/* 
  MVP Style: Minimal, lots of whitespace, mobile-first, modern
*/

:root {
  --bg-color: #030a16;
  --surface-color: #0b1526;
  --text-main: #ffffff;
  --text-muted: #94a3b8;
  --accent-gold: #d4af37;
  --accent-red: #e63946;
  --font-en: 'Inter', sans-serif;
  --font-ja: 'Noto Sans JP', sans-serif;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-ja);
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.8;
}

h1, h2, h3, h4, .logo-en {
  font-family: var(--font-en);
}

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

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Utilities */
.container {
  width: 100%;
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 100px 0;
}

.text-center {
  text-align: center;
}

.text-accent {
  color: var(--accent-gold);
}

.section-title {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 24px;
  letter-spacing: 1px;
}

.section-desc {
  color: var(--text-muted);
  margin-bottom: 40px;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 12px 32px;
  border-radius: 4px;
  font-weight: 600;
  text-align: center;
  transition: opacity 0.3s;
  cursor: pointer;
}

.btn:hover {
  opacity: 0.8;
}

.btn-primary {
  background-color: var(--accent-gold);
  color: #000;
  border: none;
  font-family: inherit;
  font-size: 1rem;
}

.btn-outline {
  border: 1px solid var(--text-main);
  color: var(--text-main);
}

/* Header */
.header {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(3, 10, 22, 0.9);
  backdrop-filter: blur(10px);
  z-index: 100;
  border-bottom: 1px solid rgba(255,255,255,0.05);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
  max-width: 1200px;
  margin: 0 auto;
}

.logo {
  display: flex;
  flex-direction: column;
}

.logo-en { font-size: 1.2rem; font-weight: 800; letter-spacing: 2px; }
.logo-ja { font-size: 0.7rem; color: var(--text-muted); }

/* Hamburger Menu (Mobile) */
.hamburger {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  width: 24px;
  height: 18px;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 1000;
  padding: 0;
}

.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--text-main);
  transition: transform 0.3s ease, opacity 0.3s ease, background-color 0.3s;
  border-radius: 2px;
}

/* Hamburger Active State */
.hamburger.is-active span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
  background-color: var(--accent-gold);
}
.hamburger.is-active span:nth-child(2) {
  opacity: 0;
}
.hamburger.is-active span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
  background-color: var(--accent-gold);
}

/* Mobile Nav Menu */
.nav-menu {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background: rgba(3, 10, 22, 0.98); /* Deep navy base, high opacity */
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 32px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
  z-index: 999;
  backdrop-filter: blur(10px);
}

.nav-menu.is-active {
  opacity: 1;
  pointer-events: auto;
}

.nav-menu a {
  font-size: 1.25rem;
  font-family: var(--font-en);
  color: var(--text-main);
  font-weight: 600;
  transition: color 0.3s;
}

.nav-menu a:hover {
  color: var(--accent-gold);
}

.nav-contact-btn {
  color: var(--accent-gold) !important;
}

@media (min-width: 992px) {
  .hamburger {
    display: none;
  }
  .nav-menu {
    position: static;
    height: auto;
    width: auto;
    background: transparent;
    flex-direction: row;
    gap: 24px;
    opacity: 1;
    pointer-events: auto;
    backdrop-filter: none;
  }
  .nav-menu a {
    font-size: 0.9rem;
  }
  .nav-contact-btn {
    border: 1px solid var(--accent-gold);
    padding: 6px 16px;
    border-radius: 4px;
  }
}

/* Hero */
.hero {
  height: 100vh;
  min-height: 600px;
  display: flex;
  align-items: center;
  padding: 0 24px;
  position: relative;
}

.hero-bg {
  position: absolute;
  top: 0; left: 0; width: 100%; height: 100%;
  background-color: var(--surface-color);
  /* スマホ用Hero画像 (縦長の画像を想定) */
  background-image: url('./assets/hero_sp.jpg');
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center center; 
  opacity: 0.4;
  z-index: -1;
}

/* PC以上の画面幅でのみ適用されるHero画像 */
@media (min-width: 768px) {
  .hero-bg {
    /* PC用Hero画像 (横長のスタジオ写真等を想定) */
    background-image: url('./assets/hero_pc.jpg');
    /* 演奏中の顔が右側にある場合など、見切れを防ぐ調整 */
    background-position: 70% center;
  }
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
  width: 100%;
}

.hero-label {
  color: var(--accent-gold);
  font-family: var(--font-en);
  letter-spacing: 2px;
  font-size: 0.9rem;
  margin-bottom: 16px;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 24px;
}

.hero-desc {
  color: var(--text-muted);
  margin-bottom: 40px;
  font-size: 1.1rem;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* About */
.about-grid {
  display: grid;
  gap: 40px;
}

@media (min-width: 768px) {
  .about-grid { grid-template-columns: 1fr 1fr; align-items: center; }
}

.about-text p {
  color: var(--text-muted);
  margin-bottom: 24px;
}

.about-name {
  font-size: 1.5rem;
  margin-bottom: 24px;
}

.about-image img {
  width: 100%;
  height: auto;
  border-radius: 8px; /* デザインに合わせた角丸 */
  object-fit: cover;
  /* 頭上のトランペットと顔が綺麗に収まるよう、少し上寄りに調整 */
  object-position: center 15%;
  background-color: var(--surface-color); /* 読み込み前や画像がない時のプレースホルダー色 */
  min-height: 200px;
}

.achievement-badge {
  display: inline-flex;
  flex-direction: column;
  border-left: 3px solid var(--accent-gold);
  padding-left: 16px;
  margin-top: 16px;
}

.badge-title {
  font-family: var(--font-en);
  font-weight: 700;
  color: var(--text-main);
}

.badge-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Why Saku? */
.grid-why {
  display: grid;
  gap: 24px;
}
@media (min-width: 768px) {
  .grid-why { grid-template-columns: repeat(3, 1fr); }
}

.why-card {
  padding: 28px 24px;
  text-align: left;
}

@media (min-width: 768px) {
  .why-card {
    padding: 40px 32px;
    text-align: center;
  }
}

.why-number {
  font-family: var(--font-en);
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent-gold);
  opacity: 0.3;
  line-height: 1;
  margin-bottom: 16px;
}

@media (min-width: 768px) {
  .why-number {
    font-size: 2.5rem;
    margin-bottom: 24px;
  }
}

.why-title {
  font-size: 1.1rem;
  margin-bottom: 16px;
}

.why-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* Featured Video */
.featured-video {
  width: 100%;
  aspect-ratio: 16/9;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,0.05);
  background: #000;
}

.featured-video iframe {
  width: 100%;
  height: 100%;
  border: none;
  display: block;
}

/* Works & Grids */
.grid-works {
  display: grid;
  gap: 24px;
}
@media (min-width: 768px) {
  .grid-works { grid-template-columns: repeat(2, 1fr); }
}

.card {
  background: var(--surface-color);
  border-radius: 8px;
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  border: 1px solid rgba(255,255,255,0.05);
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(0,0,0,0.5);
  border-color: rgba(212,175,55,0.3);
}

.card-img {
  height: 200px;
  width: 100%;
  object-fit: cover;
  display: block;
  background-color: #0b1526; /* 画像ロード前のプレースホルダー色 */
}

.card-body {
  padding: 32px 24px;
  flex: 1;
}

.card-tag {
  color: var(--accent-gold);
  font-size: 0.8rem;
  font-family: var(--font-en);
  margin-bottom: 12px;
  display: block;
}

.card-body h3 {
  margin-bottom: 12px;
  font-size: 1.25rem;
}
.card-body p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* Services */
.service-list-container {
  max-width: 900px;
  margin: 0 auto;
  background: var(--surface-color);
  border: 1px solid rgba(255,255,255,0.05);
  border-radius: 8px;
  padding: 32px 24px;
}

@media (min-width: 768px) {
  .service-list-container {
    padding: 48px;
  }
}

.service-list {
  list-style: none;
  margin: 0 auto;
  display: grid;
  gap: 16px;
  max-width: 600px;
}

@media (min-width: 600px) {
  .service-list { grid-template-columns: 1fr 1fr; }
}

.service-list li {
  display: flex;
  align-items: center;
  gap: 12px;
}

.service-list li::before {
  content: '';
  display: block;
  width: 6px;
  height: 6px;
  background: var(--accent-gold);
  border-radius: 50%;
}

/* Service Details Grid */
.service-details-grid {
  display: grid;
  gap: 24px;
  margin-top: 40px;
  padding-top: 40px;
  border-top: 1px solid rgba(255,255,255,0.05);
}

@media (min-width: 768px) {
  .service-details-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

.service-detail-card {
  background: rgba(255,255,255,0.02);
  padding: 24px;
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,0.03);
}

.service-detail-title {
  font-size: 1.1rem;
  margin-bottom: 16px;
  color: var(--text-main);
  line-height: 1.5;
}

.service-detail-text {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 16px;
}

.service-detail-list {
  list-style: none;
}

.service-detail-list li {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 8px;
  display: flex;
  align-items: flex-start;
  gap: 8px;
  line-height: 1.5;
}

.service-detail-list li::before {
  content: '・';
  color: var(--accent-gold);
  font-weight: bold;
}

/* Lesson Block */
.lesson-container {
  max-width: 900px;
  margin: 40px auto 0;
  background: var(--surface-color);
  border: 1px solid rgba(255,255,255,0.05);
  border-radius: 8px;
  padding: 32px 24px;
}

@media (min-width: 768px) {
  .lesson-container {
    padding: 48px;
  }
}

.lesson-grid {
  display: grid;
  gap: 24px;
  margin-top: 32px;
}

@media (min-width: 600px) {
  .lesson-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

.lesson-info {
  background: rgba(255,255,255,0.02);
  padding: 24px;
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,0.03);
  text-align: center;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.lesson-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 8px;
  letter-spacing: 1px;
}

.lesson-value {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--text-main);
}

.lesson-value.text-accent {
  color: var(--accent-gold);
}

.lesson-note {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Live */
.live-list { list-style: none; max-width: 800px; margin: 0 auto; }
.live-row {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 24px 0;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

@media (min-width: 768px) {
  .live-row {
    flex-direction: row;
    gap: 40px;
    align-items: center;
  }
}

.live-date {
  font-family: var(--font-en);
  color: var(--accent-gold);
  font-weight: 600;
  min-width: 120px;
}

/* Contact */
.contact-form {
  max-width: 600px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.contact-form input,
.contact-form select,
.contact-form textarea {
  width: 100%;
  padding: 16px;
  background: var(--surface-color);
  border: 1px solid rgba(255,255,255,0.1);
  color: var(--text-main);
  font-family: inherit;
}

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

.social-links {
  display: flex;
  justify-content: center;
  gap: 24px;
  font-family: var(--font-en);
}

.social-links a {
  color: var(--text-muted);
  transition: color 0.3s;
}

.social-links a:hover {
  color: var(--accent-gold);
}

/* Footer */
.footer {
  text-align: center;
  padding: 40px;
  border-top: 1px solid rgba(255,255,255,0.05);
  color: var(--text-muted);
  font-size: 0.8rem;
}

/* -----------------------------
   Featured Music / Video Layout
   ----------------------------- */
.featured-video-grid {
  display: grid;
  gap: 24px;
  max-width: 1000px;
  margin: 0 auto;
}

@media (min-width: 768px) {
  .featured-video-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.featured-video {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0,0,0,0.5);
  background: var(--surface-color);
}

.featured-video iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}