/* Luxury Design System - Mobile First */

:root {
  /* Sophisticated Color Palette */
  --color-primary: #1a1a1a;
  --color-secondary: #f8f7f4;
  --color-accent: #c9a961;
  --color-text-primary: #1a1a1a;
  --color-text-secondary: #666666;
  --color-text-muted: #999999;
  --color-background: #ffffff;
  --color-surface: #fafafa;
  --color-border: #e5e5e5;
  --color-success: #4a5d4a;
  --color-warning: #9b7653;
  --color-error: #8b4545;
  
  /* Typography Scale - Mobile First - Optimized for Japanese */
  --font-family-primary: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic UI", "Meiryo", "Segoe UI", "Helvetica Neue", sans-serif;
  --font-family-mono: "SF Mono", Monaco, "Cascadia Code", monospace;
  
  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-lg: 1.125rem;   /* 18px */
  --font-size-xl: 1.25rem;    /* 20px */
  --font-size-2xl: 1.5rem;    /* 24px */
  --font-size-3xl: 2rem;      /* 32px */
  
  /* Spacing System */
  --space-xs: 0.25rem;   /* 4px */
  --space-sm: 0.5rem;    /* 8px */
  --space-md: 1rem;      /* 16px */
  --space-lg: 1.5rem;    /* 24px */
  --space-xl: 2rem;      /* 32px */
  --space-2xl: 3rem;     /* 48px */
  --space-3xl: 4rem;     /* 64px */
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-xl: 0 8px 32px rgba(0, 0, 0, 0.12);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;
  
  /* Z-index */
  --z-base: 1;
  --z-dropdown: 100;
  --z-modal: 200;
  --z-notification: 300;
}

/* Reset & Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-background);
  min-height: 100vh;
  overflow-x: hidden;
}

/* Mobile-First Container */
.luxury-container {
  width: 100%;
  padding: var(--space-md);
  margin: 0 auto;
}

/* Typography */
.luxury-heading-1 {
  font-size: var(--font-size-2xl);
  font-weight: 300;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: var(--space-lg);
  color: var(--color-text-primary);
}

.luxury-heading-2 {
  font-size: var(--font-size-xl);
  font-weight: 400;
  letter-spacing: -0.01em;
  line-height: 1.3;
  margin-bottom: var(--space-md);
  color: var(--color-text-primary);
}

.luxury-text {
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text-secondary);
}

.luxury-text-small {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* Mobile-First Timer Display */
.luxury-timer {
  text-align: center;
  padding: var(--space-2xl) var(--space-lg);
  background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-background) 100%);
  border-radius: var(--radius-xl);
  margin-bottom: var(--space-xl);
  position: relative;
  overflow: hidden;
}

.luxury-timer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
  animation: shimmer 3s infinite;
}

@keyframes shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

.luxury-timer-display {
  font-size: var(--font-size-3xl);
  font-weight: 200;
  letter-spacing: 0.05em;
  font-variant-numeric: tabular-nums;
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
  font-family: var(--font-family-mono);
}

.luxury-timer-label {
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  font-weight: 500;
}

/* Mobile-First Buttons */
.luxury-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  font-size: var(--font-size-base);
  font-weight: 500;
  letter-spacing: 0.02em;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  width: 100%;
  max-width: 280px;
}

.luxury-btn-primary {
  background-color: var(--color-primary);
  color: var(--color-secondary);
}

.luxury-btn-primary:hover {
  background-color: #2a2a2a;
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.luxury-btn-primary:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

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

.luxury-btn-secondary:hover {
  background-color: var(--color-surface);
  border-color: var(--color-text-secondary);
}

.luxury-btn-accent {
  background: linear-gradient(135deg, var(--color-accent), #b8984f);
  color: white;
}

.luxury-btn-accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(201, 169, 97, 0.3);
}

/* Mobile-First Task Cards */
.luxury-task-card {
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  margin-bottom: var(--space-md);
  transition: all var(--transition-base);
  cursor: pointer;
  position: relative;
}

.luxury-task-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
  transform: translateX(4px);
}

.luxury-task-card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background-color: transparent;
  border-radius: var(--radius-lg) 0 0 var(--radius-lg);
  transition: all var(--transition-base);
}

.luxury-task-card:hover::before {
  background-color: var(--color-accent);
}

.luxury-task-card.completed {
  opacity: 0.6;
  background-color: var(--color-surface);
}

.luxury-task-card.completed .luxury-task-title {
  text-decoration: line-through;
  color: var(--color-text-muted);
}

.luxury-task-title {
  font-size: var(--font-size-base);
  font-weight: 500;
  color: var(--color-text-primary);
  margin-bottom: var(--space-xs);
}

.luxury-task-meta {
  display: flex;
  gap: var(--space-md);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* Mobile-First Input Fields */
.luxury-input-group {
  margin-bottom: var(--space-lg);
}

.luxury-input-label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.luxury-input {
  width: 100%;
  padding: var(--space-md);
  font-size: var(--font-size-base);
  font-family: inherit;
  background-color: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  -webkit-appearance: none;
}

.luxury-input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(201, 169, 97, 0.1);
}

.luxury-input::placeholder {
  color: var(--color-text-muted);
}

/* Mobile Navigation */
.luxury-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid var(--color-border);
  z-index: var(--z-dropdown);
  padding: var(--space-md) 0;
}

.luxury-nav-items {
  display: flex;
  justify-content: space-around;
  align-items: center;
}

.luxury-nav-item {
  flex: 1;
  text-align: center;
  padding: var(--space-sm);
  color: var(--color-text-muted);
  transition: all var(--transition-base);
  cursor: pointer;
}

.luxury-nav-item.active {
  color: var(--color-accent);
}

.luxury-nav-icon {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-xs);
}

.luxury-nav-label {
  font-size: var(--font-size-xs);
  font-weight: 500;
  display: block;
}

/* Floating Action Button */
.luxury-fab {
  position: fixed;
  bottom: 100px;
  right: var(--space-lg);
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--color-accent), #b8984f);
  color: white;
  border: none;
  box-shadow: var(--shadow-xl);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xl);
  transition: all var(--transition-base);
  z-index: var(--z-dropdown);
}

.luxury-fab:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 20px rgba(201, 169, 97, 0.4);
}

.luxury-fab:active {
  transform: scale(0.95);
}

/* Tablet Breakpoint */
@media (min-width: 768px) {
  .luxury-container {
    max-width: 768px;
    padding: var(--space-xl);
  }
  
  .luxury-heading-1 {
    font-size: var(--font-size-3xl);
  }
  
  .luxury-timer-display {
    font-size: 4rem;
  }
  
  .luxury-btn {
    width: auto;
    min-width: 200px;
  }
  
  .luxury-task-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
  }
  
  .luxury-task-card {
    margin-bottom: 0;
  }
}

/* Desktop Breakpoint */
@media (min-width: 1024px) {
  .luxury-container {
    max-width: 1024px;
  }
  
  .luxury-nav {
    position: static;
    border-top: none;
    border-bottom: 1px solid var(--color-border);
    margin-bottom: var(--space-xl);
  }
  
  .luxury-nav-items {
    justify-content: flex-start;
    gap: var(--space-xl);
  }
  
  .luxury-nav-item {
    flex: initial;
  }
  
  .luxury-task-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.luxury-fade-in {
  animation: fadeIn var(--transition-slow) ease-out;
}

/* Loading State */
.luxury-skeleton {
  background: linear-gradient(90deg, var(--color-surface) 25%, var(--color-border) 50%, var(--color-surface) 75%);
  background-size: 200% 100%;
  animation: loading 1.5s infinite;
  border-radius: var(--radius-md);
}

@keyframes loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* Focus Visible */
*:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-surface);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: var(--radius-full);
}

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