@font-face {
  font-family: 'Syne';
  src: url('/assets/syne.woff2') format('woff2');
  font-weight: 700 800;
  font-display: swap;
}
:root {
  --display: 'Syne', 'Hiragino Sans', 'Noto Sans JP', sans-serif;
  --bg: #0A0E17;
  --bg-glow-1: rgba(91, 140, 255, 0.16);
  --bg-glow-2: rgba(255, 122, 89, 0.11);
  --bg-glow-3: rgba(45, 212, 191, 0.08);
  --glass: rgba(255, 255, 255, 0.045);
  --glass-strong: rgba(255, 255, 255, 0.07);
  --line: rgba(255, 255, 255, 0.10);
  --line-strong: rgba(255, 255, 255, 0.18);
  --ink: #EAF0FA;
  --ink-soft: #94A2B8;
  --electric: #5B8CFF;
  --coral: #FF7A59;
  --link: #8FB0FF;
  --btn-grad: linear-gradient(135deg, #5B8CFF, #3E63E0);
  --btn-glow: 0 10px 34px rgba(91, 140, 255, 0.35);
  --hero-grad: linear-gradient(92deg, #8FB0FF, #FF9C7E);
  --success-container: rgba(52, 211, 153, 0.15);
  --on-success-container: #7BE3AC;
  --warning-container: rgba(251, 191, 36, 0.15);
  --on-warning-container: #FCD34D;
  --info-container: rgba(45, 212, 191, 0.15);
  --on-info-container: #6EE0D2;
  --accent-container: rgba(255, 122, 89, 0.16);
  --on-accent-container: #FFA98F;
  --neutral-container: rgba(255, 255, 255, 0.07);
  --on-neutral-container: #AAB6C8;
  --radius: 20px;
  --header-bg: rgba(10, 14, 23, 0.7);
  --shadow-card: 0 20px 60px rgba(0, 0, 0, 0.35);
}
@media (prefers-color-scheme: light) {
  :root {
    --bg: #F3F5FB;
    --bg-glow-1: rgba(91, 140, 255, 0.16);
    --bg-glow-2: rgba(255, 122, 89, 0.12);
    --bg-glow-3: rgba(45, 212, 191, 0.10);
    --glass: rgba(255, 255, 255, 0.62);
    --glass-strong: rgba(255, 255, 255, 0.85);
    --line: rgba(16, 24, 46, 0.10);
    --line-strong: rgba(16, 24, 46, 0.2);
    --ink: #10182E;
    --ink-soft: #4E5A72;
    --link: #2E5EDB;
    --hero-grad: linear-gradient(92deg, #2E5EDB, #E2694F);
    --success-container: #D4F3DF;
    --on-success-container: #135C33;
    --warning-container: #FDEEC8;
    --on-warning-container: #6B4A00;
    --info-container: #CFF0EC;
    --on-info-container: #0B4F49;
    --accent-container: #FFE0D4;
    --on-accent-container: #8A3418;
    --neutral-container: rgba(16, 24, 46, 0.06);
    --on-neutral-container: #4E5A72;
    --header-bg: rgba(243, 245, 251, 0.72);
    --shadow-card: 0 16px 44px rgba(30, 58, 102, 0.10);
  }
}

* { box-sizing: border-box; }
button, input, select, textarea { font: inherit; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Hiragino Sans", "Noto Sans JP", "Yu Gothic UI", sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.85;
  letter-spacing: 0;
  overflow-x: hidden;
}
/* オーロラ背景(固定・ゆっくり漂う) */
body::before {
  content: ""; position: fixed; inset: -20% -10%; z-index: -2;
  background:
    radial-gradient(46rem 30rem at 12% 8%, var(--bg-glow-1), transparent 62%),
    radial-gradient(38rem 26rem at 88% 14%, var(--bg-glow-2), transparent 60%),
    radial-gradient(44rem 32rem at 55% 96%, var(--bg-glow-3), transparent 60%);
  animation: aurora 26s ease-in-out infinite alternate;
}
/* 微細ノイズで質感を出す */
body::after {
  content: ""; position: fixed; inset: 0; z-index: -1; pointer-events: none;
  opacity: 0.05;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)'/%3E%3C/svg%3E");
}
@keyframes aurora {
  from { transform: translate3d(0, 0, 0) scale(1); }
  to { transform: translate3d(2%, 3%, 0) scale(1.06); }
}
@media (prefers-reduced-motion: reduce) {
  body::before { animation: none; }
  html { scroll-behavior: auto; }
}

main { max-width: 760px; margin: 0 auto; padding: 20px 20px 64px; }
h1 {
  font-family: var(--display);
  font-size: clamp(1.9rem, 5.4vw, 3rem);
  line-height: 1.22; letter-spacing: 0.005em;
  font-weight: 800; margin: 0.5em 0 0.4em;
}
h2 { font-size: 1.22rem; line-height: 1.4; margin: 0 0 0.6em; font-weight: 700; }
h3 { font-size: 1.05rem; margin: 1em 0 0.4em; }
a { color: var(--link); }
.grad {
  background: var(--hero-grad);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-sub { display: block; font-size: 1rem; font-weight: 600; color: var(--ink-soft); margin-top: 10px; font-family: "Hiragino Sans", "Noto Sans JP", sans-serif; letter-spacing: 0; }
.overline {
  font-family: var(--display); font-weight: 700; font-size: 0.74rem;
  letter-spacing: 0.22em; text-transform: uppercase;
  color: var(--coral); margin: 0 0 6px;
}

.site-header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 13px 22px; position: sticky; top: 0; z-index: 10;
  background: var(--header-bg);
  -webkit-backdrop-filter: blur(18px) saturate(1.4);
  backdrop-filter: blur(18px) saturate(1.4);
}
.site-header::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--line-strong), transparent);
}
.brand { display: flex; align-items: center; gap: 9px; text-decoration: none; color: var(--ink); font-weight: 800; font-family: var(--display); letter-spacing: 0.02em; }
.brand img { border-radius: 7px; }
.site-header nav { display: flex; gap: 16px; }
.site-header nav a { text-decoration: none; font-weight: 600; font-size: 0.9rem; color: var(--ink-soft); transition: color 0.2s; }
.site-header nav a:hover { color: var(--ink); }

.card {
  background: var(--glass);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border: 1px solid var(--line);
  border-radius: var(--radius); padding: 22px; margin: 18px 0;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

/* リビール */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1), transform 0.7s cubic-bezier(0.16, 1, 0.3, 1); }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; transition: none; } }

/* ヒーロー */
.hero { padding-top: 26px; }
.hero p { color: var(--ink-soft); font-size: 1.02rem; }
.hero-flex { display: flex; gap: 28px; align-items: center; }
.hero-copy { flex: 1; min-width: 0; }
.hero-shot {
  width: 190px; height: auto; flex-shrink: 0; border-radius: 22px;
  border: 1px solid var(--line-strong);
  box-shadow: 0 34px 90px rgba(91, 140, 255, 0.28), 0 8px 30px rgba(0, 0, 0, 0.4);
  transform: rotate(4deg);
  animation: float 7s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: rotate(4deg) translateY(0); }
  50% { transform: rotate(4deg) translateY(-10px); }
}
@media (prefers-reduced-motion: reduce) { .hero-shot { animation: none; } }
.hero-actions { display: flex; gap: 10px; flex-wrap: wrap; margin: 18px 0 8px; }

/* 数字タイル */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin: 26px 0 6px; }
.stat {
  background: var(--glass); border: 1px solid var(--line); border-radius: 16px;
  padding: 14px 8px 10px; text-align: center;
  -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px);
}
.stat-num {
  /* 数字はSyneだと横に間延びするため、引き締まったシステム太字を使う */
  font-family: "Hiragino Sans", "Noto Sans JP", -apple-system, sans-serif;
  font-weight: 800; letter-spacing: -0.02em;
  font-size: clamp(1.5rem, 4.6vw, 2.1rem); line-height: 1.1;
  background: var(--hero-grad);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.stat-label { font-size: 0.76rem; color: var(--ink-soft); font-weight: 600; }

.btn {
  display: inline-block; padding: 13px 22px; border-radius: 14px;
  font-weight: 700; text-decoration: none; border: none; cursor: pointer; font-size: 1rem;
  min-height: 48px; transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.2s;
}
.btn-primary { background: var(--btn-grad); color: #fff; box-shadow: var(--btn-glow); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 16px 44px rgba(91, 140, 255, 0.45); }
.btn-hero {
  background: linear-gradient(135deg, #5B8CFF 10%, #FF7A59 130%);
  color: #fff; box-shadow: 0 12px 40px rgba(255, 122, 89, 0.28), var(--btn-glow);
}
.btn-hero:hover { transform: translateY(-2px) scale(1.02); }
.btn-ghost { background: var(--glass-strong); color: var(--ink); border: 1px solid var(--line-strong); }
.btn-ghost:hover { border-color: var(--link); color: var(--link); }

.badge {
  display: inline-block; padding: 4px 11px; border-radius: 999px;
  font-size: 0.82rem; font-weight: 700;
}
.tone-success { background: var(--success-container); color: var(--on-success-container); }
.tone-warning { background: var(--warning-container); color: var(--on-warning-container); }
.tone-info { background: var(--info-container); color: var(--on-info-container); }
.tone-accent { background: var(--accent-container); color: var(--on-accent-container); }
.tone-neutral { background: var(--neutral-container); color: var(--on-neutral-container); }
.badge-soon { color: var(--ink-soft); font-weight: 600; }

/* チェッカー(主役カード: グラデーション枠) */
.checker {
  border: 1px solid transparent;
  background:
    linear-gradient(var(--bg), var(--bg)) padding-box,
    linear-gradient(130deg, rgba(91, 140, 255, 0.65), rgba(255, 122, 89, 0.45), rgba(45, 212, 191, 0.4)) border-box;
  box-shadow: var(--shadow-card);
}
@media (prefers-color-scheme: light) {
  .checker { background:
    linear-gradient(#FDFDFF, #FDFDFF) padding-box,
    linear-gradient(130deg, rgba(46, 94, 219, 0.5), rgba(226, 105, 79, 0.4)) border-box; }
}
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }
.chip {
  border: 1px solid var(--line-strong); background: var(--glass); border-radius: 999px;
  padding: 8px 14px; cursor: pointer; font-size: 0.9rem; color: var(--ink);
  transition: border-color 0.2s, color 0.2s, transform 0.2s;
}
.chip:hover { border-color: var(--coral); color: var(--coral); transform: translateY(-1px); }
.quick-label { margin: 0 0 6px; font-size: 0.9rem; color: var(--ink-soft); }

.row { display: flex; gap: 8px; margin-bottom: 8px; }
.row input, .tool-form input, .tool-form select {
  border: 1px solid var(--line-strong); border-radius: 13px; padding: 12px 14px;
  font-size: 16px; min-width: 0; background: var(--glass-strong); color: var(--ink);
}
.row input:focus, .tool-form input:focus, .tool-form select:focus {
  outline: 2px solid var(--electric); outline-offset: 1px; border-color: transparent;
}
.row .name { flex: 2; }
.row .amount { flex: 1; }
.row .remove { background: none; border: none; color: var(--ink-soft); font-size: 1.2rem; cursor: pointer; padding: 0 4px; }
.checker-actions { display: flex; gap: 8px; margin-top: 12px; flex-wrap: wrap; }

.result-card { border: 1px solid var(--line); border-radius: 16px; padding: 15px 17px; margin: 10px 0; background: var(--glass); }
.result-card h3 { margin: 0 0 6px; font-size: 1rem; }
.result-card p { margin: 6px 0; font-size: 0.92rem; color: var(--ink-soft); }
.result-card .badges { margin: 4px 0; }
.result-summary { padding: 14px 16px; border-radius: 14px; background: var(--accent-container); color: var(--on-accent-container); font-weight: 600; margin-top: 14px; }
.result-note { font-size: 0.85rem; color: var(--ink-soft); margin-top: 12px; }

.amount-bar { display: flex; height: 24px; border-radius: 12px; overflow: hidden; margin: 12px 0 6px; border: 1px solid var(--line-strong); }
.amount-bar > div { min-width: 2px; }
.amount-bar .tone-success { background: #34D399; }
.amount-bar .tone-warning { background: #FBBF24; }
.amount-bar .tone-info { background: #2DD4BF; }
.bar-legend { display: flex; flex-wrap: wrap; gap: 8px; font-size: 0.8rem; color: var(--ink-soft); }
.bar-legend .badge { font-size: 0.75rem; }

.app-cta { margin: 26px 0; }
.app-cta-inner {
  display: flex; gap: 18px; align-items: flex-start;
  background:
    linear-gradient(var(--glass), var(--glass)) padding-box,
    linear-gradient(120deg, rgba(91, 140, 255, 0.4), rgba(255, 122, 89, 0.3)) border-box;
  border: 1px solid transparent;
  -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px);
  border-radius: var(--radius); padding: 22px;
}
.app-cta img { border-radius: 13px; flex-shrink: 0; box-shadow: 0 10px 30px rgba(91, 140, 255, 0.3); }
.app-cta h2 { margin-top: 0; }
.app-cta p { color: var(--ink-soft); margin: 8px 0; }
.cta-buttons { display: flex; gap: 8px; flex-wrap: wrap; }

/* ベントーグリッド */
.item-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.item-link {
  position: relative;
  display: flex; flex-direction: column; gap: 7px; padding: 17px 18px;
  background: var(--glass); border: 1px solid var(--line); border-radius: 18px;
  text-decoration: none; color: var(--ink);
  -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px);
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.25s, box-shadow 0.25s;
}
.item-link::after {
  content: "→"; position: absolute; right: 15px; top: 13px;
  font-family: var(--display); font-weight: 700; color: var(--ink-soft);
  transition: transform 0.25s, color 0.25s;
}
.item-link:hover {
  transform: translateY(-3px); border-color: var(--line-strong);
  box-shadow: 0 14px 40px rgba(91, 140, 255, 0.15);
}
.item-link:hover::after { transform: translateX(4px); color: var(--coral); }
.item-name { font-weight: 700; font-size: 0.96rem; padding-right: 20px; }
.item-link .badge { align-self: flex-start; font-size: 0.74rem; }
.item-link .item-desc { font-size: 0.8rem; color: var(--ink-soft); }

.breadcrumb { font-size: 0.85rem; color: var(--ink-soft); margin-top: 14px; }
.breadcrumb a { color: var(--ink-soft); }
.badges { display: flex; gap: 8px; flex-wrap: wrap; }
.related ul { margin: 0; padding-left: 1.2em; }

.faq details {
  border: 1px solid var(--line); border-radius: 14px; margin: 8px 0;
  background: var(--glass);
}
.faq summary { padding: 13px 17px; font-weight: 700; cursor: pointer; }
.faq summary:hover { color: var(--link); }
.faq details > p { padding: 0 17px 13px; margin: 0; color: var(--ink-soft); }

.step { display: flex; gap: 15px; margin: 16px 0; }
.step-num {
  flex-shrink: 0; width: 38px; height: 38px; border-radius: 12px;
  background: var(--btn-grad); color: #fff; font-weight: 800;
  font-family: var(--display); font-size: 1.05rem;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 6px 18px rgba(91, 140, 255, 0.3);
}
.step-body h3 { margin: 6px 0 4px; }
.step-body p { margin: 0; color: var(--ink-soft); font-size: 0.95rem; }

.task { border: 1px solid var(--line); border-radius: 16px; padding: 15px 17px; margin: 10px 0; background: var(--glass); }
.task h3 { margin: 0 0 4px; font-size: 1rem; }
.task p { margin: 4px 0; font-size: 0.92rem; color: var(--ink-soft); }
.task ul { margin: 6px 0; padding-left: 1.3em; font-size: 0.9rem; color: var(--ink-soft); }
.deadline-label {
  font-family: var(--display); font-size: 1.02rem; font-weight: 800;
  margin: 26px 0 4px; letter-spacing: 0.04em;
  background: var(--hero-grad);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}

.tool-form { display: flex; flex-direction: column; gap: 12px; max-width: 440px; }
.tool-form label { font-weight: 700; font-size: 0.95rem; }
.tool-result { margin-top: 16px; }
.big-number {
  font-family: "Hiragino Sans", "Noto Sans JP", -apple-system, sans-serif;
  font-size: 3rem; font-weight: 800; line-height: 1.1; letter-spacing: -0.02em;
  background: var(--hero-grad);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  margin: 8px 0;
}

.disclaimer { font-size: 0.8rem; color: var(--ink-soft); border-top: 1px solid var(--line); padding: 18px 0 0; }
.site-footer { max-width: 760px; margin: 0 auto; padding: 0 20px 40px; }
.footer-links { font-size: 0.85rem; }
.footer-links a { color: var(--ink-soft); }
.footer-links a:hover { color: var(--link); }
.copyright { font-size: 0.8rem; color: var(--ink-soft); }

@media (max-width: 600px) {
  .item-grid { grid-template-columns: 1fr; }
  .app-cta-inner { flex-direction: column; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .hero-flex { flex-direction: column-reverse; }
  .hero-shot { width: 168px; align-self: center; }
  .site-header nav { gap: 11px; }
  .site-header nav a { font-size: 0.85rem; }
}