/* ==========================================================================
   CippyLearn - Frontend Stylesheet
   A dark, tool/download-hub aesthetic with a neon-mint accent.
   ========================================================================== */

:root {
  --bg: #0e1116;
  --bg-alt: #151a21;
  --card: #171d26;
  --card-hover: #1d2530;
  --border: #262e3a;
  --text: #e7ebf1;
  --text-muted: #93a0b4;
  --accent: #33e0a1;
  --accent-dark: #1fae7d;
  --accent-soft: rgba(51, 224, 161, 0.12);
  --danger: #ff6b6b;
  --radius: 14px;
  --shadow: 0 8px 24px rgba(0,0,0,0.35);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul { list-style: none; margin: 0; padding: 0; }

.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------- Header ---------- */
.site-header {
  background: rgba(14,17,22,0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 20px;
  letter-spacing: -0.02em;
}

.logo-mark {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #0b1410;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

.main-nav > a {
  color: var(--text-muted);
  font-weight: 600;
  font-size: 14.5px;
  transition: color .15s;
}
.main-nav > a:hover { color: var(--accent); }

.nav-search {
  display: flex;
  align-items: center;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 6px 6px 6px 14px;
}
.nav-search input {
  background: transparent;
  border: none;
  outline: none;
  color: var(--text);
  font-size: 13.5px;
  width: 180px;
}
.nav-search button {
  background: var(--accent-soft);
  border: none;
  color: var(--accent);
  border-radius: 7px;
  padding: 6px 8px;
  cursor: pointer;
  display: flex;
}

.lang-switch {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text-muted);
}
.lang-switch a { padding: 4px 8px; border-radius: 6px; font-weight: 700; }
.lang-switch a.active { background: var(--accent-soft); color: var(--accent); }
.lang-switch span { color: var(--border); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
}
.nav-toggle span { width: 22px; height: 2px; background: var(--text); border-radius: 2px; }

/* ---------- Hero ---------- */
.hero {
  padding: 64px 0 44px;
  text-align: center;
  background:
    radial-gradient(circle at 20% 20%, rgba(51,224,161,0.10), transparent 40%),
    radial-gradient(circle at 80% 0%, rgba(51,224,161,0.06), transparent 45%);
  border-bottom: 1px solid var(--border);
}
.hero h1 {
  font-size: 38px;
  margin: 0 0 14px;
  letter-spacing: -0.02em;
  background: linear-gradient(90deg, #fff, var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero p { color: var(--text-muted); font-size: 16px; max-width: 560px; margin: 0 auto; }

/* ---------- Layout ---------- */
.layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 40px;
  padding: 48px 20px 64px;
}
.section-title {
  font-size: 22px;
  margin: 0 0 24px;
  padding-left: 14px;
  border-left: 4px solid var(--accent);
}

/* ---------- Post grid & cards ---------- */
.post-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 22px;
}
.post-grid-small { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); }

.post-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform .18s, border-color .18s, box-shadow .18s;
}
.post-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-dark);
  box-shadow: var(--shadow);
}
.post-thumb { position: relative; display: block; aspect-ratio: 16/10; background: var(--bg-alt); overflow: hidden; }
.post-thumb img { width: 100%; height: 100%; object-fit: cover; }
.post-badge {
  position: absolute; top: 10px; left: 10px;
  background: var(--accent); color: #06140f;
  font-size: 11px; font-weight: 800;
  padding: 4px 9px; border-radius: 999px;
  text-transform: uppercase; letter-spacing: .04em;
}
.post-body { padding: 16px 18px 20px; }
.post-body h3 { font-size: 16.5px; margin: 0 0 8px; line-height: 1.35; }
.post-body h3 a:hover { color: var(--accent); }
.post-body p { color: var(--text-muted); font-size: 13.5px; margin: 0 0 14px; }

.post-meta {
  display: flex; gap: 14px; flex-wrap: wrap;
  font-size: 12.5px; color: var(--text-muted);
  margin: 10px 0 16px;
}

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 8px; font-weight: 700; font-size: 13.5px;
  padding: 10px 18px; border-radius: 10px;
  border: none; cursor: pointer; transition: background .15s, transform .1s;
}
.btn-download { background: var(--accent); color: #06140f; width: 100%; }
.btn-download:hover { background: var(--accent-dark); }
.btn-large { width: auto; padding: 14px 30px; font-size: 15px; }

/* ---------- Single post ---------- */
.breadcrumb { color: var(--text-muted); font-size: 13px; margin-bottom: 20px; }
.breadcrumb a:hover { color: var(--accent); }

.single-post h1 { font-size: 30px; line-height: 1.3; margin: 0 0 14px; }
.post-thumb-full {
  border-radius: var(--radius); overflow: hidden; border: 1px solid var(--border);
  margin: 20px 0;
}

.download-box {
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 16px;
  background: linear-gradient(135deg, var(--accent-soft), transparent);
  border: 1px solid var(--accent-dark);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin: 24px 0;
}
.download-info { display: flex; gap: 20px; flex-wrap: wrap; font-size: 13.5px; color: var(--text-muted); }
.download-box-bottom { justify-content: center; }

.post-content { font-size: 15.5px; color: #d3dae4; }
.post-content h2 { font-size: 21px; margin: 32px 0 12px; color: var(--text); }
.post-content h3 { font-size: 18px; margin: 24px 0 10px; }
.post-content p { margin: 0 0 16px; }
.post-content ul, .post-content ol { margin: 0 0 16px; padding-left: 22px; }
.post-content li { margin-bottom: 6px; }
.post-content code { background: var(--bg-alt); padding: 2px 6px; border-radius: 5px; font-size: 13px; }
.post-content img { border-radius: 10px; margin: 16px 0; }

.related-posts { margin-top: 56px; }

/* ---------- Sidebar ---------- */
.sidebar { display: flex; flex-direction: column; gap: 26px; }
.widget {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px;
}
.widget-title { font-size: 15px; margin: 0 0 16px; }
.widget-list li { margin-bottom: 12px; }
.widget-list a { display: flex; gap: 10px; align-items: center; }
.widget-list img { width: 52px; height: 52px; border-radius: 8px; object-fit: cover; flex-shrink: 0; }
.widget-list span { font-size: 13px; line-height: 1.35; }
.widget-list a:hover span { color: var(--accent); }

.tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
.tag {
  background: var(--bg-alt); border: 1px solid var(--border);
  padding: 6px 12px; border-radius: 999px; font-size: 12.5px; color: var(--text-muted);
}
.tag:hover { color: var(--accent); border-color: var(--accent-dark); }

/* ---------- Ad slots ---------- */
.ad-slot {
  border: 1px dashed var(--border);
  border-radius: 10px;
  padding: 14px;
  margin: 20px 0;
  text-align: center;
  background: var(--bg-alt);
}
.ad-label {
  display: block; font-size: 10.5px; letter-spacing: .1em;
  text-transform: uppercase; color: var(--text-muted); margin-bottom: 8px;
}
.ad-header { border-radius: 0; border-left: none; border-right: none; margin: 0; }
.ad-inline { grid-column: 1 / -1; }

/* ---------- Report broken link ---------- */
.report-block { margin-top: 30px; }
.report-details {
  border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--card); padding: 4px 0;
}
.report-details summary {
  cursor: pointer; padding: 14px 18px; font-size: 13.5px; font-weight: 600;
  color: var(--text-muted); list-style: none;
}
.report-details summary::-webkit-details-marker { display: none; }
.report-details summary:hover { color: var(--accent); }
.report-details[open] summary { border-bottom: 1px solid var(--border); color: var(--text); }
.report-form { padding: 18px; }
.report-form .form-group { margin-bottom: 14px; }
.report-form label { display: block; font-size: 12.5px; font-weight: 600; margin-bottom: 6px; color: var(--text); }
.report-form select, .report-form input, .report-form textarea {
  width: 100%; background: var(--bg-alt); border: 1px solid var(--border); color: var(--text);
  padding: 9px 12px; border-radius: 8px; font-size: 13.5px; font-family: inherit; outline: none;
}
.report-form select:focus, .report-form input:focus, .report-form textarea:focus { border-color: var(--accent); }
.report-form textarea { resize: vertical; }
.honeypot { position: absolute !important; left: -9999px !important; width: 1px; height: 1px; opacity: 0; }
.btn-secondary { background: var(--bg-alt); color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { border-color: var(--accent-dark); }

/* ---------- Dark / Light theme toggle ---------- */
.theme-toggle {
  background: var(--bg-alt); border: 1px solid var(--border); border-radius: 8px;
  width: 34px; height: 34px; display: flex; align-items: center; justify-content: center;
  cursor: pointer; color: var(--text-muted); flex-shrink: 0;
}
.theme-toggle:hover { color: var(--accent); border-color: var(--accent-dark); }
.theme-toggle svg { width: 17px; height: 17px; }
.theme-toggle .icon-sun { display: none; }
[data-theme="light"] .theme-toggle .icon-moon { display: none; }
[data-theme="light"] .theme-toggle .icon-sun { display: block; }

/* ---------- Light theme palette ---------- */
[data-theme="light"] {
  --bg: #f5f7fa;
  --bg-alt: #ffffff;
  --card: #ffffff;
  --card-hover: #f0f3f7;
  --border: #e2e8f0;
  --text: #1a2230;
  --text-muted: #64748b;
  --accent: #17b47f;
  --accent-dark: #129768;
  --accent-soft: rgba(23, 180, 127, 0.10);
}
[data-theme="light"] .site-header { background: rgba(255,255,255,0.92); }
[data-theme="light"] .hero {
  background:
    radial-gradient(circle at 20% 20%, rgba(23,180,127,0.08), transparent 40%),
    radial-gradient(circle at 80% 0%, rgba(23,180,127,0.05), transparent 45%);
}
[data-theme="light"] .hero h1 {
  background: linear-gradient(90deg, #1a2230, var(--accent));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
[data-theme="light"] .post-badge { color: #06140f; }
[data-theme="light"] .not-found h1 { color: var(--accent); }

/* ---------- Footer ---------- */
.site-footer { background: var(--bg-alt); border-top: 1px solid var(--border); margin-top: 40px; }
.footer-inner {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 32px;
  padding: 48px 20px;
}
.footer-col h4 { font-size: 14px; margin: 0 0 14px; color: var(--text); }
.footer-col p { color: var(--text-muted); font-size: 13.5px; }
.footer-links li { margin-bottom: 8px; }
.footer-links a { color: var(--text-muted); font-size: 13.5px; }
.footer-links a:hover { color: var(--accent); }
.footer-col .lang-switch { flex-direction: column; align-items: flex-start; gap: 8px; }

.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 18px 20px;
  text-align: center;
  font-size: 12.5px;
  color: var(--text-muted);
}

/* ---------- 404 ---------- */
.not-found { text-align: center; padding: 100px 0; }
.not-found h1 { font-size: 90px; margin: 0; color: var(--accent); }

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .layout { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 720px) {
  .main-nav {
    position: fixed; top: 68px; left: 0; right: 0; bottom: 0;
    background: var(--bg); flex-direction: column; align-items: flex-start;
    padding: 24px 20px; gap: 18px; transform: translateX(100%);
    transition: transform .25s; z-index: 90;
  }
  .main-nav.open { transform: translateX(0); }
  .nav-search { width: 100%; }
  .nav-search input { width: 100%; }
  .nav-toggle { display: flex; }
  .hero h1 { font-size: 28px; }
  .footer-inner { grid-template-columns: 1fr; }
}