*,*::before,*::after{box-sizing:border-box}
*{margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;-webkit-tap-highlight-color:transparent}
body{margin:0;min-height:100vh;background:var(--color-paper);color:var(--color-ink);font-family:var(--font-body);font-size:var(--fs-base);line-height:1.75;overflow-x:hidden}
img,svg,video{max-width:100%;display:block;height:auto}
a{color:var(--color-mid-blue);text-decoration-thickness:2px;text-underline-offset:4px}
a:hover{color:var(--color-primary)}
ul,ol{list-style:none}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:none;cursor:pointer;padding:0}
:focus-visible{outline:3px solid var(--color-gold);outline-offset:3px}
::selection{background:var(--color-primary);color:#fff}

:root{
--color-primary:#FF5722;
--color-primary-dark:#D84315;
--color-deep-blue:#0D1B2A;
--color-mid-blue:#1B3A5C;
--color-gold:#FFD700;
--color-paper:#F5F0E6;
--color-paper-light:#FDFBF5;
--color-paper-deep:#EDE6D8;
--color-ink:#1A1A1A;
--color-danger:#D32F2F;
--color-gray:#9E9E9E;
--font-heading:'Alibaba PuHuiTi','Noto Sans SC','PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
--font-body:'Source Han Sans SC','思源黑体','PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
--font-data:'JetBrains Mono','SFMono-Regular','Consolas','Liberation Mono',monospace;
--border-w:3px;
--border-w-sm:2px;
--shadow-hard:6px 6px 0 var(--color-deep-blue);
--shadow-hard-sm:3px 3px 0 var(--color-deep-blue);
--shadow-soft:0 8px 24px rgba(13,27,42,.1);
--sidebar-w:280px;
--header-h:64px;
--container-w:1240px;
--dur-fast:.18s cubic-bezier(.4,0,.2,1);
--dur-med:.3s cubic-bezier(.4,0,.2,1);
--fs-xs:12px;
--fs-sm:14px;
--fs-base:16px;
--fs-lg:20px;
--fs-xl:28px;
--fs-xxl:40px;
--fs-huge:64px;
}

h1,h2,h3,h4,h5,h6{font-family:var(--font-heading);line-height:1.25;font-weight:900;color:var(--color-deep-blue)}
p{max-width:70ch}
#main-content{scroll-margin-top:calc(var(--header-h) + 16px)}
.site-main{margin-top:var(--header-h);margin-left:0;min-height:calc(100vh - var(--header-h))}
.container{width:100%;max-width:var(--container-w);margin:0 auto;padding:0 20px}

@media (min-width:768px){
.container{padding:0 32px}
}

@media (min-width:1024px){
#main-content{scroll-margin-top:16px}
.site-main{margin-top:0;margin-left:var(--sidebar-w);min-height:100vh}
}

/* ===== 无障碍跳转 ===== */
.skip-link{position:fixed;top:-120px;left:16px;z-index:3000;display:inline-block;padding:12px 24px;background:var(--color-primary);color:#fff;font-weight:900;font-size:var(--fs-sm);text-decoration:none;border:2px solid var(--color-ink);box-shadow:4px 4px 0 var(--color-deep-blue);transition:top var(--dur-fast)}
.skip-link:focus{top:16px}

/* ===== 头部 ===== */
.site-header{position:fixed;top:0;left:0;width:100%;height:var(--header-h);z-index:1000;background:var(--color-deep-blue);color:var(--color-paper);border-bottom:2px solid var(--color-primary)}
.site-header__bar{display:flex;align-items:center;justify-content:space-between;height:var(--header-h);padding:0 16px}
.site-header__vert{display:none}
.scroll-progress{position:fixed;top:0;left:0;z-index:4000;height:4px;width:0;background:linear-gradient(90deg,var(--color-primary),var(--color-gold));transition:width .15s ease-out;pointer-events:none}

.site-brand{display:inline-flex;flex-direction:column;gap:3px;text-decoration:none;line-height:1.1;z-index:2}
.site-brand__name{font-family:var(--font-heading);font-weight:900;font-size:24px;color:var(--color-paper);letter-spacing:.04em}
.site-brand__accent{color:var(--color-primary)}
.site-brand__tagline{font-size:11px;color:rgba(245,240,230,.55);letter-spacing:.16em;display:block;line-height:1;margin-top:2px}

.nav-toggle{display:inline-flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;padding:8px 10px;color:var(--color-paper);min-width:48px;min-height:44px}
.nav-toggle__bars{display:flex;flex-direction:column;gap:5px;width:26px}
.nav-toggle__bar{display:block;height:3px;width:100%;background:var(--color-paper);transition:transform var(--dur-fast),opacity var(--dur-fast)}
.nav-toggle.is-active .nav-toggle__bar:nth-child(1){transform:translateY(8px) rotate(45deg)}
.nav-toggle.is-active .nav-toggle__bar:nth-child(2){opacity:0}
.nav-toggle.is-active .nav-toggle__bar:nth-child(3){transform:translateY(-8px) rotate(-45deg)}
.nav-toggle__text{font-size:10px;letter-spacing:.2em;text-transform:uppercase;color:rgba(245,240,230,.6)}

.site-header__panel{position:fixed;top:var(--header-h);left:0;bottom:0;width:min(320px,85vw);background:var(--color-deep-blue);padding:32px 20px 24px;transform:translateX(-110%);transition:transform var(--dur-med);box-shadow:8px 0 0 rgba(13,27,42,.18);display:flex;flex-direction:column;z-index:999;overflow-y:auto}
.site-header__panel[data-open]{transform:translateX(0)}

.site-nav{display:flex;flex-direction:column;flex:1}
.site-nav__heading{font-size:11px;font-weight:700;letter-spacing:.24em;text-transform:uppercase;color:rgba(245,240,230,.4);margin-bottom:16px;padding-left:6px;font-family:var(--font-heading)}
.site-nav__list{display:flex;flex-direction:column;gap:6px}
.site-nav__item{position:relative}
.site-nav__link{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 16px 12px 20px;min-height:46px;background:transparent;color:rgba(245,240,230,.85);font-family:var(--font-heading);font-weight:700;font-size:var(--fs-base);text-decoration:none;clip-path:polygon(12px 0,100% 0,calc(100% - 12px) 100%,0 100%);transition:background-color var(--dur-fast),color var(--dur-fast),filter var(--dur-fast)}
.site-nav__link:hover{background:rgba(255,87,34,.2);color:#fff}
.site-nav__link[aria-current="page"]{background:var(--color-primary);color:#fff}
.site-nav__link:focus-visible{outline:none;filter:drop-shadow(0 0 0 2px var(--color-gold))}
.site-nav__num{font-family:var(--font-data);font-size:var(--fs-xs);opacity:.6;letter-spacing:.08em;transition:opacity var(--dur-fast),color var(--dur-fast)}
.site-nav__link[aria-current="page"] .site-nav__num{opacity:1;color:var(--color-gold)}

.site-header__live{display:flex;align-items:center;gap:8px;margin-top:auto;padding:16px 8px 8px;border-top:2px solid var(--color-mid-blue);font-size:var(--fs-xs);color:rgba(245,240,230,.6);letter-spacing:.06em}
.site-header__live-dot{width:8px;height:8px;border-radius:50%;background:var(--color-primary);animation:live-pulse 2.25s ease-in-out infinite;flex-shrink:0}
.site-header__icp{font-size:11px;color:rgba(245,240,230,.35);letter-spacing:.06em;padding:8px 8px 4px;font-family:var(--font-data)}

@media (min-width:1024px){
.site-header{width:var(--sidebar-w);height:100vh;border-right:var(--border-w) solid var(--color-deep-blue);border-bottom:none;display:flex;flex-direction:column;position:fixed}
.site-header::before{content:'';position:absolute;top:0;right:0;width:56px;height:56px;background:var(--color-primary);clip-path:polygon(100% 0,0 0,100% 100%);z-index:0}
.site-header::after{content:'';position:absolute;bottom:0;left:0;width:100%;height:8px;background:repeating-linear-gradient(135deg,var(--color-gold) 0 12px,var(--color-mid-blue) 12px 24px)}
.site-header__bar{padding:32px 20px 0;display:block;height:auto}
.site-header__vert{display:block;position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);writing-mode:vertical-rl;font-family:var(--font-heading);font-weight:900;font-size:64px;letter-spacing:.1em;color:rgba(245,240,230,.05);z-index:0;pointer-events:none}
.site-header__panel{position:static;transform:none;width:auto;height:100%;padding:32px 20px 24px;background:transparent;box-shadow:none;display:flex;flex-direction:column;z-index:1;position:relative;overflow-y:auto}
.nav-toggle{display:none}
}

/* ===== 页脚 ===== */
.site-footer{background:var(--color-deep-blue);color:var(--color-paper);margin-left:0;border-top:var(--border-w) solid var(--color-primary)}
.site-footer__accent{height:6px;background:repeating-linear-gradient(135deg,var(--color-primary) 0 14px,var(--color-mid-blue) 14px 28px)}
.site-footer__inner{display:grid;grid-template-columns:1fr;gap:32px;padding:40px 20px 32px;max-width:var(--container-w);margin:0 auto}
.site-footer__logo{font-family:var(--font-heading);font-weight:900;font-size:var(--fs-xl);color:var(--color-paper);letter-spacing:.04em}
.site-footer__slogan{font-size:var(--fs-sm);color:var(--color-primary);letter-spacing:.2em;margin-top:4px;font-weight:700}
.site-footer__desc{font-size:var(--fs-sm);color:rgba(245,240,230,.65);max-width:36ch;margin-top:12px;line-height:1.7}
.site-footer__title{font-size:var(--fs-sm);color:var(--color-primary);font-weight:900;letter-spacing:.14em;text-transform:uppercase;margin-bottom:12px;position:relative;padding-left:12px}
.site-footer__title::before{content:'';position:absolute;left:0;top:50%;transform:translateY(-50%);width:4px;height:16px;background:var(--color-primary);clip-path:polygon(0 0,100% 20%,100% 80%,0 100%)}
.site-footer__list{display:flex;flex-direction:column;gap:8px}
.site-footer__link{color:rgba(245,240,230,.75);text-decoration:none;font-size:var(--fs-sm);transition:color var(--dur-fast),padding-left var(--dur-fast)}
.site-footer__link:hover{color:var(--color-gold);padding-left:4px}
.site-footer__contact-item{color:rgba(245,240,230,.75);font-size:var(--fs-sm);line-height:1.6}
.site-footer__bottom{border-top:2px solid var(--color-mid-blue);padding:16px 20px;display:flex;flex-direction:column;align-items:center;gap:6px;text-align:center;font-size:var(--fs-sm)}
.site-footer__copyright{color:rgba(245,240,230,.8)}
.site-footer__icp{font-size:12px;color:rgba(245,240,230,.4);font-family:var(--font-data)}

@media (min-width:640px){
.site-footer__inner{grid-template-columns:repeat(2,1fr)}
}

@media (min-width:768px){
.site-footer__bottom{flex-direction:row;justify-content:space-between;max-width:var(--container-w);margin:0 auto;padding:16px 32px;width:100%}
}

@media (min-width:1024px){
.site-footer{margin-left:var(--sidebar-w)}
.site-footer__inner{grid-template-columns:1.2fr .8fr .8fr 1.2fr;gap:48px}
}

/* ===== 按钮 ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 28px;font-family:var(--font-heading);font-weight:900;font-size:var(--fs-base);line-height:1.2;border:2px solid var(--color-ink);text-decoration:none;cursor:pointer;transition:transform var(--dur-fast),box-shadow var(--dur-fast),background-color var(--dur-fast),color var(--dur-fast)}
.btn--primary{background:var(--color-primary);color:#fff;box-shadow:4px 4px 0 var(--color-deep-blue)}
.btn--primary:hover{transform:translate(-2px,-2px);box-shadow:6px 6px 0 var(--color-deep-blue);color:#fff}
.btn--outline{background:transparent;color:var(--color-deep-blue);box-shadow:4px 4px 0 var(--color-deep-blue)}
.btn--outline:hover{background:var(--color-paper-light);transform:translate(-2px,-2px);box-shadow:6px 6px 0 var(--color-deep-blue);color:var(--color-deep-blue)}
.btn--gold{background:var(--color-gold);color:var(--color-ink);box-shadow:4px 4px 0 var(--color-deep-blue)}
.btn--gold:hover{transform:translate(-2px,-2px);box-shadow:6px 6px 0 var(--color-deep-blue);color:var(--color-ink)}
.btn--small{padding:8px 18px;font-size:var(--fs-sm)}

/* ===== 卡片 ===== */
.card{background:var(--color-paper-light);border:var(--border-w) solid var(--color-ink);box-shadow:var(--shadow-hard);padding:24px}
.card--bordered{border:2px solid var(--color-mid-blue);box-shadow:none;background:var(--color-paper-light)}
.card--flat{background:transparent;border:2px solid var(--color-mid-blue);box-shadow:none}

/* ===== 标签 ===== */
.tag{display:inline-block;padding:4px 12px;font-size:var(--fs-xs);font-weight:700;font-family:var(--font-heading);letter-spacing:.06em;border:2px solid var(--color-ink);background:var(--color-paper-light);color:var(--color-deep-blue);text-transform:uppercase;line-height:1.4}
.tag--orange{background:var(--color-primary);border-color:var(--color-ink);color:#fff}
.tag--blue{background:var(--color-mid-blue);border-color:var(--color-ink);color:#fff}
.tag--gold{background:var(--color-gold);border-color:var(--color-ink);color:var(--color-ink)}
.tag--danger{background:var(--color-danger);border-color:var(--color-ink);color:#fff}
.live-dot{display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--color-primary);animation:live-pulse 2.25s ease-in-out infinite}

/* ===== 数据字体 ===== */
.stat-num{font-family:var(--font-data);font-weight:700;font-size:var(--fs-huge);line-height:1;letter-spacing:-.02em;color:var(--color-deep-blue)}
.data-text{font-family:var(--font-data);font-size:var(--fs-sm)}

/* ===== 面包屑 ===== */
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:6px;font-size:var(--fs-sm);padding:16px 0}
.breadcrumb__list{display:flex;flex-wrap:wrap;gap:6px}
.breadcrumb__item{display:inline-flex;align-items:center;gap:6px}
.breadcrumb__item+.breadcrumb__item::before{content:'/';font-family:var(--font-data);color:var(--color-gray)}
.breadcrumb__link{color:var(--color-mid-blue);text-decoration:none}
.breadcrumb__link:hover{color:var(--color-primary)}
.breadcrumb__current{color:var(--color-ink);font-weight:700}

/* ===== 章节 ===== */
.section{padding:48px 0}
.section__head{display:flex;flex-direction:column;gap:8px;margin-bottom:28px}
.section__head--inline{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;flex-direction:row}
.section__tag{display:inline-block;align-self:flex-start;padding:4px 10px;background:var(--color-deep-blue);color:var(--color-paper);font-family:var(--font-data);font-size:var(--fs-xs);letter-spacing:.14em;text-transform:uppercase;clip-path:polygon(0 0,calc(100% - 8px) 0,100% 100%,8px 100%)}
.section__title{font-size:var(--fs-xxl);font-weight:900;color:var(--color-deep-blue);line-height:1.15}

/* ===== 栅格 ===== */
.grid{display:grid;gap:24px}
.grid--2{grid-template-columns:1fr}
.grid--3{grid-template-columns:1fr}
.grid--4{grid-template-columns:1fr}
@media (min-width:640px){
.grid--2{grid-template-columns:repeat(2,1fr)}
.grid--4{grid-template-columns:repeat(2,1fr)}
}
@media (min-width:1024px){
.grid--3{grid-template-columns:repeat(3,1fr)}
.grid--4{grid-template-columns:repeat(4,1fr)}
}

/* ===== 斜切分割线 ===== */
.divider{height:4px;border:none;background:var(--color-deep-blue);clip-path:polygon(0 0,100% 0,calc(100% - 48px) 100%,0 100%);margin:32px 0}

/* ===== 图片框 ===== */
.img-frame{position:relative;display:block;overflow:hidden;background:var(--color-paper-deep);border:2px solid var(--color-mid-blue);aspect-ratio:16/9}
.img-frame img{position:relative;z-index:2;width:100%;height:100%;object-fit:cover;object-position:center}
.img-frame::before{content:'';position:absolute;inset:0;z-index:1;background:repeating-linear-gradient(-45deg,transparent 0 10px,rgba(27,58,92,.06) 10px 20px);pointer-events:none}
.img-frame__placeholder{position:absolute;inset:0;z-index:1;display:flex;align-items:center;justify-content:center;font-family:var(--font-data);font-size:var(--fs-xs);color:var(--color-gray);text-transform:uppercase;letter-spacing:.1em}
.img-frame--16-9{aspect-ratio:16/9}
.img-frame--4-3{aspect-ratio:4/3}
.img-frame--1-1{aspect-ratio:1/1}
.img-frame--3-4{aspect-ratio:3/4}

/* ===== 动画 ===== */
@keyframes live-pulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.4;transform:scale(.7)}}
@keyframes fade-rise{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}
.animate-fade-rise{animation:fade-rise .5s ease-out both}

/* ===== 动效与无障碍 ===== */
@media (prefers-reduced-motion:reduce){
*,*::before,*::after{animation-duration:.01ms !important;animation-iteration-count:1 !important;transition-duration:.01ms !important;scroll-behavior:auto !important}
.scroll-progress{transition:none}
.site-header__panel{transition:none}
.nav-toggle__bar{transition:none}
.site-brand,.site-header__bar{transition:none}
}