*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;background:#f8f9fa;color:#1a1a2e}
.login-screen{min-height:100vh;display:flex;align-items:center;justify-content:center;background:#161c2f;padding:16px}
.login-form{width:100%;max-width:360px;text-align:center}
.login-logo{width:400px;max-width:100%;margin-bottom:24px}
.login-hint{color:#9ca3af;font-size:14px;margin-bottom:24px}
.login-input{width:100%;padding:10px 0;background:transparent;border:none;border-bottom:1px solid rgba(255,255,255,.2);color:#fff;font-size:14px;outline:none}
.login-input::placeholder{color:rgba(255,255,255,.4)}
.login-btn{width:100%;padding:10px;background:#ffff33;color:#161c2f;border:none;border-radius:6px;font-size:14px;font-weight:500;cursor:pointer;margin-top:12px}
.login-btn:hover{background:#fff}
.login-error{color:#f87171;font-size:13px;margin-top:8px}

.app{display:none}
header{border-bottom:1px solid #e5e7eb;background:#fff;padding:16px 0}
.container{max-width:1100px;margin:0 auto;padding:0 16px}
.header-inner{display:flex;align-items:center;justify-content:space-between}
.header-left{display:flex;align-items:center;gap:12px}
.header-icon{width:32px;height:32px;border-radius:6px;background:#1a1a2e;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:13px}
.header-title{font-size:18px;font-weight:600}
.btn{display:inline-flex;align-items:center;gap:6px;padding:6px 14px;border:1px solid #e5e7eb;border-radius:6px;background:#fff;font-size:13px;cursor:pointer;font-family:inherit}
.btn:hover{background:#f3f4f6}
.btn-primary{background:#1a1a2e;color:#fff;border-color:#1a1a2e}
.btn-primary:hover{background:#2d2d4e}
.btn-success{background:#16a34a;color:#fff;border-color:#16a34a}

main{padding:32px 0}
.grid{display:grid;grid-template-columns:2fr 1fr;gap:32px}
@media(max-width:900px){.grid{grid-template-columns:1fr}}
.section-title{font-size:12px;font-weight:500;color:#6b7280;text-transform:uppercase;letter-spacing:.05em;margin-bottom:16px}

.tabs{display:flex;gap:4px;background:#f3f4f6;border-radius:6px;padding:4px;margin-bottom:16px;width:fit-content}
.tab{padding:6px 16px;border-radius:4px;border:none;background:transparent;font-size:13px;font-weight:500;cursor:pointer;color:#6b7280;font-family:inherit}
.tab.active{background:#fff;color:#1a1a2e;box-shadow:0 1px 2px rgba(0,0,0,.08)}

.sig-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media(max-width:700px){.sig-grid{grid-template-columns:1fr}}

.card{background:#fff;border:1px solid #e5e7eb;border-radius:8px;overflow:hidden}
.card-header{padding:16px;border-bottom:1px solid #e5e7eb}
.card-header h3{font-size:15px;font-weight:600}
.card-header p{font-size:13px;color:#6b7280}
.card-preview{padding:16px;overflow:hidden}
.sig-frame{position:relative;width:100%}
.sig-scale{position:absolute;top:0;left:50%;width:380px;margin-left:-190px;transform-origin:top center}
.card-actions{padding:16px;border-top:1px solid #e5e7eb;display:flex;gap:8px}
.card-actions .btn{flex:1;justify-content:center;font-size:13px}

.guide-card{background:#fff;border:1px solid #e5e7eb;border-radius:8px;overflow:hidden;position:sticky;top:24px}
.guide-title{padding:16px 20px;font-size:17px;font-weight:600}
.guide-tabs{display:flex;border-bottom:1px solid #e5e7eb;background:#f9fafb}
.guide-tab{flex:1;padding:10px 8px;border:none;background:transparent;font-size:12px;cursor:pointer;color:#6b7280;font-family:inherit;text-align:center}
.guide-tab.active{background:#f0f0f0;color:#1a1a2e;font-weight:500}
.guide-content{padding:20px;display:none}
.guide-content.active{display:block}
.guide-content ol{list-style:decimal inside;font-size:13px;line-height:1.6}
.guide-content ol li{margin-bottom:10px}
.guide-content kbd{background:#f3f4f6;padding:2px 6px;border-radius:3px;font-family:monospace;font-size:11px}
.guide-content code{background:#f3f4f6;padding:2px 6px;border-radius:3px;font-family:monospace;font-size:11px}
.guide-content code.block{display:block;margin-top:4px;padding:8px;word-break:break-all}

.toast{position:fixed;bottom:24px;right:24px;background:#1a1a2e;color:#fff;padding:12px 20px;border-radius:8px;font-size:13px;opacity:0;transition:opacity .3s;pointer-events:none;z-index:100}
.toast.show{opacity:1}