/* XPAND Static Site — Design System v2
   Aesthetic: light mode (white bg, dark text, XPAND blue accent)
   Updated: 2026-03-22 */

/* ── Futura (woff2 self-hosted, licensed) ──────────────────────────────── */
@font-face { font-family:'Futura'; src:url('../fonts/TT0140M.woff2') format('woff2'); font-weight:300; font-style:normal;  font-display:swap; }
@font-face { font-family:'Futura'; src:url('../fonts/TT0141M.woff2') format('woff2'); font-weight:300; font-style:italic;  font-display:swap; }
@font-face { font-family:'Futura'; src:url('../fonts/TT0142M.woff2') format('woff2'); font-weight:400; font-style:normal;  font-display:swap; }
@font-face { font-family:'Futura'; src:url('../fonts/TT0143M.woff2') format('woff2'); font-weight:400; font-style:italic;  font-display:swap; }
@font-face { font-family:'Futura'; src:url('../fonts/TT0144M.woff2') format('woff2'); font-weight:700; font-style:normal;  font-display:swap; }
@font-face { font-family:'Futura'; src:url('../fonts/TT0145M.woff2') format('woff2'); font-weight:700; font-style:italic;  font-display:swap; }

/* ── Source Han Sans (CJK, woff2 self-hosted, OFL-1.1) ─────────────────── */
@font-face { font-family:'Source Han Sans JP'; src:url('../fonts/SourceHanSansJP-Regular.woff2') format('woff2'); font-weight:400; font-style:normal; font-display:swap; }
@font-face { font-family:'Source Han Sans JP'; src:url('../fonts/SourceHanSansJP-Bold.woff2')    format('woff2'); font-weight:700; font-style:normal; font-display:swap; }
@font-face { font-family:'Source Han Sans CN'; src:url('../fonts/SourceHanSansCN-Regular.woff2') format('woff2'); font-weight:400; font-style:normal; font-display:swap; }
@font-face { font-family:'Source Han Sans CN'; src:url('../fonts/SourceHanSansCN-Bold.woff2')    format('woff2'); font-weight:700; font-style:normal; font-display:swap; }

/* ── Design tokens ─────────────────────────────────────────────────────── */
:root {
  /* Palette — light mode  (XPAND blue: #0067bd / #00479d) */
  --bg:           #ffffff;
  --bg-alt:       #f0f6fb;
  --surface:      #e6f0f9;
  --surface-2:    #cce0f3;
  --border:       rgba(0,103,189,0.20);
  --border-dim:   rgba(0,0,0,0.07);
  --accent:       #0067bd;
  --accent-2:     #00479d;
  --accent-glow:  rgba(0,103,189,0.12);
  --text:         #0f0f1a;
  --text-dim:     #4a4a65;
  --text-muted:   #9b9bb7;
  --radius:       12px;
  --radius-lg:    20px;
  /* Layout */
  --max-width:    1100px;
  --header-height: 72px;
  /* Legacy aliases (used by blog-post pages) */
  --color-bg:      var(--bg);
  --color-text:    var(--text);
  --color-primary: var(--accent);
  --color-muted:   var(--text-dim);
}

/* ── Language font stacks (matches ainvis DESIGN-UX.md §UX-7) ──────────── */
body { font-family: 'Futura','Century Gothic','AppleGothic','Trebuchet MS',sans-serif; }
html[lang="ja"] body {
  font-family: 'Futura','Source Han Sans JP','Yu Gothic','YuGothic',
               'Hiragino Kaku Gothic ProN','Meiryo',sans-serif;
}
html[lang="zh-CN"] body,
html[lang="zh-cn"] body {
  font-family: 'Futura','Source Han Sans CN','Microsoft YaHei',
               'PingFang SC','SimHei',sans-serif;
}

/* ── Reset ──────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; display: block; }
h1, h2, h3, h4 { font-weight: 700; letter-spacing: -0.02em; line-height: 1.2; }

/* ── Header / Nav ───────────────────────────────────────────────────────── */
.site-header {
  position: sticky; top: 0; z-index: 100;
  height: var(--header-height);
  background: rgba(255,255,255,0.80);
  backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border-dim);
}
.header-inner {
  max-width: var(--max-width); margin: 0 auto;
  padding: 0 1.5rem; height: 100%;
  display: flex; align-items: center; gap: 2rem;
}
.site-logo { display: flex; align-items: center; }
.site-logo-img { height: auto; width: 113px; display: block; }

.main-nav ul { list-style: none; display: flex; gap: 1.5rem; }
.main-nav a {
  font-size: 0.875rem; color: var(--text-dim);
  padding: 6px 10px; border-radius: 8px;
  transition: color 0.2s;
}
.main-nav a:hover { color: var(--text); text-decoration: none; }

.lang-switcher {
  list-style: none; display: flex; gap: 2px; margin-left: auto;
  background: var(--surface); border: 1px solid var(--border-dim);
  border-radius: 8px; padding: 3px;
}
.lang-switcher a {
  display: block; padding: 4px 10px; border-radius: 5px;
  font-size: 11px; font-weight: 700; letter-spacing: 0.06em;
  color: var(--text-dim); transition: all 0.2s;
}
.lang-switcher a:hover { color: var(--text); text-decoration: none; }
.lang-switcher .active a,
.lang-switcher a[aria-current] {
  background: var(--accent); color: #fff;
}

/* ── Main ───────────────────────────────────────────────────────────────── */
#main-content { min-height: calc(100vh - var(--header-height) - 80px); }

/* Non-LP pages: about / static pages use .page-content for max-width + padding */
.page-content {
  max-width: 760px; margin: 3rem auto; padding: 0 1.5rem;
}

/* ── Hero badge (pulse pill) ────────────────────────────────────────────── */
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 16px; margin-bottom: 28px;
  background: rgba(0,103,189,0.08);
  border: 1px solid rgba(0,103,189,0.25);
  border-radius: 99px;
  font-size: 12px; font-weight: 600; color: var(--accent);
  letter-spacing: 0.05em; text-transform: uppercase;
}
.hero-badge .pulse {
  width: 6px; height: 6px;
  background: var(--accent); border-radius: 50%;
  flex-shrink: 0;
  animation: pulse 2s ease infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.45; transform: scale(0.8); }
}

/* ── Section label ──────────────────────────────────────────────────────── */
.section-label {
  display: block;
  font-size: 11px; font-weight: 700; letter-spacing: 0.10em;
  text-transform: uppercase; color: var(--accent);
  margin-bottom: 12px;
}

/* ── LP – Hero ──────────────────────────────────────────────────────────── */
.lp-hero {
  max-width: 780px; margin: 5rem auto 4rem;
  padding: 0 1.5rem; text-align: center;
  position: relative;
}
.lp-hero::after {
  content: ""; position: absolute; top: 50%; left: 50%;
  transform: translate(-50%,-50%);
  width: 600px; height: 350px;
  background: radial-gradient(ellipse, var(--accent-glow) 0%, transparent 70%);
  pointer-events: none; z-index: -1;
}
.lp-hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  line-height: 1.15; letter-spacing: -0.03em;
  background: linear-gradient(90deg, var(--accent) 0%, #000000 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1.25rem; font-weight: 800;
}
.lp-hero p {
  font-size: 1.1rem; color: var(--text-dim);
  line-height: 1.8; max-width: 560px; margin: 0 auto;
}

/* ── LP – Services ──────────────────────────────────────────────────────── */
.lp-services {
  max-width: var(--max-width);
  margin: 0 auto 4rem; padding: 0 1.5rem;
  text-align: center;
}
.lp-services > .section-label { margin-bottom: 40px; }
.lp-services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
  text-align: left;
}
.lp-service-card {
  background: var(--bg);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius-lg);
  padding: 2rem;
  display: flex; flex-direction: column; gap: 1rem;
  position: relative; overflow: hidden;
  transition: border-color 0.25s, transform 0.25s, box-shadow 0.25s;
}
.lp-service-card::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  opacity: 0; transition: opacity 0.25s;
}
.lp-service-card:hover {
  border-color: var(--border);
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(99,102,241,0.08);
}
.lp-service-card:hover::before { opacity: 1; }
.lp-service-card h2 {
  font-size: 1.15rem; font-weight: 700; letter-spacing: -0.01em;
}
.lp-service-card p {
  font-size: 0.9rem; color: var(--text-dim);
  line-height: 1.75; flex: 1;
}
.lp-service-card a {
  align-self: flex-start;
  display: inline-flex; align-items: center; gap: 4px;
  padding: 0.45rem 1.1rem;
  background: var(--accent); color: #fff;
  border-radius: var(--radius); font-size: 0.8rem; font-weight: 600;
  transition: background 0.2s, transform 0.2s;
}
.lp-service-card a:hover {
  background: var(--accent-2);
  transform: translateY(-1px);
  text-decoration: none;
}

/* ── LP – Tagline strip ─────────────────────────────────────────────────── */
.lp-tagline {
  max-width: 780px; margin: 0 auto 4rem;
  padding: 2.5rem 1.5rem; text-align: center;
  border-top: 1px solid var(--border-dim);
  border-bottom: 1px solid var(--border-dim);
}
.lp-tagline p {
  font-size: 1.3rem; font-weight: 700; letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}
.lp-tagline small { font-size: 0.9rem; color: var(--text-dim); }

/* ── LP – Blog CTA ──────────────────────────────────────────────────────── */
.lp-blog-cta { text-align: center; margin: 0 auto 5rem; }
.lp-blog-cta a {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 0.75rem 2rem;
  border: 1.5px solid var(--accent);
  color: var(--accent);
  border-radius: var(--radius);
  font-size: 0.95rem; font-weight: 600;
  transition: all 0.2s;
}
.lp-blog-cta a:hover {
  background: var(--accent); color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 8px 24px var(--accent-glow);
  text-decoration: none;
}

/* ── Blog Index ─────────────────────────────────────────────────────────── */
.blog-index { max-width: var(--max-width); margin: 3rem auto; padding: 0 1.5rem; }
.blog-index > h1 { font-size: 2rem; margin-bottom: 2rem; letter-spacing: -0.03em; }
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}
.blog-card {
  border: 1px solid var(--border-dim);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s;
}
.blog-card:hover {
  border-color: var(--border);
  box-shadow: 0 8px 24px rgba(0,103,189,0.07);
  transform: translateY(-2px);
}
.card-link { display: flex; flex-direction: column; height: 100%; color: inherit; }
.card-link:hover { text-decoration: none; }
.card-link img { width: 100%; height: 200px; object-fit: cover; background: var(--bg-alt); }
/* Default logo thumbnail: contain instead of cover, with padding */
.card-link img[src$="XPAND-Logo.svg"] {
  object-fit: contain; padding: 2rem; background: var(--surface);
}
.card-body { padding: 1.25rem; flex: 1; display: flex; flex-direction: column; gap: 0.5rem; }
.card-body h2 { font-size: 1rem; font-weight: 700; line-height: 1.4; }
.card-body time { font-size: 0.75rem; color: var(--text-muted); }
.card-body p { font-size: 0.875rem; color: var(--text-dim); margin-top: auto; line-height: 1.6; }
.card-meta { display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap; }
.source-badge {
  font-size: 0.7rem; padding: 0.1rem 0.4rem;
  border-radius: 3px; font-weight: 600;
}
.source-badge.archive { background: var(--surface-2); color: var(--text-dim); }

/* ── Pagination ─────────────────────────────────────────────────────────── */
.pagination { margin: 3rem 0 1rem; display: flex; justify-content: center; }
.pagination ul { list-style: none; display: flex; gap: 0.4rem; flex-wrap: wrap; }
.pagination a {
  display: inline-block; padding: 0.4rem 0.8rem;
  border: 1px solid var(--border-dim);
  border-radius: var(--radius); font-size: 0.875rem;
  transition: all 0.2s;
}
.pagination [aria-current="page"] {
  background: var(--accent); color: #fff; border-color: var(--accent);
}
.pagination a:hover:not([aria-current]) {
  border-color: var(--border);
  background: var(--surface);
  text-decoration: none;
}

/* ── Blog Post ──────────────────────────────────────────────────────────── */
.blog-post { max-width: 760px; margin: 3rem auto; padding: 0 1.5rem; }
.post-header { margin-bottom: 2rem; }
.back-link {
  display: inline-flex; align-items: center; gap: 4px;
  margin-bottom: 1rem; font-size: 0.875rem; color: var(--text-muted);
  transition: color 0.2s;
}
.back-link:hover { color: var(--accent); text-decoration: none; }
.post-header h1 {
  font-size: 2rem; margin-bottom: 0.5rem; letter-spacing: -0.03em;
  background: linear-gradient(90deg, var(--accent) 0%, #000000 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.post-meta { display: flex; align-items: center; gap: 0.75rem; flex-wrap: wrap; margin-top: 0.5rem; }
.post-meta time { font-size: 0.875rem; color: var(--text-muted); }
.post-categories { list-style: none; display: flex; flex-wrap: wrap; gap: 0.4rem; }
.post-categories li {
  font-size: 0.75rem; padding: 0.15rem 0.5rem;
  background: var(--surface-2); border-radius: 4px; color: var(--text-dim);
}
.post-body { line-height: 1.9; }
.post-body p { margin-bottom: 1.25rem; }
.post-body h2, .post-body h3 { margin: 2rem 0 1rem; }
.post-body figure { margin: 1.5rem 0; }
.post-body img { border-radius: var(--radius); max-width: 100%; height: auto; }
.archive-note {
  margin-top: 2rem; padding: 1rem;
  background: var(--surface); border-left: 3px solid var(--accent);
  font-size: 0.85rem; color: var(--text-dim);
  border-radius: 0 var(--radius) var(--radius) 0;
}

/* ── Hero video ─────────────────────────────────────────────────────────── */
.lp-hero { position: relative; overflow: hidden; }
.hero-video {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: cover; z-index: 0; opacity: 0.70; pointer-events: none;
  filter: brightness(1.08);
  -webkit-mask-image: linear-gradient(to right, transparent 0%, black 20%, black 80%, transparent 100%),
                      linear-gradient(to bottom, transparent 0%, black 20%, black 80%, transparent 100%);
  -webkit-mask-composite: destination-in;
  mask-image: linear-gradient(to right, transparent 0%, black 20%, black 80%, transparent 100%),
              linear-gradient(to bottom, transparent 0%, black 20%, black 80%, transparent 100%);
  mask-composite: intersect;
}
.hero-content { position: relative; z-index: 1; }

/* ── LP About section ────────────────────────────────────────────────────── */
.lp-about {
  max-width: var(--max-width); margin: 0 auto; padding: 3rem 1.5rem;
}
.lp-about-inner {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 2rem;
}
.lp-about-inner p { color: var(--text-dim); line-height: 1.8; margin-bottom: 1rem; }
.lp-about-link {
  display: inline-block; color: var(--accent); font-weight: 600;
  text-decoration: none; font-size: 0.95rem;
}
.lp-about-link:hover { color: var(--accent-2); }

/* ── Footer ─────────────────────────────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--border-dim);
  padding: 1.5rem; text-align: center;
  font-size: 0.875rem; color: var(--text-muted);
}

/* ── Hero: full-width + scaled video on desktop ─────────────────────────── */
@media (min-width: 641px) {
  .lp-hero {
    max-width: none;
    margin: 0;
    min-height: 70vh;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  .hero-content {
    max-width: 960px;
    width: 100%;
    padding: 5rem 2.5rem 4rem;
    text-align: center;
  }
  .lp-hero h1 { font-size: clamp(3rem, 4.5vw, 4rem); }
  .lp-hero p  { font-size: clamp(1.1rem, 1.8vw, 1.4rem); max-width: 720px; }
  .hero-video { transform: scale(2); }
}

/* ── Responsive ─────────────────────────────────────────────────────────── */
@media (max-width: 640px) {
  .lp-hero h1 { font-size: 1.75rem; }
  .main-nav { display: none; }
  .lp-services-grid { grid-template-columns: 1fr; }
}