/* =========================================================================
   AI agent trends 2026 · composite · Material Design 3 (Google-flavored)
   Pure CSS, no preprocessor, no build step. Light + dark, EN/中文 full page.
   Primary seed: Google blue. Five per-trend accent colors (t1..t5) echo the
   report's pink → orange → green → teal → blue trend imagery.
   ========================================================================= */

/* ---- MD3 design tokens : LIGHT (default) ---- */
:root,
[data-theme="light"] {
  --primary:             #0B57D0;
  --on-primary:          #FFFFFF;
  --primary-container:   #D3E3FD;
  --on-primary-container:#041E49;
  --secondary:           #4C6584;
  --secondary-container: #DCE9FB;
  --on-secondary-container:#0A2A4D;
  --tertiary:            #9A4600;
  --tertiary-container:  #FFDCC2;
  --on-tertiary-container:#321300;

  --background:          #FBFCFE;
  --on-background:       #1A1C1E;
  --surface:             #FBFCFE;
  --surface-container:   #F0F4F9;
  --surface-container-high:#E8EEF6;
  --surface-variant:     #DEE3EB;
  --on-surface:          #1A1C1E;
  --on-surface-variant:  #44474E;

  --outline:             #74777F;
  --outline-variant:     #C4C7CF;
  --error:               #B3261E;
  --shadow:              rgba(11,33,63,.16);

  /* per-trend accents + soft container */
  --t1: #C9166B; --t1-soft: #FBE0EE;
  --t2: #B55700; --t2-soft: #FCE7D2;
  --t3: #1E7B3E; --t3-soft: #D8F1DF;
  --t4: #00747E; --t4-soft: #CFEFF1;
  --t5: #1153C4; --t5-soft: #DCE7FB;

  --elev-1: 0 1px 2px rgba(11,33,63,.10), 0 1px 3px 1px rgba(11,33,63,.06);
  --elev-2: 0 2px 6px 2px rgba(11,33,63,.10), 0 1px 2px rgba(11,33,63,.10);
  --elev-3: 0 8px 24px 2px rgba(11,33,63,.16), 0 2px 6px rgba(11,33,63,.10);

  --radius-sm: 10px;
  --radius:    18px;
  --radius-lg: 28px;

  --font-body: "Roboto Flex", "Roboto", "Noto Sans TC", system-ui, sans-serif;
  --maxw: 1120px;
}

/* ---- MD3 design tokens : DARK ---- */
[data-theme="dark"] {
  --primary:             #A8C7FA;
  --on-primary:          #00315C;
  --primary-container:   #0842A0;
  --on-primary-container:#D7E3FF;
  --secondary:           #B7C8E6;
  --secondary-container: #2A3F5C;
  --on-secondary-container:#DCE9FB;
  --tertiary:            #FFB68A;
  --tertiary-container:  #6E3500;
  --on-tertiary-container:#FFDCC2;

  --background:          #111316;
  --on-background:       #E2E2E6;
  --surface:             #111316;
  --surface-container:   #1B1E22;
  --surface-container-high:#262A30;
  --surface-variant:     #43474E;
  --on-surface:          #E2E2E6;
  --on-surface-variant:  #C3C6CF;

  --outline:             #8D9199;
  --outline-variant:     #43474E;
  --error:               #FFB4AB;
  --shadow:              rgba(0,0,0,.5);

  --t1: #FF8FC4; --t1-soft: rgba(255,143,196,.14);
  --t2: #FFB77C; --t2-soft: rgba(255,183,124,.14);
  --t3: #7BDB97; --t3-soft: rgba(123,219,151,.14);
  --t4: #5BD7DF; --t4-soft: rgba(91,215,223,.14);
  --t5: #A8C7FA; --t5-soft: rgba(168,199,250,.16);
}

/* ---- per-trend accent wiring ---- */
.is-t1 { --accent: var(--t1); --accent-soft: var(--t1-soft); }
.is-t2 { --accent: var(--t2); --accent-soft: var(--t2-soft); }
.is-t3 { --accent: var(--t3); --accent-soft: var(--t3-soft); }
.is-t4 { --accent: var(--t4); --accent-soft: var(--t4-soft); }
.is-t5 { --accent: var(--t5); --accent-soft: var(--t5-soft); }

/* ---- Reset / base ---- */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  background: var(--background);
  color: var(--on-background);
  -webkit-font-smoothing: antialiased;
  transition: background .2s, color .2s;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
.material-symbols-rounded {
  font-variation-settings: "FILL" 0, "wght" 400, "GRAD" 0, "opsz" 24;
  line-height: 1;
  user-select: none;
}
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  z-index: 60;
  background: var(--primary);
  color: var(--on-primary);
  padding: 10px 16px;
  border-radius: 0 0 var(--radius-sm) 0;
  font-weight: 600;
}
.skip-link:focus { left: 0; }

/* ---- App bar ---- */
.appbar {
  position: sticky;
  top: 0;
  z-index: 30;
  background: color-mix(in srgb, var(--surface) 86%, transparent);
  backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--outline-variant);
}
.appbar__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 10px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--on-surface);
  min-width: 0;
  overflow: hidden;
}
.brand__logo {
  flex: 0 0 auto;
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border-radius: 9px;
  color: #fff;
  background: linear-gradient(135deg, var(--t5) 0%, var(--t1) 50%, var(--t2) 100%);
  box-shadow: var(--elev-1);
}
.brand__logo .material-symbols-rounded { font-size: 20px; }
.brand__name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.appbar__actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 6px;
  flex: 0 0 auto;
}
.src-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 12px;
  border-radius: var(--radius-lg);
  font-size: .82rem;
  font-weight: 600;
  color: var(--on-secondary-container);
  background: var(--secondary-container);
  transition: filter .15s, box-shadow .15s;
}
.src-link:hover { filter: brightness(.97); box-shadow: var(--elev-1); }
.src-link .material-symbols-rounded { font-size: 18px; color: var(--primary); }

/* ---- Icon button ---- */
.icon-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  border: none;
  background: transparent;
  color: var(--on-surface-variant);
  border-radius: var(--radius-lg);
  padding: 8px 10px;
  cursor: pointer;
  font: inherit;
  transition: background .15s;
}
.icon-btn:hover { background: var(--surface-container-high); }
.icon-btn__txt { font-size: .85rem; font-weight: 600; }

/* ---- Sticky section nav (scrollspy) ---- */
.sectionnav {
  position: sticky;
  top: 53px;
  z-index: 25;
  background: color-mix(in srgb, var(--background) 86%, transparent);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--outline-variant);
}
.sectionnav__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 8px 14px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}
.sectionnav__inner::-webkit-scrollbar { display: none; }
.navpill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  flex: 0 0 auto;
  padding: 7px 14px;
  border-radius: var(--radius-lg);
  font-size: .84rem;
  font-weight: 500;
  color: var(--on-surface-variant);
  border: 1px solid var(--outline-variant);
  background: transparent;
  white-space: nowrap;
  cursor: pointer;
  transition: background .15s, color .15s, border-color .15s;
}
.navpill .material-symbols-rounded { font-size: 18px; }
.navpill:hover { background: var(--surface-container-high); }
.navpill--active {
  background: var(--primary);
  color: var(--on-primary);
  border-color: transparent;
}

/* ---- Section scaffolding ---- */
.section {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 64px 20px 16px;
  scroll-margin-top: 120px;
}
.section-head { margin-bottom: 26px; max-width: 70ch; }
.section-head h2 {
  margin: 0 0 8px;
  font-size: clamp(1.5rem, 3.4vw, 2rem);
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.12;
  color: var(--on-surface);
}
.section-head__sub {
  margin: 0;
  font-size: 1rem;
  line-height: 1.55;
  color: var(--on-surface-variant);
}

/* ---- HERO ---- */
.section--hero {
  padding-top: 52px;
  position: relative;
}
.section--hero::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 420px;
  background:
    radial-gradient(60% 90% at 12% 0%, color-mix(in srgb, var(--t5) 22%, transparent), transparent 70%),
    radial-gradient(55% 80% at 88% 4%, color-mix(in srgb, var(--t1) 18%, transparent), transparent 72%);
  pointer-events: none;
  z-index: 0;
}
.section--hero > * { position: relative; z-index: 1; }
.hero__head { max-width: 30ch; margin-bottom: 30px; }
.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 18px;
  padding: 6px 14px;
  border-radius: var(--radius-lg);
  background: var(--surface-container);
  border: 1px solid var(--outline-variant);
  font-size: .82rem;
  font-weight: 600;
  color: var(--on-surface-variant);
}
.hero__dot {
  width: 9px; height: 9px; border-radius: 50%;
  background: linear-gradient(135deg, var(--t5), var(--t1));
}
.hero__title {
  margin: 0;
  font-size: clamp(2.4rem, 7vw, 4.2rem);
  font-weight: 800;
  letter-spacing: -.03em;
  line-height: 1.02;
  max-width: 14ch;
  background: linear-gradient(100deg, var(--t5) 0%, var(--t1) 48%, var(--t2) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero__lede {
  margin: 22px 0 0;
  max-width: 60ch;
  font-size: clamp(1rem, 2vw, 1.18rem);
  line-height: 1.6;
  color: var(--on-surface-variant);
}
.hero__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 14px;
}
.hero__stat {
  background: var(--surface-container);
  border-radius: var(--radius);
  padding: 22px 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  border: 1px solid var(--outline-variant);
}
.hero__stat-value {
  font-size: clamp(2rem, 4vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--primary);
  font-variant-numeric: tabular-nums;
  line-height: 1.05;
}
.hero__stat-label {
  font-size: .85rem;
  line-height: 1.4;
  color: var(--on-surface-variant);
}

/* ---- PROSE ---- */
.prose {
  max-width: 70ch;
  color: var(--on-surface-variant);
  font-size: 1.04rem;
}
.prose h3 { color: var(--on-surface); font-size: 1.2rem; font-weight: 700; margin: 28px 0 8px; }
.prose p { line-height: 1.75; margin: 0 0 16px; }
.prose ul { margin: 0 0 16px; padding-left: 22px; line-height: 1.7; }
.prose li { margin-bottom: 6px; }
.callout {
  margin: 22px 0;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  align-items: start;
  background: var(--primary-container);
  color: var(--on-primary-container);
  border-radius: var(--radius);
  padding: 20px 22px;
}
.callout__icon { color: var(--primary); font-size: 26px; }
.callout p { margin: 0; font-size: 1.08rem; line-height: 1.55; font-weight: 500; }
.callout__cite { display: block; margin-top: 10px; font-size: .85rem; font-style: normal; opacity: .85; }

/* ---- CARD grids ---- */
.grid { display: grid; gap: 18px; }
.grid--trends { grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); }
.grid--cases  { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }

.card,
.case {
  position: relative;
  background: var(--surface-container);
  border-radius: var(--radius);
  padding: 22px;
  cursor: pointer;
  border: 1px solid var(--outline-variant);
  transition: box-shadow .18s, transform .18s, border-color .18s;
  display: flex;
  flex-direction: column;
  gap: 12px;
  overflow: hidden;
}
.card--accent::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 4px;
  background: var(--accent, var(--primary));
}
.card:hover, .card:focus-visible,
.case:hover, .case:focus-visible {
  box-shadow: var(--elev-2);
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--accent, var(--primary)) 50%, var(--outline-variant));
  outline: none;
}
.card__topline { display: flex; align-items: center; justify-content: space-between; }
.card__num {
  display: grid;
  place-items: center;
  width: 38px; height: 38px;
  border-radius: 11px;
  font-weight: 800;
  font-size: 1.15rem;
  color: #fff;
  background: var(--accent, var(--primary));
  font-variant-numeric: tabular-nums;
}
.card__icon { color: var(--accent, var(--primary)); font-size: 26px; opacity: .9; }
.card__title { margin: 0; font-size: 1.18rem; font-weight: 700; color: var(--on-surface); letter-spacing: -.01em; }
.card__summary { margin: 0; font-size: .94rem; line-height: 1.55; color: var(--on-surface-variant); }
.card__stat {
  display: flex;
  align-items: baseline;
  gap: 8px;
  flex-wrap: wrap;
  background: var(--accent-soft, var(--surface-variant));
  border-radius: var(--radius-sm);
  padding: 10px 12px;
}
.card__stat b { font-size: 1.25rem; font-weight: 800; color: var(--accent, var(--primary)); }
.card__stat span { font-size: .8rem; line-height: 1.35; color: var(--on-surface-variant); }
.card__tags { margin-top: auto; display: flex; flex-wrap: wrap; gap: 6px; }
.tag {
  font-size: .72rem;
  font-weight: 500;
  color: var(--on-surface-variant);
  background: var(--surface-variant);
  padding: 3px 9px;
  border-radius: var(--radius-sm);
}
.card__more {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: .82rem;
  font-weight: 600;
  color: var(--accent, var(--primary));
}
.card__more .material-symbols-rounded { font-size: 16px; transition: transform .18s; }
.card:hover .card__more .material-symbols-rounded { transform: translateX(3px); }

/* ---- CASES ---- */
.case__head { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.case__company { font-size: 1.08rem; font-weight: 700; color: var(--on-surface); }
.case__trend {
  font-size: .7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .04em;
  color: var(--accent, var(--primary));
  background: var(--accent-soft, var(--surface-variant));
  padding: 4px 9px;
  border-radius: 999px;
  white-space: nowrap;
}
.case__metric { display: flex; flex-direction: column; gap: 3px; }
.case__metric b {
  font-size: 1.7rem;
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--accent, var(--primary));
  line-height: 1.1;
}
.case__metric span { font-size: .82rem; line-height: 1.4; color: var(--on-surface-variant); }
.case__summary { margin: 0; font-size: .9rem; line-height: 1.5; color: var(--on-surface-variant); }

/* ---- BARS (inline SVG) ---- */
.chart-card {
  margin: 0;
  background: var(--surface-container);
  border-radius: var(--radius);
  padding: 24px;
  border: 1px solid var(--outline-variant);
  max-width: 720px;
}
.chart-wrap { width: 100%; }
.chart-wrap svg { width: 100%; height: auto; display: block; }
.bar-rect { fill: var(--primary); transition: fill .15s; }
.bar-rect:hover { fill: var(--t1); }
.bar-value { fill: var(--on-surface); font-size: 14px; font-weight: 700; font-family: var(--font-body); }
.bar-label { fill: var(--on-surface-variant); font-size: 12.5px; font-family: var(--font-body); }
.axis-line { stroke: var(--outline-variant); stroke-width: 1.5; }
.chart-source { margin-top: 14px; font-size: .78rem; color: var(--on-surface-variant); line-height: 1.4; }

/* ---- ACCORDION ---- */
.accordion { display: flex; flex-direction: column; gap: 12px; max-width: 860px; }
.acc-item {
  background: var(--surface-container);
  border-radius: var(--radius);
  border: 1px solid var(--outline-variant);
  overflow: hidden;
}
.acc-q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 18px 20px;
  cursor: pointer;
  font-weight: 700;
  font-size: 1.02rem;
  color: var(--on-surface);
  list-style: none;
}
.acc-q::-webkit-details-marker { display: none; }
.acc-chevron { transition: transform .2s; color: var(--on-surface-variant); }
.acc-item[open] .acc-chevron { transform: rotate(180deg); }
.acc-item[open] { border-color: color-mix(in srgb, var(--primary) 40%, var(--outline-variant)); }
.acc-a {
  padding: 0 20px 20px;
  font-size: .96rem;
  line-height: 1.65;
  color: var(--on-surface-variant);
}

/* ---- QUOTES ---- */
.quotes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 18px;
}
.quote-card {
  margin: 0;
  position: relative;
  background: var(--surface-container);
  border-radius: var(--radius);
  padding: 26px 22px 20px;
  border: 1px solid var(--outline-variant);
  display: flex;
  flex-direction: column;
}
.quote-mark { font-size: 34px; color: var(--primary); opacity: .55; }
.quote-card blockquote {
  margin: 8px 0 16px;
  font-size: 1.02rem;
  line-height: 1.55;
  color: var(--on-surface);
  flex: 1;
}
.quote-by { display: flex; flex-direction: column; gap: 2px; }
.quote-name { font-size: .92rem; font-weight: 700; color: var(--on-surface); }
.quote-role { font-size: .8rem; color: var(--on-surface-variant); line-height: 1.35; }

/* ---- CTA ---- */
.section--cta { padding-bottom: 28px; }
.cta-card {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(80% 140% at 100% 0%, color-mix(in srgb, var(--t2) 24%, transparent), transparent 60%),
    linear-gradient(135deg, var(--primary), var(--t5));
  border-radius: var(--radius-lg);
  padding: 48px 32px;
  text-align: center;
  color: #fff;
}
.cta-eyebrow {
  margin: 0 0 12px;
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  opacity: .85;
}
.cta-card h2 { margin: 0 0 14px; font-size: clamp(1.6rem, 4vw, 2.3rem); font-weight: 800; letter-spacing: -.02em; }
.cta-card p { margin: 0 auto 18px; max-width: 60ch; line-height: 1.6; font-size: 1.05rem; opacity: .95; }
.cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #fff;
  color: #0B1F3A;
  padding: 13px 26px;
  border-radius: var(--radius-lg);
  font-weight: 700;
  box-shadow: var(--elev-2);
  transition: box-shadow .15s, transform .15s;
}
.cta-btn:hover { box-shadow: var(--elev-3); transform: translateY(-2px); }
.cta-note {
  margin: 26px auto 0 !important;
  max-width: 64ch;
  font-size: .9rem !important;
  line-height: 1.6;
  opacity: .9;
  font-style: italic;
  border-top: 1px solid rgba(255,255,255,.25);
  padding-top: 18px;
}

/* ---- Dialog ---- */
.dialog {
  border: none;
  border-radius: var(--radius-lg);
  background: var(--surface-container-high);
  color: var(--on-surface);
  max-width: 640px;
  width: calc(100% - 32px);
  max-height: calc(100vh - 64px);
  padding: 0;
  box-shadow: var(--elev-3);
  overflow: hidden;
}
.dialog::backdrop { background: rgba(8,16,32,.55); backdrop-filter: blur(2px); }
.dialog__bar {
  display: flex;
  align-items: center;
  padding: 8px 12px;
  position: sticky;
  top: 0;
  background: var(--surface-container-high);
  z-index: 2;
}
.dialog__spacer { flex: 1; }
.dialog__body {
  padding: 8px 28px 30px;
  overflow-y: auto;
  max-height: calc(100vh - 120px);
}
.dialog__kicker {
  margin: 0 0 6px;
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--primary);
}
.dialog__body h2 { margin: 0 0 14px; font-size: 1.5rem; font-weight: 800; letter-spacing: -.02em; color: var(--on-surface); }
.dialog__body .card__tags { margin: 0 0 16px; }
.dialog__stat {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
  background: var(--surface-container);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  margin: 0 0 18px;
}
.dialog__stat b { font-size: 1.7rem; font-weight: 800; color: var(--primary); letter-spacing: -.02em; }
.dialog__stat span { font-size: .88rem; line-height: 1.4; color: var(--on-surface-variant); }
.dialog__detail { color: var(--on-surface-variant); }
.dialog__detail h3 { color: var(--on-surface); font-size: 1.08rem; font-weight: 700; margin: 22px 0 8px; }
.dialog__detail p { line-height: 1.7; margin: 0 0 14px; }
.dialog__detail ul { margin: 0 0 14px; padding-left: 22px; line-height: 1.65; }
.dialog__detail li { margin-bottom: 6px; }

/* ---- Footer ---- */
.footer {
  max-width: var(--maxw);
  margin: 40px auto 0;
  padding: 30px 20px 44px;
  color: var(--on-surface-variant);
  font-size: .84rem;
  line-height: 1.6;
  border-top: 1px solid var(--outline-variant);
}
.footer__main { margin: 0 0 6px; font-weight: 600; color: var(--on-surface); }
.footer__sub { margin: 0; opacity: .85; }

/* ---- Responsive ---- */
@media (max-width: 600px) {
  .grid--trends, .grid--cases, .quotes-grid { grid-template-columns: 1fr; }
  .icon-btn__txt { font-size: .8rem; }
  .src-link__txt { display: none; }
  .section { padding-top: 48px; }
  .hero__title { max-width: 100%; }
}
@media (max-width: 380px) {
  .appbar__inner, .sectionnav__inner, .section { padding-left: 14px; padding-right: 14px; }
  .hero__stats { grid-template-columns: 1fr; }
}

/* Respect reduced-motion */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}