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

:root {
  --bg: #eef1f6;
  --surface: #ffffff;
  --primary: #a674fe;
  --primary-hover: #8f5ae8;
  --secondary: #7492fe;
  --text: #273043;
  --text-light: #5a6478;
  --border: #dde2ea;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 2px 12px rgba(39, 48, 67, 0.06);
  --shadow-lg: 0 8px 32px rgba(39, 48, 67, 0.10);
  --transition: 0.2s ease-in-out;
}

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

body {
  font-family: 'Google Sans', 'Segoe UI', sans-serif;
  font-size: 16px;
  line-height: 1.5;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

/* === Header === */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: transparent;
  padding: 16px 20px;
  transform: translateY(0);
  transition: background 0.4s ease, box-shadow 0.4s ease, opacity 0.4s ease, transform 0.4s ease;
}

.header.pinned {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  box-shadow: 0 2px 16px rgba(39, 48, 67, 0.15);
}

.header-inner {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  text-decoration: none;
  display: flex;
  align-items: center;
}

.logo-img {
  height: 20px;
  width: auto;
  filter: brightness(0) invert(1);
}

/* === Hamburger Menu Toggle === */
.menu-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: rgba(255, 255, 255, 0.15);
  border: none;
  border-radius: 10px;
  cursor: pointer;
  padding: 8px;
  transition: var(--transition);
}

.menu-toggle:hover,
.header-search-btn:hover {
  background: rgba(255, 255, 255, 0.25);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.header-search-btn {
  display: none;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: rgba(255, 255, 255, 0.15);
  border: none;
  border-radius: 10px;
  cursor: pointer;
  padding: 0;
  transition: var(--transition);
  color: #fff;
}

.header-search-btn svg {
  width: 18px;
  height: 18px;
}

.header.pinned .header-search-btn {
  display: flex;
}

.menu-toggle span {
  display: block;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: var(--transition);
}

/* === Sidebar === */
.menu-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(39, 48, 67, 0.5);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.menu-overlay.visible {
  display: block;
}

.sidebar {
  position: fixed;
  top: 0;
  right: -300px;
  width: 280px;
  height: 100%;
  z-index: 300;
  background: var(--surface);
  box-shadow: -4px 0 24px rgba(39, 48, 67, 0.15);
  transition: right 0.3s ease;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

.sidebar.open {
  right: 0;
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 20px;
  border-bottom: 1px solid var(--border);
}

.sidebar-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}

.sidebar-close {
  background: none;
  border: none;
  font-size: 24px;
  color: var(--text-light);
  cursor: pointer;
  padding: 4px;
  line-height: 1;
}

.sidebar-links {
  padding: 12px 0;
  flex: 1;
}

.sidebar-link {
  display: block;
  width: 100%;
  padding: 12px 20px;
  background: none;
  border: none;
  text-align: left;
  font-family: inherit;
  font-size: 15px;
  color: var(--text-light);
  cursor: pointer;
  transition: var(--transition);
}

.sidebar-link:hover {
  background: var(--bg);
  color: var(--primary);
}

.sidebar-link.active {
  color: var(--primary);
  font-weight: 600;
  background: var(--bg);
}

.sidebar-divider {
  height: 1px;
  background: var(--border);
  margin: 8px 20px;
}

/* === Hero === */
.hero {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  padding: 72px 20px 40px;
  text-align: left;
}

.hero-inner {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 20px;
}

.hero h1 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 8px;
  line-height: 1.25;
}

.hero p {
  font-size: 15px;
  opacity: 0.9;
  max-width: 480px;
}

/* === Search === */
.search-wrap {
  max-width: 720px;
  margin: -24px auto 0;
  padding: 0 20px;
  position: relative;
  z-index: 10;
}

.search-box {
  display: flex;
  align-items: center;
  background: var(--surface);
  border-radius: 30px;
  padding: 12px 20px;
  box-shadow: var(--shadow-lg);
  gap: 12px;
}

.search-box svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  color: var(--text-light);
}

.search-box input {
  flex: 1;
  border: none;
  outline: none;
  font-family: inherit;
  font-size: 16px;
  color: var(--text);
  background: transparent;
}

.search-box input::placeholder {
  color: var(--text-light);
}

.search-clear {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-light);
  padding: 4px;
  line-height: 1;
  font-size: 18px;
}

.search-clear.visible {
  display: block;
}

/* === Category Navigation (hidden, using sidebar) === */
.category-nav {
  display: none;
}

/* === Content === */
.content {
  max-width: 720px;
  margin: 24px auto 32px;
  padding: 0 20px;
}

/* === Category Section === */
.category-section {
  margin-bottom: 24px;
}

.category-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 12px;
  padding-left: 4px;
}

/* === Accordion === */
.accordion-item {
  background: var(--surface);
  border-radius: var(--radius);
  margin-bottom: 8px;
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: var(--transition);
}

.accordion-item:hover {
  box-shadow: var(--shadow-lg);
}

.accordion-header {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  background: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
  font-size: 15px;
  font-weight: 500;
  color: var(--text);
  text-align: left;
  gap: 12px;
  transition: var(--transition);
}

.accordion-header:hover {
  color: var(--primary);
}

.accordion-chevron {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  transition: transform var(--transition);
  color: var(--text-light);
}

.accordion-item.open .accordion-chevron {
  transform: rotate(180deg);
  color: var(--primary);
}

.accordion-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.accordion-content {
  padding: 0 20px 20px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--text-light);
}

.accordion-content strong {
  color: var(--text);
  font-weight: 600;
}

.accordion-content ul {
  padding-left: 20px;
  margin: 8px 0;
}

.accordion-content li {
  margin-bottom: 4px;
}

.accordion-content code {
  background: var(--bg);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 13px;
}

.accordion-content a {
  color: var(--primary);
  text-decoration: none;
}

.accordion-content a:hover {
  text-decoration: underline;
}

.accordion-content img {
  display: block;
  max-width: 100%;
  border-radius: var(--radius-sm);
  margin: 12px 0;
  border: 1px solid var(--border);
  cursor: zoom-in;
}

/* === Image Lightbox === */
.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: rgba(39, 48, 67, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  align-items: center;
  justify-content: center;
  padding: 20px;
  cursor: zoom-out;
}

.lightbox.visible {
  display: flex;
}

.lightbox img {
  max-width: 100%;
  max-height: 90vh;
  border-radius: var(--radius);
  box-shadow: 0 16px 64px rgba(0, 0, 0, 0.3);
}

/* === No Results === */
.no-results {
  text-align: center;
  padding: 48px 20px;
  color: var(--text-light);
  display: none;
}

.no-results.visible {
  display: block;
}

.no-results svg {
  width: 48px;
  height: 48px;
  margin-bottom: 12px;
  opacity: 0.4;
}

.no-results p {
  font-size: 15px;
}

/* === Contacts Section === */
.contacts-section {
  max-width: 720px;
  margin: 0 auto 24px;
  padding: 0 20px;
}

.contacts-inner {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  color: #fff;
}

.contacts-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
}

.contacts-text {
  font-size: 14px;
  opacity: 0.9;
  margin-bottom: 20px;
}

.contacts-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background: #fff;
  color: var(--primary);
  border-radius: 30px;
  text-decoration: none;
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  transition: var(--transition);
}

.contacts-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}

.contacts-btn svg {
  width: 20px;
  height: 20px;
}

/* === Footer === */
.footer {
  border-top: 1px solid var(--border);
  padding: 16px 20px;
  text-align: center;
}

.footer a {
  color: var(--primary);
  text-decoration: none;
  font-size: 13px;
  font-weight: 500;
}

.footer a:hover {
  text-decoration: underline;
}

/* === Install Banner === */
.install-banner {
  display: none;
  max-width: 720px;
  margin: 24px auto 0;
  padding: 0 20px;
}

.install-banner.visible {
  display: block;
}

.install-banner-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--surface);
  border-radius: var(--radius);
  padding: 14px 20px;
  box-shadow: var(--shadow);
  gap: 12px;
}

.install-banner-inner p {
  font-size: 14px;
  color: var(--text-light);
}

.install-btn {
  flex-shrink: 0;
  padding: 8px 20px;
  border-radius: 30px;
  border: none;
  background: var(--primary);
  color: #fff;
  font-family: inherit;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.install-btn:hover {
  background: var(--primary-hover);
}

/* === Share Button === */
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background: var(--surface);
  color: var(--primary);
  border-radius: 30px;
  border: none;
  text-decoration: none;
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.share-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.share-btn svg {
  width: 18px;
  height: 18px;
}

.sidebar-share {
  padding: 12px 20px;
}

.sidebar-share .share-btn {
  width: 100%;
  justify-content: center;
  padding: 10px 16px;
  font-size: 14px;
  background: var(--bg);
}

/* === Install Hint (iOS) === */
.install-hint {
  display: none;
  max-width: 720px;
  margin: 16px auto 0;
  padding: 0 20px;
}

.install-hint.visible {
  display: block;
}

.install-hint-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--surface);
  border-radius: var(--radius);
  padding: 14px 20px;
  box-shadow: var(--shadow);
  gap: 12px;
}

.install-hint-inner p {
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.5;
}

.install-hint-close {
  flex-shrink: 0;
  background: none;
  border: none;
  font-size: 20px;
  color: var(--text-light);
  cursor: pointer;
  padding: 4px;
  line-height: 1;
}

/* === Responsive === */
@media (min-width: 768px) {
  .hero h1 {
    font-size: 36px;
  }
  .hero {
    padding: 64px 20px 52px;
  }
  .search-wrap {
    margin-top: -28px;
  }
  .accordion-header {
    font-size: 16px;
    padding: 18px 24px;
  }
  .accordion-content {
    padding: 0 24px 24px;
    font-size: 15px;
  }
}