@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Outfit:wght@500;600;700;800&display=swap');

:root {
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-display: 'Outfit', 'Inter', sans-serif;
  
  /* Color tokens - Light Theme */
  --background: oklch(98% 0 0);
  --foreground: oklch(15% 0 0);
  --card: oklch(100% 0 0);
  --card-foreground: oklch(15% 0 0);
  --border: oklch(92% 0.01 260);
  --input: oklch(90% 0.01 260);
  --muted: oklch(94% 0.01 260);
  --muted-foreground: oklch(50% 0.02 260);
  --primary: oklch(30% 0.05 260);
  --primary-foreground: oklch(98% 0 0);
  --accent: oklch(92% 0.01 260);
  --accent-foreground: oklch(15% 0.01 260);
  --destructive: oklch(55% 0.18 25);
  --destructive-foreground: oklch(98% 0 0);
  --ring: oklch(70% 0.04 260);
  --radius: 1rem;
  --shadow-soft: 0 1px 2px oklch(0% 0 0 / 0.04), 0 6px 20px oklch(0% 0 0 / 0.05);
  
  /* Week Color Definitions - Light Theme */
  --week1: oklch(82% 0.16 90);
  --week1-soft: oklch(96% 0.06 95);
  --week2: oklch(70% 0.15 240);
  --week2-soft: oklch(95% 0.04 240);
  --week3: oklch(66% 0.21 25);
  --week3-soft: oklch(95% 0.04 25);
  --week4: oklch(72% 0.16 155);
  --week4-soft: oklch(95% 0.05 155);
  --week5: oklch(72% 0.18 340);
  --week5-soft: oklch(96% 0.04 340);
  
  --cell-size: 36px;
  --sidebar-width: 280px;
}

.dark {
  /* Color tokens - Dark Theme */
  --background: oklch(14% 0.02 260);
  --foreground: oklch(97% 0 0);
  --card: oklch(19% 0.02 260);
  --card-foreground: oklch(97% 0 0);
  --border: oklch(24% 0.02 260);
  --input: oklch(24% 0.02 260);
  --muted: oklch(24% 0.02 260);
  --muted-foreground: oklch(65% 0.02 260);
  --primary: oklch(98% 0 0);
  --primary-foreground: oklch(15% 0.02 260);
  --accent: oklch(24% 0.02 260);
  --accent-foreground: oklch(97% 0 0);
  --destructive: oklch(45% 0.16 25);
  --destructive-foreground: oklch(98% 0 0);
  --ring: oklch(55% 0.03 260);
  --shadow-soft: 0 4px 20px oklch(0% 0 0 / 0.3);

  /* Week Color Definitions - Dark Theme Soft Overrides */
  --week1-soft: oklch(28% 0.05 90);
  --week2-soft: oklch(26% 0.05 240);
  --week3-soft: oklch(28% 0.06 25);
  --week4-soft: oklch(26% 0.05 155);
  --week5-soft: oklch(28% 0.05 340);
}

/* Global Reset */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  border: 0 solid var(--border);
}

body {
  background-color: var(--background);
  color: var(--foreground);
  font-family: var(--font-sans);
  transition: background-color 0.3s ease, color 0.3s ease;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* Layout Utilities */
.app-container {
  min-height: 100vh;
  padding: 2rem 1.5rem 4rem;
  max-width: 1400px;
  margin: 0 auto;
}

@media (max-width: 640px) {
  .app-container {
    padding: 1rem 0.75rem 2rem;
  }
}

/* Typography */
h1 {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  text-align: center;
  margin: 0.5rem 0;
  transition: transform 0.8s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.8s;
}

h2 {
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted-foreground);
  margin-bottom: 1rem;
}

/* Header */
.app-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
}

.header-top {
  display: flex;
  width: 100%;
  justify-content: space-between;
  align-items: center;
}

.button-group {
  display: flex;
  gap: 0.5rem;
}

/* Button Styles */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.375rem;
  white-space: nowrap;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  border-radius: var(--radius);
  transition: all 0.2s ease;
  user-select: none;
}

.btn-icon {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 50%;
  padding: 0;
}

.btn-outline {
  border: 1px solid var(--border);
  background-color: var(--card);
  color: var(--foreground);
  box-shadow: 0 1px 2px rgba(0,0,0,0.02);
}

.btn-outline:hover {
  background-color: var(--accent);
  color: var(--accent-foreground);
  border-color: var(--border);
}

.btn-sm {
  height: 2rem;
  padding: 0 0.75rem;
  font-size: 0.75rem;
  border-radius: calc(var(--radius) - 4px);
}

.btn-md {
  height: 2.25rem;
  padding: 0 1rem;
}

/* Year Selector */
.year-selector {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.year-display {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  min-width: 80px;
  text-align: center;
  letter-spacing: -0.02em;
}

/* Month Tabs */
.month-tabs {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.375rem;
  width: 100%;
  max-width: 720px;
}

.month-tab {
  border-radius: calc(var(--radius) - 4px);
  padding: 0.375rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  cursor: pointer;
  background-color: transparent;
  color: var(--foreground);
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.month-tab.active {
  color: white;
  box-shadow: 0 4px 12px var(--shadow-color, rgba(0,0,0,0.1));
}

.month-tab:hover:not(.active) {
  background-color: var(--accent);
  color: var(--accent-foreground);
}

.month-summary {
  font-size: 0.875rem;
  color: var(--muted-foreground);
  font-weight: 400;
  text-align: center;
}

/* Cards & Layout */
.dashboard-grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: minmax(0, 1fr) var(--sidebar-width);
}

@media (max-width: 1024px) {
  .dashboard-grid {
    grid-template-columns: 1fr;
  }
}

.card {
  background-color: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  padding: 1rem;
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.card-padding {
  padding: 1.25rem;
}

/* Habit Grid Sheet Table */
.grid-container {
  overflow-x: auto;
  border-radius: calc(var(--radius) - 4px);
  background-color: var(--card);
}

/* Custom Scrollbars */
.grid-container::-webkit-scrollbar {
  height: 8px;
}
.grid-container::-webkit-scrollbar-track {
  background: var(--muted);
  border-radius: 4px;
}
.grid-container::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}
.grid-container::-webkit-scrollbar-thumb:hover {
  background: var(--muted-foreground);
}

.habit-grid {
  display: grid;
  gap: 1px;
  min-width: max-content;
}

.grid-row {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: inherit;
  align-items: center;
  gap: 1px;
  border-bottom: 1px solid var(--border);
}

.grid-row.header-weeks {
  border-bottom: none;
  align-items: flex-end;
  height: 24px;
}

.grid-row.header-days {
  border-bottom: 2px solid var(--border);
  padding-bottom: 0.5rem;
}

.grid-row.habit-row {
  padding: 0.375rem 0;
  border-bottom: 1px solid var(--border);
  transition: background-color 0.15s ease;
}

.grid-row.habit-row:hover {
  background-color: oklch(from var(--muted) l c h / 0.3);
}

.flex-col-center {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

/* Cells */
.cell-habit-name {
  width: 220px;
  padding: 0 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  overflow: hidden;
}

.habit-name-btn {
  flex: 1;
  text-align: left;
  font-size: 0.875rem;
  font-weight: 500;
  background: transparent;
  color: var(--foreground);
  cursor: pointer;
  border: none;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.habit-name-btn:hover {
  color: var(--primary);
}

.habit-name-input {
  flex: 1;
  font-size: 0.875rem;
  font-family: var(--font-sans);
  background: var(--background);
  color: var(--foreground);
  border: 1px solid var(--ring);
  border-radius: 6px;
  padding: 2px 6px;
  height: 1.75rem;
  width: 100%;
}

.habit-name-input:focus {
  outline: none;
}

/* Habit Actions */
.btn-delete-habit {
  background: transparent;
  opacity: 0;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.2s ease;
  padding: 2px;
  border-radius: 4px;
}

.grid-row.habit-row:hover .btn-delete-habit {
  opacity: 1;
}

.btn-delete-habit svg {
  color: var(--muted-foreground);
  width: 0.875rem;
  height: 0.875rem;
  transition: color 0.15s;
}

.btn-delete-habit:hover svg {
  color: var(--destructive);
}

/* Week Badges */
.week-badge {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  color: white;
  padding: 0.125rem 0.5rem;
  border-radius: 4px;
  letter-spacing: 0.05em;
  margin-bottom: 2px;
}

/* Day cell head */
.day-header-cell {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: var(--cell-size);
  border-radius: 6px;
  padding: 0.25rem 0;
}

.day-header-num {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--foreground);
}

.day-header-day {
  font-size: 9px;
  font-weight: 500;
  color: var(--muted-foreground);
  text-transform: uppercase;
}

/* Habit Toggle Cell */
.cell-day-toggle {
  width: var(--cell-size);
  display: flex;
  justify-content: center;
}

.day-checkbox {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: transparent;
  position: relative;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  align-items: center;
  justify-content: center;
}

.day-checkbox:hover {
  border-color: var(--hover-border-color);
}

.day-checkbox .hover-bg {
  position: absolute;
  inset: 0;
  border-radius: 5px;
  opacity: 0;
  background-color: var(--hover-bg-color);
  transition: opacity 0.2s ease;
  pointer-events: none;
}

.day-checkbox:hover .hover-bg {
  opacity: 1;
}

.day-checkbox.checked {
  background-color: var(--active-color);
  border-color: var(--active-color);
  box-shadow: 0 2px 6px var(--active-shadow-color);
}

.day-checkbox svg {
  width: 1rem;
  height: 1rem;
  color: white;
  stroke-width: 3.5;
  stroke-dasharray: 20;
  stroke-dashoffset: 20;
  pointer-events: none;
  z-index: 1;
}

.day-checkbox.checked svg {
  animation: checkbox-draw 0.25s forwards ease-out;
}

@keyframes checkbox-draw {
  to {
    stroke-dashoffset: 0;
  }
}

.cell-habit-done {
  width: 60px;
  text-align: center;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--foreground);
  font-variant-numeric: tabular-nums;
}

/* Add Habit Button */
.btn-add-habit {
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  border: 1px dashed var(--border);
  border-radius: 8px;
  padding: 0.5rem;
  margin-top: 0.75rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--muted-foreground);
  background: transparent;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-add-habit:hover {
  background-color: oklch(from var(--muted) l c h / 0.4);
  color: var(--foreground);
  border-color: var(--muted-foreground);
}

/* Goals Sidebar Panel */
.goals-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.goal-item {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.goal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
}

.goal-name {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--foreground);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.goal-fraction {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 11px;
  color: var(--muted-foreground);
  font-variant-numeric: tabular-nums;
  flex-shrink: 0;
}

.goal-fraction svg {
  color: var(--week4);
  width: 0.75rem;
  height: 0.75rem;
}

.goal-input {
  width: 2.25rem;
  text-align: right;
  font-size: 11px;
  font-family: var(--font-sans);
  background: var(--muted);
  color: var(--foreground);
  border-radius: 4px;
  border: none;
  padding: 1px 4px;
  font-variant-numeric: tabular-nums;
}

.goal-input:focus {
  outline: none;
  box-shadow: 0 0 0 1px var(--ring);
}

/* Progress bar */
.progress-bar-container {
  height: 0.625rem;
  width: 100%;
  background-color: var(--muted);
  border-radius: 9999px;
  overflow: hidden;
  position: relative;
}

.progress-bar-fill {
  position: absolute;
  inset-y: 0;
  left: 0;
  border-radius: 9999px;
  background-color: var(--primary);
  width: 0%;
  transition: width 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Analytics & Dashboard Overview Rows */
.analytics-grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: 1fr 2fr;
  margin-top: 2rem;
}

@media (max-width: 1024px) {
  .analytics-grid {
    grid-template-columns: 1fr;
  }
}

.month-overview-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  width: 100%;
}

.stat-card {
  padding: 0.75rem;
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.stat-label {
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  color: var(--muted-foreground);
  letter-spacing: 0.05em;
}

/* Circular Chart Widget */
.circular-chart-widget {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.chart-svg-container {
  position: relative;
}

.chart-info {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.chart-percentage {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--foreground);
  line-height: 1.2;
}

.chart-subtext {
  font-size: 10px;
  color: var(--muted-foreground);
}

.chart-label {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--muted-foreground);
}

/* Weekly row grid */
.weeks-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1rem;
}

@media (max-width: 640px) {
  .weeks-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Year Overview Section */
.year-overview-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 1rem;
  margin-top: 1.5rem;
}

@media (max-width: 768px) {
  .year-overview-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 480px) {
  .year-overview-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.month-card-btn {
  background: transparent;
  cursor: pointer;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.month-card-btn:hover {
  transform: translateY(-2px);
}

.year-overview-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.year-overview-stat {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--muted-foreground);
  font-variant-numeric: tabular-nums;
}

/* Watermark Footer */
.watermark {
  position: fixed;
  bottom: 16px;
  right: 16px;
  font-size: 11px;
  font-weight: 500;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  letter-spacing: 0.03em;
  color: var(--muted-foreground);
  opacity: 0.6;
  transition: opacity 0.2s ease, transform 0.2s ease;
  cursor: default;
  user-select: none;
  z-index: 9999;
}

.watermark:hover {
  opacity: 1;
  transform: scale(1.05);
}

/* App Subtitle SEO */
.app-subtitle {
  font-size: 0.95rem;
  color: var(--muted-foreground);
  margin-top: 0.25rem;
  margin-bottom: 1rem;
  max-width: 600px;
  line-height: 1.5;
}

/* SEO Guide & FAQ Section */
.seo-guide-section {
  color: var(--foreground);
}

.seo-guide-content h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--foreground);
}

.seo-intro-text {
  font-size: 0.925rem;
  line-height: 1.6;
  color: var(--muted-foreground);
  margin-bottom: 1.5rem;
}

.seo-features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.seo-feature-item {
  background: var(--muted);
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) - 4px);
  padding: 1rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.seo-feature-item:hover {
  transform: translateY(-2px);
}

.seo-feature-item h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
  color: var(--foreground);
}

.seo-feature-item p {
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--muted-foreground);
}

.seo-faq-container {
  border-top: 1px solid var(--border);
  padding-top: 1.5rem;
  margin-top: 1rem;
}

.seo-faq-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 0.75rem;
}

.seo-faq-item {
  background: var(--muted);
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) - 4px);
  padding: 0.875rem 1rem;
  transition: background 0.2s ease;
}

.seo-faq-item summary {
  cursor: pointer;
  font-size: 0.95rem;
  color: var(--foreground);
  user-select: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.seo-faq-item summary::-webkit-details-marker {
  display: none;
}

.seo-faq-item summary::after {
  content: "+";
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--muted-foreground);
  margin-left: 0.5rem;
  transition: transform 0.2s ease;
}

.seo-faq-item[open] summary::after {
  content: "−";
}

.seo-faq-answer {
  margin-top: 0.75rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border);
}

.seo-faq-answer p {
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--muted-foreground);
}