/* ==========================================================
   株次郎 Design Tokens
   ========================================================== */
:root {
  /* Brand */
  --navy-900: #0F1F4D;
  --navy-800: #1E3A8A;
  --navy-700: #2D4FB8;
  --navy-600: #3B66D9;
  --navy-100: #E5ECFB;
  --navy-50:  #F2F6FE;

  --gold-600: #D88718;
  --gold-500: #F5A623;
  --gold-400: #FFC15C;
  --gold-100: #FFF1D6;

  --orange-500: #F97316;
  --orange-100: #FFEAD8;

  --green-600: #059669;
  --green-500: #10B981;
  --green-100: #D1FAE5;

  --ink-900: #0E1530;
  --ink-700: #38436B;
  --ink-500: #6B7593;
  --ink-300: #B6BCD2;
  --ink-200: #DCE0EE;
  --ink-100: #ECEFF7;
  --ink-50:  #F6F7FB;

  --bg: #FAFBFE;
  --white: #FFFFFF;

  --shadow-sm: 0 1px 2px rgba(15, 31, 77, .06), 0 1px 1px rgba(15, 31, 77, .04);
  --shadow-md: 0 6px 18px rgba(15, 31, 77, .08), 0 2px 4px rgba(15, 31, 77, .04);
  --shadow-lg: 0 18px 40px rgba(15, 31, 77, .12), 0 4px 8px rgba(15, 31, 77, .04);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  --font-jp: "Zen Maru Gothic", "Hiragino Maru Gothic ProN", "Hiragino Sans", system-ui, sans-serif;
  --font-en: "Plus Jakarta Sans", "Inter", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  font-family: var(--font-jp);
  color: var(--ink-900);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
button { font-family: inherit; cursor: pointer; border: 0; background: none; color: inherit; }
a { color: inherit; text-decoration: none; }

/* ====== Prototype shell (screen tabs) ====== */
.proto-shell {
  position: fixed;
  inset: auto 0 16px 0;
  z-index: 1000;
  display: flex;
  justify-content: center;
  pointer-events: none;
}
.proto-tabs {
  pointer-events: auto;
  display: inline-flex;
  gap: 4px;
  background: rgba(15, 31, 77, .92);
  backdrop-filter: blur(12px);
  padding: 6px;
  border-radius: 999px;
  box-shadow: var(--shadow-lg);
}
.proto-tab {
  font-family: var(--font-jp);
  font-size: 13px;
  font-weight: 600;
  color: rgba(255,255,255,.7);
  padding: 8px 16px;
  border-radius: 999px;
  transition: all .2s;
  white-space: nowrap;
}
.proto-tab:hover { color: white; }
.proto-tab.active {
  background: var(--gold-500);
  color: var(--navy-900);
}
.proto-tab .num {
  font-family: var(--font-en);
  font-size: 11px;
  margin-right: 6px;
  opacity: .7;
}
.proto-tab.active .num { opacity: 1; }

/* ====== App chrome (sidebar + content) ====== */
.app {
  display: grid;
  grid-template-columns: 240px 1fr;
  min-height: 100vh;
}
.app.no-sidebar { grid-template-columns: 1fr; }

.sidebar {
  background: var(--white);
  border-right: 1px solid var(--ink-100);
  padding: 24px 16px 100px;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}
.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 4px 8px 22px;
}
.sidebar-logo .mark {
  width: 36px; height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--navy-700), var(--navy-800));
  display: grid; place-items: center;
  color: white;
  font-weight: 800;
  font-family: var(--font-en);
  font-size: 18px;
  box-shadow: 0 4px 12px rgba(45, 79, 184, .35);
}
.sidebar-logo .name { font-weight: 700; font-size: 17px; letter-spacing: .02em; }
.sidebar-logo .name small { display:block; font-size:10px; color:var(--ink-500); font-weight:500; letter-spacing:.1em; font-family: var(--font-en); }

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 10px 12px;
  border-radius: 10px;
  color: var(--ink-700);
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 2px;
  text-align: left;
}
.nav-item:hover { background: var(--ink-50); }
.nav-item.active {
  background: var(--navy-50);
  color: var(--navy-800);
}
.nav-item .ico { width: 18px; height: 18px; flex-shrink: 0; }

.nav-section-label {
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--ink-500);
  font-weight: 700;
  text-transform: uppercase;
  font-family: var(--font-en);
  padding: 16px 12px 6px;
}

.content {
  padding: 28px 36px 120px;
  max-width: 1200px;
  width: 100%;
}

/* Streak card in sidebar */
.streak-card {
  margin-top: 24px;
  background: linear-gradient(135deg, #FFF1D6, #FFEAD8);
  border-radius: 14px;
  padding: 14px;
  text-align: center;
}
.streak-num { font-size: 26px; font-weight: 800; color: var(--gold-600); display:flex; align-items:baseline; justify-content:center; gap:4px; }
.streak-num span:last-child { font-size: 13px; }
.streak-label { font-size: 12px; font-weight: 700; color: var(--ink-700); margin-top: 2px; }
.streak-dots { display: flex; justify-content: center; gap: 4px; margin: 10px 0 6px; }
.streak-dots .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--ink-200); }
.streak-dots .dot.on { background: var(--gold-500); }
.streak-foot { font-size: 10px; color: var(--ink-500); }

.sidebar-legal {
  margin-top: 20px;
  padding: 16px 12px 12px;
  border-top: 1px solid rgba(255,255,255,.10);
  display: flex;
  flex-wrap: wrap;
  gap: 6px 12px;
}
.sidebar-legal a {
  font-size: 10px;
  color: rgba(255,255,255,.45);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.sidebar-legal a:hover { color: rgba(255,255,255,.75); }
.sidebar-copyright {
  width: 100%;
  font-size: 10px;
  color: rgba(255,255,255,.30);
  margin-top: 4px;
}

/* Mascot image accents */
.mascot { line-height: 0; }
.mascot-spark {
  position: absolute;
  font-size: 22px;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,.15));
  animation: sparkle 2.4s ease-in-out infinite;
  pointer-events: none;
}
@keyframes sparkle { 0%,100% { transform: scale(1) rotate(0); opacity:.9 } 50% { transform: scale(1.2) rotate(15deg); opacity: 1 } }

/* ====== Buttons ====== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 14px;
  transition: all .15s;
  white-space: nowrap;
}
.btn-primary {
  background: var(--gold-500);
  color: var(--navy-900);
  box-shadow: 0 4px 0 var(--gold-600), 0 8px 16px rgba(245, 166, 35, .3);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 5px 0 var(--gold-600), 0 10px 18px rgba(245, 166, 35, .35); }
.btn-primary:active { transform: translateY(2px); box-shadow: 0 2px 0 var(--gold-600), 0 4px 10px rgba(245, 166, 35, .25); }

.btn-navy {
  background: var(--navy-800);
  color: white;
  box-shadow: 0 4px 0 var(--navy-900);
}
.btn-navy:hover { transform: translateY(-1px); }
.btn-navy:active { transform: translateY(2px); box-shadow: 0 2px 0 var(--navy-900); }

.btn-ghost {
  background: var(--white);
  color: var(--navy-800);
  border: 1.5px solid var(--ink-200);
}
.btn-ghost:hover { border-color: var(--navy-700); background: var(--navy-50); }

.btn-lg { padding: 16px 28px; font-size: 16px; }

/* ====== Cards ====== */
.card {
  background: var(--white);
  border: 1px solid var(--ink-100);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

/* ====== Misc ====== */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 700;
  font-family: var(--font-en);
  letter-spacing: .05em;
}
.tag-gold { background: var(--gold-100); color: var(--gold-600); }
.tag-green { background: var(--green-100); color: var(--green-600); }
.tag-navy { background: var(--navy-100); color: var(--navy-800); }
.tag-gray { background: var(--ink-100); color: var(--ink-500); }
.tag-orange { background: var(--orange-100); color: #C2410C; }

.progress {
  height: 10px;
  background: var(--ink-100);
  border-radius: 999px;
  overflow: hidden;
  position: relative;
}
.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--navy-700), var(--navy-600));
  border-radius: 999px;
  transition: width .8s cubic-bezier(.2,.8,.2,1);
  position: relative;
}
.progress-fill.gold { background: linear-gradient(90deg, var(--gold-500), var(--gold-400)); }
.progress-fill.green { background: linear-gradient(90deg, var(--green-500), #34D399); }

/* ====== Mobile top app bar (hidden on desktop) ====== */
.mobile-appbar {
  display: none;
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--ink-100);
  padding: 10px 16px;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  box-shadow: 0 1px 0 var(--ink-100);
}
.mobile-appbar .mb-logo {
  display: flex; align-items: center; gap: 8px;
  font-weight: 800; font-size: 16px; color: var(--navy-900);
}
.mobile-appbar .mb-avatar {
  width: 32px; height: 32px; border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--gold-400);
  box-shadow: 0 2px 6px rgba(245, 166, 35, .3);
}
.mobile-appbar .mb-streak {
  display: flex; align-items: center; gap: 5px;
  background: linear-gradient(135deg, #FFF1D6, #FFEAD8);
  padding: 5px 12px; border-radius: 999px;
  font-size: 12px; font-weight: 800; color: var(--gold-600);
}
.mobile-appbar .mb-streak .mono { font-family: var(--font-en); }

/* ====== Mobile bottom tab bar ====== */
.mobile-tabbar {
  display: none;
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 60;
  background: rgba(255,255,255,.97);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-top: 1px solid var(--ink-100);
  padding: 6px 0 calc(6px + env(safe-area-inset-bottom));
  justify-content: space-around;
  align-items: stretch;
}
.mobile-tabbar .mt-item {
  flex: 1;
  display: flex; flex-direction: column; align-items: center; gap: 3px;
  padding: 6px 4px;
  border-radius: 10px;
  color: var(--ink-400, #8B93B0);
  font-size: 10px; font-weight: 700;
  font-family: var(--font-jp);
  transition: color .15s;
  background: none; border: none; cursor: pointer;
}
.mobile-tabbar .mt-item:disabled { cursor: default; }
.mobile-tabbar .mt-item .ico { font-size: 22px; line-height: 1; transition: transform .15s; }
.mobile-tabbar .mt-item.active { color: var(--navy-800); }
.mobile-tabbar .mt-item.active .ico { transform: scale(1.12); }
.mobile-tabbar .mt-item.mt-locked { opacity: 0.6; }

/* ====== Tablet ====== */
@media (max-width: 1024px) {
  .content { padding: 24px 24px 120px; }
}

/* ====== Mobile (≤768px) ====== */
@media (max-width: 768px) {
  .app { grid-template-columns: 1fr !important; }
  .sidebar { display: none !important; }
  .mobile-appbar { display: flex; }
  .mobile-tabbar { display: flex; }
  .content { padding: 16px 14px 100px; }
  .proto-shell { display: none; }
}

/* ====== Small mobile (≤480px) ====== */
@media (max-width: 480px) {
  .content { padding: 12px 12px 100px; }
  .btn-lg { padding: 14px 22px; font-size: 14px; }
  .btn { padding: 10px 16px; font-size: 13px; }
}

/* utility */
.row { display: flex; }
.col { display: flex; flex-direction: column; }
.gap-4 { gap: 4px; } .gap-8 { gap: 8px; } .gap-12 { gap: 12px; } .gap-16 { gap: 16px; } .gap-24 { gap: 24px; }
.aic { align-items: center; } .jcsb { justify-content: space-between; }
.muted { color: var(--ink-500); }
.mono { font-family: var(--font-en); }

/* 画像出典注記 */
.image-caption {
  font-size: 11px;
  color: #888;
  font-style: italic;
  text-align: center;
  margin-top: -8px;
  margin-bottom: 16px;
  display: block;
}
@media (max-width: 768px) {
  .image-caption { font-size: 10px; }
}