/* ============================================================
   Be The Change Taiwan — shared stylesheet
   Palette: warm terracotta + ivory, photographic, grounded
   ============================================================ */

:root {
  /* Brand earth tones (from brand guide — 大地棕 / Terracotta) */
  --brand:        #A0552B;   /* primary terracotta — used in logo wordmark */
  --brand-deep:   #7C3F1E;   /* darker accent */
  --brand-soft:   #C77A4D;   /* lighter accent */
  --brand-tint:   #EDD9C6;   /* very light wash */

  /* Neutrals */
  --ink:          #2A1F18;
  --ink-soft:     #5A4A3F;
  --ink-mute:     #8A7A6F;
  --line:         #E6DBCF;
  --paper:        #FBF7F1;   /* warm ivory */
  --paper-2:      #F4EBDF;   /* secondary cream */
  --white:        #FFFFFF;

  /* Type scale (px / rem) */
  --f-hero:    clamp(40px, 5.5vw, 72px);
  --f-h1:      clamp(32px, 4vw, 52px);
  --f-h2:      clamp(24px, 2.6vw, 34px);
  --f-h3:      18px;
  --f-body:    16px;
  --f-small:   14px;

  --maxw: 1240px;
  --gut: clamp(20px, 4vw, 56px);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Noto Sans TC", "Noto Sans CJK TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.7;
  font-size: var(--f-body);
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { display: block; max-width: 100%; }

a { color: var(--brand); text-decoration: none; }
a:hover { color: var(--brand-deep); }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gut); }

/* ───────────── Top bar ───────────── */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: rgba(251, 247, 241, 0.92);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.topbar-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 76px;
  max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gut);
}
.brand-mark {
  display: inline-flex; align-items: center;
  color: var(--brand);
}
.brand-mark img.logo {
  height: 50px; width: auto; display: block;
}
@media (max-width: 640px){
  .brand-mark img.logo { height: 40px; }
}

nav.primary {
  display: flex; gap: clamp(8px, 2vw, 32px); align-items: center;
  font-size: 15px;
}
nav.primary a {
  color: var(--ink-soft);
  padding: 8px 4px;
  position: relative;
  font-weight: 500;
  transition: color .2s ease;
}
nav.primary a:hover { color: var(--brand); }
nav.primary a.active { color: var(--brand); }
nav.primary a.active::after {
  content: ""; position: absolute; left: 4px; right: 4px; bottom: 0;
  height: 2px; background: var(--brand);
}
nav.primary .nav-cta {
  margin-left: 12px;
  background: var(--brand); color: var(--white);
  padding: 10px 22px; border-radius: 999px;
  font-weight: 600;
  transition: background .2s ease;
}
nav.primary .nav-cta:hover { background: var(--brand-deep); color: var(--white); }

/* ───────────── Buttons ───────────── */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 28px; border-radius: 999px;
  font-weight: 600; font-size: 15px;
  border: none; cursor: pointer;
  transition: all .2s ease;
  font-family: inherit;
}
.btn-primary { background: var(--brand); color: var(--white); }
.btn-primary:hover { background: var(--brand-deep); color: var(--white); }
.btn-ghost {
  background: transparent; color: var(--white);
  border: 1.5px solid rgba(255,255,255,0.7);
}
.btn-ghost:hover { background: rgba(255,255,255,0.15); color: var(--white); }
.btn-outline {
  background: transparent; color: var(--brand);
  border: 1.5px solid var(--brand);
}
.btn-outline:hover { background: var(--brand); color: var(--white); }

/* ───────────── Section header helpers ───────────── */
.eyebrow {
  display: inline-flex; align-items: center; gap: 12px;
  font-size: 13px; letter-spacing: 0.22em;
  color: var(--brand);
  font-weight: 600; text-transform: uppercase;
}
.eyebrow::before {
  content: ""; display: block; width: 32px; height: 1px; background: var(--brand);
}
.section-title-cn {
  font-family: "Noto Serif TC", "Noto Serif CJK TC", serif;
  font-size: var(--f-h1);
  font-weight: 700;
  color: var(--ink);
  letter-spacing: 0.04em;
  line-height: 1.25;
  margin: 12px 0 8px;
}
.section-title-en {
  font-size: 14px; letter-spacing: 0.32em;
  color: var(--ink-mute);
  font-weight: 500;
  text-transform: uppercase;
}
.section-lead {
  font-size: 17px;
  color: var(--ink-soft);
  max-width: 760px;
  margin: 24px auto 0;
  line-height: 1.85;
}

/* ───────────── Page hero (used by inner pages) ───────────── */
.page-hero {
  position: relative;
  min-height: 460px;
  display: flex; align-items: flex-end;
  color: var(--white);
  overflow: hidden;
}
.page-hero .bg {
  position: absolute; inset: 0;
  background-size: cover; background-position: center;
}
.page-hero .scrim {
  position: absolute; inset: 0;
  background:
    linear-gradient(180deg, rgba(42,31,24,0.15) 0%, rgba(42,31,24,0.55) 60%, rgba(42,31,24,0.78) 100%);
}
.page-hero .scrim-warm {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(160,85,43,0.20) 0%, rgba(124,63,30,0.6) 100%);
  mix-blend-mode: multiply;
}
.page-hero .inner {
  position: relative; z-index: 2;
  max-width: var(--maxw); margin: 0 auto; padding: 80px var(--gut) 64px;
  width: 100%;
}
.page-hero .breadcrumbs {
  font-size: 13px; letter-spacing: 0.18em; opacity: 0.85;
  text-transform: uppercase;
  margin-bottom: 18px;
}
.page-hero .breadcrumbs a { color: inherit; opacity: 0.7; }
.page-hero .breadcrumbs a:hover { opacity: 1; color: inherit; }
.page-hero h1 {
  font-family: "Noto Serif TC", "Noto Serif CJK TC", serif;
  font-size: var(--f-hero);
  font-weight: 700;
  margin: 0 0 12px;
  letter-spacing: 0.03em;
  line-height: 1.15;
  max-width: 16ch;
}
.page-hero .hero-en {
  font-size: 14px; letter-spacing: 0.34em;
  text-transform: uppercase;
  opacity: 0.85; font-weight: 500;
}
.page-hero .hero-lead {
  margin-top: 22px; max-width: 620px;
  font-size: 17px; line-height: 1.85;
  opacity: 0.92;
}

/* ───────────── Footer ───────────── */
footer.site-footer {
  background: #2A1F18;
  color: rgba(255,255,255,0.78);
  padding: 64px 0 28px;
  margin-top: 80px;
}
footer.site-footer .grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 48px;
}
@media (max-width: 880px) {
  footer.site-footer .grid { grid-template-columns: 1fr 1fr; }
}
footer.site-footer h4 {
  font-size: 13px; letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--brand-soft);
  margin: 0 0 18px;
  font-weight: 600;
}
footer.site-footer a { color: rgba(255,255,255,0.78); display: block; padding: 4px 0; font-size: 14px; }
footer.site-footer a:hover { color: var(--white); }
footer.site-footer .footer-brand img.logo-footer {
  height: 52px; width: auto;
  /* Logo is brown — keep it visible on dark footer by tinting it warm */
  filter: brightness(0) saturate(100%) invert(58%) sepia(36%) saturate(589%) hue-rotate(346deg) brightness(91%) contrast(85%);
  margin-bottom: 20px; display: block;
}
footer.site-footer .footer-brand p {
  font-size: 14px; line-height: 1.8; max-width: 32ch;
  color: rgba(255,255,255,0.6);
}
footer.site-footer .bar {
  margin-top: 56px; padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.12);
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px;
  font-size: 12px; color: rgba(255,255,255,0.5); letter-spacing: 0.05em;
}

/* ───────────── Mobile nav (hamburger) ───────────── */
.nav-toggle {
  display: none;
  flex-direction: column; justify-content: center; gap: 5px;
  background: none; border: none; cursor: pointer;
  padding: 8px; color: var(--ink);
}
.nav-toggle span {
  display: block; width: 22px; height: 2px;
  background: currentColor;
  transition: transform .25s ease, opacity .25s ease;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 720px) {
  .nav-toggle { display: flex; }
  nav.primary {
    display: none;
    position: fixed; inset: 76px 0 0 0;
    background: var(--paper);
    flex-direction: column;
    align-items: center; justify-content: center;
    gap: 28px;
    z-index: 40;
    font-size: 18px;
    border-top: 1px solid var(--line);
  }
  nav.primary.open { display: flex; }
  nav.primary .nav-cta { margin-left: 0; }
}

/* ───────────── Footer responsive ───────────── */
@media (max-width: 480px) {
  footer.site-footer .grid { grid-template-columns: 1fr; gap: 32px; }
  footer.site-footer .bar { flex-direction: column; text-align: center; gap: 8px; }
}

/* ───────────── Utility ───────────── */
.divider {
  width: 48px; height: 2px; background: var(--brand);
  margin: 20px 0;
}
.divider.center { margin-left: auto; margin-right: auto; }
.center { text-align: center; }

/* Logo block component */
.logo-svg .leaf { fill: var(--brand); }