/* ================= shared site chrome (header, footer, theme, tokens) ================= */
:root{
  color-scheme:only light;
  --ink:#F6F5F0;--panel:#FFFFFF;--panel-2:#EFEEE8;--line:#E2E1D8;
  --fg:#16161B;--muted:#5D5D66;--muted-2:#6C6C76;--signal:#127A44;
  --display:'Space Grotesk',sans-serif;--body:'IBM Plex Sans',sans-serif;--mono:'IBM Plex Mono',monospace;
  --maxw:1180px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;background:#F6F5F0}
body{background:var(--ink);color:var(--fg);font-family:var(--body);font-size:17px;line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit;text-decoration:none}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 28px}
a:focus-visible,button:focus-visible,input:focus-visible{outline:2px solid var(--signal);outline-offset:3px;border-radius:4px}
.eyebrow{font-family:var(--mono);font-size:12px;font-weight:600;letter-spacing:.22em;text-transform:uppercase;color:var(--muted-2)}

/* buttons */
.btn{font-family:var(--body);font-weight:600;font-size:14.5px;padding:11px 20px;border-radius:10px;border:1px solid transparent;cursor:pointer;transition:transform .12s,background .18s,border-color .18s,color .18s;display:inline-flex;align-items:center;gap:8px;white-space:nowrap;flex-shrink:0}
.btn-primary{background:var(--fg);color:#FCFBF7}
.btn-primary:hover{background:#000;transform:translateY(-1px)}
.btn-ghost{background:transparent;color:var(--fg);border-color:#CFCEC5}
.btn-ghost:hover{border-color:#9d9c93}
.btn-block{width:100%;justify-content:center;padding:15px 20px;font-size:16px}

/* header / nav */
header{position:sticky;top:0;z-index:50;background:rgba(246,245,240,.85);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:68px;gap:18px}
.brand{font-family:var(--display);font-weight:700;font-size:19px;letter-spacing:-.01em;white-space:nowrap;flex-shrink:0}
.brand .dot{color:var(--signal)}
.nav-links{display:flex;gap:22px;flex-wrap:nowrap}
.nav-links a{font-size:14.5px;color:var(--muted);white-space:nowrap;transition:color .18s}
.nav-links a:hover,.nav-links a.active{color:var(--fg)}
.nav-right{display:flex;align-items:center;gap:16px;flex-shrink:0}
.nav-login{font-size:14.5px;color:var(--muted)}
.nav-login:hover{color:var(--fg)}
.menu-btn{display:none;width:44px;height:44px;padding:0;border:1px solid var(--line);border-radius:11px;background:transparent;align-items:center;justify-content:center;cursor:pointer;transition:border-color .18s}
.menu-btn:hover{border-color:#9d9c93}
.menu-btn .bars{position:relative;width:18px;height:12px;display:block}
.menu-btn .bars span{position:absolute;left:0;right:0;height:2px;border-radius:2px;background:var(--fg);transition:transform .22s ease,opacity .18s ease}
.menu-btn .bars span:nth-child(1){top:0}
.menu-btn .bars span:nth-child(2){top:5px}
.menu-btn .bars span:nth-child(3){top:10px}
.menu-btn[aria-expanded="true"] .bars span:nth-child(1){transform:translateY(5px) rotate(45deg)}
.menu-btn[aria-expanded="true"] .bars span:nth-child(2){opacity:0}
.menu-btn[aria-expanded="true"] .bars span:nth-child(3){transform:translateY(-5px) rotate(-45deg)}

/* theme toggle */
.theme-btn{width:44px;height:44px;padding:0;border:1px solid var(--line);border-radius:11px;background:transparent;display:inline-flex;align-items:center;justify-content:center;cursor:pointer;transition:border-color .18s;color:var(--muted)}
.theme-btn:hover{border-color:#9d9c93;color:var(--fg)}
.theme-btn svg{width:19px;height:19px}
.theme-btn .ico-moon{display:block}
.theme-btn .ico-sun{display:none}
html[data-theme="dark"] .theme-btn .ico-moon{display:none}
html[data-theme="dark"] .theme-btn .ico-sun{display:block}

/* mobile menu */
.mobile-menu{display:none;padding:12px 28px 22px;border-top:1px solid var(--line);background:var(--ink)}
.mobile-menu.open{display:block}
.mobile-menu a{display:block;padding:13px 2px;font-size:16px;color:var(--fg);border-bottom:1px solid var(--line)}
.mobile-menu a.active{color:var(--signal)}
.mobile-menu .mm-login{color:var(--muted)}
.mobile-menu .btn-block{margin-top:16px}

/* breadcrumbs (article pages) */
.crumbs{padding:18px 0 0;font-family:var(--mono);font-size:12px;color:var(--muted-2)}
.crumbs a:hover{color:var(--fg)}

/* footer */
footer{padding:52px 0 40px;border-top:1px solid var(--line)}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:36px;padding-bottom:34px;border-bottom:1px solid var(--line);margin-bottom:22px}
.foot-brand .brand{font-size:18px}
.foot-brand p{color:var(--muted);font-size:14px;line-height:1.6;margin-top:12px;max-width:32ch}
.foot-brand a.mail{display:inline-block;margin-top:12px;font-family:var(--mono);font-size:13px;color:var(--signal)}
.fc-t{font-family:var(--mono);font-size:11px;font-weight:600;letter-spacing:.2em;color:var(--muted-2);margin-bottom:14px}
.foot-col a{display:block;padding:4.5px 0;font-size:14px;color:var(--muted)}
.foot-col a:hover{color:var(--fg)}
.foot-fine{color:var(--muted-2);font-size:13px}
.foot-fine .brand-sm{font-family:var(--display);font-weight:700;letter-spacing:0;color:var(--fg)}

/* dark theme tokens + chrome overrides */
html[data-theme="dark"]{color-scheme:only dark;background:#0B0B0D;--ink:#0B0B0D;--panel:#16161A;--panel-2:#1D1D22;--line:#2A2A31;--fg:#F5F4F1;--muted:#9A9AA2;--muted-2:#84848D;--signal:#63D28C}
html[data-theme="dark"] header{background:rgba(11,11,13,.82)}
html[data-theme="dark"] .btn-primary{background:var(--fg);color:#111}
html[data-theme="dark"] .btn-primary:hover{background:#fff}
html[data-theme="dark"] .btn-ghost{border-color:var(--line)}
html[data-theme="dark"] .btn-ghost:hover{border-color:#4a4a54}
html[data-theme="dark"] .theme-btn:hover,
html[data-theme="dark"] .menu-btn:hover{border-color:#4a4a54}

/* responsive */
@media(max-width:1240px){.nav-links{display:none}.menu-btn{display:inline-flex}}
@media(max-width:820px){.foot-grid{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.wrap{padding:0 20px}.nav-right{gap:12px}.nav-right .nav-login{display:none}.hide-mobile{display:none}.brand{font-size:16px;letter-spacing:-.01em}}
@media(max-width:520px){.foot-grid{grid-template-columns:1fr}}

/* in-content cross-links + "explore" block */
.xlink{color:var(--signal);text-decoration:underline;text-underline-offset:3px}
.xlink:hover{opacity:.82}
.explore{border-top:1px solid var(--line);padding:64px 0}
.explore .eyebrow{display:block;margin-bottom:12px}
.explore h2{font-family:var(--display);font-weight:700;font-size:clamp(24px,3vw,34px);letter-spacing:-.015em;margin-bottom:26px}
.explore-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.explore-grid a{display:flex;justify-content:space-between;align-items:center;gap:12px;background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:16px 18px;font-family:var(--display);font-weight:700;font-size:15px;color:var(--fg);transition:border-color .2s,transform .12s}
.explore-grid a:hover{border-color:rgba(24,154,87,.5);transform:translateY(-2px)}
.explore-grid a span{color:var(--signal);font-family:var(--mono)}
@media(max-width:820px){.explore-grid{grid-template-columns:1fr 1fr}}
@media(max-width:520px){.explore-grid{grid-template-columns:1fr}}

/* FAQ block (used on landing + article pages) */
.faq{border-top:1px solid var(--line)}
.faq-title{font-family:var(--display);font-weight:700;font-size:clamp(24px,3.4vw,38px);letter-spacing:-.015em;margin-bottom:28px}
.faq details{background:var(--panel);border:1px solid var(--line);border-radius:14px;margin-bottom:12px;overflow:hidden;box-shadow:0 1px 3px rgba(22,22,27,.05)}
.faq summary{cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:16px;padding:19px 24px;font-family:var(--display);font-weight:700;font-size:16px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-family:var(--mono);font-size:20px;color:var(--muted-2);transition:transform .2s}
.faq details[open] summary::after{transform:rotate(45deg);color:var(--signal)}
.faq details p{color:var(--muted);font-size:15px;line-height:1.65;padding:0 24px 20px;max-width:75ch}
.faq details p a{color:var(--signal);text-decoration:underline;text-underline-offset:2px}
html[data-theme="dark"] .faq details{box-shadow:none}