/* ===== RESET & BASE ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;text-size-adjust:100%}
body{min-height:100vh;line-height:1.6;font-family:'Noto Sans SC','PingFang SC','Microsoft YaHei','Helvetica Neue',Arial,sans-serif;font-size:1rem;color:#212121;background:#F5F5F5;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
ul,ol{list-style:none}
button{cursor:pointer;font-family:inherit;font-size:inherit;border:none;background:none}
input,textarea,select{font-family:inherit;font-size:inherit}
:focus-visible{outline:3px solid #D4AF37;outline-offset:2px}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:0.01ms!important;animation-iteration-count:1!important;transition-duration:0.01ms!important;scroll-behavior:auto!important}}

/* ===== CSS VARIABLES ===== */
:root{
  --color-primary:#D4AF37;
  --color-primary-light:#F9E79F;
  --color-primary-dark:#B8962A;
  --color-secondary:#1A237E;
  --color-secondary-light:#283593;
  --color-accent:#FF6F00;
  --color-accent-light:#FF8F00;
  --color-bg-dark:#0D1B2A;
  --color-bg-light:#F5F5F5;
  --color-text:#212121;
  --color-text-secondary:#757575;
  --color-text-on-dark:#FFFFFF;
  --color-border:#B0BEC5;
  --color-white:#FFFFFF;
  --font-primary:'Noto Sans SC','PingFang SC','Microsoft YaHei','Helvetica Neue',Arial,sans-serif;
  --font-secondary:'Noto Serif SC','Source Han Serif SC','STSong','Georgia',serif;
  --border-width:6px;
  --border-radius:16px;
  --shadow-strong:0 8px 24px rgba(0,0,0,0.25);
  --shadow-hover:0 12px 32px rgba(0,0,0,0.35);
  --transition-base:0.3s cubic-bezier(0.4,0,0.2,1);
  --max-width:1280px;
  --header-bg:#0D1B2A;
  --footer-bg:#1A237E;
}

/* ===== CONTAINER ===== */
.container{width:100%;max-width:var(--max-width);margin:0 auto;padding:0 24px}
@media(min-width:768px){.container{padding:0 40px}}
@media(min-width:1280px){.container{padding:0 64px}}

/* ===== SKIP LINK ===== */
.skip-link{position:absolute;top:-100%;left:16px;z-index:10000;padding:12px 24px;background:var(--color-accent);color:var(--color-white);font-weight:700;font-size:1rem;border-radius:0 0 8px 8px;transition:top 0.2s}
.skip-link:focus{top:0;outline:none}

/* ===== HEADER ===== */
.site-header{background:var(--header-bg);color:var(--color-text-on-dark);position:relative;z-index:1000;border-bottom:var(--border-width) solid var(--color-primary)}
.header-inner{max-width:var(--max-width);margin:0 auto;padding:24px 24px 16px;display:flex;flex-direction:column;align-items:center}
.brand{text-align:center;display:flex;flex-direction:column;align-items:center;gap:4px}
.brand-logo{font-size:2.4rem;font-weight:900;letter-spacing:0.08em;background:linear-gradient(135deg,#D4AF37,#F9E79F,#D4AF37);-webkit-background-clip:text;background-clip:text;color:transparent;text-shadow:none;font-family:var(--font-primary);line-height:1.2}
.brand-annotation{font-size:0.8rem;color:var(--color-primary-light);letter-spacing:0.15em;font-weight:400;opacity:0.85;font-family:var(--font-secondary)}
.header-divider{width:80px;height:3px;background:linear-gradient(90deg,transparent,var(--color-primary),transparent);margin:12px auto 14px;border-radius:2px}
.nav-toggle{display:flex;align-items:center;gap:8px;padding:10px 16px;color:var(--color-text-on-dark);background:rgba(255,255,255,0.08);border-radius:8px;position:absolute;right:20px;top:28px;transition:background var(--transition-base)}
.nav-toggle:hover,.nav-toggle:focus-visible{background:rgba(212,175,55,0.25)}
.nav-toggle-icon{width:22px;height:18px;position:relative;display:block}
.nav-toggle-icon::before,.nav-toggle-icon::after,.nav-toggle-icon span{content:'';position:absolute;left:0;width:100%;height:2.5px;background:var(--color-primary);border-radius:2px;transition:all 0.3s}
.nav-toggle-icon::before{top:0}
.nav-toggle-icon span{top:50%;transform:translateY(-50%)}
.nav-toggle-icon::after{bottom:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before{top:50%;transform:translateY(-50%) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-icon span{opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-icon::after{top:50%;transform:translateY(-50%) rotate(-45deg)}
.nav-toggle-label{font-size:0.8rem;font-weight:600;letter-spacing:0.05em;color:var(--color-primary)}
@media(min-width:768px){.nav-toggle-label{display:none}}

/* ===== NAVIGATION ===== */
.nav{width:100%;transition:all var(--transition-base)}
@media(max-width:767px){
  .nav{position:fixed;top:0;left:0;width:100vw;height:100vh;background:rgba(13,27,42,0.98);display:flex;align-items:center;justify-content:center;opacity:0;pointer-events:none;transition:opacity 0.4s;z-index:999}
  .nav[data-open]{opacity:1;pointer-events:auto}
  .nav[data-open] .nav-list{flex-direction:column;gap:12px;text-align:center}
  .nav[data-open] .nav-list a{font-size:1.6rem;padding:16px 32px;display:block}
  .nav-toggle{z-index:1001}
}
@media(min-width:768px){
  .nav-toggle{display:none}
  .nav{position:static;width:auto;height:auto;opacity:1;pointer-events:auto;background:none;display:flex;justify-content:center}
}
.nav-list{display:flex;flex-wrap:wrap;justify-content:center;gap:4px}
.nav-list a{display:block;padding:10px 20px;font-weight:600;font-size:1rem;letter-spacing:0.05em;color:var(--color-text-on-dark);border-radius:8px;transition:all var(--transition-base);position:relative;white-space:nowrap}
.nav-list a::after{content:'';position:absolute;bottom:4px;left:50%;width:0;height:2.5px;background:var(--color-primary);transform:translateX(-50%);transition:width var(--transition-base);border-radius:2px}
.nav-list a:hover{background:linear-gradient(135deg,rgba(212,175,55,0.2),rgba(249,231,159,0.1));color:var(--color-primary-light)}
.nav-list a:hover::after{width:60%}
.nav-list a[aria-current="page"]{color:var(--color-primary);font-weight:700}
.nav-list a[aria-current="page"]::after{width:60%;background:var(--color-primary)}
@media(max-width:767px){
  .nav-list a{font-size:1.2rem;padding:12px 24px}
}

/* ===== FOOTER ===== */
.site-footer{background:var(--footer-bg);color:var(--color-text-on-dark);border-top:var(--border-width) solid var(--color-primary);padding:48px 24px 24px}
.footer-inner{max-width:var(--max-width);margin:0 auto}
.footer-brand{text-align:center;margin-bottom:16px}
.footer-logo{font-size:1.8rem;font-weight:900;letter-spacing:0.08em;background:linear-gradient(135deg,#D4AF37,#F9E79F);-webkit-background-clip:text;background-clip:text;color:transparent;font-family:var(--font-primary)}
.footer-tagline{font-size:0.95rem;color:var(--color-primary-light);margin-top:4px;font-family:var(--font-secondary);letter-spacing:0.1em}
.footer-trust{font-size:0.85rem;color:rgba(255,255,255,0.7);max-width:600px;margin:12px auto 0;line-height:1.7;font-family:var(--font-secondary)}
.footer-divider{width:60px;height:2px;background:linear-gradient(90deg,transparent,var(--color-primary),transparent);margin:16px auto;border-radius:2px}
.footer-middle{display:flex;flex-direction:column;align-items:center;gap:16px;padding:8px 0}
.footer-links{display:flex;flex-wrap:wrap;justify-content:center;gap:24px}
.footer-links a{color:var(--color-primary-light);font-weight:600;font-size:0.95rem;padding:4px 0;border-bottom:2px solid transparent;transition:all var(--transition-base)}
.footer-links a:hover,.footer-links a:focus-visible{border-bottom-color:var(--color-primary);color:var(--color-primary)}
.footer-contact{display:flex;flex-wrap:wrap;justify-content:center;gap:16px 28px;font-size:0.85rem;color:rgba(255,255,255,0.75)}
.footer-contact-item{display:flex;align-items:center;gap:6px}
.footer-contact-item::before{content:'▹';color:var(--color-primary);font-size:0.8rem}
.footer-bottom{display:flex;flex-wrap:wrap;justify-content:center;align-items:center;gap:8px 24px;padding-top:12px;font-size:0.8rem;color:rgba(255,255,255,0.55);text-align:center}
.footer-copyright{font-weight:500}
.footer-icp{letter-spacing:0.05em}
.footer-service-note{width:100%;margin-top:6px;font-size:0.75rem;color:rgba(255,255,255,0.4)}
@media(min-width:768px){
  .site-footer{padding:56px 40px 28px}
  .footer-middle{flex-direction:row;justify-content:space-between;align-items:flex-start}
  .footer-links{gap:32px}
  .footer-contact{flex-direction:column;align-items:flex-end;gap:8px}
  .footer-bottom{justify-content:space-between}
  .footer-service-note{width:auto;margin-top:0}
}

/* ===== BUTTONS ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 28px;font-weight:700;font-size:1rem;border-radius:12px;border:var(--border-width) solid transparent;transition:all var(--transition-base);min-height:48px;text-align:center;line-height:1.2}
.btn-primary{background:linear-gradient(135deg,#D4AF37,#F9E79F);color:#0D1B2A;border-color:#D4AF37;box-shadow:0 4px 16px rgba(212,175,55,0.3)}
.btn-primary:hover{background:linear-gradient(135deg,#F9E79F,#D4AF37);box-shadow:0 6px 24px rgba(212,175,55,0.45);transform:translateY(-2px)}
.btn-accent{background:var(--color-accent);color:var(--color-white);border-color:var(--color-accent);box-shadow:0 4px 16px rgba(255,111,0,0.3)}
.btn-accent:hover{background:var(--color-accent-light);box-shadow:0 6px 24px rgba(255,111,0,0.45);transform:translateY(-2px)}
.btn-outline{background:transparent;color:var(--color-primary);border-color:var(--color-primary)}
.btn-outline:hover{background:rgba(212,175,55,0.12)}

/* ===== CARDS ===== */
.card{background:var(--color-white);border:var(--border-width) solid var(--color-border);border-radius:var(--border-radius);box-shadow:var(--shadow-strong);padding:24px;transition:all var(--transition-base)}
.card:hover{box-shadow:var(--shadow-hover);transform:translateY(-4px)}
.card--highlight{border-color:var(--color-primary);box-shadow:0 8px 24px rgba(212,175,55,0.2)}
.card--highlight:hover{border-color:var(--color-accent);box-shadow:0 12px 32px rgba(212,175,55,0.3)}

/* ===== SECTION NUMBERING ===== */
.section-number{font-size:4rem;font-weight:900;line-height:1;font-family:var(--font-primary);background:linear-gradient(135deg,#D4AF37,#F9E79F);-webkit-background-clip:text;background-clip:text;color:transparent;margin-bottom:4px;letter-spacing:-0.03em}
.section-title{font-size:1.75rem;font-weight:700;color:var(--color-text);font-family:var(--font-primary);line-height:1.3}
.section-subtitle{font-size:0.95rem;color:var(--color-text-secondary);font-family:var(--font-secondary);font-weight:400;margin-top:4px}

/* ===== GRID SYSTEM ===== */
.grid{display:grid;grid-template-columns:repeat(12,1fr);gap:24px}
.grid--gap-sm{gap:16px}
.grid--gap-lg{gap:32px}
.col-1{grid-column:span 1}.col-2{grid-column:span 2}.col-3{grid-column:span 3}.col-4{grid-column:span 4}
.col-5{grid-column:span 5}.col-6{grid-column:span 6}.col-7{grid-column:span 7}.col-8{grid-column:span 8}
.col-9{grid-column:span 9}.col-10{grid-column:span 10}.col-11{grid-column:span 11}.col-12{grid-column:span 12}
@media(max-width:767px){
  .grid{grid-template-columns:repeat(4,1fr);gap:16px}
  .col-1,.col-2,.col-3,.col-4,.col-5,.col-6,.col-7,.col-8,.col-9,.col-10,.col-11,.col-12{grid-column:span 4}
}
@media(min-width:768px)and (max-width:1023px){
  .grid{grid-template-columns:repeat(8,1fr);gap:20px}
  .col-1,.col-2,.col-3{grid-column:span 2}
  .col-4,.col-5{grid-column:span 4}
  .col-6,.col-7,.col-8,.col-9,.col-10,.col-11,.col-12{grid-column:span 8}
}

/* ===== BENTO GRID ===== */
.bento-grid{display:grid;grid-template-columns:repeat(12,1fr);gap:20px;grid-auto-flow:dense}
.bento-item{border:var(--border-width) solid var(--color-border);border-radius:var(--border-radius);box-shadow:var(--shadow-strong);overflow:hidden;background:var(--color-white);transition:all var(--transition-base);padding:20px}
.bento-item:hover{box-shadow:var(--shadow-hover);transform:translateY(-3px)}
.bento-item--wide{grid-column:span 6}
.bento-item--tall{grid-row:span 2}
.bento-item--focus{grid-column:span 8;grid-row:span 2;border-color:var(--color-primary);background:linear-gradient(135deg,#0D1B2A,#1A237E);color:var(--color-text-on-dark)}
@media(max-width:767px){
  .bento-grid{grid-template-columns:repeat(4,1fr);gap:12px}
  .bento-item,.bento-item--wide,.bento-item--focus{grid-column:span 4}
  .bento-item--tall{grid-row:span 1}
}
@media(min-width:768px)and (max-width:1023px){
  .bento-grid{grid-template-columns:repeat(8,1fr);gap:16px}
  .bento-item--wide{grid-column:span 4}
  .bento-item--focus{grid-column:span 8}
}

/* ===== SPLIT SCREEN (基础) ===== */
.split-screen{display:flex;flex-direction:column;min-height:60vh}
.split-screen__panel{padding:48px 24px;display:flex;flex-direction:column;justify-content:center}
.split-screen__panel--dark{background:var(--color-bg-dark);color:var(--color-text-on-dark)}
.split-screen__panel--accent{background:var(--color-secondary);color:var(--color-text-on-dark)}
.split-screen__panel--light{background:var(--color-bg-light);color:var(--color-text)}
@media(min-width:768px){
  .split-screen{flex-direction:row}
  .split-screen__panel{flex:1;padding:64px 48px}
}

/* ===== SCROLL PROGRESS ===== */
[data-scroll-progress]{position:fixed;top:0;left:0;width:0%;height:4px;background:linear-gradient(90deg,var(--color-primary),var(--color-accent));z-index:10000;transition:width 0.1s linear;box-shadow:0 2px 8px rgba(212,175,55,0.4)}

/* ===== TAB SYSTEM ===== */
[data-tab-group]{width:100%}
[data-tab-list]{display:flex;flex-wrap:wrap;gap:8px;border-bottom:3px solid var(--color-border);padding-bottom:8px;margin-bottom:24px}
[data-tab-trigger]{padding:10px 24px;font-weight:600;font-size:0.95rem;border-radius:8px 8px 0 0;background:transparent;color:var(--color-text-secondary);border:2px solid transparent;border-bottom:none;transition:all var(--transition-base);cursor:pointer}
[data-tab-trigger]:hover{color:var(--color-primary);background:rgba(212,175,55,0.08)}
[data-tab-trigger][aria-selected="true"]{color:var(--color-primary);background:var(--color-white);border-color:var(--color-border);border-bottom-color:var(--color-white);font-weight:700;position:relative;top:3px}
[data-tab-panel]{display:none;padding:8px 0}
[data-tab-panel][data-active]{display:block}
@media(prefers-reduced-motion:reduce){
  [data-tab-panel]{transition:none}
}

/* ===== ACCORDION (基础) ===== */
[data-accordion-item]{border-bottom:2px solid var(--color-border)}
[data-accordion-trigger]{width:100%;display:flex;justify-content:space-between;align-items:center;padding:16px 0;font-weight:600;font-size:1.05rem;color:var(--color-text);background:none;text-align:left;transition:color var(--transition-base)}
[data-accordion-trigger]:hover{color:var(--color-primary)}
[data-accordion-trigger]::after{content:'+';font-size:1.4rem;color:var(--color-primary);transition:transform 0.3s;font-weight:700}
[data-accordion-trigger][aria-expanded="true"]::after{content:'−'}
[data-accordion-panel]{overflow:hidden;max-height:0;transition:max-height 0.4s ease;padding:0 8px}
[data-accordion-panel][data-open]{max-height:600px;padding:0 8px 16px}
@media(prefers-reduced-motion:reduce){
  [data-accordion-panel]{transition:none}
}

/* ===== BREADCRUMB ===== */
.breadcrumb{display:flex;flex-wrap:wrap;gap:8px 16px;padding:16px 0;font-size:0.85rem;color:var(--color-text-secondary)}
.breadcrumb a{color:var(--color-secondary);font-weight:500;transition:color var(--transition-base)}
.breadcrumb a:hover{color:var(--color-primary)}
.breadcrumb span[aria-current="page"]{color:var(--color-text);font-weight:600}
.breadcrumb li{display:flex;align-items:center;gap:8px}
.breadcrumb li+li::before{content:'/';color:var(--color-border);font-weight:300}

/* ===== UTILITY ===== */
.text-gold{color:var(--color-primary)}
.text-accent{color:var(--color-accent)}
.text-center{text-align:center}
.mt-1{margin-top:8px}.mt-2{margin-top:16px}.mt-3{margin-top:24px}.mt-4{margin-top:32px}.mt-5{margin-top:48px}
.mb-1{margin-bottom:8px}.mb-2{margin-bottom:16px}.mb-3{margin-bottom:24px}.mb-4{margin-bottom:32px}.mb-5{margin-bottom:48px}
.p-1{padding:8px}.p-2{padding:16px}.p-3{padding:24px}.p-4{padding:32px}.p-5{padding:48px}

/* ===== RESPONSIVE IMAGE CONTAINER (基础规则) ===== */
.img-container{position:relative;overflow:hidden;border-radius:12px;background:var(--color-bg-dark)}
.img-container::before{content:'';display:block;padding-top:56.25%}
.img-container img{position:absolute;top:0;left:0;width:100%;height:100%;object-fit:cover}
.img-container--portrait::before{padding-top:133.33%}
.img-container--square::before{padding-top:100%}
.img-container--hero::before{padding-top:42%}
@media(min-width:768px){.img-container--hero::before{padding-top:56.25%}}

/* ===== VISUALLY HIDDEN (可访问隐藏) ===== */
.visually-hidden:not(:focus):not(:active){position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}