/* ==========================================================
   BASEVEC LIMITED — 官網樣式
   主題：深空底色 + 向量綠光，技術感、克制而鋒利
   ========================================================== */

:root {
  --bg: #080b12;
  --bg-soft: #0d1220;
  --ink: #e8edf5;
  --ink-dim: #8b96aa;
  --accent: #00e5a0;
  --accent-dim: rgba(0, 229, 160, 0.14);
  --line: rgba(139, 150, 170, 0.18);
  --font-display: "Unbounded", "Noto Sans TC", sans-serif;
  --font-body: "Noto Sans TC", sans-serif;
  --font-mono: "IBM Plex Mono", monospace;
  --maxw: 1120px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-weight: 300;
  line-height: 1.75;
  letter-spacing: 0.01em;
  overflow-x: hidden;
}

::selection { background: var(--accent); color: var(--bg); }

.mono { font-family: var(--font-mono); }

/* ---------- 背景層：向量場畫布 + 噪點 ---------- */
#vector-field {
  position: fixed;
  inset: 0;
  z-index: 0;
  display: block;
}

.grain {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: 0.35;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3CfeColorMatrix values='0 0 0 0 0  0 0 0 0 0  0 0 0 0 0  0 0 0 0.05 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

header, main, footer { position: relative; z-index: 2; }

/* ---------- 頂欄 ---------- */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem clamp(1.25rem, 4vw, 3rem);
  background: linear-gradient(rgba(8, 11, 18, 0.92), rgba(8, 11, 18, 0.6) 70%, transparent);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
  text-decoration: none;
  color: var(--ink);
}

.brand-mark {
  width: 22px; height: 22px;
  align-self: center;
}
.brand-mark path {
  fill: none;
  stroke: var(--accent);
  stroke-width: 3;
}

.brand-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.06em;
}

.brand-suffix {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.28em;
  color: var(--ink-dim);
}

.site-nav { display: flex; gap: clamp(1rem, 3vw, 2.4rem); }

.site-nav a {
  color: var(--ink);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 400;
  position: relative;
  padding-bottom: 2px;
}
.site-nav a span {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  color: var(--ink-dim);
  letter-spacing: 0.12em;
  margin-left: 0.2rem;
}
.site-nav a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -2px;
  width: 0; height: 1px;
  background: var(--accent);
  transition: width 0.3s ease;
}
.site-nav a:hover::after { width: 100%; }

/* ---------- Hero ---------- */
.hero {
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 7rem clamp(1.25rem, 6vw, 5rem) 4rem;
  max-width: var(--maxw);
  margin: 0 auto;
  position: relative;
}

.hero-eyebrow {
  font-size: 0.72rem;
  letter-spacing: 0.32em;
  color: var(--accent);
  margin-bottom: 1.6rem;
}

.hero-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.2rem, 7vw, 5rem);
  line-height: 1.18;
  letter-spacing: 0.02em;
}
.hero-title span { display: block; }
.hero-title .accent {
  color: var(--accent);
  text-shadow: 0 0 48px rgba(0, 229, 160, 0.45);
}

.hero-sub {
  margin-top: 2rem;
  max-width: 34em;
  color: var(--ink-dim);
  font-size: clamp(0.95rem, 1.4vw, 1.08rem);
}

.hero-cta {
  margin-top: 2.6rem;
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 0.85rem 2rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.14em;
  text-decoration: none;
  border: 1px solid var(--accent);
  transition: all 0.25s ease;
}
.btn-primary {
  background: var(--accent);
  color: var(--bg);
  font-weight: 500;
}
.btn-primary:hover {
  background: transparent;
  color: var(--accent);
  box-shadow: 0 0 28px rgba(0, 229, 160, 0.25);
}
.btn-ghost {
  color: var(--ink);
  border-color: var(--line);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

.hero-meta {
  margin-top: 4rem;
  display: flex;
  gap: 2.2rem;
  flex-wrap: wrap;
  font-size: 0.66rem;
  letter-spacing: 0.22em;
  color: var(--ink-dim);
}
.hero-meta span { position: relative; padding-left: 1rem; }
.hero-meta span::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--accent);
}

.scroll-hint {
  position: absolute;
  bottom: 2rem;
  left: clamp(1.25rem, 6vw, 5rem);
  font-size: 0.62rem;
  letter-spacing: 0.3em;
  color: var(--ink-dim);
  animation: hint-bob 2.4s ease-in-out infinite;
}
@keyframes hint-bob {
  0%, 100% { transform: translateY(0); opacity: 0.6; }
  50% { transform: translateY(6px); opacity: 1; }
}

/* ---------- 通用 Section ---------- */
.section {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(4rem, 10vw, 7.5rem) clamp(1.25rem, 6vw, 5rem);
}

.section-head {
  display: flex;
  align-items: baseline;
  gap: 1.2rem;
  margin-bottom: clamp(2.5rem, 6vw, 4rem);
  border-bottom: 1px solid var(--line);
  padding-bottom: 1.2rem;
}

.section-no {
  color: var(--accent);
  font-size: 0.8rem;
  letter-spacing: 0.2em;
}

.section-head h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.4rem, 3.2vw, 2.1rem);
  letter-spacing: 0.03em;
}
.section-head h2 em {
  font-family: var(--font-mono);
  font-style: normal;
  font-weight: 400;
  font-size: 0.55em;
  color: var(--ink-dim);
  letter-spacing: 0.12em;
  margin-left: 0.5rem;
}

/* ---------- 旗艦產品 ClawTroop ---------- */
.product-hero {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  margin-bottom: clamp(2.5rem, 6vw, 4rem);
  border: 1px solid var(--line);
  background:
    radial-gradient(ellipse 80% 120% at 100% 0%, rgba(0, 229, 160, 0.07), transparent 60%),
    linear-gradient(160deg, var(--bg-soft), rgba(13, 18, 32, 0.5));
  padding: clamp(1.8rem, 4vw, 3rem);
}

.product-tag {
  font-size: 0.66rem;
  letter-spacing: 0.28em;
  color: var(--accent);
  margin-bottom: 1.2rem;
}

.product-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.8rem, 4.5vw, 2.8rem);
  letter-spacing: 0.02em;
  line-height: 1.2;
}
.product-name .zh-name {
  font-size: 0.5em;
  font-weight: 500;
  color: var(--ink-dim);
  margin-left: 0.4rem;
  letter-spacing: 0.14em;
}

.product-slogan {
  margin-top: 0.8rem;
  font-size: clamp(1rem, 2vw, 1.25rem);
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.2em;
}

.product-desc {
  margin-top: 1.2rem;
  color: var(--ink-dim);
  font-size: 0.95rem;
  max-width: 34em;
}

.product-cta {
  margin-top: 2rem;
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.product-steps {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 1.2rem;
  border-left: 1px dashed var(--line);
  padding-left: clamp(1.2rem, 3vw, 2.2rem);
}

.pstep {
  display: flex;
  gap: 0.9rem;
  align-items: flex-start;
}
.pstep-no {
  flex-shrink: 0;
  width: 1.6rem; height: 1.6rem;
  display: grid;
  place-items: center;
  border: 1px solid var(--accent);
  color: var(--accent);
  font-size: 0.75rem;
  border-radius: 50%;
}
.pstep strong {
  display: block;
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.92rem;
  letter-spacing: 0.04em;
}
.pstep p {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 0.78rem;
  color: var(--ink-dim);
  margin-top: 0.2rem;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.feature-item {
  background: var(--bg);
  padding: 1.6rem 1.5rem;
  transition: background 0.3s ease;
}
.feature-item:hover { background: var(--bg-soft); }
.feature-item h4 {
  font-weight: 500;
  font-size: 1rem;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
  position: relative;
  padding-left: 1rem;
}
.feature-item h4::before {
  content: "";
  position: absolute;
  left: 0; top: 0.35em;
  width: 6px; height: 6px;
  background: var(--accent);
}
.feature-item p {
  font-size: 0.84rem;
  color: var(--ink-dim);
}

/* ---------- 服務卡片 ---------- */
.service-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
}

.service-card {
  border: 1px solid var(--line);
  background: linear-gradient(160deg, var(--bg-soft), rgba(13, 18, 32, 0.4));
  padding: 2rem 1.8rem 2.2rem;
  position: relative;
  overflow: hidden;
  transition: border-color 0.3s ease, transform 0.3s ease;
}
.service-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 2px;
  background: linear-gradient(90deg, var(--accent), transparent 60%);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}
.service-card:hover {
  border-color: rgba(0, 229, 160, 0.45);
  transform: translateY(-4px);
}
.service-card:hover::before { transform: scaleX(1); }

.card-index {
  color: var(--accent);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  margin-bottom: 1.4rem;
}

.service-card h3 {
  font-weight: 500;
  font-size: 1.18rem;
  letter-spacing: 0.04em;
}

.card-en {
  font-size: 0.62rem;
  letter-spacing: 0.24em;
  color: var(--ink-dim);
  margin: 0.4rem 0 1.1rem;
}

.service-card > p:not(.card-en) {
  color: var(--ink-dim);
  font-size: 0.92rem;
}

.service-card ul {
  margin-top: 1.4rem;
  list-style: none;
  font-size: 0.78rem;
  color: var(--ink);
}
.service-card li {
  padding: 0.5rem 0;
  border-top: 1px dashed var(--line);
}
.service-card li::before {
  content: "▸ ";
  color: var(--accent);
}

/* ---------- 關於 ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
}

.about-lead {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.1rem, 2.4vw, 1.5rem);
  line-height: 1.6;
  color: var(--accent);
  margin-bottom: 1.6rem;
}

.about-copy p:not(.about-lead) {
  color: var(--ink-dim);
  margin-bottom: 1.2rem;
  max-width: 36em;
}

.about-facts {
  border-left: 1px solid var(--line);
  padding-left: clamp(1.2rem, 3vw, 2.4rem);
  align-self: start;
}
.about-facts div {
  padding: 1rem 0;
  border-bottom: 1px dashed var(--line);
}
.about-facts dt {
  font-size: 0.62rem;
  letter-spacing: 0.24em;
  color: var(--accent);
  margin-bottom: 0.3rem;
}
.about-facts dd { font-size: 0.95rem; font-weight: 400; }

/* ---------- 聯絡 ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
}

.contact-block {
  border: 1px solid var(--line);
  background: var(--bg-soft);
  padding: 2rem 1.8rem;
}
.contact-block h3 {
  font-size: 0.66rem;
  letter-spacing: 0.26em;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 0.8rem;
}
.contact-block h3 + p { margin-bottom: 1.6rem; font-weight: 400; }
.contact-block p:last-child { margin-bottom: 0; }
.contact-block .zh { color: var(--ink-dim); font-size: 0.88rem; }

.contact-link {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--accent);
  transition: color 0.25s ease;
}
.contact-link:hover { color: var(--accent); }

/* ---------- 頁腳 ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  margin-top: 3rem;
  padding: 2.2rem clamp(1.25rem, 6vw, 5rem);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.footer-brand {
  font-size: 0.78rem;
  letter-spacing: 0.3em;
  color: var(--accent);
}

.footer-meta {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
  font-size: 0.66rem;
  letter-spacing: 0.1em;
  color: var(--ink-dim);
}

/* ---------- 滾動漸顯 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.8s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.8s cubic-bezier(0.22, 1, 0.36, 1);
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .scroll-hint { animation: none; }
}

/* ---------- 響應式 ---------- */
@media (max-width: 760px) {
  .about-grid { grid-template-columns: 1fr; }
  .product-hero { grid-template-columns: 1fr; }
  .product-steps { border-left: none; padding-left: 0; border-top: 1px dashed var(--line); padding-top: 1.6rem; }
  .about-facts { border-left: none; padding-left: 0; }
  .site-nav a span { display: none; }
  .scroll-hint { display: none; }
}