/* ===== RESET & BASE ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px;-webkit-text-size-adjust:100%}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",sans-serif;font-weight:400;line-height:1.6;color:#1A1A1A;background:#F2F2F2;min-height:100vh}
img{max-width:100%;display:block;height:auto}
a{color:inherit;text-decoration:none}
ul,ol{list-style:none}
button{cursor:pointer;border:none;background:none;font:inherit;color:inherit}
:focus-visible{outline:3px solid #FF6600;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:#0044CC;
  --color-primary-dark:#002266;
  --color-secondary:#FF6600;
  --color-accent:#00FF88;
  --color-neutral-dark:#1A1A1A;
  --color-neutral-light:#F2F2F2;
  --color-white:#FFFFFF;
  --gradient-primary:linear-gradient(135deg,#0044CC,#002266);
  --gradient-secondary:radial-gradient(ellipse at center,#FF6600,#FF3300);
  --font-head-weight:900;
  --font-body-weight:400;
  --container-max:1200px;
  --header-top-h:52px;
  --header-nav-h:48px;
  --header-total:100px;
  --shadow-card:0 4px 16px rgba(0,0,0,0.08);
  --radius-card:8px;
  --slant-offset:8px;
  --transition-fast:0.2s ease;
  --transition-med:0.35s ease;
}

/* ===== SKIP LINK ===== */
.skip-link{position:absolute;top:-100px;left:16px;z-index:9999;background:#FF6600;color:#fff;padding:8px 20px;border-radius:0 0 6px 6px;font-weight:700;font-size:14px;transition:top var(--transition-fast)}
.skip-link:focus{top:0;outline:none}

/* ===== HEADER ===== */
.site-header{position:sticky;top:0;z-index:1000;background:var(--color-primary);color:var(--color-white);box-shadow:0 2px 12px rgba(0,0,0,0.15)}
.header-top{display:flex;align-items:center;justify-content:space-between;height:var(--header-top-h);padding:0 24px;background:var(--color-primary-dark)}
.brand-name{font-weight:var(--font-head-weight);font-size:22px;letter-spacing:1px;text-transform:uppercase}
.header-contact .contact-email{font-size:14px;opacity:0.9;display:none}
.nav-toggle{display:flex;flex-direction:column;justify-content:center;align-items:center;width:44px;height:44px;gap:5px;border-radius:4px;transition:background var(--transition-fast)}
.nav-toggle:hover{background:rgba(255,255,255,0.12)}
.hamburger-line{display:block;width:26px;height:3px;background:var(--color-white);border-radius:2px;transition:transform var(--transition-med),opacity var(--transition-med)}
[data-nav-toggle][aria-expanded="true"] .hamburger-line:nth-child(1){transform:translateY(8px) rotate(45deg)}
[data-nav-toggle][aria-expanded="true"] .hamburger-line:nth-child(2){opacity:0}
[data-nav-toggle][aria-expanded="true"] .hamburger-line:nth-child(3){transform:translateY(-8px) rotate(-45deg)}

.header-nav-wrap{background:var(--color-primary);position:relative}
.header-nav{max-height:0;overflow:hidden;transition:max-height var(--transition-med)}
.header-nav[data-open]{max-height:500px}
.nav-list{display:flex;flex-direction:column;padding:8px 16px 16px;gap:8px}
.nav-item{position:relative}
.nav-link{display:block;position:relative;padding:10px 20px 10px 24px;font-weight:700;font-size:15px;color:var(--color-white);z-index:1;transition:color var(--transition-fast),transform var(--transition-fast);border-radius:0}
.nav-link::before{content:"";position:absolute;inset:0;background:var(--color-primary-dark);clip-path:polygon(6px 0,100% 0,calc(100% - 6px) 100%,0 100%);z-index:-1;transition:background var(--transition-fast),clip-path var(--transition-fast)}
.nav-link:hover::before{background:var(--color-secondary);clip-path:polygon(0 0,100% 0,100% 100%,6px 100%)}
.nav-link[aria-current="page"]{color:var(--color-white)}
.nav-link[aria-current="page"]::before{background:var(--color-secondary);clip-path:polygon(0 0,100% 0,100% 100%,6px 100%)}

.nav-slant-line{display:none;height:4px;background:var(--color-accent);clip-path:polygon(0 0,100% 0,98% 100%,2% 100%);margin-top:-2px}

/* ===== FOOTER ===== */
.site-footer{background:var(--color-neutral-dark);color:var(--color-white);padding:40px 24px 32px;font-size:13px;line-height:1.8}
.footer-content{max-width:var(--container-max);margin:0 auto}
.footer-brand{margin-bottom:16px}
.footer-brand-name{font-weight:var(--font-head-weight);font-size:20px;color:var(--color-primary);background:var(--color-white);display:inline-block;padding:2px 14px;border-radius:2px;letter-spacing:1px}
.footer-info{margin-bottom:16px;border-bottom:2px solid var(--color-accent);padding-bottom:16px}
.footer-info-line{margin-bottom:4px;opacity:0.88}
.footer-info a.footer-link{color:var(--color-accent);text-decoration:underline}
.footer-info a.footer-link:hover{color:var(--color-secondary)}
.footer-nav{display:flex;flex-wrap:wrap;align-items:center;gap:6px 12px;margin-bottom:16px}
.footer-nav-link{color:var(--color-white);opacity:0.85;transition:color var(--transition-fast),opacity var(--transition-fast);font-weight:600}
.footer-nav-link:hover{color:var(--color-accent);opacity:1}
.footer-divider{opacity:0.3;font-size:14px}
.footer-trust{border-top:1px solid rgba(255,255,255,0.08);padding-top:16px}
.footer-trust-text{opacity:0.6;font-size:12px;line-height:1.7;max-width:720px}

/* ===== CONTAINER & LAYOUT ===== */
.container{max-width:var(--container-max);margin:0 auto;padding:0 24px}
.section{padding:60px 0}

/* ===== SPLIT LAYOUT ===== */
.split-layout{display:flex;flex-direction:column;gap:32px}
.split-panel{flex:1}
@media(min-width:768px){.split-layout{flex-direction:row;align-items:stretch}.split-panel{width:50%}}

/* ===== SLANT HERO ===== */
.slant-hero{position:relative;padding:80px 24px;background:var(--gradient-primary);clip-path:polygon(0 0,100% 0,100% 88%,0 96%);color:var(--color-white);overflow:hidden}
.slant-hero::after{content:"";position:absolute;top:0;right:0;width:40%;height:100%;background:var(--gradient-secondary);clip-path:polygon(30% 0,100% 0,100% 100%,0 100%);opacity:0.25;pointer-events:none}
@media(min-width:768px){.slant-hero{padding:120px 48px;clip-path:polygon(0 0,100% 0,100% 85%,0 94%)}}

/* ===== BUTTONS ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;padding:12px 32px;font-weight:700;font-size:16px;border-radius:4px;transition:transform var(--transition-fast),box-shadow var(--transition-fast);position:relative;overflow:hidden}
.btn:hover{transform:scale(1.05)}
.btn:active{transform:scale(0.97)}
.btn-primary{background:var(--color-primary);color:var(--color-white);box-shadow:0 4px 12px rgba(0,68,204,0.35)}
.btn-primary:hover{box-shadow:0 6px 20px rgba(0,68,204,0.5)}
.btn-secondary{background:var(--color-secondary);color:var(--color-white);box-shadow:0 4px 12px rgba(255,102,0,0.35)}
.btn-secondary:hover{box-shadow:0 6px 20px rgba(255,102,0,0.5)}
.btn-sm{padding:8px 20px;font-size:14px}
.btn-lg{padding:16px 44px;font-size:18px}

/* ===== CARDS ===== */
.card{background:var(--color-white);border-radius:var(--radius-card);box-shadow:var(--shadow-card);padding:24px;position:relative;transition:transform var(--transition-med),box-shadow var(--transition-med)}
.card:hover{transform:translateY(-4px);box-shadow:0 8px 32px rgba(0,0,0,0.12)}
.card::before{content:"";position:absolute;top:0;left:0;width:100%;height:4px;background:var(--gradient-primary);clip-path:polygon(0 0,100% 0,98% 100%,2% 100%)}
.card-accent::before{background:var(--gradient-secondary)}

/* ===== PROGRESS BAR ===== */
.progress-bar{width:100%;height:8px;background:var(--color-neutral-light);border-radius:4px;overflow:hidden;position:relative}
.progress-fill{height:100%;background:var(--color-accent);border-radius:4px;transition:width 0.5s ease;width:0%}

/* ===== BADGE & TAG ===== */
.badge{display:inline-block;padding:2px 12px;font-size:12px;font-weight:700;border-radius:12px;background:var(--color-primary);color:var(--color-white)}
.badge-accent{background:var(--color-secondary)}
.badge-accent1{background:var(--color-accent);color:var(--color-neutral-dark)}
.tag{display:inline-block;padding:4px 14px;font-size:13px;font-weight:600;border-radius:3px;background:var(--color-neutral-light);color:var(--color-neutral-dark);border:1px solid transparent;transition:all var(--transition-fast)}
.tag:hover{border-color:var(--color-primary);color:var(--color-primary)}

/* ===== BREADCRUMB ===== */
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:6px 10px;font-size:14px;color:#666;padding:12px 0;margin-bottom:24px}
.breadcrumb a{color:var(--color-primary);font-weight:600;transition:color var(--transition-fast)}
.breadcrumb a:hover{color:var(--color-secondary)}
.breadcrumb .breadcrumb-sep{color:#aaa;font-size:12px}

/* ===== DATA DISPLAY ===== */
.data-display{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.data-item{padding:12px 16px;background:var(--color-neutral-light);border-radius:6px;border-left:4px solid var(--color-primary)}
.data-item .data-label{font-size:12px;text-transform:uppercase;opacity:0.7;font-weight:600}
.data-item .data-value{font-size:24px;font-weight:var(--font-head-weight);color:var(--color-primary)}
@media(min-width:768px){.data-display{grid-template-columns:repeat(4,1fr)}}

/* ===== SCROLL PROGRESS ===== */
.scroll-progress{position:fixed;top:0;left:0;width:100%;height:4px;z-index:9999;background:transparent;pointer-events:none}
.scroll-progress .scroll-progress-fill{height:100%;background:var(--color-accent);width:0%;transition:width 0.1s linear;border-radius:0 2px 2px 0}

/* ===== RESPONSIVE ===== */
@media(min-width:768px){
  .header-contact .contact-email{display:inline}
  .nav-toggle{display:none}
  .header-nav{max-height:none!important;overflow:visible}
  .nav-list{flex-direction:row;padding:0 24px;gap:4px;align-items:stretch;height:var(--header-nav-h)}
  .nav-item{display:flex;align-items:stretch}
  .nav-link{display:flex;align-items:center;padding:0 20px;font-size:14px;white-space:nowrap}
  .nav-link::before{clip-path:polygon(4px 0,100% 0,calc(100% - 4px) 100%,0 100%)}
  .nav-slant-line{display:block}
  .site-header{height:var(--header-total)}
}

@media(min-width:1200px){
  .header-top{padding:0 48px}
  .nav-list{padding:0 48px;gap:10px}
  .nav-link{font-size:15px;padding:0 26px}
  .brand-name{font-size:26px}
  .footer-content{display:grid;grid-template-columns:1fr 2fr 1fr;gap:32px;align-items:start}
  .footer-brand{margin-bottom:0}
  .footer-nav{justify-content:flex-end;margin-bottom:0}
  .footer-trust{grid-column:1/-1}
}

@media(max-width:767px){
  .header-top{padding:0 16px}
  .brand-name{font-size:18px}
  .slant-hero{padding:48px 16px;clip-path:polygon(0 0,100% 0,100% 92%,0 98%)}
  .container{padding:0 16px}
  .section{padding:36px 0}
  .card{padding:16px}
  .btn{padding:10px 24px;font-size:14px}
  .data-display{grid-template-columns:1fr 1fr;gap:10px}
  .data-item .data-value{font-size:20px}
  .site-footer{padding:28px 16px 24px}
  .footer-nav{gap:4px 10px}
}

@media(max-width:374px){
  .brand-name{font-size:16px}
  .nav-link{font-size:13px;padding:8px 14px}
  .btn{padding:8px 18px;font-size:13px}
}

/* ===== ACCESSIBILITY HELPERS ===== */
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}
@media(prefers-reduced-motion:reduce){.card:hover{transform:none}.btn:hover{transform:none}}