@import url('https://api.fontshare.com/v2/css?f[]=satoshi@300,400,500,700&f[]=cabinet-grotesk@800&display=swap');

:root {
  --ink-primary:   #0f172a;
  --ink-secondary: #6b7280;
  --ink-tertiary:  #9ca3af;
  --surface:       #f5f6f8;
  --surface-2:     #eceff3;
  --surface-3:     #e1e5eb;
  --border:        #d9dee7;
  --border-strong: #b2bac7;
  --radius-sm:     8px;
  --radius-md:     12px;
  --radius-lg:     16px;
  --ease-out:      cubic-bezier(0.23, 1, 0.32, 1);
  --nav-h:         64px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; -webkit-font-smoothing: antialiased; scroll-behavior: smooth; overflow-x: clip; }
body { font-family: 'Satoshi', system-ui, sans-serif; background: var(--surface); color: var(--ink-primary); line-height: 1.6; }
a { color: inherit; text-decoration: none; }
.container { max-width: 1120px; margin: 0 auto; padding: 0 24px; width: 100%; }

.nav { position: sticky; top: 0; z-index: 100; height: var(--nav-h); background: rgba(245,246,248,0.88); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px); border-bottom: 1px solid var(--border); display: flex; align-items: center; }
.nav-inner { display: flex; align-items: center; justify-content: space-between; width: 100%; }
.nav-back { display: flex; align-items: center; gap: 8px; font-size: 14px; font-weight: 500; color: var(--ink-secondary); transition: color 0.15s ease; }
.nav-back:hover { color: var(--ink-primary); }
.nav-back svg { width: 16px; height: 16px; stroke: currentColor; fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

.page-header { padding: 64px 0 48px; border-bottom: 1px solid var(--border); }
.page-header-inner { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 48px; align-items: end; }
.header-label { font-size: 12px; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-tertiary); margin-bottom: 16px; }
.header-h1 { font-family: 'Cabinet Grotesk', sans-serif; font-weight: 800; font-size: clamp(28px, 3.5vw, 42px); letter-spacing: -0.025em; line-height: 1.1; color: var(--ink-primary); max-width: 16ch; }
.header-sub { font-size: 16px; color: var(--ink-secondary); line-height: 1.65; max-width: 44ch; }

.content-area { padding: 56px 0 96px; }
.content-layout { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 48px; align-items: start; }

.toc { position: sticky; top: calc(var(--nav-h) + 24px); }
.toc-label { font-size: 11px; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-tertiary); margin-bottom: 12px; }
.toc-list { list-style: none; display: flex; flex-direction: column; gap: 4px; }
.toc-list a { display: block; font-size: 13px; font-weight: 500; color: var(--ink-secondary); padding: 8px 12px; border-radius: var(--radius-sm); transition: background 0.12s ease, color 0.12s ease; }
.toc-list a:hover { background: var(--surface-2); color: var(--ink-primary); }

.resource-main { min-width: 0; }
.resource-section { margin-bottom: 48px; scroll-margin-top: calc(var(--nav-h) + 20px); }
.resource-section:last-child { margin-bottom: 0; }
.section-tag { font-size: 11px; font-weight: 700; letter-spacing: 0.07em; text-transform: uppercase; color: var(--ink-tertiary); margin-bottom: 10px; }
.section-title { font-family: 'Cabinet Grotesk', sans-serif; font-size: clamp(22px, 2.5vw, 28px); font-weight: 800; letter-spacing: -0.02em; line-height: 1.2; margin-bottom: 14px; }
.section-lead { font-size: 15px; color: var(--ink-secondary); line-height: 1.7; max-width: 62ch; margin-bottom: 24px; }

.method-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.method-card { background: var(--surface-2); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 22px 22px 20px; }
.method-card h3 { font-family: 'Cabinet Grotesk', sans-serif; font-size: 16px; font-weight: 800; letter-spacing: -0.02em; margin-bottom: 8px; }
.method-card p { font-size: 13px; color: var(--ink-secondary); line-height: 1.65; margin-bottom: 10px; }
.method-card-meta { font-size: 12px; font-weight: 600; color: var(--ink-primary); }

.step-list { display: flex; flex-direction: column; gap: 12px; }
.step-item { display: grid; grid-template-columns: 36px minmax(0, 1fr); gap: 16px; background: var(--surface-2); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 20px 22px; }
.step-num { width: 36px; height: 36px; border-radius: 50%; background: var(--ink-primary); color: #fff; font-size: 14px; font-weight: 700; display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.step-item h3 { font-size: 15px; font-weight: 700; margin-bottom: 6px; }
.step-item p { font-size: 14px; color: var(--ink-secondary); line-height: 1.65; }

.check-list { background: var(--surface-2); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 22px 24px; }
.check-list ul { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.check-list li { display: flex; gap: 12px; font-size: 14px; color: var(--ink-secondary); line-height: 1.6; }
.check-list li::before { content: ''; width: 18px; height: 18px; flex-shrink: 0; margin-top: 2px; border: 1.5px solid var(--border-strong); border-radius: 4px; background: var(--surface); }

.template-block { background: var(--surface-2); border: 1px solid var(--border); border-radius: var(--radius-lg); overflow: hidden; margin-bottom: 16px; }
.template-block-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 14px 18px; background: var(--surface-3); border-bottom: 1px solid var(--border); }
.template-block-head h3 { font-size: 14px; font-weight: 700; }
.template-block-body { padding: 18px 20px; font-size: 14px; color: var(--ink-secondary); line-height: 1.75; white-space: pre-wrap; font-family: inherit; }
.copy-btn { font-size: 12px; font-weight: 600; color: var(--ink-primary); background: var(--surface); border: 1px solid var(--border-strong); border-radius: var(--radius-sm); padding: 6px 12px; cursor: pointer; font-family: inherit; transition: background 0.12s ease; }
.copy-btn:hover { background: var(--surface-2); }
.copy-btn.copied { color: #166534; border-color: #86efac; background: #f0fdf4; }

.info-box { padding: 18px 20px; background: var(--surface-2); border-left: 3px solid var(--ink-primary); border-radius: 0 var(--radius-md) var(--radius-md) 0; font-size: 14px; color: var(--ink-secondary); line-height: 1.65; margin-top: 20px; }
.info-box strong { color: var(--ink-primary); }

.cta-box { margin-top: 56px; padding: 32px 36px; background: var(--surface-2); border: 1px solid var(--border); border-radius: var(--radius-lg); display: grid; grid-template-columns: 1fr auto; gap: 24px; align-items: center; }
.cta-box h2 { font-family: 'Cabinet Grotesk', sans-serif; font-size: 22px; font-weight: 800; letter-spacing: -0.02em; margin-bottom: 8px; }
.cta-box p { font-size: 14px; color: var(--ink-secondary); max-width: 48ch; line-height: 1.65; }
.cta-actions { display: flex; flex-wrap: wrap; gap: 10px; }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; font-size: 14px; font-weight: 600; border-radius: var(--radius-md); padding: 11px 20px; border: 1px solid transparent; transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease, transform 0.12s var(--ease-out); cursor: pointer; font-family: inherit; white-space: nowrap; }
.btn:active { transform: scale(0.98); }
.btn-primary { background: var(--ink-primary); color: #fff; }
.btn-primary:hover { background: #1e293b; }
.btn-secondary { background: transparent; color: var(--ink-primary); border-color: var(--border-strong); }
.btn-secondary:hover { background: var(--surface-3); }

.footer { padding: 40px 0; border-top: 1px solid var(--border); }
.footer-inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px; }
.footer-copy { font-size: 12px; color: var(--ink-tertiary); }
.footer-links { display: flex; gap: 20px; }
.footer-links a { font-size: 12px; color: var(--ink-tertiary); transition: color 0.12s ease; }
.footer-links a:hover { color: var(--ink-secondary); }

@media (max-width: 960px) {
  .content-layout { grid-template-columns: 1fr; }
  .toc { position: static; margin-bottom: 8px; }
  .toc-list { flex-direction: row; flex-wrap: wrap; }
  .method-grid { grid-template-columns: 1fr; }
  .cta-box { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .container { padding: 0 16px; }
  .page-header-inner { grid-template-columns: 1fr; gap: 20px; }
}