/* ═══════════════════════════════════════════
   BITCOIN バチーン！ – Column Unified Style
   ═══════════════════════════════════════════ */

:root {
  --yellow: #FFD700;
  --orange: #FF6600;
  --red:    #E82020;
  --cyan:   #00F5FF;
  --dark:   #160A00;
  --white:  #FFFDE7;
  --bg:     #FFE200;
}

*, *::before, *::after { box-sizing: border-box; }

/* ── HTML / BODY ── */
html {
  background-color: var(--bg);
  background-image: radial-gradient(circle, rgba(255,102,0,0.14) 1.5px, transparent 1.5px);
  background-size: 22px 22px;
}

body {
  font-family: 'M PLUS Rounded 1c', 'Hiragino Sans', 'Meiryo', sans-serif;
  max-width: 720px;
  margin: 0 auto;
  padding: 0 24px 0;
  color: var(--dark);
  font-size: 16px;
  line-height: 1.9;
  background: white;
  border-left: 5px solid var(--dark);
  border-right: 5px solid var(--dark);
  box-shadow: 10px 0 0 var(--orange), -10px 0 0 var(--orange);
  min-height: 100vh;
}

/* ── NAV HEADER ── */
.col-header {
  background: var(--dark);
  padding: 12px 20px;
  display: flex;
  align-items: center;
  gap: 14px;
  border-bottom: 5px solid var(--orange);
  margin: 0 -24px;
  position: sticky;
  top: 0;
  z-index: 100;
}
.col-header a {
  color: var(--yellow);
  font-family: 'Zen Dots', sans-serif;
  font-size: 11px;
  text-decoration: none;
  border: 2px solid var(--orange);
  padding: 4px 12px;
  border-radius: 20px;
  transition: background .15s;
  white-space: nowrap;
}
.col-header a:hover { background: var(--orange); }
.col-header .col-title {
  font-family: 'Boogaloo', sans-serif;
  font-size: 17px;
  color: var(--yellow);
  letter-spacing: 2px;
  margin-left: auto;
  opacity: .75;
}

/* ── EYECATCH HERO ── */
.column-eyecatch {
  background-color: var(--bg);
  background-image: radial-gradient(circle, rgba(255,102,0,0.14) 1.5px, transparent 1.5px);
  background-size: 22px 22px;
  padding: 40px 20px 32px;
  border-bottom: 5px solid var(--dark);
  margin: 0 -24px;
  text-align: center;
}

.eyecatch-label {
  font-family: 'Boogaloo', sans-serif;
  font-size: 20px;
  font-weight: 900;
  color: var(--dark);
  background: var(--yellow);
  border: 4px solid var(--dark);
  border-radius: 255px 15px 225px 15px / 15px 225px 15px 255px;
  box-shadow: 5px 5px 0 var(--dark);
  padding: 5px 22px;
  letter-spacing: 3px;
  display: inline-block;
  margin-bottom: 18px;
}

.eyecatch-mascot {
  width: 140px;
  height: auto;
  border: 5px solid var(--dark);
  border-radius: 255px 15px 225px 15px / 15px 225px 15px 255px;
  box-shadow: 8px 8px 0 var(--dark);
  background: white;
  padding: 8px;
  display: block;
  margin: 0 auto;
  animation: mascotBob 2.5s ease-in-out infinite alternate;
}
@keyframes mascotBob {
  from { transform: translateY(0) rotate(-2deg); }
  to   { transform: translateY(-14px) rotate(2deg); }
}

/* inner wrapper div in eyecatch (keep compatible) */
.column-eyecatch > div {
  display: flex !important;
  flex-direction: column !important;
  align-items: center !important;
  gap: 0 !important;
}

/* ── H1 ── */
h1 {
  font-family: 'Boogaloo', sans-serif;
  font-size: clamp(18px, 3.2vw, 26px);
  font-weight: 900;
  color: var(--dark);
  line-height: 1.5;
  margin: 1.8em -24px 1em;
  padding: 18px 28px;
  background: var(--yellow);
  border-top: 4px solid var(--dark);
  border-bottom: 4px solid var(--dark);
  box-shadow: inset 0 -4px 0 var(--orange);
  letter-spacing: 0.5px;
}

/* ── H2 ── */
h2 {
  font-family: 'Boogaloo', sans-serif;
  font-size: clamp(17px, 2.8vw, 22px);
  color: var(--yellow);
  background: var(--orange);
  border: 3px solid var(--dark);
  border-radius: 255px 10px 225px 10px / 10px 225px 10px 255px;
  box-shadow: 5px 5px 0 var(--dark);
  padding: 9px 22px;
  margin: 2em 0 0.9em;
  letter-spacing: 1px;
  -webkit-text-stroke: 0.5px rgba(0,0,0,.2);
}

/* ── H3 ── */
h3 {
  font-family: 'Caveat', cursive;
  font-size: clamp(18px, 2.8vw, 22px);
  font-weight: 700;
  color: var(--orange);
  border-left: 5px solid var(--orange);
  padding: 3px 0 3px 14px;
  margin: 1.8em 0 0.6em;
  line-height: 1.5;
}

/* ── BODY TEXT ── */
p { margin: 0 0 1em; font-size: 15.5px; }

p.section-intro {
  font-family: 'Caveat', cursive;
  font-size: 21px; font-weight: 700;
  color: var(--orange);
  margin-top: 1.5em;
}

strong, b { font-weight: 700; color: var(--dark); }
em, i     { font-style: normal; color: var(--orange); font-weight: 700; }

a { color: var(--orange); text-underline-offset: 2px; word-break: break-all; }
a:hover { color: var(--red); }

/* ── SUM LIST ── */
ul.sum-list {
  list-style: none;
  padding: 18px 20px;
  margin: 1.5em 0;
  background: var(--white);
  border: 3px solid var(--dark);
  border-radius: 12px 255px 10px 255px / 255px 10px 255px 8px;
  box-shadow: 6px 6px 0 var(--dark);
}
li.sum-item {
  position: relative;
  padding: 5px 0 5px 24px;
  font-weight: 700;
  color: var(--dark);
  line-height: 1.6;
}
li.sum-item::before {
  content: '⚡';
  position: absolute;
  left: 0;
  color: var(--orange);
}
li.sub-item {
  position: relative;
  padding: 3px 0 3px 32px;
  font-size: 0.93rem;
  color: #444;
  font-weight: 400;
  line-height: 1.6;
}
li.sub-item::before {
  content: '▶';
  position: absolute;
  left: 18px;
  color: var(--orange);
  font-size: 10px;
  top: 7px;
}

/* ── GENERIC LISTS ── */
ul:not(.sum-list), ol { padding-left: 1.6em; margin-bottom: 1em; }
ul:not(.sum-list) li, ol li { margin-bottom: 0.4em; }
ul:not(.sum-list) li::marker { color: var(--orange); }

/* ── ASIDE / NOTE ── */
aside.note {
  background: var(--white);
  border: 3px solid var(--dark);
  border-radius: 255px 15px 225px 15px / 15px 225px 15px 255px;
  box-shadow: 4px 4px 0 var(--dark);
  padding: 12px 20px;
  margin: 1.4em 0;
  font-size: 0.9rem;
  color: #555;
  line-height: 1.8;
}

/* ── BLOCKQUOTE ── */
blockquote {
  border: 3px solid var(--dark);
  background: var(--white);
  border-radius: 10px;
  box-shadow: 4px 4px 0 var(--dark);
  padding: 14px 20px;
  margin: 1.5em 0;
  color: #555;
  font-size: 0.95rem;
  line-height: 1.8;
}

/* ── TABLE ── */
table {
  border-collapse: collapse;
  width: 100%;
  margin: 1.5em 0;
  font-size: 0.92rem;
  border: 3px solid var(--dark);
  overflow: hidden;
  box-shadow: 5px 5px 0 var(--dark);
  border-radius: 4px;
}
th, td { border: 1px solid var(--dark); padding: 9px 14px; }
th {
  background: var(--dark);
  color: var(--yellow);
  font-family: 'Zen Dots', sans-serif;
  font-size: 12px;
  letter-spacing: 1px;
}
tr:nth-child(even) td { background: #fff8f0; }

/* ── IMAGES ── */
img { max-width: 100%; height: auto; }

/* ── YOUTUBE EMBED ── */
.yt-wrap {
  position: relative;
  padding-bottom: 56.25%; /* 16:9 */
  height: 0;
  overflow: hidden;
  margin: 1.5em 0;
  border: 4px solid var(--dark);
  border-radius: 12px;
  box-shadow: 6px 6px 0 var(--dark);
}
.yt-wrap iframe {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  border: 0;
}

/* ── COLUMN NAVIGATION ── */
.col-nav {
  display: flex;
  justify-content: space-between;
  align-items: stretch;
  gap: 12px;
  margin: 48px 0 0;
  padding-top: 28px;
  border-top: 4px solid var(--dark);
}
.col-nav-prev,
.col-nav-next {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 16px;
  border: 3px solid var(--dark);
  border-radius: 12px;
  box-shadow: 4px 4px 0 var(--dark);
  background: var(--yellow);
  color: var(--dark);
  text-decoration: none;
  font-family: 'Boogaloo', sans-serif;
  max-width: 48%;
  transition: background .15s, transform .1s, box-shadow .1s;
  line-height: 1.4;
}
.col-nav-prev { margin-right: auto; }
.col-nav-next { margin-left: auto; text-align: right; }
.col-nav-prev:hover,
.col-nav-next:hover {
  background: var(--orange);
  color: var(--white);
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--dark);
}
.col-nav-label {
  font-size: 11px;
  font-family: 'Zen Dots', sans-serif;
  letter-spacing: 1px;
  opacity: .7;
}
.col-nav-title {
  font-size: 14px;
  font-weight: 900;
}
@media (max-width: 480px) {
  .col-nav { gap: 8px; }
  .col-nav-prev, .col-nav-next { max-width: 49%; padding: 10px 12px; }
  .col-nav-title { font-size: 12px; }
}

/* ── FOOTER STRIPE ── */
body::after {
  content: '';
  display: block;
  height: 8px;
  background: repeating-linear-gradient(90deg,
    var(--yellow) 0 24px, var(--orange) 24px 48px,
    var(--red) 48px 72px, var(--cyan) 72px 96px,
    var(--dark) 96px 120px
  );
  margin: 48px -24px 0;
}

/* ── RESPONSIVE ── */
@media (max-width: 480px) {
  body { padding: 0 14px; border: none; box-shadow: none; }
  .col-header, .column-eyecatch { margin: 0 -14px; }
  h1 { margin-left: -14px; margin-right: -14px; padding: 14px 18px; }
  body::after { margin: 40px -14px 0; }
}