/* ===== 基本設定（ダークモード） ===== */
:root {
  --color-bg: #0d0e11;
  --color-surface: #16181d;
  --color-surface-2: #1c1f25;
  --color-border: rgba(255, 255, 255, 0.08);
  --color-border-strong: rgba(255, 255, 255, 0.18);
  --color-text: #eceef2;
  --color-muted: #9aa1ad;
  --color-accent: #ff7a3d;
  --color-on-accent: #16100c;
  --color-error: #ff6b6b;
  --radius: 16px;
  --header-height: 72px;
  color-scheme: dark;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  margin: 0;
  font-family: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic", Meiryo, sans-serif;
  font-weight: 400;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

h1, h2, h3 {
  line-height: 1.4;
  margin: 0;
  font-weight: 700;
}

.container {
  width: min(1120px, 100% - 32px);
  margin-inline: auto;
}

.container--narrow {
  width: min(760px, 100% - 32px);
}

.sp-only {
  display: none;
}

/* ===== ボタン ===== */
.btn {
  display: inline-block;
  padding: 14px 32px;
  border: 1px solid var(--color-accent);
  border-radius: 999px;
  background: var(--color-accent);
  color: var(--color-on-accent);
  font-weight: 700;
  font-size: 1rem;
  font-family: inherit;
  text-align: center;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}

.btn:hover {
  background: #ff915e;
  border-color: #ff915e;
}

.btn--ghost {
  background: transparent;
  border-color: var(--color-border-strong);
  color: var(--color-text);
}

.btn--ghost:hover {
  background: transparent;
  border-color: var(--color-text);
}

.btn--small {
  padding: 8px 20px;
  font-size: 0.9rem;
}

.btn--block {
  width: 100%;
}

/* ===== ヘッダー ===== */
.header {
  position: fixed;
  inset: 0 0 auto;
  height: var(--header-height);
  z-index: 100;
  background: rgba(13, 14, 17, 0.75);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s;
}

.header.is-scrolled {
  border-bottom-color: var(--color-border);
}

.header__inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 1.3rem;
  font-weight: 900;
  letter-spacing: 0.02em;
}

.logo span {
  color: var(--color-accent);
  margin-left: 2px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 32px;
  font-size: 0.9rem;
  font-weight: 500;
}

.nav a:not(.btn) {
  color: var(--color-muted);
  transition: color 0.2s;
}

.nav a:not(.btn):hover {
  color: var(--color-text);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: none;
  background: none;
  cursor: pointer;
  position: relative;
}

.nav-toggle span {
  position: absolute;
  left: 10px;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: transform 0.3s, opacity 0.3s;
}

.nav-toggle span:nth-child(1) { top: 14px; }
.nav-toggle span:nth-child(2) { top: 21px; }
.nav-toggle span:nth-child(3) { top: 28px; }

.nav-toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2) { opacity: 0; }
.nav-toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== ヒーロー（パララックス） ===== */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding: calc(var(--header-height) + 48px) 0 96px;
  overflow: hidden;
}

.hero__layer {
  position: absolute;
  pointer-events: none;
  will-change: transform;
}

/* 方眼の線 */
.hero__grid {
  inset: -20% 0;
  background-image:
    linear-gradient(var(--color-border) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-border) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(ellipse at 70% 40%, #000 0%, transparent 65%);
  mask-image: radial-gradient(ellipse at 70% 40%, #000 0%, transparent 65%);
}

/* ぼんやり光る円 */
.hero__glow {
  width: 560px;
  height: 560px;
  top: 10%;
  right: -120px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 122, 61, 0.28) 0%, transparent 70%);
}

/* 背景の大きな文字 */
.hero__word {
  right: -2vw;
  bottom: -6vw;
  font-size: 30vw;
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.04em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(255, 255, 255, 0.07);
  user-select: none;
}

.hero__inner {
  position: relative;
  z-index: 1;
  will-change: transform;
}

.hero__label {
  margin: 0 0 24px;
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--color-accent);
}

.hero__title {
  font-size: clamp(2.4rem, 6.4vw, 4.8rem);
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: 0.01em;
}

.hero__lead {
  margin: 32px 0 0;
  max-width: 600px;
  color: var(--color-muted);
  font-size: 1.05rem;
}

.hero__actions {
  margin-top: 48px;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.hero__scroll {
  position: absolute;
  left: 50%;
  bottom: 28px;
  transform: translateX(-50%);
  padding-bottom: 44px;
  font-size: 0.7rem;
  letter-spacing: 0.3em;
  color: var(--color-muted);
}

.hero__scroll::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 1px;
  height: 36px;
  background: linear-gradient(var(--color-muted), transparent);
  animation: scroll-line 2s ease-in-out infinite;
}

@keyframes scroll-line {
  0%   { transform: scaleY(0); transform-origin: top; }
  50%  { transform: scaleY(1); transform-origin: top; }
  51%  { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ===== セクション共通 ===== */
.section {
  padding: 128px 0;
}

.section--alt {
  background: #111317;
}

.section__head {
  margin-bottom: 56px;
}

.section__eyebrow {
  margin: 0 0 8px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.25em;
  color: var(--color-accent);
}

.section__title {
  font-size: clamp(1.7rem, 3.6vw, 2.4rem);
  font-weight: 900;
}

.section__lead {
  margin: 16px 0 0;
  color: var(--color-muted);
}

/* ===== ベントーグリッド ===== */
.bento {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.bento--services {
  grid-template-columns: repeat(3, 1fr);
}

.tile {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 32px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: border-color 0.3s;
}

.tile:hover {
  border-color: var(--color-border-strong);
}

.tile--wide {
  grid-column: span 2;
}

.tile--lg {
  grid-column: span 2;
  grid-row: span 2;
}

.tile--accent {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-on-accent);
}

.tile__tag {
  margin: 0 0 16px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--color-muted);
}

.tile--accent .tile__tag {
  color: rgba(22, 16, 12, 0.7);
}

.tile h3 {
  font-size: 1.2rem;
  margin-bottom: 10px;
}

.tile--lg h3 {
  font-size: clamp(1.5rem, 2.8vw, 2rem);
}

.tile p {
  margin: 0;
  color: var(--color-muted);
}

.tile__big {
  margin-top: auto !important;
  padding-top: 24px;
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px;
  color: var(--color-text) !important;
}

.tile__big span {
  font-size: clamp(3rem, 6vw, 4.5rem);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.02em;
}

.tile--lg .tile__big span {
  font-size: clamp(4rem, 9vw, 7rem);
  color: var(--color-accent);
}

.tile__big small {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-muted);
}

.tile--accent .tile__big,
.tile--accent .tile__big small {
  color: var(--color-on-accent) !important;
}

.tile__link {
  margin-top: 16px;
  font-weight: 700;
  color: var(--color-accent);
}

.tile__link:hover {
  text-decoration: underline;
}

/* ===== パララックスの帯 ===== */
.band {
  padding: 56px 0;
  overflow: hidden;
  border-block: 1px solid var(--color-border);
}

.band__text {
  margin: 0 0 0 -20%;
  white-space: nowrap;
  font-size: clamp(3rem, 9vw, 7rem);
  font-weight: 900;
  line-height: 1;
  letter-spacing: 0.02em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(255, 255, 255, 0.22);
  will-change: transform;
}

/* ===== 料金 ===== */
.plans {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  align-items: stretch;
}

.plan {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 40px 32px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.plan--featured {
  border-color: var(--color-accent);
}

.plan__badge {
  position: absolute;
  top: -13px;
  left: 32px;
  padding: 3px 14px;
  border-radius: 999px;
  background: var(--color-accent);
  color: var(--color-on-accent);
  font-size: 0.75rem;
  font-weight: 700;
  white-space: nowrap;
}

.plan__name {
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-muted);
}

.plan__price {
  margin: 8px 0 32px;
  font-size: 2.2rem;
  font-weight: 900;
  letter-spacing: -0.01em;
}

.plan__price span {
  font-size: 1rem;
  color: var(--color-muted);
}

.plan ul {
  list-style: none;
  padding: 0;
  margin: 0 0 40px;
  flex-grow: 1;
}

.plan li {
  position: relative;
  padding: 12px 0 12px 24px;
  border-top: 1px solid var(--color-border);
  font-size: 0.95rem;
}

.plan li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 50%;
  width: 6px;
  height: 6px;
  margin-top: -3px;
  border-radius: 50%;
  background: var(--color-accent);
}

/* ===== 制作の流れ ===== */
.flow {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 24px;
}

.flow li {
  padding-top: 24px;
  border-top: 1px solid var(--color-border-strong);
}

.flow span {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--color-accent);
}

.flow h3 {
  font-size: 1.05rem;
  margin: 8px 0;
}

.flow p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--color-muted);
}

/* ===== FAQ ===== */
.faq {
  border-top: 1px solid var(--color-border);
}

.faq__item {
  border-bottom: 1px solid var(--color-border);
}

.faq__item summary {
  list-style: none;
  cursor: pointer;
  padding: 24px 48px 24px 0;
  font-weight: 700;
  position: relative;
}

.faq__item summary::-webkit-details-marker {
  display: none;
}

.faq__item summary::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--color-accent);
  transition: transform 0.3s;
}

.faq__item[open] summary::after {
  transform: translateY(-50%) rotate(45deg);
}

.faq__item p {
  margin: 0;
  padding: 0 0 24px;
  color: var(--color-muted);
}

/* ===== お問い合わせ ===== */
.form {
  padding: 40px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.form__row {
  margin-bottom: 24px;
}

.form label {
  display: block;
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.form label em {
  font-style: normal;
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--color-accent);
  margin-left: 6px;
}

.form input,
.form select,
.form textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--color-border-strong);
  border-radius: 10px;
  font: inherit;
  color: var(--color-text);
  background: var(--color-bg);
  transition: border-color 0.2s;
}

.form input::placeholder,
.form textarea::placeholder {
  color: #5f6672;
}

.form input:focus,
.form select:focus,
.form textarea:focus {
  outline: none;
  border-color: var(--color-accent);
}

.form .is-invalid {
  border-color: var(--color-error);
}

.form__error {
  margin: 6px 0 0;
  font-size: 0.85rem;
  color: var(--color-error);
  min-height: 1em;
}

.form__success {
  margin: 20px 0 0;
  padding: 16px;
  border: 1px solid rgba(94, 214, 140, 0.4);
  border-radius: 10px;
  color: #7be3a3;
  font-weight: 700;
  text-align: center;
}

/* ===== フッター ===== */
.footer {
  padding: 40px 0;
  border-top: 1px solid var(--color-border);
  color: var(--color-muted);
  font-size: 0.8rem;
}

.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.footer .logo {
  color: var(--color-text);
  font-size: 1.1rem;
}

.footer p {
  margin: 0;
}

/* ===== トップへ戻る ===== */
.to-top {
  position: fixed;
  right: 20px;
  bottom: 20px;
  width: 48px;
  height: 48px;
  border: 1px solid var(--color-border-strong);
  border-radius: 50%;
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 1.1rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s, visibility 0.3s, border-color 0.2s;
  z-index: 90;
}

.to-top:hover {
  border-color: var(--color-accent);
}

.to-top.is-visible {
  opacity: 1;
  visibility: visible;
}

/* ===== スクロール表示アニメーション ===== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.is-shown {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .hero__scroll::after { animation: none; }
}

/* ===== レスポンシブ ===== */
@media (max-width: 960px) {
  .bento,
  .bento--services {
    grid-template-columns: repeat(2, 1fr);
  }

  .tile--lg {
    grid-row: span 1;
  }

  .flow {
    grid-template-columns: repeat(2, 1fr);
  }

  .plans {
    grid-template-columns: 1fr;
    max-width: 440px;
  }
}

@media (max-width: 768px) {
  .pc-only {
    display: none;
  }

  .sp-only {
    display: inline;
  }

  .nav-toggle {
    display: block;
  }

  .nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    padding: 8px 16px 24px;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-120%);
    transition: transform 0.3s;
    z-index: -1;
  }

  .nav.is-open {
    transform: translateY(0);
  }

  .nav a:not(.btn) {
    width: 100%;
    padding: 14px 0;
    border-bottom: 1px solid var(--color-border);
    text-align: center;
    color: var(--color-text);
  }

  .nav .btn {
    margin-top: 16px;
  }

  .section {
    padding: 88px 0;
  }

  .form {
    padding: 24px;
  }

  .footer__inner {
    justify-content: center;
    text-align: center;
  }
}

@media (max-width: 600px) {
  .bento,
  .bento--services,
  .flow {
    grid-template-columns: 1fr;
  }

  .tile--wide,
  .tile--lg {
    grid-column: span 1;
  }

  .tile {
    padding: 28px 24px;
  }
}