/* ================================
   稅務小助手 — 全站樣式
   原創設計 / 綠色主題 / 響應式
   ================================ */

:root {
  --green-900: #1b5e20;
  --green-700: #2e7d32;
  --green-500: #43a047;
  --green-300: #81c784;
  --green-50:  #e8f5e9;
  --gold:      #ffc107;
  --ink-900:   #0f1a14;
  --ink-700:   #2b3a30;
  --ink-500:   #51635a;
  --ink-300:   #9aa9a1;
  --ink-100:   #e6ebe7;
  --bg:        #fafdfb;
  --white:     #ffffff;
  --shadow-sm: 0 2px 8px rgba(27,94,32,.06);
  --shadow:    0 6px 24px rgba(27,94,32,.08);
  --radius:    12px;
  --maxw:      1140px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink-700);
  font-family: -apple-system, BlinkMacSystemFont, "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--green-700); text-decoration: none; transition: color .15s; }
a:hover { color: var(--green-900); }
h1, h2, h3, h4 { color: var(--ink-900); font-weight: 700; line-height: 1.3; margin: 0 0 .6em; }
h1 { font-size: 2.2rem; }
h2 { font-size: 1.6rem; }
h3 { font-size: 1.2rem; }
p { margin: 0 0 1em; }
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* ============ Header ============ */
.site-header {
  background: var(--white);
  border-bottom: 1px solid var(--ink-100);
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: var(--shadow-sm);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  font-size: 1.25rem; font-weight: 800; color: var(--green-900);
}
.brand-logo {
  width: 38px; height: 38px;
  background: linear-gradient(135deg, var(--green-500), var(--green-900));
  border-radius: 10px;
  display: grid; place-items: center;
  color: #fff; font-weight: 900;
  font-family: "Noto Serif TC", serif;
}
.nav { display: flex; gap: 28px; }
.nav a {
  color: var(--ink-700); font-weight: 500;
  padding: 8px 0; position: relative;
}
.nav a:hover, .nav a.active { color: var(--green-700); }
.nav a.active::after {
  content: ''; position: absolute; left: 0; right: 0; bottom: -2px;
  height: 2px; background: var(--green-500); border-radius: 2px;
}
.nav-toggle {
  display: none; background: none; border: 0;
  width: 40px; height: 40px; cursor: pointer;
  align-items: center; justify-content: center;
}
.nav-toggle span {
  display: block; width: 22px; height: 2px; background: var(--ink-700); position: relative;
}
.nav-toggle span::before, .nav-toggle span::after {
  content: ''; position: absolute; left: 0; width: 22px; height: 2px; background: var(--ink-700);
}
.nav-toggle span::before { top: -7px; }
.nav-toggle span::after  { top: 7px; }

@media (max-width: 768px) {
  .nav-toggle { display: flex; }
  .nav {
    position: absolute; top: 72px; left: 0; right: 0;
    background: #fff; flex-direction: column; gap: 0;
    padding: 12px 20px; border-bottom: 1px solid var(--ink-100);
    display: none;
  }
  .nav.open { display: flex; }
  .nav a { padding: 12px 0; border-bottom: 1px solid var(--ink-100); }
  .nav a:last-child { border-bottom: 0; }
}

/* ============ Hero ============ */
.hero {
  background: linear-gradient(135deg, var(--green-50) 0%, #fff 60%);
  padding: 80px 0 60px;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; right: -120px; top: -80px;
  width: 420px; height: 420px;
  background: radial-gradient(circle, rgba(67,160,71,.15) 0%, transparent 70%);
  border-radius: 50%;
}
.hero-grid {
  display: grid; grid-template-columns: 1.2fr 1fr; gap: 40px; align-items: center;
  position: relative; z-index: 1;
}
.hero-tag {
  display: inline-block;
  background: var(--green-50); color: var(--green-700);
  padding: 6px 14px; border-radius: 999px;
  font-size: .85rem; font-weight: 600;
  margin-bottom: 16px;
}
.hero h1 {
  font-size: 2.6rem;
  background: linear-gradient(135deg, var(--green-900), var(--green-500));
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
  margin-bottom: .6em;
}
.hero-sub { font-size: 1.1rem; color: var(--ink-500); margin-bottom: 30px; }
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; }
.btn {
  display: inline-block;
  padding: 13px 28px; border-radius: 999px;
  font-weight: 600; cursor: pointer; border: 0;
  transition: transform .15s, box-shadow .15s;
}
.btn-primary {
  background: var(--green-700); color: #fff;
  box-shadow: 0 4px 16px rgba(46,125,50,.25);
}
.btn-primary:hover { background: var(--green-900); color: #fff; transform: translateY(-2px); }
.btn-outline {
  background: #fff; color: var(--green-700);
  border: 1.5px solid var(--green-300);
}
.btn-outline:hover { background: var(--green-50); transform: translateY(-2px); }

.hero-illu {
  aspect-ratio: 1/1;
  background-image: url('../img/hero-illu.jpg');
  background-size: cover;
  background-position: center;
  border-radius: 24px;
  display: grid; place-items: end stretch;
  box-shadow: 0 24px 48px rgba(27,94,32,.18);
  position: relative; overflow: hidden;
}
.hero-illu::before {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(27,94,32,0) 30%, rgba(27,94,32,.85) 100%);
}
.hero-illu-text {
  color: #fff; padding: 28px;
  position: relative; z-index: 1;
}
.hero-illu-text .big {
  font-size: 1.3rem; font-weight: 800; font-family: "Noto Sans TC", sans-serif;
  margin-bottom: 6px;
}
.hero-illu-text .sub { opacity: .9; font-size: .85rem; letter-spacing: 1px; }

@media (max-width: 768px) {
  .hero { padding: 50px 0 40px; }
  .hero-grid { grid-template-columns: 1fr; gap: 30px; }
  .hero h1 { font-size: 1.9rem; }
  .hero-illu { max-width: 320px; margin: 0 auto; }
}

/* ============ Section base ============ */
section { padding: 70px 0; }
.section-head { text-align: center; margin-bottom: 50px; }
.section-head h2 {
  font-size: 2rem; display: inline-block; position: relative;
}
.section-head h2::after {
  content: ''; display: block;
  width: 60px; height: 3px; background: var(--green-500);
  margin: 14px auto 0; border-radius: 2px;
}
.section-head p { color: var(--ink-500); }

/* ============ Services grid ============ */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}
.service-card {
  background: #fff; padding: 32px 24px;
  border-radius: var(--radius);
  border: 1px solid var(--ink-100);
  box-shadow: var(--shadow-sm);
  transition: transform .25s, box-shadow .25s;
  text-align: center;
}
.service-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
}
.service-icon {
  width: 64px; height: 64px;
  background: var(--green-50); color: var(--green-700);
  border-radius: 16px;
  display: grid; place-items: center; margin: 0 auto 18px;
}
.service-icon svg { width: 32px; height: 32px; }
.service-card h3 { margin-bottom: 10px; }
.service-card p { color: var(--ink-500); font-size: .95rem; margin: 0; }

/* ============ Article cards ============ */
.bg-soft { background: var(--green-50); }
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
  gap: 26px;
}
.article-card {
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--ink-100);
  box-shadow: var(--shadow-sm);
  transition: transform .25s, box-shadow .25s;
  display: flex; flex-direction: column;
}
.article-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}
.article-cover {
  aspect-ratio: 16/9;
  background-color: var(--green-700);
  background-size: cover;
  background-position: center;
  position: relative; overflow: hidden;
  display: block;
}
.article-cover::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(46,125,50,.05) 0%, rgba(27,94,32,.35) 100%);
  transition: background .25s;
}
.article-card:hover .article-cover::after {
  background: linear-gradient(135deg, rgba(46,125,50,0) 0%, rgba(27,94,32,.15) 100%);
}
/* 舊 cover-N class 留作 fallback,以防 inline bg image 失敗 */
.cover-1, .cover-6 { background-color: #2e7d32; }
.cover-2 { background-color: #43a047; }
.cover-3 { background-color: #1b5e20; }
.cover-4 { background-color: #ffc107; }
.cover-5 { background-color: #00897b; }
.article-body { padding: 22px 22px 24px; flex: 1; display: flex; flex-direction: column; }
.article-cat {
  display: inline-block; font-size: .75rem; font-weight: 700;
  color: var(--green-700); background: var(--green-50);
  padding: 3px 10px; border-radius: 4px; margin-bottom: 10px;
  align-self: flex-start; letter-spacing: .5px;
}
.article-card h3 {
  font-size: 1.1rem; margin-bottom: 10px; line-height: 1.45;
}
.article-card h3 a { color: var(--ink-900); }
.article-card h3 a:hover { color: var(--green-700); }
.article-excerpt {
  color: var(--ink-500); font-size: .92rem;
  margin-bottom: 16px; flex: 1;
}
.article-meta {
  display: flex; justify-content: space-between; align-items: center;
  font-size: .8rem; color: var(--ink-300);
  border-top: 1px solid var(--ink-100); padding-top: 14px;
}

/* ============ CTA banner ============ */
.cta-banner {
  background: linear-gradient(135deg, var(--green-900), var(--green-500));
  color: #fff; border-radius: 20px;
  padding: 50px 40px;
  text-align: center;
  box-shadow: 0 12px 36px rgba(27,94,32,.2);
}
.cta-banner h2 { color: #fff; }
.cta-banner p { color: rgba(255,255,255,.88); margin-bottom: 26px; }
.cta-banner .btn-primary {
  background: #fff; color: var(--green-700);
  box-shadow: 0 4px 16px rgba(0,0,0,.15);
}
.cta-banner .btn-primary:hover { background: var(--green-50); }

/* ============ Footer ============ */
.site-footer {
  background: var(--ink-900);
  color: rgba(255,255,255,.7);
  padding: 60px 0 30px;
  margin-top: 80px;
}
.site-footer h4 { color: #fff; font-size: 1rem; margin-bottom: 18px; }
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.site-footer a {
  color: rgba(255,255,255,.7); display: block; padding: 4px 0;
  font-size: .92rem;
}
.site-footer a:hover { color: #fff; }
.footer-brand-text {
  font-size: .92rem; margin-top: 14px;
  color: rgba(255,255,255,.6);
}
.footer-brand .brand { color: #fff; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.1);
  padding-top: 24px;
  text-align: center;
  font-size: .85rem;
  color: rgba(255,255,255,.5);
}

@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 30px; }
}

/* ============ Article page ============ */
.article-hero {
  background: linear-gradient(135deg, var(--green-50), #fff);
  padding: 60px 0 40px;
}
.breadcrumb {
  font-size: .85rem; color: var(--ink-500); margin-bottom: 14px;
}
.breadcrumb a { color: var(--ink-500); }
.breadcrumb a:hover { color: var(--green-700); }
.article-title { font-size: 2.2rem; max-width: 800px; }
.article-info {
  display: flex; gap: 20px; margin-top: 20px;
  font-size: .9rem; color: var(--ink-500);
}
.article-info .dot { color: var(--ink-300); }
.article-cover-big {
  max-width: 880px; margin: -20px auto 0;
  aspect-ratio: 16/7;
  border-radius: 16px;
  overflow: hidden;
  background-color: var(--green-700);
  background-size: cover;
  background-position: center;
  position: relative;
  box-shadow: 0 12px 36px rgba(27,94,32,.15);
}
.article-cover-big::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(46,125,50,.05) 0%, rgba(27,94,32,.4) 100%);
}
.article-cover-big .big-text { display: none; }
.article-content {
  max-width: 780px; margin: 60px auto;
  font-size: 1.05rem; line-height: 1.85;
}
.article-content h2 {
  font-size: 1.6rem; margin-top: 2.2em; margin-bottom: .8em;
  padding-left: 14px; border-left: 4px solid var(--green-500);
}
.article-content h3 { font-size: 1.2rem; margin-top: 1.8em; color: var(--green-900); }
.article-content p { margin-bottom: 1.2em; }
.article-content ul, .article-content ol {
  margin: 0 0 1.4em; padding-left: 24px;
}
.article-content li { margin-bottom: .5em; }
.article-content blockquote {
  margin: 1.6em 0; padding: 18px 24px;
  background: var(--green-50);
  border-left: 4px solid var(--green-500);
  border-radius: 0 8px 8px 0;
  color: var(--ink-700);
  font-style: italic;
}
.article-content code {
  background: var(--ink-100); padding: 2px 6px; border-radius: 4px;
  font-family: ui-monospace, monospace; font-size: .92em;
}
.article-content strong { color: var(--ink-900); }
.article-content table {
  width: 100%; border-collapse: collapse; margin: 1.4em 0;
  font-size: .95em;
}
.article-content th {
  background: var(--green-700); color: #fff;
  padding: 10px 14px; text-align: left;
}
.article-content td {
  padding: 10px 14px; border-bottom: 1px solid var(--ink-100);
}
.article-content tr:nth-child(even) td { background: var(--green-50); }

.share-bar {
  max-width: 780px; margin: 30px auto;
  display: flex; gap: 12px; align-items: center;
  font-size: .9rem; color: var(--ink-500);
  padding: 18px 0; border-top: 1px solid var(--ink-100); border-bottom: 1px solid var(--ink-100);
}
.share-bar .share-btns { display: flex; gap: 10px; margin-left: auto; }
.share-btn {
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--green-50); color: var(--green-700);
  display: grid; place-items: center;
  cursor: pointer; border: 0;
}
.share-btn:hover { background: var(--green-500); color: #fff; }

.related-section {
  max-width: 1100px; margin: 40px auto;
}
.related-section h2 {
  font-size: 1.5rem; padding-left: 14px;
  border-left: 4px solid var(--green-500);
  margin-bottom: 26px;
}

/* ============ Category filter (articles page) ============ */
.cat-filter {
  display: flex; gap: 10px; flex-wrap: wrap;
  justify-content: center; margin-bottom: 36px;
}
.cat-btn {
  padding: 8px 18px; border-radius: 999px;
  background: #fff; border: 1.5px solid var(--ink-100);
  color: var(--ink-700);
  font-size: .9rem; cursor: pointer;
  transition: all .15s;
}
.cat-btn:hover, .cat-btn.active {
  background: var(--green-700); border-color: var(--green-700); color: #fff;
}

/* ============ Page hero (about/contact) ============ */
.page-hero {
  background: linear-gradient(135deg, var(--green-50), #fff);
  padding: 70px 0 50px;
  text-align: center;
}
.page-hero h1 {
  font-size: 2.4rem;
  background: linear-gradient(135deg, var(--green-900), var(--green-500));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.page-hero p { color: var(--ink-500); font-size: 1.1rem; max-width: 600px; margin: 0 auto; }

.about-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 50px;
  max-width: 1000px; margin: 0 auto;
  align-items: center;
}
.about-illu {
  aspect-ratio: 1/1;
  background-image: url('../img/about-illu.jpg');
  background-size: cover;
  background-position: center;
  border-radius: 20px;
  position: relative; overflow: hidden;
  box-shadow: var(--shadow);
}
.about-illu::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(46,125,50,.05), rgba(27,94,32,.25));
}
.about-stats {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 24px; margin: 40px 0;
}
.stat-card {
  background: #fff; padding: 24px;
  border-radius: var(--radius);
  border: 1px solid var(--ink-100);
  text-align: center;
}
.stat-num {
  font-size: 2.2rem; font-weight: 800; color: var(--green-700);
  font-family: "Noto Serif TC", serif;
}
.stat-label { font-size: .9rem; color: var(--ink-500); }

@media (max-width: 768px) {
  .about-grid { grid-template-columns: 1fr; gap: 30px; }
  .about-stats { grid-template-columns: 1fr; }
}

.contact-grid {
  display: grid; grid-template-columns: 1.2fr 1fr; gap: 50px;
  max-width: 1000px; margin: 0 auto;
}
.contact-form {
  background: #fff; padding: 32px;
  border-radius: var(--radius);
  border: 1px solid var(--ink-100);
  box-shadow: var(--shadow-sm);
}
.form-group { margin-bottom: 18px; }
.form-group label {
  display: block; font-weight: 600; margin-bottom: 8px;
  font-size: .9rem; color: var(--ink-700);
}
.form-group input, .form-group textarea, .form-group select {
  width: 100%; padding: 11px 14px;
  border: 1.5px solid var(--ink-100);
  border-radius: 8px;
  font-family: inherit; font-size: 1rem;
  transition: border-color .15s;
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
  outline: 0; border-color: var(--green-500);
}
.form-group textarea { min-height: 120px; resize: vertical; }
.contact-info ul { list-style: none; padding: 0; }
.contact-info li {
  display: flex; gap: 14px; margin-bottom: 22px;
  align-items: flex-start;
}
.contact-info .icon {
  flex-shrink: 0;
  width: 42px; height: 42px;
  background: var(--green-50); color: var(--green-700);
  border-radius: 10px;
  display: grid; place-items: center;
}
.contact-info strong { display: block; color: var(--ink-900); margin-bottom: 2px; }
.contact-info span { color: var(--ink-500); font-size: .92rem; }

@media (max-width: 768px) {
  .contact-grid { grid-template-columns: 1fr; }
}

/* ============ Newsletter inline ============ */
.newsletter {
  background: #fff; padding: 30px;
  border-radius: var(--radius);
  border: 1px solid var(--ink-100);
  text-align: center;
  margin: 40px auto; max-width: 600px;
}
.newsletter h3 { color: var(--green-900); }
.newsletter-form {
  display: flex; gap: 10px; margin-top: 18px;
}
.newsletter-form input {
  flex: 1; padding: 12px 16px;
  border: 1.5px solid var(--ink-100);
  border-radius: 999px;
  font-family: inherit; font-size: 1rem;
}
.newsletter-form input:focus { outline: 0; border-color: var(--green-500); }
.newsletter-form button {
  padding: 12px 26px; border-radius: 999px;
  background: var(--green-700); color: #fff; border: 0;
  font-weight: 600; cursor: pointer;
}

@media (max-width: 480px) {
  .newsletter-form { flex-direction: column; }
}