/* =====================================================
   株式会社SUMU（模倣練習サイト）— ローディング & ヒーロー
   ===================================================== */
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Noto Sans JP", "Yu Gothic", "Hiragino Sans", Meiryo, sans-serif;
  background: #14171a;
  color: #fff;
  overflow-x: hidden;
}
h1, p { margin: 0; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; margin: 0; padding: 0; }

:root {
  --ink: #14171a;
  --ink-deep: #0d0f11;
  --gold: #c9a96e;
  --gold-soft: #e3cfa0;
  --line: rgba(201, 169, 110, .28);
}

.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 clamp(16px, 4vw, 64px);
}

/* =====================================================
   ローディング画面
   ===================================================== */
.loader {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: var(--ink-deep);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity .9s ease, visibility .9s ease;
}
.loader.is-hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}
.loader-inner {
  text-align: center;
}
.loader-mark {
  width: clamp(48px, 7vw, 68px);
  height: clamp(48px, 7vw, 68px);
  margin: 0 auto clamp(14px, 2.4vw, 20px);
  color: var(--gold-soft);
  opacity: 0;
  animation: loaderFade 1s ease .1s forwards;
}
.loader-word {
  font-family: "Cormorant Garamond", serif;
  font-weight: 600;
  font-size: clamp(26px, 4vw, 38px);
  letter-spacing: .5em;
  padding-left: .5em;
  color: #fff;
  opacity: 0;
  animation: loaderFade 1s ease .3s forwards;
}
.loader-sub {
  margin-top: clamp(10px, 1.6vw, 14px);
  font-family: "Noto Sans JP", sans-serif;
  font-size: clamp(10px, 1.1vw, 12px);
  letter-spacing: .32em;
  padding-left: .32em;
  color: rgba(255, 255, 255, .45);
  opacity: 0;
  animation: loaderFade 1s ease .5s forwards;
}
@keyframes loaderFade {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* =====================================================
   ヘッダー
   ===================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 500;
  padding: clamp(16px, 2.4vw, 26px) 0;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}
.brand-mark {
  display: inline-flex;
  width: 26px;
  height: 26px;
  color: var(--gold-soft);
}
.brand-text {
  font-family: "Cormorant Garamond", serif;
  font-weight: 600;
  font-size: clamp(17px, 1.8vw, 20px);
  letter-spacing: .3em;
  padding-left: .3em;
}
.main-nav ul {
  display: flex;
  align-items: center;
  gap: clamp(18px, 2.2vw, 32px);
}
.main-nav a {
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: .1em;
  color: rgba(255, 255, 255, .82);
  position: relative;
  padding-bottom: 4px;
  white-space: nowrap;
}
.main-nav a::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 0; height: 1px;
  background: var(--gold-soft);
  transition: width .25s ease;
}
.main-nav a:hover::after { width: 100%; }
.nav-cta {
  border: 1px solid rgba(255, 255, 255, .35);
  padding: 10px 18px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}
.nav-cta::after { display: none; }
.nav-cta:hover { border-color: var(--gold-soft); color: var(--gold-soft); }

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  background: none;
  border: 1px solid rgba(255, 255, 255, .3);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 18px;
  height: 1px;
  background: #fff;
}

/* =====================================================
   ヒーロー
   ===================================================== */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--ink);
}
.hero-bg {
  position: absolute;
  inset: 0;
  color: rgba(201, 169, 110, .16);
}
.hero-bg-layer {
  position: absolute;
  inset: -10%;
}
.hero-bg-layer--1 {
  background:
    radial-gradient(circle at 72% 20%, rgba(201, 169, 110, .20), transparent 55%),
    radial-gradient(circle at 12% 85%, rgba(201, 169, 110, .10), transparent 50%),
    linear-gradient(150deg, #1c211f 0%, #12140f 55%, #0d0f11 100%);
  animation: bgDrift 22s ease-in-out infinite alternate;
}
.hero-bg-layer--2 {
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: .12;
  mask-image: radial-gradient(circle at 60% 30%, #000 0%, transparent 70%);
}
@keyframes bgDrift {
  from { transform: scale(1) translate(0, 0); }
  to   { transform: scale(1.06) translate(-1.5%, -1%); }
}
.hero-skyline {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  width: 100%;
  height: clamp(140px, 24vw, 320px);
  opacity: .5;
}
.hero-veil {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(13,15,17,.55) 0%, rgba(13,15,17,.25) 40%, rgba(13,15,17,.75) 100%);
}

.hero-inner {
  position: relative;
  z-index: 3;
  padding-top: clamp(96px, 11vw, 140px);
  padding-bottom: clamp(60px, 8vw, 90px);
}
.hero-eyebrow {
  font-size: clamp(12px, 1.2vw, 13px);
  letter-spacing: .34em;
  padding-left: .34em;
  color: var(--gold-soft);
  margin-bottom: clamp(20px, 2.6vw, 28px);
  opacity: 0;
  animation: fadeUp .9s ease .15s forwards;
}
.hero-title {
  font-family: "Noto Serif JP", serif;
  font-weight: 600;
  font-size: clamp(32px, 5.6vw, 68px);
  line-height: 1.4;
  text-wrap: balance;
}
.hero-title .line {
  display: block;
  opacity: 0;
  transform: translateY(24px);
  animation: fadeUp .9s cubic-bezier(.2,.7,.2,1) forwards;
}
.hero-title .line:nth-child(1) { animation-delay: .3s; }
.hero-title .line:nth-child(2) { animation-delay: .48s; }

.hero-en {
  margin-top: clamp(16px, 2vw, 20px);
  font-family: "Cormorant Garamond", serif;
  font-size: clamp(13px, 1.5vw, 17px);
  letter-spacing: .18em;
  color: rgba(255, 255, 255, .55);
  opacity: 0;
  animation: fadeUp .9s ease .62s forwards;
}
.hero-lead {
  margin-top: clamp(26px, 3.2vw, 36px);
  font-size: clamp(13.5px, 1.4vw, 15.5px);
  line-height: 2;
  text-wrap: pretty;
  color: rgba(255, 255, 255, .72);
  max-width: 620px;
  opacity: 0;
  animation: fadeUp .9s ease .78s forwards;
}
.hero-actions {
  margin-top: clamp(32px, 4vw, 44px);
  display: flex;
  flex-wrap: wrap;
  gap: clamp(12px, 1.6vw, 18px);
  opacity: 0;
  animation: fadeUp .9s ease .94s forwards;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 0 clamp(26px, 3vw, 36px);
  font-size: 13.5px;
  font-weight: 500;
  letter-spacing: .14em;
  transition: transform .25s ease, background .25s ease, border-color .25s ease, color .25s ease;
}
.btn-primary {
  background: var(--gold-soft);
  color: #1c1a12;
}
.btn-primary:hover { transform: translateY(-2px); background: var(--gold); }
.btn-ghost {
  border: 1px solid rgba(255, 255, 255, .35);
  color: #fff;
}
.btn-ghost:hover { border-color: var(--gold-soft); color: var(--gold-soft); }

.hero-scroll {
  position: absolute;
  left: clamp(16px, 4vw, 64px);
  bottom: clamp(22px, 3vw, 34px);
  z-index: 3;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 10px;
  letter-spacing: .24em;
  padding-left: .24em;
  color: rgba(255, 255, 255, .5);
  opacity: 0;
  animation: fadeUp .9s ease 1.1s forwards;
}
.hero-scroll-line {
  width: 40px;
  height: 1px;
  background: rgba(255, 255, 255, .4);
  position: relative;
  overflow: hidden;
}
.hero-scroll-line::after {
  content: "";
  position: absolute;
  left: -40px; top: 0;
  width: 40px; height: 1px;
  background: var(--gold-soft);
  animation: scrollLine 1.8s ease-in-out infinite;
}
@keyframes scrollLine {
  0% { left: -40px; }
  100% { left: 40px; }
}
@keyframes fadeUp {
  to { opacity: 1; transform: translateY(0); }
}

/* =====================================================
   レスポンシブ
   ===================================================== */
@media screen and (max-width: 1023px) {
  .main-nav {
    position: fixed;
    top: 0;
    right: 0;
    height: 100svh;
    width: min(78vw, 320px);
    background: var(--ink-deep);
    border-left: 1px solid var(--line);
    transform: translateX(100%);
    transition: transform .35s ease;
    display: flex;
    align-items: center;
    z-index: 600;
  }
  .main-nav.is-open { transform: translateX(0); }
  .main-nav ul {
    flex-direction: column;
    align-items: flex-start;
    gap: clamp(20px, 4vw, 28px);
    padding: 0 clamp(24px, 6vw, 40px);
    width: 100%;
  }
  .main-nav a { font-size: 14px; }
  .nav-toggle { display: flex; position: relative; z-index: 601; }
}

@media screen and (max-width: 767px) {
  .hero-scroll { display: none; }
  .hero-actions .btn { width: 100%; }
}

@media screen and (max-width: 480px) {
  .hero-inner { padding-top: 108px; }
  .hero-lead br { display: none; }
}