/* ============================================================
   成都无盘网络科技有限公司官网 - 样式表
   设计主题：深空电竞 · 商务科技风
   ============================================================ */

/* ==================== CSS Variables ==================== */
:root {
    --bg-primary: #07090f;
    --bg-secondary: #0d1117;
    --bg-card: #111827;
    --bg-card-hover: #1a2438;

    --accent-blue: #00a8ff;
    --accent-blue-dim: rgba(0, 168, 255, 0.12);
    --accent-blue-glow: rgba(0, 168, 255, 0.35);
    --accent-cyan: #00d4ff;
    --accent-purple: #6c3bff;

    --text-primary: #f0f4ff;
    --text-secondary: #8892a4;
    --text-muted: #4a5568;

    --border: rgba(0, 168, 255, 0.12);
    --border-hover: rgba(0, 168, 255, 0.4);

    --font-heading: 'Rajdhani', 'Orbitron', sans-serif;
    --font-body: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;

    --nav-height: 72px;
    --container-max: 1280px;
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;

    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms ease;
}

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

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

body {
    font-family: var(--font-body);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

ul, ol { list-style: none; }

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

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
    outline: none;
}

input, textarea, select {
    font-family: inherit;
    font-size: inherit;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
}

/* ==================== Utility ==================== */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-tag {
    display: inline-block;
    font-family: var(--font-heading);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 4px;
    color: var(--accent-blue);
    text-transform: uppercase;
    margin-bottom: 16px;
    padding: 6px 16px;
    border: 1px solid var(--border-hover);
    border-radius: 20px;
}

.section-title {
    font-size: clamp(32px, 5vw, 48px);
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 16px;
    letter-spacing: 1px;
}

.section-subtitle {
    font-size: 16px;
    color: var(--text-secondary);
    max-width: 560px;
    margin: 0 auto;
}

/* ==================== Buttons ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    font-family: var(--font-heading);
    font-size: 15px;
    font-weight: 600;
    letter-spacing: 1px;
    border-radius: var(--radius-sm);
    transition: all var(--transition-normal);
    cursor: pointer;
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, #00a8ff 0%, #0077cc 100%);
    color: #fff;
    box-shadow: 0 4px 20px rgba(0, 168, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(0, 168, 255, 0.5);
    background: linear-gradient(135deg, #1eb8ff 0%, #0088ee 100%);
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-outline:hover {
    border-color: var(--accent-blue);
    color: var(--accent-blue);
    background: var(--accent-blue-dim);
}

.btn-block {
    width: 100%;
}

/* ==================== Scrollbar ==================== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb {
    background: rgba(0, 168, 255, 0.3);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover { background: rgba(0, 168, 255, 0.5); }

/* ==================== Selection ==================== */
::selection {
    background: rgba(0, 168, 255, 0.3);
    color: #fff;
}

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

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes pulse-glow {
    0%, 100% { opacity: 0.4; transform: scale(1); }
    50% { opacity: 0.7; transform: scale(1.05); }
}

@keyframes scroll-wheel {
    0% { transform: translateY(0); opacity: 1; }
    100% { transform: translateY(8px); opacity: 0; }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

@keyframes scan-line {
    0% { left: -100%; }
    100% { left: 200%; }
}

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

@keyframes spin-slow {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ==================== Navigation ==================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--nav-height);
    transition: background var(--transition-normal), box-shadow var(--transition-normal);
}

.navbar.scrolled {
    background: rgba(7, 9, 15, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 1px 0 var(--border);
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    z-index: 1001;
}

.logo-text {
    font-family: var(--font-heading);
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: 1px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link {
    font-family: var(--font-heading);
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 0.5px;
    color: rgba(240, 244, 255, 0.7);
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    position: relative;
    transition: color var(--transition-fast);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--accent-blue);
    transition: width var(--transition-normal), left var(--transition-normal);
    border-radius: 2px;
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 60%;
    left: 20%;
}

.nav-phone-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 18px;
    font-family: var(--font-heading);
    font-size: 14px;
    font-weight: 600;
    color: #fff;
    background: linear-gradient(135deg, #00a8ff 0%, #0077cc 100%);
    border-radius: var(--radius-sm);
    transition: all var(--transition-normal);
    cursor: pointer;
}

.nav-phone-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 20px rgba(0, 168, 255, 0.4);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    width: 28px;
    padding: 4px;
    z-index: 1001;
    cursor: pointer;
}

.mobile-menu-btn span {
    display: block;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-normal);
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}
.mobile-menu-btn.active span:nth-child(2) { opacity: 0; }
.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ==================== Mobile Navigation ==================== */
.mobile-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 360px;
    height: 100vh;
    background: rgba(13, 17, 23, 0.98);
    backdrop-filter: blur(20px);
    z-index: 999;
    transition: right var(--transition-slow);
    padding: 80px 32px 40px;
    border-left: 1px solid var(--border);
}

.mobile-nav.open { right: 0; }

.mobile-nav-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 40px;
}

.mobile-nav-close {
    color: var(--text-secondary);
    cursor: pointer;
}

.mobile-nav-close:hover { color: var(--text-primary); }

.mobile-nav-links {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-bottom: 32px;
}

.mobile-nav-link {
    font-family: var(--font-heading);
    font-size: 18px;
    font-weight: 600;
    color: var(--text-secondary);
    padding: 14px 0;
    border-bottom: 1px solid var(--border);
    transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
    color: var(--accent-blue);
    padding-left: 8px;
}

.mobile-nav-phone {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 14px 20px;
    font-family: var(--font-heading);
    font-size: 15px;
    font-weight: 600;
    color: #fff;
    background: linear-gradient(135deg, #00a8ff 0%, #0077cc 100%);
    border-radius: var(--radius-sm);
    text-decoration: none;
}

/* ==================== HERO Section ==================== */
.hero {
    position: relative;
    height: 100vh;
    min-height: 700px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(0, 168, 255, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 168, 255, 0.04) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 0%, transparent 100%);
}

.hero-glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    animation: pulse-glow 6s ease-in-out infinite;
}

.hero-glow-1 {
    width: 600px;
    height: 600px;
    top: -100px;
    right: -100px;
    background: radial-gradient(circle, rgba(0, 168, 255, 0.15) 0%, transparent 70%);
}

.hero-glow-2 {
    width: 400px;
    height: 400px;
    bottom: 0;
    left: -50px;
    background: radial-gradient(circle, rgba(108, 59, 255, 0.1) 0%, transparent 70%);
    animation-delay: 3s;
}

.hero-particles {
    position: absolute;
    inset: 0;
}

.particle {
    position: absolute;
    width: 2px;
    height: 2px;
    background: rgba(0, 168, 255, 0.6);
    border-radius: 50%;
    animation: float linear infinite;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 900px;
    padding: 0 24px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-heading);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 2px;
    color: var(--accent-blue);
    text-transform: uppercase;
    padding: 8px 20px;
    border: 1px solid var(--border-hover);
    border-radius: 30px;
    margin-bottom: 32px;
    animation-delay: 0.2s;
}

.hero-title {
    font-size: clamp(48px, 8vw, 96px);
    font-weight: 900;
    line-height: 1.05;
    letter-spacing: 2px;
    margin-bottom: 24px;
    animation-delay: 0.4s;
}

.title-line {
    display: block;
    color: var(--text-primary);
}

.title-accent {
    background: linear-gradient(135deg, #00a8ff 0%, #00d4ff 50%, #6c3bff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(15px, 2vw, 18px);
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 40px;
    animation-delay: 0.6s;
}

.hero-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 64px;
    animation-delay: 0.8s;
}

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 40px;
    animation-delay: 1s;
    flex-wrap: wrap;
}

.stat-item {
    display: flex;
    align-items: baseline;
    gap: 4px;
}

.stat-number {
    font-family: var(--font-heading);
    font-size: 36px;
    font-weight: 800;
    color: var(--accent-blue);
    line-height: 1;
}

.stat-unit {
    font-family: var(--font-heading);
    font-size: 24px;
    font-weight: 700;
    color: var(--accent-blue);
}

.stat-label {
    font-size: 13px;
    color: var(--text-muted);
    margin-left: 4px;
    white-space: nowrap;
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: var(--border);
}

.hero-scroll-hint {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    color: var(--text-muted);
    z-index: 1;
    cursor: pointer;
    text-decoration: none;
}

.scroll-mouse {
    width: 24px;
    height: 38px;
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: 12px;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: 6px;
}

.scroll-wheel {
    width: 3px;
    height: 8px;
    background: var(--accent-blue);
    border-radius: 2px;
    animation: scroll-wheel 2s ease-in-out infinite;
}

.scroll-text {
    font-size: 11px;
    letter-spacing: 2px;
    text-transform: uppercase;
}

/* ==================== ABOUT Section ==================== */
.about {
    background: var(--bg-secondary);
    position: relative;
}

.about::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-hover), transparent);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-size: 15px;
    line-height: 1.8;
}

.about-lead {
    font-size: 17px !important;
    color: var(--text-primary) !important;
}

.about-lead strong {
    color: var(--accent-blue);
    font-weight: 600;
}

.about-credentials {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 32px;
}

.credential-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: var(--text-secondary);
}

.about-image {
    position: relative;
}

.about-image-card {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border);
}

.about-image-card img {
    width: 100%;
    height: 400px;
    object-fit: cover;
    filter: brightness(0.8) saturate(0.9);
    transition: transform var(--transition-slow), filter var(--transition-slow);
}

.about-image-card:hover img {
    transform: scale(1.03);
    filter: brightness(0.9) saturate(1);
}

.about-image-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(7, 9, 15, 0.8) 0%, transparent 60%);
    display: flex;
    align-items: flex-end;
    padding: 24px;
}

.about-year {
    display: flex;
    align-items: baseline;
    gap: 12px;
}

.year-number {
    font-family: var(--font-heading);
    font-size: 64px;
    font-weight: 900;
    color: var(--accent-blue);
    line-height: 1;
    text-shadow: 0 0 40px rgba(0, 168, 255, 0.5);
}

.year-text {
    font-size: 14px;
    color: rgba(240, 244, 255, 0.7);
    line-height: 1.5;
}

.about-decoration {
    position: absolute;
    top: -20px;
    right: -20px;
    width: 120px;
    height: 120px;
}

.deco-line {
    position: absolute;
    background: var(--accent-blue);
}

.deco-line-1 {
    top: 0;
    right: 0;
    width: 60px;
    height: 2px;
}

.deco-line-2 {
    top: 0;
    right: 0;
    width: 2px;
    height: 60px;
}

.deco-dot {
    position: absolute;
    top: 0;
    right: 0;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent-blue);
    box-shadow: 0 0 10px var(--accent-blue);
}

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

.service-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 32px;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent-blue), transparent);
    transition: left 0.5s ease;
}

.service-card:hover::before { left: 0; }

.service-card:hover {
    border-color: var(--border-hover);
    background: var(--bg-card-hover);
    transform: translateY(-4px);
    box-shadow: 0 8px 40px rgba(0, 168, 255, 0.1);
}

.service-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-blue-dim);
    border-radius: var(--radius-md);
    color: var(--accent-blue);
    margin-bottom: 20px;
    transition: all var(--transition-normal);
}

.service-card:hover .service-icon {
    background: rgba(0, 168, 255, 0.2);
    box-shadow: 0 0 20px rgba(0, 168, 255, 0.3);
}

.service-title {
    font-family: var(--font-heading);
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.service-desc {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
}

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

.service-tags span {
    font-size: 12px;
    font-weight: 500;
    padding: 4px 10px;
    background: rgba(0, 168, 255, 0.08);
    border: 1px solid rgba(0, 168, 255, 0.15);
    border-radius: 4px;
    color: var(--accent-blue);
}

/* ==================== SOLUTIONS Section ==================== */
.solutions {
    background: var(--bg-secondary);
}

.solutions-tabs {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 48px;
}

.solution-tab {
    font-family: var(--font-heading);
    font-size: 14px;
    font-weight: 600;
    padding: 10px 24px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    background: transparent;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.solution-tab:hover {
    border-color: var(--border-hover);
    color: var(--text-primary);
}

.solution-tab.active {
    background: var(--accent-blue-dim);
    border-color: var(--accent-blue);
    color: var(--accent-blue);
}

.solutions-content {
    min-height: 400px;
}

.solution-panel {
    display: none;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    animation: fadeIn 0.4s ease;
}

.solution-panel.active { display: grid; }

.solution-image {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border);
    aspect-ratio: 4/3;
}

.solution-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: brightness(0.7) saturate(0.8);
    transition: transform var(--transition-slow), filter var(--transition-slow);
}

.solution-image:hover img {
    transform: scale(1.05);
    filter: brightness(0.8) saturate(0.9);
}

.solution-image-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(0, 168, 255, 0.1) 0%, transparent 60%);
}

.solution-title {
    font-family: var(--font-heading);
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.solution-desc {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 24px;
}

.solution-features {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 32px;
}

.solution-features li {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: var(--text-secondary);
}

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

.case-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: all var(--transition-normal);
}

.case-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.3);
}

.case-image {
    position: relative;
    aspect-ratio: 16/9;
    overflow: hidden;
}

.case-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: brightness(0.7) saturate(0.8);
    transition: all var(--transition-normal);
}

.case-card:hover .case-image img {
    filter: brightness(0.85) saturate(1);
    transform: scale(1.05);
}

.case-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(7, 9, 15, 0.9) 0%, transparent 50%);
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-end;
    padding: 20px;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.case-card:hover .case-overlay { opacity: 1; }

.case-tag {
    font-family: var(--font-heading);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--accent-blue);
    padding: 4px 10px;
    border: 1px solid var(--accent-blue);
    border-radius: 3px;
    margin-bottom: 8px;
}

.case-link {
    display: flex;
    align-items: center;
    gap: 4px;
    font-family: var(--font-heading);
    font-size: 13px;
    font-weight: 600;
    color: #fff;
}

.case-info {
    padding: 20px;
}

.case-title {
    font-family: var(--font-heading);
    font-size: 17px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.case-meta {
    font-size: 12px;
    color: var(--accent-blue);
    margin-bottom: 8px;
    font-family: var(--font-heading);
}

.case-desc {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ==================== ADVANTAGES Section ==================== */
.advantages {
    background: var(--bg-secondary);
    position: relative;
}

.advantages::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-hover), transparent);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
    margin-bottom: 64px;
}

.advantage-item {
    text-align: center;
    padding: 40px 24px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
    position: relative;
}

.advantage-item:hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
    box-shadow: 0 8px 40px rgba(0, 168, 255, 0.08);
}

.advantage-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-blue-dim);
    border-radius: 50%;
    color: var(--accent-blue);
}

.advantage-number {
    font-family: var(--font-heading);
    font-size: 52px;
    font-weight: 900;
    color: var(--accent-blue);
    line-height: 1;
    margin-bottom: 12px;
    text-shadow: 0 0 30px rgba(0, 168, 255, 0.3);
}

.advantage-title {
    font-family: var(--font-heading);
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.advantage-desc {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.7;
}

.advantages-cta {
    text-align: center;
    padding: 48px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    position: relative;
    overflow: hidden;
}

.advantages-cta::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent-blue), transparent);
}

.advantages-cta p {
    font-size: 18px;
    color: var(--text-primary);
    margin-bottom: 24px;
    font-family: var(--font-heading);
    font-weight: 600;
}

/* ==================== HERO Slideshow ==================== */
.hero-slideshow {
    position: absolute;
    inset: 0;
    z-index: 1;
}

.hero-slide {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.5s ease, visibility 0.5s ease;
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
}
.hero-slide.active {
    opacity: 1;
    visibility: visible;
}

.hero-slide::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(
        to bottom,
        rgba(7, 9, 15, 0.45) 0%,
        rgba(7, 9, 15, 0.60) 50%,
        rgba(7, 9, 15, 0.88) 100%
    );
    z-index: 0;
}

.hero-slide > .hero-content {
    position: relative;
    z-index: 1;
}

.slideshow-controls {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    display: flex;
    align-items: center;
    gap: 16px;
}

.slideshow-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 1px solid rgba(0, 168, 255, 0.3);
    background: rgba(13, 17, 23, 0.6);
    color: rgba(240, 244, 255, 0.7);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    backdrop-filter: blur(8px);
}
.slideshow-btn:hover {
    border-color: var(--accent-blue);
    color: var(--accent-blue);
    background: rgba(0, 168, 255, 0.1);
}

.slideshow-dots {
    display: flex;
    gap: 8px;
    align-items: center;
}

.dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    border: 1px solid rgba(0, 168, 255, 0.4);
    background: transparent;
    cursor: pointer;
    transition: all 0.3s;
    padding: 0;
}
.dot.active, .dot:hover {
    width: 24px;
    border-radius: 4px;
    background: var(--accent-blue);
    border-color: var(--accent-blue);
}

/* ==================== CONTACT Section ==================== */
.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.contact-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 32px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-icon-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.contact-icon-wrap {
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-blue-dim);
    border-radius: var(--radius-sm);
    color: var(--accent-blue);
}

.contact-icon-item h5 {
    font-family: var(--font-heading);
    font-size: 14px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.contact-icon-item p {
    font-size: 14px;
    color: var(--text-secondary);
}

.contact-mobile {
    font-size: 13px !important;
    color: var(--text-muted) !important;
    margin-top: 2px;
}

.contact-map {
    border-radius: var(--radius-md);
    overflow: hidden;
}

.map-placeholder {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-image:
        linear-gradient(rgba(0, 168, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 168, 255, 0.03) 1px, transparent 1px);
    background-size: 30px 30px;
}

.map-info {
    text-align: center;
    color: var(--text-secondary);
}

.map-info p {
    margin-top: 12px;
    font-size: 15px;
    color: var(--text-primary);
}

.map-sub {
    font-size: 13px !important;
    color: var(--text-muted) !important;
    margin-top: 4px !important;
}

.contact-form-wrapper {
    position: sticky;
    top: calc(var(--nav-height) + 24px);
}

.contact-form-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 40px;
}

.form-title {
    font-family: var(--font-heading);
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.form-subtitle {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 28px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    font-family: var(--font-heading);
}

.required {
    color: #e74c3c;
}

.form-group input,
.form-group textarea {
    width: 100%;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
    padding: 12px 16px;
    color: var(--text-primary);
    font-size: 14px;
    transition: all var(--transition-fast);
    outline: none;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--accent-blue);
    background: rgba(0, 168, 255, 0.04);
    box-shadow: 0 0 0 3px rgba(0, 168, 255, 0.1);
}

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

.form-success {
    text-align: center;
    padding: 40px 20px;
}

.form-success svg {
    margin: 0 auto 16px;
}

.form-success h4 {
    font-family: var(--font-heading);
    font-size: 22px;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.form-success p {
    font-size: 14px;
    color: var(--text-secondary);
}

/* ==================== FOOTER ==================== */
.footer {
    background: #05070c;
    border-top: 1px solid var(--border);
    padding: 60px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 48px;
    padding-bottom: 48px;
    border-bottom: 1px solid var(--border);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
}

.footer-logo span {
    font-family: var(--font-heading);
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
}

.footer-desc {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
}

.footer-social {
    display: flex;
    gap: 10px;
}

.social-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-blue-dim);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--accent-blue);
    transition: all var(--transition-fast);
}

.social-btn:hover {
    background: rgba(0, 168, 255, 0.2);
    border-color: var(--accent-blue);
}

.footer-heading {
    font-family: var(--font-heading);
    font-size: 14px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 20px;
    letter-spacing: 1px;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links a {
    font-size: 14px;
    color: var(--text-secondary);
    transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.footer-links a:hover {
    color: var(--accent-blue);
    padding-left: 4px;
}

.footer-contact-info {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-contact-info li {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-secondary);
}

.footer-contact-info svg { flex-shrink: 0; }

.footer-bottom {
    padding: 24px 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px;
}

.footer-bottom p {
    font-size: 13px;
    color: var(--text-muted);
}

/* ==================== FAB ==================== */
.fab-container {
    position: fixed;
    bottom: 32px;
    right: 32px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    z-index: 998;
}

.fab-btn {
    position: relative;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    border: none;
}

.fab-btn:hover {
    transform: scale(1.1);
}

.fab-btn:hover .fab-label {
    opacity: 1;
    transform: translateX(0);
    pointer-events: auto;
}

.fab-label {
    position: absolute;
    right: calc(100% + 10px);
    top: 50%;
    transform: translateX(10px) translateY(-50%);
    background: rgba(0, 0, 0, 0.9);
    color: #fff;
    font-family: var(--font-heading);
    font-size: 12px;
    font-weight: 600;
    padding: 5px 12px;
    border-radius: 4px;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition-normal);
}

.fab-phone { background: #e74c3c; }
.fab-phone:hover { box-shadow: 0 4px 24px rgba(231, 76, 60, 0.5); }

.fab-wechat { background: #27ae60; }
.fab-wechat:hover { box-shadow: 0 4px 24px rgba(39, 174, 96, 0.5); }

.fab-message { background: var(--accent-blue); }
.fab-message:hover { box-shadow: 0 4px 24px rgba(0, 168, 255, 0.5); }

.fab-top {
    background: #1e293b;
}
.fab-top:hover { box-shadow: 0 4px 24px rgba(30, 41, 59, 0.6); }

/* ==================== MODALS ==================== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(8px);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal-box {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 40px;
    max-width: 400px;
    width: 100%;
    position: relative;
    text-align: center;
    transform: scale(0.9);
    transition: transform var(--transition-normal);
}

.modal-overlay.active .modal-box {
    transform: scale(1);
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: color var(--transition-fast);
    background: none;
    border: none;
}

.modal-close:hover { color: var(--text-primary); }

.modal-icon {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

.modal-icon-phone {
    background: rgba(231, 76, 60, 0.15);
    color: #e74c3c;
}

.modal-icon-wechat {
    background: rgba(39, 174, 96, 0.15);
    color: #27ae60;
}

.modal-title {
    font-family: var(--font-heading);
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.modal-subtitle {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.modal-phone-number {
    font-family: var(--font-heading);
    font-size: 32px;
    font-weight: 900;
    color: var(--accent-blue);
    margin-bottom: 8px;
}

.modal-phone-desc {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 24px;
}

.modal-wechat {
    max-width: 360px;
}

.wechat-qr {
    margin: 0 auto 20px;
}

.wechat-qr img {
    width: 200px;
    height: 200px;
    margin: 0 auto;
    border-radius: var(--radius-md);
}

.wechat-qr-placeholder {
    width: 200px;
    height: 200px;
    margin: 0 auto;
    background: rgba(0, 168, 255, 0.05);
    border: 2px dashed rgba(0, 168, 255, 0.2);
    border-radius: var(--radius-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.wechat-qr-placeholder p {
    font-size: 14px;
    color: var(--text-secondary);
}

.wechat-id {
    font-family: var(--font-heading);
    font-size: 16px !important;
    font-weight: 700;
    color: var(--accent-blue) !important;
}

.wechat-tip {
    font-size: 12px;
    color: var(--text-muted);
}

/* ==================== Responsive ==================== */
@media (max-width: 1024px) {
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

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

@media (max-width: 768px) {
    .nav-links, .nav-phone-btn { display: none; }
    .mobile-menu-btn { display: flex; }

    .section { padding: 72px 0; }

    .about-content {
        grid-template-columns: 1fr;
        gap: 48px;
    }

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

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

    .solution-image { aspect-ratio: 16/9; }

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

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

    .advantage-number { font-size: 40px; }

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

    .contact-form-wrapper { position: static; }

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

    .hero-stats {
        gap: 24px;
    }

    .stat-divider { display: none; }

    .form-row {
        grid-template-columns: 1fr;
    }

    .fab-container {
        bottom: 20px;
        right: 16px;
    }

    .fab-btn { width: 44px; height: 44px; }

    .hero-title { letter-spacing: 1px; }

    .about-credentials {
        grid-template-columns: 1fr;
    }
}

    .slideshow-controls { bottom: 90px; }
    .slideshow-dots { gap: 6px; }

    .hero-slide > .hero-content {
        padding: 0 16px;
        max-width: 100%;
    }
}

@media (max-width: 480px) {
    .cases-grid {
        grid-template-columns: 1fr;
    }

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

    .solutions-tabs {
        gap: 8px;
    }

    .solution-tab {
        padding: 8px 16px;
        font-size: 13px;
    }

    .hero-actions {
        flex-direction: column;
        width: 100%;
    }

    .hero-actions .btn {
        width: 100%;
        justify-content: center;
    }

    .hero-slide > .hero-content {
        padding: 0 12px;
    }

    .hero-stats {
        gap: 16px;
    }

    .slideshow-controls {
        bottom: 80px;
        gap: 10px;
    }
    .slideshow-btn {
        width: 32px;
        height: 32px;
    }

    .contact-form-card { padding: 24px; }

    .modal-box { padding: 28px; }
}