/* ============================================
   KEJILION.PRO — Design System
   Deep/Light mode · Glassmorphism · Responsive
   ============================================ */

/* --- Reset & Base --- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:'Inter','Segoe UI','PingFang SC','Microsoft YaHei',sans-serif;line-height:1.7;min-height:100vh;overflow-x:hidden;transition:background .3s,color .3s}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none;transition:color .2s,opacity .2s}
ul,ol{list-style:none}

/* --- CSS Variables: Dark (default) --- */
:root{
  --bg:#0b0f19;
  --bg-alt:#111827;
  --surface:rgba(255,255,255,.05);
  --surface-hover:rgba(255,255,255,.1);
  --border:rgba(255,255,255,.08);
  --text:#e2e8f0;
  --text-muted:#94a3b8;
  --text-heading:#f1f5f9;
  --accent:#3b82f6;
  --accent-hover:#60a5fa;
  --accent-glow:rgba(59,130,246,.25);
  --gradient-start:#1e3a5f;
  --gradient-end:#0b0f19;
  --card-bg:rgba(255,255,255,.04);
  --card-border:rgba(255,255,255,.06);
  --card-shadow:0 8px 32px rgba(0,0,0,.4);
  --nav-bg:rgba(11,15,25,.62);
  --nav-shadow:0 1px 0 rgba(255,255,255,.05);
  --footer-bg:rgba(0,0,0,.3);
  --badge-bg:rgba(59,130,246,.15);
  --badge-text:#60a5fa;
  --hero-overlay:linear-gradient(135deg,rgba(30,58,95,.9),rgba(11,15,25,.95));
  --timeline-line:rgba(59,130,246,.3);
  --timeline-dot:#3b82f6;
  --scrollbar-thumb:rgba(255,255,255,.15);
  --scrollbar-track:transparent;
}

/* --- Light Mode --- */
:root[data-theme="light"]{
  --bg:#f8fafc;
  --bg-alt:#ffffff;
  --surface:rgba(0,0,0,.03);
  --surface-hover:rgba(0,0,0,.06);
  --border:rgba(0,0,0,.08);
  --text:#1e293b;
  --text-muted:#64748b;
  --text-heading:#0f172a;
  --accent:#2563eb;
  --accent-hover:#1d4ed8;
  --accent-glow:rgba(37,99,235,.15);
  --gradient-start:#dbeafe;
  --gradient-end:#f8fafc;
  --card-bg:rgba(255,255,255,.7);
  --card-border:rgba(0,0,0,.08);
  --card-shadow:0 4px 24px rgba(0,0,0,.06);
  --nav-bg:rgba(248,250,252,.68);
  --nav-shadow:0 1px 0 rgba(0,0,0,.06);
  --footer-bg:rgba(0,0,0,.03);
  --badge-bg:rgba(37,99,235,.1);
  --badge-text:#2563eb;
  --hero-overlay:linear-gradient(135deg,rgba(219,234,254,.92),rgba(248,250,252,.96));
  --timeline-line:rgba(37,99,235,.2);
  --timeline-dot:#2563eb;
  --scrollbar-thumb:rgba(0,0,0,.15);
  --scrollbar-track:transparent;
}

/* --- Background --- */
body{background:var(--bg);color:var(--text)}
body::before{content:'';position:fixed;inset:0;z-index:-1;background:linear-gradient(160deg,var(--gradient-start) 0%,var(--bg) 50%,var(--bg) 100%);pointer-events:none}

/* --- Scrollbar --- */
::-webkit-scrollbar{width:8px}
::-webkit-scrollbar-track{background:var(--scrollbar-track)}
::-webkit-scrollbar-thumb{background:var(--scrollbar-thumb);border-radius:4px}

/* --- Container --- */
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 24px}

/* =====================
   NAVIGATION
   ===================== */
.navbar{position:sticky;top:0;z-index:1000;background:var(--nav-bg);backdrop-filter:blur(22px) saturate(1.25);-webkit-backdrop-filter:blur(22px) saturate(1.25);border-bottom:1px solid var(--border);box-shadow:none;padding:0 24px;transition:background .3s,backdrop-filter .3s}
.navbar .container{display:flex;align-items:center;justify-content:space-between;height:64px}
.nav-brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:1.15rem;color:var(--text-heading);letter-spacing:.5px}
.nav-brand img{height:28px;width:auto}
.nav-links{display:flex;align-items:center;gap:6px}
.nav-links a,.nav-links button{padding:8px 14px;border-radius:8px;font-size:.875rem;font-weight:500;color:var(--text-muted);border:none;background:none;cursor:pointer;transition:color .2s,background .2s;white-space:nowrap}
.nav-links a:hover,.nav-links button:hover{color:var(--text-heading);background:var(--surface-hover)}
.nav-links a.active{color:var(--accent);background:var(--badge-bg)}
.nav-external{color:var(--text-muted)!important;font-size:.8rem!important}
.nav-actions{display:flex;align-items:center;gap:8px}
.btn-icon{width:36px;height:36px;border-radius:8px;border:1px solid var(--border);background:var(--surface);color:var(--text-muted);display:inline-flex;align-items:center;justify-content:center;cursor:pointer;transition:all .2s;font-size:1rem}
.btn-icon:hover{background:var(--surface-hover);color:var(--text-heading);border-color:var(--accent)}
.lang-switch{padding:6px 12px;border-radius:8px;border:1px solid var(--border);background:var(--surface);color:var(--text-muted);font-size:.8rem;font-weight:600;cursor:pointer;transition:all .2s;text-transform:uppercase;letter-spacing:.5px}
.lang-switch:hover{border-color:var(--accent);color:var(--accent)}

/* Mobile nav */
.nav-toggle{display:none;width:36px;height:36px;border:none;background:none;color:var(--text);cursor:pointer;font-size:1.3rem}
@media(max-width:960px){
  :root[data-theme="light"] .nav-links{background:rgba(248,250,252,.92);}
  .nav-links{position:fixed;top:64px;left:0;right:0;background:rgba(11,15,25,.90);backdrop-filter:blur(22px) saturate(1.2);-webkit-backdrop-filter:blur(22px) saturate(1.2);border-bottom:1px solid var(--border);flex-direction:column;padding:16px 24px;gap:4px;transform:translateY(-120%);transition:transform .3s;box-shadow:none}
  .nav-links.open{transform:translateY(0)}
  .nav-links a,.nav-links button{width:100%;text-align:left;padding:12px 16px}
  .nav-toggle{display:flex;align-items:center;justify-content:center}
}

/* =====================
   HERO
   ===================== */
.hero{position:relative;padding:100px 0 80px;overflow:hidden;text-align:center}
.hero::before{content:'';position:absolute;inset:0;background:var(--hero-overlay);z-index:0}
.hero .container{position:relative;z-index:1}
.hero-badge{display:inline-block;padding:6px 16px;border-radius:20px;background:var(--badge-bg);color:var(--badge-text);font-size:.8rem;font-weight:600;margin-bottom:20px;letter-spacing:.5px}
.hero h1{font-size:clamp(2rem,5vw,3.5rem);font-weight:800;color:var(--text-heading);line-height:1.2;margin-bottom:16px;letter-spacing:-.5px}
.hero .subtitle{font-size:clamp(1rem,2.5vw,1.25rem);color:var(--text-muted);max-width:640px;margin:0 auto 32px;line-height:1.7}
.hero-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}

/* =====================
   BUTTONS
   ===================== */
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 24px;border-radius:10px;font-size:.9rem;font-weight:600;cursor:pointer;transition:all .2s;border:none;text-decoration:none}
.btn-primary{background:var(--accent);color:#fff;box-shadow:0 4px 14px var(--accent-glow)}
.btn-primary:hover{background:var(--accent-hover);transform:translateY(-1px);box-shadow:0 6px 20px var(--accent-glow)}
.btn-outline{background:transparent;color:var(--text);border:1px solid var(--border)}
.btn-outline:hover{border-color:var(--accent);color:var(--accent);background:var(--accent-glow)}
.btn-sm{padding:8px 16px;font-size:.8rem;border-radius:8px}

/* =====================
   SECTIONS
   ===================== */
.section{padding:80px 0}
.section-alt{background:var(--bg-alt)}
.section-header{text-align:center;margin-bottom:48px}
.section-header h2{font-size:clamp(1.5rem,3vw,2.25rem);font-weight:700;color:var(--text-heading);margin-bottom:12px}
.section-header p{color:var(--text-muted);max-width:600px;margin:0 auto;font-size:1rem}
.section-label{display:inline-block;padding:4px 12px;border-radius:12px;background:var(--badge-bg);color:var(--badge-text);font-size:.75rem;font-weight:600;margin-bottom:12px;text-transform:uppercase;letter-spacing:1px}

/* =====================
   GRID
   ===================== */
.grid{display:grid;gap:24px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
@media(max-width:768px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}}
@media(min-width:769px) and (max-width:1024px){.grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}}

/* =====================
   CARDS
   ===================== */
.card{background:var(--card-bg);border:1px solid var(--card-border);border-radius:16px;padding:28px;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);box-shadow:var(--card-shadow);transition:transform .2s,box-shadow .2s,border-color .2s}
.card:hover{transform:translateY(-4px);border-color:var(--accent);box-shadow:0 12px 40px rgba(0,0,0,.3)}
.card-icon{color:var(--accent);width:48px;height:48px;border-radius:12px;background:var(--badge-bg);display:flex;align-items:center;justify-content:center;font-size:1.4rem;margin-bottom:16px}
.card h3{font-size:1.1rem;font-weight:600;color:var(--text-heading);margin-bottom:8px}
.card p{font-size:.9rem;color:var(--text-muted);line-height:1.6}
.card-img{width:100%;border-radius:12px;margin-bottom:16px;object-fit:cover}
.card-link{display:inline-flex;align-items:center;gap:6px;margin-top:12px;font-size:.85rem;font-weight:500;color:var(--accent)}
.card-link:hover{color:var(--accent-hover)}

/* =====================
   FEATURE LIST
   ===================== */
.feature-list{display:flex;flex-direction:column;gap:16px}
.feature-item{display:flex;gap:16px;align-items:flex-start;padding:20px;border-radius:12px;background:var(--surface);border:1px solid var(--border);transition:border-color .2s}
.feature-item:hover{border-color:var(--accent)}
.feature-item .icon{flex-shrink:0;width:40px;height:40px;border-radius:10px;background:var(--badge-bg);display:flex;align-items:center;justify-content:center;font-size:1.1rem}
.feature-item h4{font-size:.95rem;font-weight:600;color:var(--text-heading);margin-bottom:4px}
.feature-item p{font-size:.85rem;color:var(--text-muted)}

/* =====================
   TIMELINE
   ===================== */
.timeline{position:relative;padding-left:32px}
.timeline::before{content:'';position:absolute;left:7px;top:0;bottom:0;width:2px;background:var(--timeline-line)}
.timeline-item{position:relative;padding-bottom:32px}
.timeline-item:last-child{padding-bottom:0}
.timeline-item::before{content:'';position:absolute;left:-29px;top:6px;width:12px;height:12px;border-radius:50%;background:var(--timeline-dot);border:3px solid var(--bg);box-shadow:0 0 0 2px var(--timeline-dot)}
.timeline-item .year{font-size:.8rem;font-weight:700;color:var(--accent);margin-bottom:4px;letter-spacing:.5px}
.timeline-item h4{font-size:1rem;font-weight:600;color:var(--text-heading);margin-bottom:4px}
.timeline-item p{font-size:.875rem;color:var(--text-muted);line-height:1.6}

/* =====================
   VPS CARDS
   ===================== */
.vps-card{text-align:center;padding:32px 24px}
.vps-card img{width:80px;height:80px;object-fit:contain;margin:0 auto 16px;border-radius:12px}
.vps-card h3{margin-bottom:8px}

/* =====================
   LINK GRID (for dh / daohangzhan)
   ===================== */
.link-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:12px}
.link-item{display:flex;align-items:center;gap:10px;padding:14px 16px;border-radius:10px;background:var(--surface);border:1px solid var(--border);transition:all .2s;font-size:.9rem;color:var(--text)}
.link-item:hover{border-color:var(--accent);background:var(--surface-hover);color:var(--accent)}
.link-item img{width:20px;height:20px;border-radius:4px}
.link-item i{width:20px;flex:0 0 20px;text-align:center;font-size:18px;line-height:1;color:currentColor;opacity:.9}

/* =====================
   ABOUT PAGE
   ===================== */
.about-hero{display:flex;align-items:center;gap:48px;flex-wrap:wrap}
.about-avatar{width:200px;height:200px;border-radius:50%;object-fit:cover;border:4px solid var(--accent);box-shadow:0 0 40px var(--accent-glow)}
.about-info{flex:1;min-width:280px}
.about-info h1{font-size:2rem;font-weight:800;color:var(--text-heading);margin-bottom:8px}
.about-info .tagline{font-size:1.1rem;color:var(--accent);margin-bottom:16px}
.about-info p{color:var(--text-muted);line-height:1.8}

/* =====================
   STATS
   ===================== */
.stats{display:flex;gap:32px;flex-wrap:wrap;justify-content:center;padding:24px 0}
.stat{text-align:center}
.stat .number{font-size:2rem;font-weight:800;color:var(--accent);display:block}
.stat .label{font-size:.8rem;color:var(--text-muted);margin-top:4px}

/* =====================
   FOOTER
   ===================== */
.footer{padding:48px 0 32px;background:var(--footer-bg);border-top:1px solid var(--border)}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px}
@media(max-width:768px){.footer-grid{grid-template-columns:1fr}}
.footer h4{font-size:.9rem;font-weight:600;color:var(--text-heading);margin-bottom:16px}
.footer p,.footer a{font-size:.85rem;color:var(--text-muted);line-height:1.8}
.footer a:hover{color:var(--accent)}
.footer-bottom{margin-top:32px;padding-top:24px;border-top:1px solid var(--border);display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px}
.footer-bottom p{font-size:.8rem;color:var(--text-muted)}

/* =====================
   UTILITIES
   ===================== */
.text-center{text-align:center}
.text-accent{color:var(--accent)}
.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}
.gap-sm{gap:12px}.gap-md{gap:24px}.gap-lg{gap:40px}
.hidden{display:none}


/* Hero avatar (homepage) */
.hero-avatar-wrap{display:flex;flex-direction:column;align-items:center;gap:16px;margin-bottom:12px}
.hero-avatar{width:96px;height:96px;border-radius:50%;border:3px solid var(--accent);box-shadow:0 0 24px var(--accent-glow);object-fit:cover}
@media(max-width:640px){.hero-avatar{width:80px;height:80px}}


/* Icon spacing when using Font Awesome in buttons/links */
.btn i{margin-right:6px;}
.card-link i{margin-right:4px;}
.nav-external i{margin-right:4px;}


/* =====================
   PARTNER GRID
   ===================== */
.partner-grid{align-items:stretch}
.partner-card{display:flex;flex-direction:column;justify-content:space-between;min-height:220px}
.partner-logo-wrap{width:56px;height:56px;border-radius:16px;background:var(--badge-bg);display:flex;align-items:center;justify-content:center;margin-bottom:16px;border:1px solid var(--border)}
.partner-logo-text{font-weight:800;font-size:1.4rem;color:var(--accent)}
.partner-card h3{margin-bottom:8px}
.partner-card p{font-size:.9rem;color:var(--text-muted)}


/* About page portrait layout: avatar on top, text/buttons below */
@media(max-width:960px){
  .about-hero{flex-direction:column;align-items:center;justify-content:center;text-align:center;gap:24px}
  .about-avatar{margin:0 auto}
  .about-info{min-width:0;max-width:680px;text-align:center}
  .about-info .hero-actions{justify-content:center}
}