/* ==========================================================================
   HOME — 3-2 단계 전용 스타일
   다른 13개 Page Shell에는 영향을 주지 않는다 (index.html에서만 로드).
   ========================================================================== */

@media (prefers-reduced-motion: no-preference) {
  .fade-up {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 0.6s ease, transform 0.6s ease;
  }
  .fade-up.is-visible {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- Section 공통 ---------- */
.home-section {
  padding: 72px 0;
}

.home-section--alt {
  background: var(--color-section-bg);
}

.home-section__head {
  max-width: 640px;
  margin: 0 0 40px;
}

.home-section__eyebrow {
  font-size: var(--fs-small);
  font-weight: 700;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin: 0 0 10px;
}

.home-section__title {
  font-size: var(--fs-h2);
  font-weight: 700;
  color: var(--color-primary);
  margin: 0 0 12px;
  line-height: 1.35;
}

.home-section__desc {
  font-size: var(--fs-body);
  color: var(--color-text-secondary);
  margin: 0;
}

@media (max-width: 768px) {
  .home-section {
    padding: 48px 0;
  }
}

/* ---------- Hero 순차 등장 (§4) ----------
   Hero는 above-the-fold라 scroll reveal이 아니라 load 시 js/home.js가 순서대로 is-visible을 추가한다.
   순서: eyebrow → H1 → 설명문 → CTA → 태양광 이미지. 전체가 동시에 나타나지 않도록 짧은 stagger를 둔다. */
.hero-step {
  opacity: 0;
  transform: translateY(var(--reveal-distance));
  transition: opacity var(--motion-normal) var(--ease-out), transform var(--motion-normal) var(--ease-out);
}
.hero-step.is-visible {
  opacity: 1;
  transform: none;
}
/* 태양광 이미지는 이동 대신 아주 약한 fade+scale만 허용(큰 zoom 금지) */
.hero-step--visual {
  transform: scale(0.98);
}
.hero-step--visual.is-visible {
  transform: none;
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  background: linear-gradient(180deg, #0B2545 0%, #0E3966 100%);
  color: #fff;
  padding: 96px 0 88px;
  overflow: hidden;
}

.hero__grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  color: #7FDCCB;
  letter-spacing: 0.04em;
  margin: 0 0 20px;
}

.hero__title {
  font-size: var(--fs-hero);
  font-weight: 800;
  line-height: 1.25;
  margin: 0 0 20px;
  letter-spacing: -0.01em;
}

.hero__sub {
  font-size: 18px;
  color: #C9D4E5;
  line-height: 1.6;
  margin: 0 0 32px;
  max-width: 480px;
}

.hero__cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.hero .btn-secondary {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.35);
  color: #fff;
}

.hero .btn-secondary:hover,
.hero .btn-secondary:focus-visible {
  border-color: #fff;
  background: rgba(255, 255, 255, 0.08);
}

/* Hero visual — 3-5: 기존 ls-est.com HOME Hero 배경(태양광) 실제 이미지 연결 */
.hero__visual {
  position: relative;
  aspect-ratio: 4 / 3;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.12);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  text-align: center;
  padding: 24px;
}

.hero__visual-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
}

.hero__visual-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(11, 37, 69, 0.72) 0%, rgba(11, 37, 69, 0.55) 100%);
  z-index: 1;
}

.hero__visual-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.06) 1px, transparent 1px);
  background-size: 32px 32px;
  border-radius: var(--radius-md);
}

.hero__visual-label {
  position: relative;
  font-size: 13px;
  color: #9FB3CC;
  letter-spacing: 0.04em;
  background: rgba(11, 37, 69, 0.6);
  border: 1px dashed rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-sm);
  padding: 8px 14px;
}

@media (max-width: 1024px) {
  .hero__grid {
    grid-template-columns: 1fr;
  }
  .hero__visual {
    order: -1;
    max-width: 420px;
    margin: 0 auto;
  }
}

@media (max-width: 768px) {
  .hero {
    padding: 56px 0 48px;
  }
  .hero__title {
    font-size: var(--fs-hero);
  }
  .hero__cta-group {
    flex-direction: column;
  }
  .hero__cta-group .btn {
    width: 100%;
  }
}

/* ---------- Solution Steps ---------- */
.solution-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.solution-step {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px 20px;
  position: relative;
}

.solution-step__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--color-section-bg);
  color: var(--color-primary);
  font-weight: 700;
  font-size: 14px;
  margin-bottom: 14px;
}

.solution-step__title {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-primary);
  margin: 0 0 6px;
}

.solution-step__desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin: 0;
  line-height: 1.55;
}

.solution-arrow {
  display: none;
}

@media (min-width: 769px) {
  .solution-steps {
    align-items: stretch;
  }
}

@media (max-width: 768px) {
  .solution-steps {
    grid-template-columns: 1fr;
    gap: 12px;
  }
}

/* ---------- Service Cards ---------- */
.service-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.service-card {
  display: flex;
  flex-direction: column;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.service-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.service-card__index {
  font-size: 13px;
  font-weight: 700;
  color: var(--color-accent);
  margin: 0 0 14px;
}

.service-card__title {
  font-size: 19px;
  font-weight: 700;
  color: var(--color-primary);
  margin: 0 0 10px;
}

.service-card__desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin: 0 0 20px;
  flex: 1;
}

.service-card__link {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.service-card__link:hover,
.service-card__link:focus-visible {
  color: var(--color-accent);
}

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

/* ---------- RE100 Solution list ---------- */
.re100-panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}

.re100-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.re100-list li {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 16px 18px;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.re100-list__bullet {
  flex-shrink: 0;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
  margin-top: 8px;
}

.re100-list__label {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
  margin: 0 0 4px;
}

.re100-list__desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin: 0;
  line-height: 1.6;
}

.re100-note {
  font-size: 13px;
  color: var(--color-text-secondary);
  border-top: 1px solid var(--color-border);
  padding-top: 16px;
  margin-top: 8px;
}

@media (max-width: 900px) {
  .re100-panel {
    grid-template-columns: 1fr;
  }
}

/* ---------- Why Now Insight Cards ---------- */
.insight-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.insight-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 26px 22px;
}

.insight-card__num {
  font-size: 13px;
  font-weight: 700;
  color: var(--color-text-secondary);
  margin: 0 0 12px;
}

.insight-card__title {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-primary);
  margin: 0 0 10px;
}

.insight-card__desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.65;
  margin: 0;
}

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

/* ---------- Case Assets (existing site cases) ---------- */
.case-note {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin: 0 0 20px;
}

.case-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.case-slot {
  aspect-ratio: 3 / 2;
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
  background: #fff;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 16px;
  text-align: center;
}

.case-slot--has-image {
  border-style: solid;
  position: relative;
  overflow: hidden;
  padding: 0;
  justify-content: flex-end;
}

.case-slot__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
}

.case-slot--has-image .case-slot__name {
  position: relative;
  z-index: 1;
  width: 100%;
  padding: 10px 12px;
  background: linear-gradient(180deg, rgba(11,37,69,0) 0%, rgba(11,37,69,0.82) 100%);
  color: #fff;
}

.case-slot__name {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-primary);
}

.case-slot__pending {
  font-size: 12px;
  color: var(--color-text-secondary);
  font-family: monospace;
}

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

/* ---------- Home Project Cases (3-14C-2, §12) ---------- */
.home-project-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.home-project-card {
  display: flex;
  flex-direction: column;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.home-project-card:hover,
.home-project-card:focus-visible {
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.home-project-card__img-wrap {
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--color-section-bg);
}

.home-project-card__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.home-project-card__body {
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.home-project-card__type {
  font-size: 12px;
  font-weight: 700;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.home-project-card__title {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-primary);
  margin: 0;
  line-height: 1.4;
}

.home-project-card__meta {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin: 0;
}

@media (max-width: 900px) {
  .home-project-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 560px) {
  .home-project-grid {
    grid-template-columns: 1fr;
  }
}

/* ---------- Consulting & Briefing Cards ---------- */
.briefing-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.briefing-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 30px 26px;
  display: flex;
  flex-direction: column;
}

.briefing-card__title {
  font-size: 19px;
  font-weight: 700;
  color: var(--color-primary);
  margin: 0 0 10px;
}

.briefing-card__desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin: 0 0 22px;
  flex: 1;
}

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

/* ---------- LS ELECTRIC ---------- */
.partner-band {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 36px;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.partner-band__text {
  max-width: 520px;
}

.partner-band__title {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
  margin: 0 0 8px;
}

.partner-band__desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin: 0;
  line-height: 1.6;
}

.partner-band__asset {
  flex-shrink: 0;
  width: 220px;
  height: 88px;
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-family: monospace;
  color: var(--color-text-secondary);
  text-align: center;
  padding: 8px;
}

.partner-band__asset--has-image {
  border-style: solid;
  background: #0B0B0B;
  padding: 12px;
}

.partner-band__asset--has-image img {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
}

@media (max-width: 768px) {
  .partner-band {
    flex-direction: column;
    text-align: center;
    padding: 28px 22px;
  }
  .partner-band__asset {
    width: 100%;
  }
}

/* ---------- Final CTA ---------- */
.final-cta {
  background: var(--color-primary);
  color: #fff;
  padding: 64px 0;
  text-align: center;
}

.final-cta__title {
  font-size: var(--fs-h2);
  font-weight: 700;
  margin: 0 0 12px;
}

.final-cta__desc {
  font-size: 15px;
  color: #C9D4E5;
  margin: 0 0 28px;
}

.final-cta__group {
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
}

.final-cta .btn-secondary {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.35);
  color: #fff;
}

.final-cta .btn-secondary:hover,
.final-cta .btn-secondary:focus-visible {
  border-color: #fff;
  background: rgba(255, 255, 255, 0.08);
}

@media (max-width: 768px) {
  .final-cta__group {
    flex-direction: column;
    align-items: stretch;
  }
}