/* ============================================================
   BOSBM Holdings — Obsidian Platinum CIS (cis.css)
   曜石鉑金 × 靛紫設計系統 | www.bosbm.ai
   機構級 (institutional) 深色形象站基礎
   ============================================================ */

/* ---------- Design Tokens ---------- */
:root{
  /* backgrounds */
  --bg:#0A0A12;            /* 主背景 near-black obsidian */
  --bg-2:#0E0E18;          /* 次背景 */
  --surface:#14141F;       /* 卡面 surface */
  --surface-2:#1B1B2A;     /* 浮起卡面 */

  /* lines */
  --line:rgba(199,205,214,.10);     /* 細線 / 邊框 */
  --line-strong:rgba(139,92,246,.30);

  /* text */
  --text:#C7CDD6;          /* 主文 platinum */
  --text-bright:#F2F4F8;   /* 標題亮白 */
  --text-dim:#8A91A0;      /* 次文 */

  /* accents */
  --indigo:#6366F1;        /* 強調 indigo */
  --violet:#8B5CF6;        /* 亮點 violet */
  --indigo-soft:rgba(99,102,241,.14);
  --violet-soft:rgba(139,92,246,.14);
  --grad:linear-gradient(135deg,#6366F1,#8B5CF6);  /* 主漸層 */

  /* radii */
  --r-sm:10px;
  --r-md:16px;
  --r-lg:24px;
  --r-pill:999px;

  /* shadow */
  --shadow-card:0 12px 40px rgba(0,0,0,.45);
  --shadow-glow:0 0 24px rgba(139,92,246,.35);

  /* layout */
  --nav-h:72px;
  --maxw:100%;

  /* type */
  --font:'PingFang TC','Microsoft JhengHei','Noto Sans TC','Inter',system-ui,-apple-system,sans-serif;
}

/* ---------- Reset ---------- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
img,svg,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;cursor:pointer;border:none;background:none;color:inherit}
ul,ol{list-style:none}
input,select,textarea{font:inherit;color:inherit}

/* ---------- Body ---------- */
body{
  font-family:var(--font);
  background:var(--bg);
  color:var(--text);
  line-height:1.7;
  font-size:16px;
  letter-spacing:.01em;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

/* selection */
::selection{background:rgba(139,92,246,.35);color:#fff}

/* scrollbar (webkit) */
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:var(--bg-2)}
::-webkit-scrollbar-thumb{background:#2a2a3d;border-radius:999px;border:2px solid var(--bg-2)}
::-webkit-scrollbar-thumb:hover{background:#3a3a52}

/* ---------- Typography helpers ---------- */
h1,h2,h3,h4{color:var(--text-bright);font-weight:800;line-height:1.18;letter-spacing:-.01em;text-wrap:balance;overflow-wrap:break-word}
h1{font-size:clamp(1.9rem,4vw,3rem)}
h2{font-size:clamp(1.5rem,2.9vw,2.2rem)}
h3{font-size:clamp(1.15rem,1.8vw,1.4rem)}
p{color:var(--text)}
.grad{
  background:var(--grad);
  -webkit-background-clip:text;
  background-clip:text;
  -webkit-text-fill-color:transparent;
  color:transparent;
}
.text-dim{color:var(--text-dim)}
.text-bright{color:var(--text-bright)}
.center{text-align:center}
.lead{font-size:clamp(1.05rem,1.6vw,1.25rem);color:var(--text-dim);max-width:46ch;text-wrap:pretty;overflow-wrap:break-word}
.lead.center{margin-left:auto;margin-right:auto;text-wrap:balance}
.eyebrow{
  font-size:.82rem;font-weight:700;letter-spacing:.18em;text-transform:uppercase;
  color:var(--violet);
}

/* ============================================================
   NAVBAR — fixed glass
   ============================================================ */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:1000;
  height:var(--nav-h);
  display:flex;align-items:center;
  background:rgba(10,10,18,.9);
  backdrop-filter:blur(16px);
  -webkit-backdrop-filter:blur(16px);
  border-bottom:1px solid var(--line-strong);
}
.nav-inner{
  width:100%;max-width:var(--maxw);margin:0 auto;padding:0 28px;
  display:flex;align-items:center;gap:24px;
}
.nav-logo{display:flex;align-items:center;gap:10px;flex-shrink:0}
.nav-logo img,.nav-logo svg{height:34px;width:auto}
.nav-logo .nav-logo-text{
  font-weight:800;font-size:1.18rem;color:var(--text-bright);letter-spacing:.02em;
}
.nav-links{
  display:flex;align-items:center;gap:30px;margin-left:18px;
}
.nav-links a{
  color:var(--text-dim);font-size:.96rem;font-weight:600;
  position:relative;padding:6px 0;transition:color .2s ease;
}
.nav-links a:hover,.nav-links a.active{color:var(--text-bright)}
.nav-links a.active::after,.nav-links a:hover::after{
  content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;
  background:var(--grad);border-radius:2px;
}
.nav-right{display:flex;align-items:center;gap:14px;margin-left:auto}

/* language select */
#lang-select{
  appearance:none;-webkit-appearance:none;
  background:var(--surface);
  border:1px solid var(--line);
  color:var(--text);
  border-radius:var(--r-pill);
  padding:8px 32px 8px 14px;
  font-size:.88rem;font-weight:600;
  cursor:pointer;transition:border-color .2s ease;
  background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'><path d='M2 4l4 4 4-4' stroke='%238A91A0' stroke-width='1.6' fill='none' stroke-linecap='round' stroke-linejoin='round'/></svg>");
  background-repeat:no-repeat;background-position:right 12px center;
}
#lang-select:hover{border-color:var(--line-strong)}
#lang-select:focus{outline:none;border-color:var(--violet)}
#lang-select option{background:var(--surface);color:var(--text)}

/* nav cta */
.nav-cta{
  display:inline-flex;align-items:center;
  background:var(--grad);color:#fff;font-weight:700;font-size:.92rem;
  padding:10px 20px;border-radius:var(--r-pill);
  box-shadow:var(--shadow-glow);
  transition:transform .2s ease,box-shadow .2s ease;
  white-space:nowrap;
}
.nav-cta:hover{transform:translateY(-1px);box-shadow:0 0 32px rgba(139,92,246,.5)}

/* mobile toggle */
.nav-toggle{display:none;width:42px;height:42px;border-radius:var(--r-sm);
  border:1px solid var(--line);align-items:center;justify-content:center}
.nav-toggle span{display:block;width:18px;height:2px;background:var(--text-bright);
  position:relative;border-radius:2px}
.nav-toggle span::before,.nav-toggle span::after{content:"";position:absolute;left:0;
  width:18px;height:2px;background:var(--text-bright);border-radius:2px}
.nav-toggle span::before{top:-6px}.nav-toggle span::after{top:6px}

/* ============================================================
   LAYOUT — sections / container
   ============================================================ */
.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 28px}
.container-narrow{max-width:820px}
section{position:relative;padding:clamp(64px,9vw,120px) 0}
section.tight{padding:clamp(48px,6vw,80px) 0}
.section-head{max-width:680px;margin:0 0 clamp(36px,5vw,56px)}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center}
.section-head h2{margin:14px 0 16px}
.divider{height:1px;background:var(--line);border:0;margin:0}
.bg-alt{background:var(--bg-2)}

/* ============================================================
   HERO
   ============================================================ */
.hero{
  position:relative;overflow:hidden;
  padding-top:calc(var(--nav-h) + clamp(56px,8vw,110px));
  padding-bottom:clamp(64px,9vw,120px);
}
.hero-bg{
  position:absolute;inset:0;z-index:0;pointer-events:none;
  background:
    radial-gradient(620px 480px at 18% 12%,rgba(99,102,241,.20),transparent 60%),
    radial-gradient(720px 560px at 86% 8%,rgba(139,92,246,.18),transparent 62%),
    radial-gradient(900px 700px at 70% 100%,rgba(99,102,241,.10),transparent 60%),
    var(--bg);
}
.hero-bg::after{
  content:"";position:absolute;inset:0;
  background-image:
    linear-gradient(rgba(199,205,214,.035) 1px,transparent 1px),
    linear-gradient(90deg,rgba(199,205,214,.035) 1px,transparent 1px);
  background-size:60px 60px;
  mask-image:radial-gradient(circle at 50% 30%,#000,transparent 75%);
  -webkit-mask-image:radial-gradient(circle at 50% 30%,#000,transparent 75%);
}
.hero .container{position:relative;z-index:1}
.hero-grid{
  display:grid;grid-template-columns:1fr;gap:48px;align-items:center;
}
.hero-badge{
  display:inline-flex;align-items:center;gap:8px;
  background:var(--violet-soft);
  border:1px solid var(--line-strong);
  color:var(--text-bright);
  font-size:.82rem;font-weight:600;letter-spacing:.04em;
  padding:7px 16px;border-radius:var(--r-pill);
  margin-bottom:24px;
}
.hero-badge .dot{width:7px;height:7px;border-radius:50%;background:var(--violet);
  box-shadow:0 0 10px var(--violet)}
.hero-title{
  font-size:clamp(1.7rem,3.6vw,2.8rem);font-weight:800;line-height:1.18;
  letter-spacing:-.01em;color:var(--text-bright);margin-bottom:22px;
  text-wrap:balance;word-break:keep-all;overflow-wrap:anywhere;
}
.hero-sub{font-size:clamp(1rem,1.5vw,1.18rem);color:var(--text-dim);
  max-width:54ch;margin-bottom:34px}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;align-items:center}
.hero-visual{position:relative}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn-primary,.btn-ghost{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  font-weight:700;font-size:1rem;
  padding:14px 28px;border-radius:var(--r-pill);
  transition:transform .2s ease,box-shadow .2s ease,background .2s ease,color .2s ease;
  white-space:nowrap;
}
.btn-primary{background:var(--grad);color:#fff;box-shadow:var(--shadow-glow)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 0 36px rgba(139,92,246,.55)}
.btn-ghost{background:transparent;border:1px solid var(--violet);color:var(--violet)}
.btn-ghost:hover{background:var(--violet-soft);transform:translateY(-2px)}
.btn-sm{padding:10px 20px;font-size:.92rem}
.btn-lg{padding:16px 34px;font-size:1.08rem}

/* ============================================================
   CARDS
   ============================================================ */
.card-grid{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));
  gap:24px;
}
.card-grid.cols-2{grid-template-columns:repeat(auto-fit,minmax(360px,1fr))}
.card-grid.cols-4{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.card{
  position:relative;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--r-lg);
  padding:32px;
  transition:transform .25s ease,border-color .25s ease,box-shadow .25s ease,background .25s ease;
}
.card:hover{
  transform:translateY(-6px);
  border-color:var(--line-strong);
  box-shadow:var(--shadow-card);
  background:var(--surface-2);
}
.card .card-icon{
  width:52px;height:52px;border-radius:var(--r-md);
  display:flex;align-items:center;justify-content:center;
  background:var(--indigo-soft);border:1px solid var(--line-strong);
  margin-bottom:20px;font-size:1.5rem;color:var(--violet);
}
.card h3{margin-bottom:12px}
.card p{color:var(--text-dim);font-size:.97rem}
.card .card-link{
  display:inline-flex;align-items:center;gap:6px;margin-top:18px;
  color:var(--violet);font-weight:700;font-size:.92rem;
  transition:gap .2s ease;
}
.card:hover .card-link{gap:10px}

/* feature card variant (highlight) */
.card.feature{
  background:linear-gradient(160deg,var(--surface-2),var(--surface));
  border-color:var(--line-strong);
}
.card.feature::before{
  content:"";position:absolute;inset:0;border-radius:var(--r-lg);padding:1px;
  background:var(--grad);
  -webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);
  -webkit-mask-composite:xor;mask-composite:exclude;
  opacity:.5;pointer-events:none;
}

/* ============================================================
   STATS
   ============================================================ */
.stat-grid{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));
  gap:24px;
}
.stat{
  background:var(--surface);border:1px solid var(--line);
  border-radius:var(--r-md);padding:28px 24px;text-align:center;
}
.stat .stat-num{
  font-size:clamp(2rem,4vw,2.8rem);font-weight:800;line-height:1;
  background:var(--grad);-webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent;color:transparent;margin-bottom:8px;
}
.stat .stat-label{color:var(--text-dim);font-size:.92rem;font-weight:600}

/* ============================================================
   PILL / BADGE
   ============================================================ */
.pill{
  display:inline-flex;align-items:center;gap:6px;
  background:var(--indigo-soft);border:1px solid var(--line-strong);
  color:var(--text-bright);font-size:.82rem;font-weight:600;
  padding:6px 14px;border-radius:var(--r-pill);
}
.badge{
  display:inline-flex;align-items:center;gap:6px;
  background:var(--surface-2);border:1px solid var(--line);
  color:var(--text-dim);font-size:.78rem;font-weight:700;
  letter-spacing:.04em;text-transform:uppercase;
  padding:5px 12px;border-radius:var(--r-sm);
}
.badge.violet{color:var(--violet);border-color:var(--line-strong);background:var(--violet-soft)}
.pill-row{display:flex;flex-wrap:wrap;gap:10px}

/* ============================================================
   LIST / CHECK
   ============================================================ */
.check-list{display:flex;flex-direction:column;gap:14px}
.check-list li{display:flex;align-items:flex-start;gap:12px;color:var(--text)}
.check-list li::before{
  content:"";flex-shrink:0;width:22px;height:22px;margin-top:2px;border-radius:50%;
  background:var(--violet-soft);border:1px solid var(--line-strong);
  background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'><path d='M2.5 6.2l2.3 2.3 4.7-5' stroke='%238B5CF6' stroke-width='1.6' fill='none' stroke-linecap='round' stroke-linejoin='round'/></svg>");
  background-repeat:no-repeat;background-position:center;
}

/* ============================================================
   CTA BAND
   ============================================================ */
.cta-band{
  position:relative;overflow:hidden;
  background:linear-gradient(160deg,var(--surface-2),var(--bg-2));
  border:1px solid var(--line-strong);border-radius:var(--r-lg);
  padding:clamp(40px,6vw,72px);text-align:center;
}
.cta-band::before{
  content:"";position:absolute;inset:0;z-index:0;pointer-events:none;
  background:radial-gradient(600px 320px at 50% -20%,rgba(139,92,246,.22),transparent 70%);
}
.cta-band > *{position:relative;z-index:1}
.cta-band h2{margin-bottom:16px}
.cta-band .hero-actions{justify-content:center;margin-top:28px}

/* ============================================================
   REVEAL ON SCROLL
   ============================================================ */
.reveal{opacity:0;transform:translateY(28px);
  transition:opacity .7s cubic-bezier(.2,.7,.2,1),transform .7s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}
.reveal.d1{transition-delay:.08s}
.reveal.d2{transition-delay:.16s}
.reveal.d3{transition-delay:.24s}
.reveal.d4{transition-delay:.32s}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
  html{scroll-behavior:auto}
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer{
  background:var(--bg-2);
  border-top:1px solid var(--line-strong);
  padding:clamp(56px,7vw,84px) 0 36px;
}
.footer-grid{
  display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;
  gap:40px;margin-bottom:48px;
}
.footer-col h4{
  color:var(--text-bright);font-size:.82rem;font-weight:700;
  letter-spacing:.12em;text-transform:uppercase;margin-bottom:18px;
}
.footer-col ul{display:flex;flex-direction:column;gap:12px}
.footer-col a{color:var(--text-dim);font-size:.94rem;transition:color .2s ease}
.footer-col a:hover{color:var(--violet)}
.footer-brand .footer-logo{display:flex;align-items:center;gap:10px;margin-bottom:18px}
.footer-brand .footer-logo img,.footer-brand .footer-logo svg{height:32px;width:auto}
.footer-brand .footer-logo span{font-weight:800;font-size:1.15rem;color:var(--text-bright)}
.footer-brand p{color:var(--text-dim);font-size:.94rem;max-width:34ch}
.footer-bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;
  padding-top:28px;border-top:1px solid var(--line);
  color:var(--text-dim);font-size:.86rem;
}
.footer-bottom .footer-meta{display:flex;flex-wrap:wrap;gap:18px}

/* ============================================================
   UTILITIES
   ============================================================ */
.mt-0{margin-top:0}.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-0{margin-bottom:0}.mb-2{margin-bottom:16px}.mb-3{margin-bottom:24px}.mb-4{margin-bottom:32px}
.flex{display:flex}.flex-col{flex-direction:column}.items-center{align-items:center}
.justify-center{justify-content:center}.justify-between{justify-content:space-between}
.gap-2{gap:16px}.gap-3{gap:24px}.wrap{flex-wrap:wrap}
.grid-2{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:40px;align-items:center}
.full{width:100%}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (min-width:960px){
  .hero-grid.split{grid-template-columns:1.1fr .9fr}
}
@media (max-width:960px){
  :root{--nav-h:64px}
  .nav-inner{padding:0 20px}
  .nav-links,.nav-right .nav-cta-desktop{display:none}
  .nav-toggle{display:flex}
  .nav-right{gap:10px}
  /* mobile menu (toggled via .open on .nav) */
  .nav.open .nav-links{
    display:flex;flex-direction:column;align-items:flex-start;gap:6px;
    position:absolute;top:var(--nav-h);left:0;right:0;
    background:rgba(10,10,18,.98);backdrop-filter:blur(16px);
    border-bottom:1px solid var(--line-strong);
    margin:0;padding:18px 20px;
  }
  .nav.open .nav-links a{padding:10px 0;font-size:1.05rem;width:100%}
  .nav.open .nav-links a.active::after,.nav.open .nav-links a:hover::after{display:none}
}
@media (max-width:760px){
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .footer-brand{grid-column:1 / -1}
  .hero-actions{flex-direction:column;align-items:stretch}
  .hero-actions .btn-primary,.hero-actions .btn-ghost{width:100%}
  .grid-2{grid-template-columns:1fr}
}
@media (max-width:520px){
  .container{padding:0 18px}
  .card{padding:24px}
  .footer-grid{grid-template-columns:1fr}
  #lang-select{padding:7px 28px 7px 12px;font-size:.82rem}
}