/**
 * Apple Design System for Najazdene.sk
 * Inspired by Apple's Human Interface Guidelines
 *
 * This file provides CSS custom properties and utility classes
 * for a modern, Apple-like design aesthetic.
 */

:root {
    /* ===== TYPOGRAPHY ===== */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    --font-family-mono: 'SF Mono', SFMono-Regular, ui-monospace, Menlo, Monaco, 'Cascadia Code', monospace;

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

    /* Font Sizes (using Apple's type scale) */
    --font-size-xs: 0.6875rem;    /* 11px */
    --font-size-sm: 0.75rem;      /* 12px */
    --font-size-base: 0.875rem;   /* 14px */
    --font-size-md: 1rem;         /* 16px */
    --font-size-lg: 1.125rem;     /* 18px */
    --font-size-xl: 1.25rem;      /* 20px */
    --font-size-2xl: 1.5rem;      /* 24px */
    --font-size-3xl: 1.875rem;    /* 30px */
    --font-size-4xl: 2.25rem;     /* 36px */
    --font-size-5xl: 3rem;        /* 48px */
    --font-size-6xl: 3.75rem;     /* 60px */

    /* Line Heights */
    --line-height-tight: 1.1;
    --line-height-snug: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.625;

    /* Letter Spacing */
    --letter-spacing-tight: -0.025em;
    --letter-spacing-normal: 0;
    --letter-spacing-wide: 0.025em;

    /* ===== COLORS - Light Mode ===== */
    /* Primary Palette (Apple Blue) */
    --color-primary: #0A84FF;
    --color-primary-hover: #0077ED;
    --color-primary-active: #006DD6;
    --color-primary-light: rgba(10, 132, 255, 0.1);

    /* Semantic Colors */
    --color-success: #30D158;
    --color-success-hover: #28BD4F;
    --color-success-light: rgba(48, 209, 88, 0.1);

    --color-warning: #FF9F0A;
    --color-warning-hover: #E68F09;
    --color-warning-light: rgba(255, 159, 10, 0.1);

    --color-danger: #FF453A;
    --color-danger-hover: #E63D33;
    --color-danger-light: rgba(255, 69, 58, 0.1);

    --color-info: #64D2FF;
    --color-info-light: rgba(100, 210, 255, 0.1);

    /* Neutral Palette */
    --color-text-primary: #1D1D1F;
    --color-text-secondary: #6E6E73;
    --color-text-tertiary: #86868B;
    --color-text-quaternary: #AEAEB2;
    --color-text-inverted: #FFFFFF;

    /* Backgrounds */
    --color-background: #FFFFFF;
    --color-background-secondary: #F5F5F7;
    --color-background-tertiary: #E8E8ED;
    --color-surface: #FFFFFF;
    --color-surface-elevated: #FFFFFF;

    /* Borders & Separators */
    --color-border: rgba(0, 0, 0, 0.1);
    --color-border-strong: rgba(0, 0, 0, 0.15);
    --color-separator: rgba(0, 0, 0, 0.08);

    /* ===== COLORS - Dark Mode ===== */
    --dark-color-primary: #0A84FF;
    --dark-color-primary-hover: #409CFF;

    --dark-color-success: #30D158;
    --dark-color-warning: #FF9F0A;
    --dark-color-danger: #FF453A;

    --dark-color-text-primary: #F5F5F7;
    --dark-color-text-secondary: #A1A1A6;
    --dark-color-text-tertiary: #6E6E73;

    --dark-background: #000000;
    --dark-background-secondary: #1C1C1E;
    --dark-background-tertiary: #2C2C2E;
    --dark-surface: #1C1C1E;
    --dark-surface-elevated: #2C2C2E;

    --dark-border: rgba(255, 255, 255, 0.1);
    --dark-separator: rgba(255, 255, 255, 0.08);

    /* ===== SPACING ===== */
    /* Based on 4px grid */
    --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: 0.25rem;     /* 4px */
    --radius-md: 0.5rem;      /* 8px */
    --radius-lg: 0.75rem;     /* 12px */
    --radius-xl: 1rem;        /* 16px */
    --radius-2xl: 1.25rem;    /* 20px */
    --radius-3xl: 1.5rem;     /* 24px */
    --radius-full: 9999px;

    /* ===== SHADOWS ===== */
    /* Apple-style subtle shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 12px 40px rgba(0, 0, 0, 0.16);
    --shadow-2xl: 0 24px 64px rgba(0, 0, 0, 0.24);

    /* Elevation shadows */
    --shadow-elevated: 0 2px 8px rgba(0, 0, 0, 0.08), 0 8px 24px rgba(0, 0, 0, 0.08);
    --shadow-floating: 0 4px 16px rgba(0, 0, 0, 0.12), 0 12px 40px rgba(0, 0, 0, 0.12);

    /* ===== TRANSITIONS ===== */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
    --transition-slower: 500ms ease;

    /* Apple-style spring transition */
    --transition-spring: 300ms cubic-bezier(0.25, 0.1, 0.25, 1);

    /* ===== Z-INDEX ===== */
    --z-base: 0;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal-backdrop: 400;
    --z-modal: 500;
    --z-popover: 600;
    --z-tooltip: 700;
    --z-toast: 800;

    /* ===== LAYOUT ===== */
    --max-width-sm: 640px;
    --max-width-md: 768px;
    --max-width-lg: 1024px;
    --max-width-xl: 1200px;
    --max-width-2xl: 1400px;

    /* Container padding */
    --container-padding: var(--space-4);
    --container-padding-lg: var(--space-6);
}

/* ===== DARK MODE ===== */
@media (prefers-color-scheme: dark) {
    :root {
        --color-primary: var(--dark-color-primary);
        --color-primary-hover: var(--dark-color-primary-hover);

        --color-success: var(--dark-color-success);
        --color-warning: var(--dark-color-warning);
        --color-danger: var(--dark-color-danger);

        --color-text-primary: var(--dark-color-text-primary);
        --color-text-secondary: var(--dark-color-text-secondary);
        --color-text-tertiary: var(--dark-color-text-tertiary);

        --color-background: var(--dark-background);
        --color-background-secondary: var(--dark-background-secondary);
        --color-background-tertiary: var(--dark-background-tertiary);
        --color-surface: var(--dark-surface);
        --color-surface-elevated: var(--dark-surface-elevated);

        --color-border: var(--dark-border);
        --color-separator: var(--dark-separator);

        /* Adjust shadows for dark mode */
        --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
        --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
        --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.4);
    }
}

/* Manual dark mode class override */
.dark {
    --color-primary: var(--dark-color-primary);
    --color-primary-hover: var(--dark-color-primary-hover);

    --color-success: var(--dark-color-success);
    --color-warning: var(--dark-color-warning);
    --color-danger: var(--dark-color-danger);

    --color-text-primary: var(--dark-color-text-primary);
    --color-text-secondary: var(--dark-color-text-secondary);
    --color-text-tertiary: var(--dark-color-text-tertiary);

    --color-background: var(--dark-background);
    --color-background-secondary: var(--dark-background-secondary);
    --color-background-tertiary: var(--dark-background-tertiary);
    --color-surface: var(--dark-surface);
    --color-surface-elevated: var(--dark-surface-elevated);

    --color-border: var(--dark-border);
    --color-separator: var(--dark-separator);
}

/* ===== BASE STYLES ===== */
*,
*::before,
*::after {
    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);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-regular);
    line-height: var(--line-height-normal);
    color: var(--color-text-primary);
    background-color: var(--color-background);
}

/* ===== TYPOGRAPHY UTILITIES ===== */
.text-xs { font-size: var(--font-size-xs); }
.text-sm { font-size: var(--font-size-sm); }
.text-base { font-size: var(--font-size-base); }
.text-md { font-size: var(--font-size-md); }
.text-lg { font-size: var(--font-size-lg); }
.text-xl { font-size: var(--font-size-xl); }
.text-2xl { font-size: var(--font-size-2xl); }
.text-3xl { font-size: var(--font-size-3xl); }
.text-4xl { font-size: var(--font-size-4xl); }
.text-5xl { font-size: var(--font-size-5xl); }

.font-regular { font-weight: var(--font-weight-regular); }
.font-medium { font-weight: var(--font-weight-medium); }
.font-semibold { font-weight: var(--font-weight-semibold); }
.font-bold { font-weight: var(--font-weight-bold); }

.text-primary { color: var(--color-text-primary); }
.text-secondary { color: var(--color-text-secondary); }
.text-tertiary { color: var(--color-text-tertiary); }

/* ===== APPLE-STYLE BUTTONS ===== */
.ads-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    line-height: 1;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-base);
    -webkit-tap-highlight-color: transparent;
}

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

/* Primary Button */
.ads-btn--primary {
    background-color: var(--color-primary);
    color: var(--color-text-inverted);
}

.ads-btn--primary:hover {
    background-color: var(--color-primary-hover);
    transform: scale(1.02);
}

.ads-btn--primary:active {
    background-color: var(--color-primary-active);
    transform: scale(0.98);
}

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

.ads-btn--secondary:hover {
    background-color: var(--color-background-tertiary);
}

/* Ghost Button */
.ads-btn--ghost {
    background-color: transparent;
    color: var(--color-primary);
}

.ads-btn--ghost:hover {
    background-color: var(--color-primary-light);
}

/* Button Sizes */
.ads-btn--sm {
    padding: var(--space-2) var(--space-4);
    font-size: var(--font-size-sm);
}

.ads-btn--lg {
    padding: var(--space-4) var(--space-6);
    font-size: var(--font-size-md);
}

/* ===== APPLE-STYLE CARDS ===== */
.ads-card {
    background-color: var(--color-surface);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    overflow: hidden;
    transition: box-shadow var(--transition-base), transform var(--transition-base);
}

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

.ads-card--elevated {
    box-shadow: var(--shadow-elevated);
    border: none;
}

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

.ads-card__header {
    padding: var(--space-4) var(--space-5);
    border-bottom: 1px solid var(--color-separator);
}

.ads-card__body {
    padding: var(--space-5);
}

.ads-card__footer {
    padding: var(--space-4) var(--space-5);
    border-top: 1px solid var(--color-separator);
    background-color: var(--color-background-secondary);
}

/* ===== APPLE-STYLE INPUTS ===== */
.ads-input {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-family: var(--font-family);
    font-size: var(--font-size-md);
    color: var(--color-text-primary);
    background-color: var(--color-background-secondary);
    border: 1px solid transparent;
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.ads-input::placeholder {
    color: var(--color-text-tertiary);
}

.ads-input:hover {
    background-color: var(--color-background-tertiary);
}

.ads-input:focus {
    outline: none;
    background-color: var(--color-surface);
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

.ads-input--error {
    border-color: var(--color-danger);
    background-color: var(--color-danger-light);
}

/* ===== APPLE-STYLE BADGES ===== */
.ads-badge {
    display: inline-flex;
    align-items: center;
    padding: var(--space-1) var(--space-2);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    line-height: 1;
    border-radius: var(--radius-full);
}

.ads-badge--primary {
    background-color: var(--color-primary-light);
    color: var(--color-primary);
}

.ads-badge--success {
    background-color: var(--color-success-light);
    color: var(--color-success);
}

.ads-badge--warning {
    background-color: var(--color-warning-light);
    color: var(--color-warning);
}

.ads-badge--danger {
    background-color: var(--color-danger-light);
    color: var(--color-danger);
}

/* ===== APPLE-STYLE ALERTS ===== */
.ads-alert {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    padding: var(--space-4);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-base);
}

.ads-alert--info {
    background-color: var(--color-info-light);
    color: var(--color-text-primary);
}

.ads-alert--success {
    background-color: var(--color-success-light);
    color: var(--color-text-primary);
}

.ads-alert--warning {
    background-color: var(--color-warning-light);
    color: var(--color-text-primary);
}

.ads-alert--danger {
    background-color: var(--color-danger-light);
    color: var(--color-text-primary);
}

/* ===== LAYOUT UTILITIES ===== */
.ads-container {
    width: 100%;
    max-width: var(--max-width-xl);
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--container-padding);
    padding-right: var(--container-padding);
}

@media (min-width: 1024px) {
    .ads-container {
        padding-left: var(--container-padding-lg);
        padding-right: var(--container-padding-lg);
    }
}

/* Flex utilities */
.ads-flex { display: flex; }
.ads-flex-col { flex-direction: column; }
.ads-items-center { align-items: center; }
.ads-justify-center { justify-content: center; }
.ads-justify-between { justify-content: space-between; }
.ads-gap-2 { gap: var(--space-2); }
.ads-gap-4 { gap: var(--space-4); }
.ads-gap-6 { gap: var(--space-6); }

/* Grid utilities */
.ads-grid { display: grid; }
.ads-grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.ads-grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.ads-grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

@media (max-width: 768px) {
    .ads-grid-cols-2,
    .ads-grid-cols-3,
    .ads-grid-cols-4 {
        grid-template-columns: 1fr;
    }
}

/* Spacing utilities */
.ads-mt-4 { margin-top: var(--space-4); }
.ads-mt-6 { margin-top: var(--space-6); }
.ads-mt-8 { margin-top: var(--space-8); }
.ads-mb-4 { margin-bottom: var(--space-4); }
.ads-mb-6 { margin-bottom: var(--space-6); }
.ads-mb-8 { margin-bottom: var(--space-8); }
.ads-p-4 { padding: var(--space-4); }
.ads-p-6 { padding: var(--space-6); }
.ads-py-4 { padding-top: var(--space-4); padding-bottom: var(--space-4); }
.ads-py-6 { padding-top: var(--space-6); padding-bottom: var(--space-6); }
.ads-px-4 { padding-left: var(--space-4); padding-right: var(--space-4); }
.ads-px-6 { padding-left: var(--space-6); padding-right: var(--space-6); }

/* ===== ANIMATION UTILITIES ===== */
@keyframes ads-fade-in {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes ads-slide-up {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes ads-scale-in {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.ads-animate-fade-in {
    animation: ads-fade-in var(--transition-base) ease-out;
}

.ads-animate-slide-up {
    animation: ads-slide-up var(--transition-slow) ease-out;
}

.ads-animate-scale-in {
    animation: ads-scale-in var(--transition-slow) ease-out;
}

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

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

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