:root {
  color-scheme: dark;
  --ink: #eaf1d7;
  --muted: #a8b99a;
  --line: rgba(185, 225, 218, .14);
  --panel: rgba(7, 24, 26, .84);
  --mint: #c4ed68;
}
* { box-sizing: border-box; }
html { min-height: 100%; background: #071b0c; }
body {
  min-height: 100vh; margin: 0; color: var(--ink);
  font: 16px/1.65 system-ui, sans-serif;
  background:
    radial-gradient(ellipse at 50% 8%, rgba(74, 135, 128, .42), transparent 55%),
    linear-gradient(155deg, #17351b 0%, #071b0c 55%, #102716 100%);
}
.texture {
  position: fixed; inset: 0; z-index: 0; pointer-events: none; opacity: .36;
  background-image: radial-gradient(rgba(159, 220, 208, .72) .65px, transparent .8px);
  background-size: 5px 5px;
  mask-image: linear-gradient(to bottom, #000 0%, transparent 86%);
}
.topbar, main { position: relative; z-index: 1; }
.topbar {
  height: 66px; display: flex; align-items: center; justify-content: space-between;
  padding: 0 max(22px, calc((100vw - 720px) / 2));
  border-bottom: 1px solid var(--line); background: rgba(5, 17, 19, .58);
  backdrop-filter: blur(12px);
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font-weight: 750; letter-spacing: .08em; }
.brand-mark { width: 10px; height: 10px; border-radius: 50%; background: var(--mint); box-shadow: 0 0 18px #c4ed68; }
.top-note, .eyebrow, #counter, footer { color: var(--muted); }
.top-note { font-size: .78rem; }
main { width: min(100% - 32px, 620px); margin: 0 auto; }
.intro { padding: 55px 8px 25px; }
.eyebrow { margin: 0 0 9px; font-size: .67rem; letter-spacing: .2em; }
h1 { margin: 0; font-size: clamp(1.75rem, 7vw, 2.5rem); letter-spacing: .04em; }
h1 span { color: var(--mint); }
.description { margin: 8px 0 0; color: #b6c9c5; }
.composer, article {
  border: 1px solid var(--line); border-radius: 16px;
  background: var(--panel); box-shadow: 0 14px 42px rgba(0, 0, 0, .16);
  backdrop-filter: blur(10px);
}
.composer { padding: 18px; }
.composer label { font-size: .85rem; font-weight: 650; }
textarea {
  display: block; width: 100%; min-height: 112px; margin: 9px 0 12px; padding: 12px;
  border: 1px solid var(--line); border-radius: 10px; outline: none;
  background: rgba(1, 12, 14, .48); color: var(--ink); font: inherit; resize: vertical;
}
textarea:focus { border-color: rgba(158, 226, 208, .65); }
textarea::placeholder { color: #78928e; }
.composer-bottom { display: flex; justify-content: space-between; align-items: center; }
#counter { font-size: .75rem; }
button { font: inherit; cursor: pointer; }
.composer button {
  border: 0; border-radius: 999px; padding: 9px 17px;
  color: #18300d; background: var(--mint); font-weight: 700;
}
button:focus-visible, a:focus-visible, textarea:focus-visible { outline: 2px solid white; outline-offset: 3px; }
#message { margin: 8px 0 0; color: var(--muted); font-size: .82rem; }
.timeline { padding-top: 32px; }
.section-heading { display: flex; align-items: center; gap: 11px; margin: 0 4px 13px; }
h2 { margin: 0; font-size: 1rem; letter-spacing: .05em; }
.live-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--mint); box-shadow: 0 0 10px var(--mint); }
article { padding: 16px 18px; margin-bottom: 10px; }
article small { color: var(--muted); font-size: .75rem; }
article p { margin: 8px 0 0; white-space: pre-wrap; overflow-wrap: anywhere; }
.more-button {
  display: block; margin: 18px auto; padding: 9px 20px;
  border: 1px solid var(--line); border-radius: 999px; color: var(--ink);
  background: rgba(7, 24, 26, .8);
}
.empty { color: var(--muted); text-align: center; padding: 24px 0; }
footer { padding: 32px 0 24px; text-align: center; font-size: .75rem; }
footer span { padding: 0 5px; color: var(--mint); }
@media (max-width: 480px) {
  .topbar { height: 58px; padding-inline: 18px; }
  .top-note { font-size: .69rem; }
  .intro { padding-top: 40px; }
  .composer { padding: 14px; }
}

/* シンプルな単色背景と、細い区切り線 */
body {
  background: #071b0c;
}
.topbar {
  background: #071b0c;
  backdrop-filter: none;
}
main {
  padding-top: 24px;
}
.composer,
article {
  border: 0;
  border-bottom: 1px solid rgba(196, 237, 104, .28);
  border-radius: 0;
  background: transparent;
  box-shadow: none;
  backdrop-filter: none;
}
.composer {
  padding: 10px 4px 18px;
}
article {
  padding: 16px 4px;
  margin-bottom: 0;
}
.timeline {
  padding-top: 22px;
}
.section-heading {
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(196, 237, 104, .28);
}
textarea {
  border-radius: 4px;
  background: rgba(0, 0, 0, .12);
}