:root {
  --green-950: #003d35;
  --green-800: #006b53;
  --green-700: #02845f;
  --green-100: #e9f7f1;
  --cyan: #139de0;
  --amber: #f2a30f;
  --orange: #ef7d22;
  --ink: #111827;
  --muted: #586574;
  --line: #dce3e6;
  --soft: #f5f8f8;
  --soft-2: #eef5f5;
  --white: #ffffff;
  --shadow: 0 18px 50px rgba(17, 24, 39, 0.1);
  --radius: 8px;
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  line-height: 1.5;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
select {
  font: inherit;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 28px;
  min-height: 70px;
  padding: 0 42px;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: baseline;
  font-size: 2rem;
  font-weight: 900;
  letter-spacing: 0;
  white-space: nowrap;
}

.brand span {
  color: var(--green-700);
}

.desktop-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 0.96rem;
}

.desktop-nav a,
.site-footer a {
  color: #1e293b;
}

.desktop-nav a:hover,
.site-footer a:hover {
  color: var(--green-700);
}

.header-search {
  margin-left: auto;
}

.header-search input,
.tool-search input,
.field-control input,
.field-control select,
.suggest-form input {
  width: 100%;
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0 14px;
  color: var(--ink);
  background: var(--white);
  outline: none;
}

.header-search input {
  width: 245px;
}

.header-search input:focus,
.tool-search input:focus,
.field-control input:focus,
.field-control select:focus,
.suggest-form input:focus {
  border-color: var(--green-700);
  box-shadow: 0 0 0 3px rgba(2, 132, 95, 0.13);
}

.dark-btn,
.calculate-btn,
.share-btn,
.plain-btn,
.suggest-btn,
.category-tab,
.card-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  padding: 0 18px;
  font-size: 0.94rem;
  font-weight: 800;
  cursor: pointer;
  transition:
    background-color 150ms ease,
    border-color 150ms ease,
    color 150ms ease,
    transform 150ms ease;
}

.dark-btn,
.calculate-btn,
.share-btn,
.category-tab.is-active {
  color: var(--white);
  background: var(--green-950);
}

.dark-btn:hover,
.calculate-btn:hover,
.share-btn:hover {
  background: var(--green-800);
  transform: translateY(-1px);
}

.plain-btn,
.suggest-btn,
.category-tab,
.card-link {
  color: var(--green-950);
  background: var(--white);
  border-color: var(--line);
}

.plain-btn:hover,
.suggest-btn:hover,
.category-tab:hover,
.card-link:hover {
  border-color: var(--green-700);
}

.compact {
  min-height: 40px;
}

.menu-btn {
  display: none;
  width: 44px;
  height: 44px;
  flex: 0 0 auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
  cursor: pointer;
}

.menu-btn span:not(.sr-only) {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  background: var(--ink);
}

.mobile-nav {
  display: none;
  position: sticky;
  top: 70px;
  z-index: 19;
  padding: 12px 24px 20px;
  background: var(--white);
  border-bottom: 1px solid var(--line);
}

.mobile-nav a {
  display: block;
  padding: 12px 0;
  border-top: 1px solid var(--line);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 560px;
  gap: 34px;
  align-items: end;
  padding: 38px 42px 26px;
}

.hero h1 {
  max-width: 760px;
  margin: 0 0 12px;
  font-size: clamp(2.45rem, 4.2vw, 4.55rem);
  line-height: 1.06;
  letter-spacing: 0;
}

.hero h1 span {
  color: var(--green-700);
}

.hero-copy p {
  max-width: 620px;
  margin: 0;
  color: var(--muted);
  font-size: 1.12rem;
}

.ad-slot {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 90px;
  color: #6b7280;
  background: #eef0f1;
  border: 1px solid #e2e5e6;
  border-radius: var(--radius);
  text-align: center;
}

.ad-slot span {
  font-size: 1rem;
}

.ad-slot strong {
  margin-top: 4px;
  font-size: 1rem;
  font-weight: 500;
}

.category-dock {
  position: sticky;
  top: 70px;
  z-index: 18;
  margin: 0 42px 28px;
  padding: 12px;
  background: rgba(255, 255, 255, 0.96);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 16px 36px rgba(17, 24, 39, 0.08);
  backdrop-filter: blur(18px);
}

.main-category-dock {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}

.main-category-btn {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  min-height: 72px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 10px 12px;
  color: var(--ink);
  background: var(--white);
  text-align: left;
  cursor: pointer;
  transition:
    background-color 150ms ease,
    border-color 150ms ease,
    color 150ms ease,
    transform 150ms ease;
}

.main-category-btn:hover {
  border-color: var(--green-700);
  transform: translateY(-1px);
}

.main-category-btn.is-active {
  color: var(--white);
  background: var(--green-950);
  border-color: var(--green-950);
}

.main-category-btn strong,
.main-category-btn small {
  display: block;
}

.main-category-btn strong {
  font-size: 0.98rem;
}

.main-category-btn small {
  color: var(--muted);
  font-size: 0.78rem;
}

.main-category-btn.is-active small {
  color: rgba(255, 255, 255, 0.78);
}

.main-category-btn em {
  display: grid;
  place-items: center;
  min-width: 28px;
  height: 28px;
  border-radius: 999px;
  color: var(--green-950);
  background: var(--green-100);
  font-size: 0.76rem;
  font-style: normal;
  font-weight: 900;
}

.category-mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 999px;
  color: var(--green-700);
  background: var(--green-100);
  font-weight: 900;
}

.sub-category-dock {
  display: flex;
  gap: 8px;
  margin-top: 10px;
  padding-top: 10px;
  overflow-x: auto;
  border-top: 1px solid var(--line);
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.main-category-dock {
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.main-category-dock::-webkit-scrollbar,
.sub-category-dock::-webkit-scrollbar {
  width: 0;
  height: 0;
}

.subcategory-btn {
  min-height: 36px;
  flex: 0 0 auto;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0 14px;
  color: var(--green-950);
  background: var(--soft);
  font-size: 0.86rem;
  font-weight: 850;
  cursor: pointer;
}

.subcategory-btn:hover,
.subcategory-btn.is-active {
  color: var(--white);
  background: var(--green-700);
  border-color: var(--green-700);
}

.calculator-shell {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  margin: 0 42px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.calculator-sidebar {
  padding: 24px 22px;
  background: var(--soft);
  border-right: 1px solid var(--line);
}

.sidebar-label {
  display: grid;
  gap: 2px;
  margin-top: 14px;
  padding: 12px;
  color: var(--muted);
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.sidebar-label span {
  color: var(--green-700);
  font-size: 0.74rem;
  font-weight: 900;
  text-transform: uppercase;
}

.sidebar-label strong {
  color: #1f2937;
  font-size: 0.82rem;
}

.tool-list {
  display: grid;
  gap: 6px;
  margin: 18px 0 32px;
}

.tool-group-block {
  display: grid;
  gap: 6px;
}

.tool-group-block + .tool-group-block {
  margin-top: 14px;
}

.tool-group-heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 3px 8px;
  padding: 8px 4px 4px;
}

.tool-group-heading span {
  grid-column: 1 / -1;
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 850;
  text-transform: uppercase;
}

.tool-group-heading strong {
  font-size: 0.88rem;
}

.tool-group-heading em {
  color: var(--muted);
  font-size: 0.76rem;
  font-style: normal;
  font-weight: 800;
}

.tool-button {
  display: grid;
  grid-template-columns: 30px 38px minmax(0, 1fr);
  gap: 10px;
  align-items: center;
  width: 100%;
  min-height: 58px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  padding: 8px 10px;
  color: var(--ink);
  background: transparent;
  text-align: left;
  cursor: pointer;
}

.tool-order {
  color: var(--muted);
  font-size: 0.74rem;
  font-weight: 900;
  letter-spacing: 0.04em;
}

.tool-button:hover {
  background: var(--white);
  border-color: var(--line);
}

.tool-button.is-active {
  color: var(--white);
  background: var(--green-700);
}

.tool-button.is-active .tool-order {
  color: rgba(255, 255, 255, 0.76);
}

.tool-button span {
  display: block;
}

.tool-button strong {
  font-size: 0.95rem;
}

.tool-button small {
  color: var(--muted);
  font-size: 0.8rem;
}

.tool-button.is-active small {
  color: rgba(255, 255, 255, 0.86);
}

.tool-button .mini-icon,
.tool-icon {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 999px;
  color: var(--green-700);
  background: var(--white);
  border: 1px solid var(--line);
  font-weight: 900;
}

.tool-button.is-active .mini-icon {
  color: var(--green-700);
}

.suggest-btn {
  width: 100%;
}

.empty-state {
  margin: 0;
  padding: 14px;
  color: var(--muted);
  background: var(--white);
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  font-size: 0.9rem;
}

.calculator-panel {
  min-width: 0;
  background: var(--white);
}

.calculator-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 28px 32px;
  border-bottom: 1px solid var(--line);
}

.calculator-title {
  display: flex;
  align-items: center;
  gap: 16px;
}

.tool-icon {
  width: 58px;
  height: 58px;
  color: var(--white);
  background: var(--green-700);
  font-size: 1.5rem;
}

.calculator-title h2 {
  margin: 0 0 3px;
  font-size: 1.45rem;
  letter-spacing: 0;
}

.calculator-title p {
  margin: 0;
  color: var(--muted);
}

.panel-actions {
  display: flex;
  gap: 12px;
}

.calculator-grid {
  display: grid;
  grid-template-columns: minmax(320px, 0.8fr) minmax(340px, 1fr);
  min-height: 510px;
}

.input-panel,
.results-panel {
  padding: 28px 32px;
}

.input-panel {
  border-right: 1px solid var(--line);
}

.input-panel h3,
.results-panel h3 {
  margin: 0 0 20px;
  font-size: 1.05rem;
}

.field-grid {
  display: grid;
  gap: 18px;
}

.field-control {
  display: grid;
  gap: 7px;
}

.field-control label {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #1f2937;
  font-size: 0.9rem;
  font-weight: 700;
}

.field-control .hint {
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 500;
}

.field-input-wrap {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.field-input-wrap span {
  display: grid;
  place-items: center;
  color: var(--muted);
  background: var(--soft);
  border-right: 1px solid var(--line);
  font-weight: 800;
}

.field-input-wrap input,
.field-input-wrap select {
  min-height: 46px;
  border: 0;
  border-radius: 0;
}

.calculate-btn {
  width: 100%;
  margin-top: 20px;
}

.validation-message {
  min-height: 22px;
  margin: 10px 0 0;
  color: #b91c1c;
  font-size: 0.88rem;
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.result-card {
  min-height: 124px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

.result-card.wide {
  grid-column: 1 / -1;
}

.result-card span {
  display: block;
  color: #1f2937;
  font-size: 0.9rem;
  font-weight: 800;
}

.result-card strong {
  display: block;
  margin: 10px 0 8px;
  color: var(--green-700);
  font-size: clamp(1.45rem, 2.5vw, 2rem);
  line-height: 1.05;
}

.result-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.86rem;
}

.wide-ad,
.ad-row {
  margin: 38px 42px;
}

.category-section,
.suggest-section {
  padding: 18px 42px 34px;
}

.section-heading h2 {
  margin: 0 0 7px;
  font-size: 2rem;
  letter-spacing: 0;
}

.section-heading p {
  max-width: 720px;
  margin: 0;
  color: var(--muted);
}

.category-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 24px 0;
}

.calculator-cards {
  display: grid;
  gap: 32px;
}

.calculator-card-group {
  display: grid;
  gap: 16px;
}

.calculator-card-heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 2px 16px;
  align-items: end;
  padding-top: 10px;
  border-top: 1px solid var(--line);
}

.calculator-card-heading span {
  grid-column: 1 / -1;
  color: var(--green-700);
  font-size: 0.78rem;
  font-weight: 900;
  text-transform: uppercase;
}

.calculator-card-heading h3 {
  margin: 0;
  font-size: 1.32rem;
}

.calculator-card-heading p {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.calculator-card-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.calculator-card {
  display: grid;
  min-height: 220px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

.card-topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.card-order {
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.calculator-card .card-icon {
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  border: 2px solid currentColor;
  border-radius: 999px;
  color: var(--green-700);
  font-size: 1.25rem;
  font-weight: 900;
}

.calculator-card h3 {
  margin: 20px 0 8px;
  font-size: 1.08rem;
}

.calculator-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.calculator-card .card-link {
  justify-self: start;
  align-self: end;
  margin-top: 24px;
  color: var(--green-700);
  border: 0;
  padding: 0;
  min-height: auto;
}

.suggest-section {
  display: flex;
  justify-content: center;
  border-top: 1px solid var(--line);
}

.suggest-form {
  display: grid;
  gap: 10px;
  width: min(720px, 100%);
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--soft);
}

.suggest-form label {
  font-weight: 900;
}

.suggest-form div {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
}

.suggest-form p {
  min-height: 24px;
  color: var(--green-700);
  font-size: 0.9rem;
}

.ad-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 18px;
}

.site-footer {
  display: grid;
  grid-template-columns: 1.5fr repeat(2, minmax(150px, 0.75fr));
  gap: 42px;
  padding: 38px 42px 32px;
  background: var(--soft);
  border-top: 1px solid var(--line);
}

.site-footer p {
  max-width: 330px;
  margin: 12px 0 0;
  color: var(--muted);
}

.footer-brand {
  font-size: 1.6rem;
}

.site-footer h2 {
  margin: 0 0 12px;
  font-size: 0.86rem;
  text-transform: uppercase;
}

.site-footer a:not(.brand) {
  display: block;
  margin: 7px 0;
  font-size: 0.92rem;
}

.toast {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 30;
  max-width: min(380px, calc(100vw - 40px));
  padding: 14px 18px;
  color: var(--white);
  background: var(--green-950);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transform: translateY(120%);
  opacity: 0;
  transition:
    transform 180ms ease,
    opacity 180ms ease;
}

.toast.is-visible {
  transform: translateY(0);
  opacity: 1;
}

@media (max-width: 1180px) {
  .desktop-nav {
    display: none;
  }

  .hero {
    grid-template-columns: 1fr;
  }

  .hero-ad {
    max-width: 728px;
  }

  .calculator-shell {
    grid-template-columns: 260px minmax(0, 1fr);
  }

  .calculator-grid {
    grid-template-columns: 1fr;
  }

  .input-panel {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .calculator-card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

}

@media (max-width: 900px) {
  .site-header {
    padding: 0 22px;
  }

  .header-search,
  .site-header .dark-btn {
    display: none;
  }

  .menu-btn {
    display: block;
    margin-left: auto;
  }

  .mobile-nav.is-open {
    display: block;
  }

  .hero,
  .category-section,
  .suggest-section,
  .site-footer {
    padding-left: 22px;
    padding-right: 22px;
  }

  .calculator-shell,
  .category-dock,
  .wide-ad,
  .ad-row {
    margin-left: 22px;
    margin-right: 22px;
  }

  .main-category-dock {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .calculator-shell {
    grid-template-columns: 1fr;
  }

  .calculator-sidebar {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .calculator-title-row,
  .site-footer,
  .ad-row {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .brand {
    font-size: 1.42rem;
  }

  .hero h1 {
    font-size: 2.35rem;
  }

  .tool-list,
  .calculator-card-grid,
  .result-grid {
    grid-template-columns: 1fr;
  }

  .category-dock {
    top: 70px;
    padding: 10px;
  }

  .main-category-dock {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .main-category-btn {
    position: relative;
    grid-template-columns: 1fr;
    gap: 8px;
    min-height: 98px;
    padding: 12px;
  }

  .category-mark {
    width: 36px;
    height: 36px;
  }

  .main-category-btn strong {
    max-width: 100%;
    padding-right: 24px;
    font-size: 0.92rem;
    line-height: 1.18;
  }

  .main-category-btn small {
    display: none;
  }

  .main-category-btn em {
    position: absolute;
    top: 12px;
    right: 10px;
    min-width: 24px;
    height: 24px;
  }

  .sub-category-dock {
    flex-wrap: wrap;
    overflow: visible;
  }

  .subcategory-btn {
    flex: 1 1 calc(50% - 8px);
  }

  .calculator-title {
    align-items: flex-start;
    flex-direction: column;
  }

  .panel-actions,
  .suggest-form div {
    grid-template-columns: 1fr;
    display: grid;
  }

  .plain-btn,
  .share-btn,
  .suggest-form .dark-btn {
    width: 100%;
  }

  .input-panel,
  .results-panel,
  .calculator-title-row {
    padding-left: 18px;
    padding-right: 18px;
  }
}