/* ==========================================================================
   拾夜科技 ShyeTech — Design tokens
   Palette: deep night navy + single warm amber "lamplight" accent
   Type: Noto Serif TC (display) / Noto Sans TC (body) / JetBrains Mono (utility)
   ========================================================================== */

:root{
  --bg-950:#0A0E1A;
  --bg-900:#10152A;
  --bg-850:#161B33;
  --bg-800:#1C2240;

  --ink-100:#EDEFF7;
  --ink-300:#C3C8DC;
  --ink-400:#8891AC;
  --ink-600:#5B6382;

  --amber-300:#F6C57C;
  --amber-400:#F0A94E;
  --amber-500:#D9902E;

  --line-800:rgba(237,239,247,0.09);
  --line-700:rgba(237,239,247,0.16);

  --font-display:'Noto Serif TC', 'Georgia', serif;
  --font-body:'Noto Sans TC', 'PingFang TC', 'Microsoft JhengHei', sans-serif;
  --font-mono:'JetBrains Mono', ui-monospace, SFMono-Regular, monospace;

  --wrap-max:1120px;
  --radius-lg:20px;
  --radius-md:14px;
  --radius-sm:8px;

  --ease:cubic-bezier(.22,.68,0,1);
}

@media (prefers-reduced-motion: reduce){
  *{ animation-duration:0.001ms !important; animation-iteration-count:1 !important; transition-duration:0.001ms !important; scroll-behavior:auto !important; }
}

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

html{ scroll-behavior:smooth; }

body{
  margin:0;
  background:var(--bg-950);
  color:var(--ink-100);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

::selection{ background:var(--amber-400); color:var(--bg-950); }

a{ color:inherit; text-decoration:none; }

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

.wrap{
  max-width:var(--wrap-max);
  margin:0 auto;
  padding:0 24px;
}
.wrap-narrow{ max-width:820px; }

.skip-link{
  position:absolute; left:-999px; top:0;
  background:var(--amber-400); color:var(--bg-950);
  padding:10px 16px; z-index:1000; border-radius:0 0 8px 0;
  font-family:var(--font-mono); font-size:13px;
}
.skip-link:focus{ left:0; }

:focus-visible{
  outline:2px solid var(--amber-400);
  outline-offset:3px;
  border-radius:4px;
}

/* ---------- Ambient starfield (decorative, behind everything) ---------- */
.stage{
  position:fixed; inset:0;
  z-index:0;
  pointer-events:none;
  background:
    radial-gradient(ellipse 60% 40% at 78% 8%, rgba(240,169,78,0.10), transparent 60%),
    radial-gradient(ellipse 80% 60% at 20% 100%, rgba(90,110,180,0.08), transparent 60%),
    var(--bg-950);
}
.stage .star{
  position:absolute;
  width:2px; height:2px;
  border-radius:50%;
  background:var(--ink-100);
  opacity:.5;
  animation:twinkle 5s ease-in-out infinite;
}
@keyframes twinkle{
  0%,100%{ opacity:.15; }
  50%{ opacity:.85; }
}

/* ---------- Header ---------- */
.site-header{
  position:fixed; top:0; left:0; right:0; z-index:100;
  background:rgba(10,14,26,0.7);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid transparent;
  transition:border-color .3s var(--ease), background .3s var(--ease);
}
.site-header.scrolled{
  border-bottom-color:var(--line-800);
  background:rgba(10,14,26,0.92);
}
.header-row{
  display:flex; align-items:center; gap:24px;
  height:76px;
}
.logo{
  display:flex; flex-direction:column; line-height:1.1;
  margin-right:auto;
}
.logo-main{
  font-family:var(--font-display);
  font-weight:700; font-size:19px; letter-spacing:.02em;
  color:var(--ink-100);
}
.logo-sub{
  font-family:var(--font-mono);
  font-size:10.5px; letter-spacing:.18em;
  color:var(--amber-400);
  text-transform:uppercase;
}
.nav{ display:flex; gap:32px; }
.nav a{
  font-size:14.5px; color:var(--ink-300);
  position:relative; padding:4px 0;
  transition:color .2s var(--ease);
}
.nav a::after{
  content:''; position:absolute; left:0; right:100%; bottom:-2px; height:1px;
  background:var(--amber-400);
  transition:right .25s var(--ease);
}
.nav a:hover{ color:var(--ink-100); }
.nav a:hover::after{ right:0; }

.btn{
  display:inline-flex; align-items:center; justify-content:center;
  padding:11px 22px;
  border-radius:999px;
  font-size:14.5px; font-weight:500;
  border:1px solid transparent;
  cursor:pointer;
  transition:transform .2s var(--ease), background .2s var(--ease), border-color .2s var(--ease), color .2s var(--ease);
  white-space:nowrap;
}
.btn-primary{
  background:var(--amber-400); color:var(--bg-950);
}
.btn-primary:hover{ background:var(--amber-300); transform:translateY(-1px); }
.btn-ghost{
  border-color:var(--line-700); color:var(--ink-100);
  background:transparent;
}
.btn-ghost:hover{ border-color:var(--amber-400); color:var(--amber-400); }

.nav-cta{ flex-shrink:0; }

.menu-toggle{
  display:none;
  flex-direction:column; justify-content:center; gap:5px;
  width:38px; height:38px;
  background:transparent; border:1px solid var(--line-700); border-radius:8px;
  cursor:pointer;
}
.menu-toggle span{
  display:block; width:16px; height:1.5px; margin:0 auto;
  background:var(--ink-100);
  transition:transform .25s var(--ease), opacity .25s var(--ease);
}
.menu-toggle[aria-expanded="true"] span:nth-child(1){ transform:translateY(6.5px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] span:nth-child(2){ opacity:0; }
.menu-toggle[aria-expanded="true"] span:nth-child(3){ transform:translateY(-6.5px) rotate(-45deg); }

.mobile-nav{
  display:none;
  flex-direction:column;
  background:rgba(10,14,26,0.98);
  border-bottom:1px solid var(--line-800);
}
.mobile-nav.open{ display:flex; }
.mobile-nav a{
  padding:16px 24px;
  border-top:1px solid var(--line-800);
  font-size:15px; color:var(--ink-300);
}
.mobile-nav a:hover{ color:var(--amber-400); }

@media (max-width:860px){
  .nav, .nav-cta{ display:none; }
  .menu-toggle{ display:flex; }
}

/* ---------- Hero ---------- */
.hero{
  position:relative;
  min-height:100svh;
  display:flex; align-items:center;
  padding-top:76px;
  z-index:1;
}
.hero-wrap{ max-width:760px; padding-top:40px; padding-bottom:40px; }

.eyebrow{
  font-family:var(--font-mono);
  font-size:12.5px; letter-spacing:.18em; text-transform:uppercase;
  color:var(--amber-400);
  margin:0 0 20px;
  display:flex; align-items:center; gap:10px;
}
.eyebrow::before{
  content:''; width:24px; height:1px; background:var(--amber-400);
}

.hero-headline{
  font-family:var(--font-display);
  font-weight:600;
  font-size:clamp(32px, 5.6vw, 54px);
  line-height:1.35;
  margin:0 0 26px;
  color:var(--ink-100);
}
.hero-headline .accent{ color:var(--amber-400); }

.hero-sub{
  font-size:16.5px; color:var(--ink-300);
  max-width:56ch;
  margin:0 0 36px;
}

.hero-cta-row{ display:flex; gap:14px; flex-wrap:wrap; margin-bottom:36px; }

.hero-chips{
  list-style:none; margin:0; padding:0;
  display:flex; flex-wrap:wrap; gap:10px;
}
.hero-chips li{
  font-family:var(--font-mono);
  font-size:12px; letter-spacing:.03em;
  color:var(--ink-400);
  border:1px solid var(--line-700);
  border-radius:999px;
  padding:7px 14px;
}
.hero-chips li::before{ content:'✦ '; color:var(--amber-400); }

.hero-scroll-cue{
  position:absolute; left:24px; bottom:34px;
  width:1px; height:52px;
  background:var(--line-700);
  overflow:hidden;
}
.hero-scroll-cue span{
  display:block; width:100%; height:16px;
  background:var(--amber-400);
  animation:scrollcue 2.2s ease-in-out infinite;
}
@keyframes scrollcue{
  0%{ transform:translateY(-20px); }
  100%{ transform:translateY(60px); }
}
@media (max-width:640px){ .hero-scroll-cue{ display:none; } }

/* ---------- Sections ---------- */
.section{ position:relative; z-index:1; padding:112px 0; }
.section-alt{ background:linear-gradient(180deg, transparent, rgba(255,255,255,0.015) 12%, rgba(255,255,255,0.015) 88%, transparent); }

.section-head{ max-width:640px; margin:0 0 56px; }
.section-title{
  font-family:var(--font-display);
  font-weight:600;
  font-size:clamp(26px, 3.4vw, 36px);
  margin:0 0 16px;
  color:var(--ink-100);
}
.section-sub{ color:var(--ink-400); margin:0; font-size:15.5px; max-width:52ch; }

/* ---------- Services ---------- */
.service-grid{
  display:grid;
  grid-template-columns:repeat(3, 1fr);
  gap:1px;
  background:var(--line-800);
  border:1px solid var(--line-800);
  border-radius:var(--radius-lg);
  overflow:hidden;
}
.service-card{
  background:var(--bg-950);
  padding:34px 30px;
  transition:background .25s var(--ease);
}
.service-card:hover{ background:var(--bg-900); }
.service-tag{
  font-family:var(--font-mono);
  font-size:12px; color:var(--amber-400);
  letter-spacing:.1em;
  margin-bottom:18px;
  display:block;
}
.service-card h3{
  font-family:var(--font-display);
  font-size:19px; font-weight:600;
  margin:0 0 12px;
}
.service-card p{
  color:var(--ink-400); font-size:14.5px;
  margin:0 0 18px;
}
.service-points{
  list-style:none; margin:0; padding:0;
  display:flex; flex-direction:column; gap:8px;
}
.service-points li{
  font-size:13px; color:var(--ink-300);
  padding-left:16px; position:relative;
}
.service-points li::before{
  content:''; position:absolute; left:0; top:8px;
  width:5px; height:1px; background:var(--amber-400);
}

@media (max-width:900px){ .service-grid{ grid-template-columns:1fr 1fr; } }
@media (max-width:620px){ .service-grid{ grid-template-columns:1fr; } }

/* ---------- Process: constellation ---------- */
.constellation{
  position:relative;
  display:grid;
  grid-template-columns:repeat(5, 1fr);
  gap:0;
  padding-top:8px;
}
.constellation::before{
  content:'';
  position:absolute;
  top:29px; left:10%; right:10%;
  height:1px;
  background:linear-gradient(90deg, transparent, var(--line-700) 8%, var(--line-700) 92%, transparent);
}
.const-node{
  position:relative;
  padding:0 16px;
  text-align:left;
}
.const-star{
  width:14px; height:14px;
  border-radius:50%;
  background:var(--bg-900);
  border:1px solid var(--amber-400);
  position:relative;
  margin-bottom:26px;
  box-shadow:0 0 0 4px var(--bg-950);
}
.const-star::after{
  content:'';
  position:absolute; inset:3px;
  border-radius:50%;
  background:var(--amber-400);
}
.const-step{
  font-family:var(--font-mono);
  font-size:11.5px; letter-spacing:.1em;
  color:var(--amber-400);
  display:block; margin-bottom:8px;
}
.const-node h3{
  font-family:var(--font-display);
  font-size:17px; font-weight:600;
  margin:0 0 10px;
}
.const-node p{
  font-size:13.5px; color:var(--ink-400);
  margin:0;
}

@media (max-width:900px){
  .constellation{ grid-template-columns:1fr; gap:36px; }
  .constellation::before{
    top:0; bottom:0; left:6px; right:auto; width:1px; height:auto;
    background:linear-gradient(180deg, transparent, var(--line-700) 6%, var(--line-700) 94%, transparent);
  }
  .const-node{ padding-left:30px; }
  .const-star{ position:absolute; left:0; top:2px; margin:0; }
}

/* ---------- Advantages ---------- */
.advantage-grid{
  display:grid;
  grid-template-columns:repeat(2, 1fr);
  gap:20px;
}
.advantage-card{
  border:1px solid var(--line-800);
  border-radius:var(--radius-md);
  padding:28px;
  background:var(--bg-900);
}
.advantage-card h3{
  font-family:var(--font-display);
  font-size:18px; font-weight:600;
  margin:0 0 10px;
  color:var(--amber-300);
}
.advantage-card p{
  margin:0; color:var(--ink-300); font-size:14.5px;
}
@media (max-width:700px){ .advantage-grid{ grid-template-columns:1fr; } }

/* ---------- FAQ ---------- */
.faq-list{ border-top:1px solid var(--line-800); }
.faq-item{ border-bottom:1px solid var(--line-800); }
.faq-q{
  width:100%; text-align:left;
  background:none; border:none; cursor:pointer;
  display:flex; align-items:center; justify-content:space-between; gap:20px;
  padding:22px 4px;
  font-family:var(--font-body);
  font-size:16px; font-weight:500; color:var(--ink-100);
}
.faq-q .plus{
  font-family:var(--font-mono);
  font-size:18px; color:var(--amber-400);
  flex-shrink:0;
  transition:transform .25s var(--ease);
}
.faq-item[aria-expanded="true"] .plus{ transform:rotate(45deg); }
.faq-a{
  max-height:0; overflow:hidden;
  transition:max-height .3s var(--ease), padding .3s var(--ease);
  padding:0 4px;
}
.faq-a p{ margin:0 0 20px; color:var(--ink-400); font-size:14.5px; max-width:68ch; }
.faq-item[aria-expanded="true"] .faq-a{ max-height:300px; }

/* ---------- Contact ---------- */
.contact-wrap{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:64px;
  align-items:start;
}
.contact-facts{
  margin:32px 0 24px;
  display:grid; gap:14px;
}
.contact-facts div{ display:flex; gap:14px; }
.contact-facts dt{
  font-family:var(--font-mono);
  font-size:11.5px; letter-spacing:.08em; text-transform:uppercase;
  color:var(--amber-400);
  width:100px; flex-shrink:0; padding-top:2px;
}
.contact-facts dd{ margin:0; color:var(--ink-300); font-size:14.5px; }

.social-list{ list-style:none; display:flex; gap:10px; padding:0; margin:0; flex-wrap:wrap; }
.social-list a{
  font-size:13px; color:var(--ink-300);
  border:1px solid var(--line-700); border-radius:999px;
  padding:8px 16px;
  transition:border-color .2s var(--ease), color .2s var(--ease);
}
.social-list a:hover{ border-color:var(--amber-400); color:var(--amber-400); }

.contact-form{
  background:var(--bg-900);
  border:1px solid var(--line-800);
  border-radius:var(--radius-lg);
  padding:36px;
  display:flex; flex-direction:column; gap:18px;
}
.field{ display:flex; flex-direction:column; gap:8px; }
.field label{
  font-family:var(--font-mono);
  font-size:11.5px; letter-spacing:.08em; text-transform:uppercase;
  color:var(--ink-400);
}
.field input, .field select, .field textarea{
  background:var(--bg-950);
  border:1px solid var(--line-700);
  border-radius:var(--radius-sm);
  padding:12px 14px;
  color:var(--ink-100);
  font-family:var(--font-body);
  font-size:14.5px;
  resize:vertical;
}
.field input:focus, .field select:focus, .field textarea:focus{
  border-color:var(--amber-400);
  outline:none;
}
.form-submit{ margin-top:6px; }
.form-note{ font-size:12.5px; color:var(--ink-600); margin:0; }

@media (max-width:860px){
  .contact-wrap{ grid-template-columns:1fr; gap:40px; }
}

/* ---------- Footer ---------- */
.site-footer{
  position:relative; z-index:1;
  border-top:1px solid var(--line-800);
  padding:64px 0 32px;
  background:var(--bg-900);
}
.footer-wrap{
  display:grid;
  grid-template-columns:1.2fr 2fr;
  gap:48px;
  padding-bottom:40px;
  border-bottom:1px solid var(--line-800);
}
.footer-tagline{
  color:var(--ink-400); font-size:14px;
  margin:14px 0 0; max-width:32ch;
}
.footer-columns{ display:flex; gap:64px; flex-wrap:wrap; }
.footer-col h4{
  font-family:var(--font-mono);
  font-size:11.5px; letter-spacing:.1em; text-transform:uppercase;
  color:var(--amber-400);
  margin:0 0 16px;
}
.footer-col ul{ list-style:none; margin:0; padding:0; display:flex; flex-direction:column; gap:10px; }
.footer-col a{ font-size:14px; color:var(--ink-300); }
.footer-col a:hover{ color:var(--ink-100); }

.footer-legal{ padding-top:28px; }
.footer-legal p{ margin:0 0 6px; font-size:13px; color:var(--ink-400); }
.footer-note{ color:var(--ink-600); font-size:12px; }

.copyright{
  margin:24px 0 0;
  font-size:12px; color:var(--ink-600);
  font-family:var(--font-mono);
}

@media (max-width:700px){
  .footer-wrap{ grid-template-columns:1fr; }
  .footer-columns{ gap:36px; }
}