/* ═══════════════════════════════════════════════════════════════════════════════
   ITFRESH.RU — EXTENDED DESIGN SYSTEM
   ═══════════════════════════════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Black+Han+Sans&family=Josefin+Slab:wght@300;400;600&family=Quicksand:wght@400;500;600;700&display=swap');

/* ── DESIGN TOKENS ── */
:root {
    /* Core Colors */
    --bg: #fdf6ee;
    --bg-alt: #fff3e0;
    --bg-accent: #ffecd4;
    --bg-elevated: #fff8f2;

    /* Primary Orange Scale */
    --orange-50: #fff8f0;
    --orange-100: #ffecd4;
    --orange-200: #ffd9a8;
    --orange-300: #ffb366;
    --orange-400: #ff8c33;
    --orange-500: #d97000;
    --orange-600: #b85e00;
    --orange-700: #8b3a00;
    --orange-800: #6b2d00;
    --orange-900: #4a1f00;

    /* Semantic Colors */
    --primary: var(--orange-500);
    --primary-hover: var(--orange-600);
    --primary-light: var(--orange-100);
    --primary-dark: var(--orange-700);

    /* Text Colors */
    --text-primary: #1a0a00;
    --text-secondary: #2d1200;
    --text-muted: #6b3a10;
    --text-subtle: #a06030;
    --text-inverse: #ffffff;

    /* Border Colors */
    --border-light: rgba(217, 112, 0, 0.08);
    --border-medium: rgba(217, 112, 0, 0.18);
    --border-strong: rgba(217, 112, 0, 0.35);
    --border-accent: var(--orange-500);

    /* Shadow System */
    --shadow-xs: 0 1px 2px rgba(139, 58, 0, 0.05);
    --shadow-sm: 0 2px 4px rgba(139, 58, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(139, 58, 0, 0.12);
    --shadow-lg: 0 8px 24px rgba(139, 58, 0, 0.15);
    --shadow-xl: 0 16px 40px rgba(139, 58, 0, 0.18);
    --shadow-2xl: 0 24px 60px rgba(139, 58, 0, 0.25);

    /* Spacing Scale (8px base) */
    --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 */
    --space-32: 8rem;    /* 128px */

    /* Border Radius */
    --radius-none: 0;
    --radius-sm: 0.125rem;
    --radius-md: 0.25rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    --radius-2xl: 1rem;
    --radius-full: 9999px;

    /* Typography Scale */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;
    --text-6xl: 3.75rem;

    /* Font Families */
    --font-display: "Black Han Sans", sans-serif;
    --font-heading: "Josefin Slab", serif;
    --font-body: "Quicksand", sans-serif;

    /* Font Weights */
    --weight-light: 300;
    --weight-normal: 400;
    --weight-medium: 500;
    --weight-semibold: 600;
    --weight-bold: 700;

    /* Line Heights */
    --leading-tight: 1.25;
    --leading-snug: 1.375;
    --leading-normal: 1.5;
    --leading-relaxed: 1.625;
    --leading-loose: 2;

    /* Letter Spacing */
    --tracking-tighter: -0.05em;
    --tracking-tight: -0.025em;
    --tracking-normal: 0;
    --tracking-wide: 0.025em;
    --tracking-wider: 0.05em;
    --tracking-widest: 0.1em;

    /* Animation Timing */
    --ease-linear: linear;
    --ease-in: cubic-bezier(0.4, 0, 1, 1);
    --ease-out: cubic-bezier(0, 0, 0.2, 1);
    --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);

    /* Animation Durations */
    --duration-75: 75ms;
    --duration-100: 100ms;
    --duration-150: 150ms;
    --duration-200: 200ms;
    --duration-300: 300ms;
    --duration-500: 500ms;
    --duration-700: 700ms;
    --duration-1000: 1000ms;

    /* Dark Theme Preparation */
    --dark-bg: #0f0600;
    --dark-bg-alt: #1a0f00;
    --dark-text: #f5e6d3;
    --dark-text-muted: #c4a484;
    --dark-border: rgba(217, 112, 0, 0.2);
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    :root {
        --bg: var(--dark-bg);
        --bg-alt: var(--dark-bg-alt);
        --text-primary: var(--dark-text);
        --text-secondary: var(--dark-text);
        --text-muted: var(--dark-text-muted);
        --border-light: var(--dark-border);
        --border-medium: var(--dark-border);
    }
}

/* Manual Dark Mode Toggle */
[data-theme="dark"] {
    --bg: var(--dark-bg);
    --bg-alt: var(--dark-bg-alt);
    --text-primary: var(--dark-text);
    --text-secondary: var(--dark-text);
    --text-muted: var(--dark-text-muted);
    --border-light: var(--dark-border);
    --border-medium: var(--dark-border);
}

/* ── COMPONENT SYSTEM ── */

/* Button System */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-family: var(--font-heading);
    font-weight: var(--weight-semibold);
    font-size: var(--text-sm);
    letter-spacing: var(--tracking-wide);
    text-transform: uppercase;
    text-decoration: none;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: all var(--duration-200) var(--ease-out);
}

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

.btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(45deg, rgba(255, 255, 255, 0.1), transparent);
    transform: translateX(-100%);
    transition: transform var(--duration-300) var(--ease-out);
}

.btn:hover::before {
    transform: translateX(100%);
}

/* Button Variants */
.btn--primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-hover));
    color: var(--text-inverse);
    box-shadow: var(--shadow-md);
}

.btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.btn--secondary {
    background: transparent;
    border-color: var(--border-strong);
    color: var(--primary);
}

.btn--secondary:hover {
    background: var(--primary-light);
    border-color: var(--primary);
}

.btn--ghost {
    background: transparent;
    color: var(--primary);
}

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

/* Button Sizes */
.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);
}

.btn--xl {
    padding: var(--space-5) var(--space-10);
    font-size: var(--text-lg);
}

/* Card System */
.card {
    background: var(--bg-elevated);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    position: relative;
    overflow: hidden;
    transition: all var(--duration-300) var(--ease-out);
}

.card:hover {
    border-color: var(--border-medium);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

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

.card__title {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    color: var(--text-primary);
    margin-bottom: var(--space-2);
    letter-spacing: var(--tracking-wide);
}

.card__subtitle {
    font-family: var(--font-heading);
    font-size: var(--text-sm);
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: var(--tracking-widest);
}

.card__body {
    color: var(--text-secondary);
    line-height: var(--leading-relaxed);
}

.card__footer {
    margin-top: var(--space-6);
    padding-top: var(--space-4);
    border-top: 1px solid var(--border-light);
}

/* Card Variants */
.card--elevated {
    box-shadow: var(--shadow-lg);
    border-color: var(--border-medium);
}

.card--bordered {
    border: 2px solid var(--border-strong);
}

.card--accent {
    background: linear-gradient(135deg, var(--orange-50), var(--orange-100));
    border-color: var(--border-medium);
}

/* Form Elements */
.form-group {
    margin-bottom: var(--space-6);
}

.form-label {
    display: block;
    font-family: var(--font-heading);
    font-size: var(--text-sm);
    font-weight: var(--weight-semibold);
    color: var(--text-primary);
    margin-bottom: var(--space-2);
    letter-spacing: var(--tracking-wide);
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-family: var(--font-body);
    font-size: var(--text-base);
    color: var(--text-secondary);
    background: var(--bg-elevated);
    border: 1px solid var(--border-medium);
    border-radius: var(--radius-md);
    transition: all var(--duration-200) var(--ease-out);
}

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

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

.form-help {
    font-size: var(--text-xs);
    color: var(--text-muted);
    margin-top: var(--space-1);
}

/* ── ASYMMETRIC DESIGN ELEMENTS ── */

/* Diagonal Dividers */
.section-divider--diagonal {
    position: relative;
    overflow: hidden;
}

.section-divider--diagonal::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(45deg, var(--primary), transparent 70%);
    transform: skewY(-1deg);
    transform-origin: top left;
}

.section-divider--diagonal::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(-45deg, transparent 30%, var(--primary));
    transform: skewY(1deg);
    transform-origin: bottom right;
}

/* Offset Grid System */
.grid--offset {
    display: grid;
    gap: var(--space-8);
}

.grid--offset-2 {
    grid-template-columns: 1fr 1fr;
}

.grid--offset-2 > :nth-child(even) {
    transform: translateY(var(--space-16));
}

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

.grid--offset-3 > :nth-child(2) {
    transform: translateY(var(--space-12));
}

.grid--offset-3 > :nth-child(3) {
    transform: translateY(var(--space-24));
}

/* Asymmetric Cards */
.card--asymmetric {
    position: relative;
}

.card--asymmetric::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 60%;
    height: 4px;
    background: linear-gradient(90deg, transparent, var(--primary));
    border-radius: 0 var(--radius-lg) 0 0;
}

.card--asymmetric::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), transparent);
    border-radius: 0 0 0 var(--radius-lg);
}

/* Visual Accents */
.accent-dot {
    position: relative;
}

.accent-dot::before {
    content: '';
    position: absolute;
    top: var(--space-2);
    right: var(--space-2);
    width: 8px;
    height: 8px;
    background: var(--primary);
    border-radius: var(--radius-full);
    opacity: 0.6;
}

/* ── MODERN CSS FEATURES ── */

/* Container Queries Support */
@supports (container-type: inline-size) {
    .card-container {
        container-type: inline-size;
    }

    @container (max-width: 400px) {
        .card {
            padding: var(--space-4);
        }

        .card__title {
            font-size: var(--text-lg);
        }
    }

    @container (min-width: 600px) {
        .card {
            padding: var(--space-8);
        }

        .card__title {
            font-size: var(--text-2xl);
        }
    }
}

/* CSS Subgrid Support */
@supports (grid-template-rows: subgrid) {
    .grid--subgrid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: var(--space-6);
    }

    .grid--subgrid .card {
        display: grid;
        grid-template-rows: subgrid;
        grid-row: span 3;
    }
}

/* CSS Cascade Layers */
@layer reset, base, components, utilities;

@layer base {
    *, *::before, *::after {
        box-sizing: border-box;
    }

    body {
        font-family: var(--font-body);
        line-height: var(--leading-normal);
        color: var(--text-secondary);
        background: var(--bg);
    }
}

@layer components {
    /* Component styles go here */
}

@layer utilities {
    /* Utility classes */
    .text-center { text-align: center; }
    .text-left { text-align: left; }
    .text-right { text-align: right; }

    .font-display { font-family: var(--font-display); }
    .font-heading { font-family: var(--font-heading); }
    .font-body { font-family: var(--font-body); }

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

    .bg-primary { background-color: var(--primary); }
    .bg-light { background-color: var(--bg-alt); }
    .bg-accent { background-color: var(--primary-light); }

    .shadow-sm { box-shadow: var(--shadow-sm); }
    .shadow-md { box-shadow: var(--shadow-md); }
    .shadow-lg { box-shadow: var(--shadow-lg); }

    .rounded { border-radius: var(--radius-md); }
    .rounded-lg { border-radius: var(--radius-lg); }
    .rounded-full { border-radius: var(--radius-full); }
}

/* ── ANIMATIONS & INTERACTIONS ── */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

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

@keyframes shimmer {
    0% {
        background-position: -200px 0;
    }
    100% {
        background-position: calc(200px + 100%) 0;
    }
}

/* Animation Classes */
.animate-fade-in-up {
    animation: fadeInUp var(--duration-700) var(--ease-out);
}

.animate-slide-in-right {
    animation: slideInRight var(--duration-500) var(--ease-out);
}

.animate-scale-in {
    animation: scaleIn var(--duration-300) var(--ease-out);
}

.animate-pulse {
    animation: pulse var(--duration-1000) var(--ease-in-out) infinite;
}

/* Intersection Observer Animations */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity var(--duration-700) var(--ease-out),
                transform var(--duration-700) var(--ease-out);
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

.reveal--slide-right {
    transform: translateX(-40px);
}

.reveal--slide-right.visible {
    transform: translateX(0);
}

.reveal--scale {
    transform: scale(0.9);
}

.reveal--scale.visible {
    transform: scale(1);
}

/* Stagger Animations */
.stagger-children > * {
    animation-delay: calc(var(--stagger-delay, 100ms) * var(--index, 1));
}

/* ── RESPONSIVE DESIGN ── */

/* Breakpoints */
:root {
    --bp-sm: 640px;
    --bp-md: 768px;
    --bp-lg: 1024px;
    --bp-xl: 1280px;
    --bp-2xl: 1536px;
}

@media (max-width: 640px) {
    .grid--offset-2,
    .grid--offset-3 {
        grid-template-columns: 1fr;
    }

    .grid--offset-2 > :nth-child(even),
    .grid--offset-3 > :nth-child(n) {
        transform: none;
    }

    .card {
        padding: var(--space-4);
    }

    .btn {
        padding: var(--space-3) var(--space-5);
        font-size: var(--text-xs);
    }
}

@media (max-width: 768px) {
    .section-divider--diagonal::before,
    .section-divider--diagonal::after {
        display: none;
    }
}

/* High DPI Displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .btn,
    .card {
        backface-visibility: hidden;
        transform: translateZ(0);
    }
}

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

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --border-light: var(--border-strong);
        --text-muted: var(--text-secondary);
    }
}

/* Print Styles */
@media print {
    .btn,
    .card {
        box-shadow: none !important;
        border: 1px solid var(--text-muted) !important;
    }

    .animate-fade-in-up,
    .animate-slide-in-right,
    .animate-scale-in {
        animation: none !important;
    }
}