/*
  Purpose: Layout, page grid, topbar, hero, section spacing, responsive rules.
  Dependencies: base.css variables
*/
.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 40px;
  background: rgba(7, 8, 10, 0.9);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 18px;
}

.logo {
  font-family: var(--font-display);
  font-size: 26px;
  letter-spacing: 1px;
}

.logo span {
  color: var(--green);
  margin-left: 4px;
}

.live-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg2);
}

.live-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
  animation: blink 1.2s infinite;
}

.page {
  position: relative;
  z-index: 1;
  padding: 40px 40px 120px;
  display: grid;
  gap: 40px;
}

.hero {
  display: grid;
  gap: 12px;
  animation: fadeUp 0.6s ease both;
  max-width: 680px;
  margin: 0 auto;
  width: 100%;
}

.hero-content {
  max-width: 600px;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(36px, 6vw, 64px);
  letter-spacing: 2px;
}

.hero p {
  color: var(--dim);
  margin-top: 6px;
}

.hero-tags {
  display: flex;
  gap: 10px;
  margin-top: 16px;
}

.calculator {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  align-items: start;
  max-width: 680px;
  margin: 0 auto;
}

.calc-card {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 22px;
  animation: fadeUp 0.6s ease 0.1s both;
}

.formula {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 22px;
  animation: fadeUp 0.6s ease 0.2s both;
  max-width: 680px;
  margin: 0 auto;
}

.footer-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 14px 40px;
  background: var(--bg3);
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--dim);
  z-index: 5;
}

@media (max-width: 900px) {
  .calculator {
    grid-template-columns: 1fr;
  }
}

/* Embed Section */
.embed-section {
  max-width: 680px;
  margin: 60px auto 0;
  padding: 0 20px;
}

.embed-content {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px;
  display: grid;
  gap: 16px;
}

.embed-content h2 {
  font-family: "JetBrains Mono", monospace;
  font-size: 14px;
  color: var(--green);
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  margin: 0;
}

.embed-content p {
  color: var(--dim);
  font-size: 13px;
  margin: 0;
  line-height: 1.5;
}

.embed-code-box {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px;
  display: grid;
  gap: 10px;
}

.embed-code-box h3 {
  font-family: "JetBrains Mono", monospace;
  font-size: 12px;
  color: var(--white);
  font-weight: 600;
  margin: 0;
  letter-spacing: 0.3px;
}

.embed-code-box textarea {
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  color: var(--green);
  font-family: "JetBrains Mono", monospace;
  font-size: 11px;
  line-height: 1.4;
  resize: none;
  height: 140px;
}

.copy-btn {
  background: var(--green);
  color: #020202;
  border: none;
  border-radius: 8px;
  padding: 8px 12px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: 0.15s ease;
}

.copy-btn:hover {
  opacity: 0.9;
}

.copy-btn.copied {
  background: var(--yellow);
  color: #020202;
}

@media (max-width: 600px) {
  .topbar {
    padding: 12px 16px;
  }

  .topbar-left {
    gap: 10px;
    flex-wrap: wrap;
  }

  .logo {
    font-size: 22px;
  }

  .live-badge {
    font-size: 11px;
    padding: 4px 8px;
  }

  .page {
    padding: 24px 16px 100px;
  }

  .hero-tags {
    flex-wrap: wrap;
  }

  .calc-card,
  .formula {
    padding: 16px;
  }

  .embed-section {
    margin-top: 40px;
    padding: 0 16px;
  }

  .embed-content {
    padding: 18px;
  }

  .embed-content {
    padding: 20px;
  }

  .embed-code-box textarea {
    height: 160px;
    font-size: 10px;
  }
}