/* Design tokens — design/silvertek/scenes/system-A.json («Прокатний цех»). Every rule uses these. */
@font-face {
  font-family: "Roboto";
  src: url("../assets/fonts/Roboto.ttf") format("truetype");
  font-weight: 100 900;
  font-display: swap;
}

@font-face {
  font-family: "Inter";
  src: url("../assets/fonts/Inter.ttf") format("truetype");
  font-weight: 100 900;
  font-display: swap;
}

:root {
  --color-accent: #ff6a13;
  --color-accent-hover: #ff8438;
  --color-accent-pressed: #e05e0a;
  --color-bg-canvas: #121416;
  --color-bg-surface: #1a1d20;
  --color-bg-inverse: #d7dbde;
  --color-text-primary: #f2f4f5;
  --color-text-secondary: #98a1a8;
  --color-text-on-accent: #121416;
  --color-text-on-inverse: #121416;
  --color-border-default: #656e75;
  --color-border-strong: #7a838a;
  --color-border-subtle: #2e3338;
  --color-focus: #ffffff;
  --color-error: #ff5449;
  --color-error-text: #ff8a80;
  --color-success: #3ed598;
  --color-state-hover: #22262a;
  --color-state-pressed: #2e3338;

  --font-display: "Roboto", "Arial Narrow", sans-serif;
  --font-body: "Inter", system-ui, sans-serif;

  --border-hairline: 1px;
  --focus-ring: 2px;
  --icon-size: 24px;
  --icon-stroke: 1.5;

  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 40px;
  --space-6: 48px;
  --space-8: 64px;
  --space-10: 80px;
  --space-12: 96px;
  --space-15: 120px;

  --section-padding: 64px;
  --page-gutter: 24px;
  --page-max: 1440px;
  --control-md: 48px;
  --control-lg: 56px;
  --field-h: 56px;
  --field-w: 480px;
  --header-h: 72px;
  --tap-target: 44px;

  --text-hero: 900 40px/42px var(--font-display);
  --text-section: 900 30px/35px var(--font-display);
  --text-display: 900 48px/52px var(--font-display);
  --text-card: 700 19px/24px var(--font-display);
  --text-body-lg: 400 17px/26px var(--font-body);
  --text-body: 400 16px/24px var(--font-body);
  --text-label: 600 15px/20px var(--font-body);
  --text-label-lg: 600 17px/24px var(--font-body);
  --text-caption: 500 13px/18px var(--font-body);
}

@media (min-width: 900px) {
  :root {
    --section-padding: 120px;
    --page-gutter: 80px;
    --header-h: 96px;
    --text-hero: 900 64px/67px var(--font-display);
    --text-section: 900 44px/51px var(--font-display);
    --text-card: 700 22px/28px var(--font-display);
    --text-body-lg: 400 19px/28px var(--font-body);
  }
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-h);
}

body {
  margin: 0;
  background: var(--color-bg-canvas);
  color: var(--color-text-primary);
  font: var(--text-body);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, p, ul, ol {
  margin: 0;
}

ul, ol {
  padding: 0;
  list-style: none;
}

a {
  color: inherit;
}

:focus-visible {
  outline: var(--focus-ring) solid var(--color-focus);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  left: var(--space-2);
  top: -100px;
  z-index: 100;
  padding: var(--space-1) var(--space-2);
  background: var(--color-accent);
  color: var(--color-text-on-accent);
  font: var(--text-label);
}

.skip-link:focus {
  top: var(--space-2);
}

.container {
  width: 100%;
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 0 var(--page-gutter);
}

.icon {
  width: var(--icon-size);
  height: var(--icon-size);
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: var(--icon-stroke);
  stroke-linecap: round;
  stroke-linejoin: round;
}

.icon--accent {
  color: var(--color-accent);
}

.icon--success {
  color: var(--color-success);
  width: var(--space-6);
  height: var(--space-6);
}

/* ---------- wordmark, navigation ---------- */

.wordmark {
  font: var(--text-card);
  text-transform: uppercase;
  letter-spacing: 0.01em;
  text-decoration: none;
  color: var(--color-text-primary);
}

.nav__item {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: var(--tap-target);
  font: var(--text-label);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--color-text-secondary);
  transition: color 0.15s;
}

.nav__item:hover {
  color: var(--color-text-primary);
}

.nav__item.is-current {
  color: var(--color-accent);
}

.nav__item.is-current::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 4px;
  height: var(--focus-ring);
  background: var(--color-accent);
}

/* ---------- buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 var(--space-3);
  border: var(--border-hairline) solid transparent;
  border-radius: 0;
  font: var(--text-label);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.15s, border-color 0.15s, color 0.15s;
}

.btn--md {
  min-height: var(--control-md);
}

.btn--lg {
  min-height: var(--control-lg);
  padding: 0 var(--space-4);
  font: var(--text-label-lg);
  letter-spacing: 0.04em;
}

.btn--block {
  width: 100%;
}

.btn--primary {
  background: var(--color-accent);
  color: var(--color-text-on-accent);
}

.btn--primary:hover {
  background: var(--color-accent-hover);
}

.btn--primary:active {
  background: var(--color-accent-pressed);
}

.btn--secondary {
  background: var(--color-bg-canvas);
  border-color: var(--color-border-strong);
  color: var(--color-text-primary);
}

.btn--secondary:hover {
  background: var(--color-state-hover);
}

.btn--secondary:active {
  background: var(--color-state-pressed);
}

.btn--dark {
  background: var(--color-bg-canvas);
  color: var(--color-text-primary);
}

.btn--dark:hover {
  background: var(--color-state-pressed);
}

.btn--dark:focus-visible {
  outline-color: var(--color-bg-canvas);
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--tap-target);
  height: var(--tap-target);
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--color-text-primary);
  cursor: pointer;
}

.icon-btn:hover {
  background: var(--color-state-hover);
}

/* ---------- header ---------- */

.header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--color-bg-canvas);
  border-bottom: var(--border-hairline) solid var(--color-border-subtle);
}

.header__inner {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  height: var(--header-h);
}

.header .nav {
  display: none;
  gap: var(--space-3);
  margin-right: auto;
}

.header__cta {
  display: none;
}

.header__burger {
  margin-left: auto;
}

@media (min-width: 1100px) {
  .header .nav {
    display: flex;
  }

  .header__cta {
    display: inline-flex;
  }

  .header__burger {
    display: none;
  }

  .header .wordmark {
    margin-right: var(--space-4);
  }
}

/* ---------- mobile menu ---------- */

.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: flex;
  flex-direction: column;
  background: var(--color-bg-canvas);
}

.mobile-menu[hidden] {
  display: none;
}

.mobile-menu__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  border-bottom: var(--border-hairline) solid var(--color-border-subtle);
}

.mobile-menu__nav {
  display: flex;
  flex-direction: column;
  padding-top: var(--space-3);
  padding-bottom: var(--space-3);
}

.mobile-menu__nav .nav__item {
  min-height: var(--space-8);
  border-bottom: var(--border-hairline) solid var(--color-border-subtle);
  font: var(--text-card);
  text-transform: uppercase;
}

.mobile-menu__nav .nav__item.is-current::after {
  bottom: -1px;
}

.mobile-menu__bottom {
  margin-top: auto;
  padding-bottom: var(--space-3);
}

body.menu-open {
  overflow: hidden;
}

/* ---------- hero ---------- */

.hero {
  position: relative;
  overflow: hidden;
  border-bottom: var(--border-hairline) solid var(--color-border-subtle);
}

.hero__media {
  position: relative;
  height: 220px;
  border-bottom: var(--focus-ring) solid var(--color-accent);
}

.hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.85) contrast(1.05);
}

.hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(18, 20, 22, 0) 40%, rgba(18, 20, 22, 0.7) 100%);
}

.hero__inner {
  position: relative;
  padding-top: var(--space-6);
  padding-bottom: var(--space-8);
}

.hero__title {
  max-width: 14ch;
  font: var(--text-hero);
  letter-spacing: -0.01em;
  text-transform: uppercase;
}

.hero__lead {
  max-width: 560px;
  margin-top: var(--space-3);
  font: var(--text-body-lg);
  color: var(--color-text-secondary);
}

.hero__actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-top: var(--space-5);
}

@media (min-width: 900px) {
  .hero__media {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    width: 46%;
    height: auto;
    border-bottom: 0;
    border-left: var(--focus-ring) solid var(--color-accent);
  }

  .hero__media::after {
    background: linear-gradient(90deg, rgba(18, 20, 22, 0.55) 0%, rgba(18, 20, 22, 0) 45%);
  }

  .hero__inner {
    padding-top: var(--space-15);
    padding-bottom: var(--space-15);
  }

  .hero__title,
  .hero__lead {
    max-width: 52%;
  }

  .hero__actions {
    flex-direction: row;
    gap: var(--space-2);
  }
}

/* ---------- sections ---------- */

.section {
  padding: var(--section-padding) 0;
  border-bottom: var(--border-hairline) solid var(--color-border-subtle);
}

.section--surface {
  background: var(--color-bg-surface);
}

.section--inverse {
  background: var(--color-bg-inverse);
  color: var(--color-text-on-inverse);
}

.section__title {
  font: var(--text-section);
  letter-spacing: -0.005em;
  text-transform: uppercase;
  margin-bottom: var(--space-6);
}

/* features */

.features {
  display: grid;
  gap: var(--space-3);
}

.feature {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  padding-top: var(--space-3);
  border-top: var(--border-hairline) solid var(--color-border-default);
}

.feature__title {
  font: var(--text-card);
  letter-spacing: 0.01em;
  text-transform: uppercase;
  margin-bottom: var(--space-1);
}

.feature__text {
  color: var(--color-text-secondary);
}

@media (min-width: 900px) {
  .features {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-4);
  }
}

/* category cards — not interactive */

.cards {
  display: grid;
  gap: var(--space-2);
}

.card {
  display: flex;
  flex-direction: column;
  background: var(--color-bg-canvas);
  border: var(--border-hairline) solid var(--color-border-subtle);
}

.card__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-bottom: var(--focus-ring) solid var(--color-accent);
}

.card__body {
  padding: var(--space-3) var(--space-3) var(--space-4);
}

.card__title {
  font: var(--text-card);
  letter-spacing: 0.01em;
  text-transform: uppercase;
  margin-bottom: var(--space-1);
}

.card__text {
  color: var(--color-text-secondary);
}

@media (min-width: 900px) {
  .cards {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-3);
  }
}

/* scrap — the one light plate */

.scrap {
  display: grid;
  gap: var(--space-4);
}

.scrap__title {
  font: var(--text-display);
  text-transform: uppercase;
  letter-spacing: -0.01em;
}

.scrap__body {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-3);
}

.scrap__text {
  font: var(--text-body-lg);
  max-width: 520px;
}

.scrap .btn {
  width: 100%;
  margin-top: var(--space-2);
}

.scrap__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

@media (min-width: 900px) {
  .scrap {
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: var(--space-8);
  }

  .scrap .btn {
    width: auto;
  }
}

/* about */

.about {
  display: grid;
  gap: var(--space-5);
}

.about__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  filter: grayscale(1);
}

.about__body .section__title {
  margin-bottom: var(--space-3);
}

.about__text {
  font: var(--text-body-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
  max-width: 560px;
}

.about__facts {
  display: grid;
  gap: 0;
  margin: var(--space-4) 0 0;
}

.about__facts div {
  display: flex;
  justify-content: space-between;
  gap: var(--space-2);
  padding: var(--space-2) 0;
  border-top: var(--border-hairline) solid var(--color-border-subtle);
}

.about__facts dt {
  font: var(--text-label);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
}

.about__facts dd {
  margin: 0;
  text-align: right;
}

@media (min-width: 900px) {
  .about {
    grid-template-columns: 5fr 7fr;
    align-items: center;
    gap: var(--space-10);
  }

  .about__img {
    aspect-ratio: 4 / 5;
  }
}

/* steps */

.steps {
  display: grid;
  gap: var(--space-4);
}

.step {
  padding-top: var(--space-3);
  border-top: var(--border-hairline) solid var(--color-border-default);
}

.step__num {
  display: block;
  font: var(--text-display);
  color: var(--color-accent);
  margin-bottom: var(--space-2);
}

.step__title {
  font: var(--text-card);
  text-transform: uppercase;
  letter-spacing: 0.01em;
  margin-bottom: var(--space-1);
}

.step__text {
  color: var(--color-text-secondary);
}

@media (min-width: 900px) {
  .steps {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ---------- form ---------- */

.form,
.success {
  max-width: 640px;
}

.field {
  margin: 0 0 var(--space-3);
  padding: 0;
  border: 0;
  min-width: 0;
}

.field__label {
  display: block;
  margin-bottom: var(--space-1);
  padding: 0;
  font: var(--text-label);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-text-primary);
}

.field__req {
  color: var(--color-accent);
}

.field__opt {
  margin-left: var(--space-1);
  font: var(--text-caption);
  text-transform: none;
  letter-spacing: 0;
  color: var(--color-text-secondary);
}

.input {
  display: block;
  width: 100%;
  height: var(--field-h);
  padding: 0 var(--space-2);
  background: var(--color-bg-canvas);
  border: var(--border-hairline) solid var(--color-border-default);
  border-radius: 0;
  color: var(--color-text-primary);
  font: var(--text-body);
}

.input::placeholder {
  color: var(--color-text-secondary);
}

.input:hover {
  border-color: var(--color-border-strong);
}

.input:focus-visible {
  outline-offset: 0;
  border-color: var(--color-focus);
}

.input--textarea {
  height: auto;
  min-height: 144px;
  padding: var(--space-2);
  resize: vertical;
}

.field.has-error .input {
  border-color: var(--color-error);
}

.field__error {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  margin-top: var(--space-1);
  font: var(--text-caption);
  color: var(--color-error-text);
}

.field__error::before {
  content: "!";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  flex: none;
  border: var(--border-hairline) solid currentColor;
  border-radius: 50%;
  font-weight: 700;
}

.field__error[hidden] {
  display: none;
}

.radio-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.radio,
.checkbox {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-height: var(--tap-target);
  cursor: pointer;
}

.radio input,
.checkbox input {
  position: absolute;
  opacity: 0;
  width: 1px;
  height: 1px;
}

.radio__box,
.checkbox__box {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  flex: none;
  border: var(--border-hairline) solid var(--color-border-strong);
  background: var(--color-bg-canvas);
}

.radio__box {
  border-radius: 50%;
}

.radio input:checked + .radio__box {
  border-color: var(--color-accent);
}

.radio input:checked + .radio__box::after {
  content: "";
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-accent);
}

.checkbox__box svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: var(--color-text-on-accent);
  stroke-width: 3;
  visibility: hidden;
}

.checkbox input:checked + .checkbox__box {
  background: var(--color-accent);
  border-color: var(--color-accent);
}

.checkbox input:checked + .checkbox__box svg {
  visibility: visible;
}

.radio input:focus-visible + .radio__box,
.checkbox input:focus-visible + .checkbox__box {
  outline: var(--focus-ring) solid var(--color-focus);
  outline-offset: 2px;
}

.field.has-error .checkbox__box {
  border-color: var(--color-error);
}

.form__actions .btn {
  width: 100%;
}

@media (min-width: 900px) {
  .radio-group {
    flex-direction: row;
    gap: var(--space-4);
  }

  .form__actions {
    display: flex;
    justify-content: flex-end;
  }

  .form__actions .btn {
    width: auto;
  }
}

.success {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-2);
  padding: var(--space-5);
  background: var(--color-bg-canvas);
  border: var(--border-hairline) solid var(--color-border-subtle);
  border-left: var(--focus-ring) solid var(--color-success);
}

.success[hidden] {
  display: none;
}

.success__title {
  font: var(--text-section);
  text-transform: uppercase;
}

.success__text {
  font: var(--text-body-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
}

/* ---------- footer ---------- */

.footer {
  padding: var(--space-8) 0 var(--space-4);
}

.footer__inner {
  display: grid;
  gap: var(--space-5);
}

.footer__title {
  font: var(--text-label);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
}

.footer__legal {
  font: var(--text-body);
  margin-bottom: var(--space-2);
}

.footer__link {
  display: inline-flex;
  align-items: center;
  min-height: var(--tap-target);
  font: var(--text-label);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-accent);
  text-underline-offset: 4px;
}

.footer__nav {
  display: flex;
  flex-direction: column;
}

.footer__bottom {
  margin-top: var(--space-6);
  padding-top: var(--space-3);
  border-top: var(--border-hairline) solid var(--color-border-subtle);
  font: var(--text-caption);
  color: var(--color-text-secondary);
}

@media (min-width: 900px) {
  .footer__inner {
    grid-template-columns: 1fr 1fr 1fr;
  }
}

/* ---------- mobile sticky action bar ---------- */

.sticky-bar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 15;
  padding: var(--space-1) var(--page-gutter) calc(var(--space-1) + env(safe-area-inset-bottom));
  background: var(--color-bg-canvas);
  border-top: var(--border-hairline) solid var(--color-border-subtle);
}

.sticky-bar[hidden] {
  display: none;
}

@media (min-width: 1100px) {
  .sticky-bar {
    display: none;
  }
}

@media (max-width: 1099px) {
  body.has-sticky {
    padding-bottom: calc(var(--control-lg) + var(--space-2));
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  * {
    transition: none !important;
  }
}