/* ===== Theme tokens ===== */
:root {
  --color-primary: #d97757;
  --color-primary-dark: #c6613f;
  --color-primary-light: #f7ede6;
  --color-primary-light-strong: #f0ddd0;
  --color-accent: #3d3d3a;
  --color-success: #5a7a3a;
  --color-success-bg: #eaf0e3;
  --color-warning: #9a5c20;
  --color-warning-bg: #faf0e4;
  --color-error: #b84040;
  --color-bg: #faf9f5;
  --color-bg-alt: #f0eee6;
  --color-text: #141413;
  --color-text-muted: #5e5d59;
  --color-border: rgba(20, 20, 19, 0.12);
  --color-card: #ffffff;
  --font-sans: Inter, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --radius: 14px;
  --radius-sm: 9px;
  --radius-pill: 999px;
  --shadow: 0 1px 2px rgba(15, 35, 30, 0.04), 0 6px 16px rgba(15, 35, 30, 0.06);
  --shadow-hover: 0 10px 28px rgba(15, 35, 30, 0.12);
}

[data-theme="dark"] {
  --color-primary: #e08b69;
  --color-primary-dark: #d97757;
  --color-primary-light: #2d1f18;
  --color-primary-light-strong: #3d2a1f;
  --color-success-bg: #1a2412;
  --color-warning-bg: #271a0c;
  --color-bg: #1a1918;
  --color-bg-alt: #211f1d;
  --color-text: #faf9f5;
  --color-text-muted: #b0aea5;
  --color-border: rgba(250, 249, 245, 0.12);
  --color-card: #252220;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 6px 16px rgba(0, 0, 0, 0.4);
  --shadow-hover: 0 10px 28px rgba(0, 0, 0, 0.5);
}

@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]) {
    --color-primary: #e08b69;
    --color-primary-dark: #d97757;
    --color-primary-light: #2d1f18;
    --color-primary-light-strong: #3d2a1f;
    --color-success-bg: #1a2412;
    --color-warning-bg: #271a0c;
    --color-bg: #1a1918;
    --color-bg-alt: #211f1d;
    --color-text: #faf9f5;
    --color-text-muted: #b0aea5;
    --color-border: rgba(250, 249, 245, 0.12);
    --color-card: #252220;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 6px 16px rgba(0, 0, 0, 0.4);
    --shadow-hover: 0 10px 28px rgba(0, 0, 0, 0.5);
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

a { color: var(--color-primary); text-decoration: underline; text-underline-offset: 2px; }
a:hover { text-decoration: none; }

h1, h2, h3 { line-height: 1.25; letter-spacing: -0.01em; font-weight: 700; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-primary);
  color: #fff;
  padding: 0.5rem 1rem;
  z-index: 1000;
  border-radius: 0 0 var(--radius) 0;
}
.skip-link:focus { left: 0; }

:focus-visible { outline: 3px solid var(--color-accent); outline-offset: 2px; border-radius: 4px; }

/* ===== Header / Nav ===== */
.site-header { background: var(--color-card); border-bottom: 1px solid var(--color-border); }
.site-header__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.1rem 1rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}
.site-header__logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 800;
  font-size: 1.15rem;
  text-decoration: none;
  color: var(--color-text);
  letter-spacing: -0.01em;
}
.site-header__tagline {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin: 0;
}

.site-nav { background: var(--color-bg-alt); border-bottom: 1px solid var(--color-border); }
.site-nav__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.6rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.site-nav__links { list-style: none; display: flex; gap: 0.35rem; margin: 0; padding: 0; flex-wrap: wrap; }
.site-nav__links a {
  text-decoration: none;
  color: var(--color-text-muted);
  font-weight: 600;
  font-size: 0.92rem;
  padding: 0.5rem 0.9rem;
  white-space: nowrap;
  border-radius: var(--radius-pill);
  transition: background-color 0.15s ease, color 0.15s ease;
}
.site-nav__links a:hover { background: var(--color-card); color: var(--color-text); }
.site-nav__links a[aria-current="page"] { color: var(--color-primary); background: var(--color-primary-light); }

/* ===== Fixed top-right controls (theme + language) ===== */
.controls-bar {
  position: fixed;
  top: 0.75rem;
  right: 0.75rem;
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  padding: 0.35rem;
  box-shadow: var(--shadow);
}

.icon-button {
  min-width: 44px;
  min-height: 44px;
  border: none;
  background: transparent;
  border-radius: var(--radius-pill);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text);
  transition: background-color 0.15s ease;
}
.icon-button:hover { background: var(--color-bg-alt); }
.icon-button .icon { display: block; }

.icon { color: currentColor; flex-shrink: 0; }

.lang-switcher { display: flex; gap: 0.25rem; }
.lang-switcher__item {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  min-height: 40px;
  border-radius: var(--radius-pill);
  border: none;
  text-decoration: none;
  transition: background-color 0.15s ease, opacity 0.15s ease;
  opacity: 0.75;
}
.lang-switcher__item:hover { background: var(--color-bg-alt); opacity: 1; }
.lang-switcher__item.is-active { background: var(--color-bg-alt); opacity: 1; box-shadow: 0 0 0 2px var(--color-primary); border-radius: var(--radius-sm); }

/* ===== Trust badges ===== */
.trust-badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.6rem;
  margin: 1.25rem 0 0;
}
.trust-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-pill);
}
.trust-badge .icon { color: var(--color-primary); width: 16px; height: 16px; }

/* ===== Breadcrumb ===== */
.breadcrumb { margin: 1rem 0; font-size: 0.9rem; }
.breadcrumb ol { list-style: none; display: flex; gap: 0.5rem; padding: 0; margin: 0; flex-wrap: wrap; }
.breadcrumb li:not(:last-child)::after { content: "›"; margin-left: 0.5rem; color: var(--color-text-muted); }
.breadcrumb a { color: var(--color-text-muted); text-decoration: none; }
.breadcrumb a:hover { color: var(--color-primary); }

/* ===== Layout ===== */
.page-wrap {
  display: flex;
  gap: 2rem;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem 2rem;
  align-items: flex-start;
}
.main-content { flex: 1 1 auto; min-width: 0; }
.sidebar { flex: 0 0 300px; }
@media (max-width: 900px) {
  .page-wrap { flex-direction: column; }
  .sidebar { flex: none; width: 100%; }
}

/* ===== Ads ===== */
.ad-slot { display: flex; align-items: center; justify-content: center; margin: 1.5rem 0; }
.ad-slot__placeholder {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-alt);
  border: 1px dashed var(--color-border);
  color: var(--color-text-muted);
  font-size: 0.85rem;
  border-radius: var(--radius);
}

/* ===== Hero / Home ===== */
.hero {
  position: relative;
  padding: 3rem 1rem 2.25rem;
  text-align: center;
  background:
    radial-gradient(60% 100% at 20% 0%, var(--color-primary-light) 0%, transparent 60%),
    radial-gradient(50% 90% at 85% 10%, var(--color-primary-light-strong) 0%, transparent 55%);
  border-bottom: 1px solid var(--color-border);
  margin: 0 -1rem 2rem;
}
.hero h1 { font-size: clamp(1.8rem, 4.4vw, 2.85rem); margin-bottom: 0.6rem; }
.hero p { color: var(--color-text-muted); max-width: 640px; margin: 0 auto; font-size: 1.1rem; }

.calc-grid-section { margin-top: 0; }
.calc-grid-section h2 { margin-top: 0; }

.calc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  margin: 1.25rem 0;
}
.calc-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  text-decoration: none;
  color: var(--color-text);
  display: block;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}
.calc-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); border-color: var(--color-primary-light-strong); }
.calc-card__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: var(--color-primary-light);
  color: var(--color-primary);
  margin-bottom: 1rem;
}
.calc-card h3 { margin: 0 0 0.5rem; color: var(--color-text); font-size: 1.1rem; }
.calc-card p { margin: 0; color: var(--color-text-muted); font-size: 0.95rem; }

.about-section, .faq-section { margin: 3rem 0; }
.faq-item { border-bottom: 1px solid var(--color-border); padding: 1rem 0; }
.faq-item h3 { margin: 0 0 0.5rem; font-size: 1.02rem; }
.faq-item p { margin: 0; color: var(--color-text-muted); }

/* ===== Blog ===== */
.blog-hero { padding: 2rem 0 1.5rem; border-bottom: 1px solid var(--color-border); margin-bottom: 2rem; }
.blog-hero h1 { margin: 0 0 0.5rem; font-size: clamp(1.6rem, 3.5vw, 2.2rem); }
.blog-hero p { color: var(--color-text-muted); margin: 0; }

.blog-grid { display: grid; gap: 1.5rem; margin-bottom: 2rem; }
.blog-card { background: var(--color-card); border: 1px solid var(--color-border); border-radius: var(--radius); padding: 1.75rem; box-shadow: var(--shadow); }
.blog-card__meta { display: flex; align-items: center; gap: 1rem; flex-wrap: wrap; margin-bottom: 0.75rem; }
.blog-card__meta time { font-size: 0.85rem; color: var(--color-text-muted); }
.blog-card__title { margin: 0 0 0.75rem; font-size: 1.3rem; }
.blog-card__title a { color: var(--color-text); text-decoration: none; }
.blog-card__title a:hover { color: var(--color-primary); }
.blog-card__excerpt { color: var(--color-text-muted); margin: 0 0 1rem; line-height: 1.7; }
.blog-card__read-more { color: var(--color-primary); font-weight: 600; text-decoration: none; font-size: 0.95rem; }
.blog-card__read-more:hover { text-decoration: underline; }
.blog-card__tags { display: flex; gap: 0.4rem; flex-wrap: wrap; }
.blog-tag { background: var(--color-primary-light); color: var(--color-primary-dark); font-size: 0.78rem; font-weight: 600; padding: 0.2rem 0.6rem; border-radius: var(--radius-pill); }

.blog-article { max-width: 780px; }
.blog-article__header { margin-bottom: 2rem; padding-bottom: 1.5rem; border-bottom: 1px solid var(--color-border); }
.blog-article__meta { display: flex; align-items: center; gap: 1.5rem; flex-wrap: wrap; margin-bottom: 1rem; font-size: 0.9rem; color: var(--color-text-muted); }
.blog-back { color: var(--color-text-muted); text-decoration: none; font-weight: 600; }
.blog-back:hover { color: var(--color-primary); }
.blog-article__header h1 { margin: 0.5rem 0; font-size: clamp(1.6rem, 3.5vw, 2.2rem); }
.blog-article__description { color: var(--color-text-muted); font-size: 1.05rem; margin: 0.5rem 0 1rem; }
.blog-article__footer { margin-top: 3rem; padding-top: 2rem; border-top: 1px solid var(--color-border); }

.prose { line-height: 1.8; color: var(--color-text); }
.prose h2 { font-size: 1.45rem; margin: 2.5rem 0 1rem; color: var(--color-text); }
.prose h3 { font-size: 1.15rem; margin: 2rem 0 0.75rem; color: var(--color-text); }
.prose p { margin: 0 0 1.25rem; color: var(--color-text-muted); }
.prose strong { color: var(--color-text); font-weight: 700; }
.prose ul, .prose ol { margin: 0 0 1.25rem 1.5rem; color: var(--color-text-muted); }
.prose li { margin-bottom: 0.4rem; }
.prose a { color: var(--color-primary); }
.prose blockquote { border-left: 4px solid var(--color-primary); margin: 1.5rem 0; padding: 0.75rem 1.25rem; background: var(--color-primary-light); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; }
.prose blockquote p { color: var(--color-text); margin: 0; }
.prose table { width: 100%; border-collapse: collapse; margin: 1.5rem 0; font-size: 0.95rem; }
.prose table th, .prose table td { border: 1px solid var(--color-border); padding: 0.6rem 0.85rem; }
.prose table th { background: var(--color-bg-alt); font-weight: 700; }

/* ===== Forms ===== */
.calculator-form { background: var(--color-card); border: 1px solid var(--color-border); border-radius: var(--radius); padding: 1.75rem; box-shadow: var(--shadow); }
.form-row { margin-bottom: 1.25rem; }
.form-row label { display: block; font-weight: 600; margin-bottom: 0.4rem; font-size: 0.95rem; }
.form-row .required-mark { color: var(--color-error); margin-left: 0.2rem; }
.form-row input, .form-row select {
  width: 100%;
  min-height: 46px;
  padding: 0.5rem 0.85rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 1rem;
  font-family: inherit;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.form-row input:focus, .form-row select:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px var(--color-primary-light);
  outline: none;
}
.form-row .hint { font-size: 0.85rem; color: var(--color-text-muted); margin-top: 0.3rem; }
.form-row .error-message { color: var(--color-error); font-size: 0.85rem; margin-top: 0.3rem; display: none; }
.form-row.has-error input, .form-row.has-error select { border-color: var(--color-error); }
.form-row.has-error .error-message { display: block; }
.input-group { display: flex; gap: 0.5rem; }
.input-group select { flex: 0 0 90px; }
.radio-group { display: flex; gap: 1rem; flex-wrap: wrap; }
.radio-group label { display: flex; align-items: center; gap: 0.4rem; font-weight: 400; min-height: 44px; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0.65rem 1.75rem;
  border-radius: var(--radius-sm);
  border: none;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.12s ease, box-shadow 0.12s ease, background-color 0.12s ease;
}
.btn-primary { background: var(--color-primary); color: #fff; box-shadow: 0 4px 14px rgba(15, 118, 110, 0.28); }
.btn-primary:hover { background: var(--color-primary-dark); transform: translateY(-1px); box-shadow: 0 6px 18px rgba(15, 118, 110, 0.34); }
.btn-secondary { background: transparent; color: var(--color-text); border: 1.5px solid var(--color-border); }
.btn[disabled] { opacity: 0.7; cursor: progress; transform: none; }

@media (max-width: 480px) {
  .btn { width: 100%; }
}

/* ===== Results ===== */
.results-section { margin-top: 2rem; }
.results-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 1rem; margin: 1rem 0; }
.result-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-sm);
  padding: 1rem;
}
.result-card .label { font-size: 0.85rem; color: var(--color-text-muted); margin: 0 0 0.25rem; }
.result-card .value { font-size: 1.5rem; font-weight: 700; margin: 0; }
.result-card.success { border-left-color: var(--color-success); background: var(--color-success-bg); }
.result-card.warning { border-left-color: var(--color-warning); background: var(--color-warning-bg); }

.result-card--hero {
  grid-column: 1 / -1;
  order: -1;
  border: 1px solid var(--color-primary-light-strong);
  border-left: 4px solid var(--color-primary);
  background: var(--color-primary-light);
  padding: 1.5rem 1.75rem;
  text-align: center;
}
.result-card--hero .label { font-size: 0.95rem; font-weight: 600; }
.result-card--hero .value { font-size: clamp(2rem, 6vw, 2.75rem); color: var(--color-primary-dark); }

.formula-box {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 1rem;
  margin-top: 1rem;
  font-size: 0.95rem;
}

table.amort-table { width: 100%; border-collapse: collapse; margin-top: 1rem; font-size: 0.9rem; }
table.amort-table th, table.amort-table td { border: 1px solid var(--color-border); padding: 0.5rem; text-align: right; }
table.amort-table th:first-child, table.amort-table td:first-child { text-align: left; }
table.amort-table th { background: var(--color-bg-alt); }
.table-wrap { overflow-x: auto; }

/* ===== Content / article ===== */
.calc-content { margin-top: 3rem; }
.calc-content h2 { margin-top: 2rem; }
.calc-content p { color: var(--color-text-muted); }

.related-calcs ul { list-style: none; padding: 0; }
.related-calcs li { margin-bottom: 0.5rem; }

/* ===== Footer ===== */
.site-footer { background: var(--color-bg-alt); border-top: 1px solid var(--color-border); margin-top: 3rem; }
.site-footer__inner { max-width: 1200px; margin: 0 auto; padding: 2rem 1rem; color: var(--color-text-muted); font-size: 0.9rem; }
.site-footer__links { list-style: none; display: flex; gap: 1rem; flex-wrap: wrap; padding: 0; }
.site-footer__links a { color: var(--color-text-muted); text-decoration: none; }
.site-footer__disclaimer { font-style: italic; }

/* ===== Error pages ===== */
.error-page { text-align: center; padding: 4rem 1rem; }
.error-page h1 { font-size: 4rem; margin: 0; color: var(--color-primary); }

/* ===== Responsive: tablet ===== */
@media (max-width: 768px) {
  .site-header__inner { padding: 0.75rem 1rem; gap: 0.5rem; }
  .site-header__tagline { font-size: 0.85rem; }
  .site-nav__inner { padding: 0.4rem 1rem; }
  .site-nav__links { gap: 0.3rem; }

  .controls-bar { top: 0.5rem; right: 0.5rem; }

  .hero { padding: 2rem 1rem 1.5rem; margin: 0 -1rem 1.5rem; }
  .hero p { font-size: 1rem; }

  .calc-grid { grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 1rem; }
  .calc-card { padding: 1.1rem; }

  .page-wrap { padding: 0 0.75rem 1.5rem; gap: 1.5rem; }
  .calculator-form { padding: 1.1rem; }
  .results-grid { grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); }
}

/* ===== Responsive: mobile ===== */
@media (max-width: 480px) {
  .site-header__inner { padding: 0.6rem 9.5rem 0.6rem 0.75rem; }
  .site-header__logo span {
    font-size: 1rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 40vw;
  }
  .site-header__tagline { display: none; }
  .site-nav__inner { padding: 0.35rem 0.75rem; }
  .site-nav__links { gap: 0.25rem; }
  .site-nav__links a { font-size: 0.85rem; padding: 0.45rem 0.7rem; }

  .controls-bar { padding: 0.25rem; gap: 0.35rem; }
  .controls-bar .icon-button { min-width: 38px; min-height: 38px; }
  .lang-switcher__item { min-width: 34px; min-height: 34px; }

  .hero { padding: 1.5rem 0.75rem 1.1rem; }
  .hero h1 { font-size: clamp(1.5rem, 6vw, 1.9rem); }
  .hero p { font-size: 0.95rem; }
  .trust-badges { gap: 0.4rem; }
  .trust-badge { font-size: 0.75rem; padding: 0.35rem 0.65rem; }

  .calc-grid { grid-template-columns: 1fr; gap: 0.75rem; margin: 1rem 0; }
  .calc-card { padding: 1rem; }

  .page-wrap { padding: 0 0.5rem 1.25rem; }
  .calculator-form { padding: 1rem; }
  .form-row input, .form-row select { font-size: 16px; }
  .input-group { flex-direction: column; }
  .input-group select { flex: 1 1 auto; }
  .radio-group { flex-direction: column; gap: 0.5rem; }

  .results-grid { grid-template-columns: 1fr 1fr; gap: 0.75rem; }
  .result-card .value { font-size: 1.25rem; }
  .result-card--hero { padding: 1.25rem 1rem; }

  table.amort-table { font-size: 0.8rem; }
  table.amort-table th, table.amort-table td { padding: 0.35rem; }

  .site-footer__inner { padding: 1.5rem 1rem; }
  .site-footer__links { gap: 0.75rem; }
}