:root {
  --bg: #06060a;
  --surface: rgba(18, 18, 24, 0.8);
  --surface-solid: #121218;
  --surface-raised: rgba(28, 28, 38, 0.9);
  --border: rgba(255,255,255,0.06);
  --border-strong: rgba(255,255,255,0.1);
  --text: #f0f0f5;
  --text-secondary: #9898a8;
  --text-tertiary: #5c5c6e;
  --green: #34c759;
  --green-dim: rgba(52,199,89,0.12);
  --green-glow: rgba(52,199,89,0.25);
  --yellow: #e8a838;
  --yellow-dim: rgba(232,168,56,0.12);
  --red: #e04040;
  --red-dim: rgba(224,64,64,0.12);
  --font-display: "DM Serif Display", Georgia, serif;
  --font-body: "DM Sans", -apple-system, BlinkMacSystemFont, sans-serif;
  --radius-sm: 0.6rem;
  --radius: 0.85rem;
  --radius-lg: 1.25rem;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Ambient glow background */
.bg-ambient { position: fixed; inset: 0; pointer-events: none; z-index: 0; overflow: hidden; }
.glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.18;
}
.glow-1 { width: 600px; height: 600px; background: rgba(52,199,89,0.25); top: -15%; right: -10%; }
.glow-2 { width: 400px; height: 400px; background: rgba(232,168,56,0.15); bottom: 10%; left: -10%; }
.glow-3 { width: 300px; height: 300px; background: rgba(224,64,64,0.12); top: 50%; left: 40%; }

/* === TOPBAR === */
.topbar {
  position: relative; z-index: 2;
  display: flex; justify-content: space-between; align-items: center;
  max-width: 1200px; margin: 0 auto;
  padding: 1.35rem 2rem;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}
.logo {
  display: flex; align-items: center; gap: 0.55rem;
  text-decoration: none; color: var(--text);
}
.logo-mark { color: var(--green); }
.logo-text { font-weight: 600; font-size: 0.95rem; letter-spacing: -0.01em; }
.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 500;
  transition: color 0.2s;
}
.nav-link:hover { color: var(--text); }

/* === HERO === */
.hero {
  position: relative; z-index: 1;
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 3rem; align-items: center;
  max-width: 1200px; margin: 0 auto;
  padding: 2.5rem 2rem 3rem;
}

.badge {
  display: inline-flex; align-items: center; gap: 0.35rem;
  font-size: 0.8rem; font-weight: 500;
  color: var(--green);
  background: var(--green-dim);
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  margin-bottom: 1.5rem;
}
h1 {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  line-height: 1.06;
  font-weight: 400;
  letter-spacing: -0.015em;
  margin-bottom: 1rem;
}
h1 em { font-style: italic; color: var(--green); }
.subhead {
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.6;
  max-width: 46ch;
  margin-bottom: 1.75rem;
}

/* Threshold row */
.threshold-row {
  display: flex; align-items: center; gap: 0.75rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}
.thresh {
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius-sm);
  text-align: center;
  min-width: 90px;
}
.thresh-pct {
  display: block;
  font-family: var(--font-display);
  font-size: 1.4rem;
  line-height: 1;
  font-weight: 700;
}
.thresh-label { font-size: 0.72rem; color: var(--text-tertiary); display: block; margin-top: 0.15rem; }
.thresh-safe { background: var(--green-dim); border: 1px solid rgba(52,199,89,0.2); }
.thresh-safe .thresh-pct { color: var(--green); }
.thresh-warn { background: var(--yellow-dim); border: 1px solid rgba(232,168,56,0.2); }
.thresh-warn .thresh-pct { color: var(--yellow); }
.thresh-critical { background: var(--red-dim); border: 1px solid rgba(224,64,64,0.2); }
.thresh-critical .thresh-pct { color: var(--red); }
.thresh-sep { color: var(--text-tertiary); font-size: 0.9rem; }

.cta-row { display: flex; flex-wrap: wrap; gap: 0.75rem; }
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.8rem 1.3rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s ease;
  font-family: var(--font-body);
}
.btn-dark {
  background: #fff; color: #000;
  box-shadow: 0 0 24px rgba(255,255,255,0.08);
}
.btn-dark:hover { transform: translateY(-1px); box-shadow: 0 0 32px rgba(255,255,255,0.14); }
.btn-outline {
  background: transparent; color: var(--text);
  border: 1px solid var(--border-strong);
}
.btn-outline:hover { background: rgba(255,255,255,0.04); border-color: rgba(255,255,255,0.18); }

/* === HERO VISUAL (terminal + battery stacked) === */
.hero-visual {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

/* === TERMINAL CONSOLE === */
.hero-terminal {
  width: 100%;
  max-width: 380px;
  background: rgba(10, 10, 16, 0.85);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 8px 32px rgba(0,0,0,0.4), 0 0 0 1px rgba(52,199,89,0.06);
}
.term-header {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.6rem 0.8rem;
  background: rgba(0,0,0,0.3);
  border-bottom: 1px solid var(--border);
}
.term-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
}
.term-dot-red { background: #e04040; }
.term-dot-yellow { background: #e8a838; }
.term-dot-green { background: #34c759; }
.term-title {
  margin-left: 0.5rem;
  font-family: "JetBrains Mono", "SF Mono", "Fira Code", monospace;
  font-size: 0.66rem;
  color: var(--text-tertiary);
  letter-spacing: 0.02em;
}
.term-body {
  padding: 0.9rem 0.8rem;
  font-family: "JetBrains Mono", "SF Mono", "Fira Code", monospace;
  font-size: 0.7rem;
  line-height: 1.75;
}
.term-body p { margin-bottom: 0.1rem; }
.term-prompt { color: var(--green); margin-right: 0.35rem; }
.term-line { color: var(--text-secondary); }
.term-green { color: var(--green); font-weight: 600; }
.term-dim { color: #52525b; }
.term-status {
  margin-top: 0.5rem;
  color: var(--green);
}
.term-blink { animation: termBlink 2s step-end infinite; }
@keyframes termBlink { 50% { opacity: 0.3; } }
.battery-preview {
  width: 100%;
  max-width: 380px;
  text-align: center;
  position: relative;
}
.battery-shell {
  display: flex; align-items: center;
  position: relative;
}
.battery-body {
  flex: 1;
  height: 175px;
  border: 3px solid var(--border-strong);
  border-radius: 10px;
  position: relative;
  overflow: hidden;
  background: rgba(255,255,255,0.02);
}
.battery-cap {
  width: 20px; height: 55px;
  border: 3px solid var(--border-strong);
  border-left: none;
  border-radius: 0 6px 6px 0;
  background: rgba(255,255,255,0.02);
}
.battery-fill {
  position: absolute;
  bottom: 0; left: 10px; right: 10px;
  height: 78%;
  background: linear-gradient(180deg, var(--green) 0%, rgba(52,199,89,0.6) 100%);
  border-radius: 4px;
  animation: fillPulse 3s ease-in-out infinite;
  box-shadow: 0 0 30px var(--green-glow), inset 0 1px 0 rgba(255,255,255,0.2);
}
@keyframes fillPulse {
  0%, 100% { box-shadow: 0 0 20px var(--green-glow), inset 0 1px 0 rgba(255,255,255,0.2); }
  50% { box-shadow: 0 0 40px var(--green-glow), inset 0 1px 0 rgba(255,255,255,0.3); }
}
.battery-pulse-ring {
  position: absolute;
  inset: -8px;
  border-radius: 14px;
  border: 1.5px solid rgba(52,199,89,0.3);
  animation: ringPulse 3s ease-in-out infinite;
}
@keyframes ringPulse {
  0%, 100% { opacity: 0.4; transform: scale(1); }
  50% { opacity: 0.15; transform: scale(1.04); }
}
.battery-label {
  margin-top: 1.5rem;
}
.battery-pct {
  font-family: var(--font-display);
  font-size: 3.4rem;
  font-weight: 700;
  color: var(--green);
  line-height: 1;
}
.battery-state {
  display: block;
  font-size: 0.9rem;
  color: var(--text-tertiary);
  margin-top: 0.2rem;
}
.battery-indicators {
  display: flex; justify-content: center; gap: 2rem;
  margin-top: 1.25rem;
}
.ind {
  display: flex; flex-direction: column; align-items: center; gap: 0.4rem;
  font-size: 0.75rem; color: var(--text-tertiary);
}
.ind span {
  width: 6px; height: 6px; border-radius: 50%;
}
.ind-done span { background: var(--green); }
.ind-done { color: var(--green); }
.ind-active span { background: var(--yellow); box-shadow: 0 0 8px rgba(232,168,56,0.5); animation: blink 2s step-end infinite; }
.ind-active { color: var(--yellow); }
.ind-pending span { background: #3a3a45; }

@keyframes blink { 50% { opacity: 0.3; } }

/* === FEATURES === */
.features {
  position: relative; z-index: 1;
  max-width: 1200px; margin: 0 auto;
  padding: 2rem 2rem 3rem;
}
.section-title {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 400;
  margin-bottom: 1.5rem;
}
.features-grid {
  display: grid; grid-template-columns: repeat(2, 1fr);
  gap: 0.85rem;
}
.feature {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  transition: border-color 0.2s, transform 0.2s;
}
.feature:hover { border-color: var(--border-strong); transform: translateY(-2px); }
.feature-num {
  font-family: var(--font-display);
  font-size: 1rem;
  color: var(--green);
  margin-bottom: 0.75rem;
  opacity: 0.6;
}
.feature h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.45rem;
}
.feature p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.55;
}

/* === PREMIUM === */
.premium {
  position: relative; z-index: 1;
  max-width: 1200px; margin: 0 auto;
  padding: 0 2rem 3rem;
}
.premium-wrap {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 2rem; align-items: center;
  background: var(--surface-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}
.premium-chip {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--green);
  background: var(--green-dim);
  padding: 0.25rem 0.6rem;
  border-radius: 0.3rem;
  margin-bottom: 0.85rem;
}
.premium-text h2 {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 400;
  margin-bottom: 0.6rem;
}
.premium-text p {
  color: var(--text-secondary);
  line-height: 1.55;
  max-width: 42ch;
}
.premium-note { font-size: 0.82rem; color: var(--text-tertiary); margin-top: 0.75rem; }

/* Slider visual */
.slider-visual { padding: 1rem 0; }
.slider-label { font-size: 0.8rem; color: var(--text-tertiary); margin-bottom: 0.75rem; display: block; }
.slider-track {
  height: 8px;
  background: rgba(255,255,255,0.06);
  border-radius: 999px;
  position: relative;
}
.slider-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--green), var(--yellow), var(--red));
  border-radius: 999px;
  animation: sliderMove 4s ease-in-out infinite;
}
@keyframes sliderMove {
  0%, 100% { width: 65%; }
  50% { width: 30%; }
}
.slider-thumb {
  position: absolute; top: 50%; transform: translate(-50%, -50%);
  background: var(--bg);
  border: 2px solid var(--green);
  color: var(--green);
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  white-space: nowrap;
  animation: thumbMove 4s ease-in-out infinite;
}
@keyframes thumbMove {
  0%, 100% { left: 65%; border-color: var(--green); color: var(--green); }
  50% { left: 30%; border-color: var(--yellow); color: var(--yellow); }
}

/* === FOOTER === */
.footer {
  position: relative; z-index: 1;
  border-top: 1px solid var(--border);
  padding: 1.5rem 2rem 3rem;
}
.footer-content {
  max-width: 1200px; margin: 0 auto;
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 0.75rem;
  color: var(--text-tertiary);
  font-size: 0.84rem;
}
.footer nav { display: flex; align-items: center; gap: 0.6rem; }
.footer a { color: var(--text-tertiary); text-decoration: none; transition: color 0.2s; }
.footer a:hover { color: var(--text); }
.foot-dot { color: rgba(255,255,255,0.1); }

/* === RESPONSIVE === */
@media (max-width: 920px) {
  .hero { grid-template-columns: 1fr; gap: 2rem; padding: 1rem 1.25rem 1.5rem; }
  .features-grid { grid-template-columns: 1fr; }
  .premium-wrap { grid-template-columns: 1fr; }
  .features { padding: 0 1.25rem 1.5rem; }
  .premium { padding: 0 1.25rem 2rem; }
  .footer-content { flex-direction: column; text-align: center; }
  .topbar { padding: 1rem 1.25rem; }
  .hero-visual { order: -1; }
  .hero-terminal { max-width: 320px; }
  .battery-preview { max-width: 320px; }
  .battery-body { height: 140px; }
  .battery-cap { height: 44px; width: 16px; }
  .battery-pct { font-size: 2.6rem; }
}