/* ===== CSS Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.7; color: #1e293b; background: #f8fafc; min-height: 100vh; display: flex; flex-direction: column;
  -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
}
img { max-width: 100%; height: auto; }
a { color: #2563eb; text-decoration: none; transition: color .2s; }
a:hover { color: #1d4ed8; text-decoration: underline; }

/* ===== Variables ===== */
:root {
  --primary: #2563eb; --primary-dark: #1d4ed8; --primary-light: #dbeafe;
  --secondary: #059669; --accent: #f59e0b;
  --bg: #f8fafc; --bg-card: #ffffff; --bg-footer: #0f172a;
  --text: #1e293b; --text-muted: #64748b; --text-light: #94a3b8;
  --border: #e2e8f0; --radius: 16px; --radius-sm: 10px;
  --shadow: 0 1px 2px rgba(0,0,0,.06), 0 1px 3px rgba(0,0,0,.1);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,.08), 0 2px 4px -2px rgba(0,0,0,.06);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,.08), 0 4px 6px -4px rgba(0,0,0,.04);
  --max-width: 1200px; --header-height: 68px;
}

/* ===== Skip Link ===== */
.skip-link { position: absolute; top: -100px; left: 50%; transform: translateX(-50%); background: var(--primary); color: #fff; padding: 10px 20px; z-index: 10000; border-radius: 0 0 12px 12px; font-weight: 600; font-size: .9rem; }
.skip-link:focus { top: 0; outline-offset: 2px; }

/* ===== Header ===== */
.site-header {
  position: sticky; top: 0; z-index: 1000; background: rgba(255,255,255,.92); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border); height: var(--header-height);
}
.header-inner {
  max-width: var(--max-width); margin: 0 auto; padding: 0 28px; height: 100%;
  display: flex; align-items: center; justify-content: space-between;
}
.site-logo { font-size: 1.3rem; font-weight: 800; color: var(--primary); display: flex; align-items: center; gap: 8px; letter-spacing: -.3px; }
.site-logo:hover { text-decoration: none; color: var(--primary-dark); }
.site-logo .logo-icon { font-size: 1.5rem; }
.main-nav { display: flex; align-items: center; gap: 2px; }
.main-nav a {
  padding: 8px 16px; border-radius: 10px; font-size: .88rem; font-weight: 500;
  color: var(--text-muted); transition: all .2s;
}
.main-nav a:hover, .main-nav a.active { background: var(--primary-light); color: var(--primary); text-decoration: none; }
.nav-toggle { display: none; background: none; border: none; font-size: 1.5rem; cursor: pointer; color: var(--text); padding: 6px; border-radius: 8px; }
.nav-toggle:hover { background: var(--border); }

/* ===== Footer ===== */
.site-footer {
  background: var(--bg-footer); color: #94a3b8; padding: 56px 28px 28px; margin-top: auto;
}
.footer-inner { max-width: var(--max-width); margin: 0 auto; }
.footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 40px; margin-bottom: 36px; }
.footer-col h4 { color: #f1f5f9; font-size: .95rem; font-weight: 700; margin-bottom: 14px; letter-spacing: -.2px; }
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 8px; }
.footer-col a { color: #64748b; font-size: .88rem; transition: color .2s; }
.footer-col a:hover { color: #e2e8f0; text-decoration: none; }
.footer-bottom { border-top: 1px solid #1e293b; padding-top: 24px; text-align: center; font-size: .85rem; color: #475569; }

/* ===== Main Content ===== */
.main-content { flex: 1; padding: 48px 20px; }
.main-content.wide { max-width: var(--max-width); margin: 0 auto; width: 100%; padding-left: 32px; padding-right: 32px; }

/* ===== Hero ===== */
.hero { text-align: center; padding: 48px 20px 32px; }
.hero h1 { font-size: 2.6rem; font-weight: 800; color: #0f172a; margin-bottom: 14px; letter-spacing: -.5px; line-height: 1.2; }
.hero h1 span { background: linear-gradient(135deg, #2563eb, #059669); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.hero p { font-size: 1.1rem; color: var(--text-muted); max-width: 600px; margin: 0 auto 20px; line-height: 1.7; }
.hero .subtitle { font-size: .9rem; color: var(--text-light); display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }
.hero .subtitle span { display: inline-flex; align-items: center; gap: 4px; }

/* ===== Cards Grid ===== */
.cards-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; }
.card {
  background: var(--bg-card); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow);
  border: 1px solid var(--border); transition: all .25s; display: flex; flex-direction: column;
  position: relative; overflow: hidden;
}
.card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--secondary)); opacity: 0; transition: opacity .25s;
}
.card:hover::before { opacity: 1; }
.card:hover { box-shadow: var(--shadow-lg); transform: translateY(-3px); border-color: transparent; }
.card-icon { font-size: 2rem; margin-bottom: 14px; }
.card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; color: #0f172a; letter-spacing: -.2px; }
.card p { font-size: .88rem; color: var(--text-muted); flex: 1; margin-bottom: 14px; line-height: 1.6; }
.card .card-link { color: var(--primary); font-weight: 600; font-size: .88rem; display: inline-flex; align-items: center; gap: 6px; }
.card .card-link::after { content: '→'; transition: transform .2s; }
.card:hover .card-link::after { transform: translateX(4px); }

/* ===== Category Section ===== */
.category-section { margin-bottom: 48px; }
.category-section > p { color: var(--text-muted); margin-bottom: 20px; font-size: .95rem; line-height: 1.7; }
.category-section h2 {
  font-size: 1.5rem; font-weight: 700; margin-bottom: 16px; padding-bottom: 12px;
  border-bottom: 3px solid var(--primary-light); display: flex; align-items: center; gap: 10px;
  letter-spacing: -.3px;
}
.category-section .section-link { text-align: right; margin-top: -44px; margin-bottom: 16px; }

/* ===== Calculator Page ===== */
.calc-page { max-width: 800px; margin: 0 auto; }
.calc-container {
  background: var(--bg-card); border-radius: var(--radius); padding: 36px; box-shadow: var(--shadow);
  border: 1px solid var(--border); margin-bottom: 32px;
}
.calc-container h1 { font-size: 1.7rem; font-weight: 800; margin-bottom: 6px; letter-spacing: -.3px; }
.calc-container .calc-desc { color: var(--text-muted); margin-bottom: 28px; font-size: .95rem; }
.calc-container .calc-form-area { }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-weight: 600; font-size: .88rem; margin-bottom: 6px; color: var(--text); }
.form-group input, .form-group select {
  width: 100%; padding: 12px 16px; border: 1.5px solid var(--border); border-radius: var(--radius-sm);
  font-size: 1rem; transition: border-color .2s; background: #fff; color: var(--text);
}
.form-group input:focus, .form-group select:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 4px var(--primary-light); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.btn { display: inline-flex; align-items: center; gap: 6px; padding: 12px 28px; border-radius: var(--radius-sm); font-size: .95rem; font-weight: 600; border: none; cursor: pointer; transition: all .2s; }
.btn:active { transform: scale(.97); }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-secondary { background: #f1f5f9; color: var(--text); }
.btn-secondary:hover { background: #e2e8f0; }
.btn-group { display: flex; gap: 12px; margin-top: 24px; flex-wrap: wrap; }
.calc-result {
  margin-top: 28px; padding: 24px; background: #f0fdf4; border: 1px solid #bbf7d0;
  border-radius: var(--radius); display: none;
}
.calc-result.show { display: block; animation: fadeUp .3s ease; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }
.calc-result .result-value { font-size: 2rem; font-weight: 800; color: var(--secondary); letter-spacing: -.3px; }
.calc-result .result-label { font-size: .85rem; color: var(--text-light); text-transform: uppercase; letter-spacing: .5px; font-weight: 600; margin-bottom: 2px; }
.calc-result .result-detail { margin-top: 16px; padding-top: 16px; border-top: 1px solid #bbf7d0; font-size: .9rem; color: var(--text); line-height: 1.6; }

/* ===== Disclaimer Box ===== */
.disclaimer-box {
  background: #fffbeb; border: 1px solid #fde68a; border-radius: var(--radius-sm);
  padding: 14px 18px; font-size: .85rem; color: #92400e; margin-bottom: 28px; line-height: 1.6;
}
.disclaimer-box strong { color: #78350f; }

/* ===== Content Section (for calc info text) ===== */
.content-section { margin-bottom: 36px; }
.content-section h2 { font-size: 1.25rem; font-weight: 700; margin-bottom: 14px; color: #0f172a; letter-spacing: -.2px; }
.content-section h3 { font-size: 1.1rem; font-weight: 600; margin-top: 20px; margin-bottom: 10px; color: #0f172a; }
.content-section p { color: var(--text-muted); line-height: 1.8; margin-bottom: 14px; font-size: .95rem; }
.content-section ul { color: var(--text-muted); padding-left: 20px; margin-bottom: 14px; }
.content-section li { margin-bottom: 8px; line-height: 1.6; }
.content-section li strong { color: var(--text); }
.ref-list { font-size: .82rem; color: var(--text-light); border-top: 1px solid var(--border); padding-top: 14px; margin-top: 16px; }
.ref-list a { color: var(--text-light); }

/* ===== Blog ===== */
.blog-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 24px; }
.blog-card {
  background: var(--bg-card); border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow); border: 1px solid var(--border);
  transition: all .25s; display: flex; flex-direction: column;
}
.blog-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-3px); border-color: var(--primary-light); }
.blog-card-body { padding: 24px; flex: 1; display: flex; flex-direction: column; }
.blog-card-img { display: none; }
.blog-card-cat {
  font-size: .75rem; font-weight: 600; color: var(--primary); text-transform: uppercase; letter-spacing: .8px;
  margin-bottom: 6px; display: inline-flex; align-items: center; gap: 6px;
}
.blog-card-cat::before { content: '◆'; font-size: .5rem; color: var(--primary); }
.blog-card h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 10px; line-height: 1.45; letter-spacing: -.2px; }
.blog-card h3 a { color: #0f172a; }
.blog-card h3 a:hover { color: var(--primary); text-decoration: none; }
.blog-card p { font-size: .88rem; color: var(--text-muted); flex: 1; line-height: 1.7; }
.blog-card .blog-meta { font-size: .8rem; color: var(--text-light); margin-top: 16px; padding-top: 12px; border-top: 1px solid var(--border); display: flex; justify-content: space-between; }

/* ===== Blog Detail Page ===== */
.blog-detail { max-width: 760px; margin: 0 auto; }
.blog-detail-article {
  background: var(--bg-card); border-radius: var(--radius); padding: 40px; box-shadow: var(--shadow);
  border: 1px solid var(--border);
}
.blog-detail-article .blog-back { display: inline-flex; align-items: center; gap: 6px; font-size: .88rem; color: var(--text-muted); margin-bottom: 16px; }
.blog-detail-article .blog-back:hover { color: var(--primary); text-decoration: none; }
.blog-detail-article .blog-cat-label { font-size: .78rem; font-weight: 600; color: var(--primary); text-transform: uppercase; letter-spacing: .8px; }
.blog-detail-article h1 { font-size: 2rem; font-weight: 800; margin: 8px 0 10px; line-height: 1.25; letter-spacing: -.5px; }
.blog-detail-article .blog-detail-meta { color: var(--text-light); font-size: .85rem; margin-bottom: 28px; padding-bottom: 20px; border-bottom: 1px solid var(--border); }
.blog-detail-article .blog-content p { color: var(--text-muted); line-height: 1.85; margin-bottom: 18px; font-size: 1rem; }
.blog-detail-article .blog-content h2 { font-size: 1.4rem; font-weight: 700; margin: 32px 0 14px; color: #0f172a; letter-spacing: -.3px; }
.blog-detail-article .blog-content h3 { font-size: 1.15rem; font-weight: 600; margin: 24px 0 10px; color: #0f172a; }
.blog-detail-article .blog-content ul, .blog-detail-article .blog-content ol { color: var(--text-muted); padding-left: 24px; margin-bottom: 18px; }
.blog-detail-article .blog-content li { margin-bottom: 8px; line-height: 1.7; }
.blog-detail-article .blog-content li strong { color: var(--text); }
.blog-detail-article .blog-content blockquote {
  border-left: 4px solid var(--primary-light); padding: 16px 20px; margin: 20px 0;
  background: #f8fafc; border-radius: 0 var(--radius-sm) var(--radius-sm) 0; color: var(--text-muted); font-style: italic;
}
.blog-detail-article .blog-footer { margin-top: 32px; padding-top: 20px; border-top: 1px solid var(--border); font-size: .85rem; color: var(--text-light); }

/* ===== Pagination ===== */
.pagination { display: flex; justify-content: center; align-items: center; gap: 6px; margin-top: 40px; }
.pagination a, .pagination span {
  display: inline-flex; align-items: center; justify-content: center; min-width: 42px; height: 42px;
  padding: 0 14px; border-radius: var(--radius-sm); font-size: .9rem; font-weight: 500; color: var(--text);
  border: 1px solid var(--border); transition: all .2s;
}
.pagination a:hover { background: var(--primary-light); border-color: var(--primary); text-decoration: none; }
.pagination .active { background: var(--primary); color: #fff; border-color: var(--primary); }
.pagination .disabled { color: var(--text-light); cursor: default; pointer-events: none; opacity: .5; }

/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item { border: 1px solid var(--border); border-radius: var(--radius-sm); margin-bottom: 10px; overflow: hidden; transition: border-color .2s; }
.faq-item:hover { border-color: var(--primary-light); }
.faq-q {
  padding: 18px 22px; background: var(--bg-card); cursor: pointer; display: flex;
  justify-content: space-between; align-items: center; font-weight: 600; font-size: .95rem;
  transition: background .2s; user-select: none; gap: 12px;
}
.faq-q:hover { background: #f8fafc; }
.faq-q .faq-toggle { font-size: .8rem; transition: transform .3s; color: var(--text-light); flex-shrink: 0; }
.faq-item.open .faq-q .faq-toggle { transform: rotate(180deg); }
.faq-a { padding: 0 22px; max-height: 0; overflow: hidden; transition: all .3s ease; color: var(--text-muted); font-size: .9rem; line-height: 1.75; }
.faq-item.open .faq-a { padding: 0 22px 20px; max-height: 600px; }

/* ===== Cookie Consent ===== */
.cookie-consent {
  position: fixed; bottom: 0; left: 0; right: 0; background: #0f172a; color: #cbd5e1;
  padding: 16px 20px; z-index: 9999; display: none; box-shadow: 0 -8px 20px rgba(0,0,0,.15);
}
.cookie-inner { max-width: var(--max-width); margin: 0 auto; display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.cookie-inner p { font-size: .88rem; flex: 1; min-width: 250px; line-height: 1.6; }
.cookie-inner a { color: #93c5fd; }
.cookie-btns { display: flex; gap: 10px; flex-shrink: 0; }
.cookie-btns button { padding: 10px 22px; border: none; border-radius: var(--radius-sm); font-weight: 600; cursor: pointer; font-size: .85rem; }
.btn-accept { background: var(--primary); color: #fff; }
.btn-accept:hover { background: var(--primary-dark); }
.btn-decline { background: #334155; color: #cbd5e1; }
.btn-decline:hover { background: #475569; }

/* ===== Page Header ===== */
.page-header { text-align: center; padding: 32px 20px 20px; }
.page-header h1 { font-size: 2rem; font-weight: 800; margin-bottom: 10px; letter-spacing: -.4px; }
.page-header p { color: var(--text-muted); font-size: 1rem; max-width: 600px; margin: 0 auto; line-height: 1.7; }

/* ===== Legal Pages ===== */
.legal-content { max-width: 800px; margin: 0 auto; }
.legal-content h1 { font-size: 2rem; font-weight: 800; letter-spacing: -.4px; }
.legal-content h2 { font-size: 1.3rem; font-weight: 700; margin-top: 36px; margin-bottom: 12px; color: #0f172a; letter-spacing: -.2px; }
.legal-content h3 { font-size: 1.1rem; font-weight: 600; margin-top: 24px; margin-bottom: 10px; color: #0f172a; }
.legal-content p { color: var(--text-muted); line-height: 1.85; margin-bottom: 14px; font-size: .95rem; }
.legal-content ul, .legal-content ol { color: var(--text-muted); padding-left: 24px; margin-bottom: 14px; }
.legal-content li { margin-bottom: 8px; line-height: 1.7; }
.legal-content .last-updated { color: var(--text-light); font-size: .88rem; margin-bottom: 28px; }
.legal-content .table-wrap { overflow-x: auto; margin-bottom: 20px; }
.legal-content table { width: 100%; border-collapse: collapse; font-size: .88rem; }
.legal-content th, .legal-content td { border: 1px solid var(--border); padding: 10px 14px; text-align: left; }
.legal-content th { background: #f8fafc; font-weight: 600; }

/* ===== Contact Page ===== */
.contact-form { max-width: 560px; margin: 0 auto; }
.contact-form h1 { font-size: 2rem; font-weight: 800; letter-spacing: -.4px; }
.contact-form textarea { width: 100%; padding: 12px 16px; border: 1.5px solid var(--border); border-radius: var(--radius-sm); font-size: 1rem; font-family: inherit; resize: vertical; min-height: 140px; transition: border-color .2s; }
.contact-form textarea:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 4px var(--primary-light); }

/* ===== About Page ===== */
.about-content { max-width: 700px; margin: 0 auto; text-align: center; }
.about-content h1 { font-size: 2rem; font-weight: 800; letter-spacing: -.4px; }
.about-content p { color: var(--text-muted); line-height: 1.85; margin-bottom: 18px; font-size: 1rem; }
.about-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin: 36px 0; }
.about-stat { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; }
.about-stat .num { font-size: 2rem; font-weight: 800; color: var(--primary); letter-spacing: -1px; }
.about-stat .label { font-size: .85rem; color: var(--text-muted); margin-top: 4px; }

/* ===== Homepage Feature Sections ===== */
.feature-highlights {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px;
  margin-bottom: 48px;
}
.feature-item {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px 22px; text-align: center; transition: all .25s;
}
.feature-item:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); border-color: var(--primary-light); }
.feature-item .fi-icon { font-size: 2.2rem; margin-bottom: 10px; }
.feature-item h3 { font-size: 1rem; font-weight: 700; margin-bottom: 6px; color: #0f172a; }
.feature-item p { font-size: .85rem; color: var(--text-muted); line-height: 1.6; }

.site-stats {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 0;
  background: linear-gradient(135deg, #2563eb, #1d4ed8); border-radius: var(--radius); overflow: hidden;
  margin-bottom: 48px; color: #fff;
}
.site-stat { text-align: center; padding: 32px 16px; position: relative; }
.site-stat:not(:last-child)::after { content: ''; position: absolute; right: 0; top: 20%; height: 60%; width: 1px; background: rgba(255,255,255,.15); }
.site-stat .ss-num { font-size: 2.2rem; font-weight: 800; letter-spacing: -1px; }
.site-stat .ss-label { font-size: .85rem; opacity: .85; margin-top: 4px; }

.blog-preview-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 24px; margin-bottom: 48px; }

.testimonial-section { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 40px; margin-bottom: 48px; }
.testimonial-section h2 { text-align: center; margin-bottom: 28px; }
.testimonials { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.testimonial { text-align: center; padding: 20px; }
.testimonial .quote { font-style: italic; color: var(--text-muted); font-size: .9rem; line-height: 1.7; margin-bottom: 12px; }
.testimonial .author { font-weight: 600; font-size: .85rem; color: var(--text); }
.section-title-centered { text-align: center; font-size: 1.5rem; font-weight: 700; margin-bottom: 24px; letter-spacing: -.3px; }

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .feature-highlights { grid-template-columns: 1fr 1fr; }
  .site-stats { grid-template-columns: 1fr 1fr; }
  .site-stat:nth-child(2)::after { display: none; }
}
@media (max-width: 768px) {
  .hero h1 { font-size: 2rem; }
  .main-nav { display: none; }
  .main-nav.open { display: flex; flex-direction: column; position: absolute; top: var(--header-height); left: 0; right: 0; background: #fff; border-bottom: 1px solid var(--border); padding: 12px; box-shadow: var(--shadow-lg); }
  .nav-toggle { display: block; }
  .form-row { grid-template-columns: 1fr; }
  .blog-grid, .blog-preview-grid { grid-template-columns: 1fr 1fr; }
  .testimonials { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .about-stats { grid-template-columns: 1fr; }
  .main-content.wide { padding-left: 16px; padding-right: 16px; }
  .calc-container { padding: 24px; }
  .blog-detail-article { padding: 24px; }
  .hero .subtitle { flex-direction: column; gap: 6px; }
}
@media (max-width: 480px) {
  .blog-grid, .blog-preview-grid { grid-template-columns: 1fr; }
  .cards-grid { grid-template-columns: 1fr; }
  .feature-highlights { grid-template-columns: 1fr; }
  .site-stats { grid-template-columns: 1fr; }
  .site-stat::after { display: none !important; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 1.6rem; }
  .blog-detail-article h1 { font-size: 1.5rem; }
}

/* ===== Print ===== */
@media print {
  .site-header, .site-footer, .cookie-consent, .nav-toggle, .btn, .pagination { display: none !important; }
  body { background: #fff; color: #000; }
  .main-content { padding: 0; }
  .card, .blog-card, .calc-container, .blog-detail-article { box-shadow: none; border: 1px solid #ddd; break-inside: avoid; }
  .hero h1 { -webkit-text-fill-color: #0f172a; }
}