/* ===== RESET ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{min-height:100vh;line-height:1.6;-webkit-font-smoothing:antialiased}
img{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
ul,ol{list-style:none}
button{font:inherit;border:none;background:none;cursor:pointer;color:inherit}
:focus-visible{outline:2px solid #FFD700;outline-offset:2px;border-radius:2px}

/* ===== VARIABLES ===== */
:root{
  --color-deep-space:#0B1A3B;
  --color-arena-red:#E63946;
  --color-star-gold:#FFD700;
  --color-white:#FFFFFF;
  --color-gray:#B0B0B0;
  --color-card-bg:#112240;
  --color-grid-line:#2D3B5A;
  --color-success:#2ECC71;
  --color-warning:#F39C12;
  --color-surface:#0f1d3f;
  --font-heading:'Impact','Arial Black','Helvetica Bold',sans-serif;
  --font-body:'Georgia','Times New Roman',serif;
  --font-nav:'Arial','Helvetica',sans-serif;
  --font-mono:'Courier New',monospace;
  --space-xs:4px;--space-sm:8px;--space-md:16px;--space-lg:24px;--space-xl:32px;--space-2xl:48px;--space-3xl:64px;
  --max-width:1200px;
  --header-h:72px;
  --radius-sm:4px;--radius-md:8px;--radius-lg:16px;
  --shadow-card:0 4px 20px rgba(0,0,0,0.3);
  --transition:0.25s ease;
}
@media(max-width:767px){:root{--header-h:60px;--space-2xl:32px;--space-3xl:40px}}

/* ===== TYPOGRAPHY ===== */
body{font-family:var(--font-body);font-size:16px;color:var(--color-white);background:var(--color-deep-space)}
h1,h2,h3,h4{font-family:var(--font-heading);font-weight:700;line-height:1.2;letter-spacing:0.02em}
h1{font-size:48px} h2{font-size:36px} h3{font-size:28px} h4{font-size:22px}
@media(max-width:767px){h1{font-size:32px} h2{font-size:26px} h3{font-size:22px} h4{font-size:18px}}
code,.mono{font-family:var(--font-mono)}
p{max-width:70ch;margin-bottom:1em}
small{font-size:0.85em;color:var(--color-gray)}

/* ===== LAYOUT ===== */
.content-container{max-width:var(--max-width);margin:0 auto;padding:0 var(--space-lg)}
@media(max-width:767px){.content-container{padding:0 var(--space-md)}}

.grid{display:grid;gap:var(--space-lg)}
.grid-2{grid-template-columns:1fr 1fr}
.grid-3{grid-template-columns:1fr 1fr 1fr}
@media(max-width:767px){.grid-2,.grid-3{grid-template-columns:1fr}}

/* ===== SKIP LINK ===== */
.skip-link{position:fixed;top:-100%;left:var(--space-md);z-index:10000;padding:var(--space-sm) var(--space-md);background:var(--color-star-gold);color:var(--color-deep-space);font-family:var(--font-heading);font-size:14px;font-weight:600;border-radius:0 0 var(--radius-sm) var(--radius-sm);transition:top 0.3s}
.skip-link:focus{top:0}

/* ===== HEADER ===== */
.site-header{position:fixed;top:0;left:0;right:0;z-index:9000;height:var(--header-h);background:rgba(11,26,59,0.92);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border-bottom:1px solid var(--color-grid-line);display:flex;align-items:center}
.header-inner{max-width:var(--max-width);margin:0 auto;padding:0 var(--space-lg);width:100%;display:flex;align-items:center;justify-content:space-between}
.brand{flex-shrink:0}
.brand-link{display:flex;align-items:center;gap:var(--space-sm);font-family:var(--font-heading);font-size:22px;font-weight:700;letter-spacing:0.04em;color:var(--color-star-gold);transition:opacity var(--transition)}
.brand-link:hover{opacity:0.85}
.brand-icon{font-size:28px;line-height:1;filter:drop-shadow(0 0 6px rgba(255,215,0,0.4))}
.brand-name{white-space:nowrap}
.nav-toggle{display:none;flex-direction:column;justify-content:center;align-items:center;width:44px;height:44px;gap:5px;padding:var(--space-xs);border:1px solid var(--color-grid-line);border-radius:var(--radius-sm);transition:border-color var(--transition)}
.nav-toggle-line{display:block;width:24px;height:2px;background:var(--color-white);border-radius:2px;transition:all 0.3s}
.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.main-nav{display:flex;align-items:center}
.nav-list{display:flex;gap:var(--space-xl)}
.nav-link{font-family:var(--font-nav);font-size:17px;font-weight:600;letter-spacing:0.03em;color:var(--color-white);padding:var(--space-sm) 0;position:relative;transition:color var(--transition);white-space:nowrap}
.nav-link::after{content:'';position:absolute;bottom:0;left:0;width:0;height:2px;background:var(--color-arena-red);transition:width var(--transition)}
.nav-link:hover,.nav-link:focus-visible{color:var(--color-arena-red)}
.nav-link:hover::after,.nav-link:focus-visible::after{width:100%}
.nav-link[aria-current="page"]{color:var(--color-star-gold)}
.nav-link[aria-current="page"]::after{width:100%;background:var(--color-star-gold)}
.header-gridline{position:absolute;bottom:-1px;left:10%;right:10%;height:1px;background:linear-gradient(90deg,transparent,var(--color-grid-line),var(--color-star-gold),var(--color-grid-line),transparent);opacity:0.6}

/* ===== MOBILE NAV ===== */
@media(max-width:767px){
  .nav-toggle{display:flex}
  .main-nav{position:fixed;top:var(--header-h);left:0;right:0;bottom:0;background:rgba(11,26,59,0.98);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);flex-direction:column;align-items:stretch;padding:var(--space-lg) var(--space-lg) var(--space-2xl);transform:translateY(-120%);opacity:0;transition:transform 0.4s ease,opacity 0.4s ease;overflow-y:auto}
  .main-nav[data-open]{transform:translateY(0);opacity:1}
  .nav-list{flex-direction:column;gap:var(--space-md)}
  .nav-link{font-size:20px;padding:var(--space-sm) 0;border-bottom:1px solid var(--color-grid-line)}
  .nav-link::after{display:none}
  .nav-link[aria-current="page"]{color:var(--color-star-gold);border-bottom-color:var(--color-star-gold)}
}

/* ===== FOOTER ===== */
.site-footer{background:var(--color-surface);border-top:1px solid var(--color-grid-line);position:relative;padding:var(--space-2xl) 0 var(--space-lg)}
.footer-inner{max-width:var(--max-width);margin:0 auto;padding:0 var(--space-lg);display:grid;grid-template-columns:1fr 1fr;gap:var(--space-lg) var(--space-xl)}
.footer-brand{display:flex;flex-direction:column;gap:var(--space-sm)}
.footer-brand .brand-icon{font-size:32px;color:var(--color-star-gold);filter:drop-shadow(0 0 8px rgba(255,215,0,0.3))}
.footer-brand .brand-name{font-family:var(--font-heading);font-size:24px;color:var(--color-star-gold);letter-spacing:0.04em}
.footer-tagline{font-family:var(--font-body);font-size:14px;color:var(--color-gray);font-style:italic;margin:0}
.footer-links{display:flex;flex-direction:column;align-items:flex-end;gap:var(--space-sm);justify-content:flex-start}
.footer-link{font-family:var(--font-nav);font-size:15px;font-weight:500;color:var(--color-gray);transition:color var(--transition);position:relative;padding:var(--space-xs) 0}
.footer-link:hover,.footer-link:focus-visible{color:var(--color-star-gold)}
.footer-link::before{content:'▸';color:var(--color-arena-red);margin-right:var(--space-sm);font-size:12px}
.footer-contact{grid-column:1/-1;display:flex;flex-wrap:wrap;gap:var(--space-md) var(--space-xl);padding:var(--space-md) 0;border-top:1px solid var(--color-grid-line);border-bottom:1px solid var(--color-grid-line);font-size:14px;color:var(--color-gray)}
.footer-email::before{content:'✉ ';color:var(--color-star-gold)}
.footer-phone::before{content:'☏ ';color:var(--color-arena-red)}
.footer-address{color:var(--color-gray);margin-left:auto}
.footer-address::before{content:'◈ ';color:var(--color-star-gold)}
.footer-bottom{grid-column:1/-1;display:flex;flex-wrap:wrap;align-items:center;gap:var(--space-sm) var(--space-lg);font-size:13px;color:var(--color-gray);padding-top:var(--space-md)}
.footer-icp{font-family:var(--font-mono);background:rgba(45,59,90,0.3);padding:2px var(--space-sm);border-radius:var(--radius-sm)}
.footer-note{font-size:12px;color:var(--color-gray);opacity:0.7;flex:1}
.footer-copy{margin-left:auto;white-space:nowrap}
.footer-border{position:absolute;top:-2px;left:5%;right:5%;height:2px;background:repeating-linear-gradient(90deg,var(--color-grid-line) 0,var(--color-grid-line) 12px,transparent 12px,transparent 20px);opacity:0.5}
@media(max-width:767px){
  .footer-inner{grid-template-columns:1fr;gap:var(--space-md)}
  .footer-links{align-items:flex-start}
  .footer-address{margin-left:0;width:100%}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:var(--space-sm)}
  .footer-copy{margin-left:0}
}

/* ===== BUTTONS ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-sm);padding:12px 28px;font-family:var(--font-heading);font-size:16px;font-weight:600;letter-spacing:0.03em;border-radius:var(--radius-md);transition:all var(--transition);white-space:nowrap}
.btn-primary{background:var(--color-arena-red);color:var(--color-white);box-shadow:0 2px 12px rgba(230,57,70,0.25)}
.btn-primary:hover,.btn-primary:focus-visible{background:#d62d3a;transform:translateY(-1px);box-shadow:0 4px 20px rgba(230,57,70,0.35)}
.btn-outline{border:2px solid var(--color-star-gold);color:var(--color-star-gold);background:transparent}
.btn-outline:hover,.btn-outline:focus-visible{background:var(--color-star-gold);color:var(--color-deep-space);transform:translateY(-1px)}
.btn-sm{padding:8px 18px;font-size:14px}

/* ===== BREADCRUMB ===== */
.breadcrumb{display:flex;flex-wrap:wrap;gap:var(--space-sm);font-size:14px;color:var(--color-gray);padding:var(--space-md) 0}
.breadcrumb a{color:var(--color-star-gold);transition:color var(--transition)}
.breadcrumb a:hover{color:var(--color-arena-red)}
.breadcrumb span::after{content:'/';margin-left:var(--space-sm);color:var(--color-grid-line)}
.breadcrumb span:last-child::after{display:none}
.breadcrumb span:last-child{color:var(--color-white)}

/* ===== CARD ===== */
.card{background:var(--color-card-bg);border-radius:var(--radius-lg);padding:var(--space-lg);box-shadow:var(--shadow-card);border:1px solid var(--color-grid-line);transition:border-color var(--transition),transform var(--transition)}
.card:hover{border-color:var(--color-star-gold);transform:translateY(-2px)}
.card-title{font-family:var(--font-heading);font-size:20px;color:var(--color-white);margin-bottom:var(--space-sm)}
.card-meta{font-size:13px;color:var(--color-gray);margin-bottom:var(--space-md)}

/* ===== SECTION NUMBERED ===== */
.section-numbered{display:flex;gap:var(--space-lg);align-items:baseline;margin-bottom:var(--space-xl)}
.section-numbered .num{font-family:var(--font-heading);font-size:72px;line-height:1;color:var(--color-arena-red);opacity:0.3;flex-shrink:0;font-weight:700}
.section-numbered .content{flex:1}
.section-numbered .content h2,.section-numbered .content h3{margin-bottom:var(--space-sm)}
@media(max-width:767px){.section-numbered .num{font-size:48px}}

/* ===== IMAGE CONTAINER ===== */
.image-container{position:relative;width:100%;aspect-ratio:16/9;background:var(--color-card-bg);border-radius:var(--radius-md);border:1px dashed var(--color-grid-line);display:flex;align-items:center;justify-content:center;overflow:hidden}
.image-container::after{content:'📷 图片占位';font-size:14px;color:var(--color-gray);opacity:0.5;font-family:var(--font-mono)}
.image-container.portrait{aspect-ratio:3/4}
.image-container.wide{aspect-ratio:21/9}

/* ===== PROGRESS STARLIGHT ===== */
.progress-starlight{position:fixed;top:var(--header-h);left:0;height:3px;width:0%;background:linear-gradient(90deg,var(--color-star-gold),var(--color-arena-red));z-index:8999;transition:width 0.1s linear;pointer-events:none;box-shadow:0 0 12px rgba(255,215,0,0.3)}
@media(prefers-reduced-motion:reduce){.progress-starlight{display:none}}

/* ===== RESPONSIVE ===== */
@media(min-width:768px) and (max-width:1024px){
  .nav-list{gap:var(--space-md)}
  .nav-link{font-size:15px}
  .footer-inner{gap:var(--space-md)}
}

/* ===== ACCESSIBILITY & MOTION ===== */
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{transition-duration:0.01ms!important;animation-duration:0.01ms!important;scroll-behavior:auto!important}
  .main-nav{transition:none!important}
  .nav-toggle-line{transition:none!important}
  .progress-starlight{display:none}
}

/* ===== UTILITY ===== */
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.text-center{text-align:center}
.mt-lg{margin-top:var(--space-lg)}
.mb-lg{margin-bottom:var(--space-lg)}