/* ==========================================================================
   1. Переменные и темы
   ========================================================================== */
:root {
  --bg: #000000;
  --text: #ffffff;
  --text-muted: rgba(255, 255, 255, 0.58);
  --accent: #ffffff;
  --accent-glow: rgba(255, 60, 60, 0.35);
  --muted: rgba(255, 255, 255, 0.07);
  --muted-strong: rgba(255, 255, 255, 0.14);
  --card: #0b0b0b;
  --card-elevated: #121212;
  --glass: rgba(255, 255, 255, 0.04);
  --tag-bg: rgba(255, 255, 255, 0.07);
  --tag-border: rgba(255, 255, 255, 0.14);
  --font: 'Manrope', sans-serif;
  --radius: 14px;
  --nav-height: 72px;

  /* Mountain Parallax (index.html) - Dark Theme */
  --sky-top: #110000;
  --sky-bottom: #3a0000;
  --mnt-back: #260000;
  --mnt-mid: #140000;
  --mnt-front: #000000;

  /* Mountain Backdrop (regulations-viewer.html) - Dark Theme */
  --amb-sky-bottom: #2b0000;
  --amb-mnt-back: #200000;
  --amb-mnt-mid: #120000;
}

[data-theme="light"] {
  --bg: #f5f3f3;
  --text: #161313;
  --text-muted: rgba(22, 19, 19, 0.62);
  --accent: #8c1d1d;
  --accent-glow: rgba(140, 29, 29, 0.2);
  --muted: rgba(22, 19, 19, 0.08);
  --muted-strong: rgba(22, 19, 19, 0.16);
  --card: #ffffff;
  --card-elevated: #faf8f8;
  --glass: rgba(22, 19, 19, 0.04);
  --tag-bg: rgba(140, 29, 29, 0.08);
  --tag-border: rgba(140, 29, 29, 0.22);

  /* Mountain Parallax & Backdrop - Light Theme */
  --sky-top: #e8e2e2;
  --sky-bottom: #d8c2c2;
  --mnt-back: #b89494;
  --mnt-mid: #8f6262;
  --mnt-front: #f5f3f3;

  --amb-sky-bottom: #d8c2c2;
  --amb-mnt-back: #b89494;
  --amb-mnt-mid: #8f6262;
}

/* ==========================================================================
   2. Базовые стили и фон
   ========================================================================== */
* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  letter-spacing: 0.2px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background 0.45s ease, color 0.45s ease;
  overflow-x: hidden;
}

p {
  font-size: 15.5px;
  line-height: 1.8;
  margin: 0 0 14px 0;
  color: var(--text);
}

.bg-rings {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image: radial-gradient(circle at 10% 20%, rgba(255, 255, 255, 0.02), transparent 10%),
                    radial-gradient(circle at 90% 80%, rgba(255, 255, 255, 0.02), transparent 12%);
  mix-blend-mode: overlay;
  transition: opacity 0.5s;
}

[data-theme="light"] .bg-rings {
  background-image: radial-gradient(circle at 10% 20%, rgba(140, 29, 29, 0.04), transparent 10%),
                    radial-gradient(circle at 90% 80%, rgba(140, 29, 29, 0.04), transparent 12%);
}

/* ==========================================================================
   3. Навигация и плавающий футер
   ========================================================================== */
nav {
  position: fixed;
  top: 12px;
  left: 50%;
  transform: translateX(-50%);
  height: var(--nav-height);
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 10px 22px;
  border-radius: 999px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0.01));
  border: 1px solid var(--muted);
  z-index: 120;
  backdrop-filter: blur(10px) saturate(130%);
  box-shadow: 0 6px 30px rgba(0, 0, 0, 0.35);
  transition: transform 0.25s ease, opacity 0.25s ease, box-shadow 0.25s ease;
  width: max-content;
  max-width: 95%;
}

[data-theme="light"] nav {
  background: linear-gradient(180deg, rgba(0, 0, 0, 0.02), rgba(0, 0, 0, 0.01));
  box-shadow: 0 6px 30px rgba(0, 0, 0, 0.06);
}

nav a,
#theme-toggle,
#lang-toggle {
  color: var(--text);
  text-decoration: none;
  text-transform: uppercase;
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 1.6px;
  padding: 8px 12px;
  border-radius: 8px;
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: transform 0.22s ease, color 0.22s ease;
  cursor: pointer;
  background: transparent;
  border: none;
  outline: none;
  white-space: nowrap;
  font-family: var(--font);
}

nav a:hover,
#theme-toggle:hover,
#lang-toggle:hover {
  transform: translateY(-3px);
}

nav a::after {
  content: '';
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: -6px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.28s ease;
  opacity: 0.95;
}

nav a:hover::after,
nav a.active-nav::after {
  transform: scaleX(1);
}

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

.toggle .dot {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--text);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
  transition: transform 0.3s ease, background 0.3s ease;
}

[data-theme="light"] .toggle .dot {
  transform: translateX(4px);
  background: var(--accent);
}

footer {
  position: fixed;
  bottom: 14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.01));
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1.6px;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--muted);
  z-index: 120;
  backdrop-filter: blur(8px);
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.3);
}

/* ==========================================================================
   4. Главная страница (index.html)
   ========================================================================== */
.hero {
  position: relative;
  width: 100%;
  height: 100vh;
  min-height: 600px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(to bottom, var(--sky-top), var(--sky-bottom));
  transition: background 0.45s ease;
  z-index: 10;
}

.parallax-layer {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  will-change: transform;
}

.parallax-layer svg {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  transition: fill 0.45s ease;
}

.layer-1 { z-index: 2; }
.layer-2 { z-index: 3; }
.layer-3 { z-index: 4; }

.layer-1 svg { height: 50vh; min-height: 400px; fill: var(--mnt-back); }
.layer-2 svg { height: 40vh; min-height: 300px; fill: var(--mnt-mid); }
.layer-3 svg { height: 25vh; min-height: 200px; fill: var(--mnt-front); }

.parallax-content {
  position: relative;
  z-index: 10;
  text-align: center;
  will-change: transform;
}

.parallax-content h1 {
  margin: 0;
  font-family: 'UnifrakturCook', serif;
  font-size: clamp(42px, 8vw, 84px);
  color: var(--accent);
  font-weight: normal;
  letter-spacing: 2px;
  text-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

[data-theme="light"] .parallax-content h1 {
  text-shadow: 0 4px 20px rgba(255, 255, 255, 0.8);
}

.parallax-content .sub {
  font-family: var(--font);
  font-size: 16px;
  font-weight: 800;
  letter-spacing: 2.5px;
  margin-top: 12px;
  color: var(--text);
  opacity: 0.95;
  text-transform: uppercase;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.6);
}

[data-theme="light"] .parallax-content .sub {
  text-shadow: 0 2px 10px rgba(255, 255, 255, 0.8);
}

main:not(.content-area) {
  max-width: 980px;
  margin: 0 auto 120px;
  padding: 60px 24px 0;
  text-align: center;
  z-index: 10;
  position: relative;
}

section {
  margin-bottom: 88px;
  opacity: 0;
  transform: translateY(28px) scale(0.995);
  transition: opacity 0.8s cubic-bezier(.2, .9, .2, 1), transform 0.8s cubic-bezier(.2, .9, .2, 1);
}

section.visible {
  opacity: 1;
  transform: translateY(0) scale(1);
}

.card {
  width: 100%;
  background: linear-gradient(180deg, var(--card), rgba(255, 255, 255, 0.01));
  border-radius: var(--radius);
  padding: 28px 36px;
  border: 1px solid var(--muted);
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.35);
  text-align: left;
  margin: 0 auto;
  max-width: 900px;
}

[data-theme="light"] .card {
  box-shadow: 0 8px 30px rgba(22, 19, 19, 0.06);
}

.section-title {
  font-size: 16px;
  font-weight: 800;
  letter-spacing: 3px;
  color: var(--accent);
  margin-bottom: 18px;
  text-transform: uppercase;
}

/* ==========================================================================
   5. Страница регламента (regulations-viewer.html)
   ========================================================================== */
.ambient-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 360px;
  background: linear-gradient(to bottom, var(--sky-top), var(--amb-sky-bottom), var(--bg));
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
  opacity: 0.85;
  transition: background 0.45s ease;
}

.ambient-header svg {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  transition: fill 0.45s ease;
}

.ambient-header .amb-1 { height: 220px; fill: var(--amb-mnt-back); opacity: 0.7; }
.ambient-header .amb-2 { height: 150px; fill: var(--amb-mnt-mid); opacity: 0.85; }
.ambient-header .amb-3 { height: 90px; fill: var(--mnt-front); }

.page-header {
  position: relative;
  z-index: 10;
  max-width: 1240px;
  width: 100%;
  margin: 112px auto 24px;
  padding: 0 24px;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  opacity: 0;
  transform: translateY(18px);
  animation: sectionFadeIn 0.7s cubic-bezier(.2, .9, .2, 1) forwards;
}

.page-header-titles h1 {
  margin: 0;
  font-family: 'UnifrakturCook', serif;
  font-size: clamp(32px, 5vw, 52px);
  color: var(--accent);
  font-weight: normal;
  letter-spacing: 1.5px;
  text-shadow: 0 4px 20px rgba(0, 0, 0, 0.45);
}

[data-theme="light"] .page-header-titles h1 {
  text-shadow: 0 4px 20px rgba(255, 255, 255, 0.8);
}

.page-header-titles .subtitle {
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-top: 6px;
}

.viewer-wrapper {
  position: relative;
  z-index: 10;
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  gap: 24px;
  max-width: 1240px;
  margin: 0 auto 100px;
  padding: 0 24px;
  width: 100%;
  flex: 1;
  opacity: 0;
  transform: translateY(24px);
  animation: sectionFadeIn 0.8s cubic-bezier(.2, .9, .2, 1) 0.1s forwards;
}

.sidebar {
  background: linear-gradient(180deg, var(--card), rgba(255, 255, 255, 0.01));
  border-radius: var(--radius);
  border: 1px solid var(--muted);
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.35);
  padding: 24px;
  align-self: flex-start;
  position: sticky;
  top: 104px;
  max-height: calc(100vh - 160px);
  display: flex;
  flex-direction: column;
  backdrop-filter: blur(10px);
}

[data-theme="light"] .sidebar {
  box-shadow: 0 8px 30px rgba(22, 19, 19, 0.06);
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--muted);
}

.sidebar-title {
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 2.5px;
  color: var(--accent);
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 8px;
}

.doc-count-badge {
  font-size: 11px;
  font-weight: 800;
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--tag-bg);
  border: 1px solid var(--tag-border);
  color: var(--accent);
  letter-spacing: 0.5px;
}

.doc-list {
  list-style: none;
  padding: 0 6px 0 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
  overflow-y: auto;
  overflow-x: hidden;
}

.doc-btn {
  width: 100%;
  text-align: left;
  background: var(--glass);
  border: 1px solid var(--muted);
  color: var(--text);
  padding: 14px 16px;
  border-radius: 10px;
  font-family: var(--font);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: transform 0.22s ease, background 0.22s ease, border-color 0.22s ease, box-shadow 0.22s ease;
}

.doc-btn::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--accent);
  transform: scaleY(0);
  transition: transform 0.25s ease;
}

.doc-btn:hover {
  background: var(--muted);
  border-color: var(--muted-strong);
  transform: translateX(4px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.22);
}

.doc-btn:hover::before {
  transform: scaleY(0.6);
}

.doc-btn.active {
  background: var(--text);
  color: var(--bg);
  border-color: var(--text);
  box-shadow: 0 6px 24px rgba(255, 255, 255, 0.14);
  transform: translateX(4px);
}

.doc-btn.active::before {
  transform: scaleY(1);
  background: var(--bg);
}

[data-theme="light"] .doc-btn.active {
  background: var(--accent);
  color: #ffffff;
  border-color: var(--accent);
  box-shadow: 0 6px 24px rgba(140, 29, 29, 0.25);
}

[data-theme="light"] .doc-btn.active::before {
  background: #ffffff;
}

.doc-btn-title {
  font-size: 14.5px;
  font-weight: 700;
  line-height: 1.35;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.content-area {
  min-width: 0;
  background: linear-gradient(180deg, var(--card), rgba(255, 255, 255, 0.01));
  border-radius: var(--radius);
  border: 1px solid var(--muted);
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.35);
  padding: 36px 42px;
  min-height: 62vh;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow-x: hidden;
}

[data-theme="light"] .content-area {
  box-shadow: 0 8px 30px rgba(22, 19, 19, 0.06);
}

.doc-meta-header {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding-bottom: 16px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--muted);
}

.doc-close-btn {
  background: var(--glass);
  border: 1px solid var(--muted);
  color: var(--text-muted);
  padding: 6px 12px;
  border-radius: 8px;
  font-family: var(--font);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.2s ease;
}

.doc-close-btn:hover {
  color: var(--text);
  border-color: var(--muted-strong);
  transform: translateY(-2px);
}

.state-box {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 48px 24px;
  max-width: 520px;
  margin: 0 auto;
  animation: docFadeIn 0.45s ease forwards;
}

.state-icon {
  width: 68px;
  height: 68px;
  border-radius: 50%;
  background: var(--glass);
  border: 1px solid var(--muted-strong);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  color: var(--accent);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.25);
}

.state-title {
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 10px;
}

.state-desc {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-muted);
  margin: 0 0 22px 0;
}

.quick-docs-wrap {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-top: 6px;
}

.quick-doc-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 10px;
  background: var(--glass);
  border: 1px solid var(--muted-strong);
  color: var(--text);
  font-family: var(--font);
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.quick-doc-pill:hover {
  transform: translateY(-2px);
  background: var(--muted);
  border-color: var(--accent);
}

.loader-box {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 50px 24px;
  text-align: center;
}

.loader-spinner {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 3px solid var(--muted);
  border-top-color: var(--accent);
  animation: spin 0.8s linear infinite;
  margin-bottom: 16px;
}

.loader-title {
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-muted);
}

.markdown-body {
  font-size: 16px;
  line-height: 1.8;
  color: var(--text);
  overflow-wrap: break-word;
  word-wrap: break-word;
  max-width: 100%;
  animation: docFadeIn 0.45s cubic-bezier(.2, .9, .2, 1) forwards;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3 {
  color: var(--accent);
  margin-top: 1.5em;
  margin-bottom: 0.5em;
  font-weight: 800;
}

.markdown-body h1 {
  font-size: 2.2em;
  font-family: 'UnifrakturCook', serif;
  font-weight: normal;
  letter-spacing: 1px;
  margin-top: 0;
}

.markdown-body h2 {
  font-size: 1.55em;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--muted);
}

.markdown-body h3 {
  font-size: 1.25em;
}

.markdown-body p {
  font-size: 16px;
  margin-bottom: 1.2em;
}

.markdown-body a {
  color: var(--accent);
  text-decoration: underline;
  font-weight: 700;
}

.markdown-body ul,
.markdown-body ol {
  margin-bottom: 1.2em;
  padding-left: 22px;
}

.markdown-body li {
  margin-bottom: 0.45em;
}

.markdown-body blockquote {
  border-left: 4px solid var(--accent);
  margin: 0 0 1.2em 0;
  padding: 12px 20px;
  background: var(--muted);
  border-radius: 0 10px 10px 0;
  font-style: italic;
}

.markdown-body code {
  background: var(--muted);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: monospace;
  font-size: 0.9em;
  word-break: break-word;
}

.markdown-body pre {
  background: var(--bg);
  padding: 16px;
  border-radius: 10px;
  border: 1px solid var(--muted);
  overflow-x: auto;
  max-width: 100%;
  margin-bottom: 1.2em;
}

.markdown-body pre code {
  background: transparent;
  padding: 0;
  font-size: 14px;
  word-break: normal;
}

/* ==========================================================================
   6. Анимации и адаптивность
   ========================================================================== */
@keyframes sectionFadeIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes docFadeIn {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 900px) {
  .viewer-wrapper {
    grid-template-columns: 1fr;
    padding: 0 16px;
  }
  .page-header {
    padding: 0 16px;
    margin-top: 100px;
  }
  .sidebar {
    width: 100%;
    position: static;
    max-height: 320px;
  }
  nav {
    gap: 10px;
    padding: 8px 14px;
  }
  nav a,
  #theme-toggle,
  #lang-toggle {
    font-size: 12px;
    padding: 6px 10px;
  }
  .content-area {
    padding: 24px 20px;
  }
}

@media (max-width: 720px) {
  nav {
    gap: 12px;
    padding: 8px 12px;
  }
  .card {
    padding: 20px;
  }
  .section-title {
    font-size: 14px;
  }
  .layer-1 svg { height: 40vh; }
  .layer-2 svg { height: 30vh; }
  .layer-3 svg { height: 20vh; }
}