/*
Theme Name: oopbuy signal
Theme URI: https://sheetcn.com/
Author: oopbuy signal Team
Description: An editorial, signal-dispatch SEO WordPress theme for the oopbuy Signal spreadsheet shopping guide. Signal orange + midnight ink + mist blue palette.
Version: 1.0.0
Requires at least: 5.8
Requires PHP: 7.4
License: GPLv2 or later
License URI: https://www.gnu.org/licenses/gpl-2.0.html
Text Domain: oopbuy-signal
*/

:root {
  --color-bg: #f8f6ee;
  --color-surface: #ffffff;
  --color-accent: #ea580c;
  --color-accent-dark: #c2410c;
  --color-accent-2: #0f1c3f;
  --color-accent-3: #d6e4f1;
  --color-text: #0d1222;
  --color-text-muted: #556577;
  --color-border: #e4e1cf;
  --ff-serif: "IBM Plex Serif", Georgia, serif;
  --ff-sans: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 18px;
  --shadow-sm: 0 2px 6px rgba(13,18,34,0.06);
  --shadow-md: 0 10px 24px rgba(13,18,34,0.10);
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0a0f1f;
    --color-surface: #141b35;
    --color-accent: #fb923c;
    --color-accent-dark: #f97316;
    --color-accent-2: #a0bedb;
    --color-accent-3: #1e2b50;
    --color-text: #f1efe7;
    --color-text-muted: #a3adc0;
    --color-border: #223055;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--ff-sans);
  font-size: 16px;
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--color-accent); text-decoration: none; transition: color 0.15s ease; }
a:hover { color: var(--color-accent-dark); }
a:focus-visible, button:focus-visible, summary:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 3px; }

h1, h2, h3, h4 { font-family: var(--ff-serif); color: var(--color-text); line-height: 1.25; margin: 0 0 16px; }
h1 { font-size: clamp(32px, 4.6vw, 54px); font-weight: 700; font-style: italic; }
h2 { font-size: clamp(24px, 2.8vw, 34px); font-weight: 700; margin-top: 36px; }
h3 { font-size: 20px; font-weight: 700; margin-top: 24px; }
p { margin: 0 0 16px; }
ul { margin: 0 0 16px; padding-left: 22px; }
blockquote {
  margin: 20px 0;
  padding: 16px 20px;
  border-left: 4px solid var(--color-accent);
  background: var(--color-accent-3);
  font-family: var(--ff-serif);
  font-style: italic;
  color: var(--color-accent-2);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* Announcement bar */
.announce {
  background: var(--color-accent-2);
  color: var(--color-bg);
  font-family: var(--ff-sans);
  font-size: 13px;
  text-align: center;
  padding: 10px 16px;
  letter-spacing: 0.03em;
}

/* Header */
.site-header {
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}
.masthead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: nowrap;
  padding: 16px 0;
  gap: 24px;
}
.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  font-family: var(--ff-serif);
  font-weight: 700;
  font-size: 24px;
  color: var(--color-accent-2);
  text-decoration: none;
  flex-shrink: 0;
  line-height: 1.1;
}
.brand .tag {
  font-family: var(--ff-sans);
  font-weight: 500;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
}
.nav-primary {
  display: flex;
  align-items: center;
  gap: 24px;
  flex: 1;
  justify-content: flex-end;
}
.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 20px;
  align-items: center;
}
.nav-item { position: relative; }
.nav-item > a,
.nav-item > details > summary {
  color: var(--color-text);
  font-family: var(--ff-sans);
  font-weight: 500;
  font-size: 15px;
  padding: 8px 2px;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  list-style: none;
  user-select: none;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.nav-item > details > summary::-webkit-details-marker { display: none; }
.nav-item > details > summary::marker { content: ""; }
.nav-item > a:hover,
.nav-item > details > summary:hover,
.nav-item > details[open] > summary {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}
.nav-item .arrow {
  font-size: 10px;
  transition: transform 0.2s ease;
  line-height: 1;
}
.nav-item > details[open] > summary .arrow { transform: rotate(180deg); }
.nav-details { position: static; }
.nav-sub {
  position: absolute;
  top: calc(100% + 10px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: 0 10px 30px rgba(15,28,63,0.14);
  min-width: 260px;
  padding: 10px;
  list-style: none;
  margin: 0;
  z-index: 60;
}
.nav-sub li { list-style: none; margin: 0; }
.nav-sub a {
  display: block;
  padding: 10px 14px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--color-text);
  font-family: var(--ff-sans);
  font-weight: 500;
  text-decoration: none;
  transition: background 0.15s ease, color 0.15s ease;
}
.nav-sub a:hover {
  background: rgba(234,88,12,0.08);
  color: var(--color-accent);
}
.cta-group {
  display: inline-flex;
  gap: 10px;
  align-items: center;
  flex-shrink: 0;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 20px;
  border-radius: 999px;
  font-family: var(--ff-sans);
  font-weight: 600;
  font-size: 14px;
  text-decoration: none;
  cursor: pointer;
  border: 2px solid transparent;
  transition: transform 0.15s ease, box-shadow 0.2s ease, background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
  white-space: nowrap;
}
.btn-primary { background: var(--color-accent); color: #ffffff; border-color: var(--color-accent); }
.btn-primary:hover { background: var(--color-accent-dark); border-color: var(--color-accent-dark); color: #ffffff; transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn-secondary { background: transparent; color: var(--color-accent-2); border-color: var(--color-accent-2); }
.btn-secondary:hover { background: var(--color-accent-2); color: #ffffff; }
.btn-ghost { background: transparent; color: #ffffff; border-color: rgba(255,255,255,0.75); }
.btn-ghost:hover { background: rgba(255,255,255,0.12); border-color: #ffffff; }

/* Mobile hamburger */
.menu-toggle {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}
.menu-toggle-label {
  display: none;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  padding: 10px 14px;
  background: var(--color-accent);
  color: #ffffff;
  border-radius: var(--radius-md);
  font-family: var(--ff-sans);
  font-weight: 600;
  font-size: 14px;
  user-select: none;
}
.menu-toggle-label .hamburger-icon { font-size: 18px; line-height: 1; }

@media (max-width: 960px) {
  .masthead { flex-wrap: wrap; gap: 16px; padding: 14px 0; }
  .menu-toggle-label { display: inline-flex; }
  .nav-primary {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
    padding-top: 10px;
    border-top: 1px solid var(--color-border);
    margin-top: 4px;
  }
  .menu-toggle:checked ~ .nav-primary { display: flex; }
  .nav-list { flex-direction: column; width: 100%; gap: 2px; align-items: stretch; }
  .nav-item { width: 100%; }
  .nav-item > a,
  .nav-item > details > summary {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    justify-content: space-between;
    background: var(--color-surface);
  }
  .nav-item > a:hover,
  .nav-item > details > summary:hover,
  .nav-item > details[open] > summary {
    border-color: var(--color-accent);
    background: rgba(234,88,12,0.06);
  }
  .nav-sub {
    position: static;
    transform: none;
    box-shadow: none;
    border: 1px solid var(--color-border);
    border-top: none;
    border-radius: 0 0 var(--radius-sm) var(--radius-sm);
    margin: -2px 8px 6px 8px;
    min-width: 0;
    padding: 6px;
  }
  .cta-group { width: 100%; flex-wrap: wrap; }
  .cta-group .btn { flex: 1 1 48%; justify-content: center; }
}
@media (max-width: 480px) {
  .brand { font-size: 20px; }
  .brand .tag { display: none; }
  .cta-group .btn { flex: 1 1 100%; }
}

/* Hero */
.hero {
  position: relative;
  min-height: 580px;
  display: flex;
  align-items: center;
  overflow: hidden;
  isolation: isolate;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  z-index: -2;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(100deg, rgba(15,28,63,0.82) 0%, rgba(15,28,63,0.42) 55%, rgba(234,88,12,0.22) 100%);
  z-index: -1;
}
.hero-content {
  position: relative;
  max-width: 760px;
  padding: 90px 24px;
  z-index: 1;
  color: #ffffff;
}
.hero-content .eyebrow {
  display: inline-block;
  font-family: var(--ff-sans);
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--color-accent);
  margin-bottom: 20px;
  padding: 6px 12px;
  background: rgba(234,88,12,0.14);
  border-radius: 999px;
}
.hero-content h1 { color: #ffffff; font-weight: 700; font-style: italic; margin-bottom: 20px; }
.hero-content .lede {
  font-family: var(--ff-sans);
  font-size: 18px;
  line-height: 1.65;
  color: rgba(255,255,255,0.92);
  margin-bottom: 28px;
  max-width: 620px;
}

/* Sections */
.section { padding: 72px 0; }
.section h2.section-title { text-align: center; margin-bottom: 10px; }
.section .section-sub { text-align: center; color: var(--color-text-muted); max-width: 640px; margin: 0 auto 36px; font-size: 16px; }

/* Category panels */
.cat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
@media (max-width: 900px) { .cat-grid { grid-template-columns: repeat(2, 1fr); } }
.cat-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 2px solid var(--color-accent-2);
  border-radius: var(--radius-md);
  padding: 22px 20px 18px;
  text-decoration: none;
  color: var(--color-text);
  position: relative;
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}
.cat-card:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-md);
  border-left-color: var(--color-accent);
}
.cat-card .sig {
  font-family: var(--ff-sans);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--color-accent);
  margin-bottom: 14px;
  display: block;
}
.cat-card .emoji-strip {
  background: var(--color-accent-3);
  padding: 18px 0;
  border-radius: var(--radius-sm);
  text-align: center;
  font-size: 44px;
  line-height: 1;
  margin-bottom: 14px;
}
.cat-card .cat-name {
  font-family: var(--ff-serif);
  font-size: 18px;
  font-weight: 700;
  color: var(--color-accent-2);
  margin-bottom: 10px;
}
.cat-card .tune {
  font-family: var(--ff-sans);
  font-size: 13px;
  font-weight: 600;
  color: var(--color-accent);
  text-align: right;
}

/* Article dispatches */
.article-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
@media (max-width: 960px) { .article-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .article-grid { grid-template-columns: 1fr; } }

.article-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 6px solid var(--color-accent);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 22px 22px 20px;
  text-decoration: none;
  color: var(--color-text);
  position: relative;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.article-card::before {
  content: "";
  position: absolute;
  top: 18px;
  left: -4px;
  width: 10px;
  height: 10px;
  background: var(--color-accent-2);
}
.article-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}
.article-card .dispatch-tag {
  font-family: var(--ff-sans);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  color: var(--color-accent);
  display: block;
  margin-bottom: 10px;
  margin-top: 6px;
}
.article-card .article-title {
  font-family: var(--ff-serif);
  font-size: 20px;
  font-weight: 700;
  font-style: italic;
  color: var(--color-text);
  margin-bottom: 10px;
  line-height: 1.3;
}
.article-card .article-excerpt {
  font-size: 14.5px;
  color: var(--color-text-muted);
  margin-bottom: 14px;
  line-height: 1.6;
}
.article-card .read-dispatch {
  font-family: var(--ff-sans);
  font-size: 13px;
  font-weight: 600;
  color: var(--color-accent-2);
}

/* Homepage article content */
.home-article {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 48px clamp(24px, 4vw, 60px);
  max-width: 920px;
  margin: 0 auto;
}
.home-article h1 { margin-top: 0; font-size: clamp(28px, 3.6vw, 42px); }
.home-article p a, .home-article li a { color: var(--color-accent); font-weight: 600; }

/* CTA strip */
.cta-strip {
  background: var(--color-accent-2);
  color: #ffffff;
  padding: 60px 24px;
  text-align: center;
}
.cta-strip .eyebrow {
  font-family: var(--ff-sans);
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  color: var(--color-accent);
  margin-bottom: 10px;
  display: inline-block;
}
.cta-strip h2 {
  color: #ffffff;
  font-style: italic;
  font-size: clamp(28px, 4vw, 42px);
  margin-bottom: 24px;
}
.cta-strip .cta-group { justify-content: center; }

/* Guide article page */
.guide-title-band {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 48px 24px 36px;
  text-align: center;
}
.guide-title-band .eyebrow {
  font-family: var(--ff-sans);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  color: var(--color-accent);
  margin-bottom: 14px;
}
.guide-title-band h1 { margin: 0 auto 18px; max-width: 760px; }
.guide-title-band .rule {
  width: 60px;
  height: 3px;
  background: var(--color-accent-2);
  margin: 0 auto;
}
.breadcrumb {
  font-family: var(--ff-sans);
  font-size: 13px;
  color: var(--color-text-muted);
  padding: 16px 0;
  max-width: 1200px;
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}
.breadcrumb a { color: var(--color-text-muted); }
.breadcrumb a:hover { color: var(--color-accent); }

.guide-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 48px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 48px 24px;
}
@media (max-width: 900px) {
  .guide-layout { grid-template-columns: 1fr; }
}
.guide-main h2, .guide-main h3 { color: var(--color-accent-2); }
.guide-main a { color: var(--color-accent); font-weight: 600; }

.sidebar-box {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 20px;
}
.sidebar-box h3 {
  font-family: var(--ff-sans);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--color-accent);
  margin: 0 0 14px;
}
.sidebar-box ul { list-style: none; padding: 0; margin: 0; }
.sidebar-box li { margin-bottom: 8px; }
.sidebar-box a {
  color: var(--color-text);
  font-size: 14px;
  text-decoration: none;
}
.sidebar-box a:hover { color: var(--color-accent); }
.sidebar-cta { background: var(--color-accent-2); color: #ffffff; border-color: var(--color-accent-2); }
.sidebar-cta h3 { color: var(--color-accent-3); }
.sidebar-cta p { color: rgba(255,255,255,0.86); font-size: 14px; margin-bottom: 14px; }
.sidebar-cta .cta-group { display: flex; flex-direction: column; gap: 8px; }
.sidebar-cta .btn { width: 100%; }

.related-section {
  background: var(--color-bg);
  padding: 48px 24px;
  border-top: 1px solid var(--color-border);
}
.related-section h2 { text-align: center; margin-bottom: 30px; font-size: 24px; }
.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  max-width: 1100px;
  margin: 0 auto;
}
@media (max-width: 800px) { .related-grid { grid-template-columns: 1fr; } }

/* Footer */
.site-footer {
  background: var(--color-accent-2);
  color: var(--color-bg);
  padding: 56px 0 24px;
  margin-top: 72px;
}
.footer-cols {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 32px;
}
@media (max-width: 800px) { .footer-cols { grid-template-columns: 1fr; gap: 24px; } }
.site-footer h4 {
  color: var(--color-accent);
  font-family: var(--ff-sans);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  margin: 0 0 16px;
}
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin-bottom: 8px; }
.site-footer a { color: rgba(255,255,255,0.86); font-size: 14px; }
.site-footer a:hover { color: var(--color-accent); }
.site-footer .brand-block { font-family: var(--ff-serif); font-size: 20px; font-weight: 700; font-style: italic; color: #ffffff; margin-bottom: 12px; }
.site-footer .brand-block p { color: rgba(255,255,255,0.75); font-size: 14px; font-family: var(--ff-sans); font-style: normal; font-weight: 400; margin: 8px 0 16px; }
.site-footer .cta-group { gap: 8px; flex-wrap: wrap; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.14);
  padding-top: 20px;
  font-size: 13px;
  color: rgba(255,255,255,0.6);
  text-align: center;
}
.footer-bottom a { color: var(--color-accent); }

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
  html { scroll-behavior: auto; }
}