/* ============================================================
   front-page.css — Top Page
   B.I.Y Corporate Design System
   ============================================================ */

/* ── Hero ──────────────────────────────────────────────── */
.hero {
  position: relative;
  background-color: var(--color-navy);
  color: var(--color-white);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 180px 0 140px;
  min-height: 92vh;
  isolation: isolate;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(ellipse 76% 54% at 50% 38%, rgba(200, 168, 74, 0.16) 0%, transparent 64%),
    linear-gradient(90deg, rgba(8, 20, 39, 0.88) 0%, rgba(15, 37, 71, 0.56) 44%, rgba(8, 20, 39, 0.88) 100%),
    linear-gradient(180deg, rgba(8, 20, 39, 0.24) 0%, rgba(8, 20, 39, 0.72) 100%);
  pointer-events: none;
  z-index: 1;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url("../images/hero-ai-field.png");
  background-position: center;
  background-size: cover;
  opacity: 0.7;
  filter: saturate(0.88) contrast(1.08);
  transform: scale(1.01);
  pointer-events: none;
  z-index: 0;
}

.hero__pattern {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(90deg, rgba(255, 255, 255, 0.022) 1px, transparent 1px),
    linear-gradient(180deg, rgba(255, 255, 255, 0.022) 1px, transparent 1px);
  background-size: 96px 96px;
  pointer-events: none;
  mask-image: radial-gradient(ellipse 80% 60% at center, rgba(0,0,0,0.8) 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at center, rgba(0,0,0,0.8) 30%, transparent 80%);
  z-index: 1;
}

/* Diamond / chevron corner decorations */
.hero__corner {
  position: absolute;
  width: clamp(120px, 14vw, 200px);
  height: clamp(120px, 14vw, 200px);
  color: var(--color-gold);
  pointer-events: none;
  z-index: 1;
}

.hero__corner--tl { top: 0; left: 0; }
.hero__corner--tr { top: 0; right: 0; }
.hero__corner--bl { bottom: 0; left: 0; }
.hero__corner--br { bottom: 0; right: 0; }

.hero__container {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: 980px;
  margin: 0 auto;
  padding: 0 var(--container-padding);
  text-align: center;
}

.hero__title {
  font-family: var(--font-serif-ja);
  font-size: clamp(40px, 6vw, 72px);
  font-weight: var(--fw-bold);
  line-height: 1.35;
  letter-spacing: 0.1em;
  color: var(--color-white);
  margin-bottom: 30px;
}

.hero__title-gold {
  color: var(--color-gold);
  display: inline-block;
  padding: 0 0.05em;
  font-weight: var(--fw-bold);
}

.hero__sub {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin-bottom: 36px;
}

.hero__sub-line {
  flex-shrink: 0;
  width: clamp(28px, 4vw, 56px);
  height: 1px;
  background: var(--color-gold);
}

.hero__sub-text {
  font-family: var(--font-serif-ja);
  font-size: clamp(18px, 2.2vw, 26px);
  font-weight: var(--fw-medium);
  color: var(--color-gold);
  letter-spacing: 0.18em;
  line-height: 1.5;
}

.hero__lead {
  font-family: var(--font-sans-ja);
  font-size: var(--fs-md);
  line-height: 2.2;
  color: rgba(255, 255, 255, 0.82);
  margin-bottom: 44px;
  letter-spacing: 0.1em;
}

.hero__cta {
  display: flex;
  gap: 24px;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
}

.hero__cta .btn {
  min-width: 280px;
}

/* Scroll indicator */
.hero__scroll {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  color: rgba(255, 255, 255, 0.5);
  z-index: 3;
  transition: color var(--transition-fast);
}

.hero__scroll-label {
  font-family: var(--font-serif-en);
  font-size: 10px;
  letter-spacing: 0.36em;
  text-transform: uppercase;
}

.hero__scroll-line {
  position: relative;
  width: 1px;
  height: 36px;
  background: rgba(255, 255, 255, 0.18);
  overflow: hidden;
}

.hero__scroll-line::after {
  content: "";
  position: absolute;
  top: -20px;
  left: 0;
  width: 1px;
  height: 20px;
  background: var(--color-gold);
  animation: scrollLine 2.4s var(--ease-in-out) infinite;
}

.hero__scroll:hover { color: var(--color-gold); }

@keyframes scrollLine {
  0% { top: -20px; }
  100% { top: 36px; }
}

/* ── Services Intro (top page) ─────────────────────────── */
.services-intro { padding-top: 140px; padding-bottom: 140px; }

.services-headline {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 96px;
  align-items: end;
  margin-bottom: 96px;
  padding-bottom: 56px;
  border-bottom: 1px solid var(--color-border-soft);
}

.services-headline__title {
  font-family: var(--font-serif-ja);
  font-size: clamp(32px, 4.5vw, 52px);
  font-weight: var(--fw-bold);
  color: var(--color-navy);
  letter-spacing: 0.08em;
  line-height: 1.4;
}

.services-headline__title span { color: var(--color-gold); }

.services-headline__lead {
  font-size: var(--fs-md);
  line-height: 2.1;
  color: var(--color-text-light);
  letter-spacing: 0.05em;
  padding-bottom: 12px;
}

.services-stack {
  list-style: none;
  display: flex;
  flex-direction: column;
}

.service-item {
  border-top: 1px solid var(--color-border-soft);
}

.service-item:last-child {
  border-bottom: 1px solid var(--color-border-soft);
}

.service-item__link {
  display: grid;
  grid-template-columns: 80px 340px 1fr auto;
  gap: 56px;
  align-items: center;
  padding: 56px 16px;
  color: inherit;
  position: relative;
  transition: background-color var(--transition-base), padding-left var(--transition-base);
}

.service-item__link::after {
  content: "";
  position: absolute;
  left: 16px;
  bottom: 0;
  width: 0;
  height: 1px;
  background: var(--color-gold);
  transition: width var(--transition-slow);
}

.service-item__link:hover {
  padding-left: 36px;
  background-color: rgba(200, 168, 74, 0.04);
}

.service-item__link:hover::after { width: calc(100% - 32px); }

.service-item__num {
  font-family: var(--font-serif-en);
  font-size: 44px;
  font-weight: var(--fw-semibold);
  color: var(--color-gold);
  letter-spacing: 0.02em;
  line-height: 1;
}

.service-item__head {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.service-item__title {
  font-family: var(--font-serif-ja);
  font-size: clamp(22px, 2.4vw, 30px);
  font-weight: var(--fw-bold);
  color: var(--color-navy);
  letter-spacing: 0.12em;
  line-height: 1.4;
}

.service-item__en {
  font-family: var(--font-serif-en);
  font-size: 12px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--color-gold);
  font-weight: var(--fw-medium);
}

.service-item__text {
  font-size: var(--fs-base);
  line-height: 2;
  color: var(--color-text-light);
  letter-spacing: 0.04em;
}

.service-item__more {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  font-family: var(--font-serif-en);
  font-size: 12px;
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: var(--color-text-muted);
  font-weight: var(--fw-medium);
  transition: color var(--transition-base);
  white-space: nowrap;
}

.service-item__more::after {
  content: "→";
  font-family: var(--font-sans-en);
  transition: transform var(--transition-base);
}

.service-item__link:hover .service-item__more { color: var(--color-gold); }
.service-item__link:hover .service-item__more::after { transform: translateX(8px); }

@media screen and (max-width: 992px) {
  .services-headline { grid-template-columns: 1fr; gap: 32px; margin-bottom: 64px; }
  .service-item__link {
    grid-template-columns: 60px 1fr;
    grid-template-rows: auto auto auto;
    gap: 24px 28px;
    padding: 40px 16px;
  }
  .service-item__num { grid-row: span 3; align-self: start; padding-top: 4px; font-size: 36px; }
  .service-item__head { grid-column: 2; }
  .service-item__text { grid-column: 2; }
  .service-item__more { grid-column: 2; justify-self: start; }
}

@media screen and (max-width: 480px) {
  .services-intro { padding-top: 80px; padding-bottom: 80px; }
  .service-item__link { padding: 32px 8px; gap: 18px 20px; }
  .service-item__title { font-size: 22px; }
}

/* ── About Intro ───────────────────────────────────────── */
.about-intro {
  padding-top: 140px;
  padding-bottom: 140px;
}

.about-intro__body {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 96px;
  align-items: start;
  margin-bottom: 56px;
}

.about-intro__lead {
  font-family: var(--font-serif-ja);
  font-size: clamp(28px, 3.6vw, 44px);
  font-weight: var(--fw-bold);
  color: var(--color-navy);
  line-height: 1.55;
  letter-spacing: 0.1em;
  padding-top: 8px;
  position: relative;
}

.about-intro__text {
  font-size: var(--fs-md);
  line-height: 2.15;
  color: var(--color-text-light);
  letter-spacing: 0.05em;
  padding-top: 16px;
}

.about-intro__cta { padding-left: 4px; }

.about-intro__visual {
  position: relative;
  margin: 0 0 56px;
  min-height: clamp(280px, 42vw, 520px);
  overflow: hidden;
  border: 1px solid var(--color-border-soft);
  background: var(--color-navy);
  box-shadow: var(--shadow-lg);
}

.about-intro__visual::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(8, 20, 39, 0.04) 0%, rgba(8, 20, 39, 0.72) 100%),
    linear-gradient(90deg, rgba(8, 20, 39, 0.18) 0%, transparent 48%, rgba(8, 20, 39, 0.12) 100%);
  z-index: 1;
  pointer-events: none;
}

.about-intro__visual::after {
  content: "";
  position: absolute;
  inset: 24px;
  border: 1px solid rgba(200, 168, 74, 0.34);
  z-index: 2;
  pointer-events: none;
}

.about-intro__visual img {
  width: 100%;
  height: 100%;
  min-height: inherit;
  object-fit: cover;
  object-position: center;
  filter: saturate(0.92) contrast(1.04);
}

.about-intro__visual-caption {
  position: absolute;
  left: clamp(28px, 5vw, 64px);
  bottom: clamp(28px, 5vw, 56px);
  z-index: 3;
  color: var(--color-white);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.about-intro__visual-caption span {
  font-family: var(--font-serif-en);
  font-size: var(--fs-xs);
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: var(--color-gold);
  font-weight: var(--fw-medium);
}

.about-intro__visual-caption strong {
  font-family: var(--font-serif-ja);
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1.5;
  letter-spacing: 0.08em;
  font-weight: var(--fw-bold);
}

/* ── Link arrow (text link with arrow) ─────────────────── */
.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 16px;
  font-family: var(--font-sans-ja);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  letter-spacing: var(--tracking-wider);
  color: var(--color-navy);
  padding-bottom: 6px;
  border-bottom: 1px solid var(--color-navy);
  transition: gap var(--transition-base), color var(--transition-base), border-color var(--transition-base);
}

.link-arrow__icon {
  font-family: var(--font-sans-en);
  font-size: 14px;
  transition: transform var(--transition-base);
}

.link-arrow:hover {
  gap: 24px;
  color: var(--color-gold);
  border-color: var(--color-gold);
}

.link-arrow:hover .link-arrow__icon { transform: translateX(6px); }

.section--navy .link-arrow,
.section--navy-deep .link-arrow {
  color: var(--color-white);
  border-color: rgba(255, 255, 255, 0.4);
}

.section--navy .link-arrow:hover,
.section--navy-deep .link-arrow:hover {
  color: var(--color-gold);
  border-color: var(--color-gold);
}

/* Service card styles moved to components.css (used across pages) */

/* ── Clients / Reasons / Front-CTA headlines ──────────── */
.clients-headline,
.reasons-headline,
.front-cta__headline {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 96px;
  align-items: end;
  margin-bottom: 80px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--color-border-soft);
}

.section--navy-deep .front-cta__headline {
  border-bottom-color: rgba(255, 255, 255, 0.1);
}

.clients-headline__title,
.reasons-headline__title,
.front-cta__title {
  font-family: var(--font-serif-ja);
  font-size: clamp(28px, 4.2vw, 48px);
  font-weight: var(--fw-bold);
  color: var(--color-navy);
  letter-spacing: 0.1em;
  line-height: 1.4;
}

.section--navy-deep .front-cta__title { color: var(--color-white); }

.reasons-headline__title span,
.front-cta__title span { color: var(--color-gold); }

.clients-headline__lead,
.front-cta__lead {
  font-size: var(--fs-md);
  line-height: 2.1;
  color: var(--color-text-light);
  letter-spacing: 0.05em;
  padding-bottom: 8px;
}

.section--navy-deep .front-cta__lead { color: rgba(255, 255, 255, 0.7); }

/* ── AI Feature ────────────────────────────────────────── */
.ai-feature {
  position: relative;
  overflow: hidden;
}

.ai-feature__grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 80px;
  align-items: center;
}

.ai-feature__title {
  font-family: var(--font-serif-ja);
  font-size: var(--fs-h1);
  line-height: 1.3;
  letter-spacing: 0.08em;
  margin-bottom: 24px;
  color: var(--color-white);
}

.ai-feature__title-gold { color: var(--color-gold); }

.ai-feature__subtitle {
  font-family: var(--font-serif-ja);
  font-size: var(--fs-md);
  color: rgba(255, 255, 255, 0.7);
  letter-spacing: 0.16em;
  margin-bottom: 32px;
}

.ai-feature__lead {
  font-size: var(--fs-md);
  line-height: 2.1;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 48px;
  letter-spacing: 0.06em;
}

.ai-feature__price-card {
  position: relative;
}

.ai-feature__price-frame {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(200, 168, 74, 0.3);
  padding: 56px 48px;
  position: relative;
  text-align: center;
}

.ai-feature__price-frame::before,
.ai-feature__price-frame::after {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  border: 1px solid var(--color-gold);
}

.ai-feature__price-frame::before {
  top: -1px;
  left: -1px;
  border-right: none;
  border-bottom: none;
}

.ai-feature__price-frame::after {
  bottom: -1px;
  right: -1px;
  border-left: none;
  border-top: none;
}

.ai-feature__price-label {
  font-family: var(--font-serif-en);
  font-size: var(--fs-xs);
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: var(--color-gold);
  margin-bottom: 16px;
}

.ai-feature__price-value {
  font-family: var(--font-serif-en);
  font-size: clamp(48px, 6vw, 64px);
  color: var(--color-white);
  letter-spacing: 0.02em;
  line-height: 1;
  font-weight: var(--fw-semibold);
  margin-bottom: 12px;
}

.ai-feature__price-value span {
  font-size: 0.6em;
  margin-right: 4px;
  color: var(--color-gold);
}

.ai-feature__price-value small {
  font-family: var(--font-sans-ja);
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
  margin-left: 8px;
  font-weight: var(--fw-regular);
  letter-spacing: var(--tracking-wide);
}

.ai-feature__price-period {
  font-family: var(--font-sans-ja);
  font-size: var(--fs-sm);
  color: rgba(255, 255, 255, 0.6);
  letter-spacing: var(--tracking-wider);
  margin-bottom: 36px;
  padding-bottom: 24px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.ai-feature__points {
  display: flex;
  flex-direction: column;
  gap: 12px;
  text-align: left;
}

.ai-feature__points li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: var(--fs-sm);
  color: rgba(255, 255, 255, 0.85);
  letter-spacing: 0.04em;
}

.ai-feature__check {
  color: var(--color-gold);
  font-size: 14px;
}

/* Client card and Reason styles moved to components.css */

.reasons-section__cta {
  text-align: center;
  margin-top: 64px;
}

/* ── Front CTA ─────────────────────────────────────────── */
.contact-methods {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.contact-method {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 48px 24px;
  text-align: center;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--color-white);
  position: relative;
  overflow: hidden;
  transition: background-color var(--transition-base), border-color var(--transition-base), transform var(--transition-base);
}

.contact-method::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 70%, rgba(200, 168, 74, 0.08) 100%);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.contact-method:hover {
  border-color: var(--color-gold);
  transform: translateY(-4px);
}

.contact-method:hover::after { opacity: 1; }

.contact-method__icon {
  width: 44px;
  height: 44px;
  color: var(--color-gold);
  margin-bottom: 24px;
  position: relative;
  z-index: 1;
}

.contact-method__icon svg {
  width: 100%;
  height: 100%;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5;
}

.contact-method__label {
  font-family: var(--font-serif-en);
  font-size: var(--fs-xs);
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: var(--color-gold);
  margin-bottom: 12px;
  position: relative;
  z-index: 1;
}

.contact-method__title {
  font-family: var(--font-serif-ja);
  font-size: var(--fs-h4);
  font-weight: var(--fw-bold);
  color: var(--color-white);
  margin-bottom: 8px;
  letter-spacing: 0.06em;
  position: relative;
  z-index: 1;
}

.contact-method__hint {
  font-size: var(--fs-xs);
  color: rgba(255, 255, 255, 0.5);
  letter-spacing: var(--tracking-wider);
  position: relative;
  z-index: 1;
}

/* ── Responsive ────────────────────────────────────────── */
@media screen and (max-width: 992px) {
  .hero { min-height: 84vh; padding: 150px 0 100px; }
  .hero__corner { width: 110px; height: 110px; }

  .about-intro__body { grid-template-columns: 1fr; gap: 32px; }
  .about-intro__lead::before { display: none; }
  .clients-headline,
  .reasons-headline,
  .front-cta__headline { grid-template-columns: 1fr; gap: 24px; padding-bottom: 32px; margin-bottom: 56px; }

  .ai-feature__grid { grid-template-columns: 1fr; gap: 56px; }
  .contact-methods { grid-template-columns: 1fr; }
}

@media screen and (max-width: 768px) {
  .hero { padding: 130px 0 90px; min-height: auto; }
  .hero::after {
    background-position: 54% center;
    opacity: 0.48;
  }
  .hero__corner { width: 80px; height: 80px; }
  .hero__title { letter-spacing: 0.08em; }
  .hero__sub-line { width: 22px; }
  .hero__sub { gap: 12px; margin-bottom: 36px; }
  .hero__sub-text {
    font-size: 16px;
    letter-spacing: 0.12em;
    white-space: nowrap;
  }
  .hero__lead { line-height: 2.0; font-size: 14px; }
  .hero__cta { flex-direction: column; gap: 14px; }
  .hero__cta .btn { width: 100%; min-width: 0; max-width: 360px; }
  .hero__scroll { bottom: 24px; }

  .service-card { padding: 48px 32px; }
  .ai-feature__price-frame { padding: 40px 28px; }
  .about-intro__visual {
    min-height: 360px;
    margin-bottom: 40px;
  }
  .about-intro__visual::after { inset: 16px; }
  .about-intro__visual-caption {
    left: 28px;
    right: 28px;
    bottom: 32px;
  }
}

@media screen and (max-width: 480px) {
  .hero__corner { width: 64px; height: 64px; }
}