/**
 * Страница «Калькулятор» — оформление в стиле темы БИРАГРО.
 */

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

.hidden {
  display: none !important;
}

.text-lead {
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--color-text);
  margin: 0;
}

.page-main-calculator {
  overflow-x: hidden;
  background: var(--color-bg);
}

.page-calculator .header {
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
}

/* Hero */
.calc-page-hero {
  position: relative;
  padding: calc(var(--header-height) + 2.5rem) 0 3.5rem;
  background: linear-gradient(165deg, var(--color-darker) 0%, var(--color-dark) 45%, #2d4a35 100%);
  color: #fff;
  overflow: hidden;
}

.calc-page-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 10% 20%, rgba(210, 240, 115, 0.18) 0%, transparent 55%),
    radial-gradient(circle at 90% 80%, rgba(210, 240, 115, 0.1) 0%, transparent 40%);
  pointer-events: none;
}

.calc-page-hero .container {
  position: relative;
  z-index: 1;
}

.calc-page-hero__grid {
  display: grid;
  gap: 2.5rem;
  align-items: center;
}

@media (min-width: 960px) {
  .calc-page-hero__grid {
    grid-template-columns: 1.35fr 1fr;
    gap: 3rem;
  }
}

.calc-page-hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 1rem;
  background: rgba(210, 240, 115, 0.15);
  border: 1px solid rgba(210, 240, 115, 0.35);
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1.25rem;
  color: rgba(255, 255, 255, 0.95);
}

.calc-page-hero__badge i {
  color: var(--color-primary);
}

.calc-page-hero__title {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 1.25rem;
}

.calc-page-hero__title-line {
  display: block;
  margin-bottom: 0.35rem;
}

.calc-page-hero__accent {
  display: inline-block;
  color: var(--color-primary);
}

.calc-page-hero__accent.highlight-italic::after {
  background: var(--color-primary);
  opacity: 0.5;
}

.calc-page-hero__desc {
  font-size: 1.1rem;
  line-height: 1.65;
  color: rgba(255, 255, 255, 0.82);
  max-width: 40rem;
  margin-bottom: 2rem;
}

.calc-page-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.75rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

.calc-page-hero__meta-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.88);
}

.calc-page-hero__meta-item i {
  color: var(--color-primary);
  font-size: 1rem;
}

.calc-page-hero__visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.calc-page-hero__figure {
  width: min(15rem, 100%);
  aspect-ratio: 1;
  border-radius: var(--border-radius-xl);
  background: linear-gradient(145deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-darker);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 1.5rem;
  box-shadow:
    0 24px 48px rgba(0, 0, 0, 0.25),
    0 0 0 1px rgba(255, 255, 255, 0.25) inset;
  transform: rotate(-3deg);
  transition: transform var(--transition);
}

.calc-page-hero__figure:hover {
  transform: rotate(0deg);
}

.calc-page-hero__figure-num {
  font-size: clamp(2.75rem, 8vw, 4rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.04em;
}

.calc-page-hero__figure-label {
  font-size: 0.95rem;
  font-weight: 700;
  margin-top: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  opacity: 0.9;
}

/* Блок калькулятора — без «наезда» на тёмный герой: отступ сверху и свой фон */
.calc-page-section {
  position: relative;
  z-index: 1;
  margin-top: 0;
  padding-top: 2.5rem;
  padding-bottom: 3.5rem;
  background: var(--color-bg);
}

.calc-widget {
  background: var(--color-surface);
  border-radius: var(--border-radius-lg);
  border: 1px solid rgba(32, 54, 32, 0.08);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  max-width: 100%;
  min-width: 0;
}

.calc-widget *,
.calc-widget *::before,
.calc-widget *::after {
  box-sizing: border-box;
}

.calc-widget::before {
  content: "";
  display: block;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-dark) 100%);
}

.calc-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-bottom: 1px solid rgba(32, 54, 32, 0.08);
}

.calc-tab {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 1.25rem 0.75rem;
  font-size: 0.8rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: color var(--transition), background var(--transition);
  text-align: center;
  line-height: 1.25;
  min-height: 3.5rem;
}

@media (min-width: 640px) {
  .calc-tab {
    font-size: 0.95rem;
    padding: 1.5rem 1rem;
  }
}

.calc-tab i {
  font-size: 1.1rem;
  opacity: 0.85;
}

.calc-tab:hover {
  color: var(--color-text);
  background: var(--color-bg);
}

.calc-tab.active {
  color: var(--color-dark);
  background: var(--color-bg);
  box-shadow: inset 0 -3px 0 var(--color-primary);
}

.calc-body {
  padding: 1.5rem;
}

@media (min-width: 768px) {
  .calc-body {
    padding: 2rem 2.25rem;
  }
}

.calc-field {
  margin-bottom: 1.5rem;
}

.calc-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  margin-bottom: 0.65rem;
}

.calc-label-note {
  font-weight: 600;
  text-transform: none;
  letter-spacing: 0;
  opacity: 0.75;
}

.calc-material-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  margin: 0 -0.15rem;
  padding-bottom: 0.15rem;
}

@media (max-width: 520px) {
  .calc-material-tabs {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    padding-bottom: 0.35rem;
  }

  .calc-material-tab {
    flex-shrink: 0;
  }
}

.calc-material-tab {
  padding: 0.5rem 0.9rem;
  border-radius: 100px;
  border: 1px solid rgba(32, 54, 32, 0.12);
  background: var(--color-bg);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  transition: var(--transition);
}

.calc-material-tab:hover {
  border-color: var(--color-primary-dark);
}

.calc-material-tab.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-darker);
}

.calc-presets {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 132px), 1fr));
  gap: 0.5rem;
}

@media (max-width: 419px) {
  .calc-presets {
    grid-template-columns: repeat(2, 1fr);
  }
}

.calc-preset-btn {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.2rem;
  padding: 0.65rem 0.85rem;
  border-radius: var(--border-radius-sm);
  border: 1px solid rgba(32, 54, 32, 0.1);
  background: var(--color-surface);
  cursor: pointer;
  text-align: left;
  transition: var(--transition);
  font-family: inherit;
}

.calc-preset-btn:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.calc-preset-btn.active {
  border-color: var(--color-primary);
  background: rgba(210, 240, 115, 0.2);
}

.calc-preset-btn__size {
  font-size: 0.8rem;
  font-weight: 800;
  color: var(--color-dark);
}

.calc-preset-btn__label {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

.calc-dims {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  align-items: end;
}

@media (min-width: 720px) {
  .calc-dims {
    grid-template-columns: 1fr minmax(1.25rem, auto) 1fr minmax(1.25rem, auto) 1fr;
    gap: 0.35rem 0.25rem;
  }
}

.calc-input-group {
  min-width: 0;
  width: 100%;
}

.calc-input-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-muted);
  margin-bottom: 0.35rem;
}

.calc-input-wrap {
  position: relative;
  display: flex;
  align-items: center;
  width: 100%;
}

/* Поля только в виджете: без глобального .form-control (иначе едут суффиксы мм / м) */
.calc-widget .calc-input {
  display: block;
  width: 100%;
  max-width: 100%;
  margin: 0;
  padding: 0.8125rem 2.75rem 0.8125rem 1rem;
  border: 1.5px solid rgba(32, 54, 32, 0.14);
  border-radius: var(--border-radius-sm);
  background: var(--color-bg);
  font-family: var(--font-main);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.3;
  min-height: 3rem;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
  -moz-appearance: textfield;
  appearance: textfield;
}

.calc-widget .calc-input::-webkit-outer-spin-button,
.calc-widget .calc-input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.calc-widget .calc-input:hover {
  border-color: rgba(32, 54, 32, 0.22);
}

.calc-widget .calc-input:focus {
  outline: none;
  border-color: var(--color-primary);
  background: var(--color-surface);
  box-shadow: 0 0 0 3px rgba(210, 240, 115, 0.28);
}

.calc-widget .calc-input-wrap--big .calc-input--big {
  min-height: 3.5rem;
  padding: 0.9rem 3.5rem 0.9rem 1.1rem;
  font-size: clamp(1.1rem, 3vw, 1.35rem);
  font-weight: 700;
}

.calc-input-suffix {
  position: absolute;
  right: 0.85rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-text-muted);
  pointer-events: none;
  line-height: 1;
}

.calc-input-suffix--big {
  font-size: 0.95rem;
  right: 1rem;
}

.calc-input-sep {
  display: none;
  font-weight: 800;
  color: var(--color-text-muted);
  line-height: 1;
  user-select: none;
}

@media (min-width: 720px) {
  .calc-input-sep {
    display: flex;
    align-items: center;
    justify-content: center;
    padding-bottom: 0.55rem;
    font-size: 1.15rem;
  }
}

.calc-results {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(32, 54, 32, 0.08);
}

.calc-result-main {
  text-align: center;
  margin-bottom: 1.5rem;
}

.calc-result-main__label {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}

.calc-result-main__value {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.calc-result-main__value span:first-child {
  font-size: clamp(2.5rem, 8vw, 3.75rem);
  font-weight: 800;
  line-height: 1;
  color: var(--color-dark);
  letter-spacing: -0.02em;
}

.calc-result-main__unit {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text-muted);
}

.calc-result-main__sub {
  margin-top: 0.75rem;
  font-size: 0.95rem;
  color: var(--color-text-muted);
  max-width: 36rem;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.5;
}

.calc-result-grid {
  display: grid;
  gap: 0.75rem;
}

@media (min-width: 768px) {
  .calc-result-grid--3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 767px) {
  .calc-result-grid--3 {
    grid-template-columns: 1fr;
  }
}

.calc-result-card {
  background: var(--color-bg);
  border-radius: var(--border-radius-md);
  padding: 1.1rem 1rem;
  border: 1px solid rgba(32, 54, 32, 0.06);
  transition: var(--transition);
}

.calc-result-card:hover {
  border-color: rgba(210, 240, 115, 0.5);
  box-shadow: var(--shadow-sm);
}

.calc-result-card__icon {
  width: 40px;
  height: 40px;
  border-radius: var(--border-radius-sm);
  background: var(--color-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.6rem;
  color: var(--color-dark);
  box-shadow: var(--shadow-sm);
}

.calc-result-card__label {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
  margin-bottom: 0.35rem;
}

.calc-result-card__value {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--color-dark);
}

.calc-cta {
  margin-top: 2rem;
  padding: 1.5rem;
  border-radius: var(--border-radius-md);
  background: linear-gradient(135deg, rgba(210, 240, 115, 0.25) 0%, rgba(210, 240, 115, 0.08) 100%);
  border: 1px solid rgba(210, 240, 115, 0.4);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  align-items: stretch;
}

@media (min-width: 768px) {
  .calc-cta {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: 1.75rem 2rem;
  }
}

.calc-cta__title {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 0.35rem;
  color: var(--color-dark);
}

.calc-cta__desc {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.5;
  margin: 0;
  max-width: 36rem;
}

.calc-cta__btn {
  flex-shrink: 0;
  white-space: nowrap;
}

/*
 * «Зачем калькулятор доски» и «Как считается объём»:
 * в style.css у .benefits задано padding-top: 0 — из-за этого контент при section-padding
 * визуально «липнет» к верху, а снизу остаётся лишний воздух. Задаём симметричные поля.
 */
#calc-benefits.section-padding,
.calc-formula-section.section-padding {
  padding-top: 5.5rem;
  padding-bottom: 5.5rem;
}

@media (max-width: 768px) {
  #calc-benefits.section-padding,
  .calc-formula-section.section-padding {
    padding-top: 3rem;
    padding-bottom: 3rem;
  }
}

.calc-formula-grid {
  display: grid;
  gap: 2rem;
}

@media (min-width: 960px) {
  .calc-formula-grid {
    grid-template-columns: 1.2fr 0.9fr;
    align-items: start;
    gap: 3rem;
  }
}

.text-lead--formula em {
  font-style: italic;
}

.calc-formula-card {
  margin: 1.5rem 0;
  background: var(--color-surface);
  border-radius: var(--border-radius-md);
  border: 1px solid rgba(32, 54, 32, 0.08);
  overflow: hidden;
}

.calc-formula-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem 1rem;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid rgba(32, 54, 32, 0.06);
}

.calc-formula-row:last-child {
  border-bottom: none;
}

.calc-formula-label {
  font-weight: 700;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.calc-formula-eq {
  font-weight: 800;
  color: var(--color-dark);
  font-variant-numeric: tabular-nums;
}

.calc-formula-note {
  font-size: 0.9rem;
  line-height: 1.55;
}

.calc-example-card {
  background: var(--color-dark);
  color: #fff;
  border-radius: var(--border-radius-lg);
  padding: 2rem;
  position: relative;
  overflow: hidden;
}

.calc-example-card::before {
  content: "";
  position: absolute;
  top: -40%;
  right: -20%;
  width: 60%;
  height: 80%;
  background: radial-gradient(circle, rgba(210, 240, 115, 0.2) 0%, transparent 70%);
  pointer-events: none;
}

.calc-example-card__title {
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  opacity: 0.7;
  margin-bottom: 0.5rem;
}

.calc-example-card__size {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 1.25rem;
  position: relative;
}

.calc-example-list {
  list-style: none;
  padding: 0;
  margin: 0;
  position: relative;
}

.calc-example-list li {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.65rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  font-size: 0.9rem;
}

.calc-example-list li:last-child {
  border-bottom: none;
}

.calc-example-list li span {
  opacity: 0.85;
}

.calc-example-list li strong {
  font-weight: 800;
  text-align: right;
}

/* Modal */
.calc-modal-box {
  max-width: 480px;
  width: 100%;
  max-height: min(90vh, 880px);
  overflow-y: auto;
}

.calc-modal-inner {
  padding-right: 0.25rem;
}

#calcModal.modal-overlay {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.calc-modal-summary {
  background: var(--color-bg);
  border-radius: var(--border-radius-md);
  padding: 1rem 1.15rem;
  margin-bottom: 1.5rem;
  border: 1px solid rgba(32, 54, 32, 0.08);
}

.calc-modal-summary__row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.45rem 0;
  font-size: 0.875rem;
}

.calc-modal-summary__row span {
  color: var(--color-text-muted);
}

.calc-modal-summary__row strong {
  font-weight: 800;
  color: var(--color-dark);
  text-align: right;
}

/* SEO-блок под FAQ: без лишнего «воздуха» перед футером */
.calc-seo-section.section-padding {
  padding-top: 4rem;
  padding-bottom: 3rem;
}

@media (max-width: 768px) {
  .calc-seo-section.section-padding {
    padding-top: 2.5rem;
    padding-bottom: 2rem;
  }
}

.calc-seo-block p {
  margin-bottom: 0.85rem;
  line-height: 1.65;
}

.calc-seo-block p:last-child {
  margin-bottom: 0;
}

.page-calculator .border-card {
  border: 1px solid rgba(32, 54, 32, 0.08);
}

@media (max-width: 600px) {
  .calc-page-hero {
    padding-top: calc(var(--header-height) + 1.5rem);
    padding-bottom: 2.75rem;
  }

  .calc-page-section {
    padding-top: 1.75rem;
  }

  .calc-tab {
    flex-direction: column;
    gap: 0.35rem;
    padding-left: 0.5rem;
    padding-right: 0.5rem;
    min-height: 4rem;
  }

  .calc-tab i {
    font-size: 1rem;
  }

  .calc-cta__btn {
    width: 100%;
    justify-content: center;
  }

  .calc-page-hero__figure {
    transform: rotate(-2deg);
    max-width: 13rem;
    margin: 0 auto;
  }
}