/* ============================================
   BonusCard.ai Design System v1.0
   Sprint 35D: Premium UI Overhaul
   Date: January 23, 2026
   ============================================ */

/* ============================================
   CSS Reset & Base Styles
   ============================================ */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: var(--font-body);
    color: var(--color-neutral-900);
    background: var(--color-neutral-50);
    line-height: 1.6;
}

/* ============================================
   Design Tokens
   ============================================ */
:root {
    /* ========== Colors ========== */

    /* Primary - Trust Blue */
    --color-primary-50: #EFF6FF;
    --color-primary-100: #DBEAFE;
    --color-primary-200: #BFDBFE;
    --color-primary-300: #93C5FD;
    --color-primary-400: #60A5FA;
    --color-primary-500: #3B82F6;
    --color-primary-600: #2563EB;
    --color-primary-700: #1D4ED8;
    --color-primary-800: #1E40AF;
    --color-primary-900: #1E3A8A;

    /* Secondary - Reward Gold */
    --color-gold-50: #FFFBEB;
    --color-gold-100: #FEF3C7;
    --color-gold-200: #FDE68A;
    --color-gold-300: #FCD34D;
    --color-gold-400: #FBBF24;
    --color-gold-500: #F59E0B;
    --color-gold-600: #D97706;
    --color-gold-700: #B45309;
    --color-gold-800: #92400E;
    --color-gold-900: #78350F;

    /* Neutral - Gray Scale */
    --color-neutral-50: #F9FAFB;
    --color-neutral-100: #F3F4F6;
    --color-neutral-200: #E5E7EB;
    --color-neutral-300: #D1D5DB;
    --color-neutral-400: #9CA3AF;
    --color-neutral-500: #6B7280;
    --color-neutral-600: #4B5563;
    --color-neutral-700: #374151;
    --color-neutral-800: #1F2937;
    --color-neutral-900: #111827;

    /* Success - Green */
    --color-success-50: #ECFDF5;
    --color-success-100: #D1FAE5;
    --color-success-200: #A7F3D0;
    --color-success-500: #10B981;
    --color-success-600: #059669;
    --color-success-700: #047857;

    /* Warning - Yellow */
    --color-warning-50: #FFFBEB;
    --color-warning-100: #FEF3C7;
    --color-warning-500: #F59E0B;
    --color-warning-600: #D97706;

    /* Error - Red */
    --color-error-50: #FEF2F2;
    --color-error-100: #FEE2E2;
    --color-error-500: #EF4444;
    --color-error-600: #DC2626;
    --color-error-700: #B91C1C;

    /* Info - Cyan */
    --color-info-50: #ECFEFF;
    --color-info-100: #CFFAFE;
    --color-info-500: #06B6D4;
    --color-info-600: #0891B2;

    /* Tier Colors */
    --color-tier-bronze: #CD7F32;
    --color-tier-silver: #C0C0C0;
    --color-tier-gold: #FFD700;
    --color-tier-platinum: #E5E4E2;

    /* ========== Gradients ========== */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-gold: linear-gradient(135deg, #F59E0B 0%, #FBBF24 100%);
    --gradient-success: linear-gradient(135deg, #10B981 0%, #059669 100%);
    --gradient-error: linear-gradient(135deg, #EF4444 0%, #DC2626 100%);
    --gradient-hero: linear-gradient(135deg, #0F172A 0%, #1E3A5F 50%, #1E40AF 100%);
    --gradient-card-shine: linear-gradient(135deg, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0) 50%);

    /* ========== Typography ========== */
    --font-display: 'Plus Jakarta Sans', 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-body: 'Inter', 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'SF Mono', 'Monaco', 'Consolas', monospace;

    /* Font Sizes */
    --text-xs: 0.75rem;      /* 12px */
    --text-sm: 0.875rem;     /* 14px */
    --text-base: 1rem;       /* 16px */
    --text-lg: 1.125rem;     /* 18px */
    --text-xl: 1.25rem;      /* 20px */
    --text-2xl: 1.5rem;      /* 24px */
    --text-3xl: 1.875rem;    /* 30px */
    --text-4xl: 2.25rem;     /* 36px */
    --text-5xl: 3rem;        /* 48px */
    --text-6xl: 3.75rem;     /* 60px */

    /* Font Weights */
    --font-normal: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;

    /* Line Heights */
    --leading-none: 1;
    --leading-tight: 1.25;
    --leading-snug: 1.375;
    --leading-normal: 1.5;
    --leading-relaxed: 1.625;
    --leading-loose: 2;

    /* ========== Spacing ========== */
    --space-0: 0;
    --space-1: 0.25rem;     /* 4px */
    --space-2: 0.5rem;      /* 8px */
    --space-3: 0.75rem;     /* 12px */
    --space-4: 1rem;        /* 16px */
    --space-5: 1.25rem;     /* 20px */
    --space-6: 1.5rem;      /* 24px */
    --space-8: 2rem;        /* 32px */
    --space-10: 2.5rem;     /* 40px */
    --space-12: 3rem;       /* 48px */
    --space-16: 4rem;       /* 64px */
    --space-20: 5rem;       /* 80px */
    --space-24: 6rem;       /* 96px */

    /* ========== Border Radius ========== */
    --radius-none: 0;
    --radius-sm: 0.125rem;   /* 2px */
    --radius-md: 0.375rem;   /* 6px */
    --radius-lg: 0.5rem;     /* 8px */
    --radius-xl: 0.75rem;    /* 12px */
    --radius-2xl: 1rem;      /* 16px */
    --radius-3xl: 1.5rem;    /* 24px */
    --radius-full: 9999px;

    /* ========== Shadows ========== */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.05);

    /* Glow Shadows */
    --shadow-glow-primary: 0 0 24px rgba(37, 99, 235, 0.3);
    --shadow-glow-gold: 0 0 24px rgba(245, 158, 11, 0.3);
    --shadow-glow-success: 0 0 24px rgba(16, 185, 129, 0.3);

    /* ========== Z-Index ========== */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;

    /* ========== Transitions ========== */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: 300ms cubic-bezier(0.68, -0.55, 0.265, 1.55);

    /* ========== Container Widths ========== */
    --container-sm: 640px;
    --container-md: 768px;
    --container-lg: 1024px;
    --container-xl: 1280px;
    --container-2xl: 1536px;
}

/* ============================================
   Utility Classes
   ============================================ */

/* Container */
.container {
    width: 100%;
    margin: 0 auto;
    padding: 0 var(--space-4);
}

@media (min-width: 640px) { .container { max-width: var(--container-sm); } }
@media (min-width: 768px) { .container { max-width: var(--container-md); } }
@media (min-width: 1024px) { .container { max-width: var(--container-lg); } }
@media (min-width: 1280px) { .container { max-width: var(--container-xl); } }
@media (min-width: 1536px) { .container { max-width: var(--container-2xl); } }

/* Card */
.card {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-neutral-100);
    transition: all var(--transition-base);
}

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

.card-header {
    margin-bottom: var(--space-4);
    padding-bottom: var(--space-4);
    border-bottom: 1px solid var(--color-neutral-100);
}

.card-title {
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
    color: var(--color-neutral-900);
}

.card-body {
    margin-bottom: var(--space-4);
}

.card-footer {
    margin-top: var(--space-4);
    padding-top: var(--space-4);
    border-top: 1px solid var(--color-neutral-100);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    border-radius: var(--radius-lg);
    font-weight: var(--font-semibold);
    font-size: var(--text-sm);
    line-height: var(--leading-tight);
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-md), var(--shadow-glow-primary);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), var(--shadow-glow-primary);
}

.btn-secondary {
    background: white;
    color: var(--color-neutral-700);
    border: 1px solid var(--color-neutral-200);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--color-neutral-50);
    border-color: var(--color-primary-500);
    color: var(--color-primary-600);
}

.btn-success {
    background: var(--gradient-success);
    color: white;
    box-shadow: var(--shadow-md), var(--shadow-glow-success);
}

.btn-success:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), var(--shadow-glow-success);
}

.btn-error {
    background: var(--gradient-error);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-error:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--color-primary-500);
    color: var(--color-primary-600);
}

.btn-outline:hover:not(:disabled) {
    background: var(--color-primary-50);
}

.btn-sm {
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-xs);
}

.btn-lg {
    padding: var(--space-4) var(--space-8);
    font-size: var(--text-base);
}

/* Badge */
.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    line-height: var(--leading-tight);
}

.badge-primary {
    background: var(--color-primary-100);
    color: var(--color-primary-700);
}

.badge-success {
    background: var(--color-success-100);
    color: var(--color-success-700);
}

.badge-warning {
    background: var(--color-warning-100);
    color: var(--color-warning-600);
}

.badge-error {
    background: var(--color-error-100);
    color: var(--color-error-700);
}

.badge-gold {
    background: var(--gradient-gold);
    color: white;
    box-shadow: var(--shadow-glow-gold);
}

/* Alert */
.alert {
    padding: var(--space-4);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-4);
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
}

.alert-success {
    background: var(--color-success-50);
    color: var(--color-success-700);
    border: 1px solid var(--color-success-200);
}

.alert-warning {
    background: var(--color-warning-50);
    color: var(--color-warning-600);
    border: 1px solid var(--color-warning-100);
}

.alert-error {
    background: var(--color-error-50);
    color: var(--color-error-700);
    border: 1px solid var(--color-error-200);
}

.alert-info {
    background: var(--color-info-50);
    color: var(--color-info-600);
    border: 1px solid var(--color-info-100);
}

/* Form Elements */
.form-group {
    margin-bottom: var(--space-5);
}

.form-label {
    display: block;
    margin-bottom: var(--space-2);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--color-neutral-700);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-base);
    line-height: var(--leading-tight);
    color: var(--color-neutral-900);
    background: white;
    border: 1px solid var(--color-neutral-300);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-primary-500);
    box-shadow: 0 0 0 3px var(--color-primary-100);
}

.form-input:disabled,
.form-select:disabled,
.form-textarea:disabled {
    background: var(--color-neutral-100);
    cursor: not-allowed;
}

.form-error {
    display: block;
    margin-top: var(--space-2);
    font-size: var(--text-sm);
    color: var(--color-error-600);
}

.form-help {
    display: block;
    margin-top: var(--space-2);
    font-size: var(--text-sm);
    color: var(--color-neutral-500);
}

/* Loading Spinner */
.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--color-neutral-200);
    border-top-color: var(--color-primary-500);
    border-radius: var(--radius-full);
    animation: spin 0.8s linear infinite;
}

.spinner-lg {
    width: 40px;
    height: 40px;
    border-width: 4px;
}

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

/* Loading State */
.loading {
    position: relative;
    pointer-events: none;
    opacity: 0.6;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 24px;
    height: 24px;
    margin: -12px 0 0 -12px;
    border: 3px solid var(--color-neutral-200);
    border-top-color: var(--color-primary-500);
    border-radius: var(--radius-full);
    animation: spin 0.8s linear infinite;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--space-12) var(--space-4);
}

.empty-state-icon {
    font-size: var(--text-6xl);
    margin-bottom: var(--space-4);
    opacity: 0.3;
}

.empty-state-title {
    font-size: var(--text-xl);
    font-weight: var(--font-semibold);
    color: var(--color-neutral-900);
    margin-bottom: var(--space-2);
}

.empty-state-text {
    font-size: var(--text-base);
    color: var(--color-neutral-500);
    margin-bottom: var(--space-6);
}

/* Stats Card */
.stat-card {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-neutral-100);
    transition: all var(--transition-base);
}

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

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-bottom: var(--space-3);
}

.stat-icon-primary {
    background: var(--color-primary-100);
    color: var(--color-primary-600);
}

.stat-icon-gold {
    background: var(--color-gold-100);
    color: var(--color-gold-600);
}

.stat-icon-success {
    background: var(--color-success-100);
    color: var(--color-success-600);
}

.stat-value {
    font-size: var(--text-3xl);
    font-weight: var(--font-bold);
    color: var(--color-neutral-900);
    margin-bottom: var(--space-1);
}

.stat-label {
    font-size: var(--text-sm);
    color: var(--color-neutral-500);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat-change {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    margin-top: var(--space-2);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
}

.stat-change-up {
    color: var(--color-success-600);
}

.stat-change-down {
    color: var(--color-error-600);
}

/* ============================================
   Responsive Utilities
   ============================================ */

/* Hide/Show based on breakpoint */
.hidden-sm { display: none; }
@media (min-width: 640px) { .hidden-sm { display: initial; } }

.hidden-md { display: none; }
@media (min-width: 768px) { .hidden-md { display: initial; } }

.visible-sm { display: initial; }
@media (min-width: 640px) { .visible-sm { display: none; } }

/* ============================================
   Animation Classes
   ============================================ */

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-fade-in {
    animation: fadeIn var(--transition-base);
}

.animate-slide-in-up {
    animation: slideInUp var(--transition-slow);
}

.animate-slide-in-down {
    animation: slideInDown var(--transition-slow);
}

/* ============================================
   Accessibility
   ============================================ */

/* Focus Visible (keyboard navigation) */
*:focus-visible {
    outline: 2px solid var(--color-primary-500);
    outline-offset: 2px;
}

/* Skip to main content link */
.skip-to-main {
    position: absolute;
    top: -100px;
    left: 0;
    background: var(--color-primary-600);
    color: white;
    padding: var(--space-3) var(--space-5);
    text-decoration: none;
    border-radius: var(--radius-lg);
    z-index: var(--z-tooltip);
}

.skip-to-main:focus {
    top: var(--space-4);
    left: var(--space-4);
}

/* Screen reader only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* ============================================
   Print Styles
   ============================================ */

@media print {
    body {
        background: white;
    }

    .no-print {
        display: none !important;
    }

    .card {
        box-shadow: none;
        border: 1px solid var(--color-neutral-300);
    }
}