/* ============================================================
   Main CSS v2 — Page-level section styles
   DNA-6: ヒーロー レイヤード演出
   ============================================================ */

/* ============================================================
   FV (First View) — DNA-6
   ============================================================ */

.fv {
  position: relative;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  overflow: hidden;
  padding-block: clamp(6rem, 14vw, 10rem) clamp(4rem, 8vw, 6rem);
}

/* 背景グラデーション波アニメーション（放射状グラデ+青系） */
.fv__bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(
    ellipse 120% 100% at 60% 40%,
    #dbeafe 0%,
    #eff6ff 40%,
    #ffffff 80%
  );
  z-index: 0;
}

.fv__bg::before {
  content: "";
  position: absolute;
  inset: -50%;
  background: radial-gradient(
    ellipse 80% 60% at 70% 30%,
    rgba(59, 130, 246, 0.18) 0%,
    transparent 60%
  );
  animation: fv-wave 12s ease-in-out infinite alternate;
}

.fv__bg::after {
  content: "";
  position: absolute;
  inset: -50%;
  background: radial-gradient(
    ellipse 60% 70% at 20% 70%,
    rgba(29, 78, 216, 0.12) 0%,
    transparent 60%
  );
  animation: fv-wave 16s ease-in-out infinite alternate-reverse;
}

@keyframes fv-wave {
  0%   { transform: translate(0, 0) rotate(0deg) scale(1); }
  100% { transform: translate(4%, 4%) rotate(3deg) scale(1.06); }
}

@media (prefers-reduced-motion: reduce) {
  .fv__bg::before,
  .fv__bg::after {
    animation: none;
  }
}

/* DNA-6: 巨大背景文字（FV専用ウォーターマーク） */
.fv__watermark {
  position: absolute;
  bottom: -0.05em;
  right: -2vw;
  font-size: clamp(8rem, 22vw, 20rem);
  font-weight: 900;
  font-family: var(--font-family-sans);
  /* フォールバック (stroke 非対応ブラウザ): 薄塗で存在感を担保 */
  color: rgba(37, 99, 235, 0.07);
  -webkit-text-stroke: 3px rgba(37, 99, 235, 0.18);
  letter-spacing: -0.06em;
  white-space: nowrap;
  user-select: none;
  pointer-events: none;
  z-index: 0;
  line-height: 0.85;
}

@supports (-webkit-text-stroke: 1px currentColor) {
  .fv__watermark {
    color: transparent;
  }
}

/* DNA-6: 縦ライン装飾（rvatec top_mv_line 相当） */
.fv__line {
  display: none;
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 2px;
  height: clamp(8rem, 20vw, 16rem);
  background: linear-gradient(
    to bottom,
    transparent,
    var(--color-brand-primary-400) 30%,
    var(--color-brand-primary-400) 70%,
    transparent
  );
}

@media (min-width: 768px) {
  .fv__line {
    display: block;
  }
}

.fv__inner {
  position: relative;
  z-index: 1;
}

/* DNA-2 適用: EN eyebrow（小さく letterspaced） */
.fv__eyebrow {
  display: block;
  font-size: 0.8125rem;
  font-weight: var(--font-weight-medium);
  color: var(--color-brand-primary-600);
  letter-spacing: 0.25em;
  text-transform: uppercase;
  margin-bottom: var(--space-6);
}

/* DNA-6: 縦積み巨大タイポ */
.fv__headline {
  display: flex;
  flex-direction: column;
  font-size: clamp(2.5rem, 7vw, 5.5rem);
  font-weight: 900;
  color: var(--color-text-heading);
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-8);
  gap: 0.05em;
}

.fv__headline-row {
  display: block;
}

.fv__headline-row--accent {
  color: var(--color-brand-primary-600);
}

.fv__sub {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-10);
  line-height: var(--line-height-normal);
}

/* FV 分岐ボタン（2 つ水平・大きめ） */
.fv__branch {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  align-items: stretch;
  margin-bottom: var(--space-8);
}

@media (min-width: 640px) {
  .fv__branch {
    flex-direction: row;
    align-items: center;
    width: fit-content;
  }
}

.branch-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-5) var(--space-8);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-bold);
  border-radius: var(--radius-md);
  cursor: pointer;
  border: 2px solid transparent;
  min-height: 64px;
  justify-content: center;
  transition:
    transform var(--duration-fast) var(--easing-standard),
    box-shadow var(--duration-fast) var(--easing-standard),
    background-color var(--duration-fast);
}

.branch-btn:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-md);
}

.branch-btn--support {
  background-color: var(--color-brand-primary-600);
  color: var(--color-text-inverse);
  border-color: var(--color-brand-primary-600);
}

.branch-btn--support:hover,
.branch-btn--support[aria-expanded="true"] {
  background-color: var(--color-brand-primary-700);
}

.branch-btn--course {
  background-color: var(--color-text-inverse);
  color: var(--color-brand-primary-700);
  border-color: var(--color-brand-primary-600);
}

.branch-btn--course:hover,
.branch-btn--course[aria-expanded="true"] {
  background-color: var(--color-brand-primary-50);
}

/* FV 展開パネル — grid-template-rows: 0fr → 1fr で内容実測高さに自動追従 */
.fv__panels {
  display: block;
}

.fv-panel {
  display: grid;
  grid-template-rows: 0fr;
  overflow: hidden;
  transition:
    grid-template-rows var(--duration-slow) var(--easing-decelerate),
    opacity var(--duration-normal) var(--easing-standard);
  opacity: 0;
}

.fv-panel.is-open {
  grid-template-rows: 1fr;
  opacity: 1;
}

/* grid-template-rows のアニメに対応していない古ブラウザ向けフォールバック */
@supports not (grid-template-rows: 1fr) {
  .fv-panel {
    display: block;
    max-height: 0;
    transition: max-height var(--duration-slow) var(--easing-decelerate);
  }
  .fv-panel.is-open {
    max-height: 1200px;
  }
}

/* grid-template-rows アニメで子の overflow を制御するためのラッパー */
.fv-panel > .fv-panel__inner {
  min-height: 0;
  overflow: hidden;
}

.fv-panel__inner {
  background-color: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  margin-top: var(--space-4);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(8px);
  text-align: left;
}

.fv-panel__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-heading);
  margin-bottom: var(--space-6);
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.fv-panel__title-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background-color: var(--color-brand-primary-100);
  border-radius: var(--radius-md);
  color: var(--color-brand-primary-600);
  flex-shrink: 0;
}

.fv-panel__features {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

@media (min-width: 640px) {
  .fv-panel__features {
    grid-template-columns: repeat(3, 1fr);
  }
}

.fv-panel-feature {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.fv-panel-feature__icon {
  color: var(--color-brand-primary-500);
  font-size: 1.5rem;
  font-weight: var(--font-weight-bold);
}

.fv-panel-feature__title {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-heading);
}

.fv-panel-feature__text {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-normal);
}

/* DNA-6: Scroll Down インジケータ（縦線アニメ） */
.fv__scroll {
  position: absolute;
  bottom: var(--space-8);
  right: var(--space-8);
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
}

.fv__scroll-label {
  font-size: 0.6875rem;
  color: var(--color-text-muted);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  writing-mode: vertical-rl;
  text-orientation: mixed;
}

.fv__scroll-line {
  display: block;
  width: 1px;
  height: 0;
  background: var(--color-brand-primary-400);
  animation: scroll-line 2s ease-in-out infinite;
}

@keyframes scroll-line {
  0%   { height: 0;    opacity: 1;  transform: translateY(0); }
  50%  { height: 60px; opacity: 1;  transform: translateY(0); }
  100% { height: 60px; opacity: 0;  transform: translateY(20px); }
}

@media (prefers-reduced-motion: reduce) {
  .fv__scroll-line {
    animation: none;
    height: 60px;
  }
}

/* セクション別背景色は components.css §Section-specific background colors に統一 */

/* section__text 内のコンテンツは z-index: 1 確保 */
.section__text {
  position: relative;
  z-index: 1;
}

/* ============================================================
   Contact CTA section（大胆なダーク帯）
   ============================================================ */

.contact-cta {
  background: linear-gradient(135deg, #0F172A 0%, #1E3A8A 50%, #1D4ED8 100%);
  padding-block: clamp(5rem, 12vw, 10rem);
  text-align: center;
  position: relative;
  overflow: hidden;
}

/* DNA-1: CONTACT ウォーターマーク */
.contact-cta__watermark {
  position: absolute;
  bottom: -0.05em;
  right: -2vw;
  font-size: clamp(8rem, 20vw, 18rem);
  font-weight: 900;
  font-family: var(--font-family-sans);
  /* フォールバック (stroke 非対応): 薄い白塗で存在感を担保 */
  color: rgba(255, 255, 255, 0.05);
  -webkit-text-stroke: 3px rgba(255, 255, 255, 0.18);
  letter-spacing: -0.05em;
  white-space: nowrap;
  user-select: none;
  pointer-events: none;
  z-index: 0;
  line-height: 0.85;
  will-change: transform;
}

@supports (-webkit-text-stroke: 1px currentColor) {
  .contact-cta__watermark {
    color: transparent;
  }
}

.contact-cta > .container {
  position: relative;
  z-index: 1;
}

.contact-cta__eyebrow {
  display: block;
  font-size: 0.875rem;
  font-weight: var(--font-weight-medium);
  color: rgba(255, 255, 255, 0.6);
  letter-spacing: 0.3em;
  text-transform: uppercase;
  margin-bottom: var(--space-4);
}

.contact-cta__title {
  font-size: clamp(2rem, 5.5vw, 4rem);
  font-weight: 900;
  color: var(--color-text-inverse);
  margin-bottom: var(--space-4);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.contact-cta__sub {
  font-size: var(--font-size-lg);
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: var(--space-10);
  line-height: var(--line-height-normal);
}

.contact-cta__actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-8);
}

@media (min-width: 640px) {
  .contact-cta__actions {
    flex-direction: row;
  }
}

/* contact-cta内のprimary buttonはダーク帯なので白ボーダー付き */
.contact-cta .btn--primary {
  background-color: var(--color-brand-primary-500);
  border-color: var(--color-brand-primary-500);
}

.contact-cta .btn--primary:hover {
  background-color: var(--color-brand-primary-400);
  border-color: var(--color-brand-primary-400);
}

.contact-cta__tel {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-inverse);
  margin-bottom: var(--space-2);
}

.contact-cta__tel a {
  color: inherit;
  text-decoration: none;
}

.contact-cta__tel-label {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.6);
}

/* Utility (.text-center / .mt-* / .inline-link) は components.css に統一 */