*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--blue:#007aff;--bg:#f2f2f7;--s1:#ffffff;--s2:#ebebf0;--l1:#000000;--l2:rgba(60,60,67,.82);--l3:rgba(60,60,67,.52);--l4:rgba(60,60,67,.28);--sep:rgba(60,60,67,.1);--card-shadow:0 2px 16px rgba(0,0,0,.05),0 0 0 .5px rgba(0,0,0,.04);--rc:18px;--safe-top:env(safe-area-inset-top,0px);--safe-bot:env(safe-area-inset-bottom,0px);--safe-l:env(safe-area-inset-left,0px);--safe-r:env(safe-area-inset-right,0px)}[data-theme=dark]{--bg:#000000;--s1:#1c1c1e;--s2:#2c2c2e;--l1:#ffffff;--l2:rgba(235,235,245,.82);--l3:rgba(235,235,245,.52);--l4:rgba(235,235,245,.28);--sep:rgba(235,235,245,.1);--card-shadow:0 2px 16px rgba(0,0,0,.28),0 0 0 .5px rgba(255,255,255,.05)}html{-webkit-tap-highlight-color:transparent;scroll-behavior:smooth}body{font-family:-apple-system,BlinkMacSystemFont,SF Pro Display,SF Pro Text,Helvetica Neue,Arial,sans-serif;background:var(--bg);color:var(--l1);min-height:100vh;padding-bottom:calc(56px + var(--safe-bot));padding-left:var(--safe-l);padding-right:var(--safe-r);-webkit-font-smoothing:antialiased}.page{max-width:680px;margin:0 auto;padding:0 16px}.nav{display:flex;align-items:center;padding:calc(14px + var(--safe-top)) 0 6px;gap:4px}.back-btn{display:flex;align-items:center;gap:2px;background:none;border:none;color:var(--blue);font-size:17px;font-family:inherit;cursor:pointer;padding:6px 0;min-height:44px;-webkit-tap-highlight-color:transparent}.back-btn:active{opacity:.6}.back-chevron{font-size:22px;font-weight:300;line-height:1}.theme-toggle{margin-left:auto;background:var(--s2);border:none;width:38px;height:38px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:18px;cursor:pointer;-webkit-tap-highlight-color:transparent;transition:opacity .15s}.theme-toggle:active{opacity:.7}.page-header{padding:12px 0 4px}.page-meta{display:flex;align-items:center;gap:10px;margin-bottom:10px}.page-tag{font-size:11px;font-weight:600;color:var(--blue);letter-spacing:.8px;text-transform:uppercase}.page-stand{font-size:11px;color:var(--l4);letter-spacing:.2px}.page-title{font-size:36px;font-weight:700;letter-spacing:-.8px;line-height:1.08;padding-bottom:8px}.page-subtitle{font-size:15px;color:var(--l3);line-height:1.55;padding-bottom:8px}.card{background:var(--s1);border-radius:var(--rc);box-shadow:var(--card-shadow);padding:22px 22px 20px;margin-top:14px}.card-icon{width:40px;height:40px;border-radius:12px;background:var(--s2);display:flex;align-items:center;justify-content:center;margin-bottom:14px;color:var(--l2)}h2{font-size:17px;font-weight:600;color:var(--l1);margin-bottom:10px;letter-spacing:-.2px}p{font-size:15px;line-height:1.72;color:var(--l2)}p+p{margin-top:10px}strong{color:var(--l1);font-weight:500}a{color:var(--blue);text-decoration:none}a:hover{text-decoration:underline}.footer{text-align:center;padding:44px 0 12px;font-size:12px}.footer-links{display:flex;justify-content:center;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:10px}.footer-links a{color:var(--l3);text-decoration:none}.footer-links a:hover{color:var(--l2);text-decoration:underline}.footer-links span{color:var(--l4)}.footer-note{color:var(--l4);line-height:1.7;max-width:380px;margin:0 auto}