/* ============================================================
   Techblock.top — single-page brand + contact
   Monochrome (black / white) theme, fully responsive
   ============================================================ */

:root {
  --bg: #050506;
  --panel: rgba(255, 255, 255, 0.045);
  --panel-brd: rgba(255, 255, 255, 0.14);
  --panel-brd-hi: rgba(255, 255, 255, 0.42);
  --ink: #f4f4f5;
  --ink-dim: #a6a6ac;
  --ink-faint: #8d8d95;
  --white: #ffffff;
  --black: #0a0a0b;
  --radius: 16px;
  --radius-sm: 11px;
  --maxw: 1160px;
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  overflow-x: hidden;
}

html {
  overflow-y: auto;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  display: flex;
  flex-direction: column;
  min-height: 100svh;
}

/* ---------- Global focus visibility ---------- */
:focus-visible {
  outline: 2px solid var(--white);
  outline-offset: 3px;
}

/* ---------- Skip link for keyboard users ---------- */
.skip {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 50;
  padding: 10px 14px;
  font-size: .85rem;
  font-weight: 700;
  color: var(--black);
  background: var(--white);
  border-radius: 8px;
  text-decoration: none;
  transform: translateY(-160%);
  transition: transform .18s ease;
}
.skip:focus,
.skip:focus-visible {
  transform: translateY(0);
}

/* ---------- Background ---------- */
.bg-layer {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  background: var(--bg);
}
.bg-layer img,
.bg-layer video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}
.bg-layer video { opacity: 1; }

.bg-overlay {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background:
    radial-gradient(ellipse 60% 50% at 78% 18%, rgba(255,255,255,.07), transparent 60%),
    linear-gradient(180deg, rgba(3,3,4,.72) 0%, rgba(3,3,4,.82) 45%, rgba(3,3,4,.94) 100%);
}

/* ---------- Layout shell ---------- */
.shell {
  position: relative;
  z-index: 2;
  flex: 1 0 auto;
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(18px, 3.4vw, 40px) clamp(18px, 4vw, 44px);
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(24px, 5vw, 72px);
  align-items: center;
}

/* ---------- Brand side ---------- */
.brand {
  max-width: 520px;
}

.brand-head {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.5vw, 20px);
}
.logo {
  width: clamp(56px, 8vw, 76px);
  height: clamp(56px, 8vw, 76px);
  object-fit: contain;
  display: block;
  /* keep the black mark visible on dark: render it white */
  filter: invert(1) brightness(1.15);
  opacity: .96;
}
.brand-name {
  margin: 0;
  font-size: clamp(2.1rem, 6vw, 3.6rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1;
  color: var(--white);
}

.tagline {
  margin: clamp(16px, 2.6vw, 24px) 0 0;
  font-size: clamp(1rem, 1.6vw, 1.16rem);
  color: var(--ink-dim);
  max-width: 46ch;
}

/* Social links */
.socials {
  margin-top: clamp(24px, 4vw, 40px);
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.social {
  display: flex;
  align-items: center;
  gap: 15px;
  padding: 14px 16px;
  border: 1px solid var(--panel-brd);
  border-radius: var(--radius-sm);
  background: var(--panel);
  color: var(--ink);
  text-decoration: none;
  backdrop-filter: blur(6px);
  transition: border-color .22s ease, background .22s ease, transform .22s ease;
}
.social:hover,
.social:focus-visible {
  border-color: var(--panel-brd-hi);
  background: rgba(255,255,255,.085);
  transform: translateY(-2px);
}
.social-ic {
  flex: 0 0 auto;
  width: 34px; height: 34px;
  display: grid;
  place-items: center;
  border: 1px solid var(--panel-brd);
  border-radius: 9px;
  color: var(--white);
}
.social-ic svg { width: 19px; height: 19px; }
.social-txt { display: flex; flex-direction: column; min-width: 0; }
.social-k { font-size: .82rem; font-weight: 700; letter-spacing: .04em; text-transform: uppercase; color: var(--ink-dim); }
.social-v { font-size: .98rem; color: var(--white); word-break: break-word; }

.micro {
  margin: 22px 0 0;
  font-size: .84rem;
  color: var(--ink-faint);
}

/* ---------- Contact card ---------- */
.contact { width: 100%; }
.card {
  border: 1px solid var(--panel-brd);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.025));
  backdrop-filter: blur(12px);
  box-shadow: 0 24px 70px rgba(0,0,0,.55);
  padding: clamp(20px, 3.2vw, 34px);
}
.card-title {
  margin: 0;
  font-size: clamp(1.3rem, 2.4vw, 1.6rem);
  font-weight: 700;
  letter-spacing: -0.015em;
  color: var(--white);
}
.card-sub {
  margin: 8px 0 22px;
  color: var(--ink-dim);
  font-size: .95rem;
}

.form { display: flex; flex-direction: column; gap: 15px; }
.row { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; }

.field { display: flex; flex-direction: column; gap: 7px; min-width: 0; }
.field label {
  font-size: .82rem;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--ink-dim);
}
.field input,
.field textarea {
  width: 100%;
  font: inherit;
  font-size: .97rem;
  color: var(--white);
  background: rgba(0,0,0,.42);
  border: 1px solid var(--panel-brd);
  border-radius: var(--radius-sm);
  padding: 12px 13px;
  transition: border-color .18s ease, background .18s ease, box-shadow .18s ease;
}
.field textarea { resize: vertical; min-height: 118px; }
.field input::placeholder,
.field textarea::placeholder { color: var(--ink-faint); }

.field input:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--panel-brd-hi);
  background: rgba(0,0,0,.58);
  box-shadow: 0 0 0 3px rgba(255,255,255,.09);
}

.field input:hover,
.field textarea:hover {
  border-color: rgba(255,255,255,.26);
}

.field.invalid input,
.field.invalid textarea {
  border-color: #ffffff;
  box-shadow: 0 0 0 3px rgba(255,255,255,.14);
}

.hp { position: absolute !important; left: -9999px !important; width: 1px; height: 1px; opacity: 0; }

.err {
  margin: 0;
  min-height: 0;
  font-size: .8rem;
  color: var(--white);
  font-weight: 600;
}
.err:empty { display: none; }
.err::before { content: "! "; font-weight: 800; }
.count {
  margin: -2px 0 0;
  align-self: flex-end;
  font-size: .74rem;
  color: var(--ink-faint);
  font-variant-numeric: tabular-nums;
}

/* Submit */
.submit {
  position: relative;
  margin-top: 4px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  padding: 14px 18px;
  font: inherit;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--black);
  background: var(--white);
  border: 1px solid var(--white);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: transform .18s ease, opacity .18s ease, box-shadow .18s ease;
}
.submit:disabled { opacity: .55; cursor: not-allowed; transform: none; box-shadow: none; }
.spinner {
  display: none;
  width: 16px; height: 16px;
  border: 2px solid rgba(0,0,0,.35);
  border-top-color: var(--black);
  border-radius: 50%;
  animation: spin .7s linear infinite;
}
.submit.loading .spinner { display: inline-block; }
.submit.loading .submit-label { opacity: .75; }
@keyframes spin { to { transform: rotate(360deg); } }

.status {
  margin: 4px 0 0;
  min-height: 0;
  font-size: .9rem;
  font-weight: 600;
  color: var(--white);
}
.status:empty { display: none; }
.status.ok::before { content: "\2713  "; font-weight: 800; }
.status.no::before { content: "\26A0  "; font-weight: 800; }

.privacy { margin: 2px 0 0; font-size: .78rem; color: var(--ink-faint); }

/* ---------- Footer ---------- */
.foot {
  position: relative;
  z-index: 2;
  flex: 0 0 auto;
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 16px clamp(18px, 4vw, 44px) clamp(18px, 3vw, 26px);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: .84rem;
  color: var(--ink-faint);
}
.foot a { color: var(--ink-dim); text-decoration: none; }
.foot a:hover { color: var(--white); }
.foot .dot { opacity: .6; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .shell {
    grid-template-columns: 1fr;
    align-content: start;
    gap: clamp(14px, 3vh, 26px);
    padding-top: clamp(14px, 3vh, 26px);
    padding-bottom: 8px;
  }
  .brand { max-width: 640px; }
  .tagline { max-width: 60ch; }
  .contact { min-height: 0; }
}

@media (max-width: 760px) {
  .brand-head { gap: 10px; }
  .logo { width: 44px; height: 44px; }
  .brand-name { font-size: 1.8rem; }
  .tagline { margin-top: 8px; font-size: .9rem; }
  .socials { margin-top: 12px; gap: 7px; display: grid; grid-template-columns: 1fr 1fr; }
  .social { padding: 8px 11px; gap: 10px; }
  .social-ic { width: 27px; height: 27px; border-radius: 7px; }
  .social-ic svg { width: 16px; height: 16px; }
  .social-k { font-size: .68rem; }
  .social-v { font-size: .86rem; }
  .micro { display: none; }
  .card { padding: 13px 14px; border-radius: 13px; }
  .card-title { font-size: 1.15rem; }
  .card-sub { margin: 3px 0 9px; font-size: .8rem; }
  .form { gap: 8px; }
  .row { grid-template-columns: 1fr 1fr; gap: 8px; }
  .field { gap: 4px; }
  .field label { font-size: .7rem; }
  .field input, .field textarea { padding: 9px 10px; font-size: .92rem; border-radius: 9px; }
  .field textarea { min-height: 58px; }
  .submit { padding: 10px 12px; font-size: .93rem; }
  .status { font-size: .82rem; }
  .privacy { display: none; }
  .foot { font-size: .74rem; padding: 4px 18px 8px; gap: 6px; }
}

@media (max-width: 460px) {
  .socials { grid-template-columns: 1fr; }
  .social-v { font-size: .8rem; }
}

@media (max-width: 380px) {
  .row { grid-template-columns: 1fr; }
  .field textarea { min-height: 54px; }
}

/* Very short landscape phones: strip secondary text so the form stays visible */
@media (max-width: 900px) and (max-height: 520px) {
  .tagline, .micro, .privacy, .card-sub { display: none; }
  .shell { gap: 12px; padding-top: 10px; }
  .socials { margin-top: 10px; grid-template-columns: 1fr 1fr; }
  .social { padding: 7px 9px; }
  .social-ic { width: 24px; height: 24px; }
  .social-k { display: none; }
  .card-title { font-size: 1.05rem; margin: 0; }
  .form { gap: 7px; }
  .field input, .field textarea { padding: 8px 9px; }
  .field textarea { min-height: 46px; }
  .submit { padding: 9px 11px; }
}

@media (max-width: 560px) {
  .social { padding: 8px 11px; gap: 10px; }
  .social-ic { width: 27px; height: 27px; }
  .card { border-radius: 13px; }
  .brand-name { letter-spacing: -0.02em; }
}

/* Landscape phones: tighten vertical rhythm so it fits */
@media (max-height: 560px) and (orientation: landscape) {
  .shell { padding-top: 20px; padding-bottom: 20px; gap: 26px; }
  .socials { margin-top: 18px; }
  .card-sub { margin-bottom: 14px; }
  .field textarea { min-height: 84px; }
}

/* Compact the layout for short viewports so the whole page fits one screen */
@media (max-height: 840px) {
  .shell { padding-top: 16px; padding-bottom: 12px; gap: 30px; }
  .brand-head { gap: 12px; }
  .logo { width: 54px; height: 54px; }
  .brand-name { font-size: 2.2rem; }
  .tagline { margin-top: 12px; font-size: 1rem; }
  .socials { margin-top: 18px; gap: 9px; }
  .social { padding: 10px 13px; gap: 12px; }
  .social-ic { width: 30px; height: 30px; }
  .micro { margin-top: 14px; font-size: .78rem; }
  .card { padding: 18px 20px; }
  .card-sub { margin: 6px 0 14px; font-size: .88rem; }
  .form { gap: 11px; }
  .field textarea { min-height: 88px; }
  .foot { padding-top: 6px; padding-bottom: 10px; }
}

@media (max-height: 700px) {
  .logo { width: 46px; height: 46px; }
  .brand-name { font-size: 1.9rem; }
  .tagline { margin-top: 8px; font-size: .92rem; }
  .socials { margin-top: 14px; gap: 7px; }
  .social { padding: 8px 12px; }
  .social-k { font-size: .72rem; }
  .social-v { font-size: .9rem; }
  .micro { display: none; }
  .card { padding: 14px 16px; }
  .card-title { font-size: 1.25rem; }
  .card-sub { margin: 4px 0 10px; font-size: .84rem; }
  .form { gap: 9px; }
  .field { gap: 5px; }
  .field label { font-size: .76rem; }
  .field input, .field textarea { padding: 9px 11px; font-size: .92rem; }
  .field textarea { min-height: 70px; }
  .submit { padding: 11px 14px; font-size: .95rem; }
  .privacy { display: none; }
}

/* ---------- Entrance motion ---------- */
.brand   { animation: rise .7s cubic-bezier(.22,1,.36,1) both; }
.contact { animation: rise .7s cubic-bezier(.22,1,.36,1) .1s both; }
.foot    { animation: rise .7s cubic-bezier(.22,1,.36,1) .2s both; }
@keyframes rise {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}