/* 工業技術風：白底＋淺灰區塊、無襯線粗體、鈦藍強調 */
:root {
  --paper: #ffffff;
  --paper-2: #f2f4f7;      /* 淺灰區塊 */
  --white: #ffffff;
  --ink: #1a1f29;
  --ink-2: #4a5260;
  --mute: #7d8592;
  --rule: #dde1e7;
  --ti: #1f4e8c;           /* 鈦藍 */
  --ti-deep: #14325c;
  --ti-light: #e8eef7;
  --max: 1200px;
  --sans: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", system-ui, sans-serif;
  --serif: var(--sans);    /* 統一使用無襯線字 */
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body { font-family: var(--sans); background: var(--paper); color: var(--ink); line-height: 1.85; -webkit-font-smoothing: antialiased; }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 28px; }

/* Header */
.site-header { position: fixed; inset: 0 0 auto 0; z-index: 50; background: rgba(255,255,255,.96); backdrop-filter: blur(8px); border-bottom: 1px solid var(--rule); }
.nav { display: flex; align-items: center; justify-content: space-between; height: 64px; }
/* Logo：C5 切角標誌＋文字標與陽極色帶 */
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); }
.brand-mark { width: 40px; height: 40px; fill: var(--ti); flex: none; }
.brand-word { display: block; }
.brand-word b { display: block; font-weight: 900; font-size: 19px; letter-spacing: .16em; line-height: 1.15; }
.brand-word i { display: block; height: 3px; margin: 4px 0 3px; background: linear-gradient(90deg, #c9a24a, #7d4fa0 50%, #2f6fb5); }
.brand-word small { display: block; font-family: "Inter", var(--sans); font-weight: 700; font-size: 8px; letter-spacing: .26em; color: var(--mute); line-height: 1.2; white-space: nowrap; }
.menu { display: flex; gap: 32px; list-style: none; align-items: center; }
.menu a { font-size: 15px; font-weight: 500; letter-spacing: .08em; color: var(--ink-2); padding: 20px 0; border-bottom: 3px solid transparent; transition: .2s; }
.menu a:hover { color: var(--ti); border-color: var(--ti); }
.menu a.lang { border: 1px solid var(--rule); padding: 4px 12px; font-size: 12px; }
.menu a.lang:hover { background: var(--ti); color: #fff; border-color: var(--ti); }
.burger { display: none; background: none; border: 0; font-size: 24px; color: var(--ink); cursor: pointer; }

/* Hero */
.hero { padding: 132px 0 0; background: linear-gradient(180deg, var(--paper-2) 0, var(--paper-2) calc(100% - 64px), var(--paper) calc(100% - 64px)); }
.hero-grid { display: grid; grid-template-columns: 6fr 6fr; gap: 56px; align-items: center; }
.kicker { font-size: 13px; letter-spacing: .2em; color: var(--ti); font-weight: 700; margin-bottom: 18px; }
.hero h1 { font-weight: 900; font-size: clamp(38px, 5.6vw, 68px); line-height: 1.2; letter-spacing: .04em; }
.hero h1 em { font-style: normal; color: var(--ti); }
.hero .sub { margin-top: 18px; font-weight: 700; font-size: clamp(17px, 1.8vw, 21px); letter-spacing: .1em; color: var(--ink); padding-left: 14px; border-left: 4px solid var(--ti); line-height: 1.5; }
.hero .lead { margin-top: 24px; max-width: 540px; color: var(--ink-2); font-size: 16px; }
.hero-cta { margin-top: 32px; display: flex; gap: 12px; flex-wrap: wrap; }
.btn { display: inline-block; padding: 13px 30px; font: 700 15px var(--sans); letter-spacing: .1em; border: 1px solid var(--ti); border-radius: 4px; cursor: pointer; transition: .2s; background: #fff; color: var(--ti); }
.btn:hover { background: var(--ti-light); }
.btn.solid { background: var(--ti); color: #fff; }
.btn.solid:hover { background: var(--ti-deep); border-color: var(--ti-deep); }
/* 去背產品圖：無框，直接浮在灰底上 */
.hero .specimen { position: relative; padding: 0; background: none; border: 0; border-radius: 0; }
.hero .specimen::before { content: ""; position: absolute; left: 50%; top: 46%; width: 78%; aspect-ratio: 1; transform: translate(-50%, -50%); border-radius: 50%; background: radial-gradient(circle, #fff 0, rgba(255,255,255,.7) 45%, rgba(255,255,255,0) 70%); z-index: 0; }
.hero .specimen img { position: relative; z-index: 1; height: clamp(300px, 36vw, 460px); object-fit: contain; filter: drop-shadow(0 22px 22px rgba(20,40,80,.18)); }
.hero .specimen figcaption { position: relative; z-index: 1; width: 72%; margin: 20px auto 0; letter-spacing: .14em; font-weight: 500; }

/* 規格列 */
.facts { list-style: none; display: grid; grid-template-columns: repeat(4, 1fr); margin-top: 64px; background: #fff; border: 1px solid var(--rule); border-top: 4px solid var(--ti); border-radius: 4px; box-shadow: 0 6px 24px rgba(20,40,80,.06); position: relative; }
.facts.wrap { padding: 0; width: calc(100% - 56px); max-width: calc(var(--max) - 56px); }
.facts li { padding: 22px 26px; }
.facts li + li { border-left: 1px solid var(--rule); }
.facts small { display: block; font-size: 13px; letter-spacing: .1em; color: var(--mute); }
.facts b { display: block; font-size: 24px; font-weight: 900; color: var(--ti); line-height: 1.4; margin: 2px 0; }
.facts span { font-size: 14px; color: var(--ink-2); }

/* 圖片框 */
.specimen { background: #fff; border: 1px solid var(--rule); border-radius: 4px; padding: 16px; }
.specimen img { width: 100%; }
.specimen figcaption { display: flex; justify-content: space-between; border-top: 1px solid var(--rule); margin-top: 14px; padding-top: 10px; font-size: 13px; color: var(--mute); }

/* Sections */
section { padding: 96px 0; }
.sec-title { font-size: clamp(28px, 3.4vw, 38px); font-weight: 900; line-height: 1.3; letter-spacing: .06em; display: flex; align-items: baseline; gap: 14px; flex-wrap: wrap; }
.sec-title small { font-size: 14px; font-weight: 700; letter-spacing: .2em; color: var(--ti); }
.sec-head { display: grid; grid-template-columns: 5fr 7fr; gap: 48px; align-items: end; margin-bottom: 48px; }
.sec-head > div { position: relative; padding-bottom: 18px; }
.sec-head > div::after { content: ""; position: absolute; left: 0; bottom: 0; width: 48px; height: 4px; background: var(--ti); }
.sec-intro { color: var(--ink-2); }
.sec-head .sec-intro { margin: 0; }

/* 材料 */
.mat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.mat { background: var(--paper-2); border-radius: 4px; padding: 28px 24px; }
.mat .big { font-size: 34px; font-weight: 900; color: var(--ti); line-height: 1.2; }
.mat h3 { font-size: 18px; font-weight: 700; margin: 10px 0 6px; }
.mat p { font-size: 14px; color: var(--ink-2); line-height: 1.8; }
.mat-note { margin-top: 24px; background: var(--ti); color: #e6edf8; padding: 32px 40px; border-radius: 4px; display: grid; grid-template-columns: auto 1fr; gap: 40px; align-items: center; }
.mat-note b { font-size: 24px; font-weight: 900; color: #fff; letter-spacing: .06em; line-height: 1.4; }
.mat-note p { font-size: 15px; }

/* 製程 */
.process { background: var(--paper-2); }
.flow { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; counter-reset: f; }
.flow li { list-style: none; background: #fff; border-radius: 4px; padding: 24px 20px; border-top: 4px solid var(--ti); counter-increment: f; position: relative; }
.flow li::before { content: "STEP " counter(f, decimal-leading-zero); display: block; font-size: 13px; font-weight: 700; letter-spacing: .12em; color: var(--ti); margin-bottom: 8px; }
.flow h4 { font-size: 18px; font-weight: 700; margin-bottom: 6px; }
.flow p { font-size: 14px; color: var(--ink-2); line-height: 1.8; }
.flow-foot { margin-top: 24px; font-size: 13px; color: var(--mute); }

/* 產品 */
.p-list { display: grid; gap: 24px; }
.p-item { display: grid; grid-template-columns: 5fr 7fr; gap: 48px; align-items: center; padding: 24px; border: 1px solid var(--rule); border-radius: 4px; }
.p-item .specimen { border: 0; padding: 0; }
.p-item h3 { font-size: clamp(22px, 2.4vw, 28px); font-weight: 900; margin-bottom: 10px; letter-spacing: .04em; }
.p-item p { color: var(--ink-2); max-width: 560px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.chips span { font-size: 13px; padding: 3px 14px; background: var(--ti-light); color: var(--ti); border-radius: 999px; font-weight: 500; }
.also { margin-top: 24px; padding: 32px; background: var(--paper-2); border-radius: 4px; display: grid; grid-template-columns: 5fr 7fr; gap: 48px; align-items: center; }
.also h3 { font-size: 24px; font-weight: 900; margin-bottom: 6px; }
.also p { color: var(--ink-2); font-size: 15px; }
.also-row { display: grid; grid-template-columns: 180px 1fr; gap: 24px; align-items: center; }
.also .specimen { padding: 8px; }
.also .list { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.also .list span { background: #fff; border: 1px solid var(--rule); padding: 3px 14px; font-size: 14px; border-radius: 999px; }

/* 關於 */
.about { background: var(--ti-deep); color: #fff; }
.about .sec-title small { color: #9fb8de; }
.about .sec-head > div::after { background: #fff; }
.about .sec-intro { color: #c3d0e4; }
.about-cols { display: grid; grid-template-columns: 4fr 8fr; gap: 64px; align-items: start; }
.since { font-weight: 900; font-size: clamp(64px, 9vw, 112px); line-height: 1; color: #fff; letter-spacing: .02em; }
.since-cap { margin-top: 10px; font-size: 14px; letter-spacing: .15em; color: #9fb8de; }
.about-text p { color: #d6dfec; margin-bottom: 18px; }
.about-text strong { color: #fff; }
.vals { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 56px; }
.val { background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.14); border-radius: 4px; padding: 28px; }
.val .n { font-size: 13px; font-weight: 700; letter-spacing: .15em; color: #9fb8de; }
.val h3 { font-size: 22px; font-weight: 900; margin: 4px 0 8px; }
.val p { color: #c3d0e4; font-size: 15px; }

/* 常見問題 */
.faq { border-top: 2px solid var(--ink); max-width: 920px; }
.faq details { border-bottom: 1px solid var(--rule); }
.faq summary { list-style: none; cursor: pointer; display: flex; justify-content: space-between; gap: 24px; padding: 20px 4px; font-size: 18px; font-weight: 700; }
.faq summary::before { content: "Q"; color: var(--ti); font-weight: 900; margin-right: -8px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; margin-left: auto; font-weight: 400; font-size: 24px; line-height: 1; color: var(--ti); transition: transform .25s; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq summary:hover { color: var(--ti); }
.faq details p { margin: 0 4px 20px; padding: 16px 20px; background: var(--paper-2); border-radius: 4px; color: var(--ink-2); }

/* 聯絡 */
#contact { background: var(--paper-2); }
.c-grid { display: grid; grid-template-columns: 5fr 7fr; gap: 48px; align-items: start; }
.c-list { list-style: none; background: #fff; border: 1px solid var(--rule); border-radius: 4px; padding: 8px 24px; }
.c-list li { display: grid; grid-template-columns: 92px 1fr; padding: 16px 0; }
.c-list li + li { border-top: 1px solid var(--rule); }
.c-list small { font-size: 12px; font-weight: 700; letter-spacing: .15em; color: var(--ti); padding-top: 4px; }
.c-list a:hover { color: var(--ti); text-decoration: underline; }
.c-right { display: grid; gap: 24px; }
.map { border: 1px solid var(--rule); border-radius: 4px; overflow: hidden; min-height: 260px; background: #fff; }
.map iframe { width: 100%; height: 100%; min-height: 260px; border: 0; display: block; }
.form { display: grid; gap: 12px; background: #fff; border: 1px solid var(--rule); border-top: 4px solid var(--ti); border-radius: 4px; padding: 28px; }
.form .row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.form input, .form textarea { width: 100%; padding: 12px 14px; font: inherit; font-size: 15px; background: #fff; border: 1px solid var(--rule); border-radius: 4px; color: var(--ink); }
.form input:focus, .form textarea:focus { outline: 2px solid var(--ti); outline-offset: -1px; border-color: var(--ti); }
.form .btn { justify-self: start; }
.form-title { font-size: 22px; font-weight: 900; letter-spacing: .06em; }
.form-note { font-size: 13px; color: var(--mute); }
.form-note a { color: var(--ti); text-decoration: underline; }

footer { padding: 28px 0; background: var(--ink); font-size: 13px; letter-spacing: .08em; color: #a9b0bc; }
footer .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; }

.reveal { opacity: 0; transform: translateY(16px); transition: opacity .6s, transform .6s; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; transition: none; } html { scroll-behavior: auto; } }

/* Responsive */
@media (max-width: 980px) {
  .hero-grid, .sec-head, .about-cols, .c-grid, .also, .p-item { grid-template-columns: 1fr; gap: 28px; }
  .mat-grid { grid-template-columns: repeat(2, 1fr); }
  .flow { grid-template-columns: repeat(2, 1fr); }
  .mat-note { grid-template-columns: 1fr; gap: 12px; }
  .vals { grid-template-columns: 1fr; }
  .facts { grid-template-columns: repeat(2, 1fr); margin-top: 48px; }
  .facts li:nth-child(3) { border-left: 0; }
  .facts li:nth-child(n+3) { border-top: 1px solid var(--rule); }
  .menu { gap: 22px; }
}
@media (max-width: 720px) {
  section { padding: 72px 0; }
  .wrap { padding: 0 16px; }
  .facts.wrap { width: calc(100% - 32px); }
  .hero { padding-top: 100px; }
  .burger { display: block; }
  .menu { position: absolute; top: 64px; left: 0; right: 0; background: #fff; border-bottom: 1px solid var(--rule); flex-direction: column; align-items: stretch; gap: 0; display: none; }
  .menu.open { display: flex; }
  .menu a { display: block; padding: 14px 16px; border: 0; }
  .menu a.lang { display: inline-block; margin: 8px 16px 16px; }
  .brand-mark { width: 34px; height: 34px; }
  .brand-word b { font-size: 17px; }
  .mat-grid, .flow, .facts { grid-template-columns: 1fr; }
  .facts li + li { border-left: 0; border-top: 1px solid var(--rule); }
  .form .row { grid-template-columns: 1fr; }
  .form { padding: 20px; }
  .c-list li { grid-template-columns: 80px 1fr; }
  .p-item { padding: 16px; }
  .also { padding: 20px; }
  .also-row { grid-template-columns: 1fr; }
  .faq summary { font-size: 16px; }
}