/* ===== 1. Reset & Base ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{font-family:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;background:#1F1B4D;color:#F2F0FF;line-height:1.7;min-height:100vh;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;overflow-x:hidden}
img,svg,video{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
ul,ol{list-style:none}
button,input,select,textarea{font:inherit;color:inherit}
button{border:none;background:none;cursor:pointer}
main{display:block}
h1,h2,h3,h4,h5,h6{font-family:"Montserrat","Noto Sans SC","PingFang SC",sans-serif;font-weight:900;line-height:1.25;color:#F2F0FF;margin-bottom:.5em}
p{margin-bottom:1em}
::selection{background:#FF6B35;color:#1F1B4D}
#main-content{scroll-margin-top:24px;outline:none}

/* ===== 2. Variables ===== */
:root{
--primary:#1F1B4D;
--primary-light:#2A2463;
--primary-dark:#15122E;
--accent-orange:#FF6B35;
--accent-gold:#FFC94C;
--text-light:#F2F0FF;
--text-dim:#B8B3D9;
--success:#3DD68C;
--warning:#FFB347;
--surface-alt:#F4F3FF;
--font-head:"Montserrat","Noto Sans SC","PingFang SC",sans-serif;
--font-body:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
--font-mono:"JetBrains Mono","SF Mono",Consolas,monospace;
--radius-sm:6px;
--radius:12px;
--radius-lg:24px;
--cut:12px;
--container:1200px;
--duration:.3s;
--ease:cubic-bezier(.4,0,.2,1);
--shadow:0 8px 32px rgba(0,0,0,.35);
--shadow-soft:0 4px 16px rgba(0,0,0,.22)
}

/* ===== 3. Typography Utilities ===== */
.mono{font-family:"JetBrains Mono","SF Mono",Consolas,monospace;letter-spacing:.02em}
.text-dim{color:#B8B3D9}

/* ===== 4. Layout ===== */
.container{width:100%;max-width:1200px;margin-inline:auto;padding-inline:24px}
.container-wide{width:100%;max-width:1440px;margin-inline:auto;padding-inline:24px}
.content-wrap{max-width:760px;margin-inline:auto}

/* ===== 5. Skip Link ===== */
.skip-link{position:fixed;top:-100px;left:16px;z-index:2000;padding:10px 20px;background:#FFC94C;color:#15122E;font-weight:700;border-radius:0 0 8px 8px;transition:top .25s ease;font-size:14px}
.skip-link:focus{top:0}

/* ===== 6. Header ===== */
.site-header{position:sticky;top:0;z-index:1000;background:#1F1B4D;transition:background var(--duration) var(--ease),box-shadow var(--duration) var(--ease)}
.site-header.is-scrolled{background:rgba(31,27,77,.92);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);box-shadow:0 8px 30px rgba(0,0,0,.25)}

.top-bar{background:#15122E;border-bottom:1px solid rgba(255,201,76,.1);font-family:"JetBrains Mono","SF Mono",Consolas,monospace;font-size:12px;color:#B8B3D9}
.top-bar-inner{display:flex;align-items:center;justify-content:center;gap:12px;max-width:1200px;margin-inline:auto;padding:6px 24px}
.top-bar-badge{display:inline-flex;align-items:center;gap:8px;color:#FFC94C;font-weight:600;white-space:nowrap}
.pulse-dot{width:6px;height:6px;border-radius:50%;background:#3DD68C;box-shadow:0 0 0 0 rgba(61,214,140,.5);animation:pulse 2s infinite;flex-shrink:0}
.top-bar-sep{width:1px;height:12px;background:rgba(255,255,255,.12);flex-shrink:0}
.top-bar-note{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

.nav-wrap{padding:12px 24px}
.nav-island{display:flex;align-items:center;gap:12px;max-width:1160px;margin-inline:auto;padding:8px 8px 8px 10px;background:rgba(42,36,99,.72);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);border:1px solid rgba(255,201,76,.12);border-top-color:rgba(255,201,76,.28);border-radius:999px;box-shadow:0 4px 16px rgba(0,0,0,.22)}

.brand{display:inline-flex;align-items:center;gap:10px;flex-shrink:0}
.brand-mark{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;background:linear-gradient(135deg,#FF6B35,#FF9066);color:#15122E;font-family:"Montserrat","Noto Sans SC","PingFang SC",sans-serif;font-weight:900;font-size:16px;clip-path:polygon(0 0,calc(100% - 8px) 0,100% 8px,100% 100%,8px 100%,0 calc(100% - 8px));box-shadow:0 2px 12px rgba(255,107,53,.35)}
.brand-text{font-family:"Montserrat","Noto Sans SC","PingFang SC",sans-serif;font-weight:900;font-size:17px;letter-spacing:.03em;color:#F2F0FF;white-space:nowrap}

.site-nav{display:flex;align-items:center;gap:2px;margin-inline:auto}
.site-nav a{position:relative;display:inline-block;padding:8px 10px;font-size:14px;font-weight:500;color:#B8B3D9;border-radius:6px;transition:color var(--duration) var(--ease);white-space:nowrap}
.site-nav a::after{content:"";position:absolute;left:10px;right:10px;bottom:4px;height:2px;border-radius:2px;background:linear-gradient(90deg,#FF6B35,#FFC94C);transform:scaleX(0);transform-origin:left;transition:transform var(--duration) var(--ease)}
.site-nav a:hover{color:#F2F0FF}
.site-nav a:hover::after{transform:scaleX(1)}
.site-nav a[aria-current="page"]{color:#FFC94C}
.site-nav a[aria-current="page"]::after{transform:scaleX(1)}

.btn-cta{display:inline-flex;align-items:center;justify-content:center;padding:10px 22px;border-radius:999px;background:linear-gradient(135deg,#FF6B35,#FF9066);color:#15122E;font-weight:700;font-size:14px;box-shadow:0 4px 16px rgba(255,107,53,.35);transition:transform var(--duration) var(--ease),box-shadow var(--duration) var(--ease);white-space:nowrap;position:relative;overflow:hidden}
.btn-cta::before{content:"";position:absolute;top:0;left:-60%;width:40%;height:100%;background:linear-gradient(105deg,transparent,rgba(255,255,255,.35),transparent);transform:skewX(-20deg);transition:left .6s ease}
.btn-cta:hover{transform:translateY(-2px);box-shadow:0 6px 24px rgba(255,107,53,.5)}
.btn-cta:hover::before{left:130%}

.nav-toggle{display:none;position:relative;width:40px;height:40px;border-radius:50%;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.1);transition:background var(--duration) var(--ease);flex-shrink:0}
.nav-toggle:hover{background:rgba(255,255,255,.12)}
.nav-toggle-line{position:absolute;top:50%;left:50%;width:16px;height:2px;margin-left:-8px;margin-top:-1px;background:#F2F0FF;border-radius:2px;transition:transform var(--duration) var(--ease),opacity var(--duration) var(--ease)}
.nav-toggle-line:nth-child(1){transform:translateY(-6px)}
.nav-toggle-line:nth-child(2){transform:translateY(0)}
.nav-toggle-line:nth-child(3){transform:translateY(6px)}
.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(1){transform:translateY(0) 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(0) rotate(-45deg)}

@media (max-width:991px){
.nav-wrap{padding:8px 16px}
.nav-island{flex-wrap:wrap;border-radius:18px;padding:8px}
.nav-toggle{display:inline-flex;margin-left:auto}
.site-nav{display:none;width:100%;flex-direction:column;align-items:stretch;gap:2px;margin-inline:0;background:rgba(21,18,46,.6);border-radius:14px;padding:8px}
.site-nav[data-open="true"]{display:flex}
.site-nav a{display:block;padding:10px 14px}
.site-nav a::after{display:none}
.site-nav a:hover{background:rgba(255,255,255,.06)}
.site-nav a[aria-current="page"]{background:rgba(255,201,76,.1)}
.top-bar-inner{justify-content:center;padding-inline:16px}
.top-bar-note{display:none}
}

@media (max-width:480px){
.brand-text{font-size:15px}
.btn-cta{padding:8px 14px;font-size:13px}
.nav-island{gap:6px}
.top-bar-badge{font-size:11px}
}

/* ===== 7. Buttons ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 24px;border-radius:10px;font-family:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;font-weight:700;font-size:15px;line-height:1.2;transition:transform var(--duration) var(--ease),box-shadow var(--duration) var(--ease),background var(--duration) var(--ease),border-color var(--duration) var(--ease)}
.btn-primary{background:linear-gradient(135deg,#FF6B35,#FF9066);color:#15122E;box-shadow:0 4px 16px rgba(255,107,53,.35)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 24px rgba(255,107,53,.5)}
.btn-ghost{border:1px solid rgba(255,255,255,.15);color:#F2F0FF;background:rgba(255,255,255,.03)}
.btn-ghost:hover{border-color:rgba(255,201,76,.4);color:#FFC94C}
.btn-sm{padding:8px 16px;font-size:13px;border-radius:8px}

/* ===== 8. Cards & Panels ===== */
.card{background:#2A2463;border-radius:12px;padding:28px;box-shadow:0 4px 16px rgba(0,0,0,.22);border:1px solid rgba(255,255,255,.04)}
.card-light{background:#F4F3FF;color:#1F1B4D;border-radius:12px;padding:28px}
.card-light h1,.card-light h2,.card-light h3,.card-light h4{color:#1F1B4D}
.card-light .text-dim{color:rgba(31,27,77,.6)}
.panel-cut{background:#2A2463;padding:28px;border-radius:12px;box-shadow:0 4px 16px rgba(0,0,0,.22);clip-path:polygon(0 12px,12px 0,calc(100% - 12px) 0,100% 12px,100% calc(100% - 12px),calc(100% - 12px) 100%,12px 100%,0 calc(100% - 12px))}

/* ===== 9. Tags ===== */
.tag{display:inline-flex;align-items:center;gap:6px;padding:4px 12px;border-radius:999px;font-size:12px;font-weight:600;line-height:1.4;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.08)}
.tag-gold{background:rgba(255,201,76,.12);border-color:rgba(255,201,76,.2);color:#FFC94C}
.tag-orange{background:rgba(255,107,53,.12);border-color:rgba(255,107,53,.2);color:#FF6B35}
.tag-success{background:rgba(61,214,140,.12);border-color:rgba(61,214,140,.2);color:#3DD68C}

/* ===== 10. Sections & Chapters ===== */
.section-kicker{display:block;font-family:"JetBrains Mono","SF Mono",Consolas,monospace;font-size:12px;color:#FFC94C;letter-spacing:.15em;text-transform:uppercase;margin-bottom:8px}
.section-title{font-size:clamp(28px,4vw,42px);margin-bottom:16px}
.chapter{display:grid;grid-template-columns:72px 1fr;gap:20px;margin-bottom:24px}
.chapter-num{font-family:"JetBrains Mono","SF Mono",Consolas,monospace;font-size:48px;font-weight:700;line-height:1;color:#FFC94C}
.chapter-body{padding-top:4px}
.divider-glow{height:2px;border:none;background:linear-gradient(90deg,transparent,rgba(255,201,76,.4),rgba(255,107,53,.4),transparent);margin:40px 0}

/* ===== 11. Breadcrumbs ===== */
.breadcrumbs{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-family:"JetBrains Mono","SF Mono",Consolas,monospace;font-size:12px;color:#B8B3D9;padding:12px 0}
.breadcrumbs a{color:#B8B3D9;transition:color var(--duration) var(--ease)}
.breadcrumbs a:hover{color:#FFC94C}
.breadcrumbs-sep{color:rgba(255,255,255,.25)}

/* ===== 12. Image Frames ===== */
.img-frame{position:relative;overflow:hidden;border-radius:12px;background:#2A2463;isolation:isolate}
.img-frame::before{content:"";position:absolute;inset:0;z-index:-1;background:linear-gradient(135deg,rgba(255,107,53,.08),rgba(255,201,76,.04) 60%,rgba(42,36,99,.15))}
.img-frame img{width:100%;height:100%;object-fit:cover;transition:transform .5s var(--ease)}
.img-frame:hover img{transform:scale(1.03)}
.img-frame .img-placeholder{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;color:#B8B3D9;font-family:"JetBrains Mono","SF Mono",Consolas,monospace;font-size:12px;background:repeating-linear-gradient(45deg,rgba(255,255,255,.02) 0 2px,transparent 2px 8px)}
.img-frame.ratio-16x9{aspect-ratio:16/9}
.img-frame.ratio-4x3{aspect-ratio:4/3}
.img-frame.ratio-1x1{aspect-ratio:1}

/* ===== 13. Reveal ===== */
html.js [data-reveal]{opacity:0;transform:translateY(24px);transition:opacity .6s var(--ease),transform .6s var(--ease)}
html.js [data-reveal="left"]{transform:translateX(-24px)}
html.js [data-reveal="right"]{transform:translateX(24px)}
html.js [data-reveal].is-visible{opacity:1;transform:translateY(0)}

/* ===== 14. Footer ===== */
.site-footer{position:relative;background:#15122E;padding-top:56px;overflow:hidden}
.site-footer::before{content:"";position:absolute;top:0;left:0;right:0;height:2px;background:linear-gradient(90deg,#FF6B35,#FFC94C 50%,transparent)}
.site-footer::after{content:"";position:absolute;bottom:-120px;right:-60px;width:320px;height:320px;border-radius:50%;background:radial-gradient(circle,rgba(255,107,53,.08),transparent 65%);pointer-events:none}
.site-footer p{margin-bottom:0}
.footer-grid{display:grid;grid-template-columns:1.4fr .8fr 1.2fr;gap:48px;padding-bottom:40px;position:relative;z-index:1}
.footer-brand .brand{margin-bottom:16px}
.footer-tagline{display:inline-block;font-family:"JetBrains Mono","SF Mono",Consolas,monospace;font-size:12px;color:#FFC94C;letter-spacing:.08em;border:1px solid rgba(255,201,76,.25);padding:3px 10px;border-radius:999px;margin-bottom:16px}
.footer-desc{font-size:13px;color:#B8B3D9;line-height:1.7;max-width:360px;padding-left:14px;border-left:2px solid rgba(255,107,53,.3)}
.footer-title{font-family:"Montserrat","Noto Sans SC","PingFang SC",sans-serif;font-size:14px;font-weight:900;color:#F2F0FF;letter-spacing:.05em;margin-bottom:16px;text-transform:uppercase;position:relative;padding-bottom:8px}
.footer-title::after{content:"";position:absolute;left:0;bottom:0;width:32px;height:2px;background:linear-gradient(90deg,#FF6B35,#FFC94C);border-radius:2px}
.footer-links{display:flex;flex-direction:column;gap:8px}
.footer-links a{font-size:14px;color:#B8B3D9;display:inline-flex;align-items:center;gap:8px;transition:color var(--duration) var(--ease),transform var(--duration) var(--ease)}
.footer-links a::before{content:"›";color:#FF6B35;font-family:"JetBrains Mono","SF Mono",Consolas,monospace;font-weight:700}
.footer-links a:hover{color:#FFC94C;transform:translateX(4px)}
.footer-contact{display:flex;flex-direction:column;gap:8px;margin-bottom:16px}
.footer-contact-row{display:flex;gap:12px;align-items:baseline;font-size:14px;color:#B8B3D9}
.footer-contact-label{display:inline-block;min-width:40px;font-size:11px;color:#FF6B35;font-weight:700;letter-spacing:.1em}
.footer-help{font-size:12px;color:rgba(184,179,217,.65);line-height:1.6;padding:10px 12px;background:rgba(255,255,255,.03);border-radius:8px;border-left:2px solid rgba(255,201,76,.3)}
.footer-bottom{position:relative;z-index:1;border-top:1px solid rgba(255,255,255,.06);padding:14px 0}
.footer-bottom-inner{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:12px;font-family:"JetBrains Mono","SF Mono",Consolas,monospace;font-size:12px;color:rgba(184,179,217,.7)}
.footer-dot{color:rgba(255,201,76,.4)}

/* ===== 15. Back to Top ===== */
.back-to-top{position:fixed;right:24px;bottom:24px;z-index:900;display:inline-flex;align-items:center;justify-content:center;width:46px;height:46px;border-radius:14px;background:#2A2463;color:#FFC94C;font-size:20px;border:1px solid rgba(255,201,76,.2);box-shadow:0 8px 32px rgba(0,0,0,.35);opacity:0;visibility:hidden;transform:translateY(12px);transition:opacity var(--duration) var(--ease),transform var(--duration) var(--ease),visibility var(--duration) var(--ease),background var(--duration) var(--ease);clip-path:polygon(0 0,calc(100% - 10px) 0,100% 10px,100% 100%,10px 100%,0 calc(100% - 10px))}
.back-to-top:hover{background:#FF6B35;color:#15122E;border-color:#FF6B35}
.back-to-top.is-visible{opacity:1;visibility:visible;transform:translateY(0)}

@media (max-width:991px){
.footer-grid{grid-template-columns:1fr;gap:32px}
.footer-bottom-inner{flex-direction:column;gap:4px}
.back-to-top{right:16px;bottom:16px}
}

/* ===== 16. Keyframes ===== */
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(61,214,140,.5)}70%{box-shadow:0 0 0 6px rgba(61,214,140,0)}100%{box-shadow:0 0 0 0 rgba(61,214,140,0)}}

/* ===== 17. Focus Visible ===== */
:focus-visible{outline:3px solid #FFC94C;outline-offset:3px;border-radius:4px}

/* ===== 18. Reduced Motion ===== */
@media (prefers-reduced-motion:reduce){
html{scroll-behavior:auto}
*,*::before,*::after{animation-duration:.01ms !important;animation-iteration-count:1 !important;transition-duration:.01ms !important}
html.js [data-reveal]{opacity:1;transform:none;transition:none}
.pulse-dot{animation:none}
}