/* Quantum Atlas — таблица Менделеева.
   Сетка таблицы прежняя, оформление синхронизировано с разделом /particles/. */

:root {
  --active-color: #6ab6ff;
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #f6f8ff;
  background: #030711;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
}

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

body {
  min-height: 100vh;
  background: #030711;
  overflow-x: hidden;
}

button, a { font: inherit; }

button:focus-visible, a:focus-visible {
  outline: 2px solid var(--active-color);
  outline-offset: 2px;
}

.background-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  opacity: .55;
}

.app-shell {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  background:
    radial-gradient(circle at 50% 22%, color-mix(in srgb, var(--active-color) 10%, transparent), transparent 42%),
    linear-gradient(180deg, rgba(3, 7, 17, .72), rgba(3, 7, 17, .92));
}

.atlas-ui {
  max-width: 1560px;
  margin: 0 auto;
  padding: 20px 24px 40px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* ---------- верхняя панель ---------- */

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  min-height: 54px;
}

.brand-lockup { display: flex; align-items: center; gap: 12px; }

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border: 1px solid color-mix(in srgb, var(--active-color) 60%, transparent);
  border-radius: 14px;
  color: var(--active-color);
  background: color-mix(in srgb, var(--active-color) 10%, rgba(8, 14, 28, .88));
  box-shadow: 0 0 24px color-mix(in srgb, var(--active-color) 18%, transparent);
}

.eyebrow {
  color: #8391ac;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: .15em;
  text-transform: uppercase;
}

.brand-title { margin-top: 2px; font-size: 18px; font-weight: 740; letter-spacing: -.02em; }

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

.ghost-btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 9px 13px;
  border: 1px solid rgba(255, 255, 255, .09);
  border-radius: 11px;
  color: #a9b6cd;
  background: rgba(8, 14, 27, .72);
  backdrop-filter: blur(18px);
  text-decoration: none;
  font-size: 11px;
  font-weight: 720;
  transition: .18s ease;
}

.ghost-btn:hover {
  color: #fff;
  border-color: color-mix(in srgb, var(--active-color) 38%, transparent);
  background: color-mix(in srgb, var(--active-color) 12%, rgba(8, 14, 27, .8));
}

/* ---------- вкладки категорий ---------- */

.category-tabs {
  display: flex;
  gap: 7px;
  align-items: center;
  padding: 6px;
  border: 1px solid rgba(255, 255, 255, .075);
  border-radius: 15px;
  background: rgba(8, 14, 27, .72);
  backdrop-filter: blur(18px);
  overflow-x: auto;
  scrollbar-width: none;
}

.category-tabs::-webkit-scrollbar { display: none; }

.category-tab {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 7px;
  min-height: 40px;
  padding: 8px 13px;
  border: 1px solid transparent;
  border-radius: 11px;
  color: #8f9db8;
  background: transparent;
  cursor: pointer;
  transition: .18s ease;
}

.category-tab:hover { color: #eef3ff; background: rgba(255, 255, 255, .05); }

.category-tab.active {
  color: #fff;
  border-color: color-mix(in srgb, var(--tab-color, var(--active-color)) 32%, transparent);
  background: color-mix(in srgb, var(--tab-color, var(--active-color)) 14%, rgba(255, 255, 255, .025));
}

.category-tab i {
  width: 8px;
  height: 8px;
  border-radius: 99px;
  background: var(--tab-color, var(--active-color));
  box-shadow: 0 0 10px var(--tab-color, var(--active-color));
}

.category-tab span { font-size: 12px; font-weight: 720; white-space: nowrap; }
.category-tab small { color: #a9b6cd; font-size: 9px; }

/* ---------- панель с таблицей ---------- */

.table-panel {
  padding: 18px;
  border: 1px solid rgba(255, 255, 255, .085);
  border-radius: 20px;
  background: rgba(8, 14, 27, .7);
  backdrop-filter: blur(22px);
  box-shadow: 0 24px 70px rgba(0, 0, 0, .28);
}

.panel-heading {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 16px;
}

.panel-heading h1 { margin-top: 4px; font-size: 22px; font-weight: 760; letter-spacing: -.03em; }
.panel-hint { color: #a9b6cd; font-size: 10px; font-weight: 700; letter-spacing: .04em; }

.table-scroll { overflow-x: auto; padding-bottom: 6px; }
.table-scroll::-webkit-scrollbar { height: 6px; }
.table-scroll::-webkit-scrollbar-thumb { background: rgba(255, 255, 255, .14); border-radius: 99px; }

/* ---------- сетка таблицы ---------- */

.periodic-table {
  --cell: clamp(38px, calc((100vw - 110px) / 18 - 5px), 74px);
  display: grid;
  grid-template-columns: repeat(18, var(--cell));
  gap: 5px;
  justify-content: center;
  min-width: min-content;
  margin: 0 auto;
}

.element-box {
  position: relative;
  width: var(--cell);
  height: calc(var(--cell) * 1.16);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 4px 3px;
  border: 1px solid rgba(255, 255, 255, .07);
  border-radius: 10px;
  background: rgba(255, 255, 255, .022);
  color: #46536b;
  text-decoration: none;
  opacity: 0;
  animation: popIn .5s cubic-bezier(.175, .885, .32, 1.275) forwards;
  transition: transform .18s ease, background .18s ease, border-color .18s ease, box-shadow .18s ease, opacity .18s ease;
}

.element-box::after {
  content: "";
  position: absolute;
  inset: auto 10px 3px;
  height: 2px;
  border-radius: 99px;
  background: var(--element-color, transparent);
  opacity: .55;
}

@keyframes popIn {
  0% { opacity: 0; transform: translateY(18px) scale(.9); }
  100% { opacity: 1; transform: translateY(0) scale(1); }
}

.element-box.active {
  color: #dbe3f3;
  cursor: pointer;
}

.element-box.active:hover {
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--element-color) 55%, transparent);
  background: color-mix(in srgb, var(--element-color) 13%, rgba(255, 255, 255, .03));
  box-shadow: 0 12px 26px rgba(0, 0, 0, .45), 0 0 18px color-mix(in srgb, var(--element-color) 28%, transparent);
  z-index: 5;
}

.element-box.dimmed { opacity: .2; }

.element-box.empty { visibility: hidden; }

.el-number {
  align-self: flex-start;
  color: #a9b6cd;
  font-size: 8px;
  font-weight: 700;
  line-height: 1;
}

.el-symbol {
  margin: auto 0 2px;
  color: var(--element-color, #dbe3f3);
  font-size: calc(var(--cell) * .3);
  font-weight: 780;
  line-height: 1;
  letter-spacing: -.02em;
}

.el-name {
  width: 100%;
  color: #9eabc1;
  font-size: 8px;
  line-height: 1.1;
  text-align: center;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.el-mass {
  width: 100%;
  margin-bottom: 3px;
  color: #a9b6cd;
  font-size: 8px;
  line-height: 1.1;
  text-align: center;
}

@media (max-width: 1100px) {
  .el-name, .el-mass { display: none; }
  .element-box { justify-content: center; }
  .el-symbol { margin: auto 0; font-size: calc(var(--cell) * .36); }
  .ghost-btn .btn-text { display: none; }
}

@media (max-width: 720px) {
  .atlas-ui { padding: 14px 12px 28px; }
  .topbar { flex-wrap: wrap; }
  .topbar-actions { width: 100%; min-width: 0; flex-wrap: wrap; justify-content: flex-start; }
  .table-panel { padding: 12px; }
  .panel-heading { flex-direction: column; align-items: flex-start; gap: 6px; }
  .panel-heading h1 { font-size: 18px; }
  .periodic-table { --cell: 44px; justify-content: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  .element-box { animation: none; opacity: 1; }
  *, *::before, *::after { transition-duration: .01ms !important; }
}