/* ══════════════════════════════════════════
   HOME — Homepage-specific styles
══════════════════════════════════════════ */

/* Hero */
.hero {
  border-bottom: 1px solid var(--rule);
  padding: 96px 48px 88px;
  display: grid;
  grid-template-columns: 1fr 400px;
  gap: 64px;
  align-items: end;
  max-width: 1200px;
  margin: 0 auto;
}
.hero-eyebrow {
  font-family: var(--mono); font-size: 11px; font-weight: 400;
  color: var(--accent); letter-spacing: 0.1em;
  text-transform: uppercase; margin-bottom: 20px;
  animation: fadeUp 0.5s ease both;
}
.hero h1 {
  font-family: var(--sans); font-size: clamp(36px, 5vw, 60px);
  font-weight: 300; color: var(--ink); line-height: 1.1;
  letter-spacing: -0.02em; margin-bottom: 24px;
  animation: fadeUp 0.5s 0.08s ease both;
}
.hero h1 strong { font-weight: 700; }
.hero-desc {
  font-size: 17px; font-weight: 300; color: var(--ink2);
  line-height: 1.7; max-width: 520px; margin-bottom: 40px;
  animation: fadeUp 0.5s 0.16s ease both;
}
.hero-cta {
  display: flex; gap: 12px; align-items: center;
  animation: fadeUp 0.5s 0.24s ease both;
}

/* Hero equation card */
.hero-eq {
  border: 1px solid var(--rule);
  background: var(--white);
  padding: 32px;
  align-self: center;
  animation: fadeUp 0.5s 0.12s ease both;
}
.eq-label {
  font-family: var(--mono); font-size: 10px; color: var(--ink4);
  letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 16px;
  padding-bottom: 12px; border-bottom: 1px solid var(--rule);
}
.eq-main {
  font-family: var(--mono); font-size: 22px; font-weight: 500;
  color: var(--ink); letter-spacing: 0.02em; margin-bottom: 20px;
  line-height: 1.4;
}
.eq-main .var-accent { color: var(--accent); }
.eq-vars { display: flex; flex-direction: column; gap: 8px; }
.eq-var {
  display: flex; gap: 12px; align-items: baseline;
  font-size: 12px;
}
.eq-var-sym {
  font-family: var(--mono); font-weight: 500; color: var(--accent);
  min-width: 24px;
}
.eq-var-def { color: var(--ink3); }

/* Stats bar */
.stats-bar {
  border-bottom: 1px solid var(--rule);
  background: var(--white);
}
.stats-inner {
  max-width: 1200px; margin: 0 auto;
  display: grid; grid-template-columns: repeat(4, 1fr);
}
.stat {
  padding: 28px 48px;
  border-right: 1px solid var(--rule);
}
.stat:last-child { border-right: none; }
.stat-val {
  font-family: var(--mono); font-size: 28px; font-weight: 500;
  color: var(--ink); letter-spacing: -0.02em; line-height: 1;
  margin-bottom: 6px;
}
.stat-val span { color: var(--accent); }
.stat-lbl {
  font-family: var(--mono); font-size: 10px; color: var(--ink4);
  letter-spacing: 0.08em; text-transform: uppercase;
}

/* Tools section */
.tools-section {
  max-width: 1200px; margin: 0 auto;
  padding: 80px 48px;
  border-bottom: 1px solid var(--rule);
}
.tools-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}
.tool-card {
  background: var(--white);
  padding: 48px;
  display: flex; flex-direction: column;
  text-decoration: none; color: inherit;
  transition: background 0.15s;
  position: relative;
}
.tool-card:hover { background: var(--bg); }
.tool-card:hover .tool-arrow { transform: translate(3px, -3px); }
.tool-num {
  font-family: var(--mono); font-size: 11px; color: var(--ink4);
  letter-spacing: 0.1em; margin-bottom: 32px;
}
.tool-card h2 {
  font-size: 22px; font-weight: 700; color: var(--ink);
  line-height: 1.2; margin-bottom: 14px; letter-spacing: -0.01em;
}
.tool-card p {
  font-size: 14px; font-weight: 300; color: var(--ink2);
  line-height: 1.7; margin-bottom: 32px; flex: 1;
}
.tool-features {
  display: flex; flex-direction: column; gap: 0;
  border-top: 1px solid var(--rule); margin-bottom: 32px;
}
.tool-feature {
  font-family: var(--mono); font-size: 11px; color: var(--ink3);
  padding: 10px 0; border-bottom: 1px solid var(--rule);
  letter-spacing: 0.02em;
  display: flex; align-items: center; gap: 10px;
}
.tool-feature::before { content: '—'; color: var(--accent); }
.tool-footer {
  display: flex; align-items: center; justify-content: space-between;
}
.tool-cta {
  font-family: var(--mono); font-size: 11px; font-weight: 500;
  color: var(--accent); letter-spacing: 0.06em; text-transform: uppercase;
}
.tool-arrow {
  font-size: 18px; color: var(--accent);
  transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
  display: inline-block;
}

/* How it works */
.how-section {
  max-width: 1200px; margin: 0 auto;
  padding: 80px 48px;
  border-bottom: 1px solid var(--rule);
}
.steps {
  display: grid; grid-template-columns: repeat(4,1fr);
  gap: 0; background: var(--rule);
  border: 1px solid var(--rule);
}
.step {
  background: var(--white); padding: 36px 32px;
  position: relative;
}
.step-num {
  font-family: var(--mono); font-size: 48px; font-weight: 300;
  color: var(--rule); line-height: 1; margin-bottom: 16px;
  letter-spacing: -0.04em;
}
.step h4 {
  font-size: 14px; font-weight: 700; color: var(--ink);
  margin-bottom: 8px; letter-spacing: -0.01em;
}
.step p {
  font-size: 13px; font-weight: 300; color: var(--ink3); line-height: 1.6;
}
.step-accent { color: var(--accent); font-weight: 500; }

/* Topics */
.topics-section {
  max-width: 1200px; margin: 0 auto;
  padding: 80px 48px;
  border-bottom: 1px solid var(--rule);
}
.topics-grid {
  display: grid; grid-template-columns: repeat(3,1fr);
  gap: 0; background: var(--rule);
  border: 1px solid var(--rule);
}
.topic {
  background: var(--white); padding: 28px 28px;
}
.topic h4 {
  font-size: 13px; font-weight: 700; color: var(--ink);
  margin-bottom: 8px; letter-spacing: -0.01em;
}
.topic p {
  font-size: 12px; font-weight: 300; color: var(--ink3); line-height: 1.6;
}
.topic-tag {
  display: inline-block; font-family: var(--mono); font-size: 9px;
  color: var(--accent); letter-spacing: 0.08em; text-transform: uppercase;
  border: 1px solid rgba(0,71,255,0.2); padding: 2px 7px;
  border-radius: 2px; margin-bottom: 10px;
}

/* Responsive */
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; padding: 64px 28px; }
  .hero-eq { display: none; }
  .stats-inner { grid-template-columns: 1fr 1fr; }
  .stat { padding: 22px 28px; }
  .tools-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr 1fr; }
  .topics-grid { grid-template-columns: 1fr 1fr; }
  .tools-section, .how-section, .topics-section { padding: 56px 28px; }
}
@media (max-width: 600px) {
  .steps { grid-template-columns: 1fr; }
  .topics-grid { grid-template-columns: 1fr; }
  .stats-inner { grid-template-columns: 1fr 1fr; }
}