/* =====================================================
   URANIUM ISOTOPE MAP · premium, apple-ish, nuclear
   ===================================================== */

:root {
  --bg: #06080d;
  --bg-2: #0a0d15;
  --panel: rgba(18, 22, 33, 0.6);
  --panel-strong: rgba(22, 26, 38, 0.85);
  --panel-2: rgba(28, 33, 48, 0.4);

  --border: rgba(130, 150, 190, 0.12);
  --border-strong: rgba(130, 150, 190, 0.28);
  --border-accent: rgba(124, 249, 197, 0.35);

  --text: #eef1f8;
  --text-dim: #99a2b6;
  --text-faint: #5d6578;

  --accent: #7cf9c5;
  --accent-2: #9d7bff;
  --alpha: #ff8a4a;
  --beta-m: #4ea9ff;
  --beta-p: #c77bff;
  --danger: #ff4e7c;
  --warn: #ffcf4a;

  --radius: 14px;
  --radius-lg: 22px;
  --radius-xl: 28px;

  --shadow-soft: 0 8px 32px -8px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 30px 80px -30px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 60px rgba(124, 249, 197, 0.12);

  --mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, monospace;
  --sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

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

html, body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

body {
  min-height: 100vh;
  background:
    radial-gradient(ellipse 80% 60% at 50% 0%, rgba(124, 249, 197, 0.06), transparent 70%),
    radial-gradient(ellipse 80% 60% at 90% 30%, rgba(157, 123, 255, 0.05), transparent 70%),
    var(--bg);
}

/* ====== BG DECOR ====== */
.bg-grid {
  position: fixed; inset: 0;
  background-image:
    linear-gradient(rgba(130,150,190,0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(130,150,190,0.035) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at center, #000 0%, transparent 75%);
  pointer-events: none;
  z-index: 0;
}
.bg-glow {
  position: fixed;
  top: -200px; left: 50%;
  width: 1100px; height: 1100px;
  transform: translateX(-50%);
  background: radial-gradient(circle, rgba(124,249,197,0.07), transparent 60%);
  pointer-events: none;
  z-index: 0;
  filter: blur(20px);
}

/* ====== HERO ====== */
.hero {
  position: relative;
  z-index: 1;
  max-width: 1100px;
  margin: 0 auto;
  padding: 110px 28px 80px;
  text-align: center;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 7px 16px;
  border: 1px solid var(--border-strong);
  border-radius: 100px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--text-dim);
  background: var(--panel);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  margin-bottom: 32px;
  font-weight: 500;
}
.badge .dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent);
  animation: pulse 2.2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.45; transform: scale(0.75); }
}

.hero h1 {
  font-size: clamp(2.5rem, 6.5vw, 5rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.02;
  margin-bottom: 28px;
}
.accent {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.subtitle {
  font-size: clamp(1.05rem, 1.6vw, 1.25rem);
  color: var(--text-dim);
  max-width: 640px;
  margin: 0 auto 48px;
  line-height: 1.55;
  font-weight: 400;
}

.hero-stats {
  display: inline-flex;
  align-items: center;
  gap: 28px;
  padding: 18px 36px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 100px;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}
.hero-stats > div:not(.divider) {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}
.hero-stats b {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  font-family: var(--mono);
}
.hero-stats b sup { font-size: 0.65em; }
.hero-stats span {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--text-faint);
  font-weight: 500;
}
.hero-stats .divider {
  width: 1px;
  height: 28px;
  background: var(--border-strong);
}

@media (max-width: 640px) {
  .hero-stats { padding: 14px 20px; gap: 16px; border-radius: 18px; flex-wrap: wrap; justify-content: center; }
  .hero-stats .divider { display: none; }
}

/* ====== SECTIONS ====== */
.section {
  position: relative;
  z-index: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 100px 28px;
}

.section-head {
  margin-bottom: 56px;
  text-align: center;
}
.step {
  display: inline-block;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent);
  letter-spacing: 0.25em;
  padding: 5px 12px;
  border: 1px solid var(--border-accent);
  border-radius: 100px;
  margin-bottom: 20px;
  background: rgba(124, 249, 197, 0.05);
  text-transform: uppercase;
}
.section-head h2 {
  font-size: clamp(1.9rem, 4vw, 2.6rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 14px;
  line-height: 1.15;
}
.section-head p {
  color: var(--text-dim);
  font-size: 1rem;
  max-width: 640px;
  margin: 0 auto;
}

/* ====== TIMELINE ====== */
.timeline {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0;
  position: relative;
  padding: 40px 0;
}
.timeline::before {
  content: '';
  position: absolute;
  top: 58px; left: 10%; right: 10%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-strong), var(--border-strong), transparent);
}
.tl-item {
  padding: 0 14px;
  text-align: center;
  position: relative;
}
.tl-year {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.1em;
  margin-bottom: 18px;
  text-transform: uppercase;
}
.tl-dot {
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
  margin: 0 auto 24px;
  position: relative;
  z-index: 1;
}
.tl-dot.live {
  background: var(--accent);
  box-shadow: 0 0 16px var(--accent);
  animation: pulse 2s infinite;
}
.tl-body h4 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text);
  letter-spacing: -0.01em;
}
.tl-body p {
  font-size: 13px;
  color: var(--text-dim);
  line-height: 1.5;
}

@media (max-width: 900px) {
  .timeline {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 20px 0;
  }
  .timeline::before {
    top: 0; bottom: 0; left: 20px; right: auto;
    width: 1px;
    height: auto;
    background: linear-gradient(180deg, transparent, var(--border-strong), var(--border-strong), transparent);
  }
  .tl-item {
    padding-left: 56px;
    padding-right: 0;
    text-align: left;
  }
  .tl-year {
    position: absolute;
    top: -4px;
    left: 56px;
    margin-bottom: 0;
  }
  .tl-dot {
    position: absolute;
    top: 2px;
    left: 14px;
    margin: 0;
  }
  .tl-body { padding-top: 28px; }
}

/* ====== NUCLIDE CHART ====== */
.chart-panel {
  padding: 36px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.chart-axes {
  display: flex;
  gap: 18px;
  align-items: stretch;
}

.axis-y {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 0 10px 28px;
  border-right: 1px solid var(--border);
  min-width: 48px;
}
.axis-y .axis-label {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-faint);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 8px;
}
.axis-y .axis-value {
  font-family: var(--mono);
  font-size: 28px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.02em;
}

.chart-scroll {
  flex: 1;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
  padding-bottom: 4px;
}
.chart-scroll::-webkit-scrollbar { height: 6px; }
.chart-scroll::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 100px; }

.chart-grid {
  display: grid;
  grid-template-columns: repeat(26, minmax(42px, 1fr));
  gap: 6px;
  min-width: 100%;
}

.cell {
  aspect-ratio: 1;
  position: relative;
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
  transition: transform 0.2s, border-color 0.2s, box-shadow 0.3s;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--text);
  overflow: hidden;
}
.cell::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--cell-color, transparent);
  opacity: var(--cell-opacity, 0.2);
  transition: opacity 0.3s;
  z-index: 0;
}
.cell span {
  position: relative;
  z-index: 1;
  text-shadow: 0 1px 2px rgba(0,0,0,0.5);
}
.cell:hover {
  transform: translateY(-3px) scale(1.05);
  border-color: rgba(255,255,255,0.3);
  box-shadow: 0 8px 24px -8px var(--cell-color, rgba(124,249,197,0.4));
  z-index: 2;
}
.cell:hover::before {
  opacity: calc(var(--cell-opacity, 0.2) + 0.3);
}
.cell.active {
  border-color: #fff;
  box-shadow: 0 0 0 2px var(--accent), 0 8px 30px -8px var(--cell-color, rgba(124,249,197,0.6));
  transform: translateY(-3px) scale(1.08);
  z-index: 3;
}
.cell.active::before { opacity: calc(var(--cell-opacity, 0.2) + 0.45); }

.axis-x {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 16px;
  padding: 0 4px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-faint);
}
.axis-x .axis-label {
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.chart-legend {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}
.chart-legend span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text-dim);
  font-family: var(--mono);
}
.chart-legend i {
  width: 12px; height: 12px;
  border-radius: 4px;
  display: inline-block;
}
.chart-legend .legend-sep {
  width: 1px; height: 14px;
  background: var(--border-strong);
  margin: 0 6px;
}
.chart-legend .legend-note {
  color: var(--text-faint);
  font-style: italic;
  letter-spacing: 0;
}

/* TOOLTIP */
.chart-tooltip {
  position: fixed;
  pointer-events: none;
  background: rgba(8, 11, 18, 0.96);
  border: 1px solid var(--border-strong);
  border-radius: 14px;
  padding: 18px 20px;
  font-size: 13px;
  color: var(--text);
  z-index: 1000;
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  opacity: 0;
  transform: translateY(6px) scale(0.96);
  transition: opacity 0.18s ease, transform 0.18s ease;
  box-shadow:
    0 24px 60px -20px rgba(0, 0, 0, 0.7),
    0 0 0 1px var(--tt-color, rgba(124, 249, 197, 0.2));
  min-width: 240px;
  max-width: 280px;
}
.chart-tooltip.visible {
  opacity: 1;
  transform: translateY(0) scale(1);
}
.chart-tooltip::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--tt-color, var(--accent));
  border-radius: 14px 14px 0 0;
  opacity: 0.9;
}
.tt-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}
.tt-title {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 20px;
  color: var(--tt-color, var(--accent));
  letter-spacing: -0.02em;
  line-height: 1;
}
.tt-decay-chip {
  display: inline-flex;
  align-items: center;
  padding: 3px 9px;
  border-radius: 100px;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  background: var(--tt-color-soft, rgba(124, 249, 197, 0.1));
  color: var(--tt-color, var(--accent));
  border: 1px solid var(--tt-color, var(--accent));
  letter-spacing: 0.02em;
}
.chart-tooltip .tt-row {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  padding: 5px 0;
  align-items: baseline;
}
.chart-tooltip .tt-k {
  color: var(--text-faint);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-weight: 500;
}
.chart-tooltip .tt-v {
  color: var(--text);
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 600;
  text-align: right;
}
.tt-v-accent { color: var(--tt-color, var(--accent)) !important; }
.tt-footer {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed var(--border);
  font-size: 11.5px;
  color: var(--text-dim);
  line-height: 1.55;
  font-family: var(--sans);
  font-weight: 400;
  letter-spacing: 0;
  text-transform: none;
}
.tt-hint {
  margin-top: 10px;
  font-size: 10px;
  color: var(--text-faint);
  text-align: center;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-family: var(--mono);
  font-weight: 500;
}

@media (max-width: 500px) {
  .chart-tooltip {
    min-width: 200px;
    max-width: 240px;
    padding: 14px 16px;
  }
  .tt-title { font-size: 18px; }
}

/* ====== EXPLORER (SLIDER + BIG CARD + MATTERS) ====== */
.slider-wrap {
  max-width: 900px;
  margin: 0 auto 48px;
  padding: 24px 30px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}
.slider-labels {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 14px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text-faint);
  letter-spacing: 0.05em;
}
.slider-labels b {
  color: var(--text-dim);
  font-weight: 600;
}
.slider-labels .slider-current {
  font-size: 18px;
  color: var(--accent);
  letter-spacing: -0.01em;
}
.slider-labels .slider-current b {
  color: var(--accent);
  font-weight: 700;
  font-size: 22px;
}

input[type="range"] {
  width: 100%;
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  background: linear-gradient(90deg, var(--alpha), var(--beta-m), var(--accent), var(--beta-p));
  background-size: 100% 100%;
  border-radius: 100px;
  outline: none;
  cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: #fff;
  cursor: pointer;
  box-shadow: 0 0 0 3px var(--bg), 0 0 0 4px var(--accent), 0 4px 18px rgba(124,249,197,0.5);
  transition: transform 0.15s;
}
input[type="range"]::-webkit-slider-thumb:hover { transform: scale(1.15); }
input[type="range"]::-moz-range-thumb {
  width: 18px; height: 18px;
  border-radius: 50%;
  background: #fff;
  cursor: pointer;
  border: 3px solid var(--accent);
}

.explorer-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 24px;
  align-items: stretch;
}
@media (max-width: 900px) {
  .explorer-grid { grid-template-columns: 1fr; }
}

.iso-card-big {
  padding: 36px;
  background: var(--panel-strong);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  gap: 28px;
  position: relative;
  overflow: hidden;
}
.iso-card-big::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--cell-color, var(--accent)), transparent);
  opacity: 0.8;
  transition: background 0.4s;
}
.iso-card-big::after {
  content: '';
  position: absolute;
  top: -100px; right: -100px;
  width: 300px; height: 300px;
  background: radial-gradient(circle, var(--cell-color, var(--accent)), transparent 70%);
  opacity: 0.08;
  pointer-events: none;
  transition: background 0.4s;
}

.iso-card-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  flex-wrap: wrap;
}

.iso-symbol .nuclide.big {
  font-size: 64px;
  letter-spacing: -0.03em;
  font-weight: 700;
}
.iso-symbol .nuclide.big .nums {
  font-size: 0.45em;
  gap: 2px;
  margin-right: 4px;
}

.iso-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: flex-end;
  align-items: flex-start;
}
.iso-tag {
  display: inline-flex;
  align-items: center;
  padding: 5px 12px;
  border-radius: 100px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border-strong);
  color: var(--text-dim);
}
.iso-tag.natural { color: var(--accent); border-color: var(--border-accent); background: rgba(124,249,197,0.08); }
.iso-tag.fissile { color: var(--warn); border-color: rgba(255,207,74,0.3); background: rgba(255,207,74,0.08); }
.iso-tag.artificial { color: var(--accent-2); border-color: rgba(157,123,255,0.3); background: rgba(157,123,255,0.08); }
.iso-tag.trace { color: var(--beta-m); border-color: rgba(78,169,255,0.3); background: rgba(78,169,255,0.08); }

/* NUCLIDE NOTATION */
.nuclide {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  font-family: var(--mono);
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
}
.nuclide .nums {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-end;
  justify-content: center;
  line-height: 1;
  font-size: 0.62em;
  color: var(--text-dim);
  gap: 1px;
}
.nuclide .nums sup {
  display: block;
  color: var(--accent);
  line-height: 1;
}
.nuclide .nums sub {
  display: block;
  color: var(--accent-2);
  line-height: 1;
}

.iso-stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}
@media (max-width: 500px) {
  .iso-stats-grid { grid-template-columns: repeat(2, 1fr); }
}
.stat-cell {
  padding: 14px 16px;
  background: rgba(0,0,0,0.25);
  border: 1px solid var(--border);
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.stat-k {
  font-size: 10px;
  color: var(--text-faint);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 500;
}
.stat-v {
  font-family: var(--mono);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
}

.halflife-block {
  padding: 20px;
  background: rgba(0,0,0,0.25);
  border: 1px solid var(--border);
  border-radius: 14px;
}
.hl-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 14px;
  gap: 12px;
  flex-wrap: wrap;
}
.hl-head span {
  font-size: 11px;
  color: var(--text-faint);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 500;
}
.hl-head b {
  font-family: var(--mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.01em;
}
.stability-bar {
  height: 6px;
  background: rgba(255,255,255,0.04);
  border-radius: 100px;
  overflow: hidden;
  margin-bottom: 10px;
}
.stability-fill {
  height: 100%;
  width: 50%;
  background: linear-gradient(90deg, var(--danger), var(--warn), var(--accent));
  border-radius: 100px;
  transition: width 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow: 0 0 12px rgba(124,249,197,0.4);
}
.hl-foot {
  display: flex;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 10px;
  color: var(--text-faint);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.hl-foot span:nth-child(2) {
  color: var(--text-dim);
  font-weight: 600;
}

.decay-line {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  padding: 16px 20px;
  background: rgba(124, 249, 197, 0.04);
  border: 1px solid var(--border-accent);
  border-radius: 12px;
}
.dl-k {
  font-size: 11px;
  color: var(--text-faint);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 500;
}
.dl-chip {
  display: inline-flex;
  align-items: center;
  padding: 5px 12px;
  border-radius: 100px;
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 600;
  background: rgba(255,138,74,0.12);
  color: var(--alpha);
  border: 1px solid rgba(255,138,74,0.3);
  transition: all 0.3s;
}
.dl-chip.beta-m { background: rgba(78,169,255,0.12); color: var(--beta-m); border-color: rgba(78,169,255,0.3); }
.dl-chip.beta-p { background: rgba(199,123,255,0.12); color: var(--beta-p); border-color: rgba(199,123,255,0.3); }
.dl-arrow {
  color: var(--text-faint);
  font-size: 18px;
  font-family: var(--mono);
}

/* ===== MATTERS CARD ===== */
.matters-card {
  padding: 32px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: var(--shadow-soft);
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.matters-card h3 {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
}
.matters-rows {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.mrow {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
  gap: 14px;
}
.mrow:last-child { border-bottom: none; }
.mrow-k {
  font-size: 12px;
  color: var(--text-faint);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-weight: 500;
  flex-shrink: 0;
}
.mrow-v {
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  text-align: right;
}
.mrow-v.yes { color: var(--accent); }
.mrow-v.no { color: var(--danger); }
.mrow-v.maybe { color: var(--warn); }

.matters-desc {
  margin-top: auto;
  padding: 16px;
  background: rgba(0,0,0,0.25);
  border-left: 2px solid var(--cell-color, var(--accent));
  border-radius: 0 10px 10px 0;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--text-dim);
  transition: border-color 0.4s;
}

/* ====== DECAY SIMULATOR ====== */
.decay-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 24px;
  align-items: stretch;
}
@media (max-width: 900px) {
  .decay-grid { grid-template-columns: 1fr; }
}

.decay-canvas-wrap {
  position: relative;
  padding: 28px;
  background: var(--panel-strong);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  min-height: 440px;
}
.decay-canvas-wrap canvas {
  width: 100%;
  height: 100%;
  display: block;
  position: absolute;
  inset: 0;
}

.decay-overlay {
  position: absolute;
  top: 24px; left: 24px; right: 24px;
  display: flex;
  justify-content: space-between;
  gap: 10px;
  z-index: 2;
  pointer-events: none;
  flex-wrap: wrap;
}
.d-stat {
  background: rgba(8, 10, 18, 0.75);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  padding: 10px 14px;
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 100px;
}
.d-stat span {
  font-size: 10px;
  color: var(--text-faint);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 500;
}
.d-stat b {
  font-family: var(--mono);
  font-size: 16px;
  font-weight: 700;
  color: var(--accent);
}

.decay-controls {
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding: 32px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.control-block label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 11px;
  color: var(--text-faint);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 14px;
  font-weight: 500;
}
.control-block label span {
  font-family: var(--mono);
  color: var(--accent);
  font-size: 13px;
  letter-spacing: 0;
  text-transform: none;
  font-weight: 700;
}
.speed-labels {
  display: flex;
  justify-content: space-between;
  font-size: 10px;
  color: var(--text-faint);
  margin-top: 8px;
  font-family: var(--mono);
  letter-spacing: 0.1em;
}

.formula-card {
  padding: 20px;
  background: rgba(0,0,0,0.3);
  border: 1px solid var(--border);
  border-radius: 14px;
}
.formula-main {
  font-family: var(--mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.01em;
  margin-bottom: 8px;
  text-align: center;
}
.formula-main sub { font-size: 0.6em; color: var(--text-dim); }
.formula-main sup { font-size: 0.7em; color: var(--accent); }
.formula-sub {
  font-size: 12px;
  color: var(--text-faint);
  text-align: center;
  font-family: var(--mono);
  margin-bottom: 14px;
  padding-bottom: 14px;
  border-bottom: 1px dashed var(--border-strong);
}
.formula-current {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 12px;
  color: var(--text-dim);
}
.formula-current b { color: var(--text); font-family: var(--mono); }
.formula-current .mono { font-family: var(--mono); color: var(--accent); }

/* EXTREMES */
.extremes-block h4 {
  font-size: 11px;
  color: var(--text-faint);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 500;
  margin-bottom: 12px;
}
.extremes-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
@media (max-width: 480px) {
  .extremes-row { grid-template-columns: 1fr; }
}
.extreme-btn {
  padding: 14px 16px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 4px;
  color: var(--text);
}
.extreme-btn:hover {
  transform: translateY(-2px);
  border-color: var(--border-strong);
  box-shadow: 0 8px 24px -8px rgba(0,0,0,0.5);
}
.extreme-btn.longest:hover { border-color: var(--accent); box-shadow: 0 8px 24px -8px rgba(124,249,197,0.4); }
.extreme-btn.shortest:hover { border-color: var(--danger); box-shadow: 0 8px 24px -8px rgba(255,78,124,0.4); }
.ex-label {
  font-size: 10px;
  color: var(--text-faint);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 500;
}
.ex-value {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.01em;
}
.extreme-btn.longest .ex-value { color: var(--accent); }
.extreme-btn.shortest .ex-value { color: var(--danger); }

/* ====== FOOTER ====== */
footer {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 40px 20px 80px;
  color: var(--text-faint);
  font-size: 12px;
  font-family: var(--mono);
  letter-spacing: 0.05em;
}

/* ====== RESPONSIVE ====== */
@media (max-width: 720px) {
  .section { padding: 70px 20px; }
  .hero { padding: 80px 20px 60px; }
  .iso-card-big, .matters-card, .decay-controls { padding: 24px; }
  .decay-canvas-wrap { padding: 20px; min-height: 360px; }
  .chart-panel { padding: 24px 18px; }
  .chart-grid { grid-template-columns: repeat(26, 42px); }
  .iso-symbol .nuclide.big { font-size: 48px; }
  .decay-overlay { top: 14px; left: 14px; right: 14px; gap: 6px; }
  .d-stat { padding: 8px 12px; min-width: 88px; }
  .d-stat b { font-size: 14px; }
}

/* ====== TEORIE (resurse PULS) ====== */
.theory-embed .theory-list {
  max-width: 720px;
  margin: 0 auto 1rem;
  padding-left: 1.25rem;
  color: var(--text-dim);
  line-height: 1.65;
}
.theory-embed .theory-list li { margin-bottom: 0.65rem; }
.theory-mono {
  font-family: var(--mono);
  font-size: 0.95em;
  color: var(--text);
}
.theory-more {
  text-align: center;
  margin-top: 1.25rem;
  font-size: 14px;
}
.theory-more a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(124, 249, 197, 0.35);
}
.theory-more a:hover { color: var(--text); border-bottom-color: var(--accent); }