/* ============================================================
   FILCE.UK — Main Stylesheet
   Clean, minimal, mobile-first, dark mode supported
   ============================================================ */

/* --- Custom Properties --- */
:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f8f8f6;
  --color-surface: #f0efeb;
  --color-border: #e5e3dc;
  --color-text: #1a1a18;
  --color-text-muted: #6b6b62;
  --color-text-faint: #9a9a90;
  --color-accent: #1a6b3c;
  --color-accent-hover: #14542f;
  --color-accent-light: #e8f5ee;
  --color-tag-bg: #eef7f2;
  --color-tag-text: #1a6b3c;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Cascadia Code", Consolas, monospace;

  --size-xs: 0.75rem;
  --size-sm: 0.875rem;
  --size-base: 1rem;
  --size-lg: 1.125rem;
  --size-xl: 1.25rem;
  --size-2xl: 1.5rem;
  --size-3xl: 1.875rem;
  --size-4xl: 2.25rem;

  --radius-sm: 4px;
  --radius: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow: 0 4px 12px rgba(0,0,0,.08);
  --shadow-lg: 0 8px 30px rgba(0,0,0,.12);

  --container-max: 1100px;
  --container-prose: 720px;
  --gap: 1.5rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #111110;
    --color-bg-alt: #161615;
    --color-surface: #1e1e1c;
    --color-border: #2a2a27;
    --color-text: #f0efe8;
    --color-text-muted: #9a9a90;
    --color-text-faint: #6b6b62;
    --color-accent: #3dd68c;
    --color-accent-hover: #5ee09f;
    --color-accent-light: #0d2b1c;
    --color-tag-bg: #0d2b1c;
    --color-tag-text: #3dd68c;
    --shadow-sm: 0 1px 3px rgba(0,0,0,.3);
    --shadow: 0 4px 12px rgba(0,0,0,.4);
    --shadow-lg: 0 8px 30px rgba(0,0,0,.5);
  }
}

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.65;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main { flex: 1; }

img, video { max-width: 100%; height: auto; display: block; }
a { color: var(--color-accent); text-decoration: none; }
a:hover { color: var(--color-accent-hover); text-decoration: underline; }
ul, ol { padding-left: 1.5rem; }

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 2px;
}

/* --- Container --- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: 1.25rem;
}

/* --- Header --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(8px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
  gap: 1rem;
}

.site-logo { text-decoration: none; }
.logo-text {
  font-size: var(--size-xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text);
}
.logo-dot { color: var(--color-accent); }
.site-logo:hover .logo-dot { color: var(--color-accent-hover); }

/* Nav */
.main-nav { display: flex; align-items: center; }
.nav-list {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
  padding: 0;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: var(--size-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  background: none;
  border: none;
  cursor: pointer;
  transition: color 0.15s, background 0.15s;
}
.nav-link:hover, .nav-link.active {
  color: var(--color-text);
  background: var(--color-surface);
  text-decoration: none;
}

/* Dropdown */
.nav-dropdown { position: relative; }
.dropdown-arrow { font-size: 0.7em; transition: transform 0.2s; }
.dropdown-toggle[aria-expanded="true"] .dropdown-arrow { transform: rotate(180deg); }

.dropdown-menu {
  display: none;
  position: absolute;
  top: calc(100% + 4px);
  right: 0;
  min-width: 220px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  list-style: none;
  padding: 0.5rem;
  z-index: 200;
}
.dropdown-menu.open { display: block; }
.dropdown-menu li a {
  display: block;
  padding: 0.45rem 0.75rem;
  font-size: var(--size-sm);
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: background 0.15s, color 0.15s;
}
.dropdown-menu li a:hover {
  background: var(--color-surface);
  color: var(--color-text);
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  border-radius: var(--radius-sm);
}
.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: 0.2s;
}
.nav-toggle:hover { background: var(--color-surface); }

@media (max-width: 680px) {
  .nav-toggle { display: flex; }
  .main-nav {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 1rem 1.25rem;
    box-shadow: var(--shadow);
  }
  .main-nav.open { display: block; }
  .nav-list { flex-direction: column; align-items: stretch; gap: 0.125rem; }
  .nav-link { width: 100%; }
  .dropdown-menu {
    position: static;
    box-shadow: none;
    border: 1px solid var(--color-border);
    margin-top: 0.25rem;
    border-radius: var(--radius-sm);
  }
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius);
  font-size: var(--size-sm);
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  border: none;
  transition: background 0.15s, color 0.15s, transform 0.1s;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary {
  background: var(--color-accent);
  color: #fff;
}
.btn-primary:hover {
  background: var(--color-accent-hover);
  color: #fff;
}
.btn-outline {
  background: transparent;
  color: var(--color-accent);
  border: 1.5px solid var(--color-accent);
}
.btn-outline:hover {
  background: var(--color-accent-light);
}

/* --- Hero --- */
.hero {
  padding: 4rem 0 3.5rem;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg-alt);
}
.hero-inner { max-width: 680px; }
.hero-eyebrow {
  font-size: var(--size-sm);
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.75rem;
}
.hero-title {
  font-size: clamp(var(--size-3xl), 5vw, var(--size-4xl));
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
}
.hero-desc {
  font-size: var(--size-lg);
  color: var(--color-text-muted);
  max-width: 560px;
  margin-bottom: 1.75rem;
}

/* --- Sections --- */
.posts-section, .categories-section {
  padding: 3.5rem 0;
}
.categories-section { border-top: 1px solid var(--color-border); background: var(--color-bg-alt); }

.section-header { margin-bottom: 2rem; }
.section-title {
  font-size: var(--size-2xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.35rem;
}
.section-sub { color: var(--color-text-muted); font-size: var(--size-sm); }

/* --- Post Grid --- */
.post-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

.post-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: box-shadow 0.2s, transform 0.2s;
  display: flex;
  flex-direction: column;
}
.post-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.post-card-image {
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--color-surface);
}
.post-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s;
}
.post-card:hover .post-card-image img { transform: scale(1.03); }

.post-card-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-border) 100%);
}
.post-card-placeholder span {
  font-size: var(--size-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-faint);
}

.post-card-body {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.post-category-tag {
  display: inline-block;
  font-size: var(--size-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-tag-text);
  background: var(--color-tag-bg);
  padding: 0.2rem 0.6rem;
  border-radius: 100px;
  margin-bottom: 0.6rem;
  text-decoration: none;
}
.post-category-tag:hover {
  background: var(--color-accent);
  color: #fff;
  text-decoration: none;
}

.post-card-title {
  font-size: var(--size-lg);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
  margin-bottom: 0.5rem;
}
.post-card-title a {
  color: var(--color-text);
  text-decoration: none;
}
.post-card-title a:hover { color: var(--color-accent); }

.post-card-excerpt {
  font-size: var(--size-sm);
  color: var(--color-text-muted);
  line-height: 1.55;
  flex: 1;
  margin-bottom: 1rem;
}

.post-card-meta {
  font-size: var(--size-xs);
  color: var(--color-text-faint);
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-top: auto;
}
.meta-sep { opacity: 0.5; }

/* --- Category Grid --- */
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 1rem;
}
.category-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding: 1.25rem 1rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  transition: box-shadow 0.2s, transform 0.2s, border-color 0.2s;
}
.category-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-sm);
  transform: translateY(-2px);
  text-decoration: none;
}
.category-icon { font-size: 1.75rem; line-height: 1; }
.category-name {
  font-size: var(--size-xs);
  font-weight: 600;
  color: var(--color-text);
  text-align: center;
  line-height: 1.3;
}

/* --- Post Full --- */
.post-full { padding: 2.5rem 0 4rem; }
.post-container { max-width: var(--container-prose); }

.post-header { margin-bottom: 1.75rem; }
.post-title {
  font-size: clamp(var(--size-2xl), 4vw, var(--size-4xl));
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin: 0.5rem 0 0.75rem;
}
.post-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--size-sm);
  color: var(--color-text-muted);
}
.post-excerpt {
  font-size: var(--size-lg);
  color: var(--color-text-muted);
  line-height: 1.5;
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--color-border);
}

.post-hero {
  margin-bottom: 2rem;
  border-radius: var(--radius-xl);
  overflow: hidden;
}
.post-hero-image { width: 100%; aspect-ratio: 16/9; object-fit: cover; }
.post-hero-placeholder {
  aspect-ratio: 16/9;
  background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-border) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero-placeholder-inner { text-align: center; }
.hero-category-label {
  font-size: var(--size-sm);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-faint);
}

/* --- Prose / Post Content --- */
.prose {
  font-size: var(--size-lg);
  line-height: 1.75;
  color: var(--color-text);
}
.prose h2 {
  font-size: var(--size-2xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-top: 2.25rem;
  margin-bottom: 0.75rem;
}
.prose h3 {
  font-size: var(--size-xl);
  font-weight: 700;
  margin-top: 1.75rem;
  margin-bottom: 0.5rem;
}
.prose p { margin-bottom: 1.25rem; }
.prose ul, .prose ol { margin-bottom: 1.25rem; }
.prose li { margin-bottom: 0.35rem; }
.prose a { text-decoration: underline; text-underline-offset: 3px; }
.prose strong { font-weight: 700; }
.prose em { font-style: italic; }
.prose code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: 0.15em 0.4em;
  border-radius: 4px;
}
.prose pre {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem;
  overflow-x: auto;
  margin-bottom: 1.5rem;
}
.prose pre code { background: none; border: none; padding: 0; }
.prose blockquote {
  border-left: 3px solid var(--color-accent);
  padding-left: 1.25rem;
  color: var(--color-text-muted);
  margin: 1.5rem 0;
  font-style: italic;
}
.prose hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 2.5rem 0;
}
.prose img {
  border-radius: var(--radius);
  margin: 1.5rem 0;
}

/* --- Post Footer --- */
.post-footer { margin-top: 3rem; padding-top: 2rem; border-top: 1px solid var(--color-border); }
.post-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1.25rem; }
.tag {
  font-size: var(--size-xs);
  color: var(--color-text-muted);
  background: var(--color-surface);
  padding: 0.2rem 0.6rem;
  border-radius: 100px;
}
.post-affiliate-note {
  font-size: var(--size-sm);
  color: var(--color-text-muted);
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 0.875rem 1rem;
  margin-bottom: 1.5rem;
  line-height: 1.5;
}
.back-link {
  font-size: var(--size-sm);
  font-weight: 600;
  color: var(--color-accent);
}

/* --- About Page --- */
.about-page { padding: 3rem 0 5rem; }
.about-container { max-width: var(--container-prose); }
.page-header { margin-bottom: 2rem; }
.page-header h1 {
  font-size: var(--size-4xl);
  font-weight: 800;
  letter-spacing: -0.03em;
}
.about-lead {
  font-size: var(--size-xl);
  line-height: 1.6;
  color: var(--color-text);
  margin-bottom: 1.25rem;
}

/* --- Footer --- */
.site-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-alt);
  padding: 2.5rem 0;
  margin-top: auto;
}
.footer-inner { }
.footer-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 2rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}
.footer-tagline {
  font-size: var(--size-sm);
  color: var(--color-text-muted);
  margin-top: 0.35rem;
}
.footer-nav ul { list-style: none; padding: 0; display: flex; gap: 1.25rem; flex-wrap: wrap; }
.footer-nav a {
  font-size: var(--size-sm);
  color: var(--color-text-muted);
  text-decoration: none;
}
.footer-nav a:hover { color: var(--color-text); }

.footer-bottom { border-top: 1px solid var(--color-border); padding-top: 1.5rem; }
.affiliate-disclosure {
  font-size: var(--size-xs);
  color: var(--color-text-muted);
  line-height: 1.55;
  margin-bottom: 0.5rem;
  max-width: 680px;
}
.copyright { font-size: var(--size-xs); color: var(--color-text-faint); }

/* --- Utility --- */
.empty-state {
  color: var(--color-text-muted);
  font-size: var(--size-lg);
  padding: 3rem 0;
}
.reading-time { }

/* --- Responsive tweaks --- */
@media (max-width: 480px) {
  .post-grid { grid-template-columns: 1fr; }
  .category-grid { grid-template-columns: repeat(2, 1fr); }
  .hero { padding: 2.5rem 0 2rem; }
  .footer-top { flex-direction: column; gap: 1.25rem; }
}