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

:root {
  --bg: #eef6ff;
  --surface: #ffffff;
  --text: #0b1b2b;
  --muted: #5b6b7a;
  --primary: #2f7bf6;
  --primary-600: #1e61d4;
  --border: #d8e4f2;
  --shadow: 0 10px 30px rgba(15, 50, 86, 0.12);
  --gradient: linear-gradient(120deg, #d6ebff, #f5fbff);
}

body {
  font-family: "Segoe UI", "Prompt", "Noto Sans Thai", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
}

header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.container {
  width: min(1100px, 92%);
  margin: 0 auto;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 20px;
}

.brand-badge {
  width: 42px;
  height: 42px;
  border-radius: 14px;
  background: var(--gradient);
  display: grid;
  place-items: center;
  color: var(--primary-600);
  font-weight: 700;
}

.nav-links {
  display: flex;
  gap: 16px;
  align-items: center;
}

.nav-links a {
  padding: 10px 14px;
  border-radius: 10px;
  font-weight: 600;
  color: var(--muted);
}

.nav-links a.active,
.nav-links a:hover {
  background: rgba(47, 123, 246, 0.12);
  color: var(--primary-600);
}

.hero {
  background: var(--gradient);
  padding: 48px 0 36px;
}

.hero-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
  align-items: center;
}

.hero h1 {
  font-size: clamp(28px, 4vw, 40px);
  margin-bottom: 12px;
}

.hero p {
  color: var(--muted);
  font-size: 16px;
  line-height: 1.6;
}

.pill {
  display: inline-flex;
  gap: 8px;
  align-items: center;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  font-weight: 600;
  font-size: 13px;
  color: var(--primary-600);
  margin-bottom: 12px;
}

main {
  padding: 32px 0 48px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 22px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 22px;
  box-shadow: var(--shadow);
}

.card h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.card p {
  color: var(--muted);
  line-height: 1.5;
}

.input-group {
  display: grid;
  gap: 12px;
  margin-top: 16px;
}

input[type="file"],
input[type="url"],
input[type="text"] {
  width: 100%;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  font-size: 15px;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 12px;
}

.button {
  border: none;
  padding: 12px 18px;
  border-radius: 12px;
  background: var(--primary);
  color: white;
  font-weight: 600;
  cursor: pointer;
}

.button.secondary {
  background: transparent;
  color: var(--primary-600);
  border: 1px solid var(--border);
}

.preview {
  margin-top: 16px;
  border-radius: 14px;
  border: 1px dashed var(--border);
  padding: 14px;
  display: grid;
  gap: 10px;
  color: var(--muted);
  min-height: 120px;
  place-items: center;
}

.preview img {
  width: 100%;
  max-height: 280px;
  object-fit: contain;
  border-radius: 12px;
  background: rgba(15, 27, 43, 0.06);
}

.link-output {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  font-size: 14px;
  color: var(--muted);
}

.link-output a {
  color: var(--primary-600);
  font-weight: 600;
}

.status {
  font-size: 14px;
  color: var(--muted);
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(47, 123, 246, 0.08);
}

.contact-card {
  display: grid;
  gap: 16px;
}

.contact-item {
  padding: 16px;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: rgba(47, 123, 246, 0.08);
  display: grid;
  gap: 6px;
}

.footer {
  padding: 24px 0 40px;
  color: var(--muted);
  text-align: center;
}

.credits {
  display: inline-flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
  font-weight: 600;
}

@media (max-width: 720px) {
  .nav-links {
    display: none;
  }
  .nav {
    gap: 12px;
    flex-wrap: wrap;
  }
}