/**
 * site.css — 共通デザインシステム（LP準拠）
 * 全ページから読み込む: <link rel="stylesheet" href="/assets/css/site.css">
 */

:root {
  --pink: #FF6DB6;
  --pink-soft: #FF93C8;
  --pink-deep: #FF5AAA;
  --purple: #8B5CF6;
  --purple-soft: #A78BFA;
  --bg: #0D1117;
  --bg-2: #11161F;
  --surface: #1F2937;
  --surface-2: #2A3340;
  --line: rgba(255,255,255,0.08);
  --line-strong: rgba(255,255,255,0.14);
  --text: #F5F5F5;
  --text-dim: #B6BCC8;
  --text-mute: #8A93A3;
  --error-bg: rgba(255,109,182,0.08);
  --error-border: rgba(255,109,182,0.35);
  --error-text: #FFB3D6;
  --success-bg: rgba(139,92,246,0.10);
  --success-border: rgba(139,92,246,0.35);
  --success-text: #C4B5FD;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: 'Poppins', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  line-height: 1.5;
}
img { display: block; max-width: 100%; }
a { color: var(--pink); text-decoration: none; }
a:hover { color: var(--pink-soft); }

/* ========== Layout ========== */
.wrap { max-width: 1200px; margin: 0 auto; padding: 0 32px; }
.wrap-narrow { max-width: 720px; margin: 0 auto; padding: 0 24px; }
@media (max-width: 600px) {
  .wrap { padding: 0 20px; }
  .wrap-narrow { padding: 0 16px; }
}

/* ========== Top Nav (shared) ========== */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(13,17,23,0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.site-nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0;
  max-width: 1200px;
  margin: 0 auto;
  padding-left: 32px;
  padding-right: 32px;
}
.site-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: inherit;
}
.site-brand-mark {
  width: 24px; height: 24px;
  display: grid; place-items: center;
  color: var(--pink);
}
.site-brand-name {
  font-weight: 800;
  font-size: 15px;
  letter-spacing: 0.08em;
  color: var(--text);
}
.site-brand-tag {
  font-size: 10px;
  color: var(--text-mute);
  letter-spacing: 0.04em;
  margin-top: 1px;
}
.site-nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}
.site-nav-links a {
  color: var(--text-dim);
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-weight: 500;
}
.site-nav-links a:hover { color: var(--text); }
.site-nav-cta {
  background: linear-gradient(180deg, var(--pink) 0%, var(--pink-deep) 100%);
  color: white !important;
  padding: 9px 16px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  box-shadow: 0 4px 14px rgba(255,109,182,0.25);
}
.site-nav-cta:hover { color: white !important; filter: brightness(1.05); }
@media (max-width: 600px) {
  .site-nav-links a:not(.site-nav-cta) { display: none; }
  .site-nav-inner { padding-left: 20px; padding-right: 20px; }
}

/* ========== Buttons ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: inherit;
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border-radius: 8px;
  padding: 13px 26px;
  border: 0;
  cursor: pointer;
  text-decoration: none;
  color: white;
  transition: transform .15s ease, filter .15s ease;
  line-height: 1;
}
.btn-pink {
  background: linear-gradient(180deg, #FF7BBE 0%, var(--pink-deep) 100%);
  box-shadow: 0 6px 20px rgba(255,109,182,0.30), inset 0 1px 0 rgba(255,255,255,0.20);
  color: white;
}
.btn-pink:hover { transform: translateY(-1px); filter: brightness(1.05); color: white; }
.btn-purple {
  background: linear-gradient(180deg, var(--purple-soft) 0%, var(--purple) 100%);
  box-shadow: 0 6px 20px rgba(139,92,246,0.30), inset 0 1px 0 rgba(255,255,255,0.20);
  color: white;
}
.btn-purple:hover { transform: translateY(-1px); filter: brightness(1.05); color: white; }
.btn-ghost {
  background: transparent;
  border: 1px solid var(--line-strong);
  color: var(--text-dim);
}
.btn-ghost:hover { color: var(--text); border-color: var(--pink); }
.btn-block { width: 100%; }
.btn-lg { padding: 17px 34px; font-size: 15px; }
.btn-sm { padding: 9px 16px; font-size: 12px; }

/* ========== Cards ========== */
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 28px;
}
.card-hover { transition: transform .2s ease, border-color .2s ease; }
.card-hover:hover {
  transform: translateY(-3px);
  border-color: rgba(255,109,182,0.4);
}

/* ========== Form Inputs ========== */
.form-label {
  display: block;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-mute);
  letter-spacing: 0.10em;
  text-transform: uppercase;
  margin-bottom: 8px;
}
.form-input,
input[type="email"],
input[type="password"],
input[type="text"],
input[type="number"],
textarea,
select {
  width: 100%;
  padding: 13px 16px;
  background: var(--bg-2);
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  color: var(--text);
  font-family: inherit;
  font-size: 14px;
  outline: none;
  transition: border-color .15s ease, background .15s ease;
}
.form-input:focus,
input:focus, textarea:focus, select:focus {
  border-color: var(--pink);
  background: var(--bg);
}
.form-input::placeholder,
input::placeholder, textarea::placeholder { color: var(--text-mute); }
.form-help {
  font-size: 12px;
  color: var(--text-mute);
  margin-top: 6px;
  line-height: 1.5;
}
.form-row { margin-bottom: 18px; }

/* ========== Alerts ========== */
.alert {
  padding: 12px 16px;
  border-radius: 8px;
  font-size: 13px;
  line-height: 1.6;
  margin-bottom: 18px;
  border: 1px solid transparent;
}
.alert-error {
  background: var(--error-bg);
  border-color: var(--error-border);
  color: var(--error-text);
}
.alert-success {
  background: var(--success-bg);
  border-color: var(--success-border);
  color: var(--success-text);
}
.alert-info {
  background: rgba(139,92,246,0.06);
  border-color: rgba(139,92,246,0.20);
  color: var(--text-dim);
}

/* ========== Auth card layout ========== */
.auth-shell {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px 16px;
  background:
    radial-gradient(900px 500px at 75% 20%, rgba(139,92,246,0.18), transparent 60%),
    radial-gradient(700px 500px at 15% 80%, rgba(255,109,182,0.14), transparent 60%),
    var(--bg);
}
.auth-card {
  width: 100%;
  max-width: 440px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 40px 36px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.35);
  animation: fadeUp 0.45s ease both;
}
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}
.auth-brand {
  font-weight: 800;
  font-size: 14px;
  letter-spacing: 0.10em;
  color: var(--pink);
  margin-bottom: 28px;
  text-transform: uppercase;
}
.auth-title {
  font-size: 26px;
  font-weight: 700;
  margin: 0 0 8px;
  letter-spacing: -0.01em;
}
.auth-subtitle {
  font-size: 14px;
  color: var(--text-dim);
  margin: 0 0 28px;
  line-height: 1.6;
}
.auth-divider {
  height: 1px;
  background: var(--line);
  margin: 24px 0;
}
.auth-foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}
.auth-link-btn {
  background: none;
  border: none;
  color: var(--pink);
  font-family: inherit;
  font-size: 13px;
  cursor: pointer;
  padding: 0;
  text-decoration: underline;
  text-underline-offset: 3px;
}
.auth-link-btn:hover { color: var(--pink-soft); }
.auth-badge {
  display: inline-block;
  background: rgba(139,92,246,0.10);
  border: 1px solid rgba(139,92,246,0.25);
  border-radius: 6px;
  padding: 5px 10px;
  font-size: 12px;
  color: var(--purple-soft);
  margin-bottom: 24px;
  word-break: break-all;
}

/* ========== Page Heading ========== */
.page-head {
  text-align: center;
  padding: 60px 0 36px;
}
.page-head h1 {
  font-size: clamp(28px, 3.4vw, 38px);
  font-weight: 700;
  margin: 0 0 10px;
  letter-spacing: -0.01em;
}
.page-head p {
  color: var(--text-dim);
  font-size: 14px;
  margin: 0;
}
.page-head .pink { color: var(--pink); }
.page-head .purple { color: var(--purple); }

/* ========== Section ========== */
section.std { padding: 60px 0; }

/* ========== Footer ========== */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 28px 0;
  text-align: center;
  color: var(--text-mute);
  font-size: 12px;
}
.site-footer a { color: inherit; text-decoration: underline; text-underline-offset: 3px; }
.site-footer a:hover { color: var(--text-dim); }

/* ========== Utilities ========== */
.pink { color: var(--pink); }
.purple { color: var(--purple); }
.text-dim { color: var(--text-dim); }
.text-mute { color: var(--text-mute); }
.text-center { text-align: center; }
.mb-0 { margin-bottom: 0; }
.mb-2 { margin-bottom: 8px; }
.mb-4 { margin-bottom: 16px; }
.mt-4 { margin-top: 16px; }