/* ===== UrKEY Studio - Common Styles ===== */

/* ---------- Reset & Variables ---------- */
*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }

:root {
  --black:#111;
  --black-soft:#111;
  --white:#fff;
  --white-muted:#f5f5f5;
  --white-soft:#fafafa;
  --muted:#71717a;
  --gray:#d4d4d8;
  --gray-dark:#71717a;
  --gray-light:#e4e4e7;
  --border:#e4e4e7;
  --bg:#fafafa;
  --radius-sm:6px;
  --radius-md:10px;
  --radius-lg:20px;
  --transition:0.3s cubic-bezier(0.4,0,0.2,1);
  --max-w:1200px;
  --section-gap:90px;
  --section-pad:90px 28px;
  --gap:28px;
  --font-display:'Noto Sans SC','Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  --font-sans:'Noto Sans SC','Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
}

html { scroll-behavior:smooth; }

body {
  font-family: 'Noto Sans SC','Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  color:var(--black);
  background:var(--bg);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

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

/* ---------- Navigation ---------- */
/* 2025-06-30 Fix: Add flex layout to .nav so logo + links + burger stay in one row */
.nav {
  position:fixed; top:0; left:0; width:100%;
  display:flex; align-items:center; justify-content:space-between;
  height:64px; padding:0 28px;
  background:rgba(255,255,255,0.88);
  backdrop-filter:blur(18px) saturate(180%);
  -webkit-backdrop-filter:blur(18px) saturate(180%);
  border-bottom:1px solid var(--border);
  z-index:1000;
  transition:var(--transition);
}

.nav.scrolled { background:rgba(255,255,255,0.95); box-shadow:0 1px 6px rgba(0,0,0,0.04); }

/* 2025-06-30: nav-left wrapper for logo + lang-switch */
.nav-left { display:flex; align-items:center; gap:0.75rem; }

/* ── Language Switch Button ── */
.lang-switch {
  display:inline-flex; align-items:center; justify-content:center;
  height:1.75rem; padding:0 0.55rem;
  border:1px solid var(--gray);
  border-radius:var(--radius-sm);
  background:transparent;
  color:var(--muted);
  font-family:var(--font-sans);
  font-size:0.65rem; font-weight:600;
  letter-spacing:0.05em;
  cursor:pointer;
  transition:all 0.25s ease;
  line-height:1; white-space:nowrap;
}
.lang-switch:hover {
  border-color:var(--black); color:var(--black);
  background:var(--white-muted);
}

.nav-container {
  max-width:var(--max-w); margin:0 auto; padding:0 28px;
  display:flex; align-items:center; justify-content:space-between;
  height:64px;
}

.nav-logo { display:flex; align-items:center; gap:10px; text-decoration:none; }
.nav-logo img { height:32px; width:auto; }
.nav-logo-text { font-size:1.15rem; font-weight:700; color:var(--black); letter-spacing:-0.02em; }

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

.lang-switch {
  padding:3px 10px;
  font-size:0.7rem;
  font-weight:600;
  color:var(--text-muted,#999);
  background:transparent;
  border:1.5px solid var(--border-color,#e0e0e0);
  border-radius:4px;
  cursor:pointer;
  transition:all 0.2s;
  line-height:1.5;
  white-space:nowrap;
}
.lang-switch:hover { color:var(--black); border-color:var(--black); }

.nav-links { display:flex; align-items:center; gap:2px; list-style:none; }

.nav-link {
  display:flex; flex-direction:column; align-items:center;
  padding:8px 16px; text-decoration:none; color:var(--muted);
  font-size:0.78rem; font-weight:500; letter-spacing:0.03em;
  border-radius:var(--radius-sm);
  transition:var(--transition); position:relative;
}
.nav-link .zh { font-size:0.85rem; }
.nav-link .en { font-size:0.62rem; opacity:0.55; margin-top:1px; text-transform:uppercase; }
.nav-link::after {
  content:''; position:absolute; bottom:4px; left:50%;
  transform:translateX(-50%) scaleX(0);
  width:18px; height:2px; border-radius:2px;
  background:var(--black);
  transition:transform var(--transition);
}
.nav-link:hover, .nav-link:focus-visible { color:var(--black); }
.nav-link:hover::after, .nav-link:focus-visible::after { transform:translateX(-50%) scaleX(1); }

.nav-link-cta {
  margin-left:6px; padding:7px 18px;
  background:var(--black); color:var(--white) !important;
  border-radius:20px; font-weight:600; font-size:0.78rem;
}
.nav-link-cta::after { display:none; }
.nav-link-cta:hover { background:#333; }

.burger {
  display:none; flex-direction:column; justify-content:center;
  width:28px; height:28px; cursor:pointer; background:none; border:none;
  gap:5px; z-index:1001;
}
.burger span {
  display:block; width:100%; height:2px;
  background:var(--black); border-radius:2px;
  transition:var(--transition);
}

@media (max-width:768px) {
  .burger { display:flex; }
  .nav-links {
    position:fixed; top:0; right:-100%; width:260px; height:100vh;
    flex-direction:column; align-items:flex-start; padding:80px 28px 28px;
    background:var(--white); border-left:1px solid var(--border);
    gap:4px; transition:var(--transition);
  }
  .nav-links.open { right:0; }
  .nav-link { width:100%; padding:12px 8px; }
  .nav-link-cta { margin-left:0; width:100%; text-align:center; margin-top:8px; }
}

/* ---------- Nav Tooltip ---------- */
.nav-tooltip {
  position:fixed; background:var(--black); color:var(--white);
  font-size:0.72rem; padding:6px 12px; border-radius:var(--radius-sm);
  pointer-events:none; opacity:0; transform:translateY(4px);
  transition:opacity 0.2s,transform 0.2s; z-index:2000;
  white-space:nowrap;
}
.nav-tooltip.show { opacity:1; transform:translateY(0); }

/* ---------- Footer ---------- */
.footer {
  background:var(--black); color:var(--white);
  padding:60px 28px 30px; margin-top:var(--section-gap);
}
.footer-grid {
  max-width:var(--max-w); margin:0 auto;
  display:grid; grid-template-columns:2fr 1fr 1fr 1fr;
  gap:40px;
}
/* 2025-06-30 Fix: wrap brand+tagline in flex column so they align left together */
.footer-grid > div:first-child {
  display:flex; flex-direction:column; align-items:flex-start; gap:12px;
}
.footer-brand { display:flex; flex-direction:column; gap:12px; }
.footer-logo { display:flex; align-items:center; gap:8px; }
.footer-logo img { height:28px; width:auto; filter:brightness(0) invert(1); }
.footer-logo-text { font-size:1.1rem; font-weight:700; }
.footer-tagline { font-size:0.82rem; color:rgba(255,255,255,0.5); line-height:1.6; max-width:280px; }
.footer-col-title { font-size:0.72rem; text-transform:uppercase; letter-spacing:0.08em; color:rgba(255,255,255,0.35); margin-bottom:14px; }
.footer-col ul { list-style:none; display:flex; flex-direction:column; gap:8px; }
.footer-col li { color:rgba(255,255,255,0.65); font-size:0.82rem; line-height:1.6; }
.footer-col a { color:rgba(255,255,255,0.65); text-decoration:none; font-size:inherit; transition:color 0.2s; }
.footer-col a:hover { color:var(--white); }
.footer-bottom {
  max-width:var(--max-w); margin:40px auto 0; padding-top:24px;
  border-top:1px solid rgba(255,255,255,0.08);
  display:flex; justify-content:space-between; align-items:center;
  font-size:0.72rem; color:rgba(255,255,255,0.3);
}
@media (max-width:768px) {
  .footer-grid { grid-template-columns:1fr 1fr; gap:28px; }
  .footer-bottom { flex-direction:column; gap:8px; }
}

/* ---------- Page Header (shared across inner pages) ---------- */
.page-header {
  padding:120px 28px 50px; text-align:center;
  max-width:var(--max-w); margin:0 auto;
}
.page-label {
  font-size:0.72rem; text-transform:uppercase; letter-spacing:0.12em;
  color:var(--muted); margin-bottom:12px;
}
.page-title {
  font-size:2.8rem; font-weight:800; letter-spacing:-0.03em;
  line-height:1.15;
}
.page-subtitle {
  font-size:1rem; color:var(--muted); margin-top:14px;
  max-width:500px; margin-left:auto; margin-right:auto; line-height:1.6;
}
@media (max-width:768px) {
  .page-title { font-size:2rem; }
  .page-header { padding:100px 20px 36px; }
}

/* ---------- Banner / Carousel (index.html) ---------- */
/* 2025-06-30 Fix: add bottom spacing so tools cards don't stick to footer */
.tools-grid { padding-bottom: 80px; }
.banner {
  position:relative; width:100%; height:100vh; min-height:500px;
  overflow:hidden; background:var(--black);
}
.banner-track {
  display:flex; height:100%; transition:transform 0.6s cubic-bezier(0.4,0,0.2,1);
  will-change:transform;
}
.banner-slide {
  min-width:100%; height:100%; background-size:cover;
  background-position:center; background-repeat:no-repeat;
  position:relative;
}
.banner-slide::after {
  content:''; position:absolute; inset:0;
  background:linear-gradient(to top,rgba(17,17,17,0.5),transparent 50%);
  pointer-events:none;
}
.banner-arrow {
  position:absolute; top:50%; transform:translateY(-50%);
  width:48px; height:48px; border-radius:50%;
  background:rgba(255,255,255,0.08); backdrop-filter:blur(8px);
  border:1px solid rgba(255,255,255,0.12); color:#fff;
  font-size:1.2rem; display:flex; align-items:center; justify-content:center;
  cursor:pointer; z-index:5; transition:background var(--transition);
}
.banner-arrow:hover { background:rgba(255,255,255,0.18); }
.banner-arrow.prev { left:20px; }
.banner-arrow.next { right:20px; }
.banner-dots {
  position:absolute; bottom:28px; left:50%; transform:translateX(-50%);
  display:flex; gap:8px; z-index:5;
}
.banner-dot {
  width:10px; height:10px; border-radius:50%;
  background:rgba(255,255,255,0.3); border:none; cursor:pointer;
  transition:background var(--transition),transform var(--transition);
  padding:0;
}
.banner-dot.active { background:#fff; transform:scale(1.3); }
.banner-dot:hover { background:rgba(255,255,255,0.6); }
@media (max-width:768px) {
  .banner { height:56vh; min-height:320px; }
  .banner-arrow { width:36px; height:36px; font-size:1rem; }
  .banner-arrow.prev { left:10px; }
  .banner-arrow.next { right:10px; }
}