/* ==========================================================================
   NOTE Blog — base design system
   ========================================================================== */

:root{
  --bg: #fbfaf8;
  --bg-elevated: #ffffff;
  --bg-soft: #f2f0ec;
  --text: #1a1a1a;
  --text-muted: #6b6b6b;
  --border: #e7e4de;
  --accent: #5b4bff;
  --accent-2: #ff5b78;
  --accent-soft: #edeaff;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --shadow-sm: 0 1px 2px rgba(20,20,20,.04), 0 1px 1px rgba(20,20,20,.03);
  --shadow-md: 0 8px 24px rgba(20,20,20,.08);
  --shadow-lg: 0 20px 48px rgba(20,20,20,.14);
  --container: 1120px;
  --header-h: 68px;

  --cat-tech: #4f6bff;
  --cat-travel: #12b3a1;
  --cat-food: #ff8a3d;
  --cat-life: #ff5b8a;
  --cat-health: #2fb872;

  color-scheme: light;
}

:root[data-theme="dark"]{
  --bg: #101114;
  --bg-elevated: #16171b;
  --bg-soft: #1c1d22;
  --text: #f0f0f0;
  --text-muted: #9a9aa2;
  --border: #2a2b31;
  --accent: #8c7dff;
  --accent-2: #ff7d92;
  --accent-soft: #232244;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.4);
  --shadow-md: 0 8px 24px rgba(0,0,0,.45);
  --shadow-lg: 0 20px 48px rgba(0,0,0,.55);
  color-scheme: dark;
}

@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg: #101114;
    --bg-elevated: #16171b;
    --bg-soft: #1c1d22;
    --text: #f0f0f0;
    --text-muted: #9a9aa2;
    --border: #2a2b31;
    --accent: #8c7dff;
    --accent-2: #ff7d92;
    --accent-soft: #232244;
    --shadow-sm: 0 1px 2px rgba(0,0,0,.4);
    --shadow-md: 0 8px 24px rgba(0,0,0,.45);
    --shadow-lg: 0 20px 48px rgba(0,0,0,.55);
    color-scheme: dark;
  }
}

*, *::before, *::after{ box-sizing: border-box; }
html{ -webkit-text-size-adjust: 100%; }

html, body{ margin:0; padding:0; }

body{
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN",
    "Noto Sans JP", "Yu Gothic", "Segoe UI", Roboto, sans-serif;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  transition: background-color .25s ease, color .25s ease;
  min-height: 100dvh;
}

img{ max-width:100%; display:block; }
a{ color: inherit; text-decoration: none; }
button{ font: inherit; }
ul{ list-style:none; margin:0; padding:0; }

.container{
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 clamp(16px, 4vw, 32px);
}

/* ---------------------------------- header --------------------------- */

.site-header{
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--border);
}

.site-header .container{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.logo{
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.logo .dot{
  width: 10px; height: 10px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  flex: none;
}

.main-nav{
  display: flex;
  align-items: center;
  gap: 4px;
}

.main-nav a{
  padding: 8px 14px;
  border-radius: 999px;
  font-size: .92rem;
  font-weight: 600;
  color: var(--text-muted);
  transition: background-color .18s ease, color .18s ease;
}

.main-nav a:hover, .main-nav a.is-active{
  background: var(--bg-soft);
  color: var(--text);
}

.header-actions{
  display: flex;
  align-items: center;
  gap: 6px;
}

.icon-btn{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text);
  cursor: pointer;
  flex: none;
}

.icon-btn:hover{ border-color: var(--accent); }
.icon-btn svg{ width: 18px; height: 18px; }

.nav-toggle{ display: none; }

.theme-toggle .icon-moon{ display: none; }
:root[data-theme="dark"] .theme-toggle .icon-sun{ display:none; }
:root[data-theme="dark"] .theme-toggle .icon-moon{ display:inline-flex; }

/* mobile drawer nav */
@media (max-width: 860px){
  .main-nav{
    position: fixed;
    inset: var(--header-h) 0 0 0;
    background: var(--bg);
    flex-direction: column;
    align-items: stretch;
    padding: 18px clamp(16px,4vw,32px) 32px;
    gap: 4px;
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: opacity .2s ease, transform .2s ease, visibility .2s;
    overflow-y: auto;
  }
  .main-nav.is-open{
    opacity: 1;
    transform: translateY(0);
    visibility: visible;
  }
  .main-nav a{
    padding: 14px 16px;
    border-radius: var(--radius-sm);
    font-size: 1.02rem;
    border-bottom: 1px solid var(--border);
  }
  .nav-toggle{
    display: inline-flex;
  }
}

/* ---------------------------------- hero ------------------------------ */

.hero{
  padding: clamp(40px, 8vw, 88px) 0 clamp(28px, 5vw, 48px);
  text-align: center;
}

.hero .eyebrow{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .04em;
  margin-bottom: 20px;
}

.hero h1{
  font-size: clamp(1.9rem, 5.4vw, 3.4rem);
  line-height: 1.25;
  letter-spacing: -0.03em;
  margin: 0 0 16px;
}

.hero .gradient-text{
  background: linear-gradient(100deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero p{
  color: var(--text-muted);
  font-size: clamp(.98rem, 2vw, 1.15rem);
  max-width: 56ch;
  margin: 0 auto;
}

/* search */
.search-box{
  max-width: 520px;
  margin: 28px auto 0;
  position: relative;
}

.search-box input{
  width: 100%;
  padding: 14px 18px 14px 46px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text);
  font-size: 1rem;
  box-shadow: var(--shadow-sm);
}

.search-box input:focus{
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.search-box svg{
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  color: var(--text-muted);
}

/* ---------------------------------- filter tabs ------------------------ */

.filter-bar{
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 4px 0 28px;
  scrollbar-width: none;
}
.filter-bar::-webkit-scrollbar{ display:none; }

.filter-chip{
  flex: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 16px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text-muted);
  font-weight: 700;
  font-size: .88rem;
  cursor: pointer;
  transition: all .18s ease;
  -webkit-tap-highlight-color: transparent;
}

.filter-chip:hover{ border-color: var(--accent); color: var(--text); }

.filter-chip.is-active{
  background: var(--text);
  color: var(--bg);
  border-color: var(--text);
}

.filter-chip .swatch{
  width: 8px; height: 8px;
  border-radius: 50%;
  background: currentColor;
}

/* ---------------------------------- section headings -------------------- */

.section-head{
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin: 0 0 20px;
}

.section-head h2{
  font-size: clamp(1.25rem, 2.6vw, 1.6rem);
  letter-spacing: -0.02em;
  margin: 0;
}

.section-head .count{
  color: var(--text-muted);
  font-size: .9rem;
  font-weight: 600;
}

/* ---------------------------------- card grid --------------------------- */

.article-grid{
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
  gap: clamp(16px, 2.4vw, 26px);
  padding-bottom: 24px;
}

.empty-state{
  display: none;
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
}
.empty-state.is-visible{ display:block; }

.card{
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease;
}

.card:hover{
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: color-mix(in srgb, var(--accent) 40%, var(--border));
}

.card-media{
  aspect-ratio: 16/10;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.6rem;
  position: relative;
  overflow: hidden;
}

.card-media::after{
  content:"";
  position: absolute;
  inset: 0;
  background: radial-gradient(120% 120% at 20% 15%, rgba(255,255,255,.28), transparent 60%);
}

.card-media span{ position: relative; z-index: 1; filter: drop-shadow(0 4px 10px rgba(0,0,0,.15)); }

.card-body{
  padding: 18px 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
}

.tag{
  display: inline-flex;
  align-self: flex-start;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  border-radius: 999px;
  font-size: .74rem;
  font-weight: 800;
  letter-spacing: .02em;
}

.card h3{
  font-size: 1.08rem;
  line-height: 1.5;
  letter-spacing: -0.01em;
  margin: 0;
}

.card p{
  color: var(--text-muted);
  font-size: .89rem;
  line-height: 1.65;
  margin: 0;
  flex: 1;
}

.card-meta{
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: .78rem;
  color: var(--text-muted);
  padding-top: 6px;
  border-top: 1px solid var(--border);
  margin-top: 4px;
}

.card-meta .dot-sep{ width:3px; height:3px; border-radius:50%; background: var(--text-muted); flex:none; }

/* category color helpers */
.c-tech   { background: color-mix(in srgb, var(--cat-tech) 16%, transparent); color: var(--cat-tech); }
.c-travel { background: color-mix(in srgb, var(--cat-travel) 16%, transparent); color: var(--cat-travel); }
.c-food   { background: color-mix(in srgb, var(--cat-food) 16%, transparent); color: var(--cat-food); }
.c-life   { background: color-mix(in srgb, var(--cat-life) 16%, transparent); color: var(--cat-life); }
.c-health { background: color-mix(in srgb, var(--cat-health) 16%, transparent); color: var(--cat-health); }

.m-tech   { background: linear-gradient(135deg, color-mix(in srgb, var(--cat-tech) 85%, white), var(--cat-tech)); }
.m-travel { background: linear-gradient(135deg, color-mix(in srgb, var(--cat-travel) 85%, white), var(--cat-travel)); }
.m-food   { background: linear-gradient(135deg, color-mix(in srgb, var(--cat-food) 85%, white), var(--cat-food)); }
.m-life   { background: linear-gradient(135deg, color-mix(in srgb, var(--cat-life) 85%, white), var(--cat-life)); }
.m-health { background: linear-gradient(135deg, color-mix(in srgb, var(--cat-health) 85%, white), var(--cat-health)); }

/* ---------------------------------- newsletter / cta -------------------- */

.cta-band{
  margin: 48px 0;
  padding: clamp(28px, 5vw, 48px);
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  text-align: center;
}

.cta-band h2{ margin: 0 0 10px; font-size: clamp(1.3rem, 3vw, 1.8rem); }
.cta-band p{ margin: 0 0 22px; opacity: .92; }

.btn{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: 999px;
  font-weight: 700;
  font-size: .95rem;
  border: none;
  cursor: pointer;
}

.btn-light{ background: #fff; color: var(--text); }
.btn-light:hover{ opacity:.92; }

/* ---------------------------------- footer ------------------------------ */

.site-footer{
  border-top: 1px solid var(--border);
  margin-top: 40px;
  padding: 40px 0 calc(32px + env(safe-area-inset-bottom));
  color: var(--text-muted);
}

.footer-grid{
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: 28px;
  margin-bottom: 28px;
}

.footer-grid h4{
  color: var(--text);
  font-size: .85rem;
  margin: 0 0 12px;
}

.footer-grid ul{ display:flex; flex-direction: column; gap: 8px; }
.footer-grid a{ font-size: .88rem; }
.footer-grid a:hover{ color: var(--accent); }

.footer-bottom{
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  font-size: .82rem;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

@media (max-width: 720px){
  .footer-grid{ grid-template-columns: 1fr 1fr; }
}

/* ---------------------------------- article page ------------------------ */

.breadcrumb{
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: .82rem;
  color: var(--text-muted);
  padding: 18px 0 0;
  flex-wrap: wrap;
}
.breadcrumb a:hover{ color: var(--accent); }

.article-hero{
  padding: 18px 0 clamp(20px, 4vw, 32px);
}

.article-hero .tag{ margin-bottom: 16px; }

.article-hero h1{
  font-size: clamp(1.6rem, 4.6vw, 2.6rem);
  line-height: 1.35;
  letter-spacing: -0.02em;
  margin: 0 0 18px;
}

.article-meta{
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  color: var(--text-muted);
  font-size: .88rem;
}

.avatar{
  width: 34px; height: 34px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 800;
  font-size: .82rem;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  flex: none;
}

.article-cover{
  aspect-ratio: 21/9;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  margin: 8px 0 8px;
  position: relative;
  overflow: hidden;
}
.article-cover::after{
  content:"";
  position:absolute; inset:0;
  background: radial-gradient(140% 140% at 15% 10%, rgba(255,255,255,.3), transparent 55%);
}
.article-cover span{ position: relative; z-index:1; filter: drop-shadow(0 6px 14px rgba(0,0,0,.18)); }

.article-body{
  max-width: 72ch;
  margin: 8px auto 0;
  padding: 12px 0 8px;
  font-size: 1.04rem;
}

.article-body h2{
  font-size: clamp(1.2rem, 2.6vw, 1.5rem);
  letter-spacing: -0.01em;
  margin: 2.2em 0 .7em;
}

.article-body h3{
  font-size: 1.08rem;
  margin: 1.8em 0 .6em;
}

.article-body p{ margin: 0 0 1.3em; color: var(--text); }
.article-body p.lead{ font-size: 1.12rem; color: var(--text-muted); }

.article-body ul, .article-body ol{
  margin: 0 0 1.3em;
  padding-left: 1.3em;
}
.article-body li{ margin-bottom: .5em; }
.article-body ul li{ list-style: disc; }
.article-body ol li{ list-style: decimal; }

.article-body blockquote{
  margin: 1.8em 0;
  padding: 6px 0 6px 22px;
  border-left: 3px solid var(--accent);
  color: var(--text-muted);
  font-size: 1.05rem;
  font-style: italic;
}

.article-body .callout{
  margin: 1.8em 0;
  padding: 18px 20px;
  border-radius: var(--radius-md);
  background: var(--accent-soft);
  color: var(--text);
  font-size: .96rem;
}
.article-body .callout strong{ color: var(--accent); }

.article-body table{
  width: 100%;
  border-collapse: collapse;
  margin: 1.6em 0;
  font-size: .92rem;
}
.article-body th, .article-body td{
  padding: 10px 12px;
  border: 1px solid var(--border);
  text-align: left;
}
.article-body th{ background: var(--bg-soft); }

.article-tags{
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 32px 0;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.article-tags a{
  padding: 7px 14px;
  border-radius: 999px;
  background: var(--bg-soft);
  font-size: .82rem;
  font-weight: 700;
  color: var(--text-muted);
}
.article-tags a:hover{ color: var(--accent); }

.share-row{
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 28px 0 12px;
  color: var(--text-muted);
  font-size: .85rem;
  font-weight: 700;
}

.author-card{
  display: flex;
  gap: 16px;
  align-items: flex-start;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 20px;
  margin: 28px 0;
}
.author-card .avatar{ width: 52px; height: 52px; font-size: 1.05rem; }
.author-card h4{ margin: 0 0 4px; font-size: .98rem; }
.author-card p{ margin: 0; color: var(--text-muted); font-size: .86rem; }

.related-heading{
  font-size: 1.2rem;
  letter-spacing: -0.02em;
  margin: 0 0 18px;
}

.back-top{
  position: fixed;
  right: 20px;
  bottom: calc(20px + env(safe-area-inset-bottom));
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all .2s ease;
  z-index: 90;
}
.back-top.is-visible{ opacity: 1; visibility: visible; transform: translateY(0); }
.back-top svg{ width: 18px; height: 18px; }

/* progress bar */
.reading-progress{
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  z-index: 200;
  transition: width .1s linear;
}

/* ---------------------------------- about page --------------------------- */

.page-hero{
  padding: clamp(36px,6vw,64px) 0 20px;
  text-align: center;
}
.page-hero h1{ font-size: clamp(1.8rem,4.6vw,2.6rem); letter-spacing: -0.02em; margin:0 0 12px; }
.page-hero p{ color: var(--text-muted); max-width: 60ch; margin: 0 auto; }

.value-grid{
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px,1fr));
  gap: 18px;
  margin: 36px 0;
}
.value-card{
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 22px;
}
.value-card .emoji{ font-size: 1.8rem; margin-bottom: 12px; }
.value-card h3{ margin: 0 0 8px; font-size: 1rem; }
.value-card p{ margin:0; color: var(--text-muted); font-size: .9rem; }

@media (max-width: 720px){
  .footer-bottom{ flex-direction: column; align-items: flex-start; }
}