/* ============================================================
   GUIDE — «Как читать промты»: формула + советы
   ============================================================ */

.guide {
  position: relative;
  padding: var(--section-pad) var(--pad);
  background: var(--bg);
  border-top: 1px solid var(--hair);
}
.guide .wrap {
  max-width: var(--maxw);
  margin: 0 auto;
}

/* ---- ФОРМУЛА: тёмная панель-спецификация ---- */
.formula {
  position: relative;
  display: flex;
  align-items: stretch;
  gap: 0;
  background: #1B1C1E;
  border-radius: 6px;
  padding: clamp(8px, 1vw, 14px);
  overflow: hidden;
  isolation: isolate;
}
/* блюпринт-сетка на панели */
.formula::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background:
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 44px 44px;
  pointer-events: none;
}
/* синее свечение в углу */
.formula-glow {
  position: absolute;
  z-index: 0;
  top: -40%;
  right: -10%;
  width: 60%;
  height: 160%;
  background: radial-gradient(circle at 50% 50%, rgba(88,117,164,0.5) 0%, rgba(88,117,164,0) 60%);
  filter: blur(40px);
  pointer-events: none;
}

.step {
  position: relative;
  z-index: 1;
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: clamp(22px, 2vw, 34px) clamp(16px, 1.4vw, 26px);
}
.step-num {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--blue-pale);
  font-variant-numeric: lining-nums;
  margin-bottom: 16px;
}
.step-name {
  font-size: clamp(15px, 1.3vw, 18px);
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #fff;
  margin-bottom: 12px;
}
.step-desc {
  font-size: 13px;
  line-height: 1.5;
  color: rgba(255,255,255,0.55);
}

.arrow {
  position: relative;
  z-index: 1;
  flex: none;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  color: rgba(88,117,164,0.9);
}

/* ---- СОВЕТЫ ---- */
.tips {
  margin-top: clamp(16px, 1.8vw, 26px);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--hair);
  border: 1px solid var(--hair);
  border-radius: 6px;
  overflow: hidden;
}
.tip {
  background: var(--white);
  padding: clamp(24px, 2.4vw, 36px);
  display: flex;
  flex-direction: column;
}
.tip-num {
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--blue);
  font-variant-numeric: lining-nums;
  margin-bottom: clamp(18px, 2.4vw, 30px);
}
.tip-title {
  font-size: clamp(16px, 1.4vw, 19px);
  font-weight: 500;
  letter-spacing: -0.005em;
  color: var(--ink);
  margin-bottom: 10px;
}
.tip-title .mono {
  font-feature-settings: "tnum";
  color: var(--blue);
}
.tip-text {
  font-size: 14px;
  line-height: 1.5;
  color: var(--graphite);
}

/* ---- REVEAL-СТАГГЕР ---- */
.tip[data-reveal]:nth-child(1) { transition-delay: 0.04s; }
.tip[data-reveal]:nth-child(2) { transition-delay: 0.12s; }
.tip[data-reveal]:nth-child(3) { transition-delay: 0.20s; }
.tip[data-reveal]:nth-child(4) { transition-delay: 0.28s; }

/* стаггер шагов формулы (панель появляется как блок, шаги — внутри) */
.formula .step, .formula .arrow { opacity: 0; transform: translateY(10px); transition: opacity 0.6s var(--ease), transform 0.6s var(--ease); }
.formula.in .step, .formula.in .arrow { opacity: 1; transform: none; }
.formula.in .step:nth-child(1) { transition-delay: 0.10s; }
.formula.in .arrow:nth-child(2) { transition-delay: 0.18s; }
.formula.in .step:nth-child(3) { transition-delay: 0.24s; }
.formula.in .arrow:nth-child(4) { transition-delay: 0.32s; }
.formula.in .step:nth-child(5) { transition-delay: 0.38s; }
.formula.in .arrow:nth-child(6) { transition-delay: 0.46s; }
.formula.in .step:nth-child(7) { transition-delay: 0.52s; }
.formula.in .arrow:nth-child(8) { transition-delay: 0.60s; }
.formula.in .step:nth-child(9) { transition-delay: 0.66s; }

/* ---- АДАПТИВ ---- */
@media (max-width: 1080px) {
  .tips { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 920px) {
  .formula { flex-direction: column; }
  .step { padding: 22px clamp(16px, 4vw, 28px); }
  .arrow { width: 100%; height: 28px; transform: rotate(90deg); }
  .formula.in .arrow { transform: rotate(90deg); }
}
@media (max-width: 520px) {
  .tips { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  .formula .step, .formula .arrow { opacity: 1; transform: none; }
  .formula.in .arrow { transform: none; }
}