/* ONE SONG contact page */
/* ── CSS Variables ── */
:root {
  --os-pink-mid: #d4728f;
  --os-rose: #8e4360;
  --os-charcoal: #1e1e1e;
  --os-text-light: #4f4f4f;
  --os-pink-pale: #fef0f0;
  --os-cream: #fdf8f5;
  --os-font-display: 'Cormorant Garamond', 'Noto Serif JP', serif;
}

.osc-group[hidden] { display: none; }

/* ── Header ── */
.os-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(255,255,255,0.92); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0,0,0,0.04);
  transition: box-shadow 0.3s, background 0.3s;
}
.os-header.scrolled { box-shadow: 0 4px 30px rgba(0,0,0,0.05); }
.os-header__inner { max-width: 1200px; margin: 0 auto; padding: 12px 20px; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.os-logo { display: flex; align-items: center; gap: 10px; text-decoration: none; color: inherit; }
.os-logo__mark { width: 36px; height: 36px; display: grid; place-items: center; border-radius: 10px; background: linear-gradient(135deg, #d4728f, #8e4360); color: #fff; font-size: 16px; font-weight: 700; box-shadow: 0 4px 12px rgba(142,67,96,0.25); }
.os-logo__name { display: block; font-family: var(--os-font-display); font-weight: 600; font-size: 18px; letter-spacing: 0.1em; }
.os-logo__sub { display: block; font-size: 12px; color: #4f4f4f; margin-top: 1px; }
.os-nav { display: flex; gap: 6px; align-items: center; }
.os-nav__link { text-decoration: none; font-size: 14px; font-weight: 500; opacity: 0.8; padding: 8px 12px; min-height: 44px; border-radius: 999px; color: inherit; transition: all 0.25s; display: inline-flex; align-items: center; }
.os-nav__link:hover, .os-nav__link.is-active { background: rgba(232,164,184,0.12); opacity: 1; color: #8e4360; }
.os-header__cta { display: flex; gap: 10px; align-items: center; }
.os-hbtn { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 0 16px; border-radius: 999px; text-decoration: none; font-weight: 700; font-size: 14px; color: inherit; transition: all 0.3s; }
.os-hbtn--primary { background: #1e1e1e; color: #fff; border: none; box-shadow: 0 4px 14px rgba(0,0,0,0.15); }
.os-hbtn--primary:hover { background: #8e4360; box-shadow: 0 6px 20px rgba(142,67,96,0.3); }
.os-hbtn--ghost { background: transparent; border: 1px solid rgba(0,0,0,0.12); }
.os-burger { width: 44px; height: 44px; border-radius: 12px; border: 1px solid rgba(0,0,0,0.08); background: rgba(255,255,255,0.7); display: none; position: relative; cursor: pointer; }
.os-burger span { position: absolute; left: 10px; right: 10px; height: 2px; background: #1e1e1e; border-radius: 2px; }
.os-burger span:nth-child(1) { top: 15px; }
.os-burger span:nth-child(2) { top: 21px; opacity: 0.7; }
.os-burger span:nth-child(3) { top: 27px; opacity: 0.5; }
.os-drawer { border-top: 1px solid rgba(0,0,0,0.04); background: rgba(253,248,245,0.97); backdrop-filter: blur(12px); }
.os-drawer__inner { max-width: 1100px; margin: 0 auto; padding: 14px 20px 20px; display: grid; gap: 8px; }
.os-drawer__link { display: flex; align-items: center; min-height: 44px; padding: 12px 14px; border-radius: 14px; text-decoration: none; background: rgba(0,0,0,0.02); color: inherit; font-size: 15px; transition: background 0.2s; }
.os-drawer__link:hover, .os-drawer__link.is-active { background: rgba(232,164,184,0.1); }

/* ── Footer ── */
.os-footer {
  background: #1e1e1e; color: rgba(255,255,255,0.85);
  padding: 56px 24px 36px; font-size: 14px;
}
.os-footer__inner { max-width: 1100px; margin: 0 auto; padding: 0 24px; }
.os-footer__top { display: flex; align-items: flex-start; justify-content: space-between; gap: 30px; flex-wrap: wrap; padding-bottom: 32px; border-bottom: 1px solid rgba(255,255,255,0.12); }
.os-footer__name { font-family: var(--os-font-display); font-weight: 600; font-size: 20px; letter-spacing: 0.1em; color: #fff; }
.os-footer__tag { font-size: 13px; opacity: 0.6; margin-top: 4px; color: rgba(255,255,255,0.7); }
.os-footer__desc { font-size: 13px; opacity: 0.85; margin-top: 2px; }
.os-footer__cta { display: flex; gap: 10px; flex-wrap: wrap; }
.os-footer__cta-btn { display: inline-flex; align-items: center; gap: 6px; min-height: 44px; padding: 10px 18px; border-radius: 10px; font-size: 13px; font-weight: 700; text-decoration: none; transition: all 0.25s; }
.os-footer__cta-btn--primary { background: #fff; color: #1e1e1e; }
.os-footer__cta-btn--primary:hover { background: #d4728f; color: #fff; }
.os-footer__cta-btn--ghost { border: 1px solid rgba(255,255,255,0.2); color: rgba(255,255,255,0.8); background: transparent; }
.os-footer__cta-btn--ghost:hover { border-color: rgba(255,255,255,0.5); color: #fff; }
.os-footer__nav { margin-top: 24px; display: flex; gap: 18px; flex-wrap: wrap; }
.os-footer__nav a { text-decoration: none; color: rgba(255,255,255,0.7); font-size: 14px; transition: color 0.2s; min-height: 44px; display: inline-flex; align-items: center; }
.os-footer__nav a:hover { color: #fff; }
.os-footer__meta { margin-top: 24px; font-size: 12px; opacity: 0.5; }

/* ── Header/Footer responsive ── */
@media (max-width: 860px) {
  .os-nav { display: none; }
  .os-hbtn--ghost { display: none; }
  .os-burger { display: inline-block; }
  .os-footer__top { flex-direction: column; }
}

/* ── Contact Page ── */
.osc-page {
  font-family: 'Noto Sans JP', 'Meiryo', system-ui, sans-serif;
  color: #2a2a2a; line-height: 1.8;
  background: #fdf8f5;
  -webkit-font-smoothing: antialiased;
}
.osc-page *, .osc-page *::before, .osc-page *::after { box-sizing: border-box; }

/* Hero — quiet, spacious */
.osc-hero {
  padding: 130px 24px 72px;
  text-align: center;
  position: relative; overflow: hidden;
  background: #fdf8f5;
}
.osc-hero::before {
  content: ''; position: absolute;
  width: 500px; height: 500px; border-radius: 50%;
  background: radial-gradient(circle, rgba(232,164,184,0.06) 0%, transparent 70%);
  top: -100px; right: -160px; pointer-events: none;
}
.osc-kicker {
  font-family: 'Cormorant Garamond', serif;
  font-size: 13px; font-weight: 400; letter-spacing: 0.25em;
  color: #b3a09a; margin: 0 0 28px;
}
.osc-title {
  font-family: 'Cormorant Garamond', 'Noto Serif JP', serif;
  font-size: clamp(28px, 4vw, 46px); font-weight: 400;
  letter-spacing: 0.06em; color: #1e1e1e; margin: 0 0 28px;
  line-height: 1.3;
}
.osc-lead {
  font-size: 14px; color: #7a7a7a; margin: 0 auto;
  max-width: 400px; line-height: 2;
  letter-spacing: 0.03em;
}
.osc-divider-line {
  width: 40px; height: 1px; background: #d4728f;
  margin: 28px auto 0; opacity: 0.4;
}

/* Container */
.osc-wrap {
  max-width: 600px; margin: 0 auto;
  padding: 0 24px 100px;
}

/* Form card — minimal, breathing */
.osc-card {
  background: #fff;
  border-radius: 20px;
  padding: 48px 44px;
  box-shadow: 0 2px 40px rgba(0,0,0,0.03);
  border: 1px solid rgba(0,0,0,0.03);
}

/* Section heading */
.osc-section-label {
  font-family: 'Cormorant Garamond', serif;
  font-size: 11px; font-weight: 400;
  letter-spacing: 0.2em; color: #b3a09a;
  text-transform: uppercase;
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(0,0,0,0.04);
}

/* Divider */
.osc-hr {
  border: none; border-top: 1px solid rgba(0,0,0,0.04);
  margin: 36px 0;
}

/* Form group */
.osc-group { margin-bottom: 24px; }
.osc-label {
  display: block; font-size: 12px; font-weight: 600;
  margin-bottom: 8px; color: #4f4f4f; letter-spacing: 0.04em;
}
.osc-req {
  display: inline-block; font-size: 9px; font-weight: 700;
  color: #d4728f;
  margin-left: 4px; vertical-align: middle;
  letter-spacing: 0.06em;
}

/* Inputs — soft, warm */
.osc-input, .osc-select, .osc-textarea {
  display: block; width: 100%;
  padding: 13px 16px;
  border: 1px solid rgba(0,0,0,0.07);
  border-radius: 10px;
  font-size: 14px; font-family: inherit;
  background: #fdf8f5; color: #2a2a2a;
  transition: border-color 0.3s, box-shadow 0.3s, background 0.3s;
  -webkit-appearance: none; appearance: none;
}
.osc-input::placeholder, .osc-textarea::placeholder { color: rgba(0,0,0,0.18); font-size: 13px; }
.osc-input:focus:not(:focus-visible), .osc-select:focus:not(:focus-visible), .osc-textarea:focus:not(:focus-visible) {
  outline: none; border-color: rgba(212,114,143,0.4);
  box-shadow: 0 0 0 3px rgba(212,114,143,0.06);
  background: #fff;
}
.osc-textarea { resize: vertical; min-height: 140px; line-height: 1.9; }
.osc-select {
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%23999' stroke-width='1.2' fill='none'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  padding-right: 40px;
}

/* Row (2-col) */
.osc-row { display: flex; gap: 16px; }
.osc-half { flex: 1; min-width: 0; }

/* Radio — card-style, minimal */
.osc-radios { display: flex; gap: 12px; flex-wrap: wrap; }
.osc-radio {
  display: flex; align-items: center; gap: 12px;
  cursor: pointer; padding: 15px 20px;
  border: 1px solid rgba(0,0,0,0.06); border-radius: 12px;
  flex: 1; min-width: 160px;
  transition: all 0.3s; font-size: 13px; font-weight: 500;
  background: #fdf8f5;
}
.osc-radio:hover { border-color: rgba(212,114,143,0.3); }
.osc-radio input[type="radio"] { display: none; }
.osc-radio-dot {
  width: 18px; height: 18px; border-radius: 50%;
  border: 1.5px solid rgba(0,0,0,0.1);
  position: relative; flex-shrink: 0; transition: all 0.3s;
}
.osc-radio-dot::after {
  content: ''; position: absolute;
  top: 3px; left: 3px; right: 3px; bottom: 3px;
  border-radius: 50%; background: #d4728f;
  transform: scale(0); transition: transform 0.3s cubic-bezier(0.34,1.56,0.64,1);
}
.osc-radio input:checked ~ .osc-radio-dot { border-color: #d4728f; }
.osc-radio input:checked ~ .osc-radio-dot::after { transform: scale(1); }
.osc-radio input:checked ~ .osc-radio-text { color: #8e4360; font-weight: 600; }

/* Submit — quiet confidence */
.osc-submit {
  display: block; width: 100%; max-width: 280px;
  margin: 40px auto 0; padding: 16px 24px;
  background: #1e1e1e; color: #fff; border: none;
  border-radius: 14px; font-size: 14px; font-weight: 600;
  cursor: pointer; transition: all 0.4s;
  letter-spacing: 0.06em; font-family: inherit;
}
.osc-submit:hover {
  background: #8e4360; transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(142,67,96,0.15);
}

/* Note */
.osc-note {
  text-align: center; margin-top: 28px;
  font-size: 11px; color: #aaa; line-height: 1.9;
  letter-spacing: 0.02em;
}

/* Error */
.osc-error {
  background: #fff; border-left: 3px solid #d4728f;
  border-radius: 10px; padding: 16px 20px; margin-bottom: 24px;
}
.osc-error p { margin: 0; font-size: 13px; color: #8e4360; }

/* Done */
.osc-done { text-align: center; padding: 64px 32px; }
.osc-done-mark {
  font-family: 'Cormorant Garamond', serif;
  font-size: 14px; letter-spacing: 0.2em; color: #d4728f;
  margin-bottom: 24px;
}
.osc-done-title {
  font-family: 'Cormorant Garamond', 'Noto Serif JP', serif;
  font-size: 22px; font-weight: 400; margin: 0 0 16px;
  letter-spacing: 0.04em; color: #1e1e1e;
}
.osc-done-text { font-size: 13px; color: #7a7a7a; margin: 0 0 32px; line-height: 2; }
.osc-done-btn {
  display: inline-block; padding: 11px 28px;
  border: 1px solid rgba(0,0,0,0.12);
  border-radius: 10px; color: #2a2a2a; text-decoration: none;
  font-size: 13px; font-weight: 600; transition: all 0.3s;
  letter-spacing: 0.03em;
}
.osc-done-btn:hover { background: #1e1e1e; color: #fff; border-color: #1e1e1e; }

/* Accessibility: stable touch targets and keyboard focus */
.os-nav__link,
.os-hbtn,
.os-burger,
.os-drawer__link,
.os-footer__cta-btn,
.osc-submit,
.osc-done-btn {
  min-height: 44px;
}

.os-burger {
  min-width: 44px;
}

.os-nav__link:focus-visible,
.os-hbtn:focus-visible,
.os-burger:focus-visible,
.os-drawer__link:focus-visible,
.os-footer__cta-btn:focus-visible,
.osc-submit:focus-visible,
.osc-done-btn:focus-visible {
  outline: 3px solid rgba(212, 114, 143, .85);
  outline-offset: 3px;
}

/* Responsive */
@media (max-width: 640px) {
  .osc-hero { padding: 110px 20px 56px; }
  .osc-title { font-size: 26px; }
  .osc-lead br { display: none; }
  .osc-card { padding: 32px 22px; border-radius: 16px; }
  .osc-row { flex-direction: column; gap: 0; }
  .osc-radios { flex-direction: column; gap: 10px; }
  .osc-radio { min-width: 0; }
  .osc-submit { max-width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  .osc-page *,
  .osc-page *::before,
  .osc-page *::after,
  .os-header,
  .os-header * {
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    scroll-behavior:auto !important;
    transition-duration:.001ms !important;
  }
}