@charset "UTF-8";

/* =========================================================
   知幾有限公司 ZHI JI CO., LTD.
   品牌色票（依 CI 規範）
   主色   智慧藍 #112B4E － 洞察・智慧・沉穩
   次主色 深穩藍 #243B6B － 專業・信任・深度
   輔色   預見金 #C79A3B － 預見・價值・核心亮點
   輔色2  晨曦金 #E0C27A － 光明・希望・溫暖
   輔色3  數據灰 #8B95A5 － 科技・精準・理性
   背景色 科技白 #F5F7F6 － 純淨・簡潔・未來感
   ========================================================= */

:root{
  --navy:#112B4E;
  --navy-2:#243B6B;
  --gold:#C79A3B;
  --gold-2:#E0C27A;
  --gray:#8B95A5;
  --bg:#F5F7F6;

  --ink:#16233A;
  --ink-soft:#4A5568;
  --line:rgba(17,43,78,.12);
  --line-gold:rgba(199,154,59,.35);

  --wrap:1180px;
  --r:14px;
  --r-lg:22px;

  --shadow-sm:0 2px 10px rgba(17,43,78,.06);
  --shadow:0 14px 40px rgba(17,43,78,.10);

  --sans:"Noto Sans TC","PingFang TC","Microsoft JhengHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --serif:"Noto Serif TC","PingFang TC","Songti TC",Georgia,serif;

  --ease:cubic-bezier(.22,.68,.26,1);
}

*,*::before,*::after{box-sizing:border-box;}

html{
  scroll-behavior:smooth;
  scroll-padding-top:88px;
  -webkit-text-size-adjust:100%;
}

body{
  margin:0;
  font-family:var(--sans);
  font-weight:400;
  font-size:clamp(15px,.35vw + 14px,16.5px);
  line-height:1.85;
  color:var(--ink);
  background:var(--bg);
  letter-spacing:.02em;
  -webkit-font-smoothing:antialiased;
}

img,svg{max-width:100%;height:auto;display:block;}

h1,h2,h3{
  font-family:var(--serif);
  font-weight:700;
  line-height:1.35;
  letter-spacing:.01em;
  margin:0;
  color:var(--navy);
}

p{margin:0;}
ul,ol{margin:0;padding:0;list-style:none;}
a{color:inherit;text-decoration:none;}

.wrap{
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding-inline:clamp(20px,5vw,40px);
}

.accent{color:var(--gold);}

.skip-link{
  position:absolute;left:-9999px;top:0;z-index:200;
  background:var(--gold);color:var(--navy);
  padding:12px 20px;border-radius:0 0 10px 0;font-weight:700;
}
.skip-link:focus{left:0;}

:focus-visible{
  outline:2px solid var(--gold);
  outline-offset:3px;
  border-radius:4px;
}

/* ---------------------------------------------------------
   Header
   --------------------------------------------------------- */
.site-header{
  position:fixed;inset:0 0 auto 0;z-index:100;
  transition:background .35s var(--ease),box-shadow .35s var(--ease),border-color .35s var(--ease);
  border-bottom:1px solid transparent;
}
.site-header.is-stuck{
  background:rgba(17,43,78,.94);
  backdrop-filter:saturate(160%) blur(14px);
  border-bottom-color:var(--line-gold);
  box-shadow:0 10px 34px rgba(17,43,78,.24);
}

.header-inner{
  display:flex;align-items:center;justify-content:space-between;gap:20px;
  min-height:76px;
}

.brand{display:flex;align-items:center;gap:12px;}

/* 標誌原稿為白底設計，於深色底上以白色圓形襯底呈現，確保完整還原 CI */
.brand-mark,.hero-mark,.footer-brand img{
  background:#fff;
  border-radius:50%;
  box-shadow:0 0 0 1px var(--line-gold),0 6px 18px rgba(0,0,0,.28);
}
.brand-mark{width:46px;height:46px;flex:none;}
.brand-text{display:flex;flex-direction:column;line-height:1.25;}
.brand-text strong{
  font-family:var(--serif);font-size:1.12rem;font-weight:700;
  color:#fff;letter-spacing:.08em;
}
.brand-text em{
  font-style:normal;font-size:.62rem;font-weight:500;
  color:var(--gold-2);letter-spacing:.24em;
}

.nav{display:flex;align-items:center;gap:clamp(14px,2vw,30px);}
.nav a{
  position:relative;
  font-size:.94rem;font-weight:500;color:rgba(255,255,255,.86);
  padding:6px 0;transition:color .25s var(--ease);
}
.nav a::after{
  content:"";position:absolute;left:0;right:100%;bottom:0;height:1.5px;
  background:var(--gold);transition:right .3s var(--ease);
}
.nav a:hover{color:#fff;}
.nav a:hover::after{right:0;}

.nav .nav-cta{
  padding:9px 22px;border-radius:999px;
  border:1px solid var(--line-gold);
  background:rgba(199,154,59,.14);
  color:var(--gold-2);font-weight:700;
  transition:background .25s var(--ease),color .25s var(--ease),border-color .25s var(--ease);
}
.nav .nav-cta::after{display:none;}
.nav .nav-cta:hover{background:var(--gold);color:var(--navy);border-color:var(--gold);}

.nav-toggle{
  display:none;
  width:44px;height:44px;padding:11px 9px;
  background:none;border:0;cursor:pointer;
  flex-direction:column;justify-content:space-between;
}
.nav-toggle span{
  display:block;height:2px;width:100%;background:#fff;border-radius:2px;
  transition:transform .3s var(--ease),opacity .2s var(--ease);
}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(9px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0;}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-9px) rotate(-45deg);}

/* ---------------------------------------------------------
   Hero
   --------------------------------------------------------- */
.hero{position:relative;isolation:isolate;overflow:hidden;}
.hero-bg{
  position:absolute;inset:0;z-index:-1;
  background:
    radial-gradient(1100px 620px at 78% 8%,rgba(199,154,59,.22),transparent 62%),
    radial-gradient(880px 560px at 12% 92%,rgba(36,59,107,.85),transparent 60%),
    linear-gradient(165deg,#0C2142 0%,var(--navy) 42%,var(--navy-2) 100%);
}
.hero-bg::after{
  content:"";position:absolute;inset:0;opacity:.5;
  background-image:
    linear-gradient(rgba(255,255,255,.045) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.045) 1px,transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(circle at 50% 40%,#000 10%,transparent 78%);
}

.hero-inner{
  display:flex;flex-direction:column;align-items:center;text-align:center;
  padding-block:clamp(140px,17vw,190px) clamp(70px,9vw,104px);
  color:#fff;
}
.hero-mark{
  width:clamp(104px,12vw,136px);height:auto;
  box-shadow:0 0 0 1px var(--line-gold),0 20px 46px rgba(0,0,0,.45);
  margin-bottom:30px;
}

.eyebrow{
  font-size:.78rem;font-weight:700;letter-spacing:.4em;text-indent:.4em;
  color:var(--gold-2);text-transform:uppercase;margin-bottom:22px;
}

.hero h1{
  font-size:clamp(1.85rem,4.6vw,3.35rem);
  font-weight:900;color:#fff;line-height:1.42;
  text-shadow:0 6px 30px rgba(0,0,0,.32);
  /* ch 以拉丁字元寬度計算，中文字幅較寬，故放寬以免標題斷在錯的位置 */
  max-width:min(100%,36ch);
}

.lead{
  margin-top:26px;max-width:48ch;
  color:rgba(255,255,255,.82);font-size:1.02rem;font-weight:300;line-height:2.05;
}

.pill-row{
  display:flex;flex-wrap:wrap;justify-content:center;gap:10px;
  margin-top:34px;
}
.pill-row li{
  padding:8px 20px;border-radius:999px;
  border:1px solid var(--line-gold);
  background:rgba(255,255,255,.05);
  color:var(--gold-2);
  font-size:.86rem;font-weight:500;letter-spacing:.12em;
}

.btn-row{display:flex;flex-wrap:wrap;justify-content:center;gap:14px;margin-top:40px;}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:14px 34px;border-radius:999px;border:1px solid transparent;
  font-family:var(--sans);font-size:.95rem;font-weight:700;letter-spacing:.08em;
  cursor:pointer;
  transition:transform .25s var(--ease),box-shadow .25s var(--ease),background .25s var(--ease),color .25s var(--ease);
}
.btn-gold{
  background:linear-gradient(135deg,var(--gold-2),var(--gold));
  color:var(--navy);
  box-shadow:0 12px 30px rgba(199,154,59,.32);
}
.btn-gold:hover{transform:translateY(-2px);box-shadow:0 18px 40px rgba(199,154,59,.44);}
.btn-ghost{
  border-color:rgba(255,255,255,.34);color:#fff;background:rgba(255,255,255,.04);
}
.btn-ghost:hover{background:rgba(255,255,255,.13);transform:translateY(-2px);}

.hero-strip{
  border-top:1px solid rgba(255,255,255,.12);
  background:rgba(9,25,50,.5);
}
.hero-strip-inner{
  display:flex;align-items:center;justify-content:center;flex-wrap:wrap;
  gap:clamp(14px,4vw,42px);
  padding-block:20px;
}
.hero-strip-inner span{
  font-family:var(--serif);font-weight:700;
  font-size:clamp(.92rem,1.6vw,1.12rem);
  letter-spacing:.3em;text-indent:.3em;
  color:var(--gold-2);
}
.hero-strip-inner i{width:5px;height:5px;border-radius:50%;background:var(--gold);opacity:.7;}

/* ---------------------------------------------------------
   Sections
   --------------------------------------------------------- */
.section{padding-block:clamp(70px,9vw,116px);position:relative;}
.section-soft{background:linear-gradient(180deg,#fff 0%,#EDF1F5 100%);}
.section-dark{
  background:linear-gradient(160deg,var(--navy) 0%,var(--navy-2) 100%);
  color:rgba(255,255,255,.84);
}
.section-dark h2,.section-dark h3{color:#fff;}

.section-head{
  max-width:64ch;margin-inline:auto;margin-bottom:clamp(40px,5vw,62px);
  text-align:center;
}

.kicker{
  display:inline-block;
  font-size:.74rem;font-weight:700;letter-spacing:.36em;text-indent:.36em;
  color:var(--gold);margin-bottom:16px;
  position:relative;padding-bottom:12px;
}
.kicker::after{
  content:"";position:absolute;left:50%;transform:translateX(-50%);
  bottom:0;width:34px;height:2px;background:var(--gold);
}
.section-head h2{font-size:clamp(1.5rem,3.2vw,2.3rem);}
.section-lead{
  margin-top:20px;color:var(--ink-soft);font-weight:300;line-height:2.05;
}
.section-dark .section-lead{color:rgba(255,255,255,.7);}

.grid{display:grid;gap:clamp(18px,2.4vw,26px);}
/* 固定 2 欄，避免四張卡片排成 3+1 的孤行 */
.grid-2{grid-template-columns:minmax(0,1fr);}
@media (min-width:760px){
  .grid-2{grid-template-columns:repeat(2,minmax(0,1fr));}
}
.grid-4{grid-template-columns:repeat(auto-fit,minmax(230px,1fr));}

/* --- 品牌理念 --- */
.value-card{
  position:relative;overflow:hidden;
  padding:38px 28px 32px;border-radius:var(--r-lg);
  background:#fff;border:1px solid var(--line);
  box-shadow:var(--shadow-sm);
  transition:transform .35s var(--ease),box-shadow .35s var(--ease),border-color .35s var(--ease);
}
.value-card::before{
  content:"";position:absolute;inset:0 0 auto 0;height:3px;
  background:linear-gradient(90deg,var(--gold),var(--gold-2));
  transform:scaleX(0);transform-origin:left;
  transition:transform .45s var(--ease);
}
.value-card:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:var(--line-gold);}
.value-card:hover::before{transform:scaleX(1);}
.value-idx{
  position:absolute;top:16px;right:22px;
  font-family:var(--serif);font-size:2.6rem;font-weight:900;
  color:var(--navy);opacity:.07;line-height:1;
}
.value-card h3{font-size:1.28rem;letter-spacing:.1em;}
.value-en{
  margin:6px 0 16px;
  font-size:.7rem;font-weight:700;letter-spacing:.22em;
  color:var(--gold);text-transform:uppercase;
}
.value-card p:last-child{color:var(--ink-soft);font-size:.94rem;font-weight:300;}

/* --- 核心服務 --- */
.svc-card{
  padding:clamp(28px,3.4vw,42px);border-radius:var(--r-lg);
  background:rgba(255,255,255,.055);
  border:1px solid rgba(255,255,255,.1);
  backdrop-filter:blur(6px);
  transition:transform .35s var(--ease),background .35s var(--ease),border-color .35s var(--ease);
}
.svc-card:hover{
  transform:translateY(-6px);
  background:rgba(255,255,255,.09);
  border-color:var(--line-gold);
}
.svc-icon{
  width:56px;height:56px;border-radius:16px;
  display:grid;place-items:center;margin-bottom:22px;
  background:linear-gradient(140deg,rgba(224,194,122,.22),rgba(199,154,59,.1));
  border:1px solid var(--line-gold);
  color:var(--gold-2);
}
.svc-icon svg{width:26px;height:26px;}
.svc-card h3{font-size:1.24rem;margin-bottom:14px;line-height:1.55;}
.svc-card > p{color:rgba(255,255,255,.74);font-size:.95rem;font-weight:300;}

.tick{margin-top:22px;padding-top:20px;border-top:1px dashed rgba(255,255,255,.16);display:grid;gap:11px;}
.tick li{
  position:relative;padding-left:26px;
  font-size:.9rem;color:rgba(255,255,255,.8);line-height:1.7;
}
.tick li::before{
  content:"";position:absolute;left:2px;top:.62em;
  width:9px;height:9px;border-radius:2px;
  background:var(--gold);transform:rotate(45deg);
}

/* --- 應用領域 --- */
.field-card{
  padding:34px 26px;border-radius:var(--r-lg);
  background:#fff;border:1px solid var(--line);
  box-shadow:var(--shadow-sm);
  transition:transform .35s var(--ease),box-shadow .35s var(--ease);
  border-top:3px solid var(--gold);
}
.field-card:hover{transform:translateY(-6px);box-shadow:var(--shadow);}
.field-card h3{font-size:1.2rem;letter-spacing:.12em;margin-bottom:14px;}
.field-card p{color:var(--ink-soft);font-size:.93rem;font-weight:300;}

/* --- 合作流程 --- */
.steps{
  display:grid;gap:clamp(16px,2vw,22px);
  grid-template-columns:repeat(auto-fit,minmax(200px,1fr));
  counter-reset:step;
}
.step{
  position:relative;padding:34px 24px 30px;
  background:#fff;border-radius:var(--r-lg);
  border:1px solid var(--line);box-shadow:var(--shadow-sm);
  transition:transform .35s var(--ease),box-shadow .35s var(--ease);
}
.step:hover{transform:translateY(-6px);box-shadow:var(--shadow);}
.step-no{
  display:inline-grid;place-items:center;
  width:44px;height:44px;border-radius:50%;margin-bottom:18px;
  background:linear-gradient(135deg,var(--navy),var(--navy-2));
  color:var(--gold-2);
  font-family:var(--serif);font-size:.92rem;font-weight:700;letter-spacing:.04em;
  box-shadow:0 8px 20px rgba(17,43,78,.24);
}
.step h3{font-size:1.1rem;letter-spacing:.1em;margin-bottom:10px;}
.step p{color:var(--ink-soft);font-size:.9rem;font-weight:300;}

/* --- 選擇知幾 --- */
.why-wrap{
  display:grid;gap:clamp(34px,5vw,64px);
  grid-template-columns:minmax(0,1fr);
  align-items:start;
}
.why-lead h2{font-size:clamp(1.5rem,2.8vw,1.95rem);margin-top:4px;}
.why-lead .btn{margin-top:30px;}
.why-lead .kicker::after{left:0;transform:none;}
.why-list{display:grid;gap:16px;}
.why-item{
  padding:26px 28px;border-radius:var(--r);
  background:rgba(255,255,255,.055);
  border-left:3px solid var(--gold);
  transition:background .3s var(--ease),transform .3s var(--ease);
}
.why-item:hover{background:rgba(255,255,255,.1);transform:translateX(5px);}
.why-item h3{font-size:1.08rem;margin-bottom:9px;letter-spacing:.06em;}
.why-item p{color:rgba(255,255,255,.72);font-size:.93rem;font-weight:300;}

/* --- 聯絡我們 --- */
.contact-wrap{
  display:grid;gap:clamp(34px,4.5vw,56px);
  grid-template-columns:minmax(0,1fr);
  align-items:start;
}
.contact-info .kicker::after{left:0;transform:none;}
.contact-info h2{font-size:clamp(1.45rem,2.9vw,2.05rem);margin-top:4px;}

.contact-list{margin:34px 0 0;display:grid;gap:0;}
.contact-list > div{
  display:grid;grid-template-columns:104px minmax(0,1fr);gap:16px;
  padding:16px 0;border-bottom:1px solid var(--line);
}
.contact-list dt{
  font-size:.8rem;font-weight:700;letter-spacing:.16em;color:var(--gold);
}
.contact-list dd{margin:0;font-size:.94rem;color:var(--ink-soft);word-break:break-word;}
.contact-list a{color:var(--navy-2);font-weight:500;border-bottom:1px solid var(--line-gold);}
.contact-list a:hover{color:var(--gold);}

.contact-form{
  display:grid;gap:18px;
  grid-template-columns:repeat(auto-fit,minmax(210px,1fr));
  padding:clamp(26px,3.4vw,40px);
  background:#fff;border:1px solid var(--line);
  border-radius:var(--r-lg);box-shadow:var(--shadow);
}
.field{display:flex;flex-direction:column;gap:8px;min-width:0;}
.field-full{grid-column:1/-1;}
.field label{
  font-size:.82rem;font-weight:700;letter-spacing:.1em;color:var(--navy);
}
.field label span{color:var(--gold);}
.field input,.field select,.field textarea{
  width:100%;
  font-family:var(--sans);font-size:.95rem;color:var(--ink);
  padding:13px 15px;border-radius:10px;
  border:1px solid var(--line);background:#FAFBFC;
  transition:border-color .25s var(--ease),background .25s var(--ease),box-shadow .25s var(--ease);
}
.field textarea{resize:vertical;line-height:1.8;}
.field input::placeholder,.field textarea::placeholder{color:var(--gray);opacity:.75;}
.field input:focus,.field select:focus,.field textarea:focus{
  outline:none;background:#fff;
  border-color:var(--gold);
  box-shadow:0 0 0 3px rgba(199,154,59,.16);
}
.field input[aria-invalid="true"],.field textarea[aria-invalid="true"]{
  border-color:#C0563F;box-shadow:0 0 0 3px rgba(192,86,63,.13);
}
.form-actions{
  flex-direction:row;flex-wrap:wrap;align-items:center;gap:16px;
  margin-top:4px;
}
.form-note{font-size:.82rem;color:var(--gray);flex:1 1 220px;line-height:1.7;}
.form-note.is-error{color:#C0563F;font-weight:500;}
.form-note.is-ok{color:#2F7D5B;font-weight:500;}

/* ---------------------------------------------------------
   Footer
   --------------------------------------------------------- */
.site-footer{
  background:linear-gradient(180deg,#0C2142,var(--navy));
  color:rgba(255,255,255,.72);
  padding-top:clamp(48px,6vw,68px);
}
.footer-inner{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:26px;padding-bottom:34px;
}
.footer-brand{display:flex;align-items:center;gap:14px;}
.footer-brand img{width:46px;height:46px;flex:none;}
.footer-brand div{display:flex;flex-direction:column;line-height:1.35;}
.footer-brand strong{
  font-family:var(--serif);font-size:1.06rem;color:#fff;letter-spacing:.08em;
}
.footer-brand span{font-size:.62rem;letter-spacing:.22em;color:var(--gold-2);}
.footer-tag{
  font-size:.86rem;letter-spacing:.14em;color:var(--gold-2);
  flex:1 1 260px;text-align:center;
}
.footer-nav{display:flex;flex-wrap:wrap;gap:8px 22px;}
.footer-nav a{font-size:.88rem;transition:color .25s var(--ease);}
.footer-nav a:hover{color:var(--gold-2);}

.footer-bottom{
  border-top:1px solid rgba(255,255,255,.1);
  padding-block:20px 24px;text-align:center;
}
.footer-bottom small{font-size:.78rem;color:rgba(255,255,255,.5);letter-spacing:.06em;}

/* ---------------------------------------------------------
   Reveal on scroll
   --------------------------------------------------------- */
.reveal{
  opacity:0;transform:translateY(26px);
  transition:opacity .8s var(--ease),transform .8s var(--ease);
}
.reveal.is-in{opacity:1;transform:none;}

/* ---------------------------------------------------------
   Responsive
   --------------------------------------------------------- */
@media (min-width:900px){
  .why-wrap{grid-template-columns:repeat(2,minmax(0,1fr));}
  .contact-wrap{grid-template-columns:minmax(0,.88fr) minmax(0,1.12fr);}
}

@media (max-width:860px){
  .nav-toggle{display:flex;}
  .site-header{background:rgba(17,43,78,.94);backdrop-filter:blur(14px);}

  .nav{
    position:fixed;inset:76px 0 auto 0;
    flex-direction:column;align-items:stretch;gap:0;
    /* 不透明底色：即使瀏覽器不支援 backdrop-filter，選單文字仍清晰可讀 */
    background:#0C2142;
    border-top:1px solid var(--line-gold);
    padding:10px clamp(20px,5vw,40px) 26px;
    max-height:calc(100dvh - 76px);overflow-y:auto;
    transform:translateY(-14px);opacity:0;visibility:hidden;pointer-events:none;
    transition:opacity .3s var(--ease),transform .3s var(--ease),visibility .3s;
  }
  .nav.is-open{transform:none;opacity:1;visibility:visible;pointer-events:auto;}
  .nav a{
    padding:15px 4px;border-bottom:1px solid rgba(255,255,255,.09);
    font-size:1rem;
  }
  .nav a::after{display:none;}
  .nav .nav-cta{
    margin-top:18px;text-align:center;border-bottom:1px solid var(--line-gold);
  }
}

@media (max-width:560px){
  html{scroll-padding-top:80px;}
  .hero h1{max-width:100%;}
  .contact-list > div{grid-template-columns:1fr;gap:4px;}
  .footer-inner{flex-direction:column;text-align:center;}
  .footer-tag{text-align:center;}
  .footer-nav{justify-content:center;}
  .btn{width:100%;}
  .form-actions .btn{width:auto;flex:1 1 160px;}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.01ms !important;
    transition-duration:.01ms !important;
  }
  .reveal{opacity:1;transform:none;}
}

@media print{
  .site-header,.nav-toggle,.hero-bg,.contact-form,.btn-row{display:none !important;}
  body{background:#fff;color:#000;}
  .reveal{opacity:1;transform:none;}
}