:root {
    /* VIP SITE / Apple-like Premium Dark Palette */
    --clr-bg-dark: #0B0F19;
    /* Deep Slate/Black */
    --clr-bg-glass: rgba(15, 23, 42, 0.6);
    /* Slate glass */
    --clr-border-glass: rgba(255, 255, 255, 0.08);
    /* Very fine white stroke */

    --clr-text-main: #F8FAFC;
    /* Crisp White */
    --clr-text-muted: #94A3B8;
    /* Slate Gray */

    /* Primary Gold Accent (#D4AF37) */
    --clr-accent-1: #D4AF37;
    --clr-accent-2: #F0D57A;
    --clr-accent-glow: rgba(212, 175, 55, 0.25);

    --clr-error: #EF4444;
    --clr-warning: #F59E0B;
    --clr-success: #10B981;

    /* Typography */
    /* Using Inter or system fonts for Apple feel */
    --font-primary: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Inter", sans-serif;

    /* Border Radius & Spacing */
    --radius-sm: 12px;
    --radius-md: 20px;
    --radius-lg: 32px;
    --spacing-container: clamp(1.5rem, 5vw, 2.5rem);

    /* Animations */
    --ease-out-expo: cubic-bezier(0.19, 1, 0.22, 1);
    --transition-fast: 0.2s ease;
    --transition-base: 0.4s var(--ease-out-expo);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body.dark-theme {
    background-color: var(--clr-bg-dark);
    color: var(--clr-text-main);
    font-family: var(--font-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    /* Soft glowing orbs in background (Apple style) */
    background-image:
        radial-gradient(ellipse at top left, rgba(212, 175, 55, 0.05) 0%, transparent 40%),
        radial-gradient(circle at bottom right, rgba(15, 23, 42, 0.8) 0%, transparent 50%);
    background-attachment: fixed;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-container);
}

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

h1,
h2,
h3,
h4 {
    letter-spacing: -0.03em;
    font-weight: 700;
}

/* Premium Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-base);
    border: 1px solid transparent;
    outline: none;
    letter-spacing: 0.5px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--clr-accent-1) 0%, #b89326 100%);
    color: #0b0f19;
    /* Dark text on gold */
    box-shadow: 0 8px 24px var(--clr-accent-glow);
}

.btn-primary:not(:disabled):hover {
    transform: scale(1.02);
    box-shadow: 0 12px 32px rgba(212, 175, 55, 0.4);
    filter: brightness(1.1);
}

.btn-primary:active {
    transform: scale(0.98);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* Sticky App-like Header */
.header {
    position: sticky;
    top: 1.5rem;
    z-index: 100;
    padding: 0 1.5rem;
    margin: 0 auto;
    max-width: 900px;
    width: 100%;
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1.25rem 0.75rem 1.5rem;
    /* slightly less padding on right for the button */
    border-radius: 9999px;
    background: rgba(15, 23, 42, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
    overflow: hidden;
    gap: 1rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    font-weight: 800;
    font-size: 1.2rem;
    letter-spacing: -0.5px;
    flex-shrink: 0;
}

.logo-vip {
    color: var(--clr-accent-1);
    /* Solid Gold */
}

.nav {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-grow: 1;
    /* allow nav to take center space */
    margin: 0 1rem;
}

.nav-link {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--clr-text-muted);
    white-space: nowrap;
}

.header-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
    flex-shrink: 0;
}

.nav-link:hover {
    color: var(--clr-text-main);
}

.header .btn {
    padding: 0.6rem 1.25rem;
    font-size: 0.9rem;
    border-radius: 999px;
    background: transparent;
    border: 1px solid var(--clr-accent-1);
    color: var(--clr-accent-1);
    box-shadow: none;
}

.header .btn:hover {
    background: var(--clr-accent-1);
    color: #000;
}

main {
    flex: 1;
}

.footer {
    padding: 3rem 0;
    text-align: center;
    color: var(--clr-text-muted);
    font-size: 0.9rem;
    margin-top: 6rem;
    border-top: 1px solid var(--clr-border-glass);
}

/* Apple-style floating background orbs */
.ambient-lights {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
}

.ambient-orb {
    position: absolute;
    width: 60vw;
    height: 60vh;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.4;
    animation: drift 20s infinite alternate cubic-bezier(0.5, 0, 0.5, 1);
}

.orb-1 {
    background: radial-gradient(circle, rgba(212, 175, 55, 0.15) 0%, transparent 70%);
    top: -20%;
    left: -10%;
}

.orb-2 {
    background: radial-gradient(circle, rgba(59, 130, 246, 0.08) 0%, transparent 70%);
    /* Deep blue tint for contrast */
    bottom: -20%;
    right: -10%;
    animation-delay: -10s;
}

@keyframes drift {
    0% {
        transform: translate(0px, 0px) scale(1);
    }

    50% {
        transform: translate(5%, 5%) scale(1.05);
    }

    100% {
        transform: translate(-5%, 8%) scale(0.95);
    }
}

/* Header & Mobile Menu Responsive Styles */
.desktop-only {
    display: inline-flex;
}

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

.icon-btn {
    background: transparent;
    border: none;
    color: var(--clr-text-main);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

@media (max-width: 768px) {
    .desktop-only {
        display: none !important;
    }

    .mobile-only {
        display: flex !important;
    }

    .header-inner {
        padding: 0.6rem 1rem;
    }

    /* Fixed mobile offcanvas panel */
    .mobile-nav-wrapper {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        height: 100dvh;
        /* iOS safe space */
        background: rgba(8, 11, 18, 0.98);
        -webkit-backdrop-filter: blur(40px);
        backdrop-filter: blur(40px);
        display: flex;
        flex-direction: column;
        transform: translate3d(100%, 0, 0);
        transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
        z-index: 1000;
        overscroll-behavior: contain;
    }

    .mobile-nav-wrapper.nav-open {
        transform: translate3d(0, 0, 0);
    }

    .nav-mobile-header {
        padding: 1.5rem 2rem;
        display: flex;
        justify-content: space-between;
        align-items: center;
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        flex-shrink: 0;
    }

    .mobile-nav-links {
        display: flex;
        flex-direction: column;
        padding: 3rem 2rem;
        gap: 2rem;
        flex-grow: 1;
        overflow-y: auto;
    }

    .mobile-nav-link {
        font-size: 2rem;
        font-weight: 700;
        color: var(--clr-text-main);
        letter-spacing: -0.03em;
        text-align: left;
    }

    .mobile-nav-footer {
        padding: 2rem;
        border-top: 1px solid rgba(255, 255, 255, 0.05);
        flex-shrink: 0;
    }
}

/* ------------------- */
/* Theme Toggle Button */
/* ------------------- */
body.light-theme {
    --clr-bg-dark: #F5F5F7;
    /* Apple gray */
    --clr-bg-glass: rgba(255, 255, 255, 0.85);
    --clr-border-glass: rgba(0, 0, 0, 0.08);
    --clr-text-main: #1D1D1F;
    /* Apple deep dark gray */
    --clr-text-muted: #86868B;
    /* Apple secondary gray */
}

body.light-theme .header-inner,
body.light-theme .mobile-nav-wrapper {
    background: rgba(255, 255, 255, 0.95);
    border-color: rgba(0, 0, 0, 0.1);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

body.light-theme .metric-box {
    background: #FFFFFF;
    border-color: rgba(0, 0, 0, 0.05);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.03);
}

body.light-theme .ambient-orb {
    opacity: 0.6;
}

.theme-toggle {
    position: fixed;
    bottom: 2rem;
    left: 2rem;
    z-index: 1000;
    width: 3.5rem;
    height: 3.5rem;
    border-radius: 50%;
    background: var(--clr-bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--clr-border-glass);
    color: var(--clr-text-main);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    transition: all var(--transition-base);
}

body.light-theme .theme-toggle {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.theme-toggle:hover {
    transform: scale(1.1);
}

.theme-toggle svg {
    width: 24px;
    height: 24px;
    transition: var(--transition-base);
}

/* ------------------- */
/* Floating Multi-Contact Widget */
/* ------------------- */
.contact-widget-wrapper {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    z-index: 1000;
    will-change: transform;
    /* Non-Obvious Opt #1: GPU layer */
}

.cw-items {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
    opacity: 0;
    visibility: hidden;
    transform: translateY(15px);
    transition: all 0.3s cubic-bezier(0.19, 1, 0.22, 1);
    align-items: center;
}

.contact-widget-wrapper:hover .cw-items,
.contact-widget-wrapper.active .cw-items {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.cw-icon {
    width: 2.8rem;
    height: 2.8rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    text-decoration: none;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    position: relative;
}

/* Obvious Opt #2: Tooltips */
.cw-icon::after {
    content: attr(aria-label);
    position: absolute;
    right: 3.5rem;
    background: rgba(15, 23, 42, 0.9);
    padding: 0.4rem 0.8rem;
    border-radius: 8px;
    font-size: 0.75rem;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transform: translateX(10px);
    transition: all 0.3s var(--ease-out-expo);
    pointer-events: none;
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--clr-text-main);
}

.cw-icon:hover::after {
    opacity: 1;
    visibility: visible;
    transform: translateX(0);
}

.cw-icon:hover {
    transform: scale(1.1);
}

.cw-phone {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
}

.cw-wa {
    background: linear-gradient(135deg, #25D366 0%, #128C7E 100%);
}

.cw-main {
    width: 3.5rem;
    height: 3.5rem;
    border-radius: 50%;
    /* Obvious Opt #3: Refined Brand Gradient */
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 8px 24px rgba(16, 185, 129, 0.3);
    cursor: pointer;
    text-decoration: none;
    transition: all 0.4s var(--ease-out-expo);
    position: relative;
}

/* New subtle ripple effect */
.cw-main.pulse::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 50%;
    background: inherit;
    z-index: -1;
    animation: cwRipple 2s infinite;
}

@keyframes cwRipple {
    0% {
        transform: scale(1);
        opacity: 0.5;
    }

    100% {
        transform: scale(1.8);
        opacity: 0;
    }
}

.contact-widget-wrapper:hover .cw-main,
.contact-widget-wrapper.active .cw-main {
    animation: none;
    transform: scale(1.05);
}

.cw-main svg {
    transition: transform 0.3s;
}

.contact-widget-wrapper.active .cw-icon-call {
    display: none !important;
}

.contact-widget-wrapper.active .cw-icon-close {
    display: block !important;
}

.cw-main svg {
    width: 24px;
    height: 24px;
}


.cw-tg {
    background: linear-gradient(135deg, #0088cc 0%, #00aaff 100%);
}

.cw-email {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
}

@media (max-width: 600px) {
    .contact-widget-wrapper {
        bottom: 1.5rem;
        right: 1.5rem;
    }

    .theme-toggle {
        bottom: 1.5rem;
        left: 1.5rem;
    }
}

/* ══════════════════════════════════════════════════════════
   PAGESPEED CRITICAL OPTIMIZATIONS — добавлено 2026-02
   Цель: LCP < 2.5s, CLS=0, FID < 100ms
══════════════════════════════════════════════════════════ */

/* 1. Явные размеры картинок в портфолио — устраняем CLS (Cumulative Layout Shift) */
.portfolio-img-wrap {
    aspect-ratio: 16 / 10;
    height: auto;
    /* Overrides fixed 200px — browser reserves exact space */
}

/* 2. Убираем дорогие transform-анимации при прокрутке на мобильных (FID + TBT) */
@media (max-width: 768px) {
    .portfolio-card:hover {
        transform: none !important;
    }

    .service-item:hover {
        transform: none !important;
    }

    .testimonial-card:hover {
        transform: none !important;
    }

    .transform-stage:hover {
        transform: none !important;
    }
}

/* 3. will-change только для критических анимированных элементов (экономим GPU память) */
.portfolio-img {
    will-change: transform;
}

.qm-window {
    will-change: transform, opacity;
}

/* 4. Блокируем рендеринг несущественных секций пока они вне экрана */
#blog,
#reviews,
.section-transformation,
.section-history {
    content-visibility: auto;
    contain-intrinsic-size: 0 600px;
}

/* 5. font-display: swap подключает системный шрифт первым, Inter догоняет */
/* Это решается Google Fonts &display=swap в URL — уже добавлено */

/* 6. Prevent FOIT - не показывать пустые блоки пока шрифт не загрузился */
body {
    font-display: optional;
}

/* ── ACCESSIBILITY FIXES (WCAG 2.1 AA compliance) ────────── */
/* Screen reader only utility — hidden visually but accessible */
.sr-only {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}

/* Text contrast boost — WCAG AA requires 4.5:1 ratio */
:root {
    --clr-text-muted: rgba(255, 255, 255, 0.68);
    /* was 0.5 */
}

/* Focus visible improvements for keyboard navigation */
*:focus-visible {
    outline: 2px solid #D4AF37;
    outline-offset: 3px;
}

/* Improve tap target sizes (48px min recommended) */
@media (max-width: 768px) {

    .btn,
    button {
        min-height: 48px;
    }

    .nav-link {
        padding: 0.75rem 1rem !important;
    }
}