:root {
  --bg: #f5f5f5;
  --page: #ffffff;
  --accent: #d5382f;
  --accent-soft: rgba(213, 56, 47, 0.08);
  --text: #111827;
  --muted: #4b5563;
  --border: #e5e7eb;
  --card: #f9fafb;
  --shadow: 0 12px 30px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text",
    "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 32px 16px;
}

.page {
  max-width: 960px;
  width: 100%;
  background: var(--page);
  border-radius: 6px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  padding: 16px 20px 18px;
}

.masthead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin: 0 auto 12px;
  padding: 4px 2px 10px;
  border-bottom: 1px solid var(--border);
  font-size: 12px;
  color: var(--muted);
}

.masthead-left {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: inherit;
}

.masthead-logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 999px;
  background: var(--accent);
  color: #ffffff;
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.06em;
}

.masthead-name {
  text-transform: uppercase;
  letter-spacing: 0.16em;
}

.masthead-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: flex-end;
}

.masthead-tag {
  padding: 2px 8px;
  border-radius: 999px;
  border: 1px solid var(--accent);
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.16em;
}

.masthead-date {
  opacity: 0.8;
}

.shell {
  background: var(--page);
  border-radius: 4px;
  border: 1px solid var(--border);
  padding: 22px 18px 18px;
  position: relative;
  overflow: hidden;
}

.shell::before {
  content: none;
}

.shell > * {
  position: relative;
}

.article {
  max-width: 720px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  margin-bottom: 14px;
}

.dot {
  width: 7px;
  height: 7px;
  border-radius: 999px;
  background: var(--accent);
}

h1 {
  font-size: clamp(32px, 6vw, 44px);
  line-height: 1.05;
  margin-bottom: 10px;
  letter-spacing: -0.04em;
}

.article-header {
  margin-bottom: 10px;
}

.article-meta {
  font-size: 13px;
  color: var(--muted);
}

.article-meta-separator {
  margin: 0 4px;
}

.sub {
  color: var(--muted);
  font-size: 15px;
  line-height: 1.6;
  max-width: 34rem;
}

.article-body {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text);
}

.video-thumb-link {
  display: block;
  margin: 10px 0 18px;
  text-decoration: none;
}

.video-thumb {
  position: relative;
  border-radius: 4px;
  overflow: hidden;
  border: 1px solid var(--border);
  background: #000000;
  box-shadow: 0 10px 20px rgba(15, 23, 42, 0.18);
  aspect-ratio: 16 / 9;
}

.video-thumb-image {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.video-thumb-play {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.video-thumb-play::before {
  content: "";
  width: 54px;
  height: 54px;
  border-radius: 999px;
  background: rgba(17, 24, 39, 0.78);
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.35);
}

.video-thumb-play::after {
  content: "";
  position: absolute;
  width: 0;
  height: 0;
  border-top: 11px solid transparent;
  border-bottom: 11px solid transparent;
  border-left: 18px solid #ffffff;
  transform: translateX(3px);
}

.video-thumb-controls {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 6px 10px 8px;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent);
  pointer-events: none;
}

.video-thumb-controls-inner {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  color: #e5e7eb;
}

.video-thumb-controls-play {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  border: 1px solid rgba(243, 244, 246, 0.9);
  position: relative;
}

.video-thumb-controls-play::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-top: 3px solid transparent;
  border-bottom: 3px solid transparent;
  border-left: 5px solid #f9fafb;
  transform: translate(-40%, -50%);
}

.video-thumb-progress {
  flex: 1;
  height: 4px;
  border-radius: 999px;
  background: rgba(148, 163, 184, 0.6);
  overflow: hidden;
}

.video-thumb-progress-fill {
  width: 0;
  height: 100%;
  background: #ef4444;
}

.video-thumb-time {
  font-variant-numeric: tabular-nums;
  opacity: 0.9;
}

.article-body a {
  color: var(--accent);
}

.article-body a:hover {
  text-decoration: underline;
}

.article-subheading {
  font-size: 18px;
  margin: 20px 0 6px;
}

.article-list {
  margin: 4px 0 10px 18px;
}

.article-list li {
  margin-bottom: 4px;
}

.article-tools {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--muted);
}

.memo-button {
  appearance: none;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: #f3f4f6;
  color: #374151;
  padding: 4px 10px;
  font-size: 13px;
  cursor: pointer;
}

.memo-button:hover {
  background: #e5e7eb;
}

.article-tools-note a {
  color: var(--accent);
}

.footer {
  margin-top: 16px;
  font-size: 13px;
  color: var(--muted);
  max-width: 820px;
}

.footer-link {
  display: inline-block;
  margin-top: 4px;
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px dashed rgba(213, 56, 47, 0.6);
  padding-bottom: 1px;
}

.footer-link:hover {
  color: var(--accent);
  border-bottom-style: solid;
}

.small-print {
  margin-top: 8px;
  font-size: 10px;
  color: #9ca3af;
}

.toast {
  display: none;
}

@media (max-width: 600px) {
  body {
    padding: 18px 10px 24px;
  }

  .shell {
    border-radius: 22px;
  }

  .toast {
    left: 50%;
    bottom: 14px;
    width: calc(100% - 32px);
  }
}