/*
Theme Name: usfans Source
Theme URI: https://sheetcn.com/
Author: usfans Source Team
Description: A bold, modern SEO WordPress theme for the usfans Source shopping guide. Deep slate and electric lime palette with full-bleed hero.
Version: 1.0.0
Requires at least: 5.8
Requires PHP: 7.4
License: GPLv2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: usfans-source
Tags: blog, e-commerce, custom-menu, custom-logo, featured-images, full-width-template, responsive-layout, seo-friendly
*/

/* ============================================================
   DESIGN TOKENS
   ============================================================ */
:root {
  --color-bg: #f2f4f7;
  --color-surface: #ffffff;
  --color-accent: #1e293b;
  --color-accent-dark: #0f172a;
  --color-accent-2: #84cc16;
  --color-accent-2-dark: #65a30d;
  --color-text: #0f172a;
  --color-text-muted: #64748b;
  --color-border: #e2e8f0;
  --color-lime-faint: rgba(132,204,22,0.08);
  --color-lime-soft: rgba(132,204,22,0.18);

  --sp-1: 4px; --sp-2: 8px; --sp-3: 12px; --sp-4: 16px;
  --sp-6: 24px; --sp-8: 32px; --sp-12: 48px; --sp-16: 64px; --sp-24: 96px;

  --r-sm: 4px; --r-md: 8px; --r-lg: 16px; --r-pill: 9999px;
  --transition: 0.15s ease;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.10);

  --font-sans: 'Outfit', system-ui, sans-serif;
  --font-display: 'Syne', system-ui, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0c1220;
    --color-surface: #1e293b;
    --color-accent: #334155;
    --color-accent-dark: #1e293b;
    --color-accent-2: #bef264;
    --color-accent-2-dark: #a3e635;
    --color-text: #f1f5f9;
    --color-text-muted: #94a3b8;
    --color-border: #334155;
    --color-lime-faint: rgba(190,242,100,0.07);
    --color-lime-soft: rgba(190,242,100,0.14);
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
}

/* ============================================================
   RESET & BASE
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-accent-2); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-accent-2-dark); }
a:focus-visible { outline: 2px solid var(--color-accent-2); outline-offset: 3px; border-radius: 2px; }
h1,h2,h3,h4,h5 { font-family: var(--font-display); font-weight: 800; line-height: 1.2; }

/* ============================================================
   LAYOUT
   ============================================================ */
.container { max-width: 1160px; margin: 0 auto; padding: 0 var(--sp-6); }
.section { padding: var(--sp-16) 0; }
.section--tight { padding: var(--sp-12) 0; }

/* ============================================================
   ANNOUNCEMENT BAR
   ============================================================ */
.announce-bar {
  background: var(--color-accent-2);
  color: var(--color-accent-dark);
  text-align: center;
  padding: var(--sp-2) var(--sp-4);
  font-size: 0.85rem;
  font-weight: 600;
  font-family: var(--font-sans);
}

/* ============================================================
   NAV (dark slate)
   ============================================================ */
.site-header {
  background: var(--color-accent-dark);
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 2px solid var(--color-accent-2);
}
.header-inner {
  display: flex;
  align-items: center;
  gap: var(--sp-6);
  height: 64px;
}
.site-brand {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.25rem;
  color: #fff;
  white-space: nowrap;
  flex-shrink: 0;
}
.site-brand:hover { color: var(--color-accent-2); }
.site-nav { display: flex; align-items: center; gap: var(--sp-1); flex: 1; }
.site-nav a {
  color: rgba(255,255,255,0.8);
  font-weight: 500;
  padding: var(--sp-2) var(--sp-3);
  border-radius: var(--r-md);
  font-size: 0.95rem;
  transition: color var(--transition), background var(--transition);
}
.site-nav a:hover, .site-nav a.active {
  color: var(--color-accent-2);
  background: rgba(255,255,255,0.06);
}
.nav-dropdown { position: relative; }
.nav-dropdown > a::after { content: ' ▾'; font-size: 0.7em; }
.dropdown-menu {
  display: none;
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--r-md);
  min-width: 240px;
  box-shadow: var(--shadow-md);
  z-index: 200;
  padding: var(--sp-2) 0;
}
.dropdown-menu a {
  display: block;
  padding: var(--sp-2) var(--sp-4);
  color: var(--color-text);
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: 0;
}
.dropdown-menu a:hover { background: var(--color-lime-faint); color: var(--color-accent-2-dark); }
.nav-dropdown:hover .dropdown-menu,
.nav-dropdown:focus-within .dropdown-menu { display: block; }
.header-ctas { display: flex; gap: var(--sp-2); margin-left: auto; }
.btn { display: inline-flex; align-items: center; gap: var(--sp-2); padding: var(--sp-2) var(--sp-4); border-radius: var(--r-pill); font-weight: 700; font-size: 0.9rem; font-family: var(--font-sans); cursor: pointer; transition: background var(--transition), color var(--transition), transform var(--transition); border: 2px solid transparent; white-space: nowrap; }
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--color-accent-2); color: var(--color-accent-dark); border-color: var(--color-accent-2); }
.btn-primary:hover { background: var(--color-accent-2-dark); border-color: var(--color-accent-2-dark); color: var(--color-accent-dark); }
.btn-secondary { background: transparent; color: #fff; border-color: rgba(255,255,255,0.4); }
.btn-secondary:hover { background: rgba(255,255,255,0.1); color: #fff; border-color: #fff; }
.hamburger { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: var(--sp-2); }
.hamburger span { display: block; width: 22px; height: 2px; background: #fff; border-radius: 2px; transition: var(--transition); }
#nav-toggle { display: none; }
@media (max-width: 768px) {
  .hamburger { display: flex; margin-left: auto; }
  .site-nav, .header-ctas { display: none; }
  #nav-toggle:checked ~ .site-header .site-nav { display: flex; flex-direction: column; position: absolute; top: 64px; left: 0; right: 0; background: var(--color-accent-dark); padding: var(--sp-4); z-index: 99; }
  #nav-toggle:checked ~ .site-header .header-ctas { display: flex; position: absolute; top: 120px; left: 0; right: 0; padding: 0 var(--sp-4) var(--sp-4); background: var(--color-accent-dark); z-index: 99; }
  .dropdown-menu { position: static; box-shadow: none; border: none; background: rgba(255,255,255,0.05); }
}

/* ============================================================
   HERO — full-bleed with bottom-band gradient
   ============================================================ */
.site-hero {
  position: relative;
  min-height: 560px;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('https://images.unsplash.com/photo-1469334031218-e382a71b716b?w=1600');
  background-size: cover;
  background-position: center top;
  z-index: 0;
}
.hero-gradient {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, transparent 30%, rgba(15,23,42,0.6) 60%, rgba(15,23,42,0.97) 100%);
  z-index: 1;
}
.hero-content {
  position: relative;
  z-index: 2;
  width: 100%;
  padding: var(--sp-16) 0 var(--sp-12);
  text-align: center;
}
.hero-content h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  color: #fff;
  margin-bottom: var(--sp-4);
  text-shadow: 0 2px 12px rgba(0,0,0,0.4);
}
.hero-content .hero-lede {
  font-size: 1.1rem;
  color: rgba(255,255,255,0.82);
  max-width: 600px;
  margin: 0 auto var(--sp-8);
}
.hero-btns { display: flex; gap: var(--sp-3); justify-content: center; flex-wrap: wrap; }

/* ============================================================
   SECTION HEADINGS
   ============================================================ */
.section-heading {
  text-align: center;
  margin-bottom: var(--sp-8);
}
.section-heading h2 { font-size: clamp(1.5rem, 3vw, 2rem); color: var(--color-text); }
.section-heading p { color: var(--color-text-muted); margin-top: var(--sp-2); }

/* ============================================================
   CATEGORY TILES (watermark number style)
   ============================================================ */
.category-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--sp-4);
}
.category-tile {
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--r-lg);
  padding: var(--sp-8) var(--sp-4) var(--sp-6);
  text-align: center;
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-2);
  text-decoration: none;
  color: var(--color-text);
}
.category-tile:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); color: var(--color-text); }
.category-tile .tile-number {
  position: absolute;
  top: -8px;
  right: 8px;
  font-family: var(--font-display);
  font-size: 5rem;
  font-weight: 800;
  color: var(--color-accent-2);
  opacity: 0.12;
  line-height: 1;
  pointer-events: none;
  user-select: none;
}
.category-tile .tile-emoji { font-size: 2.5rem; position: relative; z-index: 1; }
.category-tile .tile-name { font-family: var(--font-display); font-weight: 800; font-size: 0.95rem; position: relative; z-index: 1; }
@media (max-width: 900px) { .category-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px) { .category-grid { grid-template-columns: 1fr 1fr; } }

/* ============================================================
   ARTICLE LIST ROWS (horizontal)
   ============================================================ */
.article-list { display: flex; flex-direction: column; }
.article-row {
  display: flex;
  align-items: center;
  gap: var(--sp-6);
  padding: var(--sp-6) 0;
  border-bottom: 2px solid var(--color-accent-2);
  text-decoration: none;
  color: var(--color-text);
  transition: background var(--transition);
}
.article-row:first-child { border-top: 2px solid var(--color-accent-2); }
.article-row:hover { background: var(--color-lime-faint); }
.article-row .row-num {
  flex-shrink: 0;
  width: 52px;
  height: 52px;
  border-radius: var(--r-md);
  background: var(--color-accent-dark);
  color: var(--color-accent-2);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
}
.article-row .row-body { flex: 1; }
.article-row .row-title { font-family: var(--font-display); font-weight: 800; font-size: 1.05rem; margin-bottom: var(--sp-1); }
.article-row .row-excerpt { font-size: 0.88rem; color: var(--color-text-muted); }
.article-row .row-link { flex-shrink: 0; font-size: 0.85rem; font-weight: 700; color: var(--color-accent-2); white-space: nowrap; }
@media (max-width: 600px) {
  .article-row { flex-wrap: wrap; }
  .article-row .row-link { width: 100%; text-align: right; }
}

/* ============================================================
   HOMEPAGE ARTICLE
   ============================================================ */
.home-article { max-width: 860px; margin: 0 auto; }
.home-article h1 { font-size: clamp(1.6rem, 3.5vw, 2.2rem); margin-bottom: var(--sp-6); }
.home-article h2 { font-size: 1.35rem; margin: var(--sp-8) 0 var(--sp-3); color: var(--color-text); }
.home-article h3 { font-size: 1.1rem; margin: var(--sp-6) 0 var(--sp-2); }
.home-article p { margin-bottom: var(--sp-4); color: var(--color-text); }
.home-article ul { margin: var(--sp-3) 0 var(--sp-4) var(--sp-6); }
.home-article ul li { margin-bottom: var(--sp-2); }
.home-article blockquote { border-left: 4px solid var(--color-accent-2); padding: var(--sp-4) var(--sp-6); background: var(--color-lime-faint); border-radius: 0 var(--r-md) var(--r-md) 0; margin: var(--sp-6) 0; font-style: italic; color: var(--color-text-muted); }
.home-article a { color: var(--color-accent-2); text-decoration: underline; }

/* ============================================================
   CTA STRIP
   ============================================================ */
.cta-strip {
  background: var(--color-accent-2);
  padding: var(--sp-16) 0;
  text-align: center;
}
.cta-strip .cta-eyebrow { font-size: 0.8rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--color-accent-dark); margin-bottom: var(--sp-3); }
.cta-strip h2 { font-family: var(--font-display); font-size: clamp(1.4rem, 3vw, 2rem); color: var(--color-accent-dark); margin-bottom: var(--sp-6); }
.cta-strip .btn-primary { background: var(--color-accent-dark); color: #fff; border-color: var(--color-accent-dark); }
.cta-strip .btn-primary:hover { background: var(--color-accent); }
.cta-strip .btn-secondary { border-color: var(--color-accent-dark); color: var(--color-accent-dark); }
.cta-strip .btn-secondary:hover { background: rgba(0,0,0,0.08); }
.cta-btns { display: flex; gap: var(--sp-3); justify-content: center; flex-wrap: wrap; }

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  background: var(--color-accent-dark);
  color: rgba(255,255,255,0.75);
  padding: var(--sp-16) 0 var(--sp-8);
}
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr; gap: var(--sp-8); margin-bottom: var(--sp-12); }
.footer-col h3 { font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--color-accent-2); margin-bottom: var(--sp-4); font-family: var(--font-sans); font-weight: 700; }
.footer-col p { font-size: 0.9rem; line-height: 1.6; margin-bottom: var(--sp-4); }
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: var(--sp-2); }
.footer-col ul a { font-size: 0.9rem; color: rgba(255,255,255,0.7); }
.footer-col ul a:hover { color: var(--color-accent-2); }
.footer-brand { font-family: var(--font-display); font-size: 1.2rem; font-weight: 800; color: #fff; margin-bottom: var(--sp-3); }
.footer-btns { display: flex; flex-direction: column; gap: var(--sp-2); margin-top: var(--sp-4); }
.footer-btns .btn { justify-content: center; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding-top: var(--sp-6); text-align: center; font-size: 0.85rem; color: rgba(255,255,255,0.4); }
.footer-bottom a { color: var(--color-accent-2); }
@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr; }
}

/* ============================================================
   SINGLE / PAGE ARTICLE
   ============================================================ */
.entry-wrap { display: grid; grid-template-columns: 1fr 300px; gap: var(--sp-8); align-items: start; }
.entry-content h2 { font-size: 1.3rem; margin: var(--sp-8) 0 var(--sp-3); }
.entry-content h3 { font-size: 1.05rem; margin: var(--sp-6) 0 var(--sp-2); }
.entry-content p { margin-bottom: var(--sp-4); }
.entry-content ul { margin: var(--sp-3) 0 var(--sp-4) var(--sp-6); }
.entry-content ul li { margin-bottom: var(--sp-2); }
.entry-content blockquote { border-left: 4px solid var(--color-accent-2); padding: var(--sp-4) var(--sp-6); background: var(--color-lime-faint); border-radius: 0 var(--r-md) var(--r-md) 0; margin: var(--sp-6) 0; font-style: italic; }
.entry-content a { color: var(--color-accent-2); text-decoration: underline; }
.sidebar-box { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--r-lg); padding: var(--sp-6); margin-bottom: var(--sp-4); }
.sidebar-box h3 { font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--color-text-muted); margin-bottom: var(--sp-4); font-family: var(--font-sans); }
.sidebar-box ul { list-style: none; }
.sidebar-box ul li { margin-bottom: var(--sp-2); border-bottom: 1px solid var(--color-border); padding-bottom: var(--sp-2); }
.sidebar-box ul li:last-child { border-bottom: none; }
.sidebar-box ul a { font-size: 0.9rem; font-weight: 500; }
.breadcrumb { font-size: 0.85rem; color: var(--color-text-muted); margin-bottom: var(--sp-6); }
.breadcrumb a { color: var(--color-text-muted); }
.breadcrumb a:hover { color: var(--color-accent-2); }
.entry-title-band { text-align: center; padding: var(--sp-12) 0 var(--sp-8); border-bottom: 3px solid var(--color-accent-2); margin-bottom: var(--sp-8); }
.entry-eyebrow { font-size: 0.8rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--color-accent-2); margin-bottom: var(--sp-3); }
.entry-title-band h1 { font-size: clamp(1.5rem, 3.5vw, 2.2rem); }
.related-guides { margin-top: var(--sp-12); }
.related-guides h2 { font-size: 1.1rem; margin-bottom: var(--sp-4); }
.related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--sp-4); }
.related-card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--r-md); padding: var(--sp-4); }
.related-card a { font-weight: 600; font-size: 0.9rem; }
@media (max-width: 900px) {
  .entry-wrap { grid-template-columns: 1fr; }
  .related-grid { grid-template-columns: 1fr; }
}