/* =========================================================
   3分知見メディア — Design System
   "The Economist" inspired: Navy, Serif headings, Generous whitespace
   ========================================================= */

:root {
  /* Brand palette */
  --navy-900: #0a1f3d;
  --navy-800: #122a4f;
  --navy-700: #1c3a66;
  --navy-600: #2c4f80;
  --navy-500: #4a6fa0;

  --ink-900: #14181f;
  --ink-700: #2d3748;
  --ink-600: #4a5568;
  --ink-500: #718096;
  --ink-400: #a0aec0;
  --ink-300: #cbd5e0;
  --ink-200: #e2e8f0;
  --ink-100: #f1f4f8;
  --ink-50:  #f8fafc;

  --paper:   #fbfaf7;       /* off-white, paper-like */
  --paper-2: #f5f2ec;
  --white:   #ffffff;

  --accent-green: #5a8a6e;  /* sage */
  --accent-blue:  #2563a8;
  --accent-gold:  #b08c4a;
  --accent-red:   #b03a2e;  /* used sparingly for editorial accents */

  --evidence-high:    #2f6b4f;
  --evidence-medium:  #c08416;
  --evidence-early:   #5a6c8a;
  --evidence-caution: #9b3d2c;

  /* Typography */
  --serif: "Noto Serif JP", "YuMincho", "Hiragino Mincho ProN", "Times New Roman", serif;
  --sans:  "Inter", "Noto Sans JP", -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN", sans-serif;

  /* Layout */
  --container: 1200px;
  --container-narrow: 880px;
  --radius: 4px;
  --radius-lg: 8px;
  --shadow-sm: 0 1px 2px rgba(10, 31, 61, 0.04);
  --shadow:    0 4px 16px rgba(10, 31, 61, 0.06);
  --shadow-lg: 0 12px 40px rgba(10, 31, 61, 0.08);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--paper);
  color: var(--ink-900);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: var(--navy-700); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

img { max-width: 100%; display: block; }

h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 600;
  color: var(--navy-900);
  letter-spacing: 0.01em;
  line-height: 1.35;
  margin: 0 0 0.6em;
}

h1 { font-size: clamp(2rem, 4vw, 3.2rem); font-weight: 700; letter-spacing: -0.01em; }
h2 { font-size: clamp(1.5rem, 2.8vw, 2.2rem); }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.05rem; }

p { margin: 0 0 1em; }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.container-narrow {
  max-width: var(--container-narrow);
  margin: 0 auto;
  padding: 0 24px;
}

/* ======================
   Top brand bar / nav
   ====================== */
.brand-bar {
  background: var(--navy-900);
  color: #cdd6e3;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 6px 0;
  text-align: center;
  border-bottom: 1px solid var(--navy-800);
}

.site-header {
  background: var(--white);
  border-bottom: 1px solid var(--ink-200);
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(6px);
}

.site-header .inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  max-width: var(--container);
  margin: 0 auto;
}

.logo {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 1.35rem;
  color: var(--navy-900);
  letter-spacing: 0.02em;
  display: flex;
  align-items: baseline;
  gap: 8px;
}
.logo .logo-mark {
  display: inline-block;
  width: 28px; height: 28px;
  background: var(--navy-900);
  color: #fff;
  font-family: var(--serif);
  font-weight: 700;
  font-size: 14px;
  line-height: 28px;
  text-align: center;
  border-radius: 50%;
  position: relative;
  top: 4px;
}
.logo small {
  font-family: var(--sans);
  font-weight: 400;
  font-size: 0.7rem;
  color: var(--ink-500);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-left: 6px;
}

.nav { display: flex; align-items: center; gap: 28px; }
.nav a {
  color: var(--ink-700);
  font-size: 0.92rem;
  font-weight: 500;
}
.nav a:hover { color: var(--navy-900); text-decoration: none; }

.nav-cta {
  display: inline-block;
  background: var(--navy-900);
  color: #fff !important;
  padding: 10px 18px;
  border-radius: var(--radius);
  font-size: 0.88rem !important;
  font-weight: 600 !important;
  letter-spacing: 0.02em;
}
.nav-cta:hover { background: var(--navy-700); text-decoration: none; }

.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 22px;
  color: var(--navy-900);
  cursor: pointer;
}

@media (max-width: 768px) {
  .nav { display: none; position: absolute; top: 100%; left: 0; right: 0;
    background: #fff; border-bottom: 1px solid var(--ink-200);
    flex-direction: column; gap: 0; padding: 12px 0; }
  .nav.open { display: flex; }
  .nav a { padding: 12px 24px; width: 100%; }
  .menu-toggle { display: block; }
}

/* ======================
   Buttons
   ====================== */
.btn {
  display: inline-block;
  padding: 14px 28px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all .15s ease;
  text-align: center;
}
.btn-primary {
  background: var(--navy-900);
  color: #fff;
}
.btn-primary:hover { background: var(--navy-700); text-decoration: none; }
.btn-outline {
  background: transparent;
  color: var(--navy-900);
  border-color: var(--navy-900);
}
.btn-outline:hover { background: var(--navy-900); color: #fff; text-decoration: none; }
.btn-ghost {
  background: transparent;
  color: var(--ink-700);
  padding: 10px 18px;
}
.btn-ghost:hover { color: var(--navy-900); text-decoration: none; }
.btn-block { display: block; width: 100%; }
.btn-lg { padding: 16px 36px; font-size: 1rem; }

/* ======================
   Section
   ====================== */
section { padding: 80px 0; }
@media (max-width: 768px) { section { padding: 56px 0; } }

.section-eyebrow {
  font-family: var(--sans);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-blue);
  margin-bottom: 12px;
}

.divider-rule {
  border: none;
  border-top: 1px solid var(--ink-200);
  margin: 56px 0;
}

.editorial-rule {
  width: 60px;
  height: 2px;
  background: var(--navy-900);
  margin: 0 0 24px;
  border: none;
}

/* ======================
   Cards
   ====================== */
.card {
  background: #fff;
  border: 1px solid var(--ink-200);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: box-shadow .2s ease, transform .2s ease;
}
.card:hover { box-shadow: var(--shadow); }

.article-card {
  background: #fff;
  border: 1px solid var(--ink-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: box-shadow .2s ease, transform .2s ease;
}
.article-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}
.article-card .body { padding: 24px; flex: 1; display: flex; flex-direction: column; }
.article-card .meta-top {
  display: flex; align-items: center; gap: 10px;
  font-size: 0.78rem; color: var(--ink-500);
  margin-bottom: 12px;
}
.article-card h3 {
  font-size: 1.18rem;
  margin: 0 0 12px;
  line-height: 1.45;
}
.article-card .summary {
  color: var(--ink-600);
  font-size: 0.92rem;
  line-height: 1.65;
  flex: 1;
  margin: 0 0 16px;
}
.article-card .meta-bottom {
  display: flex; align-items: center; justify-content: space-between;
  font-size: 0.78rem; color: var(--ink-500);
  padding-top: 14px;
  border-top: 1px solid var(--ink-100);
}
.article-card .meta-bottom .left { display: flex; gap: 14px; }
.article-card .meta-bottom .icon { display: inline-flex; align-items: center; gap: 4px; }

/* Category tag */
.cat-tag {
  display: inline-block;
  font-family: var(--serif);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--navy-900);
  letter-spacing: 0.05em;
  padding: 0;
  border-bottom: 2px solid var(--accent-gold);
  padding-bottom: 1px;
}
.cat-tag.is-pill {
  background: var(--paper-2);
  border: 1px solid var(--ink-200);
  border-bottom: 1px solid var(--ink-200);
  border-radius: 999px;
  padding: 4px 12px;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--navy-700);
}

/* Evidence label */
.ev-label {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: 3px;
  background: var(--ink-100);
  color: var(--ink-700);
}
.ev-high   { background: #e3f0ea; color: var(--evidence-high); }
.ev-medium { background: #fbf1de; color: var(--evidence-medium); }
.ev-early  { background: #eaedf3; color: var(--evidence-early); }
.ev-caution{ background: #fae6e2; color: var(--evidence-caution); }

/* ======================
   Footer
   ====================== */
.site-footer {
  background: var(--navy-900);
  color: #b9c4d6;
  padding: 64px 0 32px;
  font-size: 0.9rem;
}
.site-footer .footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
}
.site-footer h4 {
  color: #fff;
  font-family: var(--sans);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.site-footer a { color: #b9c4d6; display: block; padding: 4px 0; font-size: 0.88rem; }
.site-footer a:hover { color: #fff; text-decoration: none; }
.site-footer .brand-block .logo {
  color: #fff;
  margin-bottom: 16px;
}
.site-footer .brand-block .logo small { color: #93a3bd; }
.site-footer .brand-block p { color: #93a3bd; font-size: 0.85rem; line-height: 1.7; }
.site-footer .copyright {
  border-top: 1px solid #1c3a66;
  margin-top: 48px; padding-top: 24px;
  display: flex; justify-content: space-between;
  font-size: 0.8rem; color: #6f8298;
  flex-wrap: wrap; gap: 12px;
}

@media (max-width: 768px) {
  .site-footer .footer-grid { grid-template-columns: 1fr; gap: 32px; }
}

/* ======================
   Forms
   ====================== */
.form-group { margin-bottom: 18px; }
.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--ink-700);
  margin-bottom: 6px;
}
.form-control {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--ink-300);
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-family: var(--sans);
  background: #fff;
  color: var(--ink-900);
  transition: border-color .15s ease, box-shadow .15s ease;
}
.form-control:focus {
  outline: none;
  border-color: var(--navy-700);
  box-shadow: 0 0 0 3px rgba(28, 58, 102, 0.12);
}
textarea.form-control { resize: vertical; min-height: 100px; }

.form-help {
  font-size: 0.8rem;
  color: var(--ink-500);
  margin-top: 6px;
}

/* ======================
   Utility
   ====================== */
.text-center { text-align: center; }
.text-muted { color: var(--ink-500); }
.text-serif { font-family: var(--serif); }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mt-2 { margin-top: 16px; }
.mt-4 { margin-top: 32px; }
.mb-2 { margin-bottom: 16px; }
.mb-4 { margin-bottom: 32px; }
.flex { display: flex; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.gap-2 { gap: 16px; }
.gap-3 { gap: 24px; }

.badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--ink-100);
  color: var(--ink-700);
  letter-spacing: 0.04em;
}
.badge-trial { background: #e3f0ea; color: var(--evidence-high); }
.badge-active { background: #e0ebf7; color: var(--accent-blue); }
.badge-canceled { background: var(--ink-100); color: var(--ink-600); }

/* Notice / disclaimer */
.disclaimer {
  background: var(--paper-2);
  border-left: 3px solid var(--ink-400);
  padding: 16px 20px;
  font-size: 0.85rem;
  color: var(--ink-600);
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 24px 0;
}

/* ======================
   Hero (LP)
   ====================== */
.hero {
  padding: 96px 0 80px;
  background:
    radial-gradient(ellipse at top, rgba(28,58,102,0.05), transparent 60%),
    var(--paper);
  text-align: center;
  border-bottom: 1px solid var(--ink-200);
}
.hero .eyebrow {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent-blue);
  margin-bottom: 28px;
}
.hero h1 {
  font-family: var(--serif);
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  line-height: 1.3;
  margin: 0 auto 24px;
  max-width: 880px;
  color: var(--navy-900);
}
.hero .lede {
  font-size: 1.08rem;
  color: var(--ink-600);
  max-width: 640px;
  margin: 0 auto 40px;
  line-height: 1.85;
}
.hero .cta-row {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 28px;
}
.hero .micro-meta {
  display: flex; gap: 28px; justify-content: center; flex-wrap: wrap;
  font-size: 0.85rem; color: var(--ink-500);
}
.hero .micro-meta span { display: inline-flex; align-items: center; gap: 6px; }

/* ======================
   Member layout (sidebar)
   ====================== */
.app-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  min-height: calc(100vh - 70px);
}
.app-sidebar {
  background: #fff;
  border-right: 1px solid var(--ink-200);
  padding: 28px 0;
  position: sticky;
  top: 70px;
  height: calc(100vh - 70px);
  overflow-y: auto;
}
.app-sidebar .section-title {
  padding: 0 24px;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-500);
  margin: 24px 0 8px;
}
.app-sidebar .section-title:first-child { margin-top: 0; }
.app-sidebar a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 24px;
  color: var(--ink-700);
  font-size: 0.92rem;
  border-left: 3px solid transparent;
}
.app-sidebar a:hover { background: var(--ink-50); text-decoration: none; }
.app-sidebar a.active {
  background: var(--ink-50);
  color: var(--navy-900);
  border-left-color: var(--navy-900);
  font-weight: 600;
}
.app-main { padding: 40px 48px; }

@media (max-width: 900px) {
  .app-layout { grid-template-columns: 1fr; }
  .app-sidebar {
    position: static;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--ink-200);
    padding: 16px 0;
  }
  .app-sidebar a { padding: 8px 16px; }
  .app-main { padding: 24px 20px; }
}

/* Article detail typography */
.article-body {
  max-width: 720px;
  margin: 0 auto;
  font-family: var(--serif);
  font-size: 1.08rem;
  line-height: 1.9;
  color: var(--ink-900);
}
.article-body h2, .article-body h3 {
  font-family: var(--serif);
  margin-top: 2em;
  margin-bottom: 0.6em;
}
.article-body h2 {
  font-size: 1.5rem;
  border-top: 1px solid var(--ink-200);
  padding-top: 1.5em;
}
.article-body p { margin-bottom: 1.2em; }
.article-body ul { padding-left: 1.4em; margin: 0 0 1.5em; }
.article-body ul li { margin-bottom: 0.6em; }

.kicker-headline {
  font-family: var(--serif);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  line-height: 1.3;
  color: var(--navy-900);
  margin: 16px 0 24px;
}

/* Audio player */
.audio-player {
  background: #fff;
  border: 1px solid var(--ink-200);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 16px;
}
.audio-player .play-btn {
  width: 48px; height: 48px; border-radius: 50%;
  background: var(--navy-900); color: #fff;
  border: none; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}
.audio-player .play-btn:hover { background: var(--navy-700); }
.audio-player .progress {
  flex: 1;
  height: 4px;
  background: var(--ink-200);
  border-radius: 2px;
  overflow: hidden;
  cursor: pointer;
}
.audio-player .progress .bar {
  height: 100%;
  width: 0%;
  background: var(--navy-700);
  transition: width .1s linear;
}
.audio-player .time {
  font-family: var(--sans);
  font-size: 0.82rem;
  color: var(--ink-600);
  min-width: 88px;
  text-align: right;
}
.audio-player .speed-btn {
  background: var(--paper-2);
  border: 1px solid var(--ink-200);
  border-radius: var(--radius);
  padding: 6px 10px;
  font-size: 0.8rem;
  cursor: pointer;
  color: var(--ink-700);
  font-weight: 600;
}
.audio-player .speed-btn:hover { background: var(--ink-100); }

/* Filter row */
.filter-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--ink-200);
  margin-bottom: 28px;
}
.filter-row .filter-tab {
  padding: 12px 0;
  margin-right: 24px;
  background: none; border: none;
  font-family: var(--sans); font-size: 0.92rem;
  color: var(--ink-500);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  font-weight: 500;
}
.filter-row .filter-tab.active {
  color: var(--navy-900);
  border-bottom-color: var(--navy-900);
  font-weight: 600;
}
.filter-row .sort-select {
  margin-left: auto;
  padding: 8px 12px;
  border: 1px solid var(--ink-200);
  border-radius: var(--radius);
  font-size: 0.85rem;
  background: #fff;
  color: var(--ink-700);
}

/* Grid utilities */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
@media (max-width: 900px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}
@media (max-width: 1100px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}