/* style.css — CatSudo (финальная версия с анимациями + улучшенные документы) */

:root {
  --bg: #fafafa;
  --text: #1a1a1a;
  --accent: #8b5cf6;
  --card: #ffffff;
  --header-bg: #ffffff;
  --shadow: 0 10px 25px rgba(0,0,0,.07);
  --border: rgba(0,0,0,.1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f172a;
    --text: #f1f5f9;
    --accent: #a78bfa;
    --card: #1e293b;
    --header-bg: #1e293b;
    --border: rgba(255,255,255,.1);
    --shadow: 0 10px 25px rgba(0,0,0,.2);
  }
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  min-height: 100vh;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* === HEADER === */
header {
  background: var(--header-bg);
  box-shadow: 0 2px 10px rgba(0,0,0,.1);
  position: sticky;
  top: 0;
  z-index: 1000;
  animation: fadeInDown 0.8s ease-out;
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
  max-width: 900px;
  margin: 0 auto;
}

.logo {
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--accent);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: .5rem;
  transition: transform .2s ease;
}

.logo:hover { transform: scale(1.05); }

.logo img {
  width: 50px;
  height: 50px;
  animation: logoFloat 0s ease-in-out infinite;
}

@keyframes logoFloat {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-4px) rotate(3deg); }
}

.nav-links {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav-links a {
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
  transition: color .2s;
}

.nav-links a:hover { color: var(--accent); }

/* === КНОПКИ === */
.btn {
  background: var(--accent);
  color: white !important;
  padding: .6rem 1.2rem;
  border-radius: .5rem;
  font-weight: 600;
  text-decoration: none;
  transition: all .2s ease;
  display: inline-block;
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 15px rgba(139, 92, 246, .3);
  animation: pulse 2s infinite;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(139, 92, 246, .4);
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 4px 15px rgba(139, 92, 246, .3); }
  50% { box-shadow: 0 8px 25px rgba(139, 92, 246, .5); }
}

.btn-soft {
  display: inline-block;
  background: rgba(139, 92, 246, 0.08);
  color: var(--accent);
  padding: 0.6rem 1.2rem;
  border-radius: 0.5rem;
  font-weight: 600;
  text-decoration: none;
  font-size: 1rem;
  transition: all 0.25s ease;
  border: 1.5px solid transparent;
  position: relative;
  overflow: hidden;
}

.btn-soft::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: var(--accent);
  opacity: 0;
  transition: opacity 0.25s ease;
  z-index: -1;
}

.btn-soft:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(139, 92, 246, 0.2);
  background: rgba(139, 92, 246, 0.15);
  border-color: rgba(139, 92, 246, 0.3);
}

.btn-soft:hover::before { opacity: 0.08; }

@media (prefers-color-scheme: dark) {
  .btn-soft {
    background: rgba(167, 139, 250, 0.12);
  }
  .btn-soft:hover {
    background: rgba(167, 139, 250, 0.2);
    box-shadow: 0 6px 16px rgba(167, 139, 250, 0.25);
  }
}

/* === ВЫПАДАЮЩЕЕ МЕНЮ === */
.dropdown {
  position: relative;
  display: inline-block;
}

.dropdown-btn {
  background: none;
  border: none;
  font: inherit;
  color: var(--text);
  cursor: pointer;
  font-weight: 500;
  padding: 0.75rem 1rem;
  border-radius: 0.5rem;
  transition: all 0.2s ease;
  position: relative;
  z-index: 1001;
}

.dropdown-btn:hover,
.dropdown:hover .dropdown-btn {
  color: var(--accent);
  background: rgba(139, 92, 246, 0.08);
}

.dropdown-content {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 260px;
  background: var(--card);
  border-radius: 0.75rem;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-12px);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  pointer-events: none;
  z-index: 1000;
  overflow: hidden;
}

.dropdown-content a {
  display: block;
  padding: 0.85rem 1.2rem;
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
  transition: background 0.2s ease;
  border-bottom: 1px solid var(--border);
}

.dropdown-content a:last-child { border-bottom: none; }

.dropdown-content a:hover {
  background: rgba(139, 92, 246, 0.12);
  color: var(--accent);
}

.dropdown:hover .dropdown-content,
.dropdown:focus-within .dropdown-content {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
}

.dropdown::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  width: 100%;
  height: 20px;
  transform: translateX(-50%);
  background: transparent;
  z-index: 1000;
}

/* === КОНТЕНТ === */
main { padding: 4rem 0; }

.page {
  background: var(--card);
  padding: 3rem 2rem;
  border-radius: 1rem;
  box-shadow: var(--shadow);
  margin-top: 2rem;
}

/* === УЛУЧШЕННЫЕ ОТСТУПЫ В ДОКУМЕНТАХ === */
.page > h1,
.page > h2 {
  margin-bottom: 1.2rem !important;
  color: var(--accent);
}

.page > p,
.page > ul {
  margin-bottom: 0.9rem !important;
  line-height: 1.75;
  font-size: 1rem;
}

/* Отступы между пунктами 1.1, 1.2 и т.д. */
.page > p + p {
  margin-top: 0.7rem;
}

/* Отступ после h2 */
.page > h2 + p,
.page > h2 + ul {
  margin-top: 0.6rem;
}

/* Списки */
.page ul {
  padding-left: 1.8rem;
  margin-top: 0.5rem;
}

.page ul li {
  margin-bottom: 0.5rem;
  position: relative;
}

.page ul li::marker {
  color: var(--accent);
}

/* Подсветка номеров пунктов */
.page > p > strong:first-child {
  color: var(--accent);
  font-weight: 600;
}

/* Финальный контакт */
.page > p:last-child {
  margin-top: 2.5rem;
  font-size: 0.95rem;
  color: #64748b;
}

/* === АНИМАЦИИ === */
h1, h2, h3 {
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.7s ease;
}

h1.animated, h2.animated, h3.animated {
  opacity: 1;
  transform: translateY(0);
}

h1 { font-size: 2.5rem; margin-bottom: .5rem; }
h2 { font-size: 1.6rem; margin: 2rem 0 1rem; }

ul { padding-left: 1.5rem; margin: 1rem 0; }

footer {
  text-align: center;
  padding: 2rem 0;
  color: #64748b;
  font-size: .9rem;
  margin-top: 4rem;
}

/* === КАРТОЧКИ ПРЕИМУЩЕСТВ === */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  margin-top: 3rem;
}

.feature-item {
  text-align: center;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 100px;
  padding: 1rem;
  background: rgba(139, 92, 246, 0.04);
  border-radius: 0.75rem;
  opacity: 0;
  transform: scale(0.95) translateY(20px);
  transition: all 0.6s ease;
}

.feature-item.animated {
  opacity: 1;
  transform: scale(1) translateY(0);
}

.feature-item:hover {
  background: rgba(139, 92, 246, 0.08);
  transform: translateY(-4px);
  box-shadow: 0 6px 16px rgba(139, 92, 246, 0.15);
}

.feature-item h2 {
  margin: 0 0 0.5rem;
  font-size: 1.25rem;
  color: var(--accent);
}

.feature-item p {
  margin: 0;
  font-size: 0.95rem;
  color: #64748b;
}

.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.animate-on-scroll.animated {
  opacity: 1;
  transform: translateY(0);
}

@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* === ССЫЛКИ === */
a {
  text-decoration: none !important;
  color: inherit !important;
  outline: none !important;
}

a:hover {
  text-decoration: underline;
  text-decoration-color: rgba(139, 92, 246, 0.4);
  text-underline-offset: 3px;
}

a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

/* === АДАПТИВНОСТЬ === */
@media (max-width: 768px) {
  .nav-links { gap: 1rem; font-size: .9rem; }
  .logo { font-size: 1.3rem; }
  .logo img { width: 28px; height: 28px; }

  .dropdown-content {
    position: static;
    display: none;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    border-top: none;
    border-radius: 0 0 0.75rem 0.75rem;
    margin-top: 0;
    overflow: hidden;
    background: var(--card);
  }

  .dropdown-content[style*="block"] { display: block !important; }

  .dropdown-btn {
    border-radius: 0.75rem 0.75rem 0 0 !important;
    margin-bottom: 0;
  }

  .btn-soft { padding: 0.5rem 1rem; font-size: 0.95rem; }

  .page { padding: 2rem 1.5rem; }
  h1 { font-size: 2rem; }
}

@media (max-width: 480px) {
  .container { padding: 0 0.5rem; }
  .page { padding: 2rem 1.5rem; }
  h1 { font-size: 2rem; }
}

/* === КОНТАКТЫ === */
#contact {
  padding: 1.5rem 2rem !important;
  margin-top: 2rem;
}

#contact h2 {
  margin: 0 0 0.75rem !important;
  font-size: 1.6rem;
}

#contact p {
  margin: 0 !important;
  font-size: 1rem;
  color: #94a3b8;
}

/* === ПЛАВНАЯ СМЕНА КОНТЕНТА === */
#content > * {
  animation: fadeIn 0.5s ease-out;
}

/* === КНОПКА "НАВЕРХ" === */
#scrollTopBtn {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 999;
  background: var(--accent);
  color: white;
  border: none;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(139, 92, 246, 0.3);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all 0.3s ease;
  padding: 0;
}

#scrollTopBtn:hover {
  transform: translateY(-2px) scale(1.05);
  box-shadow: 0 8px 20px rgba(139, 92, 246, 0.4);
}

#scrollTopBtn.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* Мобильная адаптация */
@media (max-width: 768px) {
  #scrollTopBtn {
    bottom: 1.5rem;
    right: 1.5rem;
    width: 44px;
    height: 44px;
  }
}