border-radius-large);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-light);
  margin-bottom: var(--spacing-large);
}

.guide-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  margin: 0 0 var(--spacing-large) 0;
}

.guide-steps {
  margin-bottom: var(--spacing-large);
}

.guide-step {
  display: flex;
  gap: var(--spacing-medium);
  margin-bottom: var(--spacing-large);
}

.step-number {
  font-size: var(--font-size-large);
  flex-shrink: 0;
}

.step-content {
  flex: 1;
}

.step-title {
  font-size: var(--font-size-medium);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  margin: 0 0 var(--spacing-xs) 0;
}

.step-description {
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0;
}

.tips-title {
  font-size: var(--font-size-medium);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  margin: 0 0 var(--spacing-medium) 0;
}

.tips-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.tips-list li {
  padding: var(--spacing-small) 0;
  color: var(--text-secondary);
  line-height: 1.6;
}

.tips-list strong {
  color: var(--text-primary);
}

/* Modal Styles */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background: var(--surface-color);
  border-radius: var(--border-radius-large);
  box-shadow: var(--shadow-large);
  width: 90%;
  max-width: 500px;
  max-height: 90vh;
  overflow: hidden;
  transform: scale(0.9);
  transition: transform var(--transition-normal);
}

.modal-overlay.active .modal-content {
  transform: scale(1);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-medium);
  border-bottom: 1px solid var(--border-color);
}

.modal-title {
  font-size: var(--font-size-large);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  margin: 0;
}

.modal-close {
  background: none;
  border: none;
  font-size: var(--font-size-xl);
  cursor: pointer;
  color: var(--text-secondary);
  padding: var(--spacing-xs);
  border-radius: var(--border-radius-small);
  transition: var(--transition-fast);
}

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

.modal-body {
  padding: var(--spacing-medium);
}

.form-group {
  margin-bottom: var(--spacing-medium);
}

.form-label {
  display: block;
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-medium);
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.form-input,
.form-select {
  width: 100%;
  padding: var(--spacing-small);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-medium);
  background: var(--surface-color);
  color: var(--text-primary);
  font-size: var(--font-size-medium);
  transition: var(--transition-fast);
}

.form-input:focus,
.form-select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 2px var(--primary-color-light);
}

.time-setting {
  display: flex;
  align-items: center;
  gap: var(--spacing-small);
}

.time-separator {
  color: var(--text-secondary);
  font-weight: var(--font-weight-medium);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: var(--spacing-small);
  padding: var(--spacing-medium);
  border-top: 1px solid var(--border-color);
  background: var(--background-subtle);
}

/* Notification Styles */
.notification-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 1100;
  max-width: 400px;
}

.notification {
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-medium);
  box-shadow: var(--shadow-large);
  padding: var(--spacing-medium);
  margin-bottom: var(--spacing-small);
  transform: translateX(100%);
  transition: transform var(--transition-normal);
}

.notification.show {
  transform: translateX(0);
}

.notification.success {
  border-left: 4px solid var(--success-color);
}

.notification.error {
  border-left: 4px solid var(--error-color);
}

.notification.warning {
  border-left: 4px solid var(--warning-color);
}

/* Responsive Design */
@media (max-width: 1024px) {
  .content-with-sidebar {
    grid-template-columns: 1fr;
    gap: var(--spacing-medium);
  }
  
  .sidebar {
    order: -1;
  }
  
  .ad-sidebar {
    width: 100%;
    max-width: 300px;
    margin: 0 auto;
  }
}

@media (max-width: 768px) {
  .multi-timer-header {
    padding: var(--spacing-medium);
  }
  
  .timer-status-summary {
    flex-direction: column;
    gap: var(--spacing-medium);
  }
  
  .multi-timer-controls {
    flex-direction: column;
  }
  
  .timers-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-medium);
  }
  
  .settings-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-medium);
  }
  
  .control-buttons {
    grid-template-columns: 1fr;
  }
  
  .quick-add-buttons {
    grid-template-columns: 1fr;
  }
  
  .ad-footer {
    width: 320px;
    height: 50px;
  }
}

@media (max-width: 480px) {
  .page-layout {
    padding: var(--spacing-medium) 0;
  }
  
  .multi-timer-header {
    padding: var(--spacing-small);
  }
  
  .page-title {
    font-size: var(--font-size-xl);
  }
  
  .time-inputs {
    flex-direction: column;
    gap: var(--spacing-small);
  }
  
  .control-buttons {
    flex-direction: column;
  }
  
  .control-buttons .btn {
    width: 100%;
  }
  
  .empty-state {
    padding: var(--spacing-large);
  }
  
  .empty-icon {
    font-size: 3rem;
  }
  
  .notification-container {
    top: 10px;
    right: 10px;
    left: 10px;
    max-width: none;
  }
}

/* Print Styles */
@media print {
  .ad-space,
  .sidebar,
  .multi-timer-controls,
  .timer-actions,
  .notification-container {
    display: none !important;
  }
  
  .content-with-sidebar {
    grid-template-columns: 1fr;
  }
  
  .timer-card {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid #000;
  }
}