:root {
  --navy: #16263f;
  --navy-deep: #0f1b2e;
  --green: #2f7d3b;
  --green-hover: #276a32;
  --gold: #d9a521;
  --gold-hover: #c4941a;

  --bg: #ffffff;
  --bg-alt: #f5f7f6;
  --text: #16263f;
  --text-muted: #5c6b7a;
  --border: #e3e7ea;
  --max-width: 1120px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1b2e;
    --bg-alt: #16263f;
    --text: #eef2f5;
    --text-muted: #9fb0c0;
    --border: #26374d;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans Thai", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}
img { max-width: 100%; display: block; }
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
h1, h2 { line-height: 1.25; margin: 0 0 16px; }
h2 { font-size: 2rem; }
p { margin: 0 0 16px; color: var(--text-muted); }

.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 600;
  transition: transform .15s ease, background .15s ease, color .15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--green); color: #fff; }
.btn-primary:hover { background: var(--green-hover); }
.btn-gold { background: var(--gold); color: var(--navy-deep); }
.btn-gold:hover { background: var(--gold-hover); }
.btn-outline { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn-outline:hover { border-color: var(--green); color: var(--green); }
.btn-ghost { background: transparent; color: var(--text); text-decoration: underline; padding: 12px 8px; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 90%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; padding: 12px 24px; gap: 16px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.2rem; text-decoration: none; color: var(--text); }
.logo img { width: 40px; height: 40px; border-radius: 8px; }
.logo span { color: var(--green); }
.nav { display: flex; gap: 24px; }
.nav a { color: var(--text); text-decoration: none; font-size: .95rem; }
.nav a:hover { color: var(--green); }
.nav-cta { font-size: .85rem; padding: 9px 18px; white-space: nowrap; }

@media (max-width: 820px) {
  .nav { display: none; }
  .nav-cta { display: none; }
}

/* Hero */
.hero {
  padding: 88px 0 72px;
  background:
    radial-gradient(1200px 500px at 80% -10%, rgba(47,125,59,.18), transparent),
    var(--navy);
  color: #eef2f5;
}
.hero-inner { max-width: 780px; }
.hero .eyebrow { color: var(--gold); }
.hero h1 { color: #ffffff; }
.hero-sub { color: #c7d3de; }
.eyebrow { text-transform: uppercase; letter-spacing: .08em; font-size: .8rem; font-weight: 700; margin-bottom: 12px; }
.hero h1 { font-size: clamp(1.9rem, 4vw, 2.9rem); }
.hero-sub { font-size: 1.12rem; margin-bottom: 32px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero .btn-ghost { color: #eef2f5; }

/* Stats */
.stats { padding: 44px 0; border-bottom: 1px solid var(--border); background: var(--bg-alt); }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.stat-num { display: block; font-size: 2rem; font-weight: 700; color: var(--green); }
.stat-label { font-size: .85rem; color: var(--text-muted); }
@media (max-width: 640px) { .stats-grid { grid-template-columns: repeat(2, 1fr); } }

/* Portfolio */
.portfolio { padding: 80px 0; }
.section-sub { margin-top: -8px; }
.category-tabs { display: flex; gap: 8px; margin-bottom: 32px; flex-wrap: wrap; }
.tab {
  padding: 8px 18px; border-radius: 999px; border: 1px solid var(--border);
  background: transparent; color: var(--text-muted); cursor: pointer; font-size: .9rem;
}
.tab.active, .tab:hover { border-color: var(--green); color: var(--green); background: color-mix(in srgb, var(--green) 8%, transparent); }

.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
@media (max-width: 720px) { .grid { grid-template-columns: repeat(2, 1fr); } }

.grid-item {
  position: relative; display: block; border-radius: 12px; overflow: hidden;
  aspect-ratio: 3/4; background: var(--bg-alt);
}
.grid-item img { width: 100%; height: 100%; object-fit: cover; transition: transform .3s ease; }
.grid-item:hover img { transform: scale(1.05); }
.grid-item-overlay {
  position: absolute; inset: auto 0 0 0; padding: 12px;
  background: linear-gradient(to top, rgba(15,27,46,.85), transparent);
  color: #fff; font-size: .85rem; font-weight: 600;
  opacity: 0; transition: opacity .2s ease;
}
.grid-item:hover .grid-item-overlay { opacity: 1; }

/* About */
.about { padding: 80px 0; background: var(--bg-alt); }
.about-inner { display: grid; grid-template-columns: 280px 1fr; gap: 48px; align-items: center; }
.about-photo img { border-radius: 16px; }
@media (max-width: 720px) { .about-inner { grid-template-columns: 1fr; } .about-photo { max-width: 240px; margin: 0 auto; } }

/* Subscribe */
.subscribe { padding: 80px 0; text-align: center; }
.subscribe-inner { max-width: 480px; margin: 0 auto; }
.subscribe-form { display: flex; gap: 8px; margin-top: 8px; }
.subscribe-form input {
  flex: 1; padding: 12px 16px; border-radius: 999px; border: 1px solid var(--border);
  background: var(--bg); color: var(--text); font-size: .95rem;
}
.subscribe-form input:focus { outline: 2px solid var(--green); outline-offset: 2px; }
@media (max-width: 480px) { .subscribe-form { flex-direction: column; } }

/* Footer */
.site-footer { padding: 32px 0; background: var(--navy); color: #c7d3de; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px; }
.footer-inner p { margin: 0; font-size: .85rem; color: #c7d3de; }
.social-links { display: flex; gap: 20px; }
.social-links a { color: #c7d3de; text-decoration: none; font-size: .9rem; }
.social-links a:hover { color: var(--gold); }