/* =============================
   Variables & Reset
============================= */
:root {
  --white:        #ffffff;
  --off-white:    #f7f7f7;
  --bg-section:   #fafafa;
  --border:       #ebebeb;
  --text:         #111111;
  --muted:        #999999;
  --accent:       #e05390;
  --accent-hover: #c0306a;
  --accent-pale:  #fdf0f5;
  --radius-sm:    8px;
  --radius:       14px;
  --radius-lg:    24px;
  --max-width:    680px;
  --transition:   0.25s ease;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: 'DM Sans', 'Noto Sans JP', 'Hiragino Kaku Gothic ProN', 'Meiryo', sans-serif;
  background: var(--white);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;   
}

img { max-width: 100%; height: auto; display: block; }
a   { color: inherit; text-decoration: none; }
ul  { list-style: none; }

/* =============================
   Page Shell
============================= */
.idx-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.idx-inner {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* =============================
   Header
============================= */
.idx-header {
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
  background: var(--white);
}

.idx-header .idx-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.idx-logo img {
  height: 30px;
  width: auto;
}

.idx-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.idx-nav a {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  transition: color var(--transition);
  position: relative;
  padding-bottom: 3px;
}

.idx-nav a::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0;
  width: 0; height: 1.5px;
  background: var(--accent);
  transition: width var(--transition);
}

.idx-nav a:hover {
  color: var(--text);
}

.idx-nav a:hover::after {
  width: 100%;
}

/* =============================
   Profile Hero
============================= */
.idx-profile {
  padding: 56px 0 40px;
  text-align: center;
}

.idx-profile-avatar {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 20px;
  border: 3px solid var(--border);
  box-shadow: 0 4px 20px rgba(0,0,0,0.06);
}

.idx-profile-name {
  font-size: 1.6rem;
  font-weight: 900;
  letter-spacing: 0.06em;
  line-height: 1.1;
  margin-bottom: 10px;
}

.idx-profile-tagline {
  font-size: 0.8rem;
  color: var(--muted);
  line-height: 2;
  letter-spacing: 0.05em;
}

.idx-social-row {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 20px;
}

.idx-social-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--white);
  color: var(--text);
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}

.idx-social-btn:hover {
  background: #111;
  border-color: #111;
  color: #fff;
}

.idx-social-btn svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

/* =============================
   Divider
============================= */
.idx-divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 0;
}

/* =============================
   Concept Section
============================= */
.idx-concept {
  padding: 52px 0;
  background: var(--white);
}

.idx-concept-label {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.3em;
  color: var(--accent);
  text-transform: uppercase;
  text-align: center;
  margin-bottom: 24px;
}

.idx-concept-body {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.idx-concept-heading {
  font-size: clamp(1.4rem, 4vw, 1.9rem);
  font-weight: 900;
  line-height: 1.4;
  text-align: center;
  letter-spacing: -0.01em;
}

.idx-concept-heading em {
  font-style: normal;
  color: var(--accent);
}

.idx-concept-text {
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 2.3;
  text-align: center;
}

/* =============================
   Banner Section
============================= */
.idx-banners {
  padding: 12px 0 56px;
  background: var(--white);
}

.idx-banners-label {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.3em;
  color: var(--muted);
  text-transform: uppercase;
  text-align: center;
  margin-bottom: 20px;
}

.idx-banner-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.idx-banner {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
  background: var(--off-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition), background var(--transition);
  cursor: pointer;
}

.idx-banner:hover {
  background: var(--white);
  border-color: var(--accent);
  box-shadow: 0 6px 28px rgba(224, 83, 144, 0.1);
  transform: translateY(-2px);
}

.idx-banner-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  object-fit: cover;
  flex-shrink: 0;
  border: 1px solid var(--border);
  background: var(--white);
}

.idx-banner-icon-svg {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
  border: 1px solid var(--border);
  background: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
}

.idx-banner-icon-svg svg {
  width: 22px;
  height: 22px;
  fill: var(--text);
}

.idx-banner-body {
  flex: 1;
  min-width: 0;
}

.idx-banner-title {
  font-size: 0.92rem;
  font-weight: 700;
  margin-bottom: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.idx-banner-desc {
  font-size: 0.74rem;
  color: var(--muted);
}
.idx-banner-desc span {
  display: inline-block;
}
.idx-banner-arrow {
  color: var(--muted);
  font-size: 0.85rem;
  flex-shrink: 0;
  transition: color var(--transition), transform var(--transition);
}

.idx-banner:hover .idx-banner-arrow {
  color: var(--accent);
  transform: translateX(3px);
}

/* Featured banner (audio works) */
.idx-banner--featured {
  background: var(--accent-pale);
  border-color: rgba(224, 83, 144, 0.25);
  padding: 20px 24px;
}

.idx-banner--featured:hover {
  background: var(--accent-pale);
  border-color: var(--accent);
}

.idx-banner--featured .idx-banner-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-sm);
}

.idx-banner--featured .idx-banner-title {
  font-size: 1rem;
  color: var(--accent);
}

/* =============================
   Footer
============================= */
.idx-footer {
  margin-top: auto;
  border-top: 1px solid var(--border);
  padding: 28px 0 32px;
  text-align: center;
  background: var(--white);
}

.idx-footer-logo {
  display: block;
  margin: 0 auto 16px;
}

.idx-footer-logo img {
  height: 24px;
  width: auto;
  margin: 0 auto;
  opacity: 0.5;
}

.idx-footer-copy {
  font-size: 0.7rem;
  color: var(--muted);
  letter-spacing: 0.08em;
}

/* =============================
   Enter / Splash Page
============================= */
.auth-body {
  background-color: var(--white);
}

.auth-page {
  position: relative;
  width: 100%;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 48px 24px;
  background-image: url('../img/index-bg.webp');
  background-attachment: fixed;
  background-size: cover;
  background-position: center;
  overflow: hidden;
}

.auth-bg-rose {
  position: absolute;
  bottom: -90px;
  right: 60px;
  width: 200px;
  pointer-events: none;
  transform: rotate(45deg);
  z-index: 0;
}

.auth-bg-rose-petal {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  max-width: 1000px;
  pointer-events: none;
  z-index: 0;
}

.auth-box {
  max-width: 400px;
  width: 100%;
  text-align: center;
  z-index: 1;
}

/* Icon */
.auth-icon {
  margin: 20px auto;
}
.auth-icon img {
  display: block;
  width: 96px;
  height: 96px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto;
  border: 2px solid var(--border);
}

/* Site name */
.auth-site-name {
  font-size: 1rem;
  font-weight: 900;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text);
  margin-bottom: 40px;
}

/* Concept block */
.auth-concept {
  margin-bottom: 48px;
}

.auth-concept img {
  width: 100%;
  height: auto;
}

/* Enter button */
.auth-enter-btn {
  display: block;
  width: 100%;
  padding: 18px 24px;
  background: transparent;
  border: 1.5px solid var(--text);
  color: var(--text);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}
.auth-enter-btn:hover {
  background: var(--text);
  color: var(--white);
}

/* =============================
   Responsive
============================= */
@media (max-width: 480px) {
  .idx-profile-avatar { width: 80px; height: 80px; }
  .idx-profile-name   { font-size: 1.3rem; }
  .idx-nav            { gap: 18px; }
  .idx-banner         { padding: 14px 16px; gap: 12px; }
  .idx-banner--featured { padding: 16px; }
  .idx-banner-icon    { width: 40px; height: 40px; }
  .idx-banner-icon-svg { width: 40px; height: 40px; }
  .idx-banner--featured .idx-banner-icon { width: 48px; height: 48px; }
  .auth-icon img { width: 80px; height: 80px; }
}