:root{
    --color-primary:#0ea5e9;
    --color-primary-dark:#075985;
    --color-primary-darker:#052e3f;
    --color-accent:#22c55e;
    --color-accent-dark:#16a34a;
    --color-success:#34d399;
    --color-danger:#ef4444;

    --color-text:#0f172a;
    --color-text-muted:#475569;
    --color-text-light:#64748b;
    --color-bg:#f7fafc;
    --color-bg-soft:#ffffff;
    --color-bg-muted:#eef2ff;
    --color-border:#dbeafe;
    --color-border-soft:#e2e8f0;

    --gradient-hero: #0b1220;
    --gradient-deep: #050b1a;
    --gradient-dept: #111827;
    --gradient-security: #0b1220;
    --gradient-mission: #0b1220;
    --gradient-trust: #050b1a;
    --gradient-cta: #0b1220;
    --gradient-accent: #22c55e;
    --gradient-icon: #0ea5e9;

    --glass-bg: rgba(255, 255, 255, 0.06);
    --glass-border: rgba(14, 165, 233, 0.22);
    --glass-blur: none;

    --shadow-sm:none;
    --shadow-md:none;
    --shadow-lg:none;
    --shadow-xl:none;
    --shadow-primary:none;
    --shadow-accent:none;

    --radius-sm:2px;
    --radius-md:4px;
    --radius-lg:6px;
    --radius-pill:24px;

    --space-xs:0.5rem;
    --space-sm:1rem;
    --space-md:1.5rem;
    --space-lg:2rem;
    --space-xl:3rem;
    --space-2xl:5rem;

    --transition-fast:160ms cubic-bezier(.2,.8,.2,1);
    --transition-base:220ms cubic-bezier(.2,.8,.2,1);
    --transition-slow:360ms cubic-bezier(.2,.8,.2,1);
}

:where(body){
    color:var(--color-text);
    background:var(--color-bg);
    line-height:1.6;
    -webkit-font-smoothing:antialiased;
}

:where(img){
    max-width:100%;
    height:auto;
}

.bg-glass{
    background:var(--glass-bg);
    backdrop-filter:var(--glass-blur);
    -webkit-backdrop-filter:var(--glass-blur);
    border:1px solid var(--glass-border);
}

.icon-circle{
    width:60px;
    height:60px;
    background:var(--gradient-icon);
    border-radius:50%;
    display:inline-flex;
    align-items:center;
    justify-content:center;
    color:#06121f;
    font-size:1.5rem;
    flex-shrink:0;
}

.header{
    background:#ffffff;
    z-index:1030;
    border-bottom:1px solid var(--color-border-soft);
}

.header .navbar-brand img{
    transition:transform var(--transition-fast);
    border-radius:2px;
}

.header .navbar-brand:hover img{
    transform:scale(1.03);
}

.header .nav-link{
    font-weight:500;
    color:var(--color-text-muted);
    transition:color var(--transition-fast), text-decoration-color var(--transition-fast);
}

.header .nav-link:hover{
    color:var(--color-primary-dark);
}

.hero-section{
    min-height:480px;
    background:var(--gradient-hero);
    color:#ffffff;
    padding-block:var(--space-2xl);
    position:relative;
    overflow:hidden;
}

.hero-section::before{
    content:'';
    position:absolute;
    inset:0;
    background:rgba(2, 6, 23, 0.55);
    z-index:0;
    pointer-events:none;
}

.hero-section > .container{
    position:relative;
    z-index:1;
}

.hero-section h1{
    font-size:clamp(2rem, 4vw, 2.8rem);
    font-weight:800;
    margin-bottom:var(--space-sm);
    line-height:1.2;
    text-shadow:0 1px 0 rgba(0,0,0,0.25);
}

.hero-section h2{
    font-size:clamp(1.1rem, 2vw, 1.4rem);
    opacity:0.95;
    margin-bottom:var(--space-md);
    font-weight:600;
    color:#e5f3ff;
}

.hero-section .lead{
    font-size:1.1rem;
    max-width:700px;
    margin-inline:auto;
    opacity:0.98;
    color:#dbeafe;
    text-shadow:0 1px 0 rgba(0,0,0,0.18);
}

.hero-buttons{
    display:flex;
    gap:var(--space-sm);
    justify-content:center;
    flex-wrap:wrap;
    margin-block-start:var(--space-md);
}

.notice-bar{
    animation:noticeSlideIn 420ms cubic-bezier(.2,.8,.2,1);
}

.notice-bar a{
    transition:opacity var(--transition-fast);
}

.notice-bar a:hover{
    opacity:0.78;
}

@keyframes noticeSlideIn{
    from{transform:translateY(-70%); opacity:0;}
    to{transform:translateY(0); opacity:1;}
}

.breadcrumb-nav{
    background:var(--color-bg-muted);
    border-bottom:1px solid var(--color-border-soft);
}

.breadcrumb-nav .breadcrumb-item a{
    transition:color var(--transition-fast), text-decoration-color var(--transition-fast);
    color:var(--color-text-muted);
}

.breadcrumb-nav .breadcrumb-item a:hover{
    color:var(--color-primary-darker) !important;
    text-decoration-color:rgba(14, 165, 233, 0.75);
}

.why-us-section{
    background:var(--color-bg-soft);
}

.whyus-card{
    background:#ffffff;
    border:1px solid var(--color-border);
    border-radius:var(--radius-lg);
    padding:var(--space-md);
    transition:transform var(--transition-base), border-color var(--transition-base), background-color var(--transition-base);
    height:100%;
}

.whyus-card:hover{
    transform:translateY(-2px);
    box-shadow:none;
    background:#f8fbff;
    border-color:rgba(14, 165, 233, 0.65);
}

.about-section{
    background:var(--gradient-deep);
    color:#ffffff;
}

.about-img-wrap{
    overflow:hidden;
    border-radius:var(--radius-lg);
    border:1px solid rgba(148, 163, 184, 0.25);
    background:#0b1220;
}

.about-img-wrap img{
    transition:transform var(--transition-slow);
}

.about-img-wrap:hover img{
    transform:scale(1.04);
}

.about-card{
    transition:transform var(--transition-base), background-color var(--transition-base), border-color var(--transition-base);
    border:1px solid rgba(226, 232, 240, 0.18);
    border-radius:var(--radius-md);
    background:rgba(255,255,255,0.03);
}

.about-card:hover{
    transform:translateY(-2px);
    background:rgba(255, 255, 255, 0.07);
    border-color:rgba(34, 197, 94, 0.35);
}

.text-white-75{
    color:rgba(255,255,255,0.78) !important;
}

.departments-section{
    background:var(--gradient-dept);
    color:#ffffff;
    border-top:1px solid rgba(226, 232, 240, 0.14);
}

.departments-title{
    font-size:clamp(1.6rem, 3vw, 2.2rem);
    font-weight:800;
    margin-bottom:var(--space-sm);
    color:#e0f2fe;
}

.departments-subtitle{
    font-size:1.05rem;
    max-width:800px;
    margin-inline:auto;
    color:rgba(219, 234, 254, 0.88);
}

.departments-grid{
    display:grid;
    grid-template-columns:1fr;
    gap:var(--space-lg);
    margin-block-start:var(--space-lg);
    align-items:baseline;
}

@media (min-width:768px){
    .departments-grid{
        grid-template-columns:1fr 1fr;
    }
}

.d-item{
    background:rgba(255,255,255,0.05);
    backdrop-filter:var(--glass-blur);
    -webkit-backdrop-filter:var(--glass-blur);
    padding:var(--space-md);
    border-radius:var(--radius-md);
    margin-bottom:var(--space-sm);
    border:1px solid rgba(14, 165, 233, 0.28);
}

.d-num{
    font-size:1.5rem;
    font-weight:800;
    color:var(--color-accent);
    margin-bottom:var(--space-xs);
    text-shadow:none;
}

.d-num span{
    color:#e0f2fe;
    font-size:1.1rem;
    margin-inline-start:var(--space-xs);
}

.d-image{
    margin-bottom:var(--space-sm);
}

.d-image img{
    width:100%;
    border-radius:var(--radius-md);
    border:1px solid rgba(226, 232, 240, 0.25);
}

.security-section{
    background:var(--gradient-security);
    color:#ffffff;
    border-top:1px solid rgba(226, 232, 240, 0.14);
}

.security-network{
    position:relative;
    max-width:800px;
    margin:var(--space-xl) auto;
    min-height:400px;
    display:grid;
    grid-template-columns:1fr;
    gap:var(--space-md);
    align-items:baseline;
}

@media (min-width:768px){
    .security-network{
        grid-template-columns:repeat(3, 1fr);
        grid-template-rows:repeat(3, auto);
    }

    .core-node{grid-column:2; grid-row:2;}
    .node-top-left{grid-column:1; grid-row:1;}
    .node-top-right{grid-column:3; grid-row:1;}
    .node-bottom-left{grid-column:1; grid-row:3;}
    .node-bottom-right{grid-column:3; grid-row:3;}
}

.core-node{
    background:var(--gradient-accent);
    border-radius:50%;
    width:140px;
    height:140px;
    display:flex;
    flex-direction:column;
    align-items:center;
    justify-content:center;
    margin-inline:auto;
    color:rgba(3, 7, 18, 0.95);
    font-weight:900;
    box-shadow:none;
    border:2px solid rgba(255,255,255,0.18);
}

.node{
    background:rgba(255,255,255,0.04);
    backdrop-filter:var(--glass-blur);
    -webkit-backdrop-filter:var(--glass-blur);
    border-radius:var(--radius-md);
    padding:var(--space-sm);
    text-align:center;
    color:#ffffff;
    transition:transform var(--transition-base), background-color var(--transition-base), border-color var(--transition-base);
    border:1px solid rgba(34, 197, 94, 0.25);
}

.node:hover{
    transform:scale(1.03);
    background:rgba(255, 255, 255, 0.07);
    border-color:rgba(14, 165, 233, 0.45);
}

.node-title{
    font-weight:700;
    color:#34d399;
    margin-block:var(--space-xs);
    text-shadow:none;
}

@media (max-width:767.98px){
    .core-node{width:120px; height:120px;}
}

.honor-section{
    background:var(--color-bg-soft);
    border-top:1px solid var(--color-border-soft);
}

.honor-row{
    padding-block:var(--space-sm);
}

.honor-text-card{
    padding:var(--space-md);
    background:#ffffff;
    border-radius:var(--radius-md);
    border-inline-start:4px solid var(--color-primary);
    transition:transform var(--transition-base), border-color var(--transition-base), background-color var(--transition-base);
    border:1px solid var(--color-border-soft);
}

.honor-text-card:hover{
    transform:translateY(-2px);
    box-shadow:none;
    background:#f7fbff;
    border-inline-start-color:rgba(34, 197, 94, 0.9);
}

.mission-section{
    background:var(--gradient-mission);
    padding-block:var(--space-2xl);
    color:#ffffff;
    border-top:1px solid rgba(226, 232, 240, 0.12);
}

.mission-list li{
    margin-bottom:var(--space-sm);
    color:rgba(226, 232, 240, 0.86);
}

.stats-section{
    background:#ffffff;
    border-top:1px solid var(--color-border-soft);
}

.stats-card{
    transition:transform var(--transition-base), background-color var(--transition-base), border-color var(--transition-base);
    background:var(--color-bg-soft);
    border:1px solid var(--color-border-soft);
    border-radius:var(--radius-md);
}

.stats-card:hover{
    transform:translateY(-2px);
    box-shadow:none;
    background:#f8fafc;
    border-color:rgba(14, 165, 233, 0.45);
}

.stats-card h3{
    font-variant-numeric:tabular-nums;
    color:var(--color-primary-dark);
}

.news-section{
    background:var(--color-bg-soft);
    border-top:1px solid var(--color-border-soft);
}

.news-card{
    transition:transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base), background-color var(--transition-base);
    border:1px solid var(--color-border-soft);
    border-radius:var(--radius-md);
    background:#ffffff;
}

.news-card:hover{
    transform:translateY(-2px);
    box-shadow:none;
    border-color:rgba(14, 165, 233, 0.55);
    background:#f7fbff;
}

.news-img-wrap{
    height:200px;
    overflow:hidden;
    position:relative;
}

.news-img-wrap img{
    width:100%;
    height:100%;
    object-fit:cover;
    transition:transform var(--transition-slow);
}

.news-card:hover .news-img-wrap img{
    transform:scale(1.05);
}

.matches-section{
    background:var(--color-bg-soft);
    border-top:1px solid var(--color-border-soft);
}

.match-card{
    transition:transform var(--transition-base), border-color var(--transition-base), background-color var(--transition-base);
    border:1px solid var(--color-border-soft);
    border-radius:var(--radius-md);
    background:#ffffff;
}

.match-card:hover{
    transform:translateY(-2px);
    box-shadow:none;
    border-color:rgba(34, 197, 94, 0.85);
    background:#fbfffe;
}

.match-card .team{
    min-width:0;
}

.match-card .team .small{
    overflow:hidden;
    text-overflow:ellipsis;
    white-space:nowrap;
}

.match-card .score{
    font-variant-numeric:tabular-nums;
    color:var(--color-primary-dark);
}

.trust-section{
    background:var(--gradient-trust);
    color:#ffffff;
    border-top:1px solid rgba(226, 232, 240, 0.14);
}

.trust-card{
    background:rgba(255,255,255,0.05);
    backdrop-filter:var(--glass-blur);
    -webkit-backdrop-filter:var(--glass-blur);
    border-radius:var(--radius-md);
    padding:var(--space-lg) var(--space-sm);
    height:100%;
    transition:transform var(--transition-base), background-color var(--transition-base), border-color var(--transition-base);
    border:1px solid rgba(14, 165, 233, 0.28);
}

.trust-card:hover{
    transform:translateY(-2px);
    background:rgba(255, 255, 255, 0.07);
    border-color:rgba(34, 197, 94, 0.45);
}

.partners-section{
    background:var(--color-bg-soft);
    border-top:1px solid var(--color-border-soft);
}

.partner-card{
    transition:transform var(--transition-base), border-color var(--transition-base), background-color var(--transition-base);
}

.partner-card:hover{
    transform:translateY(-2px);
    box-shadow:none;
    background:#f7fbff;
    border-color:rgba(14, 165, 233, 0.45);
}

.testimonials-section{
    background:#ffffff;
    border-top:1px solid var(--color-border-soft);
}

.testimonial-card{
    transition:transform var(--transition-base), border-color var(--transition-base), background-color var(--transition-base);
    border-block-start:4px solid transparent;
    border-radius:var(--radius-md);
    border:1px solid var(--color-border-soft);
    background:#ffffff;
}

.testimonial-card:hover{
    border-block-start-color:var(--color-accent);
    transform:translateY(-2px);
    box-shadow:none;
    background:#fbfffe;
    border-color:rgba(34, 197, 94, 0.35);
}

.cta-banner-section{
    background:var(--gradient-cta);
    color:#ffffff;
    position:relative;
    overflow:hidden;
    border-top:1px solid rgba(226, 232, 240, 0.12);
}

.cta-banner-section::before{
    content:'';
    position:absolute;
    inset:0;
    background:rgba(2, 6, 23, 0.6);
    z-index:0;
}

.cta-banner-section > .container{
    position:relative;
    z-index:1;
}

.cta-banner-section .btn-warning{
    box-shadow:none;
    border:1px solid rgba(251, 191, 36, 0.45);
    background:#fbbf24;
    color:#052e16;
}

.text-white-75{
    color:rgba(255, 255, 255, 0.84) !important;
}

.footer{
    font-size:0.9rem;
    color:#64748b;
    border-top:1px solid var(--color-border-soft);
}

.footer a {
    transition: color 180ms cubic-bezier(0.2, 0.8, 0.2, 1);
    color: var(--color-text, #0b1220);
}

.footer a:hover {
    color: var(--color-accent, #2563eb) !important;
}

.footer-copyright {
    font-size: 0.85rem;
}

.footer-beian {
    font-size: 0.8rem;
    line-height: 1.8;
    opacity: 0.72;
    color: var(--color-muted, #526173);
}

.footer-beian a:hover {
    color: var(--color-accent, #2563eb) !important;
    text-decoration: underline !important;
}

.footer-beian img {
    margin-inline-end: 4px;
    transition: transform 220ms cubic-bezier(0.2, 0.8, 0.2, 1);
    opacity: 0.95;
}

.footer-beian a:hover img {
    transform: scale(1.18);
    opacity: 1;
}

.footer-beian li {
    white-space: nowrap;
}

/* ============================================
   Responsive Defaults
   ============================================================ */
@media (max-width: 575.98px) {
    .footer-beian ul {
        flex-direction: column;
        gap: var(--space-xs) !important;
    }

    .footer-beian li {
        white-space: normal;
        text-align: center;
    }
}

/* ============================================
   22. Form (Login/Signup/Contact)
   ============================================ */
.form-control:focus,
.form-select:focus {
    border-color: var(--color-primary, #3b82f6);
    box-shadow: none;
    outline: 2px solid rgba(59, 130, 246, 0.28);
    outline-offset: 1px;
}

.btn-primary {
    background-color: var(--color-primary, #3b82f6);
    border-color: var(--color-primary, #3b82f6);
    color: #ffffff;
    border-radius: 4px;
    box-shadow: none;
}

.btn-primary:hover,
.btn-primary:focus {
    background-color: #2563eb;
    border-color: #2563eb;
    box-shadow: none;
    color: #ffffff;
}

.input-group-text {
    background-color: var(--color-bg-muted, #f3f4f6);
    border-color: var(--color-border, #e5e7eb);
    color: #111827;
    border-radius: 4px;
    box-shadow: none;
}

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

/* ============================================================
   Grid Layout Defaults (CSS-Variant-Ready)
   CSSVariantEngine sẽ override các rules này
   ============================================================ */

/* 新闻网格 (默认 3 列) */
.news-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

/* 功能特性列表 (默认 3 列) */
.feature-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

/* 用户评价 (默认 3 列) */
.testimonial-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

/* 合作伙伴 (默认 4 列) */
.partner-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    align-items: center;
}

/* 数据统计 (默认 4 列) */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    text-align: center;
}

/* FAQ 列表 (默认单列居中) */
.faq-list {
    max-width: 820px;
    margin: 0 auto;
}

/* Hero 内容 (默认居中) */
.hero-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

/* Hero 分割布局 (左文右图) */
.hero-split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    align-items: center;
}
.hero-split-text { }
.hero-split-img { text-align: center; }

/* CTA 内容 (默认居中) */
.cta-inner {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

/* 作者团队 (默认 4 列) */
.authors-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

/* 联系渠道 (默认 3 列) */
.channels-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

/* 文章列表 (默认 2 列) */
.post-list-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

/* 相关文章 (默认 3 列) */
.related-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

/* 赛事列表 (默认 3 列) */
.matches-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

/* 步 骤网格 (默认 4 列) */
.steps-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

/* 二维码网格 (默认 3 列) */
.qr-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    justify-items: center;
}

/* 荣誉列表 (默认 2 列交替) */
.honor-list {
    display: flex;
    flex-direction: column;
    gap: 3rem;
}
.honor-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    align-items: center;
}
.honor-row-reverse {
    direction: rtl;
}
.honor-row-reverse > * {
    direction: ltr;
}

/* ============================================================
   Responsive Defaults
   ============================================================ */
@media (max-width: 1024px) {
    .news-grid,
    .feature-list,
    .channels-grid,
    .testimonial-list { grid-template-columns: repeat(2, 1fr); }

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

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

    .hero-split { grid-template-columns: 1fr; }
    .honor-row { grid-template-columns: 1fr; }
    .honor-row-reverse { direction: ltr; }
}

@media (max-width: 640px) {
    .news-grid,
    .feature-list,
    .testimonial-list,
    .channels-grid,
    .post-list-grid,
    .related-grid,
    .authors-grid,
    .matches-grid { grid-template-columns: 1fr; }

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

    .steps-grid { grid-template-columns: 1fr; }
    .qr-grid { grid-template-columns: 1fr; max-width: 300px; margin: 0 auto; }

    .faq-list { max-width: 100%; }
}