/* ===== 投資計算ラボ — 共有スタイル ===== */
:root {
  /* Colors */
  --primary: #2563EB;
  --primary-light: #3B82F6;
  --primary-50: #EFF4FF;
  --primary-100: #DBE6FE;
  --green: #22C55E;
  --green-dark: #16A34A;
  --green-light: #34D399;
  --green-50: #ECFDF3;
  --green-100: #D1FADF;
  --coral: #FF6B6B;
  --coral-50: #FFF1F1;
  --amber: #F59E0B;
  --amber-50: #FFFBEB;
  --purple: #8B5CF6;
  --purple-50: #F5F3FF;

  --ink-900: #0F172A;
  --ink-700: #334155;
  --ink-600: #475569;
  --ink-500: #64748B;
  --ink-400: #94A3B8;
  --line: #E2E8F0;
  --line-soft: #EEF2F6;
  --bg: #F5F7FA;
  --bg-soft: #F8FAFC;
  --white: #FFFFFF;

  /* Radii */
  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 16px;
  --r-xl: 20px;
  --r-pill: 999px;

  /* Shadow */
  --sh-sm: 0 1px 2px rgba(15,23,42,.06), 0 1px 3px rgba(15,23,42,.04);
  --sh-md: 0 2px 8px rgba(15,23,42,.06), 0 4px 16px rgba(15,23,42,.05);
  --sh-lg: 0 8px 28px rgba(15,23,42,.08), 0 2px 8px rgba(15,23,42,.04);
  --sh-blue: 0 8px 20px rgba(37,99,235,.24);

  --maxw: 1200px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: "Noto Sans JP", system-ui, sans-serif;
  color: var(--ink-900);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  line-height: 1.6;
  font-feature-settings: "palt" 1;
}
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input { font-family: inherit; }

/* ===== Layout ===== */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ===== Header ===== */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.88);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap {
  display: flex; align-items: center; gap: 28px;
  height: 72px;
}
.logo { display: flex; align-items: center; gap: 11px; flex-shrink: 0; }
.logo-mark {
  width: 38px; height: 38px; border-radius: 10px;
  background: linear-gradient(135deg, #EAF1FF, #DCE9FF);
  display: grid; place-items: center;
}
.logo-text { font-size: 23px; font-weight: 800; letter-spacing: .01em; }
.logo-text .lab { color: var(--green); }
.logo-text .main { color: var(--primary); }

.nav { display: flex; gap: 4px; margin-left: 8px; }
.nav a {
  padding: 8px 14px; border-radius: var(--r-sm);
  font-size: 15px; font-weight: 600; color: var(--ink-600);
  transition: .15s;
}
.nav a:hover { color: var(--primary); background: var(--primary-50); }
.nav a.active { color: var(--primary); }
.nav a.active::after {
  content: ""; display: block; height: 2px; border-radius: 2px;
  background: var(--primary); margin-top: 6px;
}
.header-tools { margin-left: auto; display: flex; align-items: center; gap: 18px; }
.header-link { display: flex; align-items: center; gap: 6px; font-size: 14px; font-weight: 600; color: var(--ink-600); }
.header-link:hover { color: var(--primary); }
.avatar {
  width: 38px; height: 38px; border-radius: 50%;
  background: var(--line); display: grid; place-items: center; color: var(--ink-400);
}
.menu-btn { display: none; }

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-weight: 700; font-size: 15px; border-radius: var(--r-md);
  padding: 13px 22px; transition: .16s; white-space: nowrap;
}
.btn-primary { background: var(--primary); color: #fff; box-shadow: var(--sh-blue); }
.btn-primary:hover { background: #1D4FD7; transform: translateY(-1px); }
.btn-secondary { background: #fff; color: var(--primary); border: 1.5px solid var(--primary-100); }
.btn-secondary:hover { background: var(--primary-50); border-color: var(--primary-light); }
.btn-success { background: var(--green); color: #fff; box-shadow: 0 8px 20px rgba(34,197,94,.24); }
.btn-success:hover { background: var(--green-dark); }
.btn-ghost { color: var(--ink-600); }
.btn-ghost:hover { color: var(--primary); }
.btn-block { width: 100%; }
.btn-lg { padding: 16px 28px; font-size: 16px; }

/* ===== Badges / tags ===== */
.tag {
  display: inline-flex; align-items: center; gap: 5px;
  font-size: 12.5px; font-weight: 700; padding: 4px 11px; border-radius: var(--r-pill);
}
.tag-hot { background: var(--coral-50); color: #E8475C; }
.tag-rec { background: var(--green-50); color: var(--green-dark); }
.tag-beginner { background: var(--primary-50); color: var(--primary); }
.tag-new { background: var(--amber-50); color: #B45309; }

/* ===== Card ===== */
.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--r-lg);
  box-shadow: var(--sh-sm);
}

/* search */
.search {
  display: flex; align-items: center; gap: 12px;
  background: #fff; border: 1.5px solid var(--line); border-radius: var(--r-md);
  padding: 0 16px; height: 56px; transition: .16s;
}
.search:focus-within { border-color: var(--primary-light); box-shadow: 0 0 0 4px var(--primary-50); }
.search input { flex: 1; border: none; outline: none; font-size: 16px; background: none; color: var(--ink-900); }
.search input::placeholder { color: var(--ink-400); }

/* chips */
.chips { display: flex; flex-wrap: wrap; gap: 9px; align-items: center; }
.chip {
  font-size: 13.5px; font-weight: 600; color: var(--ink-600);
  background: #fff; border: 1px solid var(--line); border-radius: var(--r-pill);
  padding: 7px 15px; transition: .14s;
}
.chip:hover { border-color: var(--primary-light); color: var(--primary); background: var(--primary-50); }

/* section heads */
.sec-title { font-size: 26px; font-weight: 800; letter-spacing: .01em; }
.sec-sub { color: var(--ink-500); font-size: 14.5px; }

/* icon element */
i[data-icon] { display: inline-flex; width: 1em; height: 1em; flex-shrink: 0; }
i[data-icon] svg { width: 100%; height: 100%; display: block; }

/* utility */
.muted { color: var(--ink-500); }
.num { font-variant-numeric: tabular-nums; font-feature-settings: "tnum" 1; }

@media (max-width: 860px) {
  .nav, .header-tools .header-link { display: none; }
  .site-header .wrap { height: 60px; gap: 12px; }
  .menu-btn { display: grid; place-items: center; margin-left: auto; width: 40px; height: 40px; color: var(--ink-700); }
  .wrap { padding: 0 16px; }
  .logo-text { font-size: 19px; }
  .logo-mark { width: 32px; height: 32px; }
}

/* ===== Footer（全ページ共通。tool ページは home.css/content.css を読まないため基本もここに置く） ===== */
.site-footer { background: var(--ink-900); color: #cbd5e1; padding: 40px 0; }
.foot-grid { display: flex; align-items: center; gap: 20px; flex-wrap: wrap; }
.foot-grid .logo-text { font-size: 19px; }
.foot-grid .logo-text .main { color: #93b4f8; }
.site-footer .foot-note { margin: 14px 0 0; font-size: 12.5px; color: #94a3b8; max-width: 60em; line-height: 1.6; }
.foot-links { display: flex; gap: 22px; flex-wrap: wrap; margin-left: auto; }
.foot-links a { font-size: 13px; font-weight: 600; color: #cbd5e1; transition: color .15s; }
.foot-links a:hover { color: #fff; }
.foot-copy { font-size: 12px; color: #7c8aa0; margin: 10px 0 0; }
/* tool ページはフッター上に余白を入れて本文と分離 */
.page + .site-footer, main.page ~ .site-footer { margin-top: 48px; }
@media (max-width: 860px) {
  .foot-links { margin-left: 0; gap: 16px 20px; }
}

/* ===== モバイルナビ（ハンバーガーで開くドロワー） ===== */
@media (max-width: 860px) {
  .site-header { position: relative; }
  .site-header.menu-open .nav {
    display: flex; flex-direction: column; align-items: stretch; margin: 0;
    position: absolute; top: 60px; left: 0; right: 0; z-index: 60;
    background: #fff; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
    box-shadow: var(--sh-md); padding: 4px 16px 8px; gap: 0;
  }
  .site-header.menu-open .nav a {
    padding: 13px 6px; font-size: 15px; font-weight: 700; color: var(--ink-700);
    border-bottom: 1px solid var(--line-soft);
  }
  .site-header.menu-open .nav a:last-child { border-bottom: none; }
  .site-header.menu-open .nav a.active { color: var(--primary); }
}