/* ===================================
   SOLARWATCH — GLOBAL STYLES
   =================================== */

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

:root {
  --bg:         #0A0C0F;
  --bg2:        #0F1217;
  --bg3:        #161B22;
  --surface:    #1A2030;
  --surface2:   #222A3A;
  --border:     rgba(255,255,255,0.07);
  --border2:    rgba(255,255,255,0.12);
  --gold:       #F4B942;
  --gold-dim:   rgba(244,185,66,0.15);
  --gold-glow:  rgba(244,185,66,0.08);
  --green:      #4ADE80;
  --green-dim:  rgba(74,222,128,0.12);
  --red:        #F87171;
  --blue:       #60A5FA;
  --text:       #E8EDF5;
  --text2:      #8A95A8;
  --text3:      #4E5A6E;
  --radius:     12px;
  --radius-lg:  20px;
  --font-head:  'Syne', sans-serif;
  --font-body:  'DM Mono', monospace;
  --font-serif: 'Instrument Serif', serif;
  --max-w:      1200px;
  --transition: 0.3s cubic-bezier(0.4,0,0.2,1);
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 14px;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

/* ===================================
   SCROLLBAR
   =================================== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--surface2); border-radius: 3px; }

/* ===================================
   TYPOGRAPHY
   =================================== */
h1, h2, h3, h4 {
  font-family: var(--font-head);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

em { font-family: var(--font-serif); font-style: italic; color: var(--gold); }

/* ===================================
   BUTTONS
   =================================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 8px;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.02em;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  white-space: nowrap;
}
.btn-primary {
  background: var(--gold);
  color: #0A0C0F;
  font-weight: 600;
}
.btn-primary:hover {
  background: #f7c95a;
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(244,185,66,0.3);
}
.btn-ghost {
  background: transparent;
  color: var(--text2);
  border: 1px solid var(--border2);
}
.btn-ghost:hover {
  background: var(--surface);
  color: var(--text);
  border-color: var(--border2);
}

/* ===================================
   NAVIGATION
   =================================== */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 0 2rem;
  background: transparent;
  transition: background 0.4s, box-shadow 0.4s;
}
.nav.scrolled {
  background: rgba(10,12,15,0.92);
  backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 var(--border);
}
.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text);
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}
.nav-link {
  font-size: 13px;
  color: var(--text2);
  transition: color var(--transition);
}
.nav-link:hover { color: var(--text); }
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: var(--transition);
}

/* ===================================
   HERO
   =================================== */
.hero {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr auto;
  align-items: center;
  gap: 0;
  padding: 100px 2rem 0;
  max-width: var(--max-w);
  margin: 0 auto;
  position: relative;
}
.hero-grid-bg {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(244,185,66,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(244,185,66,0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  z-index: -1;
}
.hero-content {
  padding-right: 3rem;
  animation: fadeUp 0.9s cubic-bezier(0.4,0,0.2,1) both;
}
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(32px); }
  to   { opacity: 1; transform: translateY(0); }
}
.hero-label {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 1.2rem;
  display: flex;
  align-items: center;
  gap: 8px;
}
.hero-label::before {
  content: '';
  display: inline-block;
  width: 24px;
  height: 1px;
  background: var(--gold);
}
.hero-title {
  font-size: clamp(2.4rem, 4vw, 3.8rem);
  font-weight: 800;
  color: var(--text);
  margin-bottom: 1.4rem;
  line-height: 1.08;
}
.hero-sub {
  color: var(--text2);
  font-size: 14px;
  line-height: 1.7;
  max-width: 480px;
  margin-bottom: 2.4rem;
}
.hero-cta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  animation: fadeUp 1.1s 0.2s cubic-bezier(0.4,0,0.2,1) both;
}
.hero-orb {
  position: absolute;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(244,185,66,0.12) 0%, transparent 70%);
  pointer-events: none;
}
#heroCanvas {
  max-width: 100%;
  height: auto;
}

.hero-stats {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--border);
  margin-top: 3rem;
  padding-bottom: 3rem;
  animation: fadeUp 1.1s 0.4s cubic-bezier(0.4,0,0.2,1) both;
}
.hero-stat {
  padding: 2rem;
  border-right: 1px solid var(--border);
  position: relative;
}
.hero-stat:last-child { border-right: none; }
.hero-stat p {
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text3);
  margin-top: 4px;
}
.stat-val {
  font-family: var(--font-head);
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--text);
}
.stat-unit {
  font-family: var(--font-head);
  font-size: 1.2rem;
  color: var(--gold);
  margin-left: 4px;
}

/* ===================================
   SECTIONS
   =================================== */
.section {
  padding: 100px 2rem;
}
.section-dark {
  background: var(--bg2);
}
.container {
  max-width: var(--max-w);
  margin: 0 auto;
}
.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 4rem;
}
.section-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 1rem;
}
.section-title {
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  font-weight: 700;
  margin-bottom: 1rem;
}
.section-desc {
  color: var(--text2);
  font-size: 14px;
  line-height: 1.75;
}

/* ===================================
   FLOW DIAGRAM
   =================================== */
.flow-diagram {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  flex-wrap: wrap;
  row-gap: 2rem;
}
.flow-step {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem 1.4rem;
  width: 170px;
  flex-shrink: 0;
  text-align: center;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.flow-step::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gold-glow);
  opacity: 0;
  transition: var(--transition);
}
.flow-step:hover { border-color: rgba(244,185,66,0.35); transform: translateY(-4px); }
.flow-step:hover::before { opacity: 1; }
.flow-icon {
  width: 52px;
  height: 52px;
  margin: 0 auto 1rem;
  color: var(--gold);
}
.flow-icon svg { width: 100%; height: 100%; }
.flow-step h3 {
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text);
}
.flow-step p {
  font-size: 11px;
  color: var(--text2);
  line-height: 1.6;
}

.flow-arrow {
  flex-shrink: 0;
  width: 60px;
  display: flex;
  align-items: center;
  position: relative;
}
.flow-arrow svg { width: 100%; }

@keyframes flowMove {
  0%   { transform: translateX(0); opacity: 0; }
  20%  { opacity: 1; }
  80%  { opacity: 1; }
  100% { transform: translateX(52px); opacity: 0; }
}
.flow-dot { animation: flowMove 2s infinite ease-in-out; }
.dot2 { animation-delay: 1s; }

/* ===================================
   COMPONENTS GRID
   =================================== */
.components-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.comp-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.8rem;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.comp-card::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
  opacity: 0;
  transition: var(--transition);
}
.comp-card:hover { border-color: var(--border2); transform: translateY(-3px); }
.comp-card:hover::after { opacity: 1; }

.comp-card-header {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.4rem;
}
.comp-icon {
  width: 44px;
  height: 44px;
  background: var(--gold-dim);
  border-radius: 10px;
  padding: 10px;
  flex-shrink: 0;
  color: var(--gold);
}
.comp-icon svg { width: 100%; height: 100%; }
.comp-card-header h3 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 4px;
  color: var(--text);
}
.comp-status {
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 2px 8px;
  border-radius: 20px;
  font-weight: 600;
}
.comp-status--active { background: rgba(74,222,128,0.12); color: var(--green); }
.comp-status--charging { background: rgba(244,185,66,0.15); color: var(--gold); }
.comp-status--standby { background: rgba(96,165,250,0.12); color: var(--blue); }

.comp-metrics {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.8rem;
  margin-bottom: 1.2rem;
  padding: 1rem;
  background: var(--bg);
  border-radius: 8px;
  border: 1px solid var(--border);
}
.comp-metric {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.comp-metric span {
  font-size: 10px;
  color: var(--text3);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.comp-metric strong {
  font-size: 11px;
  color: var(--text);
  font-weight: 500;
}
.comp-desc {
  font-size: 12px;
  color: var(--text2);
  line-height: 1.7;
}

/* ===================================
   SIMULATION
   =================================== */
.sim-layout {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 2rem;
  align-items: start;
}
.sim-controls {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.8rem;
  position: sticky;
  top: 88px;
}
.sim-panel-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 1.8rem;
  display: flex;
  align-items: center;
  gap: 8px;
}
.ctrl-group {
  margin-bottom: 1.6rem;
}
.ctrl-group label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--text2);
  margin-bottom: 8px;
}
.ctrl-val {
  color: var(--gold);
  font-weight: 500;
}
.ctrl-slider {
  width: 100%;
  -webkit-appearance: none;
  appearance: none;
  height: 4px;
  border-radius: 2px;
  background: var(--surface2);
  outline: none;
  cursor: pointer;
}
.ctrl-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--gold);
  cursor: pointer;
  box-shadow: 0 0 0 3px rgba(244,185,66,0.2);
  transition: box-shadow 0.2s;
}
.ctrl-slider::-webkit-slider-thumb:hover {
  box-shadow: 0 0 0 5px rgba(244,185,66,0.3);
}
.ctrl-hint {
  font-size: 10px;
  color: var(--text3);
  margin-top: 6px;
}

.sim-toggles {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 1rem 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  margin-top: 0.5rem;
}
.sim-toggle {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  font-size: 12px;
  color: var(--text2);
}
.toggle-switch {
  width: 36px;
  height: 20px;
  border-radius: 10px;
  background: var(--surface2);
  position: relative;
  transition: background 0.25s;
  flex-shrink: 0;
}
.toggle-switch::after {
  content: '';
  position: absolute;
  top: 3px; left: 3px;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--text3);
  transition: var(--transition);
}
.toggle-switch.active {
  background: var(--gold-dim);
  border: 1px solid rgba(244,185,66,0.3);
}
.toggle-switch.active::after {
  background: var(--gold);
  transform: translateX(16px);
}

/* Sim display */
.sim-display {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  overflow: hidden;
}

/* ---- FLOWCHART: simple flex row, nodes + wires alternate ---- */
.sim-flowchart {
  display: flex;
  flex-direction: row;
  align-items: center;
  width: 100%;
  margin-bottom: 2rem;
  gap: 0;
  overflow-x: auto;
  padding-bottom: 4px;
}

/* Each node takes equal space, never shrinks below a min */
.sim-node {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1rem;
  flex: 1 1 0;
  min-width: 110px;
  max-width: 160px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.sim-node::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--gold);
  opacity: 0;
  transition: opacity 0.3s;
}
.sim-node:hover { border-color: rgba(244,185,66,0.3); }
.sim-node.active { border-color: var(--gold); box-shadow: 0 0 0 3px rgba(244,185,66,0.1); }
.sim-node.active::before { opacity: 1; }

.sim-node-icon {
  width: 32px;
  height: 32px;
  color: var(--gold);
  margin-bottom: 10px;
  flex-shrink: 0;
}
.sim-node-icon svg { width: 100%; height: 100%; }

.sim-node-label {
  display: block;
  font-size: 9px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text3);
  margin-bottom: 3px;
  white-space: nowrap;
}
.sim-node-val {
  display: block;
  font-size: 17px;
  font-family: var(--font-head);
  font-weight: 700;
  color: var(--gold);
  white-space: nowrap;
}

/* Battery node extras */
.sim-node-battery { min-width: 130px; }
.battery-bar-wrap {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 8px;
  width: 100%;
}
.battery-bar {
  flex: 1;
  height: 6px;
  background: var(--surface2);
  border-radius: 3px;
  overflow: hidden;
  min-width: 40px;
}
.battery-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--green), #86efac);
  border-radius: 3px;
  transition: width 0.8s cubic-bezier(0.4,0,0.2,1);
}
.battery-fill.low { background: linear-gradient(90deg, var(--red), #fca5a5); }
.battery-fill.mid { background: linear-gradient(90deg, var(--gold), #fcd34d); }
.battery-pct {
  font-size: 10px;
  font-weight: 600;
  color: var(--text2);
  white-space: nowrap;
}

/* ---- Wires between nodes ---- */
.sim-wire-h {
  flex: 0 0 32px;
  height: 2px;
  background: var(--border);
  position: relative;
  align-self: center;
  transition: background 0.4s;
  overflow: visible;
}
.sim-wire-h.active {
  background: linear-gradient(90deg, rgba(244,185,66,0.8), rgba(244,185,66,0.3));
}

/* Animated energy particle */
.ep {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 7px var(--gold);
  opacity: 0;
  pointer-events: none;
}
@keyframes travelH {
  0%   { left: -4px; opacity: 0; }
  15%  { opacity: 1; }
  85%  { opacity: 1; }
  100% { left: calc(100% + 4px); opacity: 0; }
}
.sim-wire-h.active .ep { animation: travelH 1.4s infinite ease-in-out; }

/* Sim output cards */
.sim-outputs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  border-top: 1px solid var(--border);
  padding-top: 1.5rem;
}
.sim-output-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.so-label {
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text3);
}
.so-val {
  font-size: 15px;
  font-family: var(--font-head);
  font-weight: 700;
  color: var(--text);
}

/* ===================================
   PERFORMANCE
   =================================== */
.chart-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0;
}
.chart-tab {
  background: none;
  border: none;
  padding: 10px 20px;
  font-family: var(--font-body);
  font-size: 12px;
  color: var(--text2);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: var(--transition);
  letter-spacing: 0.04em;
}
.chart-tab:hover { color: var(--text); }
.chart-tab.active { color: var(--gold); border-bottom-color: var(--gold); }

.chart-area {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-bottom: 2rem;
}
#perfChart { width: 100%; }

.perf-summary {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.2rem;
}
.perf-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.4rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  transition: var(--transition);
}
.perf-card:hover {
  border-color: var(--border2);
  transform: translateY(-2px);
}
.perf-card svg {
  color: var(--gold);
  flex-shrink: 0;
}
.perf-card div {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.perf-card strong {
  font-size: 12px;
  font-weight: 600;
  color: var(--text);
}
.perf-card span {
  font-size: 11px;
  color: var(--text2);
}

/* ===================================
   FOOTER
   =================================== */
.footer {
  background: var(--bg2);
  border-top: 1px solid var(--border);
  padding: 4rem 2rem 2rem;
}
.footer-top {
  max-width: var(--max-w);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2rem;
}
.footer-brand .nav-logo {
  margin-bottom: 1rem;
}
.footer-brand p {
  font-size: 12px;
  color: var(--text2);
  line-height: 1.7;
  max-width: 320px;
}
.footer-links h4 {
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text3);
  margin-bottom: 1rem;
}
.footer-links ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.footer-links ul li, .footer-links ul a {
  font-size: 13px;
  color: var(--text2);
  transition: color var(--transition);
}
.footer-links ul a:hover { color: var(--text); }
.footer-bottom {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}
.footer-bottom p {
  font-size: 11px;
  color: var(--text3);
}
.footer-tech {
  color: var(--gold) !important;
  opacity: 0.7;
}

/* ===================================
   SCROLL REVEAL
   =================================== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===================================
   RESPONSIVE
   =================================== */
@media (max-width: 1024px) {
  .hero {
    grid-template-columns: 1fr;
    text-align: center;
    padding-top: 120px;
  }
  .hero-content {
    padding-right: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
  }
  .hero-label::before { display: none; }
  .hero-visual { display: none; }
  .hero-stats { grid-column: 1; margin-top: 2rem; }

  .components-grid { grid-template-columns: repeat(2, 1fr); }
  .sim-layout { grid-template-columns: 1fr; }
  .sim-controls { position: static; }
  .sim-outputs { grid-template-columns: repeat(2, 1fr); }
  .perf-summary { grid-template-columns: repeat(2, 1fr); }
  .footer-top { grid-template-columns: 1fr 1fr; }
  .footer-top > .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 768px) {
  .nav-links { display: none; flex-direction: column; position: absolute; top: 68px; left: 0; right: 0; background: rgba(10,12,15,0.97); padding: 1rem 2rem 2rem; border-bottom: 1px solid var(--border); gap: 1rem; }
  .nav-links.open { display: flex; }
  .nav-toggle { display: flex; }

  .flow-diagram { flex-direction: column; }
  .flow-arrow { transform: rotate(90deg); }
  .components-grid { grid-template-columns: 1fr; }

  /* Flowchart wraps to 2 rows on small screens */
  .sim-flowchart {
    flex-wrap: wrap;
    gap: 8px;
  }
  .sim-wire-h {
    flex: 0 0 20px;
    min-width: 20px;
  }
  .sim-node { min-width: 100px; flex: 1 1 auto; }

  .sim-outputs { grid-template-columns: 1fr 1fr; }
  .hero-stats { grid-template-columns: 1fr; }
  .hero-stat { border-right: none; border-bottom: 1px solid var(--border); }
  .perf-summary { grid-template-columns: 1fr 1fr; }
  .footer-top { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
  .section { padding: 60px 1.2rem; }
  .sim-outputs { grid-template-columns: 1fr; }
  .perf-summary { grid-template-columns: 1fr; }
}