* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; line-height: 1.6; color: #333; background: #f8f9fa; }
.container { max-width: 960px; margin: 0 auto; padding: 0 20px; }
a { color: #2563eb; text-decoration: none; }
a:hover { text-decoration: underline; }

header { background: linear-gradient(135deg, #1e3a5f, #2563eb); color: #fff; padding: 40px 0; text-align: center; }
header h1 { font-size: 2.5em; margin-bottom: 5px; }
header .subtitle { font-size: 1.1em; opacity: .85; }

.hero { text-align: center; padding: 50px 0 30px; }
.hero h2 { font-size: 1.8em; color: #1e3a5f; margin-bottom: 15px; }
.hero p { color: #666; max-width: 650px; margin: 0 auto 30px; font-size: 1.05em; }

.btn-download { display: inline-flex; align-items: center; gap: 12px; background: #2563eb; color: #fff; padding: 14px 32px; border-radius: 10px; text-decoration: none; font-size: 1em; transition: background .2s, transform .1s; }
.btn-download:hover { background: #1d4ed8; text-decoration: none; transform: translateY(-1px); }
.btn-icon { font-size: 1.6em; }
.btn-title { display: block; font-weight: 700; font-size: 1.1em; }
.btn-desc { display: block; font-size: .8em; opacity: .85; }
.version-info { font-size: .85em; color: #999; margin-top: 10px; }

.features { padding: 40px 0; }
.features h2 { text-align: center; color: #1e3a5f; margin-bottom: 30px; font-size: 1.6em; }
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(270px, 1fr)); gap: 20px; }
.feature-card { background: #fff; border-radius: 10px; padding: 24px; box-shadow: 0 1px 3px rgba(0,0,0,.08); border: 1px solid #e5e7eb; }
.feature-icon { font-size: 2em; margin-bottom: 10px; }
.feature-card h3 { font-size: 1.1em; color: #1e3a5f; margin-bottom: 8px; }
.feature-card p { font-size: .9em; color: #666; }

.usage { padding: 40px 0; }
.usage h2 { text-align: center; color: #1e3a5f; margin-bottom: 30px; font-size: 1.6em; }
.step { display: flex; gap: 18px; margin-bottom: 28px; align-items: flex-start; }
.step-num { background: #2563eb; color: #fff; width: 32px; height: 32px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: .9em; flex-shrink: 0; }
.step h3 { color: #1e3a5f; margin-bottom: 6px; font-size: 1.05em; }
.step p { color: #666; font-size: .9em; margin-bottom: 8px; }
pre { background: #1e293b; color: #e2e8f0; padding: 14px 18px; border-radius: 8px; overflow-x: auto; font-size: .85em; line-height: 1.5; margin: 8px 0; }
code { font-family: "SF Mono", "Fira Code", monospace; }
.step p code { background: #e5e7eb; padding: 1px 5px; border-radius: 4px; font-size: .9em; color: #333; }

.api-ref { padding: 40px 0; }
.api-ref h2 { text-align: center; color: #1e3a5f; margin-bottom: 20px; font-size: 1.6em; }
table { width: 100%; border-collapse: collapse; background: #fff; border-radius: 10px; overflow: hidden; box-shadow: 0 1px 3px rgba(0,0,0,.08); }
th, td { padding: 12px 16px; text-align: left; border-bottom: 1px solid #e5e7eb; font-size: .9em; }
th { background: #f1f5f9; color: #475569; font-weight: 600; }
td code { background: #e5e7eb; padding: 2px 6px; border-radius: 4px; font-size: .85em; }

footer { text-align: center; padding: 30px 0; color: #999; font-size: .85em; border-top: 1px solid #e5e7eb; margin-top: 20px; }