/* ==========================================================================
   TORHOVYI DIM TESKOM TOV — tech-precision
   Oxford field, steel grid, azure tech zones, amber living zones.
   ========================================================================== */

:root {
  --bg: #0b1c33;
  --bg-alt: #10243f;
  --bg-deep: #071426;
  --ink: #e8eef5;
  --ink-soft: #9aa6b4;
  --ink-invert: #e8eef5;
  --accent: #2ec4f0;
  --accent-soft: #14344a;
  --amber: #e0a15a;
  --face: #1a3d66;
  --face-dim: #122c4c;
  --line: rgba(154, 166, 180, 0.32);
  --on-accent: #041018;
  --font-display: "Space Grotesk", "Avenir Next", "Segoe UI", sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --tracking-display: -0.035em;
  --radius: 0px;
  --radius-lg: 0px;
  --shadow: 0 18px 40px rgba(0, 0, 0, 0.32);
}

body {
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 56px 56px;
  background-position: center top;
}

.idx {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.08em;
  color: var(--accent);
}

.site-header {
  background: color-mix(in srgb, var(--bg) 86%, transparent);
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  line-height: 1.2;
}

.site-header__brand img {
  width: 36px;
  height: 36px;
  flex: none;
}

.nav a {
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-size: 0.72rem;
}

.section-head {
  max-width: 40rem;
  margin-bottom: clamp(1.75rem, 3vw, 2.75rem);
}

.section-head h2 {
  margin-top: 0.4rem;
}

.section-head .lede {
  margin-top: 0.8rem;
}

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

.btn--ghost:hover {
  background: var(--ink);
  color: var(--bg);
}

/* --- HERO --- */
.hero {
  padding-top: clamp(2rem, 4vw, 3.5rem);
}

.hero__grid {
  display: grid;
  gap: var(--gap);
  align-items: end;
}

.hero h1 {
  margin: 0.45rem 0 1rem;
  max-width: 14ch;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.hero__photo img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border: 1px solid var(--line);
}

.hero__photo figcaption {
  margin-top: 0.55rem;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--ink-soft);
}

.spec-strip {
  display: grid;
  margin-top: clamp(1.5rem, 3vw, 2.5rem);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.spec-strip div {
  padding: 1rem 0;
  border-bottom: 1px solid var(--line);
}

.spec-strip dt {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--amber);
}

.spec-strip dd {
  margin-top: 0.25rem;
}

/* --- LINES --- */
.line-list {
  list-style: none;
  padding: 0;
  border-bottom: 1px solid var(--line);
}

.line {
  display: grid;
  grid-template-columns: 3.2rem 1fr;
  gap: 0.8rem;
  padding: 1.35rem 0;
  border-top: 1px solid var(--line);
}

.line h3 {
  font-size: var(--step-1);
  margin-bottom: 0.45rem;
}

/* --- SYNERGY --- */
.synergy {
  display: grid;
  gap: var(--gap);
}

.synergy__col {
  padding: 1.25rem;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg-alt) 80%, transparent);
}

.synergy__col--azure {
  border-top: 3px solid var(--accent);
}

.synergy__col--amber {
  border-top: 3px solid var(--amber);
}

.synergy__col--amber .idx {
  color: var(--amber);
}

.synergy__col h3 {
  margin: 0.35rem 0 0.8rem;
}

.synergy__note {
  margin-top: var(--gap);
  max-width: 46rem;
  color: var(--ink-soft);
}

/* --- ROOMS --- */
.rooms {
  display: grid;
  gap: 0.75rem;
}

.rooms img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  border: 1px solid var(--line);
}

.rooms figcaption {
  display: flex;
  gap: 0.6rem;
  align-items: baseline;
  margin-top: 0.45rem;
  font-size: var(--step--1);
  color: var(--ink-soft);
}

/* --- COMPANY --- */
.company {
  display: grid;
  gap: var(--gap);
  align-items: start;
}

.company h2 {
  margin: 0.4rem 0 1rem;
}

.company__card {
  border: 1px solid var(--line);
  padding: 1.25rem;
  background: var(--bg-alt);
}

.company__name {
  font-family: var(--font-display);
  font-weight: 600;
  margin: 0.9rem 0 0.7rem;
}

.company__card ul {
  list-style: none;
  padding: 0;
  margin-bottom: 1.1rem;
}

.company__card li {
  padding: 0.4rem 0;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: var(--step--1);
}

/* --- SUPPLY --- */
.steps {
  list-style: none;
  padding: 0;
  display: grid;
  gap: var(--gap);
}

.steps h3 {
  margin: 0.4rem 0 0.45rem;
  font-size: var(--step-1);
}

/* --- COVER --- */
.cover {
  display: grid;
  gap: var(--gap);
  align-items: center;
}

.cover h2 {
  margin: 0.4rem 0 0.9rem;
}

.cover__span {
  display: grid;
  gap: 0.7rem;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.cover__span i {
  display: block;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--amber));
}

/* --- MATRIX --- */
.matrix {
  border: 1px solid var(--line);
  background: var(--bg-deep);
  padding: clamp(1rem, 2vw, 1.5rem);
}

.matrix__top {
  display: grid;
  gap: 1.25rem;
}

.tumblers {
  border: 0;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.55rem;
}

.tumblers legend {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 0.6rem;
}

.tumbler {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 0.75rem;
  align-items: center;
  padding: 0.7rem 0.75rem;
  border: 1px solid var(--line);
  cursor: pointer;
}

.tumbler input[type="checkbox"] {
  position: absolute;
  opacity: 0;
  width: 1px;
  height: 1px;
}

.tumbler__track {
  width: 44px;
  height: 24px;
  border: 1px solid var(--line);
  background: var(--bg);
  position: relative;
  flex: none;
}

.tumbler__track::after {
  content: "";
  position: absolute;
  top: 3px;
  left: 3px;
  width: 16px;
  height: 16px;
  background: var(--ink-soft);
  transition: transform 0.25s var(--ease), background-color 0.25s var(--ease);
}

.tumbler input:checked + .tumbler__track::after {
  transform: translateX(20px);
  background: var(--accent);
}

.tumbler[data-tone="amber"] input:checked + .tumbler__track::after {
  background: var(--amber);
}

.tumbler input:focus-visible + .tumbler__track {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.tumbler__copy {
  display: grid;
  gap: 0.15rem;
  min-width: 0;
}

.tumbler__copy strong {
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.3;
}

.tumbler__copy small {
  color: var(--ink-soft);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
}

.lots {
  display: grid;
  gap: 0.2rem;
  justify-items: end;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.lots input {
  width: 4.2rem;
  padding: 0.35rem 0.4rem;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--ink);
}

.lots input:disabled {
  opacity: 0.4;
}

.stage {
  min-width: 0;
}

.complex {
  width: 100%;
  height: auto;
  display: block;
}

.complex .shell {
  fill: var(--face-dim);
  stroke: var(--ink-soft);
  stroke-width: 1.25;
}

.complex .zone {
  fill: var(--face);
  stroke: var(--ink);
  stroke-width: 1.25;
  transition: fill 0.35s var(--ease), stroke 0.35s var(--ease);
}

.complex .zone[data-tone="azure"].is-lit {
  fill: color-mix(in srgb, var(--accent) 68%, var(--bg-deep));
  stroke: var(--accent);
}

.complex .zone[data-tone="amber"].is-lit {
  fill: color-mix(in srgb, var(--amber) 72%, var(--bg-deep));
  stroke: var(--amber);
}

.complex .mullion {
  fill: none;
  stroke: var(--ink);
  stroke-width: 1;
  opacity: 0.35;
  pointer-events: none;
}

.zone-key {
  list-style: none;
  padding: 0;
  margin-top: 0.6rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}

.zone-key li.is-lit[data-tone="azure"] {
  color: var(--accent);
}

.zone-key li.is-lit[data-tone="amber"] {
  color: var(--amber);
}

.brief {
  margin-top: 1.1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  min-height: 3.2rem;
}

.brief ol {
  margin: 0.6rem 0 0;
  padding-left: 1.2rem;
  display: grid;
  gap: 0.9rem;
}

.brief li ol {
  margin-top: 0.35rem;
  color: var(--ink-soft);
  font-size: var(--step--1);
}

.brief__note {
  margin-top: 0.9rem;
  color: var(--amber);
  font-size: var(--step--1);
}

.matrix > .btn {
  margin-top: 1rem;
}

/* --- CONTACT --- */
.contact-grid {
  display: grid;
  gap: var(--gap);
  margin-top: clamp(2rem, 4vw, 3rem);
}

.contact-grid h3 {
  margin-bottom: 0.7rem;
}

.contact-list {
  list-style: none;
  padding: 0;
  margin-top: 1rem;
}

.contact-list li {
  padding: 0.45rem 0;
  border-top: 1px solid var(--line);
}

.contact-form {
  display: grid;
  gap: 0.9rem;
  align-content: start;
}

.contact-form .grid {
  gap: 0.9rem;
}

/* --- FOOTER --- */
.footer-grid {
  display: grid;
  gap: var(--gap);
}

.footer-grid .site-header__brand {
  margin-bottom: 0.8rem;
}

.footer-grid nav {
  display: grid;
  gap: 0.35rem;
}

.footer-grid a {
  text-decoration: none;
}

.site-footer__bottom p {
  margin: 0;
}

/* --- BREAKPOINTS --- */
@media (min-width: 700px) {
  .spec-strip {
    grid-template-columns: 1fr 1fr;
  }

  .spec-strip div:nth-child(odd) {
    padding-right: 1.25rem;
  }

  .spec-strip div:nth-child(even) {
    padding-left: 1.25rem;
    border-left: 1px solid var(--line);
  }

  .spec-strip div:nth-child(-n + 2) {
    border-bottom: 1px solid var(--line);
  }

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

  .rooms__lead {
    grid-column: 1 / -1;
  }

  .rooms__lead img {
    height: 360px;
  }

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

  .footer-grid {
    grid-template-columns: 1.4fr 1fr 1fr;
  }

  .footer-grid nav {
    grid-column: 1 / -1;
    grid-template-columns: repeat(6, auto);
    justify-content: start;
    gap: 0.5rem 1.25rem;
  }
}

@media (min-width: 768px) {
  .hero__grid {
    grid-template-columns: 1fr 1fr;
  }

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

  .company {
    grid-template-columns: 1.4fr 0.8fr;
  }

  .cover {
    grid-template-columns: 1.3fr 0.7fr;
  }

  .contact-grid {
    grid-template-columns: 0.8fr 1.2fr;
  }
}

@media (min-width: 1100px) {
  .spec-strip {
    grid-template-columns: repeat(4, 1fr);
  }

  .spec-strip div {
    border-bottom: 0;
    padding: 1.1rem 1.1rem 1.1rem 0;
  }

  .spec-strip div + div {
    padding-left: 1.1rem;
    border-left: 1px solid var(--line);
  }

  .rooms {
    grid-template-columns: 1.3fr 1fr 1fr;
    grid-template-rows: auto auto;
  }

  .rooms__lead {
    grid-column: 1;
    grid-row: 1 / span 2;
  }

  .rooms__lead img,
  .rooms img {
    height: 100%;
    min-height: 220px;
  }

  .rooms__wide {
    grid-column: 2 / span 2;
  }

  .steps {
    grid-template-columns: repeat(4, 1fr);
  }

  .matrix__top {
    grid-template-columns: 0.92fr 1.08fr;
    align-items: center;
  }

  .footer-grid {
    grid-template-columns: 1.5fr 1fr 1fr auto;
  }

  .footer-grid nav {
    grid-column: auto;
    grid-template-columns: 1fr;
  }
}

@media (max-width: 420px) {
  .site-header__brand span {
    max-width: 9.5rem;
  }

  .tumbler {
    grid-template-columns: auto 1fr;
  }

  .lots {
    grid-column: 2;
    justify-items: start;
  }
}