/**
 * design-system.css
 * Jednotný design systém pro Jizerky pro Vás
 * Světlý a tmavý režim s WCAG 2.1 AA compliance
 */

html, body {
    max-width: 100%;
}

body {
    overflow-x: hidden;
}

/* ============================================
   CSS CUSTOM PROPERTIES (PROMĚNNÉ)
   ============================================ */

:root {
    /* === BARVY - SVĚTLÝ REŽIM === */
    
    /* Primární barvy */
    --color-primary: #1e3c72;
    --color-primary-light: #2a5298;
    --color-primary-dark: #162b4d;
    --color-primary-gradient: linear-gradient(to right, #1e3c72, #2a5298);
    
    /* Sekundární barvy */
    --color-secondary: #ffbd80;
    --color-secondary-light: #ffcc99;
    --color-secondary-dark: #ff9800;
    
    /* Pozadí */
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f5;
    --bg-tertiary: #e0e1ff;
    --bg-overlay: rgba(255, 255, 255, 0.95);
    
    /* Text */
    --text-primary: #333333;
    --text-secondary: #666666;
    --text-tertiary: #999999;
    --text-inverse: #ffffff;
    
    /* Odkazy */
    --link-color: #1e3c72;
    --link-hover: #2a5298;
    --link-visited: #162b4d;
    
    /* Borders */
    --border-color: #dddddd;
    --border-color-light: #eeeeee;
    --border-radius: 8px;
    --border-radius-small: 4px;
    --border-radius-large: 12px;
    
    /* Stíny */
    --shadow-small: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 12px rgba(0, 0, 0, 0.15);
    --shadow-large: 0 10px 30px rgba(0, 0, 0, 0.2);
    
    /* Stavy */
    --color-success: #4caf50;
    --color-warning: #ff9800;
    --color-error: #d32f2f;
    --color-info: #2196f3;
    
    /* === TYPOGRAFIE === */
    --font-family-base: 'Roboto', Arial, Verdana, sans-serif;
    --font-family-heading: 'Roboto', Arial, sans-serif;
    
    --font-size-base: 16px;
    --font-size-small: 0.875rem;    /* 14px */
    --font-size-large: 1.125rem;    /* 18px */
    
    /* Velikosti nadpisů */
    --font-size-h1: 2.5rem;         /* 40px */
    --font-size-h2: 2rem;           /* 32px */
    --font-size-h3: 1.75rem;        /* 28px */
    --font-size-h4: 1.5rem;         /* 24px */
    --font-size-h5: 1.25rem;        /* 20px */
    --font-size-h6: 1rem;           /* 16px */
    
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-bold: 700;
    --font-weight-black: 900;
    
    --line-height-base: 1.6;
    --line-height-heading: 1.2;
    
    /* === SPACING === */
    --spacing-xs: 0.25rem;          /* 4px */
    --spacing-sm: 0.5rem;           /* 8px */
    --spacing-md: 1rem;             /* 16px */
    --spacing-lg: 1.5rem;           /* 24px */
    --spacing-xl: 2rem;             /* 32px */
    --spacing-2xl: 3rem;            /* 48px */
    --spacing-3xl: 4rem;            /* 64px */
    
    /* === BREAKPOINTS === */
    --breakpoint-mobile: 768px;
    --breakpoint-tablet: 1024px;
    --breakpoint-desktop: 1200px;
    
    /* === TRANSITIONS === */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ============================================
   TMAVÝ REŽIM
   ============================================ */

body.dark-mode {
    /* Primární barvy */
    --color-primary: #2a5298;
    --color-primary-light: #4a7bc8;
    --color-primary-dark: #1f3d6e;
    --color-primary-gradient: linear-gradient(to right, #1f3d6e, #2a5298);
    
    /* Sekundární barvy */
    --color-secondary: #ffcc99;
    --color-secondary-light: #ffd9b3;
    --color-secondary-dark: #ffbd80;
    
    /* Pozadí */
    --bg-primary: #0F0F1E;
    --bg-secondary: #1A1A2E;
    --bg-tertiary: #16213E;
    --bg-overlay: rgba(15, 15, 30, 0.95);
    
    /* Text */
    --text-primary: #E0E0E0;
    --text-secondary: #B0B0B0;
    --text-tertiary: #808080;
    --text-inverse: #1A1A2E;
    
    /* Odkazy */
    --link-color: #4a7bc8;
    --link-hover: #6a9bd8;
    --link-visited: #3a6ba8;
    
    /* Borders */
    --border-color: #2d2d2d;
    --border-color-light: #3d3d3d;
    
    /* Stíny */
    --shadow-small: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-medium: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-large: 0 10px 30px rgba(0, 0, 0, 0.5);
    
    /* Stavy */
    --color-success: #66bb6a;
    --color-warning: #ffa726;
    --color-error: #ef5350;
    --color-info: #42a5f5;
}

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

/* Pouze box-sizing, BEZ resetu margin/padding */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
}

body {
    /* Pouze transitions pro dark mode, ŽÁDNÉ přímé styly */
    transition: background-color var(--transition-base), color var(--transition-base);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Body styly - aplikují se pouze pokud je třída .design-system-enabled */
body.design-system-enabled {
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--text-primary);
    background-color: var(--bg-primary);
}

/* KRITICKÉ: Background pro body v dark mode */
body.dark-mode {
    background-color: var(--bg-primary) !important;
}

/* ============================================
   TYPOGRAFIE - NADPISY
   ============================================ */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-family-heading);
    line-height: var(--line-height-heading);
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: var(--font-size-h1);
    font-weight: var(--font-weight-black);
}

h2 {
    font-size: var(--font-size-h2);
}

h3 {
    font-size: var(--font-size-h3);
}

h4 {
    font-size: var(--font-size-h4);
}

h5 {
    font-size: var(--font-size-h5);
}

h6 {
    font-size: var(--font-size-h6);
}

/* ============================================
   TYPOGRAFIE - TEXT
   ============================================ */

p {
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

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

a:hover,
a:focus {
    color: var(--link-hover);
    text-decoration: underline;
}

a:visited {
    color: var(--link-visited);
}

strong, b {
    font-weight: var(--font-weight-bold);
}

em, i {
    font-style: italic;
}

/* ============================================
   KONTEJNERY & LAYOUT
   ============================================ */

.container {
    max-width: var(--breakpoint-desktop);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.container-fluid {
    width: 100%;
    padding: 0 var(--spacing-md);
}

.section {
    padding: var(--spacing-2xl) 0;
}

.section-small {
    padding: var(--spacing-xl) 0;
}

.section-large {
    padding: var(--spacing-3xl) 0;
}

/* ============================================
   KARTY & BOXY
   ============================================ */

.card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-small);
    transition: box-shadow var(--transition-base);
}

.card:hover {
    box-shadow: var(--shadow-medium);
}

.card-header {
    padding-bottom: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--border-color);
}

.card-title {
    font-size: var(--font-size-h4);
    font-weight: var(--font-weight-bold);
    margin-bottom: 0;
}

.card-body {
    color: var(--text-primary);
}

.card-footer {
    padding-top: var(--spacing-md);
    margin-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

/* ============================================
   TLAČÍTKA
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    text-align: center;
    text-decoration: none;
    border: 1px solid transparent;
    border-radius: var(--border-radius-small);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
    user-select: none;
}

.btn:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Primární tlačítko */
.btn-primary {
    background: var(--color-primary-gradient);
    color: var(--text-inverse);
    border-color: var(--color-primary);
}

.btn-primary:hover,
.btn-primary:focus {
    background: var(--color-primary-dark);
    text-decoration: none;
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

/* Sekundární tlačítko */
.btn-secondary {
    background-color: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-secondary:hover,
.btn-secondary:focus {
    background-color: var(--color-primary);
    color: var(--text-inverse);
    text-decoration: none;
}

/* Outline tlačítko */
.btn-outline {
    background-color: transparent;
    color: var(--text-primary);
    border-color: var(--border-color);
}

.btn-outline:hover,
.btn-outline:focus {
    background-color: var(--bg-secondary);
    border-color: var(--color-primary);
    text-decoration: none;
}

/* Velikosti tlačítek */
.btn-small {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-small);
}

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

/* Disabled stav */
.btn:disabled,
.btn.disabled {
    opacity: 0.6;
    cursor: not-allowed;
    pointer-events: none;
}

/* ============================================
   FORMULÁŘE
   ============================================ */

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: var(--font-weight-medium);
    color: var(--text-primary);
}

.form-control {
    display: block;
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-base);
    font-family: var(--font-family-base);
    line-height: var(--line-height-base);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-small);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(30, 60, 114, 0.1);
}

.form-control::placeholder {
    color: var(--text-tertiary);
}

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

/* ============================================
   UTILITY TŘÍDY
   ============================================ */

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

/* Text colors */
.text-primary { color: var(--color-primary); }
.text-secondary { color: var(--text-secondary); }
.text-muted { color: var(--text-tertiary); }
.text-inverse { color: var(--text-inverse); }
.text-success { color: var(--color-success); }
.text-warning { color: var(--color-warning); }
.text-error { color: var(--color-error); }

/* Background colors */
.bg-primary { background-color: var(--bg-primary); }
.bg-secondary { background-color: var(--bg-secondary); }
.bg-tertiary { background-color: var(--bg-tertiary); }

/* Spacing utilities */
.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.mt-5 { margin-top: var(--spacing-xl); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }

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

/* Flex utilities */
.flex-row { flex-direction: row; }
.flex-column { flex-direction: column; }
.justify-start { justify-content: flex-start; }
.justify-center { justify-content: center; }
.justify-end { justify-content: flex-end; }
.justify-between { justify-content: space-between; }
.align-start { align-items: flex-start; }
.align-center { align-items: center; }
.align-end { align-items: flex-end; }

/* ============================================
   RESPONZIVITA
   ============================================ */

@media (max-width: 768px) {
    :root {
        --font-size-h1: 2rem;
        --font-size-h2: 1.75rem;
        --font-size-h3: 1.5rem;
        --font-size-h4: 1.25rem;
    }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .section {
        padding: var(--spacing-xl) 0;
    }
}

/* ============================================
   ACCESSIBILITY - FOCUS STYLES
   ============================================ */

*:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Skip link pro klávesovou navigaci */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary);
    color: var(--text-inverse);
    padding: var(--spacing-sm) var(--spacing-md);
    text-decoration: none;
    z-index: 100;
}

.skip-link:focus {
    top: 0;
}

/* ============================================
   PREFERS REDUCED MOTION
   ============================================ */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

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

/* === VYSOKÝ KONTRAST === */
body.high-contrast {
    --text-primary: #000000;
    --text-secondary: #1a1a1a;
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f5;
    --link-color: #0000ee;
    --link-hover: #0000cc;
    --border-color: #000000;
}

body.high-contrast.dark-mode {
    --text-primary: #ffffff;
    --text-secondary: #e0e0e0;
    --bg-primary: #000000;
    --bg-secondary: #1a1a1a;
    --link-color: #00ffff;
    --link-hover: #00cccc;
    --border-color: #ffffff;
}

/* Zvýšení kontrastu pro tlačítka */
body.high-contrast .btn {
    border-width: 3px;
    font-weight: bold;
}

body.high-contrast .btn-primary {
    background: #000000;
    color: #ffffff;
    border-color: #000000;
}

body.high-contrast.dark-mode .btn-primary {
    background: #ffffff;
    color: #000000;
    border-color: #ffffff;
}

/* Zvýšení kontrastu pro odkazy */
body.high-contrast a {
    text-decoration: underline;
    font-weight: bold;
}

/* Zvýšení kontrastu pro formuláře */
body.high-contrast .form-control {
    border-width: 2px;
    border-color: #000000;
}

body.high-contrast.dark-mode .form-control {
    border-color: #ffffff;
}

/* === VYPNUTÍ ANIMACÍ === */
body.no-animations,
body.no-animations *,
body.no-animations *::before,
body.no-animations *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
}

/* === TEXT-TO-SPEECH ZVÝRAZNĚNÍ === */
.tts-reading {
    background-color: #ffeb3b !important;
    color: #000000 !important;
    outline: 3px solid #ff9800;
    outline-offset: 2px;
    animation: tts-pulse 0.5s ease-in-out;
}

@keyframes tts-pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

/* === SKIP LINK (pro klávesovou navigaci) === */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary);
    color: var(--text-inverse);
    padding: var(--spacing-sm) var(--spacing-md);
    text-decoration: none;
    z-index: 10000;
    border-radius: 0 0 8px 0;
    font-weight: bold;
    transition: top 0.3s ease;
}

.skip-link:focus {
    top: 0;
    outline: 3px solid #ffcc99;
    outline-offset: 2px;
}

/* === FOCUS VISIBLE ENHANCEMENT === */
body.highlight-links *:focus-visible {
    outline: 4px solid #ff9800;
    outline-offset: 4px;
}

/* ============================================
   ACCESSIBILITY PANEL - STATUS COLORS
   ============================================ */

.tts-status {
    padding: 0.5rem;
    border-radius: 4px;
    font-size: 0.85rem;
    margin-top: 0.5rem;
}

.tts-status-info {
    background: #e3f2fd;
    color: #1565c0;
    border-left: 3px solid #2196f3;
}

.tts-status-success {
    background: #e8f5e9;
    color: #2e7d32;
    border-left: 3px solid #4caf50;
}

.tts-status-warning {
    background: #fff3e0;
    color: #e65100;
    border-left: 3px solid #ff9800;
}

.tts-status-error {
    background: #ffebee;
    color: #c62828;
    border-left: 3px solid #f44336;
}

/* Tmavý režim - status */
body.dark-mode .tts-status-info {
    background: #0d47a1;
    color: #bbdefb;
}

body.dark-mode .tts-status-success {
    background: #1b5e20;
    color: #c8e6c9;
}

body.dark-mode .tts-status-warning {
    background: #e65100;
    color: #ffe0b2;
}

body.dark-mode .tts-status-error {
    background: #b71c1c;
    color: #ffcdd2;
}