/**
 * Strava Booster Design System
 *
 * Shared design tokens for consistent UI across web and console applications.
 * All custom properties defined here should be used throughout the codebase
 * to maintain visual consistency and enable easy theme updates.
 */

:root {
  /* ============================================
     COLOR SYSTEM
     ============================================ */

  /* Primary Brand Colors */
  --strava-orange: #FC4C02;
  --strava-orange-dark: #E34402;
  --strava-orange-light: #FC6B3C;
  --orange: #FC4C02; /* Alias for convenience */

  /* Grayscale System (10-step scale for granular control) */
  --gray-900: #1A1A1A; /* Darkest - primary text */
  --gray-800: #2D2D2D;
  --gray-700: #4A4A4A;
  --gray-600: #6B6B6B; /* Secondary text */
  --gray-500: #8E8E8E;
  --gray-400: #ABABAB;
  --gray-300: #D4D4D4;
  --gray-200: #E5E5E5; /* Borders */
  --gray-100: #F0F0F0;
  --gray-50: #FAFAFA;  /* Lightest - backgrounds */

  /* Semantic Colors */
  --ink: var(--gray-900);          /* Primary text color */
  --muted-ink: var(--gray-600);    /* Secondary text color */
  --bg: var(--gray-50);            /* Page background */
  --card: #FFFFFF;                 /* Card backgrounds */
  --card-bg: #FFFFFF;              /* Alias for --card */
  --border: var(--gray-200);       /* Standard border color */
  --hover-bg: var(--gray-100);     /* Hover state background */

  /* Alias tokens for backward compatibility */
  --color-background: var(--bg);
  --color-border: var(--border);
  --color-danger: #dc2626;
  --accent: var(--strava-orange);
  --border-radius: 8px;

  /* Status Colors */
  --success: #1BC96D;
  --success-light: #E8F7EF;
  --success-dark: #16a34a;
  --warning: #FFB74D;
  --warning-light: #FFF4E5;
  --warning-dark: #D97706;
  --error: #FC5200;
  --error-light: #FFEBE5;
  --error-dark: #dc2626;

  /* Text Colors */
  --text-inverse: #FFFFFF;        /* White text on colored backgrounds */
  --link-color: #2d6cdf;          /* Blue link color */
  --link-color-hover: #1d4ed8;    /* Link hover state */

  /* Alert Colors (Bootstrap-style) */
  --alert-warning-bg: #FFF3CD;
  --alert-warning-border: #FFE69C;
  --alert-warning-text: #856404;
  --alert-danger-bg: #fef2f2;
  --alert-danger-border: #fecaca;
  --alert-danger-text: #991b1b;
  --alert-success-bg: #f0fdf4;
  --alert-success-border: #86efac;
  --alert-success-text: #166534;
  --alert-info-bg: #eff6ff;
  --alert-info-border: #93c5fd;
  --alert-info-text: #1e40af;

  /* ============================================
     OPACITY COLOR VARIANTS
     ============================================ */

  /* Strava Orange with opacity (for backgrounds, hovers, focus states) */
  --orange-alpha-02: rgba(252, 76, 2, 0.02);
  --orange-alpha-03: rgba(252, 76, 2, 0.03);
  --orange-alpha-05: rgba(252, 76, 2, 0.05);
  --orange-alpha-08: rgba(252, 76, 2, 0.08);
  --orange-alpha-10: rgba(252, 76, 2, 0.1);
  --orange-alpha-15: rgba(252, 76, 2, 0.15);
  --orange-alpha-20: rgba(252, 76, 2, 0.2);
  --orange-alpha-25: rgba(252, 76, 2, 0.25);
  --orange-alpha-30: rgba(252, 76, 2, 0.3);
  --orange-alpha-35: rgba(252, 76, 2, 0.35);
  --orange-alpha-50: rgba(252, 76, 2, 0.5);
  --orange-alpha-70: rgba(252, 76, 2, 0.7);
  --orange-alpha-80: rgba(252, 76, 2, 0.8);

  /* Success/Green with opacity */
  --success-alpha-03: rgba(27, 201, 109, 0.03);
  --success-alpha-05: rgba(27, 201, 109, 0.05);
  --success-alpha-08: rgba(27, 201, 109, 0.08);
  --success-alpha-10: rgba(27, 201, 109, 0.1);
  --success-alpha-15: rgba(27, 201, 109, 0.15);
  --success-alpha-20: rgba(27, 201, 109, 0.2);
  --success-alpha-30: rgba(27, 201, 109, 0.3);
  --success-alpha-40: rgba(27, 201, 109, 0.4);
  --success-alpha-50: rgba(27, 201, 109, 0.5);
  --success-alpha-70: rgba(27, 201, 109, 0.7);

  /* Danger/Error/Red with opacity */
  --danger-alpha-03: rgba(220, 38, 38, 0.03);
  --danger-alpha-05: rgba(220, 38, 38, 0.05);
  --danger-alpha-08: rgba(220, 38, 38, 0.08);
  --danger-alpha-10: rgba(220, 38, 38, 0.1);
  --danger-alpha-15: rgba(220, 38, 38, 0.15);
  --danger-alpha-20: rgba(220, 38, 38, 0.2);
  --danger-alpha-30: rgba(220, 38, 38, 0.3);
  --danger-alpha-50: rgba(220, 38, 38, 0.5);

  /* Warning/Amber with opacity */
  --warning-alpha-03: rgba(217, 119, 6, 0.03);
  --warning-alpha-05: rgba(217, 119, 6, 0.05);
  --warning-alpha-10: rgba(217, 119, 6, 0.1);
  --warning-alpha-15: rgba(217, 119, 6, 0.15);
  --warning-alpha-20: rgba(217, 119, 6, 0.2);
  --warning-alpha-30: rgba(217, 119, 6, 0.3);

  /* Info/Blue with opacity */
  --info-alpha-05: rgba(45, 108, 223, 0.05);
  --info-alpha-10: rgba(45, 108, 223, 0.1);
  --info-alpha-15: rgba(45, 108, 223, 0.15);
  --info-alpha-20: rgba(45, 108, 223, 0.2);

  /* Black with opacity (shadows, overlays, borders) */
  --black-alpha-02: rgba(0, 0, 0, 0.02);
  --black-alpha-03: rgba(0, 0, 0, 0.03);
  --black-alpha-04: rgba(0, 0, 0, 0.04);
  --black-alpha-05: rgba(0, 0, 0, 0.05);
  --black-alpha-06: rgba(0, 0, 0, 0.06);
  --black-alpha-08: rgba(0, 0, 0, 0.08);
  --black-alpha-10: rgba(0, 0, 0, 0.1);
  --black-alpha-12: rgba(0, 0, 0, 0.12);
  --black-alpha-15: rgba(0, 0, 0, 0.15);
  --black-alpha-20: rgba(0, 0, 0, 0.2);
  --black-alpha-25: rgba(0, 0, 0, 0.25);
  --black-alpha-30: rgba(0, 0, 0, 0.3);
  --black-alpha-40: rgba(0, 0, 0, 0.4);
  --black-alpha-50: rgba(0, 0, 0, 0.5);
  --black-alpha-60: rgba(0, 0, 0, 0.6);
  --black-alpha-70: rgba(0, 0, 0, 0.7);
  --black-alpha-80: rgba(0, 0, 0, 0.8);
  --black-alpha-90: rgba(0, 0, 0, 0.9);

  /* White with opacity (overlays, text on dark backgrounds) */
  --white-alpha-05: rgba(255, 255, 255, 0.05);
  --white-alpha-10: rgba(255, 255, 255, 0.1);
  --white-alpha-15: rgba(255, 255, 255, 0.15);
  --white-alpha-20: rgba(255, 255, 255, 0.2);
  --white-alpha-25: rgba(255, 255, 255, 0.25);
  --white-alpha-30: rgba(255, 255, 255, 0.3);
  --white-alpha-35: rgba(255, 255, 255, 0.35);
  --white-alpha-40: rgba(255, 255, 255, 0.4);
  --white-alpha-50: rgba(255, 255, 255, 0.5);
  --white-alpha-60: rgba(255, 255, 255, 0.6);
  --white-alpha-70: rgba(255, 255, 255, 0.7);
  --white-alpha-80: rgba(255, 255, 255, 0.8);
  --white-alpha-90: rgba(255, 255, 255, 0.9);

  /* Gradient backgrounds */
  --gradient-success: linear-gradient(135deg, #1BC96D 0%, #4ECDC4 100%);
  --gradient-orange: linear-gradient(135deg, #FC4C02 0%, #FF6B35 100%);
  --gradient-orange-warm: linear-gradient(135deg, #FC5200 0%, #FF6B6B 100%);
  --gradient-blue: linear-gradient(135deg, #4A90E2 0%, #7B68EE 100%);
  --gradient-purple: linear-gradient(135deg, #9B59B6 0%, #C39BD3 100%);
  --gradient-google: linear-gradient(135deg, #1a73e8 0%, #4285f4 100%);
  --gradient-danger: linear-gradient(135deg, #dc2626 0%, #ef4444 100%);
  --gradient-success-light: linear-gradient(135deg, #f0fdf4 0%, #dcfce7 100%);
  --gradient-info-light: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
  --gradient-gray: linear-gradient(135deg, #fafafa 0%, #f5f5f5 100%);
  --gradient-danger-light: linear-gradient(135deg, var(--alert-danger-bg) 0%, #fee2e2 100%);
  --gradient-success-alert: linear-gradient(135deg, var(--alert-success-bg) 0%, #dcfce7 100%);
  --gradient-orange-button: linear-gradient(135deg, var(--strava-orange) 0%, #ea580c 100%);

  /* Alpha gradient backgrounds for badges/overlays */
  --gradient-orange-alpha-10: linear-gradient(135deg, rgba(252, 76, 2, 0.1) 0%, rgba(255, 107, 53, 0.1) 100%);
  --gradient-success-alpha-10: linear-gradient(135deg, rgba(27, 201, 109, 0.1) 0%, rgba(78, 205, 196, 0.1) 100%);
  --gradient-blue-alpha-10: linear-gradient(135deg, rgba(74, 144, 226, 0.1) 0%, rgba(123, 104, 238, 0.1) 100%);
  --gradient-danger-alpha-10: linear-gradient(135deg, rgba(252, 82, 0, 0.1) 0%, rgba(255, 107, 107, 0.1) 100%);

  /* Notification colors */
  --notification-unread-bg: #FFF7ED;
  --notification-unread-hover: #FFEDD5;
  --notification-icon-bg: #FDBA74;
  --notification-icon-text: #9A3412;

  /* Border colors for specific components */
  --border-success-light: #86efac;
  --border-info-light: #93c5fd;

  /* Danger/Red alpha variants */
  --red-alpha-20: rgba(239, 68, 68, 0.2);
  --red-alpha-25: rgba(239, 68, 68, 0.25);
  --red-alpha-30: rgba(239, 68, 68, 0.3);
  --red-alpha-40: rgba(239, 68, 68, 0.4);
  --red-alpha-60: rgba(239, 68, 68, 0.6);

  /* Orange alpha additions */
  --orange-alpha-40: rgba(252, 76, 2, 0.4);

  /* Dark mode status colors - named values for semantic use */
  --dark-success-text: #4ade80;
  --dark-success-text-alt: #10b981;
  --dark-warning-text: #fbbf24;
  --dark-error-text: #fb923c;
  --dark-info-text: #60a5fa;
  --dark-error-text-light: #fca5a5;
  --dark-error-text-lighter: #fecaca;

  /* Neutral gray colors for dark mode text */
  --dark-text-primary: #E5E5E5;
  --dark-text-secondary: #A0A0A0;
  --dark-text-tertiary: #808080;

  /* Color-danger (red) for dark mode */
  --color-danger-dark: #dc2626;

  /* Warning alpha variants */
  --warning-alpha-orange-15: rgba(255, 183, 77, 0.15);
  --warning-alpha-orange-20: rgba(255, 183, 77, 0.2);
  --warning-alpha-orange-30: rgba(255, 183, 77, 0.3);

  /* Blue alpha variants (info/blue button style) */
  --blue-alpha-10: rgba(59, 130, 246, 0.1);
  --blue-alpha-30: rgba(59, 130, 246, 0.3);

  /* ============================================
     COMPONENT TOKENS
     ============================================ */

  /* Input fields */
  --input-bg: var(--card);
  --input-border: var(--border);
  --input-border-focus: var(--strava-orange);
  --input-text: var(--ink);
  --input-placeholder: var(--muted-ink);

  /* Buttons */
  --btn-primary-bg: var(--strava-orange);
  --btn-primary-text: #FFFFFF;
  --btn-primary-hover: var(--strava-orange-dark);
  --btn-secondary-bg: var(--card);
  --btn-secondary-text: var(--ink);
  --btn-secondary-border: var(--border);

  /* Tables */
  --table-header-bg: var(--gray-50);
  --table-row-hover: var(--hover-bg);
  --table-border: var(--border);

  /* ============================================
     SHADOW SYSTEM (Elevation Levels)
     ============================================ */

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.06);   /* Subtle elevation */
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.08);   /* Standard elevation */
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.10);  /* Prominent elevation */
  --shadow-xl: 0 16px 32px rgba(0, 0, 0, 0.12); /* Maximum elevation */

  /* Focus Ring */
  --focus-ring: 0 0 0 3px rgba(252, 76, 2, 0.15);

  /* ============================================
     TYPOGRAPHY
     ============================================ */

  /* Font Stack - System fonts for best performance */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue",
                 Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";

  /* Font Sizes (using clamp for responsive typography) */
  --font-size-base: 16px;
  --font-size-sm: 14px;
  --font-size-xs: 12px;

  --font-size-h1: clamp(32px, 4vw, 48px);
  --font-size-h2: clamp(24px, 3vw, 36px);
  --font-size-h3: clamp(18px, 2vw, 24px);
  --font-size-h4: 18px;
  --font-size-h5: 16px;
  --font-size-h6: 14px;

  /* Font Weights */
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;

  /* Line Heights */
  --line-height-tight: 1.2;  /* For headings */
  --line-height-base: 1.6;   /* For body text */
  --line-height-loose: 1.8;  /* For long-form content */

  /* Letter Spacing (tighter for modern look) */
  --letter-spacing-tight: -0.02em;  /* For headings */
  --letter-spacing-base: -0.01em;   /* For body text */
  --letter-spacing-normal: 0;

  /* ============================================
     SPACING SYSTEM
     ============================================ */

  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 64px;

  /* ============================================
     BORDER SYSTEM
     ============================================ */

  /* Border Widths */
  --border-width-thin: 1px;
  --border-width-medium: 2px;  /* For inputs/buttons - more substantial */
  --border-width-thick: 3px;

  /* Border Radius (modern, subtle rounding) */
  --radius-sm: 4px;
  --radius-md: 6px;   /* Standard for buttons/inputs */
  --radius-lg: 8px;   /* For cards */
  --radius-xl: 16px;  /* For large cards */
  --radius-full: 999px; /* For pills/badges */

  /* ============================================
     TRANSITIONS & ANIMATIONS
     ============================================ */

  /* Timing Functions */
  --transition-duration-fast: 100ms;    /* Snappy interactions */
  --transition-duration-base: 200ms;    /* Standard transitions */
  --transition-duration-slow: 300ms;    /* Deliberate transitions */

  /* Easing Functions */
  --ease-standard: ease;
  --ease-smooth: cubic-bezier(.19, 1, .22, 1); /* Sophisticated bounce-back */
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --ease-in: cubic-bezier(0.4, 0, 1, 1);

  /* ============================================
     Z-INDEX SCALE
     ============================================ */

  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;

  /* ============================================
     BREAKPOINTS (for media queries)
     ============================================ */

  --breakpoint-sm: 640px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
  --breakpoint-xl: 1280px;
}

/**
 * Dark Mode Support
 * Uses softer dark colors for a comfortable reading experience.
 * Triggered by data-theme="dark" attribute on html/body element.
 */
[data-theme="dark"] {
  /* Soft Dark Grayscale (GitHub-inspired, comfortable on eyes) */
  --gray-900: #E6EDF3; /* Lightest - primary text */
  --gray-800: #D0D7DE;
  --gray-700: #9CA3AF;
  --gray-600: #9CA3AF; /* Secondary text - improved contrast */
  --gray-500: #6E7681;
  --gray-400: #484F58;
  --gray-300: #373E47;
  --gray-200: #30363D; /* Borders */
  --gray-100: #24292F;
  --gray-50: #1C2128;  /* Darkest - backgrounds */

  /* Semantic Colors (dark mode) */
  --ink: #E6EDF3;              /* Primary text color */
  --muted-ink: #9CA3AF;        /* Secondary text color - improved contrast */
  --bg: #1C2128;               /* Page background */
  --card: #24292F;             /* Card backgrounds */
  --card-bg: #24292F;          /* Alias for --card */
  --border: #30363D;           /* Standard border color */
  --hover-bg: #2D333B;         /* Hover state background */

  /* Alias tokens (dark mode) */
  --color-background: var(--bg);
  --color-border: var(--border);
  --color-danger: #F85149;

  /* Component tokens (dark mode) */
  --input-bg: var(--card);
  --input-border: var(--border);
  --table-header-bg: var(--gray-100);
  --table-row-hover: var(--hover-bg);

  /* Status Colors (adjusted for dark backgrounds) */
  --success: #3FB950;
  --success-light: rgba(63, 185, 80, 0.15);
  --success-dark: #22c55e;
  --warning: #D29922;
  --warning-light: rgba(210, 153, 34, 0.15);
  --warning-dark: #fbbf24;
  --error: #F85149;
  --error-light: rgba(248, 81, 73, 0.15);
  --error-dark: #ef4444;

  /* Text Colors (dark mode) */
  --link-color: #58a6ff;
  --link-color-hover: #79b8ff;

  /* Alert Colors (dark mode) */
  --alert-warning-bg: rgba(210, 153, 34, 0.15);
  --alert-warning-border: rgba(210, 153, 34, 0.4);
  --alert-warning-text: #fbbf24;
  --alert-danger-bg: rgba(248, 81, 73, 0.15);
  --alert-danger-border: rgba(248, 81, 73, 0.4);
  --alert-danger-text: #fca5a5;
  --alert-success-bg: rgba(63, 185, 80, 0.15);
  --alert-success-border: rgba(63, 185, 80, 0.4);
  --alert-success-text: #4ade80;
  --alert-info-bg: rgba(88, 166, 255, 0.15);
  --alert-info-border: rgba(88, 166, 255, 0.4);
  --alert-info-text: #58a6ff;

  /* Shadows (subtle for dark mode) */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 16px 32px rgba(0, 0, 0, 0.6);

  /* Focus Ring (adjusted for dark) */
  --focus-ring: 0 0 0 3px rgba(252, 76, 2, 0.25);

  /* Opacity variants (adjusted for dark backgrounds) */
  --orange-alpha-05: rgba(252, 76, 2, 0.08);
  --orange-alpha-08: rgba(252, 76, 2, 0.12);
  --orange-alpha-10: rgba(252, 76, 2, 0.15);
  --orange-alpha-15: rgba(252, 76, 2, 0.2);
  --orange-alpha-20: rgba(252, 76, 2, 0.25);

  --success-alpha-05: rgba(63, 185, 80, 0.08);
  --success-alpha-10: rgba(63, 185, 80, 0.15);
  --success-alpha-15: rgba(63, 185, 80, 0.2);

  --danger-alpha-05: rgba(248, 81, 73, 0.08);
  --danger-alpha-10: rgba(248, 81, 73, 0.15);
  --danger-alpha-15: rgba(248, 81, 73, 0.2);
  --danger-alpha-30: rgba(248, 81, 73, 0.3);

  --warning-alpha-05: rgba(210, 153, 34, 0.08);
  --warning-alpha-10: rgba(210, 153, 34, 0.15);
  --warning-alpha-15: rgba(210, 153, 34, 0.2);

  --info-alpha-05: rgba(88, 166, 255, 0.08);
  --info-alpha-10: rgba(88, 166, 255, 0.15);
  --info-alpha-15: rgba(88, 166, 255, 0.2);

  --black-alpha-05: rgba(0, 0, 0, 0.15);
  --black-alpha-10: rgba(0, 0, 0, 0.25);
  --black-alpha-20: rgba(0, 0, 0, 0.35);

  --white-alpha-05: rgba(255, 255, 255, 0.05);
  --white-alpha-10: rgba(255, 255, 255, 0.1);
  --white-alpha-20: rgba(255, 255, 255, 0.2);
}

/**
 * Reduced Motion Support (Accessibility)
 */
@media (prefers-reduced-motion: reduce) {
  :root {
    --transition-duration-fast: 0ms;
    --transition-duration-base: 0ms;
    --transition-duration-slow: 0ms;
  }

  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ============================================
   LOADING SPINNER COMPONENT
   ============================================ */

/**
 * Orange Strava-themed loading spinner
 * Usage: <div class="spinner"></div>
 * Sizes: .spinner--sm (14px), default (20px), .spinner--lg (32px)
 */

@keyframes spinner-rotate {
  to { transform: rotate(360deg); }
}

.spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--border, #E5E5E5);
  border-top-color: var(--strava-orange, #FC4C02);
  border-radius: 50%;
  animation: spinner-rotate 0.8s linear infinite;
  flex-shrink: 0;
}

.spinner--sm {
  width: 14px;
  height: 14px;
  border-width: 2px;
}

.spinner--lg {
  width: 32px;
  height: 32px;
  border-width: 3px;
}

/* Centered spinner with optional text */
.spinner-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm, 8px);
  padding: var(--spacing-lg, 24px);
}

.spinner-container .spinner-text {
  font-size: var(--font-size-sm, 14px);
  color: var(--muted-ink, #6B6B6B);
}

/* ============================================
   STEPPER COMPONENT
   ============================================ */

/**
 * Strava Booster Stepper Input
 * Usage:
 * <div class="sb-stepper">
 *   <button type="button" class="sb-stepper-btn sb-stepper-decrement" aria-label="Decrease">−</button>
 *   <input type="number" class="sb-stepper-input" value="1.00" step="0.01" min="0.01" max="99.99">
 *   <button type="button" class="sb-stepper-btn sb-stepper-increment" aria-label="Increase">+</button>
 * </div>
 *
 * Sizes: .sb-stepper--sm (compact), default (standard), .sb-stepper--lg (large)
 */

.sb-stepper {
  display: inline-flex;
  align-items: stretch;
  border: 2px solid var(--border, #E5E5E5);
  border-radius: var(--radius-md, 6px);
  overflow: hidden;
  background: var(--card, #FFFFFF);
  transition: border-color var(--transition-duration-base, 200ms) var(--ease-standard, ease),
              box-shadow var(--transition-duration-base, 200ms) var(--ease-standard, ease);
}

.sb-stepper:hover {
  border-color: var(--gray-300, #D4D4D4);
}

.sb-stepper:focus-within {
  border-color: var(--strava-orange, #FC4C02);
  box-shadow: var(--focus-ring, 0 0 0 3px rgba(252, 76, 2, 0.15));
}

.sb-stepper-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  padding: 0;
  border: none;
  background: var(--gray-50, #FAFAFA);
  color: var(--gray-600, #6B6B6B);
  font-size: 20px;
  font-weight: var(--font-weight-medium, 500);
  cursor: pointer;
  user-select: none;
  transition: background-color var(--transition-duration-fast, 100ms) var(--ease-standard, ease),
              color var(--transition-duration-fast, 100ms) var(--ease-standard, ease);
}

.sb-stepper-btn:hover {
  background: var(--strava-orange, #FC4C02);
  color: white;
}

.sb-stepper-btn:active {
  background: var(--strava-orange-dark, #E34402);
  color: white;
}

.sb-stepper-btn:disabled {
  background: var(--gray-100, #F0F0F0);
  color: var(--gray-400, #ABABAB);
  cursor: not-allowed;
}

.sb-stepper-decrement {
  border-right: 1px solid var(--border, #E5E5E5);
}

.sb-stepper-increment {
  border-left: 1px solid var(--border, #E5E5E5);
}

.sb-stepper-input {
  width: 80px;
  padding: 10px 12px;
  border: none;
  background: var(--card, #FFFFFF);
  color: var(--ink, #1A1A1A);
  font-size: var(--font-size-base, 16px);
  font-weight: var(--font-weight-semibold, 600);
  text-align: center;
  -moz-appearance: textfield;
  appearance: textfield;
}

.sb-stepper-input::-webkit-outer-spin-button,
.sb-stepper-input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.sb-stepper-input:focus {
  outline: none;
}

/* Size variants */
.sb-stepper--sm .sb-stepper-btn {
  width: 36px;
  font-size: 16px;
}

.sb-stepper--sm .sb-stepper-input {
  width: 60px;
  padding: 6px 8px;
  font-size: var(--font-size-sm, 14px);
}

.sb-stepper--lg .sb-stepper-btn {
  width: 52px;
  font-size: 24px;
}

.sb-stepper--lg .sb-stepper-input {
  width: 100px;
  padding: 14px 16px;
  font-size: 18px;
}

/* With prefix/suffix labels */
.sb-stepper-wrapper {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm, 8px);
}

.sb-stepper-prefix,
.sb-stepper-suffix {
  font-size: var(--font-size-sm, 14px);
  color: var(--muted-ink, #6B6B6B);
  font-weight: var(--font-weight-medium, 500);
}

.sb-stepper-prefix {
  padding-right: var(--spacing-xs, 4px);
}

/* ============================================
   MODAL / DIALOG COMPONENT
   ============================================ */

/**
 * Custom modal dialogs to replace native confirm/alert
 * Usage: sb.confirm('Are you sure?', { onConfirm: () => {} })
 */

.sb-modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 9998;
  opacity: 0;
  transition: opacity var(--transition-duration-base, 200ms) var(--ease-standard, ease);
  backdrop-filter: blur(2px);
}

.sb-modal-backdrop.active {
  opacity: 1;
}

.sb-modal {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.95);
  background: var(--card, #fff);
  border-radius: var(--radius-lg, 8px);
  box-shadow: var(--shadow-xl, 0 16px 32px rgba(0, 0, 0, 0.12));
  z-index: 9999;
  max-width: 400px;
  width: calc(100% - 32px);
  opacity: 0;
  transition: opacity var(--transition-duration-base, 200ms) var(--ease-standard, ease),
              transform var(--transition-duration-base, 200ms) var(--ease-smooth, cubic-bezier(.19, 1, .22, 1));
}

.sb-modal.active {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

.sb-modal__header {
  padding: var(--spacing-lg, 24px) var(--spacing-lg, 24px) 0;
}

.sb-modal__title {
  font-size: var(--font-size-h4, 18px);
  font-weight: var(--font-weight-semibold, 600);
  color: var(--ink, #1A1A1A);
  margin: 0;
}

.sb-modal__body {
  padding: var(--spacing-md, 16px) var(--spacing-lg, 24px);
  color: var(--muted-ink, #6B6B6B);
  font-size: var(--font-size-base, 16px);
  line-height: var(--line-height-base, 1.6);
}

.sb-modal__footer {
  padding: 0 var(--spacing-lg, 24px) var(--spacing-lg, 24px);
  display: flex;
  justify-content: flex-end;
  gap: var(--spacing-sm, 8px);
}

.sb-modal__btn {
  padding: var(--spacing-sm, 8px) var(--spacing-md, 16px);
  border-radius: var(--radius-md, 6px);
  font-size: var(--font-size-sm, 14px);
  font-weight: var(--font-weight-medium, 500);
  cursor: pointer;
  transition: all var(--transition-duration-fast, 100ms) var(--ease-standard, ease);
  border: none;
}

.sb-modal__btn--cancel {
  background: var(--gray-100, #F0F0F0);
  color: var(--gray-700, #4A4A4A);
}

.sb-modal__btn--cancel:hover {
  background: var(--gray-200, #E5E5E5);
}

.sb-modal__btn--confirm {
  background: var(--strava-orange, #FC4C02);
  color: #fff;
}

.sb-modal__btn--confirm:hover {
  background: var(--strava-orange-dark, #E34402);
}

.sb-modal__btn--danger {
  background: var(--error, #FC5200);
  color: #fff;
}

.sb-modal__btn--danger:hover {
  background: var(--error-dark);
}

/* ============================================
   TOAST NOTIFICATION COMPONENT
   ============================================ */

/**
 * Toast notifications for non-blocking alerts
 * Usage: sb.toast('Message here', 'success')
 * Types: success, error, warning, info
 */

.sb-toast-container {
  position: fixed;
  top: var(--spacing-lg, 24px);
  right: var(--spacing-lg, 24px);
  z-index: var(--z-tooltip, 1070);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm, 8px);
  pointer-events: none;
}

@media (max-width: 480px) {
  .sb-toast-container {
    top: var(--spacing-md, 16px);
    right: var(--spacing-md, 16px);
    left: var(--spacing-md, 16px);
  }
}

.sb-toast {
  background: var(--card, #fff);
  border-radius: var(--radius-md, 6px);
  box-shadow: var(--shadow-lg, 0 8px 16px rgba(0, 0, 0, 0.10));
  padding: var(--spacing-md, 16px);
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm, 8px);
  max-width: 360px;
  pointer-events: auto;
  opacity: 0;
  transform: translateX(100%);
  transition: opacity var(--transition-duration-base, 200ms) var(--ease-standard, ease),
              transform var(--transition-duration-slow, 300ms) var(--ease-smooth, cubic-bezier(.19, 1, .22, 1));
  border-left: 3px solid var(--gray-400, #ABABAB);
}

@media (max-width: 480px) {
  .sb-toast {
    max-width: 100%;
    transform: translateY(-20px);
  }
}

.sb-toast.active {
  opacity: 1;
  transform: translateX(0);
}

@media (max-width: 480px) {
  .sb-toast.active {
    transform: translateY(0);
  }
}

.sb-toast--success {
  border-left-color: var(--success, #1BC96D);
}

.sb-toast--error {
  border-left-color: var(--error, #FC5200);
}

.sb-toast--warning {
  border-left-color: var(--warning, #FFB74D);
}

.sb-toast--info {
  border-left-color: var(--strava-orange, #FC4C02);
}

.sb-toast__icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
}

.sb-toast--success .sb-toast__icon {
  color: var(--success, #1BC96D);
}

.sb-toast--error .sb-toast__icon {
  color: var(--error, #FC5200);
}

.sb-toast--warning .sb-toast__icon {
  color: var(--warning, #FFB74D);
}

.sb-toast--info .sb-toast__icon {
  color: var(--strava-orange, #FC4C02);
}

.sb-toast__content {
  flex: 1;
  min-width: 0;
}

.sb-toast__title {
  font-weight: var(--font-weight-semibold, 600);
  color: var(--ink, #1A1A1A);
  font-size: var(--font-size-sm, 14px);
  margin-bottom: 2px;
}

.sb-toast__message {
  color: var(--muted-ink, #6B6B6B);
  font-size: var(--font-size-sm, 14px);
  line-height: 1.4;
}

.sb-toast__close {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  background: none;
  border: none;
  color: var(--gray-400, #ABABAB);
  cursor: pointer;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--transition-duration-fast, 100ms);
}

.sb-toast__close:hover {
  color: var(--gray-600, #6B6B6B);
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

/* Display utilities */
.d-none { display: none !important; }
.d-block { display: block !important; }
.d-inline-block { display: inline-block !important; }
.d-flex { display: flex !important; }
.d-inline-flex { display: inline-flex !important; }

/* Flex utilities */
.flex-1 { flex: 1 !important; }
.flex-column { flex-direction: column !important; }
.flex-wrap { flex-wrap: wrap !important; }
.justify-between { justify-content: space-between !important; }
.justify-center { justify-content: center !important; }
.align-center { align-items: center !important; }
.align-start { align-items: flex-start !important; }
.gap-1 { gap: 4px !important; }
.gap-2 { gap: 8px !important; }
.gap-3 { gap: 12px !important; }
.gap-4 { gap: 16px !important; }

/* Text alignment */
.text-left { text-align: left !important; }
.text-center { text-align: center !important; }
.text-right { text-align: right !important; }

/* Text styles */
.text-muted { color: var(--muted-ink) !important; }
.text-danger { color: var(--color-danger, #dc2626) !important; }
.text-success { color: var(--success) !important; }
.text-warning { color: var(--warning) !important; }
.font-mono { font-family: monospace !important; }
.font-semibold { font-weight: var(--font-weight-semibold) !important; }
.font-bold { font-weight: var(--font-weight-bold) !important; }
.text-sm { font-size: var(--font-size-sm) !important; }
.text-xs { font-size: var(--font-size-xs) !important; }

/* Margin utilities */
.m-0 { margin: 0 !important; }
.mt-0 { margin-top: 0 !important; }
.mt-1 { margin-top: 4px !important; }
.mt-2 { margin-top: 8px !important; }
.mt-3 { margin-top: 12px !important; }
.mt-4 { margin-top: 16px !important; }
.mt-5 { margin-top: 24px !important; }
.mt-6 { margin-top: 32px !important; }
.mt-7 { margin-top: 40px !important; }
.mt-8 { margin-top: 48px !important; }
.mb-0 { margin-bottom: 0 !important; }
.mb-1 { margin-bottom: 4px !important; }
.mb-2 { margin-bottom: 8px !important; }
.mb-3 { margin-bottom: 12px !important; }
.mb-4 { margin-bottom: 16px !important; }
.mb-5 { margin-bottom: 24px !important; }
.mb-6 { margin-bottom: 32px !important; }
.ml-2 { margin-left: 8px !important; }
.ml-3 { margin-left: 12px !important; }
.mr-2 { margin-right: 8px !important; }
.mr-3 { margin-right: 12px !important; }
.mx-auto { margin-left: auto !important; margin-right: auto !important; }

/* Padding utilities */
.p-0 { padding: 0 !important; }
.p-2 { padding: 8px !important; }
.p-3 { padding: 12px !important; }
.p-4 { padding: 16px !important; }
.py-2 { padding-top: 8px !important; padding-bottom: 8px !important; }
.px-3 { padding-left: 12px !important; padding-right: 12px !important; }
.pl-4 { padding-left: 16px !important; }
.pl-5 { padding-left: 20px !important; }

/* Width utilities */
.w-100 { width: 100% !important; }
.max-w-sm { max-width: 320px !important; }
.max-w-md { max-width: 600px !important; }
.max-w-lg { max-width: 900px !important; }
.max-w-xl { max-width: 1100px !important; }
.max-w-2xl { max-width: 1400px !important; }

/* Border utilities */
.border { border: 1px solid var(--border) !important; }
.border-0 { border: none !important; }
.border-danger { border-color: var(--color-danger, #dc2626) !important; }
.rounded { border-radius: var(--border-radius, 8px) !important; }
.rounded-sm { border-radius: 4px !important; }

/* Background utilities */
.bg-transparent { background: transparent !important; }
.bg-surface { background: var(--color-background, var(--bg)) !important; }
.bg-card { background: var(--card) !important; }
.bg-danger-subtle { background: var(--danger-alpha-05) !important; }

/* Overflow utilities */
.overflow-auto { overflow: auto !important; }
.overflow-x-auto { overflow-x: auto !important; }
.overflow-hidden { overflow: hidden !important; }
.text-ellipsis { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* SVG icon alignment - common pattern */
.icon-inline {
  vertical-align: text-bottom;
  margin-right: 6px;
}

.icon-inline-lg {
  vertical-align: text-bottom;
  margin-right: 8px;
}

/* Card container utilities */
.card-centered {
  max-width: 1100px;
  margin: 16px auto;
}

.card-wide {
  max-width: 1400px;
  margin: 16px auto;
}

/* Alert message containers (hidden by default) */
.alert-message {
  display: none;
}

/* Danger zone styling */
.danger-zone {
  border-color: var(--color-danger) !important;
  background: var(--danger-alpha-05) !important;
}

.danger-zone-title {
  color: var(--color-danger);
}

.danger-zone-inner {
  padding: 16px;
  background: var(--color-background, var(--bg));
  border-radius: 8px;
  border: 1px solid var(--color-border, var(--border));
}

/* Delete confirmation styling */
.delete-warning-box {
  background: var(--alert-danger-bg);
  border: 1px solid var(--alert-danger-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.delete-warning-title {
  margin: 0 0 8px;
  font-weight: var(--font-weight-semibold);
  color: var(--alert-danger-text);
}

.delete-warning-text {
  margin: 0;
  color: var(--muted-ink);
  font-size: var(--font-size-xs);
}

.delete-code {
  background: var(--danger-alpha-15);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  color: var(--alert-danger-text);
  font-weight: var(--font-weight-semibold);
}

.input-danger {
  border-color: var(--alert-danger-border) !important;
}

/* Button styles */
.btn-danger-solid {
  background: var(--color-danger) !important;
  border-color: var(--color-danger) !important;
  color: var(--text-inverse) !important;
}

.btn-danger-cancel {
  background: var(--color-danger) !important;
  border-color: var(--color-danger) !important;
}

/* Stats summary icon backgrounds */
.stats-icon-success {
  background: var(--gradient-success);
}

.stats-icon-orange {
  background: var(--gradient-orange);
}

.stats-icon-blue {
  background: var(--gradient-blue);
}

.stats-icon-purple {
  background: var(--gradient-purple);
}

/* Clear all button style */
.btn-link-muted {
  border: 0;
  background: transparent;
  padding: 0;
  color: var(--muted-ink);
  cursor: pointer;
}

.btn-link-muted:hover {
  color: var(--ink);
  text-decoration: underline;
}

/* Dark mode utilities */
[data-theme="dark"] .delete-warning-box {
  background: var(--alert-danger-bg);
  border-color: var(--alert-danger-border);
}

[data-theme="dark"] .delete-warning-title {
  color: var(--alert-danger-text);
}

[data-theme="dark"] .delete-warning-text {
  color: var(--muted-ink);
}

[data-theme="dark"] .delete-code {
  background: var(--danger-alpha-20);
  color: var(--alert-danger-text);
}

[data-theme="dark"] .input-danger {
  border-color: var(--danger-alpha-50) !important;
}

[data-theme="dark"] .danger-zone-inner {
  background: var(--card);
  border-color: var(--border);
}

/* Form helper text under inputs */
.form-helper {
  text-align: center;
  margin-top: 12px;
  font-size: 14px;
  color: var(--muted-ink);
}

/* Features section margins */
.features-section {
  margin-top: 32px;
}

.features-section--compact {
  margin-top: 20px;
}

/* Disclaimer text */
.disclaimer-text {
  margin-top: 28px;
  color: var(--muted-ink);
  font-size: 14px;
}

/* FAQ intro text */
.faq-intro {
  text-align: center;
  color: var(--muted-ink);
  margin-bottom: var(--spacing-3xl);
}

/* Admin panel utilities */
.admin-card {
  max-width: 1100px;
  margin: 16px auto;
}

.admin-card-wide {
  max-width: 1300px;
  margin: 16px auto;
}

.admin-card-xl {
  max-width: 1400px;
  margin: 16px auto;
}

/* Stats row with counts */
.stats-summary-row {
  padding: 16px 0 8px;
  border-bottom: 1px solid var(--border);
}

.stats-summary-text {
  margin: 0;
  font-size: 14px;
  color: var(--muted-ink);
}

.stats-summary-text strong {
  color: var(--ink);
}

/* Table utilities */
.table-container {
  overflow-x: auto;
}

.table-full {
  width: 100%;
  margin-top: 16px;
}

/* Pagination */
.pagination-wrapper {
  margin-top: 24px;
  text-align: center;
}

.pagination-info {
  margin: 0 12px;
  color: var(--muted-ink);
}

/* Form layout utilities */
.form-flex {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.form-flex h4 {
  margin: 0;
}

.form-row-flex {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.form-group-sm { flex: 0 0 120px; }
.form-group-md { flex: 1; min-width: 150px; }
.form-group-lg { flex: 1; min-width: 200px; }
.form-group-xl { flex: 2; min-width: 250px; }
.form-group-auto { flex: 0 0 auto; align-self: flex-end; }

/* Empty state styling */
.empty-state-container {
  display: none;
  padding: 48px 24px;
}

.empty-state-icon {
  margin: 0 auto 16px;
}

.empty-state-icon svg {
  color: var(--muted-ink);
}

/* Legal disclaimer */
.legal-text {
  margin-top: var(--spacing-lg);
  margin-bottom: 0;
  font-size: var(--font-size-xs);
  color: var(--muted-ink);
}

.legal-text a {
  color: inherit;
}

/* Status badges */
.status-pending { color: var(--warning-dark); }
.status-active { color: var(--alert-success-text); }
.status-expired { color: var(--alert-danger-text); }
.status-cancelled { color: var(--gray-600); }
.status-trial { color: var(--warning-dark); }

/* Link accent color */
.link-accent {
  color: var(--accent, var(--strava-orange));
  text-decoration: underline;
}

/* Visibility toggle utilities */
.hidden-label {
  visibility: hidden;
}

/* Button size utilities */
.btn-sm {
  padding: 4px 8px !important;
  font-size: 12px !important;
}

.btn-revoke {
  color: var(--color-danger) !important;
}