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

  /* Design tokens - Light theme (default) */
  :root {
    --color-bg: #faf8f5;
    --color-bg-hover: #ebe8e2;
    --color-text: #1a1a1a;
    --color-text-secondary: #666;
    --color-text-muted: #727272;
    --color-text-visited: #707070;
    --color-accent: #2361a1;
    --color-accent-hover: #1a4a7a;
    --color-accent-light: #5a9fd4;
    --color-border: #ddd;
    --color-input-bg: #fff;
    --color-kbd-bg: #f0ede8;
    --color-accent-line: #0091da;
    --color-accent-line-end: #006ba6;
    --color-focus-ring: rgba(35, 97, 161, 0.1);
    --color-focus-shadow: rgba(35, 97, 161, 0.3);
    --color-scrollbar-track: rgba(0, 0, 0, 0.1);
    --color-scrollbar-thumb: rgba(35, 97, 161, 0.62);
    --color-scrollbar-thumb-hover: rgba(35, 97, 161, 0.78);
    --grain-opacity: 0.08;
    --grain-blend: multiply;
  }

  /* Dark theme tokens */
  [data-theme="dark"] {
    --color-bg: #0d1117;
    --color-bg-hover: #161b22;
    --color-text: #e0e0e0;
    --color-text-secondary: #888;
    --color-text-muted: #888;
    --color-text-visited: #858585;
    --color-accent: #5a9fd4;
    --color-accent-hover: #7ab8e8;
    --color-accent-light: #5a9fd4;
    --color-border: #30363d;
    --color-input-bg: #161b22;
    --color-kbd-bg: #161b22;
    --color-accent-line: #4db8e8;
    --color-accent-line-end: #2a8fc4;
    --color-focus-ring: rgba(90, 159, 212, 0.2);
    --color-focus-shadow: rgba(90, 159, 212, 0.3);
    --color-scrollbar-track: rgba(255, 255, 255, 0.14);
    --color-scrollbar-thumb: rgba(122, 184, 232, 0.66);
    --color-scrollbar-thumb-hover: rgba(122, 184, 232, 0.82);
    --grain-opacity: 0.03;
    --grain-blend: screen;
  }

  @media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
      --color-bg: #0d1117;
      --color-bg-hover: #161b22;
      --color-text: #e0e0e0;
      --color-text-secondary: #888;
      --color-text-muted: #888;
      --color-text-visited: #858585;
      --color-accent: #5a9fd4;
      --color-accent-hover: #7ab8e8;
      --color-accent-light: #5a9fd4;
      --color-border: #30363d;
      --color-input-bg: #161b22;
      --color-kbd-bg: #161b22;
      --color-accent-line: #4db8e8;
      --color-accent-line-end: #2a8fc4;
      --color-focus-ring: rgba(90, 159, 212, 0.2);
      --color-scrollbar-track: rgba(255, 255, 255, 0.14);
      --color-scrollbar-thumb: rgba(122, 184, 232, 0.66);
      --color-scrollbar-thumb-hover: rgba(122, 184, 232, 0.82);
      --grain-opacity: 0.03;
      --grain-blend: screen;
    }
  }

  body {
    font-family: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    font-size: clamp(16px, 1.1vw, 18px);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    position: relative;
  }

  /* Subtle grain texture overlay */
  body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    opacity: var(--grain-opacity);
    mix-blend-mode: var(--grain-blend);
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='3.5' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
    z-index: 9999;
  }

  /* Page load fade-in */
  @keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
  }
  .container {
    animation: fadeIn 0.3s ease-out;
  }

  /* Top accent line */
  body::before {
    content: '';
    display: block;
    height: 2px;
    background: linear-gradient(90deg, var(--color-accent-line) 0%, var(--color-accent-line-end) 100%);
  }

  /* Skip link for keyboard/screen reader users */
  .skip-link {
    position: absolute;
    left: -9999px;
    top: 0;
    background: var(--color-accent);
    color: var(--color-bg);
    padding: 8px 16px;
    text-decoration: none;
    font-size: 14px;
    z-index: 10000;
    border-radius: 0 0 4px 0;
  }
  .skip-link:focus {
    left: 0;
    outline: 2px solid var(--color-accent-hover);
    outline-offset: 2px;
  }

  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 clamp(16px, 4vw, 40px);
  }

  /* Header */
  header {
    padding: 16px 0;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
  }

  @media (max-width: 767px) {
    header {
      flex-wrap: wrap;
      gap: 12px;
    }
    .logo {
      flex: 1;
    }
    .header-controls {
      width: 100%;
      order: 1;
    }
    .search-box {
      flex: 1;
    }
    .search-input {
      width: 100%;
    }
    .search-input:focus {
      width: 100%;
    }
  }

  .logo {
    font-family: "Lora", Georgia, "Times New Roman", serif;
    font-size: clamp(25px, 1.73vw, 28px);
    font-weight: 700;
    font-style: italic;
    letter-spacing: -0.01em;
  }
  .logo a {
    color: var(--color-accent);
    text-decoration: none;
  }
  .logo a:hover { color: var(--color-accent); }

  .header-controls {
    display: flex;
    align-items: center;
    gap: 12px;
  }

  .search-box {
    position: relative;
    display: flex;
    align-items: center;
  }

  .search-input {
    width: 200px;
    padding: 6px 28px 6px 10px;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    font-size: clamp(14px, 0.94vw, 15px);
    background: var(--color-input-bg);
    color: var(--color-text);
    transition: width 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  }
  .search-input:focus {
    outline: none;
    border-color: var(--color-accent);
    width: 220px;
    box-shadow: 0 0 0 3px var(--color-focus-ring);
  }
  .search-input::placeholder {
    color: var(--color-text-muted);
  }

  .search-clear {
    position: absolute;
    right: 4px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    color: var(--color-text-muted);
    padding: 4px 8px;
    min-width: 32px;
    min-height: 32px;
    display: none;
    line-height: 1;
    font-size: 18px;
    transition: color 0.15s ease, background 0.15s ease;
  }
  .search-clear:hover { color: var(--color-text-secondary); background: var(--color-bg-hover); }
  .search-clear:focus {
    outline: none;
    box-shadow: 0 0 0 2px var(--color-focus-shadow);
    color: var(--color-text-secondary);
  }
  .search-input:not(:placeholder-shown) + .search-clear { display: flex; align-items: center; justify-content: center; }

  @media (max-width: 767px) {
    .search-clear {
      min-width: 44px;
      min-height: 44px;
      right: 0;
      font-size: 20px;
    }
  }

  .theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-text-secondary);
    transition: color 0.2s;
    padding: 13px;
    margin: -13px;
    min-width: 44px;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  .theme-toggle:hover { color: var(--color-accent); }
  .theme-toggle .icon-sun { display: none; }
  .theme-toggle .icon-moon { display: block; }

  /* Main grid */
  main {
    padding: 24px 0;
  }

  .grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 40px;
  }

  @media (max-width: 1024px) {
    .grid { grid-template-columns: repeat(2, 1fr); }
  }
  @media (max-width: 767px) {
    .grid { grid-template-columns: 1fr; }
  }

  /* Source blocks - ghost card on hover */
  .source {
    margin-bottom: 24px;
    padding: 16px 12px 12px 12px;
    border-radius: 6px;
    transition: background 0.2s ease, box-shadow 0.2s ease;
  }
  .source:hover {
    background: rgba(0, 0, 0, 0.03);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
  }
  [data-theme="dark"] .source:hover {
    background: rgba(255, 255, 255, 0.03);
    box-shadow: 0 1px 3px rgba(255, 255, 255, 0.06);
  }
  @media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) .source:hover {
      background: rgba(255, 255, 255, 0.03);
      box-shadow: 0 1px 3px rgba(255, 255, 255, 0.06);
    }
  }

  .source-title {
    font-family: inherit;
    font-size: clamp(16px, 1.1vw, 18px);
    font-weight: 700;
    letter-spacing: 0.01em;
    margin-bottom: 0;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--color-accent-line);
    transition: border-bottom-color 0.15s ease;
  }
  .source-title:hover {
    border-bottom-color: var(--color-accent);
  }
  .source-title a {
    color: var(--color-accent);
    text-decoration: none;
    text-wrap: balance;
    transition: color 0.15s ease;
  }
  .source-title a:hover {
    color: var(--color-accent-hover);
  }

  .source-tag {
    font-size: 0.7em;
    font-weight: 400;
    color: var(--color-text-muted);
    letter-spacing: 0.02em;
  }
  .source-title a:hover .source-tag {
    color: var(--color-accent-hover);
  }

  /* Article list */
  .articles {
    list-style: none;
  }

  .articles li {
    padding: 10px 0;
    border-top: 1px solid rgba(0, 0, 0, 0.06);
    border-left: 2px solid transparent;
    transition: border-left-color 0.15s ease, background 0.15s ease;
  }
  [data-theme="dark"] .articles li {
    border-top-color: rgba(255, 255, 255, 0.06);
  }
  @media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) .articles li {
      border-top-color: rgba(255, 255, 255, 0.06);
    }
  }
  .articles li:first-child {
    border-top: none;
  }
  .articles li:hover {
    border-left-color: var(--color-accent-line);
    background: linear-gradient(90deg, var(--color-bg-hover) 0%, transparent 100%);
  }
  .articles li:hover a {
    transform: translateX(6px);
  }

  .articles a {
    color: var(--color-text);
    text-decoration: none;
    display: block;
    line-height: 1.45;
    text-wrap: pretty;
    transition: transform 0.15s ease;
  }
  .articles a:visited { color: var(--color-text-visited); }
  .articles a:hover {
    color: var(--color-text);
  }

  /* New badge - original image style with fade support */
  .new-badge {
    height: 14px;
    vertical-align: middle;
    margin-left: 5px;
    transition: opacity 0.3s ease;
  }

  /* Footer */
  footer {
    padding: 32px 0;
    margin-top: 32px;
    border-top: 1px solid var(--color-border);
    text-align: center;
  }

  .footer-info {
    font-size: clamp(14px, 0.94vw, 15px);
    color: var(--color-text-secondary);
    margin-bottom: 8px;
    font-variant-numeric: tabular-nums;
  }
  .footer-info a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color 0.15s ease;
  }
  .footer-info a:hover { color: var(--color-accent-hover); }
  .footer-info a:hover svg { fill: #f26522; }
  .footer-info svg {
    vertical-align: -2px;
    margin-right: 4px;
    fill: var(--color-accent);
    transition: fill 0.15s ease;
  }

  .footer-shortcuts {
    font-size: clamp(13px, 0.87vw, 14px);
    color: var(--color-text-muted);
    opacity: 0.7;
  }
  .footer-shortcuts kbd {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, monospace;
    background: var(--color-kbd-bg);
    border-radius: 3px;
    padding: 2px 6px;
    font-size: clamp(11px, 0.79vw, 12px);
    border: 1px solid var(--color-border);
  }

  /* Dark mode - icon switching (colors handled by tokens) */
  [data-theme="dark"] .theme-toggle .icon-sun { display: block; }
  [data-theme="dark"] .theme-toggle .icon-moon { display: none; }

  /* Today's Articles section */
  .today-section {
    margin-bottom: 24px;
    border-bottom: 1px solid var(--color-border);
    overflow: visible;
  }

  .today-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 0;
    cursor: pointer;
    user-select: none;
    /* Button reset */
    background: none;
    border: 0;
    width: 100%;
    text-align: left;
    font: inherit;
    color: inherit;
  }
  .today-header:hover .today-title,
  .today-header:hover .today-toggle {
    color: var(--color-accent);
  }
  .today-header:focus-visible {
    outline: none;
    box-shadow: 0 0 0 2px var(--color-focus-shadow);
    border-radius: 4px;
  }

  .today-title {
    font-family: inherit;
    font-size: clamp(16px, 1.1vw, 18px);
    font-weight: 600;
    color: var(--color-text);
    display: inline-flex;
    align-items: baseline;
    gap: 3px;
    transition: color 0.15s ease;
  }
  .today-count {
    color: var(--color-text-muted);
    font-weight: 400;
  }
  .today-count::before {
    content: "·\00a0";
  }

  .today-toggle {
    color: var(--color-text-muted);
    transition: color 0.15s ease;
    padding: 4px 8px;
    display: flex;
    align-items: center;
    gap: 4px;
  }
  .today-toggle-icon {
    transition: transform 0.2s ease;
    display: flex;
  }
  .today-section.expanded .today-toggle-icon {
    transform: rotate(180deg);
  }
  @media (max-width: 767px) {
    .today-toggle {
      padding: 8px 12px;
    }
  }

  .today-list {
    list-style: none;
    max-height: 0;
    overflow: hidden;
    padding-bottom: 0;
    transition: max-height 0.25s ease, padding-bottom 0.25s ease;
  }
  .today-section.expanded .today-list {
    max-height: 600px;
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 12px;
  }
  .today-list {
    scrollbar-width: thin;
    scrollbar-color: var(--color-scrollbar-thumb) var(--color-scrollbar-track);
  }
  .today-list::-webkit-scrollbar {
    width: 12px;
  }
  .today-list::-webkit-scrollbar-track {
    background: var(--color-scrollbar-track);
    border-radius: 999px;
  }
  .today-list::-webkit-scrollbar-thumb {
    background: var(--color-scrollbar-thumb);
    border-radius: 999px;
    border: 1px solid transparent;
    background-clip: content-box;
  }
  .today-list::-webkit-scrollbar-thumb:hover {
    background: var(--color-scrollbar-thumb-hover);
    background-clip: content-box;
  }

  .today-list li {
    padding: 8px 0;
    border-top: 1px solid var(--color-border);
    font-size: clamp(15px, 1.05vw, 17px);
  }
  .today-list li:first-child {
    border-top: none;
  }

  .today-list a {
    color: var(--color-text);
    text-decoration: none;
    display: block;
    transition: background 0.15s ease;
  }
  .today-list a:visited {
    color: var(--color-text-visited);
  }
  .today-list a:hover {
    background: linear-gradient(90deg, var(--color-bg-hover) 0%, transparent 100%);
    color: var(--color-text);
  }

  .today-source {
    color: var(--color-text-muted);
    font-size: clamp(13px, 0.9vw, 14px);
  }

  .today-time {
    color: var(--color-text-muted);
    font-size: clamp(12px, 0.83vw, 13px);
    margin-left: 6px;
  }

  .today-empty {
    color: var(--color-text-muted);
    font-style: italic;
    padding: 8px 0;
  }

  /* Keyboard navigation focus state */
  .articles li.kb-focus {
    border-left-color: var(--color-accent-line);
    background: linear-gradient(90deg, var(--color-bg-hover) 0%, transparent 100%);
  }
  .articles li.kb-focus a {
    color: var(--color-text);
    transform: translateX(6px);
  }

  /* Scroll-to-top button */
  .scroll-top {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 44px;
    height: 44px;
    background: var(--color-input-bg);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    color: var(--color-text-secondary);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: opacity 0.25s ease, visibility 0.25s ease, transform 0.25s ease, color 0.15s ease, border-color 0.15s ease;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  .scroll-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
  .scroll-top:hover {
    color: var(--color-accent);
    border-color: var(--color-accent);
  }
  .scroll-top:focus {
    outline: none;
    box-shadow: 0 0 0 2px var(--color-focus-shadow);
  }

  /* Empty search state */
  .empty-state {
    display: none;
    text-align: center;
    padding: 60px 20px;
    color: var(--color-text-secondary);
    font-size: clamp(16px, 1.1vw, 18px);
  }
  .empty-state.visible {
    display: block;
  }
  .empty-state-title {
    margin-bottom: 8px;
  }
  .empty-state-hint {
    font-size: clamp(14px, 0.94vw, 15px);
    color: var(--color-text-muted);
  }
  .empty-state-clear {
    color: var(--color-accent);
    cursor: pointer;
    text-decoration: underline;
    background: none;
    border: none;
    font: inherit;
  }
  .empty-state-clear:hover {
    color: var(--color-accent-hover);
  }
  .empty-state-clear:focus {
    outline: none;
    box-shadow: 0 0 0 2px var(--color-focus-shadow);
    border-radius: 2px;
  }

  /* System preference: icon switching (colors handled by tokens) */
  @media (prefers-color-scheme: dark) {
    html:not([data-theme="light"]) .theme-toggle .icon-sun { display: block; }
    html:not([data-theme="light"]) .theme-toggle .icon-moon { display: none; }
  }

  /* Reduced motion for users who prefer it */
  @media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
      animation-duration: 0.01ms !important;
      animation-iteration-count: 1 !important;
      transition-duration: 0.01ms !important;
      scroll-behavior: auto !important;
    }
  }