/* ============================================================
   Bitcoin Suomi - Shared Stylesheet
   ============================================================ */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@400;500;600;700&family=Roboto+Slab:wght@400;600&display=swap');

/* CSS Variables */
:root {
  --color-primary: #6ec1e4;
  --color-secondary: #54595f;
  --color-text: #4a4a4a;
  --color-accent: #61ce70;
  --color-dark: #01567a;
  --color-bg: #f9f9f9;
  --color-white: #ffffff;
  --color-border: #e0e0e0;
  --max-width: 1140px;
  --font-main: 'Roboto', sans-serif;
  --font-slab: 'Roboto Slab', serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-main);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-white);
  margin: 0;
  padding: 0;
}

img { max-width: 100%; height: auto; display: block; }

a {
  color: var(--color-dark);
  text-decoration: none;
  transition: color 0.2s;
}
a:hover { color: var(--color-primary); text-decoration: underline; }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-main);
  font-weight: 600;
  color: #2c3e50;
  line-height: 1.3;
  margin-top: 1.5em;
  margin-bottom: 0.5em;
}

h1 { font-size: 2em; border-bottom: 2px solid var(--color-primary); padding-bottom: 10px; }
h2 { font-size: 1.6em; color: var(--color-dark); }
h3 { font-size: 1.25em; }
h4 { font-size: 1.05em; }

p { margin: 0 0 1em; }

ul, ol { margin: 0 0 1em; padding-left: 1.8em; }
li { margin-bottom: 0.4em; }

strong { color: #2c3e50; }

/* ============================================================
   HEADER / NAV
   ============================================================ */
.site-header {
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.site-logo img {
  height: 48px;
  width: auto;
}

.site-nav { display: flex; align-items: center; gap: 8px; }

.site-nav a {
  display: inline-block;
  padding: 8px 16px;
  border-radius: 6px;
  font-weight: 500;
  font-size: 0.95em;
  color: var(--color-secondary);
  transition: background 0.2s, color 0.2s;
}
.site-nav a:hover,
.site-nav a.active {
  background: var(--color-dark);
  color: var(--color-white);
  text-decoration: none;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  flex-direction: column;
  gap: 5px;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-secondary);
  transition: all 0.3s;
}

/* ============================================================
   PAGE WRAPPER
   ============================================================ */
.page-wrapper {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 30px 20px 60px;
}

/* ============================================================
   HOMEPAGE - WELCOME BOX
   ============================================================ */
.welcome-section {
  display: flex;
  gap: 30px;
  align-items: flex-start;
  margin-bottom: 40px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 30px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.welcome-logo {
  flex: 0 0 180px;
}
.welcome-logo img { width: 180px; }

.welcome-content { flex: 1; }

.welcome-content h3 {
  color: var(--color-dark);
  margin-top: 1.2em;
}

.welcome-content ul {
  list-style: disc;
}

/* Coinmotion banner */
.cm-banner {
  margin-top: 20px;
  text-align: center;
}
.cm-banner img {
  border-radius: 6px;
  max-width: 100%;
  display: inline-block;
}

/* ============================================================
   TOPIC CARDS GRID
   ============================================================ */
.topics-section {
  margin: 40px 0;
}

.topics-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.topic-card {
  position: relative;
  border-radius: 20px;
  overflow: hidden;
  min-height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-size: cover;
  background-position: center right;
  text-decoration: none;
  transition: transform 0.2s;
}
.topic-card:hover { transform: scale(1.03); text-decoration: none; }

.topic-card-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.75);
  border-radius: 20px;
}

.topic-card-title {
  position: relative;
  z-index: 1;
  color: #fff;
  font-family: var(--font-main);
  font-size: 1.1em;
  font-weight: 600;
  text-align: center;
  padding: 20px;
  margin: 0;
}

.topic-card.unavailable { display: none;
  cursor: default;
  pointer-events: none;
  filter: grayscale(30%);
}
.topic-card.unavailable:hover { transform: none; }

/* ============================================================
   FAQ / UKK SECTION
   ============================================================ */
.faq-section {
  max-width: 860px;
  margin: 40px auto;
}

.faq-section h2.section-title {
  color: var(--color-dark);
  font-size: 1.8em;
  border-bottom: 2px solid var(--color-dark);
  padding-bottom: 10px;
  margin-bottom: 8px;
}

.faq-update {
  font-style: italic;
  color: #888;
  font-size: 0.9em;
  margin-bottom: 24px;
}

#search-container {
  margin-bottom: 24px;
}

#search-input {
  width: 100%;
  padding: 12px 16px;
  font-size: 16px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-family: var(--font-main);
  outline: none;
  transition: border-color 0.2s;
}
#search-input:focus { border-color: var(--color-dark); }

.faq-item {
  border-bottom: 1px solid var(--color-border);
  padding: 16px 0;
}

.faq-question {
  font-size: 1.05em;
  font-weight: 600;
  color: var(--color-dark);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
  margin: 0;
  padding: 0;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
  font-family: var(--font-main);
}
.faq-question:hover { color: var(--color-primary); }

.faq-question::after {
  content: '+';
  font-size: 1.4em;
  font-weight: 400;
  color: var(--color-primary);
  margin-left: 12px;
  flex-shrink: 0;
  transition: transform 0.2s;
}
.faq-question.open::after { content: '−'; }

.faq-answer {
  overflow: hidden;
  max-height: 0;
  transition: max-height 0.35s ease, padding 0.2s;
  padding: 0;
}
.faq-answer.open {
  max-height: 2000px;
  padding-top: 12px;
}
.faq-answer p { margin-bottom: 0.8em; line-height: 1.8; }
.faq-answer ul, .faq-answer ol { margin-bottom: 0.8em; }

/* ============================================================
   ARTICLE PAGE LAYOUT
   ============================================================ */
.article-layout {
  display: flex;
  gap: 40px;
  align-items: flex-start;
}

.article-main {
  flex: 1;
  min-width: 0;
}

.article-sidebar {
  flex: 0 0 260px;
  position: sticky;
  top: 90px;
}

/* Article content styles */
.article-main h1 {
  font-size: 1.9em;
  color: var(--color-dark);
  border-bottom: 2px solid var(--color-primary);
  padding-bottom: 12px;
  margin-top: 0;
}

.article-main h2 {
  font-size: 1.45em;
  color: var(--color-dark);
  margin-top: 2em;
  padding-bottom: 6px;
  border-bottom: 1px solid #eee;
}

.article-main h3 {
  font-size: 1.15em;
  color: #2c3e50;
  margin-top: 1.5em;
}

.article-main h4 {
  font-size: 1em;
  color: #2c3e50;
  margin-top: 1.2em;
}

.article-main img {
  border-radius: 6px;
  margin: 16px 0;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

/* Table of Contents */
.toc-box {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 16px 20px;
  font-size: 0.9em;
}

.toc-box h3 {
  font-size: 1em;
  margin-top: 0;
  margin-bottom: 12px;
  color: var(--color-dark);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 8px;
}

.toc-box ol {
  margin: 0;
  padding-left: 1.4em;
}

.toc-box li { margin-bottom: 6px; }

.toc-box a {
  color: var(--color-secondary);
  font-size: 0.9em;
}
.toc-box a:hover { color: var(--color-dark); }

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  background: #1a2533;
  color: #aab4c0;
  padding: 40px 20px;
  margin-top: 60px;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 16px;
}

.footer-logo img { height: 40px; filter: brightness(0) invert(1); opacity: 0.7; }

.footer-nav { display: flex; gap: 20px; flex-wrap: wrap; justify-content: center; }
.footer-nav a { color: #aab4c0; font-size: 0.9em; }
.footer-nav a:hover { color: #fff; }

.footer-copy { font-size: 0.85em; color: #6b7785; }

/* ============================================================
   BREADCRUMBS
   ============================================================ */
.breadcrumb {
  font-size: 0.875em;
  color: #888;
  margin-bottom: 24px;
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border);
}
.breadcrumb a { color: var(--color-dark); }
.breadcrumb span { margin: 0 6px; color: #ccc; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  .topics-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .site-nav { display: none; flex-direction: column; position: absolute; top: 70px; left: 0; right: 0; background: #fff; border-top: 1px solid var(--color-border); padding: 12px 20px; gap: 4px; box-shadow: 0 4px 12px rgba(0,0,0,0.1); }
  .site-nav.open { display: flex; }
  .site-nav a { width: 100%; padding: 10px 12px; }
  .nav-toggle { display: flex; }

  .welcome-section { flex-direction: column; }
  .welcome-logo { flex: none; width: 100%; text-align: center; }
  .welcome-logo img { width: 120px; margin: 0 auto; }

  .topics-grid { grid-template-columns: 1fr; }

  .article-layout { flex-direction: column; }
  .article-sidebar { position: static; width: 100%; flex: none; order: -1; margin-bottom: 20px; }
  .article-sidebar .sidebar-ad { display: none; }

  h1 { font-size: 1.6em; }
  h2 { font-size: 1.3em; }
}

@media (max-width: 480px) {
  .page-wrapper { padding: 20px 16px 40px; }
  .welcome-section { padding: 20px; }
  .faq-section h2.section-title { font-size: 1.4em; }
}

/* ============================================================
   ARTICLE META & CTA
   ============================================================ */
.article-meta {
  color: #888;
  font-size: 0.9em;
  margin-bottom: 1.5em;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.article-main figure {
  margin: 1.5em 0;
}

.article-main figcaption {
  font-size: 0.85em;
  color: #888;
  margin-top: 6px;
  font-style: italic;
}

.article-cta {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 24px;
  margin: 32px 0 16px;
}

.article-cta-title {
  margin: 0 0 8px;
  font-weight: 600;
  color: var(--color-dark);
  font-size: 1.05em;
}

.article-cta-btn {
  display: inline-block;
  background: var(--color-accent);
  color: #fff !important;
  padding: 12px 28px;
  border-radius: 6px;
  font-weight: 600;
  text-decoration: none !important;
  margin-top: 8px;
  transition: background 0.2s;
}
.article-cta-btn:hover { background: #4db85c; }

.sidebar-ad {
  margin-top: 24px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 16px;
}

.sidebar-ad-label {
  font-weight: 600;
  color: var(--color-dark);
  margin: 0 0 8px;
  font-size: 0.95em;
}

.sidebar-ad img {
  border-radius: 4px;
  width: 100%;
}

/* ============================================================
   ARTICLE LISTING PAGE
   ============================================================ */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 24px;
}

.article-card {
  border: 1px solid var(--color-border);
  border-radius: 8px;
  overflow: hidden;
  text-decoration: none !important;
  color: inherit;
  transition: transform 0.2s, box-shadow 0.2s;
  background: var(--color-white);
}
.article-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(0,0,0,0.1);
}

.article-card-image img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  display: block;
}

.article-card-placeholder {
  height: 180px;
  background: var(--color-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5em;
  color: #ddd;
}

.article-card-body {
  padding: 16px;
}

.article-card-body h3 {
  margin: 0 0 8px;
  font-size: 1.02em;
  color: var(--color-dark);
  line-height: 1.4;
  font-weight: 600;
}

.article-card-excerpt {
  font-size: 0.88em;
  color: var(--color-secondary);
  margin: 0 0 10px;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8em;
  color: #999;
  margin: 0;
}

.article-card-source {
  background: var(--color-bg);
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.9em;
}

@media (max-width: 1024px) {
  .articles-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 600px) {
  .articles-grid { grid-template-columns: 1fr; }
  .article-card-image img { height: 160px; }
}