/* ============================================
   Biz Online Pro — Windows Fluent Design
   Primary: #0078D4 | Background: #F3F3F3
   Font: Segoe UI system stack
   ============================================ */

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

:root {
    --accent: #0078D4;
    --accent-hover: #106EBE;
    --accent-light: #E8F4FD;
    --accent-subtle: #CCE4F7;
    --bg: #F3F3F3;
    --surface: #FFFFFF;
    --surface-hover: #F9F9F9;
    --text: #1A1A1A;
    --text-secondary: #5D5D5D;
    --text-muted: #8A8A8A;
    --border: #E0E0E0;
    --border-light: #EBEBEB;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.1);
    --shadow-xl: 0 16px 48px rgba(0,0,0,0.12);
    --radius: 6px;
    --radius-lg: 8px;
    --transition: 0.2s ease;
    --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

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

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

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

/* === LAYOUT === */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 56px;
}

.section-badge {
    display: inline-block;
    background: var(--accent-light);
    color: var(--accent);
    font-size: 13px;
    font-weight: 600;
    padding: 6px 16px;
    border-radius: 4px;
    margin-bottom: 16px;
    letter-spacing: 0.02em;
    text-transform: uppercase;
}

.section-title {
    font-size: 36px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 16px;
    color: var(--text);
}

.section-desc {
    font-size: 17px;
    color: var(--text-secondary);
    max-width: 640px;
    margin: 0 auto;
    line-height: 1.7;
}

/* === FLUENT CARD (reveal highlight) === */
.fluent-card {
    background: var(--surface);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: 32px;
    position: relative;
    overflow: hidden;
    transition: box-shadow var(--transition), border-color var(--transition), transform var(--transition);
}

.fluent-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(600px circle at var(--mouse-x, 50%) var(--mouse-y, 50%), rgba(0,120,212,0.06), transparent 40%);
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
    z-index: 0;
}

.fluent-card:hover::before {
    opacity: 1;
}

.fluent-card:hover {
    box-shadow: var(--shadow-md);
    border-color: rgba(0,120,212,0.2);
    transform: translateY(-2px);
}

.fluent-card > * {
    position: relative;
    z-index: 1;
}

/* === NAVIGATION (Acrylic) === */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(243,243,243,0.72);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--border-light);
    height: 56px;
    display: flex;
    align-items: center;
}

.nav .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

.nav-logo {
    font-size: 18px;
    font-weight: 700;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-logo-icon {
    width: 28px;
    height: 28px;
    background: var(--accent);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav-logo-icon svg {
    width: 16px;
    height: 16px;
    fill: white;
}

.nav-links {
    display: flex;
    gap: 32px;
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    transition: color var(--transition);
    position: relative;
    padding: 4px 0;
}

.nav-links a:hover {
    color: var(--accent);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width 0.25s ease;
    border-radius: 1px;
}

.nav-links a:hover::after {
    width: 100%;
}

.nav-cta {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--accent);
    color: #fff !important;
    font-size: 13px;
    font-weight: 600;
    padding: 8px 20px;
    border-radius: 4px;
    border: none;
    cursor: pointer;
    transition: background var(--transition), box-shadow var(--transition);
}

.nav-cta:hover {
    background: var(--accent-hover);
    color: #fff !important;
    box-shadow: 0 2px 8px rgba(0,120,212,0.3);
}

/* Burger */
.burger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.burger span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text);
    border-radius: 1px;
    transition: transform 0.25s ease, opacity 0.25s ease;
}

.burger.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.burger.active span:nth-child(2) {
    opacity: 0;
}

.burger.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* === HERO === */
.hero {
    padding: 140px 0 80px;
    text-align: center;
    background: linear-gradient(180deg, #FFFFFF 0%, var(--bg) 100%);
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: 60px;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0,120,212,0.05) 0%, transparent 70%);
    pointer-events: none;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 8px 18px;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 28px;
    box-shadow: var(--shadow-sm);
}

.hero-badge-dot {
    width: 8px;
    height: 8px;
    background: #16A34A;
    border-radius: 50%;
    animation: pulse-dot 2s ease infinite;
}

@keyframes pulse-dot {
    0%, 100% { box-shadow: 0 0 0 0 rgba(22,163,74,0.4); }
    50% { box-shadow: 0 0 0 6px rgba(22,163,74,0); }
}

.hero-title {
    font-size: 52px;
    font-weight: 700;
    line-height: 1.15;
    margin-bottom: 24px;
    color: var(--text);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.hero-title em {
    font-style: normal;
    color: var(--accent);
}

.hero-desc {
    font-size: 18px;
    color: var(--text-secondary);
    line-height: 1.75;
    max-width: 640px;
    margin: 0 auto 36px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 40px;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: var(--accent);
    color: #fff;
    font-family: var(--font);
    font-size: 15px;
    font-weight: 600;
    padding: 14px 32px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background var(--transition), box-shadow var(--transition), transform var(--transition);
}

.btn-primary:hover {
    background: var(--accent-hover);
    color: #fff;
    box-shadow: 0 4px 16px rgba(0,120,212,0.3);
    transform: translateY(-1px);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: var(--surface);
    color: var(--text);
    font-family: var(--font);
    font-size: 15px;
    font-weight: 600;
    padding: 14px 32px;
    border: 1px solid var(--border);
    border-radius: 4px;
    cursor: pointer;
    transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.btn-secondary:hover {
    background: var(--surface-hover);
    border-color: var(--accent);
    box-shadow: var(--shadow-sm);
}

.hero-trust {
    display: flex;
    gap: 32px;
    justify-content: center;
    flex-wrap: wrap;
    font-size: 14px;
    color: var(--text-muted);
}

.hero-trust span {
    display: flex;
    align-items: center;
    gap: 8px;
}

.hero-trust svg {
    width: 16px;
    height: 16px;
    fill: var(--accent);
    flex-shrink: 0;
}

/* === SERVICES === */
.services {
    background: var(--surface);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.service-card {
    padding: 36px;
}

.service-icon {
    width: 48px;
    height: 48px;
    background: var(--accent-light);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.service-icon svg {
    width: 24px;
    height: 24px;
    stroke: var(--accent);
    fill: none;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.service-card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text);
}

.service-card p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 18px;
}

.service-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.service-tags span {
    background: var(--bg);
    color: var(--text-secondary);
    font-size: 12px;
    font-weight: 600;
    padding: 5px 12px;
    border-radius: 4px;
    border: 1px solid var(--border-light);
}

/* === STATS === */
.stats {
    background: var(--accent);
    position: relative;
    overflow: hidden;
}

.stats::before {
    content: '';
    position: absolute;
    top: -40%;
    right: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(255,255,255,0.08) 0%, transparent 60%);
    pointer-events: none;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
    position: relative;
    z-index: 1;
}

.stat-item {
    text-align: center;
    color: #fff;
}

.stat-value {
    font-size: 48px;
    font-weight: 700;
    line-height: 1;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 15px;
    font-weight: 500;
    opacity: 0.85;
    line-height: 1.4;
}

/* === PROCESS === */
.process-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    position: relative;
}

.process-grid::before {
    content: '';
    position: absolute;
    top: 40px;
    left: 12.5%;
    right: 12.5%;
    height: 2px;
    background: var(--border);
    z-index: 0;
}

.process-step {
    text-align: center;
    position: relative;
    z-index: 1;
    padding: 0 8px;
}

.process-num {
    width: 52px;
    height: 52px;
    background: var(--accent);
    color: #fff;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 700;
    margin: 0 auto 20px;
    box-shadow: 0 4px 12px rgba(0,120,212,0.25);
}

.process-step h3 {
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text);
}

.process-step p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
}

.process-time {
    display: inline-block;
    margin-top: 14px;
    font-size: 12px;
    font-weight: 600;
    color: var(--accent);
    background: var(--accent-light);
    padding: 4px 12px;
    border-radius: 4px;
}

/* === WHY US === */
.whyus {
    background: var(--surface);
}

.whyus-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.whyus-item {
    padding: 24px;
}

.whyus-icon {
    width: 40px;
    height: 40px;
    background: var(--accent-light);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 14px;
}

.whyus-icon svg {
    width: 20px;
    height: 20px;
    stroke: var(--accent);
    fill: none;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.whyus-item h4 {
    font-size: 15px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text);
}

.whyus-item p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* === CASES === */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.case-card {
    padding: 0;
    overflow: hidden;
}

.case-header {
    background: linear-gradient(135deg, var(--accent) 0%, #005A9E 100%);
    padding: 28px 28px 24px;
    color: #fff;
}

.case-client {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    opacity: 0.8;
    margin-bottom: 8px;
}

.case-header h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 4px;
}

.case-header .case-location {
    font-size: 13px;
    opacity: 0.75;
}

.case-body {
    padding: 28px;
}

.case-section {
    margin-bottom: 18px;
}

.case-section:last-child {
    margin-bottom: 0;
}

.case-section-title {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.case-section p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.65;
}

.case-metrics {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    padding-top: 18px;
    border-top: 1px solid var(--border-light);
}

.case-metric {
    text-align: center;
}

.case-metric-value {
    font-size: 22px;
    font-weight: 700;
    color: var(--accent);
    line-height: 1;
    margin-bottom: 4px;
}

.case-metric-label {
    font-size: 11px;
    color: var(--text-muted);
    font-weight: 500;
}

/* === BONUSES === */
.bonuses {
    background: var(--surface);
}

.bonuses-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.bonus-card {
    padding: 28px;
    text-align: center;
}

.bonus-icon {
    width: 48px;
    height: 48px;
    background: var(--accent-light);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
}

.bonus-icon svg {
    width: 22px;
    height: 22px;
    stroke: var(--accent);
    fill: none;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.bonus-card h4 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text);
}

.bonus-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* === FAQ === */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.faq-item {
    background: var(--surface);
    border: 1px solid var(--border-light);
    border-radius: var(--radius);
    overflow: hidden;
    transition: border-color var(--transition);
}

.faq-item[open] {
    border-color: rgba(0,120,212,0.25);
}

.faq-item summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    font-size: 15px;
    font-weight: 600;
    color: var(--text);
    cursor: pointer;
    list-style: none;
    transition: background var(--transition);
    user-select: none;
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::marker {
    display: none;
    content: '';
}

.faq-item summary:hover {
    background: var(--surface-hover);
}

.faq-chevron {
    width: 20px;
    height: 20px;
    stroke: var(--text-muted);
    fill: none;
    stroke-width: 2;
    transition: transform 0.25s ease;
    flex-shrink: 0;
    margin-left: 16px;
}

.faq-item[open] .faq-chevron {
    transform: rotate(180deg);
}

.faq-answer {
    padding: 0 24px 20px;
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.75;
}

/* === CTA === */
.cta {
    background: linear-gradient(135deg, var(--accent) 0%, #005A9E 100%);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta::before {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(255,255,255,0.06) 0%, transparent 60%);
    pointer-events: none;
}

.cta-content {
    position: relative;
    z-index: 1;
}

.cta h2 {
    font-size: 36px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 16px;
}

.cta p {
    font-size: 17px;
    color: rgba(255,255,255,0.85);
    max-width: 560px;
    margin: 0 auto 36px;
    line-height: 1.7;
}

.cta .btn-white {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: #fff;
    color: var(--accent);
    font-family: var(--font);
    font-size: 15px;
    font-weight: 600;
    padding: 14px 36px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: box-shadow var(--transition), transform var(--transition);
}

.cta .btn-white:hover {
    box-shadow: 0 6px 20px rgba(0,0,0,0.15);
    transform: translateY(-2px);
}

/* === FOOTER === */
.footer {
    background: #1A1A1A;
    color: rgba(255,255,255,0.7);
    padding: 60px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 40px;
}

.footer-brand h3 {
    font-size: 20px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 14px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.footer-brand-icon {
    width: 24px;
    height: 24px;
    background: var(--accent);
    border-radius: 4px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.footer-brand-icon svg {
    width: 14px;
    height: 14px;
    fill: #fff;
}

.footer-brand p {
    font-size: 14px;
    line-height: 1.7;
    margin-bottom: 20px;
}

.footer-contacts a {
    display: flex;
    align-items: center;
    gap: 8px;
    color: rgba(255,255,255,0.7);
    font-size: 14px;
    margin-bottom: 8px;
    transition: color var(--transition);
}

.footer-contacts a:hover {
    color: var(--accent);
}

.footer-contacts svg {
    width: 16px;
    height: 16px;
    stroke: var(--accent);
    fill: none;
    stroke-width: 2;
    flex-shrink: 0;
}

.footer-col h4 {
    font-size: 14px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 18px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.footer-col ul {
    list-style: none;
}

.footer-col ul li {
    margin-bottom: 10px;
}

.footer-col ul a {
    color: rgba(255,255,255,0.6);
    font-size: 14px;
    transition: color var(--transition);
}

.footer-col ul a:hover {
    color: #fff;
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.08);
    padding: 20px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    color: rgba(255,255,255,0.4);
}

.footer-bottom a {
    color: rgba(255,255,255,0.4);
}

.footer-bottom a:hover {
    color: rgba(255,255,255,0.7);
}

/* === MOBILE MENU === */
.mobile-menu {
    display: none;
    position: fixed;
    top: 56px;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(243,243,243,0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 999;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 24px;
}

.mobile-menu.active {
    display: flex;
}

.mobile-menu a {
    font-size: 20px;
    font-weight: 600;
    color: var(--text);
    transition: color var(--transition);
}

.mobile-menu a:hover {
    color: var(--accent);
}

/* === RESPONSIVE === */

/* 1024px */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 42px;
    }

    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 32px;
    }

    .stat-value {
        font-size: 40px;
    }

    .process-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 32px;
    }

    .process-grid::before {
        display: none;
    }

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

    .cases-grid {
        grid-template-columns: 1fr;
        max-width: 600px;
        margin-left: auto;
        margin-right: auto;
    }

    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* 768px */
@media (max-width: 768px) {
    .section {
        padding: 60px 0;
    }

    .section-title {
        font-size: 28px;
    }

    .nav-links {
        display: none;
    }

    .nav-cta-desktop {
        display: none;
    }

    .burger {
        display: flex;
    }

    .hero {
        padding: 120px 0 60px;
    }

    .hero-title {
        font-size: 34px;
    }

    .hero-desc {
        font-size: 16px;
    }

    .services-grid {
        grid-template-columns: 1fr;
    }

    .whyus-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .bonuses-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .cta h2 {
        font-size: 28px;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }
}

/* 480px */
@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .section {
        padding: 48px 0;
    }

    .section-title {
        font-size: 24px;
    }

    .section-desc {
        font-size: 15px;
    }

    .hero {
        padding: 100px 0 48px;
    }

    .hero-title {
        font-size: 28px;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn-primary, .btn-secondary {
        width: 100%;
        justify-content: center;
    }

    .hero-trust {
        flex-direction: column;
        gap: 12px;
        align-items: center;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }

    .stat-value {
        font-size: 32px;
    }

    .process-grid {
        grid-template-columns: 1fr;
    }

    .whyus-grid {
        grid-template-columns: 1fr;
    }

    .bonuses-grid {
        grid-template-columns: 1fr;
    }

    .case-metrics {
        grid-template-columns: 1fr;
        gap: 16px;
    }
}