/* ==========================================================================
   DESIGN TOKENS & SYSTEM THEMES (macOS Sonoma / Apple Human Interface Style)
   ========================================================================== */

:root {
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  /* light theme defaults */
  --bg-app: #f2f3f7;
  --text-primary: #1d1d1f;
  --text-secondary: #6e6e73;
  --text-tertiary: #9e9ea7;
  --text-inverse: #ffffff;

  --panel-bg: rgba(255, 255, 255, 0.65);
  --panel-border: rgba(255, 255, 255, 0.85);
  --panel-border-bottom: rgba(0, 0, 0, 0.08);
  --panel-shadow: 0 20px 50px rgba(0, 0, 0, 0.06), 0 1px 3px rgba(0, 0, 0, 0.03);

  --card-bg: rgba(255, 255, 255, 0.6);
  --card-hover-bg: rgba(255, 255, 255, 0.85);
  --card-border: rgba(0, 0, 0, 0.06);
  --card-border-highlight: rgba(255, 255, 255, 0.9);
  --card-shadow: 0 2px 8px rgba(0, 0, 0, 0.02);

  /* primary accents */
  --accent-rgb: 255, 59, 48;
  --accent-color: #ff3b30;
  --accent-hover: #ff2d20;
  --accent-glow: rgba(255, 59, 48, 0.25);

  /* activity intensity levels */
  --cell-rest-bg: rgba(0, 0, 0, 0.03);
  --cell-rest-border: rgba(0, 0, 0, 0.04);
  --cell-empty-text: rgba(0, 0, 0, 0.18);
  
  --today-ring: #0071e3;
  --today-glow: rgba(0, 113, 227, 0.35);

  /* tooltip */
  --tooltip-bg: rgba(255, 255, 255, 0.85);
  --tooltip-border: rgba(255, 255, 255, 0.95);
  --tooltip-shadow: 0 16px 36px rgba(0, 0, 0, 0.14), 0 2px 6px rgba(0, 0, 0, 0.06);

  /* background orbs */
  --orb-1: rgba(186, 215, 255, 0.55);
  --orb-2: rgba(233, 213, 255, 0.55);
  --orb-3: rgba(255, 215, 215, 0.5);

  --scrollbar-thumb: rgba(0, 0, 0, 0.16);
  --scrollbar-track: rgba(0, 0, 0, 0.02);

  --divider-color: rgba(0, 0, 0, 0.06);
}

/* Explicit or preferred Dark Theme */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg-app: #0c0d10;
    --text-primary: #f5f5f7;
    --text-secondary: #98989f;
    --text-tertiary: #5c5c64;
    --text-inverse: #ffffff;

    --panel-bg: rgba(26, 28, 34, 0.65);
    --panel-border: rgba(255, 255, 255, 0.12);
    --panel-border-bottom: rgba(0, 0, 0, 0.4);
    --panel-shadow: 0 25px 60px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(255, 255, 255, 0.06);

    --card-bg: rgba(36, 38, 46, 0.5);
    --card-hover-bg: rgba(46, 49, 58, 0.65);
    --card-border: rgba(255, 255, 255, 0.07);
    --card-border-highlight: rgba(255, 255, 255, 0.14);
    --card-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);

    --accent-rgb: 255, 69, 58;
    --accent-color: #ff453a;
    --accent-hover: #ff5c52;
    --accent-glow: rgba(255, 69, 58, 0.35);

    --cell-rest-bg: rgba(255, 255, 255, 0.04);
    --cell-rest-border: rgba(255, 255, 255, 0.05);
    --cell-empty-text: rgba(255, 255, 255, 0.14);

    --today-ring: #0a84ff;
    --today-glow: rgba(10, 132, 255, 0.4);

    --tooltip-bg: rgba(30, 32, 40, 0.88);
    --tooltip-border: rgba(255, 255, 255, 0.14);
    --tooltip-shadow: 0 20px 45px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(255, 255, 255, 0.08);

    --orb-1: rgba(30, 41, 79, 0.45);
    --orb-2: rgba(58, 30, 84, 0.45);
    --orb-3: rgba(74, 25, 38, 0.4);

    --scrollbar-thumb: rgba(255, 255, 255, 0.2);
    --scrollbar-track: rgba(255, 255, 255, 0.02);

    --divider-color: rgba(255, 255, 255, 0.08);
  }
}

html[data-theme="dark"] {
  --bg-app: #0c0d10;
  --text-primary: #f5f5f7;
  --text-secondary: #98989f;
  --text-tertiary: #5c5c64;
  --text-inverse: #ffffff;

  --panel-bg: rgba(26, 28, 34, 0.65);
  --panel-border: rgba(255, 255, 255, 0.12);
  --panel-border-bottom: rgba(0, 0, 0, 0.4);
  --panel-shadow: 0 25px 60px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(255, 255, 255, 0.06);

  --card-bg: rgba(36, 38, 46, 0.5);
  --card-hover-bg: rgba(46, 49, 58, 0.65);
  --card-border: rgba(255, 255, 255, 0.07);
  --card-border-highlight: rgba(255, 255, 255, 0.14);
  --card-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);

  --accent-rgb: 255, 69, 58;
  --accent-color: #ff453a;
  --accent-hover: #ff5c52;
  --accent-glow: rgba(255, 69, 58, 0.35);

  --cell-rest-bg: rgba(255, 255, 255, 0.04);
  --cell-rest-border: rgba(255, 255, 255, 0.05);
  --cell-empty-text: rgba(255, 255, 255, 0.14);

  --today-ring: #0a84ff;
  --today-glow: rgba(10, 132, 255, 0.4);

  --tooltip-bg: rgba(30, 32, 40, 0.88);
  --tooltip-border: rgba(255, 255, 255, 0.14);
  --tooltip-shadow: 0 20px 45px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(255, 255, 255, 0.08);

  --orb-1: rgba(30, 41, 79, 0.45);
  --orb-2: rgba(58, 30, 84, 0.45);
  --orb-3: rgba(74, 25, 38, 0.4);

  --scrollbar-thumb: rgba(255, 255, 255, 0.2);
  --scrollbar-track: rgba(255, 255, 255, 0.02);

  --divider-color: rgba(255, 255, 255, 0.08);
}

html[data-theme="light"] {
  --bg-app: #f2f3f7;
  --text-primary: #1d1d1f;
  --text-secondary: #6e6e73;
  --text-tertiary: #9e9ea7;
  --text-inverse: #ffffff;

  --panel-bg: rgba(255, 255, 255, 0.65);
  --panel-border: rgba(255, 255, 255, 0.85);
  --panel-border-bottom: rgba(0, 0, 0, 0.08);
  --panel-shadow: 0 20px 50px rgba(0, 0, 0, 0.06), 0 1px 3px rgba(0, 0, 0, 0.03);

  --card-bg: rgba(255, 255, 255, 0.6);
  --card-hover-bg: rgba(255, 255, 255, 0.85);
  --card-border: rgba(0, 0, 0, 0.06);
  --card-border-highlight: rgba(255, 255, 255, 0.9);
  --card-shadow: 0 2px 8px rgba(0, 0, 0, 0.02);

  --accent-rgb: 255, 59, 48;
  --accent-color: #ff3b30;
  --accent-hover: #ff2d20;
  --accent-glow: rgba(255, 59, 48, 0.25);

  --cell-rest-bg: rgba(0, 0, 0, 0.03);
  --cell-rest-border: rgba(0, 0, 0, 0.04);
  --cell-empty-text: rgba(0, 0, 0, 0.18);

  --today-ring: #0071e3;
  --today-glow: rgba(0, 113, 227, 0.35);

  --tooltip-bg: rgba(255, 255, 255, 0.85);
  --tooltip-border: rgba(255, 255, 255, 0.95);
  --tooltip-shadow: 0 16px 36px rgba(0, 0, 0, 0.14), 0 2px 6px rgba(0, 0, 0, 0.06);

  --orb-1: rgba(186, 215, 255, 0.55);
  --orb-2: rgba(233, 213, 255, 0.55);
  --orb-3: rgba(255, 215, 215, 0.5);

  --scrollbar-thumb: rgba(0, 0, 0, 0.16);
  --scrollbar-track: rgba(0, 0, 0, 0.02);

  --divider-color: rgba(0, 0, 0, 0.06);
}

/* ==========================================================================
   RESET & GLOBAL BASE STYLES
   ========================================================================== */

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-app);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 48px 24px;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  transition: background-color 0.4s ease, color 0.4s ease;
}

/* ==========================================================================
   AMBIENT BACKGROUND LIGHTING (Silky mesh glow)
   ========================================================================== */

.mesh-background {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
  contain: strict;
}

.glow-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.85;
  transition: background 0.8s ease;
  will-change: transform;
}

.glow-1 {
  width: 50vw;
  height: 50vw;
  max-width: 600px;
  max-height: 600px;
  background: var(--orb-1);
  top: -12%;
  left: -8%;
  animation: floatOrb1 26s infinite alternate cubic-bezier(0.45, 0.05, 0.55, 0.95);
}

.glow-2 {
  width: 45vw;
  height: 45vw;
  max-width: 550px;
  max-height: 550px;
  background: var(--orb-2);
  bottom: -10%;
  right: -8%;
  animation: floatOrb2 22s infinite alternate cubic-bezier(0.45, 0.05, 0.55, 0.95);
}

.glow-3 {
  width: 35vw;
  height: 35vw;
  max-width: 450px;
  max-height: 450px;
  background: var(--orb-3);
  top: 35%;
  left: 50%;
  transform: translate(-50%, -50%);
  animation: floatOrb3 30s infinite alternate cubic-bezier(0.45, 0.05, 0.55, 0.95);
}

@keyframes floatOrb1 {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(12%, 8%) scale(1.1); }
}

@keyframes floatOrb2 {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(-10%, -12%) scale(1.08); }
}

@keyframes floatOrb3 {
  0% { transform: translate(-50%, -50%) rotate(0deg) scale(1); }
  100% { transform: translate(-42%, -58%) rotate(180deg) scale(1.15); }
}

/* ==========================================================================
   MAIN APPLICATION CONTAINER & GLASS PANEL
   ========================================================================== */

.app-container {
  width: 100%;
  max-width: 980px;
  margin: 0 auto;
}

.glass-panel {
  background: var(--panel-bg);
  backdrop-filter: blur(30px) saturate(190%);
  -webkit-backdrop-filter: blur(30px) saturate(190%);
  border: 1px solid var(--panel-border);
  border-bottom-color: var(--panel-border-bottom);
  border-radius: 24px;
  box-shadow: var(--panel-shadow);
  overflow: hidden;
  transition: background 0.4s ease, border-color 0.4s ease, box-shadow 0.4s ease;
}

.dashboard-content {
  padding: 32px;
}

/* ==========================================================================
   HEADER SECTION & THEME TOGGLE
   ========================================================================== */

.app-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 28px;
  user-select: none;
}

.header-left {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.header-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.3px;
  color: var(--text-secondary);
  width: fit-content;
  margin-bottom: 4px;
}

.pulse-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--accent-color);
  box-shadow: 0 0 6px var(--accent-glow);
  animation: pulseDot 2s infinite ease-in-out;
}

@keyframes pulseDot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.85); }
}

.app-title {
  font-size: 26px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.6px;
  line-height: 1.2;
}

.app-subtitle {
  font-size: 13px;
  font-weight: 400;
  color: var(--text-secondary);
  letter-spacing: -0.1px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.theme-toggle-btn {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  color: var(--text-primary);
  width: 38px;
  height: 38px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  outline: none;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.theme-toggle-btn:hover {
  background: var(--card-hover-bg);
  border-color: var(--card-border-highlight);
  transform: translateY(-1px);
}

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

.sun-icon { display: none; }
.moon-icon { display: block; }

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .sun-icon { display: block; }
  :root:not([data-theme="light"]) .moon-icon { display: none; }
}

html[data-theme="dark"] .sun-icon { display: block; }
html[data-theme="dark"] .moon-icon { display: none; }

html[data-theme="light"] .sun-icon { display: none; }
html[data-theme="light"] .moon-icon { display: block; }

/* ==========================================================================
   STATISTICS ROW (4 COLUMNS BALANCED)
   ========================================================================== */

.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 28px;
}

.stat-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-top-color: var(--card-border-highlight);
  border-radius: 16px;
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 10px;
  box-shadow: var(--card-shadow);
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), background 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
  position: relative;
  overflow: hidden;
}

.stat-card:hover {
  background: var(--card-hover-bg);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.05);
}

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

.stat-label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--text-secondary);
}

.stat-icon-wrapper {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.04);
}

html[data-theme="dark"] .stat-icon-wrapper,
:root:not([data-theme="light"]) .stat-icon-wrapper {
  background: rgba(255, 255, 255, 0.06);
}

.streak-icon { color: #ff9500; }
.total-icon { color: #0a84ff; }
.intensity-icon { color: #ff3b30; }
.time-icon { color: #30d158; }

.stat-value {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.8px;
  line-height: 1.1;
}

/* ==========================================================================
   CALENDAR SECTION
   ========================================================================== */

.calendar-section {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-top-color: var(--card-border-highlight);
  border-radius: 18px;
  padding: 24px;
  margin-bottom: 24px;
  box-shadow: var(--card-shadow);
  overflow: hidden;
}

.calendar-scroll-wrapper {
  overflow-x: auto;
  padding-bottom: 4px;
}

/* custom scrollbar */
.calendar-scroll-wrapper::-webkit-scrollbar {
  height: 6px;
}

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

.calendar-scroll-wrapper::-webkit-scrollbar-track {
  background: var(--scrollbar-track);
}

/* ==========================================================================
   CALENDAR HEADERS & GRID STRUCTURE
   ========================================================================== */

.calendar-grid-header {
  display: grid;
  grid-template-columns: 48px repeat(7, 1fr);
  padding: 0 0 12px 0;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--divider-color);
  margin-bottom: 16px;
  user-select: none;
}

.grid-header-cell {
  text-align: center;
}

.grid-header-cell.week-num-lbl {
  color: var(--text-tertiary);
  font-weight: 500;
  font-size: 10px;
}

.calendar-grid-body {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

/* ==========================================================================
   MONTH ROW SEPARATOR
   ========================================================================== */

.month-row-separator {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 18px 0 8px 0;
  padding-left: 6px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.6px;
  text-transform: uppercase;
  color: var(--text-primary);
  user-select: none;
}

.month-row-separator:first-child {
  margin-top: 2px;
}

.month-row-separator::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(to right, var(--divider-color), transparent 80%);
}

/* ==========================================================================
   WEEK ROWS & DATE CELLS
   ========================================================================== */

.calendar-week-row {
  display: grid;
  grid-template-columns: 48px repeat(7, 1fr);
  align-items: center;
  gap: 6px;
}

.week-number {
  font-size: 11px;
  font-weight: 500;
  color: var(--text-tertiary);
  text-align: center;
  user-select: none;
  font-variant-numeric: tabular-nums;
}

/* Date cell base styling */
.date-cell {
  aspect-ratio: 1;
  max-width: 44px;
  max-height: 44px;
  width: 100%;
  margin: 0 auto;
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  border-radius: 50%;
  user-select: none;
  transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.2s ease;
}

.date-cell-bg {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  z-index: 1;
  transition: all 0.25s ease;
  pointer-events: none;
}

.day-num {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-primary);
  z-index: 2;
  pointer-events: none;
  transition: color 0.2s ease, font-weight 0.2s ease;
  font-variant-numeric: tabular-nums;
}

/* Hover effects */
.date-cell:not(.empty):hover {
  transform: scale(1.18);
  z-index: 10;
}

/* Rest day styling */
.date-cell.rest-day .date-cell-bg {
  background: var(--cell-rest-bg);
  border: 1px solid var(--cell-rest-border);
}

.date-cell.rest-day:hover .date-cell-bg {
  background: rgba(0, 0, 0, 0.08);
}

html[data-theme="dark"] .date-cell.rest-day:hover .date-cell-bg,
:root:not([data-theme="light"]) .date-cell.rest-day:hover .date-cell-bg {
  background: rgba(255, 255, 255, 0.1);
}

/* Empty / Future day styling */
.date-cell.empty {
  cursor: default;
  pointer-events: none;
}

.date-cell.empty .day-num {
  color: var(--cell-empty-text);
  font-weight: 400;
}

/* Active Workout Day Styling - Crisp Apple rings/activity badge aesthetic */
.date-cell.active-workout .date-cell-bg {
  background: rgba(var(--accent-rgb), var(--intensity-opacity, 0.4));
  border: 1px solid rgba(var(--accent-rgb), calc(var(--intensity-opacity, 0.4) + 0.15));
  box-shadow: 0 2px 8px rgba(var(--accent-rgb), calc(var(--intensity-opacity, 0.4) * 0.4));
}

/* Peak intensity high-contrast styling */
.date-cell.active-workout[data-intensity-tier="peak"] .date-cell-bg {
  background: linear-gradient(135deg, rgba(255, 69, 58, 0.95), rgba(255, 120, 70, 0.95));
  border: 1px solid rgba(255, 255, 255, 0.4);
  box-shadow: 0 4px 14px var(--accent-glow);
}

.date-cell.active-workout[data-intensity-tier="peak"] .day-num {
  color: #ffffff;
  font-weight: 600;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.date-cell.active-workout:hover .date-cell-bg {
  box-shadow: 0 4px 16px var(--accent-glow);
}

/* Today indicator */
.date-cell.is-today::after {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: 50%;
  border: 2px solid var(--today-ring);
  box-shadow: 0 0 8px var(--today-glow);
  pointer-events: none;
  z-index: 3;
}

/* ==========================================================================
   LEGEND & FOOTER
   ========================================================================== */

.calendar-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--divider-color);
  user-select: none;
}

.legend-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.legend-text {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
}

.legend-subtext {
  font-size: 11px;
  color: var(--text-tertiary);
  font-weight: 500;
}

.legend-scale {
  display: flex;
  gap: 6px;
  align-items: center;
}

.legend-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  transition: transform 0.15s ease;
}

.legend-dot:hover {
  transform: scale(1.2);
}

.legend-dot[data-level="0"] {
  background: var(--cell-rest-bg);
  border: 1px solid var(--cell-rest-border);
}

.legend-dot[data-level="1"] {
  background: rgba(var(--accent-rgb), 0.25);
  border: 1px solid rgba(var(--accent-rgb), 0.35);
}

.legend-dot[data-level="2"] {
  background: rgba(var(--accent-rgb), 0.5);
  border: 1px solid rgba(var(--accent-rgb), 0.6);
}

.legend-dot[data-level="3"] {
  background: rgba(var(--accent-rgb), 0.75);
  border: 1px solid rgba(var(--accent-rgb), 0.85);
}

.legend-dot[data-level="4"] {
  background: linear-gradient(135deg, rgba(255, 69, 58, 0.95), rgba(255, 120, 70, 0.95));
  border: 1px solid rgba(255, 255, 255, 0.4);
  box-shadow: 0 1px 4px var(--accent-glow);
}

.legend-today-hint {
  display: flex;
  align-items: center;
  gap: 8px;
}

.today-indicator-sample {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid var(--today-ring);
  box-shadow: 0 0 6px var(--today-glow);
}

/* ==========================================================================
   GLASSMORPHIC TOOLTIP WITH DYNAMIC ARROW
   ========================================================================== */

.sonoma-tooltip {
  position: fixed;
  z-index: 1000;
  background: var(--tooltip-bg);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border: 1px solid var(--tooltip-border);
  border-radius: 14px;
  box-shadow: var(--tooltip-shadow);
  padding: 14px 16px;
  width: 240px;
  pointer-events: none;
  opacity: 0;
  transform: translateY(6px) scale(0.96);
  transition: opacity 0.16s cubic-bezier(0.16, 1, 0.3, 1), transform 0.16s cubic-bezier(0.16, 1, 0.3, 1);
  font-size: 12px;
}

.sonoma-tooltip.visible {
  opacity: 1;
  transform: translateY(0) scale(1);
}

/* Tooltip Arrow */
.tooltip-arrow {
  position: absolute;
  width: 10px;
  height: 10px;
  background: inherit;
  backdrop-filter: inherit;
  -webkit-backdrop-filter: inherit;
  border-right: 1px solid var(--tooltip-border);
  border-bottom: 1px solid var(--tooltip-border);
  bottom: -6px;
  left: calc(50% - 5px);
  transform: rotate(45deg);
  pointer-events: none;
}

.tooltip-header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
  gap: 8px;
}

.tooltip-header {
  font-weight: 600;
  font-size: 13px;
  color: var(--text-primary);
  letter-spacing: -0.2px;
}

.tooltip-badge {
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 10px;
  background: rgba(var(--accent-rgb), 0.15);
  color: var(--accent-color);
  letter-spacing: -0.2px;
}

.tooltip-meta-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}

.tooltip-body-label {
  font-size: 11px;
  color: var(--text-secondary);
  font-weight: 500;
}

.tooltip-meta-val {
  font-weight: 600;
  font-size: 12px;
  color: var(--text-primary);
}

.tooltip-progress-bar {
  width: 100%;
  height: 4px;
  background: rgba(0, 0, 0, 0.06);
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 10px;
}

html[data-theme="dark"] .tooltip-progress-bar,
:root:not([data-theme="light"]) .tooltip-progress-bar {
  background: rgba(255, 255, 255, 0.08);
}

.tooltip-progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #ff9500, var(--accent-color));
  border-radius: 4px;
  transition: width 0.3s ease;
}

.tooltip-divider {
  height: 1px;
  background: var(--divider-color);
  margin: 8px 0;
}

.tooltip-section-title {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--text-tertiary);
  margin-bottom: 6px;
}

.tooltip-exercises {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.tooltip-exercises li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-primary);
  font-size: 11.5px;
}

.exercise-name {
  color: var(--text-secondary);
  font-weight: 500;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 135px;
}

.exercise-val {
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--text-primary);
  background: rgba(0, 0, 0, 0.04);
  padding: 1px 6px;
  border-radius: 6px;
}

html[data-theme="dark"] .exercise-val,
:root:not([data-theme="light"]) .exercise-val {
  background: rgba(255, 255, 255, 0.06);
}

/* ==========================================================================
   RESPONSIVE DESIGN BREAKPOINTS
   ========================================================================== */

@media (max-width: 820px) {
  body {
    padding: 24px 16px;
  }

  .dashboard-content {
    padding: 20px;
  }

  .stats-row {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 540px) {
  body {
    padding: 16px 10px;
  }

  .dashboard-content {
    padding: 16px 12px;
  }

  .app-header {
    flex-direction: column;
    gap: 14px;
  }

  .header-actions {
    align-self: flex-end;
  }

  .stats-row {
    grid-template-columns: 1fr;
  }

  .calendar-section {
    padding: 14px 10px;
  }

  .calendar-grid-header,
  .calendar-week-row {
    grid-template-columns: 36px repeat(7, 1fr);
    gap: 2px;
  }

  .date-cell {
    max-width: 34px;
    max-height: 34px;
  }

  .day-num {
    font-size: 11px;
  }

  .calendar-footer {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }
}