/* Cosoado Lab — Portfolio index
   Plain CSS, no framework. Mobile-first, dark hero / light body. */

:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f7f8fa;
  --color-ink: #0d1117;
  --color-ink-2: #4a5568;
  --color-ink-3: #8b95a3;
  --color-line: #e2e8f0;
  --color-primary: #0b3d91;
  --color-primary-dark: #072a66;
  --color-accent: #e63946;
  --color-dark: #0d1117;
  --color-dark-2: #1a2332;

  --max-width: 1180px;
  --gap: clamp(1rem, 4vw, 2rem);
  --radius: 8px;
  --radius-lg: 16px;

  --shadow-sm: 0 1px 2px rgba(13, 17, 23, .05);
  --shadow-md: 0 8px 24px rgba(13, 17, 23, .08);
  --shadow-lg: 0 24px 48px rgba(11, 61, 145, .14);

  --font-jp: "Noto Sans JP", -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", Meiryo, sans-serif;
  --font-en: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-jp);
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-ink);
  background: var(--color-bg);
  letter-spacing: 0.02em;
  -webkit-font-smoothing: antialiased;
}

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

.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--gap);
}

.eyebrow {
  font-family: var(--font-en);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.32em;
  color: var(--color-primary);
  margin: 0 0 0.6rem;
  text-transform: uppercase;
}

/* ----- Header ----- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, .85);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--color-line);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.brand {
  display: flex; align-items: center; gap: 0.6rem;
  text-decoration: none;
  font-weight: 700;
}
.brand-mark {
  display: inline-grid; place-items: center;
  width: 32px; height: 32px;
  border-radius: 6px;
  background: var(--color-ink);
  color: #fff;
  font-family: var(--font-en);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}
.brand-name {
  font-family: var(--font-en);
  font-size: 1rem;
  letter-spacing: 0.03em;
}
.site-nav {
  display: flex;
  gap: clamp(1rem, 3vw, 2rem);
  font-size: 0.92rem;
  font-weight: 500;
}
.site-nav a {
  text-decoration: none;
  color: var(--color-ink-2);
  transition: color 0.18s ease;
}
.site-nav a:hover { color: var(--color-primary); }
@media (max-width: 520px) {
  .site-nav a:not([href="#contact"]) { display: none; }
}

/* ----- Hero ----- */
.hero {
  background:
    radial-gradient(ellipse at top right, rgba(11, 61, 145, .08), transparent 50%),
    radial-gradient(ellipse at bottom left, rgba(230, 57, 70, .05), transparent 50%),
    var(--color-bg);
  padding: clamp(4rem, 10vw, 7rem) 0 clamp(3rem, 8vw, 5rem);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute; inset: 0;
  background-image: radial-gradient(circle at 1px 1px, rgba(13, 17, 23, .04) 1px, transparent 0);
  background-size: 28px 28px;
  pointer-events: none;
}
.hero .container { position: relative; }
.hero-title {
  font-size: clamp(2.2rem, 5vw + 1rem, 4rem);
  font-weight: 700;
  line-height: 1.35;
  margin: 0 0 1.4rem;
  letter-spacing: 0.005em;
}
.hero-lead {
  font-size: clamp(0.95rem, 1vw + 0.7rem, 1.1rem);
  color: var(--color-ink-2);
  line-height: 2;
  margin: 0 0 2.4rem;
  max-width: 640px;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.8rem; }

/* ----- Buttons ----- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 0.95rem 1.8rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.03em;
  text-decoration: none;
  border: 1px solid transparent;
  transition: transform 0.15s ease, background 0.18s ease, border-color 0.18s ease;
  white-space: nowrap;
}
.btn-primary {
  background: var(--color-ink);
  color: #fff;
}
.btn-primary:hover {
  background: var(--color-primary);
  transform: translateY(-1px);
}
.btn-ghost {
  background: transparent;
  color: var(--color-ink);
  border-color: var(--color-line);
}
.btn-ghost:hover {
  background: var(--color-bg-alt);
  border-color: var(--color-ink-3);
}
.btn-link {
  display: inline-flex; align-items: center;
  font-weight: 600; font-size: 0.95rem;
  color: var(--color-primary);
  text-decoration: none;
  transition: gap 0.18s ease;
  gap: 0.25rem;
}
.btn-link:hover { gap: 0.5rem; }

/* ----- Section heads ----- */
.section-head { margin-bottom: clamp(2.5rem, 5vw, 4rem); max-width: 720px; }
.section-head h2 {
  font-size: clamp(1.6rem, 3vw + 0.5rem, 2.2rem);
  font-weight: 700;
  line-height: 1.4;
  margin: 0 0 0.8rem;
}
.section-lead {
  font-size: 0.95rem;
  color: var(--color-ink-2);
  margin: 0;
  line-height: 1.9;
}

/* ----- Templates section ----- */
.templates {
  padding: clamp(4rem, 9vw, 6rem) 0;
  background: var(--color-bg);
  border-top: 1px solid var(--color-line);
}
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 320px), 1fr));
  gap: clamp(1.2rem, 2.5vw, 2rem);
}

.card {
  background: var(--color-bg);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}
.card:hover {
  transform: translateY(-4px);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-lg);
}
.card-thumb {
  display: block;
  aspect-ratio: 16 / 10;
  position: relative;
  overflow: hidden;
  background: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-line);
  text-decoration: none;
}
.card-thumb img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.45s ease;
}
.card-thumb:hover img { transform: scale(1.03); }
.card-thumb-overlay {
  position: absolute;
  inset: auto 0 0 0;
  padding: 0.6rem 1rem;
  background: linear-gradient(to top, rgba(13, 17, 23, .85), transparent);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  opacity: 0;
  transition: opacity 0.25s ease;
}
.card-thumb:hover .card-thumb-overlay { opacity: 1; }

.card-thumb-placeholder {
  display: grid; place-items: center;
  background:
    repeating-linear-gradient(45deg, var(--color-bg-alt), var(--color-bg-alt) 20px, #ecedf0 20px, #ecedf0 40px);
}
.placeholder-label {
  font-family: var(--font-en);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--color-ink-3);
  background: var(--color-bg);
  padding: 0.4rem 0.9rem;
  border-radius: 99px;
  border: 1px solid var(--color-line);
}

.card-body {
  padding: clamp(1.2rem, 2vw, 1.5rem);
  display: flex; flex-direction: column;
  flex: 1;
}
.card-tags {
  display: flex; flex-wrap: wrap; gap: 0.4rem;
  margin-bottom: 0.7rem;
}
.tag {
  display: inline-block;
  padding: 0.22rem 0.7rem;
  border-radius: 99px;
  background: rgba(11, 61, 145, .08);
  color: var(--color-primary-dark);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.05em;
}
.tag-tech { background: rgba(13, 17, 23, .06); color: var(--color-ink); }
.tag-muted { background: var(--color-bg-alt); color: var(--color-ink-3); }

.card-title {
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1.5;
  margin: 0 0 0.5rem;
}
.card-desc {
  font-size: 0.92rem;
  line-height: 1.85;
  color: var(--color-ink-2);
  margin: 0 0 1rem;
  flex: 1;
}
.card-meta {
  list-style: none;
  padding: 0;
  margin: 0 0 1rem;
  display: flex; flex-wrap: wrap; gap: 0.4rem 1rem;
  font-size: 0.78rem;
  color: var(--color-ink-3);
  border-top: 1px dashed var(--color-line);
  padding-top: 0.9rem;
}
.card-meta strong { color: var(--color-ink); font-weight: 600; }
.card-actions {
  display: flex; align-items: center; justify-content: flex-end;
  margin-top: auto;
}
.card-coming { opacity: 0.85; }
.card-coming:hover { transform: none; box-shadow: none; border-color: var(--color-line); }

/* ----- About ----- */
.about {
  padding: clamp(4rem, 9vw, 6rem) 0;
  background: var(--color-bg-alt);
}
.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 4vw, 3rem);
}
@media (min-width: 768px) {
  .about-grid { grid-template-columns: 1fr 1.6fr; }
}
.about-text p {
  margin: 0 0 1.2rem;
  line-height: 2;
  color: var(--color-ink-2);
}
.about-text p:last-child { margin-bottom: 0; }

/* ----- CTA ----- */
.cta {
  padding: clamp(4rem, 9vw, 6rem) 0;
  background: var(--color-dark);
  color: #fff;
  text-align: center;
}
.cta h2 {
  font-size: clamp(1.6rem, 3vw + 0.5rem, 2.2rem);
  font-weight: 700;
  margin: 0 0 1rem;
}
.cta p {
  color: #cbd5e1;
  font-size: 0.95rem;
  margin: 0 auto 2rem;
  max-width: 540px;
  line-height: 2;
}
.cta-actions { display: flex; gap: 0.8rem; justify-content: center; flex-wrap: wrap; }
.cta .btn-primary { background: var(--color-accent); color: #fff; }
.cta .btn-primary:hover { background: #d62839; }
.cta .btn-ghost {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, .25);
}
.cta .btn-ghost:hover { background: rgba(255, 255, 255, .08); border-color: rgba(255, 255, 255, .5); }

/* ----- Footer ----- */
.site-footer {
  padding: 1.6rem 0;
  background: #fff;
  border-top: 1px solid var(--color-line);
  font-size: 0.82rem;
  color: var(--color-ink-3);
}
.footer-inner {
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.6rem;
}
.footer-brand, .footer-meta { margin: 0; font-family: var(--font-en); }
.footer-meta { font-size: 0.78rem; }