/*
 * 宵雨あむ ランディングページ — スタイルシート
 * Design: 「雨窓の詩」Art Nouveau × Digital Melancholy
 * Color: Midnight Indigo #1a1033 / Rain-Window Violet #6b4fa0 / Soft Glow Lavender #c4a8e8
 *        Raindrop Blue #4a7fa5 / Amber Memory #d4956a / Fog White #e8e4f0
 * Font: Noto Serif JP (heading) / Zen Kaku Gothic New (body) / Cormorant Garamond (en deco)
 * Easing: --ease-out: cubic-bezier(0.23, 1, 0.32, 1)
 */

/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --midnight: #0d0820;
  --indigo: #1a1033;
  --violet: #6b4fa0;
  --violet-light: #8b6fc0;
  --lavender: #c4a8e8;
  --lavender-dim: rgba(196,168,232,0.6);
  --blue: #4a7fa5;
  --amber: #d4956a;
  --fog: #e8e4f0;
  --fog-dim: rgba(232,228,240,0.7);
  --glass: rgba(26,16,51,0.7);
  --glass-border: rgba(196,168,232,0.2);
  --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
  --ease-in-out: cubic-bezier(0.77, 0, 0.175, 1);
}

html { scroll-behavior: smooth; }

body {
  background-color: var(--midnight);
  color: var(--fog);
  font-family: 'Zen Kaku Gothic New', 'Noto Sans JP', sans-serif;
  font-weight: 300;
  line-height: 1.8;
  overflow-x: hidden;
}

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

/* ===== RAIN CANVAS ===== */
#rain-canvas {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  z-index: 1;
  opacity: 0.18;
}

/* ===== HERO ===== */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('https://d2xsxph8kpxj0f.cloudfront.net/310519663293501047/LAjFxcChkHDo7CViN3QoVp/amu_lp_hero-Kq43SsFjsA5KL6Sqc4LPdM.webp');
  background-size: cover;
  background-position: center;
  transform: scale(1.04);
  transition: transform 8s ease-out;
  z-index: 0;
}
.hero-bg.loaded { transform: scale(1); }

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    105deg,
    rgba(13,8,32,0.88) 0%,
    rgba(26,16,51,0.72) 45%,
    rgba(26,16,51,0.2) 100%
  );
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  padding: clamp(2rem, 8vw, 8rem) clamp(1.5rem, 6vw, 7rem);
  max-width: 640px;
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.9s var(--ease-out), transform 0.9s var(--ease-out);
}
.hero-content.visible { opacity: 1; transform: translateY(0); }

.hero-en {
  font-family: 'Cormorant Garamond', serif;
  font-size: clamp(0.75rem, 1.5vw, 0.9rem);
  letter-spacing: 0.22em;
  color: var(--lavender-dim);
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.hero-title {
  font-family: 'Noto Serif JP', serif;
  font-size: clamp(3rem, 8vw, 5.5rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--fog);
  letter-spacing: -0.01em;
  margin-bottom: 1rem;
  text-shadow: 0 2px 40px rgba(107,79,160,0.5);
}

.hero-tagline {
  font-family: 'Noto Serif JP', serif;
  font-size: clamp(0.9rem, 2vw, 1.1rem);
  color: var(--lavender);
  letter-spacing: 0.08em;
  margin-bottom: 1.5rem;
  font-style: italic;
}

.hero-desc {
  font-size: clamp(0.85rem, 1.8vw, 1rem);
  color: var(--fog-dim);
  line-height: 2;
  margin-bottom: 2.5rem;
}

.hero-cta {
  display: inline-block;
  padding: 0.85em 2.2em;
  border: 1px solid var(--amber);
  color: var(--amber);
  font-family: 'Noto Serif JP', serif;
  font-size: 0.9rem;
  letter-spacing: 0.12em;
  position: relative;
  overflow: hidden;
  transition: color 0.3s var(--ease-out), transform 0.16s var(--ease-out);
}
.hero-cta::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--amber);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s var(--ease-out);
  z-index: -1;
}
.hero-cta:hover { color: var(--midnight); }
.hero-cta:hover::before { transform: scaleX(1); }
.hero-cta:active { transform: scale(0.97); }

.hero-scroll-hint {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  z-index: 2;
  opacity: 0.5;
}
.hero-scroll-hint span {
  font-family: 'Cormorant Garamond', serif;
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}
.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--lavender), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}
@keyframes scrollPulse {
  0%, 100% { opacity: 0.3; transform: scaleY(0.8); }
  50% { opacity: 1; transform: scaleY(1); }
}

/* ===== DIVIDER ===== */
.art-divider {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 1rem 0;
  overflow: hidden;
}
.art-divider img {
  width: min(600px, 80%);
  height: auto;
  opacity: 0.6;
  filter: drop-shadow(0 0 12px rgba(196,168,232,0.3));
}
.art-divider--flip img { transform: scaleX(-1); }

/* ===== SECTIONS ===== */
.section {
  position: relative;
  z-index: 2;
  padding: clamp(4rem, 10vw, 8rem) 0;
}

.section-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 clamp(1.5rem, 5vw, 4rem);
}
.section-inner--narrow { max-width: 780px; }

.section-label {
  font-family: 'Cormorant Garamond', serif;
  font-size: 0.75rem;
  letter-spacing: 0.3em;
  color: var(--violet-light);
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.section-title {
  font-family: 'Noto Serif JP', serif;
  font-size: clamp(1.6rem, 4vw, 2.6rem);
  font-weight: 400;
  line-height: 1.4;
  color: var(--fog);
  margin-bottom: 1.5rem;
}

/* ===== ABOUT ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 5rem);
  align-items: center;
}
@media (max-width: 720px) {
  .about-grid { grid-template-columns: 1fr; }
}

.about-video-wrap {
  position: relative;
  border-radius: 4px;
  overflow: hidden;
}
.about-video {
  width: 100%;
  display: block;
  border-radius: 4px;
}
.video-frame-deco {
  position: absolute;
  inset: 0;
  border: 1px solid var(--glass-border);
  border-radius: 4px;
  pointer-events: none;
  box-shadow: inset 0 0 40px rgba(107,79,160,0.15), 0 0 40px rgba(107,79,160,0.1);
}

.about-body {
  font-size: clamp(0.85rem, 1.8vw, 1rem);
  color: var(--fog-dim);
  line-height: 2.1;
  margin-bottom: 1.5rem;
}

.about-quote {
  font-family: 'Noto Serif JP', serif;
  font-size: clamp(0.9rem, 2vw, 1.1rem);
  color: var(--lavender);
  border-left: 2px solid var(--violet);
  padding-left: 1.2rem;
  margin-bottom: 2rem;
  font-style: italic;
  line-height: 1.8;
}

.about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.tag {
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  padding: 0.3em 0.9em;
  border: 1px solid var(--glass-border);
  color: var(--lavender-dim);
  border-radius: 2px;
  background: rgba(107,79,160,0.08);
}

/* ===== LINKS ===== */
.links-sub {
  font-family: 'Noto Serif JP', serif;
  font-size: 0.95rem;
  color: var(--lavender-dim);
  margin-bottom: 3rem;
  font-style: italic;
}

.links-grid {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.link-card {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  padding: 1.1rem 1.5rem;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: 4px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: background 0.3s var(--ease-out), border-color 0.3s var(--ease-out), transform 0.16s var(--ease-out);
  position: relative;
  overflow: hidden;
}
.link-card::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: var(--violet);
  transform: scaleY(0);
  transform-origin: bottom;
  transition: transform 0.3s var(--ease-out);
}
.link-card:hover {
  background: rgba(107,79,160,0.18);
  border-color: rgba(196,168,232,0.35);
}
.link-card:hover::before { transform: scaleY(1); }
.link-card:active { transform: scale(0.99); }

.link-card--primary[data-platform="youtube"]::before { background: #ff0000; }
.link-card--primary[data-platform="x"]::before { background: #e7e9ea; }
.link-card--primary[data-platform="instagram"]::before { background: #e1306c; }
.link-card--primary[data-platform="tiktok"]::before { background: #69c9d0; }
.link-card--music::before { background: var(--amber); }

.link-card-icon {
  width: 2.2rem;
  height: 2.2rem;
  flex-shrink: 0;
  color: var(--lavender-dim);
  transition: color 0.3s var(--ease-out);
}
.link-card-icon svg { width: 100%; height: 100%; }
.link-card:hover .link-card-icon { color: var(--lavender); }

.link-card-text {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}
.link-card-name {
  font-family: 'Noto Serif JP', serif;
  font-size: 1rem;
  font-weight: 400;
  color: var(--fog);
  letter-spacing: 0.04em;
}
.link-card-desc {
  font-size: 0.78rem;
  color: var(--lavender-dim);
  letter-spacing: 0.06em;
}

.link-card-arrow {
  font-family: 'Cormorant Garamond', serif;
  font-size: 1.2rem;
  color: var(--violet-light);
  opacity: 0;
  transform: translateX(-6px);
  transition: opacity 0.25s var(--ease-out), transform 0.25s var(--ease-out);
}
.link-card:hover .link-card-arrow {
  opacity: 1;
  transform: translateX(0);
}

/* ===== SCHEDULE ===== */
.schedule-sub {
  font-family: 'Noto Serif JP', serif;
  font-size: 0.95rem;
  color: var(--lavender-dim);
  margin-bottom: 2.5rem;
  font-style: italic;
}

.calendar-wrap {
  position: relative;
  border: 1px solid var(--glass-border);
  border-radius: 4px;
  overflow: hidden;
  background: var(--glass);
  backdrop-filter: blur(12px);
}

.calendar-iframe {
  display: block;
  width: 100%;
  min-height: 400px;
  filter: invert(1) hue-rotate(180deg) brightness(0.85);
  opacity: 0;
  transition: opacity 0.5s ease;
}
.calendar-iframe.loaded { opacity: 1; }

.calendar-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(13,8,32,0.6);
  transition: opacity 0.5s ease;
}
.calendar-placeholder.hidden { opacity: 0; pointer-events: none; }

.calendar-placeholder-inner {
  text-align: center;
  padding: 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}
.calendar-icon {
  width: 2.5rem;
  height: 2.5rem;
  color: var(--violet-light);
}
.calendar-placeholder-inner p {
  font-size: 0.9rem;
  color: var(--lavender-dim);
  line-height: 1.9;
}

/* ===== FOOTER ===== */
.footer {
  position: relative;
  z-index: 2;
  padding: 4rem 0 3rem;
  border-top: 1px solid var(--glass-border);
  background: linear-gradient(to bottom, transparent, rgba(13,8,32,0.9));
}

.footer-inner {
  max-width: 780px;
  margin: 0 auto;
  padding: 0 clamp(1.5rem, 5vw, 4rem);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.footer-name {
  font-family: 'Noto Serif JP', serif;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--fog);
  letter-spacing: 0.08em;
}

.footer-tagline {
  font-family: 'Noto Serif JP', serif;
  font-size: 0.85rem;
  color: var(--lavender-dim);
  font-style: italic;
  letter-spacing: 0.06em;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
  margin: 0.5rem 0;
}
.footer-links a {
  width: 1.4rem;
  height: 1.4rem;
  color: var(--lavender-dim);
  transition: color 0.25s var(--ease-out), transform 0.2s var(--ease-out);
}
.footer-links a:hover { color: var(--lavender); transform: translateY(-2px); }
.footer-links a svg { width: 100%; height: 100%; }

.footer-copy {
  font-size: 0.72rem;
  color: rgba(196,168,232,0.3);
  letter-spacing: 0.08em;
}

/* ===== SCROLL REVEAL ===== */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }

/* ===== RESPONSIVE ===== */
@media (max-width: 480px) {
  .hero-title { font-size: 2.8rem; }
  .link-card { padding: 0.9rem 1.1rem; }
  .art-divider img { width: 90%; }
}

/* ===== REDUCED MOTION ===== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  #rain-canvas { display: none; }
}