/**
 * EpicDecks Core – framework CSS
 * 
 * Clean, minimalist stylesheet
 * Optimized for card game e-commerce
 * 
 * @package EpicDecks_Core
 * @version 1.0.0
 */

/* ============================================
   CSS VARIABLES (Design Tokens)
   Změň barvy a mezery na jednom místě!
   ============================================ */

:root {
    /* ===== BARVY ===== */
    
    /* Hlavní barvy */
    --epicdecks-primary: #000000;           /* Černá - hlavní barva */
    --epicdecks-secondary: #FFFFFF;         /* Bílá - pozadí */
    --epicdecks-accent: #F5F5F5;            /* Světle šedá - jemný kontrast */
    
    /* Textové barvy */
    --epicdecks-text: #333333;              /* Tmavě šedá - hlavní text */
    --epicdecks-text-light: #777777;        /* Šedá - vedlejší text */
    --epicdecks-text-muted: #999999;        /* Světle šedá - neaktivní text */
    
    /* Ohraničení */
    --epicdecks-border: #E5E5E5;            /* Světlé ohraničení */
    --epicdecks-border-dark: #CCCCCC;       /* Tmavší ohraničení */
    
    /* Stavy a oznámení */
    --epicdecks-success: #28A745;           /* Zelená - úspěch, skladem */
    --epicdecks-danger: #DC3545;            /* Červená - chyba, akce */
    --epicdecks-warning: #FFC107;           /* Žlutá - varování */
    --epicdecks-info: #17A2B8;              /* Modrá - informace, nové */
    
    /* ===== SPACING (Mezery) ===== */
    --spacing-xs: 4px;                   /* Extra malá mezera */
    --spacing-sm: 8px;                   /* Malá mezera */
    --spacing-md: 16px;                  /* Střední mezera (výchozí) */
    --spacing-lg: 24px;                  /* Velká mezera */
    --spacing-xl: 32px;                  /* Extra velká mezera */
    --spacing-2xl: 48px;                 /* 2x extra velká */
    --spacing-3xl: 64px;                 /* 3x extra velká */
    
    /* ===== TYPOGRAPHY (Písmo) ===== */
    
    /* Font Family */
    --font-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    
    /* Font Sizes */
    --font-size-xs: 12px;                /* Extra malé písmo */
    --font-size-sm: 14px;                /* Malé písmo */
    --font-size-base: 16px;              /* Výchozí velikost */
    --font-size-lg: 18px;                /* Velké písmo */
    --font-size-xl: 24px;                /* Extra velké písmo */
    --font-size-2xl: 32px;               /* 2x extra velké */
    --font-size-3xl: 48px;               /* 3x extra velké (nadpisy) */
    
    /* Font Weights */
    --font-weight-normal: 400;           /* Normální tloušťka */
    --font-weight-medium: 500;           /* Střední tloušťka */
    --font-weight-bold: 700;             /* Tučné */
    
    /* Line Heights */
    --line-height-tight: 1.2;            /* Těsný řádkování */
    --line-height-base: 1.6;             /* Výchozí řádkování */
    --line-height-relaxed: 1.8;          /* Volné řádkování */
    
    /* ===== TRANSITIONS (Animace) ===== */
    --transition-fast: 0.15s ease;       /* Rychlá animace */
    --transition-base: 0.3s ease;        /* Standardní animace */
    --transition-slow: 0.5s ease;        /* Pomalá animace */
    
    /* ===== SHADOWS (Stíny) ===== */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);              /* Jemný stín */
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);               /* Střední stín */
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);             /* Velký stín */
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);            /* Extra velký stín */
    --shadow-2xl: 0 25px 50px rgba(0, 0, 0, 0.25);           /* Masivní stín */
    
    /* ===== BORDER RADIUS (Zaoblení rohů) ===== */
    --radius-sm: 4px;                    /* Malé zaoblení */
    --radius-md: 8px;                    /* Střední zaoblení */
    --radius-lg: 12px;                   /* Velké zaoblení */
    --radius-xl: 16px;                   /* Extra velké zaoblení */
    --radius-full: 9999px;               /* Úplně zaoblené (kruhy) */
    
    /* ===== Z-INDEX (Vrstvy) ===== */
    --z-dropdown: 1000;                  /* Dropdowny */
    --z-sticky: 1020;                    /* Sticky header */
    --z-modal-backdrop: 1040;            /* Modal pozadí */
    --z-modal: 1050;                     /* Modal obsah */
    --z-tooltip: 1070;                   /* Tooltips */
    --z-notification: 1090;              /* Notifikace */
    
    /* ===== LAYOUT (Rozložení) ===== */
    --container-max-width: 1400px;       /* Max šířka containeru */
    --container-max-width-wide: 1400px;  /* Široký container */
    --container-max-width-narrow: 800px; /* Úzký container */
    
    /* ===== PRODUCT CARD ===== */
    --card-image-ratio: 140%;            /* 5:7 poměr pro karty (Magic, Pokémon) */
    --card-border-width: 1px;
    --card-hover-lift: -2px;             /* Jak vysoko se zvedne při hoveru */
    
    /* ===== HEADER ===== */
    --header-height: 80px;               /* Výška hlavičky */
    --header-height-sticky: 60px;        /* Výška při scrollu */
}

/* ============================================
   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-primary);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--epicdecks-text);
    background-color: var(--epicdecks-secondary);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition-fast);
}

a:hover {
    opacity: 0.8;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

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

.epicdecks-container {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.epicdecks-container--wide {
    max-width: 1400px;
}

.epicdecks-container--narrow {
    max-width: 800px;
}

/* Flexbox Utilities */
.epicdecks-flex {
    display: flex;
}

.epicdecks-flex--center {
    align-items: center;
    justify-content: center;
}

.epicdecks-flex--between {
    justify-content: space-between;
}

.epicdecks-flex--column {
    flex-direction: column;
}

.epicdecks-flex--wrap {
    flex-wrap: wrap;
}

/* Grid Utilities */
.epicdecks-grid {
    display: grid;
    gap: var(--spacing-md);
}

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

.epicdecks-grid--3 {
    grid-template-columns: repeat(3, 1fr);
}

.epicdecks-grid--4 {
    grid-template-columns: repeat(4, 1fr);
}

.epicdecks-grid--5 {
    grid-template-columns: repeat(5, 1fr);
}

/* Responsive Grid (auto-fit) */
.epicdecks-grid--auto {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

/* Spacing Utilities */
.epicdecks-mt-0 { margin-top: 0; }
.epicdecks-mt-sm { margin-top: var(--spacing-sm); }
.epicdecks-mt-md { margin-top: var(--spacing-md); }
.epicdecks-mt-lg { margin-top: var(--spacing-lg); }
.epicdecks-mt-xl { margin-top: var(--spacing-xl); }

.epicdecks-mb-0 { margin-bottom: 0; }
.epicdecks-mb-sm { margin-bottom: var(--spacing-sm); }
.epicdecks-mb-md { margin-bottom: var(--spacing-md); }
.epicdecks-mb-lg { margin-bottom: var(--spacing-lg); }
.epicdecks-mb-xl { margin-bottom: var(--spacing-xl); }

.epicdecks-p-0 { padding: 0; }
.epicdecks-p-sm { padding: var(--spacing-sm); }
.epicdecks-p-md { padding: var(--spacing-md); }
.epicdecks-p-lg { padding: var(--spacing-lg); }
.epicdecks-p-xl { padding: var(--spacing-xl); }

/* Text Utilities */
.epicdecks-text-center { text-align: center; }
.epicdecks-text-left { text-align: left; }
.epicdecks-text-right { text-align: right; }

.epicdecks-text-sm { font-size: var(--font-size-sm); }
.epicdecks-text-base { font-size: var(--font-size-base); }
.epicdecks-text-lg { font-size: var(--font-size-lg); }
.epicdecks-text-xl { font-size: var(--font-size-xl); }

.epicdecks-text-muted { color: var(--epicdecks-text-light); }
.epicdecks-text-bold { font-weight: var(--font-weight-bold); }

/* Visibility Utilities */
.epicdecks-hidden {
    display: none !important;
}

.epicdecks-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;
}

/* ============================================
   BUTTON STYLES
   ============================================ */

.epicdecks-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    text-align: center;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.epicdecks-btn:hover {
    opacity: 1;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.epicdecks-btn:active {
    transform: translateY(0);
}

.epicdecks-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* Button Variants */
.epicdecks-btn--primary {
    background-color: var(--epicdecks-primary);
    color: var(--epicdecks-secondary);
}

.epicdecks-btn--primary:hover {
    background-color: #333333;
}

.epicdecks-btn--secondary {
    background-color: var(--epicdecks-accent);
    color: var(--epicdecks-primary);
    border-color: var(--epicdecks-border);
}

.epicdecks-btn--secondary:hover {
    background-color: #E0E0E0;
}

.epicdecks-btn--outline {
    background-color: transparent;
    color: var(--epicdecks-primary);
    border-color: var(--epicdecks-primary);
}

.epicdecks-btn--outline:hover {
    background-color: var(--epicdecks-primary);
    color: var(--epicdecks-secondary);
}

.epicdecks-btn--success {
    background-color: var(--epicdecks-success);
    color: var(--epicdecks-secondary);
}

.epicdecks-btn--danger {
    background-color: var(--epicdecks-danger);
    color: var(--epicdecks-secondary);
}

/* Button Sizes */
.epicdecks-btn--sm {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-sm);
}

.epicdecks-btn--lg {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-lg);
}

.epicdecks-btn--full {
    width: 100%;
}

/* ============================================
   BADGE STYLES (Product Cards)
   ============================================ */

.epicdecks-badge {
    display: inline-flex;
    align-items: center;
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-bold);
    text-transform: uppercase;
    border-radius: var(--radius-sm);
    letter-spacing: 0.5px;
}

.epicdecks-badge--sale {
    background-color: var(--epicdecks-danger);
    color: var(--epicdecks-secondary);
}

.epicdecks-badge--new {
    background-color: var(--epicdecks-info);
    color: var(--epicdecks-secondary);
}

.epicdecks-badge--stock {
    background-color: var(--epicdecks-success);
    color: var(--epicdecks-secondary);
}

.epicdecks-badge--out-of-stock {
    background-color: var(--epicdecks-text-muted);
    color: var(--epicdecks-secondary);
}

/* ============================================
   CARD COMPONENT (Base for Product Cards)
   ============================================ */

.epicdecks-card {
    background-color: var(--epicdecks-secondary);
    border: 1px solid var(--epicdecks-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition-base);
}

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

.epicdecks-card__image {
    position: relative;
    width: 100%;
    padding-top: 140%; /* 5:7 ratio for card images */
    background-color: var(--epicdecks-accent);
    overflow: hidden;
}

.epicdecks-card__image img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.epicdecks-card__body {
    padding: var(--spacing-md);
}

.epicdecks-card__title {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--spacing-sm);
    color: var(--epicdecks-text);
}

.epicdecks-card__price {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: var(--epicdecks-primary);
}

.epicdecks-card__price--old {
    font-size: var(--font-size-sm);
    color: var(--epicdecks-text-muted);
    text-decoration: line-through;
    margin-right: var(--spacing-sm);
}

/* ============================================
   FORM STYLES
   ============================================ */

.epicdecks-input,
.epicdecks-select,
.epicdecks-textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-base);
    font-family: var(--font-primary);
    color: var(--epicdecks-text);
    background-color: var(--epicdecks-secondary);
    border: 1px solid var(--epicdecks-border);
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}

.epicdecks-input:focus,
.epicdecks-select:focus,
.epicdecks-textarea:focus {
    outline: none;
    border-color: var(--epicdecks-primary);
    box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.1);
}

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

.epicdecks-textarea {
    resize: vertical;
    min-height: 120px;
}

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

.epicdecks-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--epicdecks-border);
    border-top-color: var(--epicdecks-primary);
    border-radius: 50%;
    animation: epicdecks-spin 0.6s linear infinite;
}

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

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

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

/* Tablet */
@media (max-width: 768px) {
    :root {
        --font-size-base: 15px;
        --spacing-md: 12px;
        --spacing-lg: 20px;
    }
    
    .epicdecks-container {
        padding: 0 var(--spacing-sm);
    }
    
    .epicdecks-grid--3,
    .epicdecks-grid--4,
    .epicdecks-grid--5 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .epicdecks-hide-tablet {
        display: none !important;
    }
}

/* Mobile */
@media (max-width: 480px) {
    :root {
        --font-size-base: 14px;
        --font-size-lg: 16px;
        --font-size-xl: 20px;
    }
    
    .epicdecks-grid--2,
    .epicdecks-grid--3,
    .epicdecks-grid--4,
    .epicdecks-grid--5 {
        grid-template-columns: 1fr;
    }
    
    .epicdecks-btn {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: var(--font-size-sm);
    }
    
    .epicdecks-hide-mobile {
        display: none !important;
    }
}

/* Desktop */
@media (min-width: 1200px) {
    .epicdecks-hide-desktop {
        display: none !important;
    }
}

/* ============================================
   ACCESSIBILITY
   ============================================ */

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

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ============================================
   PRINT STYLES
   ============================================ */

@media print {
    .epicdecks-btn,
    .epicdecks-no-print {
        display: none !important;
    }
}