/**
 * ПУТЬ: style/css/main.css
 * Основные стили: переменные, reset, типографика, layout, кнопки, утилиты
 */

/* ═══ CSS VARIABLES ═══ */
:root {
    --bg-primary: #000000;
    --bg-secondary: #0a0a0a;
    --bg-tertiary: #111111;
    --bg-elevated: #1a1a1a;
    --bg-card: #0f0f0f;
    --bg-hover: #1a1a1a;

    --accent-primary: #00ff88;
    --accent-secondary: #00ccff;
    --accent-gradient: linear-gradient(135deg, #00ff88 0%, #00ccff 100%);
    --accent-glow: rgba(0, 255, 136, 0.3);

    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --text-tertiary: #6a6a6a;
    --text-muted: #4a4a4a;

    --border-primary: #222222;
    --border-secondary: #1a1a1a;
    --border-accent: #00ff88;
    --border-glow: rgba(0, 255, 136, 0.2);

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.6);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.7);
    --shadow-glow: 0 0 30px var(--accent-glow);

    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-display: 'Space Grotesk', 'Inter', sans-serif;

    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);

    --z-particles: 1;
    --z-content: 10;
    --z-header: 100;
    --z-modal: 1000;
    --z-cursor: 9999;
}

/* ═══ RESET ═══ */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-primary);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    overflow-x: hidden;
    position: relative;
}

/* ═══ SCROLLBAR ═══ */
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--bg-secondary); }
::-webkit-scrollbar-thumb { background: var(--bg-elevated); border-radius: var(--radius-full); border: 2px solid var(--bg-secondary); }
::-webkit-scrollbar-thumb:hover { background: var(--accent-primary); }

::selection { background: var(--accent-primary); color: var(--bg-primary); }

/* ═══ TYPOGRAPHY ═══ */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

h1 { font-size: clamp(2.5rem, 5vw, 4.5rem); letter-spacing: -0.02em; }
h2 { font-size: clamp(2rem, 4vw, 3.5rem); letter-spacing: -0.01em; }
h3 { font-size: clamp(1.5rem, 3vw, 2.5rem); }
h4 { font-size: clamp(1.25rem, 2.5vw, 2rem); }

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

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

a:hover { color: var(--accent-secondary); }

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

/* ═══ LAYOUT ═══ */
.page-wrapper {
    position: relative;
    z-index: var(--z-content);
    min-height: 100vh;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
}

/* ═══ PARTICLES ═══ */
#particles-js {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: var(--z-particles);
    background: linear-gradient(180deg, #000000 0%, #0a0a0a 100%);
}

#particles-js::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 500px;
    background: radial-gradient(ellipse at top, rgba(0, 255, 136, 0.1) 0%, transparent 70%);
    pointer-events: none;
}

/* ═══ CUSTOM CURSOR ═══ */
.custom-cursor,
.cursor-follower {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    position: fixed;
    pointer-events: none;
    z-index: var(--z-cursor);
    transition: transform var(--transition-fast), opacity var(--transition-fast);
    opacity: 0;
}

.custom-cursor {
    background: var(--accent-primary);
    box-shadow: 0 0 20px var(--accent-glow);
    transform: translate(-50%, -50%);
    mix-blend-mode: difference;
}

.cursor-follower {
    width: 40px;
    height: 40px;
    border: 2px solid var(--accent-primary);
    background: transparent;
    transform: translate(-50%, -50%);
    transition: transform 0.2s cubic-bezier(0.75, -0.5, 0, 1.75), opacity var(--transition-fast);
}

body:hover .custom-cursor,
body:hover .cursor-follower {
    opacity: 1;
}

/* ═══ BUTTONS ═══ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
    z-index: 1;
    line-height: 1.4;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    transform: translate(-50%, -50%);
    transition: width var(--transition-slow), height var(--transition-slow);
    z-index: -1;
}

.btn:hover::before {
    width: 300%;
    height: 300%;
}

/* Button sizes */
.btn-sm {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 0.875rem;
}

.btn-lg {
    padding: var(--spacing-lg) var(--spacing-2xl);
    font-size: 1.1rem;
}

/* Button variants */
.btn-primary {
    background: var(--accent-gradient);
    color: var(--bg-primary);
    box-shadow: 0 4px 16px var(--accent-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px var(--accent-glow);
    color: var(--bg-primary);
}

.btn-secondary {
    background: transparent;
    color: var(--accent-primary);
    border: 2px solid var(--accent-primary);
}

.btn-secondary:hover {
    background: var(--accent-primary);
    color: var(--bg-primary);
}

.btn-ghost {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--border-primary);
}

.btn-ghost:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

/* ═══ SCROLL TO TOP ═══ */
.scroll-to-top {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    width: 50px;
    height: 50px;
    background: var(--bg-elevated);
    border: 2px solid var(--border-primary);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-base);
    z-index: 50;
    color: var(--text-primary);
}

.scroll-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.scroll-to-top:hover {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    transform: translateY(-5px);
    box-shadow: var(--shadow-glow);
    color: var(--bg-primary);
}

/* ═══ LOADING OVERLAY ═══ */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    transition: opacity var(--transition-slow), visibility var(--transition-slow);
}

.loading-overlay.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.loading-spinner {
    position: relative;
    width: 80px;
    height: 80px;
}

.spinner-ring {
    position: absolute;
    width: 100%;
    height: 100%;
    border: 3px solid transparent;
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.spinner-ring:nth-child(2) {
    width: 60%;
    height: 60%;
    top: 20%;
    left: 20%;
    border-top-color: var(--accent-secondary);
    animation-duration: 1.5s;
    animation-direction: reverse;
}

.spinner-ring:nth-child(3) {
    width: 30%;
    height: 30%;
    top: 35%;
    left: 35%;
    border-top-color: var(--accent-primary);
    animation-duration: 2s;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* ═══ UTILITY CLASSES ═══ */
.gradient-text {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.glow-text {
    text-shadow: 0 0 20px var(--accent-glow);
}

.glass-effect {
    background: rgba(15, 15, 15, 0.6);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-primary);
}

/* Show/hide helpers */
.desktop-only { display: flex; }
.mobile-only { display: none !important; }

/* ═══ RESPONSIVE ═══ */
@media (max-width: 768px) {
    html { font-size: 14px; }
    .container { padding: 0 var(--spacing-md); }

    .custom-cursor,
    .cursor-follower { display: none !important; }

    .desktop-only { display: none !important; }
    .mobile-only { display: flex !important; }
}

@media (max-width: 480px) {
    html { font-size: 13px; }
}