/* ============================================
   НВО Навигатор — Modern Design v2
   Replaces: skeleton.css + custom.css
   ============================================ */

/* --- CSS Variables --- */
:root {
  --color-primary: #1e40af;
  --color-primary-light: #3b82f6;
  --color-primary-lighter: #dbeafe;
  --color-primary-dark: #1e3a8a;
  --color-accent: #f59e0b;
  --color-accent-light: #fef3c7;

  --color-surface: #ffffff;
  --color-bg: #f1f5f9;
  --color-bg-alt: #f8fafc;

  --color-text: #1e293b;
  --color-text-muted: #64748b;
  --color-text-light: #94a3b8;

  --color-border: #e2e8f0;
  --color-border-light: #f1f5f9;

  --color-success: #22c55e;
  --color-danger: #ef4444;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.04);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-full: 9999px;

  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "Cascadia Code", "Fira Code", monospace;

  --container-max: 1400px;
  --header-height: 60px;

  --color-surface-glass: rgba(255,255,255,0.95);
}

/* --- Dark Theme --- */
[data-theme="dark"] {
  --color-primary: #3b82f6;
  --color-primary-light: #60a5fa;
  --color-primary-lighter: #1e3a5f;
  --color-primary-dark: #2563eb;
  --color-accent: #f59e0b;
  --color-accent-light: #451a03;

  --color-surface: #1e293b;
  --color-bg: #0f172a;
  --color-bg-alt: #1e293b;

  --color-text: #e2e8f0;
  --color-text-muted: #94a3b8;
  --color-text-light: #64748b;

  --color-border: #334155;
  --color-border-light: #1e293b;

  --color-success: #4ade80;
  --color-danger: #f87171;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.4), 0 2px 4px -2px rgba(0,0,0,0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.5), 0 4px 6px -4px rgba(0,0,0,0.3);

  --color-surface-glass: rgba(15, 23, 42, 0.95);
}

[data-theme="dark"] .site-footer {
  background: #0b1120;
  color: var(--color-text-muted);
}

[data-theme="dark"] .rank-cell {
  background-color: transparent !important;
}

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

html {
  scroll-behavior: smooth;
  font-size: 15px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.6;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 0.5em 0;
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text);
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.1rem; }

p {
  margin: 0 0 1em 0;
}

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

a:hover {
  color: var(--color-primary-light);
  text-decoration: underline;
}

hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 1.5rem 0;
}

ul {
  padding-left: 1.2em;
}

img {
  max-width: 100%;
}

/* --- Layout --- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.row {
  margin-bottom: 0.25rem;
}

.row:empty,
.row:has(> :only-child:is(br)) {
  margin-bottom: 0.75rem;
}

.u-pull-right {
  float: right;
}

/* --- Sticky Header --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(8px);
  background: var(--color-surface-glass);
}

.header-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  gap: 1rem;
}

.site-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
  text-decoration: none;
  color: inherit;
}

.site-brand:hover,
.site-brand:focus {
  text-decoration: none;
}

.site-logo-icon {
  width: 24px;
  height: 24px;
  color: var(--color-primary);
}

.site-name {
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--color-primary-dark);
  letter-spacing: -0.02em;
}

.grade-tabs {
  display: flex;
  gap: 0.25rem;
}

.grade-tab {
  padding: 0.4rem 1rem;
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: all 0.2s ease;
  text-decoration: none;
  white-space: nowrap;
}

.grade-tab:hover {
  background: var(--color-bg);
  color: var(--color-primary);
  text-decoration: none;
}

.grade-tab.active {
  background: var(--color-primary);
  color: white;
}

.grade-tab.active:hover {
  background: var(--color-primary-dark);
  color: white;
  text-decoration: none;
}

/* --- Hero Section --- */
.hero-section {
  padding: calc(var(--header-height) * 0.4) 0 1.5rem 0;
}

.page-title {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-primary-dark);
  margin-bottom: 0.35rem;
  letter-spacing: -0.03em;
}

.page-title-link,
.page-title-link:visited {
  color: inherit;
  text-decoration: none;
}

.page-title-link:hover,
.page-title-link:focus {
  color: var(--color-primary);
  text-decoration: none;
}

.page-subtitle {
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text-light);
  margin: 0 0 1.45rem 0;
}

/* --- Hero Card Grid --- */
.hero-card {
  padding: 1.5rem 1.5rem 1rem 1.5rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.hero-left p,
.hero-right p {
  font-size: 1rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 0.5rem;
}

.hero-left .crypto-info,
.hero-right .crypto-info {
  font-size: 0.7rem !important;
  word-break: break-all;
  padding: 0.5rem;
  background: var(--color-bg-alt);
  border-radius: var(--radius-sm);
  margin-top: 0.5rem;
}

/* --- Quote Strip --- */
.quote-strip {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.75rem 1rem;
  margin-top: 1rem;
  background: var(--color-bg-alt);
  border-radius: var(--radius-sm);
}

.quote-strip .quote {
  font-style: italic;
  color: var(--color-text-muted);
  font-size: 0.85rem;
  line-height: 1.4;
}

.quote-strip .quote-sep {
  color: var(--color-text-light);
  font-size: 0.8rem;
}

.quote-strip .author {
  color: var(--color-text-light);
  font-size: 0.8rem;
  font-weight: 500;
  white-space: nowrap;
}

/* --- Card --- */
.card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border-light);
}

.card-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-primary-lighter);
}

/* --- Quick Links --- */
.quick-links {
  display: flex;
  flex-direction: column;
}

.nav-links-grid {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.nav-link-item {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.nav-link-item a:first-child {
  font-weight: 500;
}

.years-nav {
  font-size: 0.85em;
  color: var(--color-text-muted);
}

.years-nav a {
  color: var(--color-text-muted);
  font-size: 0.95em;
}

.years-nav a:hover {
  color: var(--color-primary);
}

.nav-extra {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--color-border-light);
}

.nav-extra a {
  font-size: 0.9rem;
  font-weight: 500;
}

.nav-section-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-light);
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--color-border-light);
}

/* --- Scroll offset for sticky header --- */
[id] {
  scroll-margin-top: calc(var(--header-height) + 1rem);
}

/* --- Section Dividers --- */
.section-divider {
  border: none;
  border-top: 2px solid var(--color-border);
  margin: 2rem 0 0 0;
}

/* --- Charts Section --- */
.charts-section {
  padding: 0;
}

.chart-separator {
  height: 2rem;
}

/* --- City Navigation --- */
.city-nav-section {
  padding: 1rem 0;
}

.city-nav-section strong {
  display: inline-block;
  font-size: 1rem;
  color: var(--color-text);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.85rem;
}

.other-cities-collapsed {
  display: none;
}

.other-cities-toggle {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-primary);
  cursor: pointer;
  text-decoration: none;
  user-select: none;
}

.other-cities-toggle:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

/* --- Buttons (Skeleton replacement) --- */
.button,
button,
input[type="submit"],
input[type="reset"],
input[type="button"] {
  display: inline-block;
  padding: 0.4rem 0.9rem;
  margin: 0.2rem 0.25rem 0.2rem 0;
  font-size: 0.85rem;
  font-weight: 500;
  font-family: var(--font-sans);
  line-height: 1.4;
  text-align: center;
  white-space: nowrap;
  vertical-align: middle;
  cursor: pointer;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-full);
  background-color: var(--color-surface);
  color: var(--color-text);
  text-decoration: none;
  text-transform: none;
  transition: all 0.15s ease;
  box-shadow: var(--shadow-sm);
}

.button:hover,
button:hover,
input[type="submit"]:hover,
input[type="reset"]:hover,
input[type="button"]:hover {
  border-color: var(--color-primary-light);
  color: var(--color-primary);
  background-color: var(--color-primary-lighter);
  box-shadow: var(--shadow-md);
  text-decoration: none;
}

.button:active,
button:active {
  transform: scale(0.97);
}

.button-primary,
button.button-primary,
input[type="submit"].button-primary,
input[type="reset"].button-primary,
input[type="button"].button-primary {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: white;
}

.button-primary:hover {
  background-color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  color: white;
}

.button:focus,
button:focus {
  outline: 2px solid var(--color-primary-light);
  outline-offset: 2px;
}

/* Group buttons (Топ N) */
button.mbtn {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: var(--color-accent-light);
  font-weight: 600;
}

button.mbtn:hover {
  background: var(--color-accent);
  color: white;
  border-color: var(--color-accent);
}

button.mbtn.button-primary {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: white;
}

/* --- Tables --- */
table {
  border-collapse: separate;
  border-spacing: 0;
  margin: 1rem auto;
  font-size: 0.85rem;
  background: var(--color-surface);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

thead {
  background: var(--color-bg);
}

thead th {
  padding: 0.6rem 0.5rem;
  text-align: left;
  font-weight: 600;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-bottom: 2px solid var(--color-border);
  white-space: nowrap;
  overflow: hidden;
}

thead th[data-sortable="1"] {
  cursor: pointer;
  user-select: none;
}

thead th[data-sortable="1"]:hover {
  background: var(--color-border-light);
  color: var(--color-primary);
}

tbody tr {
  transition: background-color 0.1s ease;
}

tbody tr:nth-child(even) {
  background-color: var(--color-bg-alt);
}

tbody tr:hover {
  background-color: var(--color-primary-lighter);
}

td {
  padding: 0.5rem;
  border-bottom: 1px solid var(--color-border-light);
  overflow: hidden;
  white-space: nowrap;
}

td a {
  font-weight: 500;
}

/* Subtle dotted vertical dividers between all columns */
thead th + th,
tbody td + td {
  border-left: 1px dotted var(--color-border);
}

/* --- School Report PDF Link --- */
.school-report-link {
  cursor: pointer;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: none;
  padding: 0.15rem 0.4rem;
  border-radius: var(--radius-sm);
  transition: background-color 0.15s ease, color 0.15s ease;
}

.school-report-link:hover {
  background-color: var(--color-primary);
  color: white;
}

/* --- Fixed Floating Buttons --- */
.buttons-fixed {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 99;
  display: none;
  gap: 0.5rem;
  margin-bottom: 0;
}

.buttons-fixed button {
  border-radius: var(--radius-full);
  padding: 0.6rem 1.2rem;
  font-weight: 600;
  font-size: 0.9rem;
  box-shadow: var(--shadow-lg);
  border: none;
  backdrop-filter: blur(8px);
  transition: all 0.2s ease;
}

.buttons-fixed button:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 20px -5px rgba(30,64,175,0.25);
}

/* --- Footer --- */
.site-footer {
  background: var(--color-text);
  color: var(--color-border);
  padding: 1rem 0;
  margin-top: 3rem;
}

.footer-minimal {
  text-align: center;
  font-size: 0.8rem;
  color: var(--color-text-light);
  margin: 0;
}

/* --- Schools Section Styling --- */
#schools .row {
  margin-bottom: 0.25rem;
}

#schools strong {
  font-size: 1.2rem;
  color: var(--color-primary-dark);
}

/* --- Theme Toggle --- */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  padding: 0;
  margin: 0;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  background: var(--color-bg);
  color: var(--color-text-muted);
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
  flex-shrink: 0;
  box-shadow: none;
}

.theme-toggle {
  -webkit-tap-highlight-color: transparent;
}

@media (hover: hover) {
  .theme-toggle:hover {
    color: var(--color-accent);
    border-color: var(--color-accent);
    background: var(--color-accent-light);
    box-shadow: none;
    transform: none;
  }
}

.theme-toggle:focus {
  outline: 2px solid var(--color-primary-light);
  outline-offset: 2px;
}

.theme-toggle:focus:not(:focus-visible) {
  outline: none;
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
  display: block;
}

.theme-toggle .icon-sun {
  display: none;
}

[data-theme="dark"] .theme-toggle .icon-sun {
  display: block;
}

[data-theme="dark"] .theme-toggle .icon-moon {
  display: none;
}

/* --- Select / Dropdown Controls --- */
select {
  appearance: none;
  background-color: var(--color-surface);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2364748b' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.6rem center;
  padding-right: 2rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  line-height: 1.4;
  cursor: pointer;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

select:hover {
  border-color: var(--color-text-light);
}

select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px var(--color-primary-lighter);
}

[data-theme="dark"] select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2394a3b8' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
}

/* --- Responsive --- */
@media (max-width: 600px) {
  .header-inner {
    position: relative;
    flex-direction: column;
    height: auto;
    padding: 0.5rem 1rem;
    gap: 0.5rem;
  }

  .theme-toggle {
    position: absolute;
    top: 0.5rem;
    right: 1rem;
  }

  .grade-tabs {
    width: 100%;
    justify-content: center;
  }

  .grade-tab {
    padding: 0.35rem 0.6rem;
    font-size: 0.82rem;
  }

  .page-title {
    font-size: 1.5rem;
  }

  .page-subtitle {
    font-size: 0.9rem;
    margin-bottom: 1.1rem;
  }

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

  .quote-strip {
    flex-direction: column;
    align-items: center;
    gap: 0.2rem;
    text-align: center;
  }

  .buttons-fixed {
    bottom: 1rem;
    right: 1rem;
  }

  table {
    font-size: 0.75rem;
  }
}

@media (max-width: 400px) {
  .container {
    padding: 0 0.75rem;
  }

  .grade-tab {
    padding: 0.3rem 0.5rem;
    font-size: 0.78rem;
  }
}

/* --- Print Styles --- */
@media print {
  .site-header,
  .buttons-fixed,
  .site-footer {
    display: none !important;
  }

  body {
    background: white;
    color: black;
  }

  .card {
    box-shadow: none;
    border: 1px solid #ccc;
  }
}