/* Putty.info — technical, trustworthy educational UI */
:root {
  --bg: #f4f7f8;
  --bg-elevated: #ffffff;
  --ink: #11222c;
  --ink-muted: #3d5560;
  --accent: #0d7377;
  --accent-2: #14919b;
  --accent-deep: #0b5c5f;
  --border: #d5e1e6;
  --warn: #9a3412;
  --warn-bg: #fff7ed;
  --danger: #991b1b;
  --danger-bg: #fef2f2;
  --ok: #065f46;
  --ok-bg: #ecfdf5;
  --footer-bg: #0b1b24;
  --footer-ink: #d7e6ea;
  --radius: 10px;
  --shadow: 0 10px 30px rgba(17, 34, 44, 0.08);
  --font: "IBM Plex Sans", "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Consolas, monospace;
  --max: 1120px;
  --narrow: 760px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation: none !important; transition: none !important; }
}
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(1200px 500px at 10% -10%, rgba(13,115,119,.12), transparent 60%),
    radial-gradient(900px 400px at 100% 0%, rgba(20,145,155,.10), transparent 55%),
    linear-gradient(180deg, #eef5f6 0%, var(--bg) 220px);
  line-height: 1.6;
  min-height: 100vh;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent-deep); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--accent); }
.skip-link {
  position: absolute; left: -9999px; top: 0; background: var(--accent); color: #fff; padding: .6rem 1rem; z-index: 1000;
}
.skip-link:focus { left: .5rem; top: .5rem; }
.wrap { width: min(100% - 2rem, var(--max)); margin-inline: auto; }
.narrow { width: min(100% - 2rem, var(--narrow)); margin-inline: auto; }

/* Header */
.site-header {
  background: rgba(255,255,255,.92);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(10px);
  position: sticky; top: 0; z-index: 50;
}
.disclosure-bar {
  background: #12343a;
  color: #d9eef0;
  font-size: .82rem;
  padding: .45rem 0;
}
.disclosure-bar .wrap { display: flex; gap: .75rem; align-items: flex-start; }
.header-inner {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding: .75rem 0;
}
.brand {
  display: flex; align-items: center; gap: .75rem; text-decoration: none; color: inherit;
}
.brand img { width: 44px; height: 44px; }
.brand-text strong { display: block; font-size: 1.25rem; letter-spacing: -.02em; }
.brand-text span { display: block; font-size: .78rem; color: var(--ink-muted); max-width: 18rem; }
.nav-main { display: flex; flex-wrap: wrap; gap: .35rem .9rem; align-items: center; }
.nav-main a {
  text-decoration: none; color: var(--ink); font-weight: 500; font-size: .95rem;
  padding: .35rem 0; border-bottom: 2px solid transparent;
}
.nav-main a:hover, .nav-main a[aria-current="page"] { border-color: var(--accent); color: var(--accent-deep); }
.header-actions { display: flex; gap: .5rem; align-items: center; }
.search-form { display: flex; gap: .35rem; }
.search-form input {
  border: 1px solid var(--border); border-radius: 999px; padding: .45rem .85rem; min-width: 10rem;
  font: inherit; background: #fff;
}
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .4rem;
  border: 1px solid transparent; border-radius: 999px; padding: .55rem 1.05rem;
  font: inherit; font-weight: 600; cursor: pointer; text-decoration: none;
  transition: transform .15s ease, background .15s ease;
}
.btn:focus-visible, a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
  outline: 3px solid rgba(13,115,119,.45); outline-offset: 2px;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-2); color: #fff; }
.btn-secondary { background: #fff; border-color: var(--border); color: var(--ink); }
.btn-secondary:hover { border-color: var(--accent); color: var(--accent-deep); }
.btn-danger-outline { background: var(--danger-bg); color: var(--danger); border-color: #fecaca; }
.menu-toggle { display: none; }

/* Hero / sections */
.hero {
  padding: 2.5rem 0 1.5rem;
  display: grid; gap: 1.5rem;
  grid-template-columns: 1.4fr 1fr;
  align-items: start;
}
.hero h1 {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  line-height: 1.15; letter-spacing: -.03em; margin: 0 0 .75rem;
}
.lede { font-size: 1.05rem; color: var(--ink-muted); margin: 0 0 1.25rem; max-width: 40rem; }
.cta-row { display: flex; flex-wrap: wrap; gap: .6rem; margin-bottom: 1rem; }
.release-card, .panel, .tool-card, .task-card {
  background: var(--bg-elevated); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 1.15rem 1.25rem;
}
.release-card h2, .panel h2 { margin-top: 0; font-size: 1.1rem; }
.release-subhead { font-size: .95rem; margin: 1rem 0 .4rem; }
.release-file-list { list-style: none; padding: 0; margin: 0; display: grid; gap: .45rem; }
.release-file-list li { display: grid; gap: .1rem; padding: .45rem .55rem; background: rgba(13,115,119,.06); border-radius: 8px; }
.release-file-list a { font-weight: 600; }
.release-recommend-label { font-weight: 600; margin: .75rem 0 .35rem; font-size: .95rem; }
.release-other { margin-top: .85rem; }
.release-other summary { cursor: pointer; font-weight: 600; }
.flash-success { background: #ecfdf5; border: 1px solid #a7f3d0; color: #065f46; padding: .85rem 1rem; border-radius: var(--radius); margin: 1rem 0; }
.flash-error { background: var(--danger-bg); border: 1px solid #fecaca; color: var(--danger); padding: .85rem 1rem; border-radius: var(--radius); margin: 1rem 0; }
.contact-form label { display: block; margin: .75rem 0 .35rem; font-weight: 600; }
.contact-form input[type="text"], .contact-form input[type="email"], .contact-form select, .contact-form textarea {
  width: 100%; padding: .65rem .75rem; border: 1px solid #cbd5e1; border-radius: 8px; font: inherit;
}
.contact-form textarea { min-height: 140px; resize: vertical; }
.contact-ticket-panel { margin-top: 1rem; }
.meta-line { color: var(--ink-muted); font-size: .9rem; }
.badge {
  display: inline-block; font-size: .75rem; font-weight: 700; letter-spacing: .04em;
  text-transform: uppercase; background: var(--ok-bg); color: var(--ok);
  border-radius: 999px; padding: .2rem .55rem;
}
.section { padding: 2rem 0; }
.section h2 { font-size: 1.45rem; letter-spacing: -.02em; margin: 0 0 .5rem; }
.section-intro { color: var(--ink-muted); margin: 0 0 1.25rem; max-width: 42rem; }
.grid-3 { display: grid; gap: 1rem; grid-template-columns: repeat(3, 1fr); }
.grid-2 { display: grid; gap: 1rem; grid-template-columns: repeat(2, 1fr); }
.task-card h3, .tool-card h3 { margin: 0 0 .4rem; font-size: 1.05rem; }
.task-card p, .tool-card p { margin: 0; color: var(--ink-muted); font-size: .95rem; }
.path-list { list-style: none; padding: 0; margin: 0; }
.path-list li { border-bottom: 1px solid var(--border); }
.path-list a {
  display: block; padding: .7rem 0; text-decoration: none; color: var(--ink); font-weight: 500;
}
.path-list a:hover { color: var(--accent); }

/* Content pages */
.breadcrumbs { font-size: .88rem; color: var(--ink-muted); margin: 1rem 0; }
.breadcrumbs ol { list-style: none; display: flex; flex-wrap: wrap; gap: .35rem; padding: 0; margin: 0; }
.breadcrumbs li:not(:last-child)::after { content: "/"; margin-left: .35rem; color: #8aa0a8; }
.article-layout {
  display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: 2rem; padding-bottom: 3rem;
}
.article-body h1 { font-size: clamp(1.6rem, 3vw, 2.2rem); letter-spacing: -.02em; }
.article-body h2 { margin-top: 2rem; font-size: 1.3rem; }
.article-body h3 { margin-top: 1.4rem; font-size: 1.08rem; }
.article-body p, .article-body li { max-width: 70ch; }
.article-meta { color: var(--ink-muted); font-size: .9rem; margin-bottom: 1rem; }
.callout, .warning, .danger {
  border-radius: var(--radius); padding: 1rem 1.1rem; margin: 1.2rem 0; border: 1px solid;
}
.callout { background: #f0fafa; border-color: #b7e0e2; }
.warning { background: var(--warn-bg); border-color: #fdba74; color: var(--warn); }
.danger { background: var(--danger-bg); border-color: #fecaca; color: var(--danger); }
.sources { margin-top: 2.5rem; padding-top: 1rem; border-top: 1px solid var(--border); }
.sources li { margin-bottom: .4rem; }
.sidebar-sticky { position: sticky; top: 5.5rem; display: grid; gap: 1rem; }
pre, code, .cmd {
  font-family: var(--mono); font-size: .9em;
}
pre {
  background: #0f222b; color: #e7f3f5; padding: 1rem; border-radius: var(--radius);
  overflow-x: auto; line-height: 1.45;
}
.cmd-box {
  background: #0f222b; color: #e7f3f5; border-radius: var(--radius); padding: 1rem;
  position: relative; margin: .8rem 0;
}
.cmd-box button {
  position: absolute; top: .5rem; right: .5rem;
  font-size: .8rem; border: 0; border-radius: 6px; padding: .3rem .55rem; cursor: pointer;
}
.related a { display: block; margin: .35rem 0; }

/* Tools */
.tool-form { display: grid; gap: .85rem; max-width: 40rem; }
.tool-form label { display: grid; gap: .3rem; font-weight: 600; font-size: .92rem; }
.tool-form input, .tool-form select, .tool-form textarea {
  font: inherit; padding: .55rem .7rem; border: 1px solid var(--border); border-radius: 8px; width: 100%;
}
.steps-list { counter-reset: step; list-style: none; padding: 0; }
.steps-list > li {
  counter-increment: step; background: #fff; border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1rem 1rem 1rem 3rem; margin-bottom: .75rem; position: relative;
}
.steps-list > li::before {
  content: counter(step); position: absolute; left: .85rem; top: .95rem;
  width: 1.5rem; height: 1.5rem; border-radius: 999px; background: var(--accent); color: #fff;
  display: grid; place-items: center; font-size: .8rem; font-weight: 700;
}
.result-errors { background: var(--danger-bg); border: 1px solid #fecaca; color: var(--danger); padding: 1rem; border-radius: var(--radius); }

/* Ads collapse empty */
.ad-slot:empty, .ks-ad-slot:empty { display: none; }
.ad-slot, .ks-ad-slot {
  margin: 1rem 0; min-height: 0;
}
.ad-slot__label, .ks-ad-label {
  display: block; font-size: .72rem; text-transform: uppercase; letter-spacing: .06em; color: #6b8088; margin-bottom: .35rem;
}
.ks-ad { display: block; border: 1px dashed var(--border); border-radius: 8px; padding: .75rem; text-decoration: none; color: inherit; }

/* Footer */
.site-footer {
  background: var(--footer-bg); color: var(--footer-ink); margin-top: 3rem; padding: 2.5rem 0 1.5rem;
}
.site-footer a { color: #9fd4d8; }
.footer-grid {
  display: grid; grid-template-columns: 1.4fr repeat(3, 1fr); gap: 1.5rem; margin-bottom: 1.5rem;
}
.site-footer h2 { font-size: .95rem; color: #fff; margin: 0 0 .7rem; }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin: .35rem 0; }
.footer-disclosure {
  border-top: 1px solid rgba(255,255,255,.12); padding-top: 1rem; font-size: .85rem; color: #a9c0c6;
}
.footer-bottom {
  display: flex; flex-wrap: wrap; gap: 1rem; justify-content: space-between; align-items: center;
  margin-top: 1rem; font-size: .85rem; color: #8ea7ae;
}

/* Admin */
.admin-layout { display: grid; grid-template-columns: 240px 1fr; min-height: 100vh; background: #edf2f4; }
.admin-nav { background: #0b1b24; color: #d7e6ea; padding: 1.25rem 1rem; }
.admin-nav a { display: block; color: #c5dde2; text-decoration: none; padding: .45rem .5rem; border-radius: 6px; margin-bottom: .2rem; }
.admin-nav a:hover { background: rgba(255,255,255,.08); }
.admin-main { padding: 1.5rem; }
.admin-table { width: 100%; border-collapse: collapse; background: #fff; }
.admin-table th, .admin-table td { border: 1px solid var(--border); padding: .55rem .7rem; text-align: left; font-size: .92rem; }
.stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; margin-bottom: 1.5rem; }
.stat { background: #fff; border: 1px solid var(--border); border-radius: 10px; padding: 1rem; }
.stat strong { display: block; font-size: 1.6rem; }

/* FAQ */
.faq details { border: 1px solid var(--border); border-radius: 8px; background: #fff; padding: .7rem 1rem; margin-bottom: .5rem; }
.faq summary { cursor: pointer; font-weight: 600; }

/* Responsive */
@media (max-width: 900px) {
  .hero, .article-layout, .grid-3, .footer-grid, .admin-layout, .stat-grid, .grid-2 {
    grid-template-columns: 1fr;
  }
  .menu-toggle { display: inline-flex; }
  .nav-main { display: none; width: 100%; flex-direction: column; align-items: flex-start; }
  .nav-main.is-open { display: flex; }
  .header-inner { flex-wrap: wrap; }
  .sidebar-sticky { position: static; }
}
@media (max-width: 520px) {
  .search-form input { min-width: 0; width: 100%; }
  .brand-text span { display: none; }
}