/* ==========================================================================
   Top Speed Gear — design system (TSG_DESIGN_SPEC.md)
   Dark theme only. One accent: tsg-red. One radius scale: 10px.
   ========================================================================== */

:root {
  --tsg-black:   #0A0A0B;
  --tsg-carbon:  #141417;
  --tsg-line:    #26262B;
  --tsg-red:     #D0121B;
  --tsg-red-deep:#8E0D14;
  --tsg-silver:  #C9CCD1;
  --tsg-white:   #F5F6F7;

  --font-display: "Saira Condensed", "Arial Narrow", sans-serif;
  --font-body:    "Outfit", "Segoe UI", sans-serif;

  --radius: 10px;
  --radius-btn: 6px;
  --container: 1400px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--tsg-black);
  color: var(--tsg-white);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }
ul, ol { list-style: none; }

::selection { background: var(--tsg-red); color: var(--tsg-white); }

/* ---------- a11y ---------- */
.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 200;
  background: var(--tsg-red); color: var(--tsg-white);
  padding: 0.6rem 1rem; border-radius: 0 0 var(--radius-btn) 0;
}
.skip-link:focus { left: 0; }
:focus-visible { outline: 2px solid var(--tsg-red); outline-offset: 3px; border-radius: 2px; }

/* ---------- typography ---------- */
h1, h2, h3, .display {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.02;
  letter-spacing: -0.01em;
  text-wrap: balance;
}
h1 { font-size: clamp(2.6rem, 6vw, 4.6rem); }
h2 { font-size: clamp(1.9rem, 4vw, 3rem); }
h3 { font-size: clamp(1.25rem, 2.2vw, 1.6rem); font-weight: 700; }
.h1-slant { font-style: italic; } /* hero only — echoes the logo's speed slant */

p { max-width: 65ch; }
.text-silver { color: var(--tsg-silver); }
.eyebrow {
  display: inline-flex; align-items: center; gap: 0.6rem;
  font-size: 0.78rem; font-weight: 600; letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--tsg-red);
  margin-bottom: 1rem;
}
.eyebrow::before {
  content: ""; width: 26px; height: 2px; background: var(--tsg-red);
}

/* ---------- layout ---------- */
.container { max-width: var(--container); margin-inline: auto; padding-inline: 1.5rem; }
@media (min-width: 768px) { .container { padding-inline: 2.5rem; } }

.section { padding-block: 5rem; }
@media (min-width: 768px) { .section { padding-block: 7rem; } }
.section--carbon { background: var(--tsg-carbon); }

.section-head { margin-bottom: 3rem; max-width: 720px; }
.section-head p { margin-top: 1rem; color: var(--tsg-silver); }

/* speed-line motif (max 2 per page) */
.speedlines {
  position: absolute; pointer-events: none; opacity: 0.5;
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.55rem;
  font-family: var(--font-body); font-weight: 600; font-size: 0.95rem;
  letter-spacing: 0.04em; text-transform: uppercase;
  padding: 0.85rem 1.7rem; border-radius: var(--radius-btn);
  border: 1px solid transparent;
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease),
              color 0.2s var(--ease), transform 0.2s var(--ease);
}
.btn:active { transform: translateY(1px); }
.btn--primary { background: var(--tsg-red); color: var(--tsg-white); }
.btn--primary:hover { background: var(--tsg-red-deep); }
.btn--ghost {
  background: transparent; color: var(--tsg-silver);
  border-color: var(--tsg-line);
}
.btn--ghost:hover { border-color: var(--tsg-silver); color: var(--tsg-white); }
.btn--lg { padding: 1rem 2.2rem; font-size: 1rem; }

/* ---------- nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(10, 10, 11, 0.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--tsg-line);
}
.nav__inner {
  max-width: var(--container); margin-inline: auto; padding-inline: 1.5rem;
  height: 72px; display: flex; align-items: center; gap: 2rem;
}
@media (min-width: 768px) { .nav__inner { padding-inline: 2.5rem; } }
.nav__logo { display: flex; align-items: center; gap: 0.7rem; flex-shrink: 0; }
.nav__logo img { height: 44px; width: auto; }
.nav__links { display: none; align-items: center; gap: 1.6rem; margin-left: auto; }
.nav__links a {
  font-size: 0.82rem; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--tsg-silver); padding: 0.4rem 0; position: relative;
  transition: color 0.2s var(--ease);
}
.nav__links a::after {
  content: ""; position: absolute; left: 0; bottom: 0; height: 2px; width: 0;
  background: var(--tsg-red); transition: width 0.25s var(--ease);
}
.nav__links a:hover, .nav__links a[aria-current="page"] { color: var(--tsg-white); }
.nav__links a:hover::after, .nav__links a[aria-current="page"]::after { width: 100%; }
.nav__cta { display: none; margin-left: 0.5rem; }
.nav__burger {
  margin-left: auto; background: none; border: 1px solid var(--tsg-line);
  border-radius: var(--radius-btn); padding: 0.55rem 0.7rem; color: var(--tsg-white);
  display: inline-flex; flex-direction: column; gap: 5px;
}
.nav__burger span { width: 20px; height: 2px; background: currentColor; transition: transform 0.25s var(--ease), opacity 0.2s; }
.nav__burger[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__burger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav__burger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (min-width: 1100px) {
  .nav__links { display: flex; }
  .nav__cta { display: inline-flex; }
  .nav__burger { display: none; }
}

.nav__drawer {
  display: none; border-top: 1px solid var(--tsg-line);
  background: var(--tsg-black); padding: 1rem 1.5rem 1.6rem;
}
.nav__drawer.is-open { display: block; }
.nav__drawer a {
  display: block; padding: 0.8rem 0.2rem; font-weight: 600;
  letter-spacing: 0.08em; text-transform: uppercase; font-size: 0.9rem;
  color: var(--tsg-silver); border-bottom: 1px solid var(--tsg-line);
}
.nav__drawer a:hover { color: var(--tsg-white); }
.nav__drawer .btn { margin-top: 1.2rem; width: 100%; }
@media (min-width: 1100px) { .nav__drawer { display: none !important; } }

/* ---------- hero (asymmetric split) ---------- */
.hero { position: relative; overflow: hidden; }
.hero__grid {
  display: grid; gap: 2.5rem; align-items: center;
  padding-block: 4rem 5rem;
}
@media (min-width: 900px) {
  .hero__grid { grid-template-columns: minmax(0, 46fr) minmax(0, 54fr); padding-block: 5.5rem 6.5rem; }
}
.hero__sub { margin-top: 1.4rem; color: var(--tsg-silver); font-size: 1.08rem; }
.hero__ctas { margin-top: 2.2rem; display: flex; flex-wrap: wrap; gap: 1rem; }
.hero__media { position: relative; }
.hero__media img {
  width: 100%; aspect-ratio: 4 / 3.4; object-fit: cover;
  border-radius: var(--radius);
  filter: saturate(0.85) contrast(1.05);
}
.hero__media::after { /* dark tint for placeholder consistency */
  content: ""; position: absolute; inset: 0; border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(10,10,11,0.15), rgba(10,10,11,0.55));
  pointer-events: none;
}
@media (min-width: 900px) {
  .hero__media { margin-right: -6vw; } /* breaks the grid edge */
  .hero__media img { aspect-ratio: 5 / 4; }
}

/* ---------- category triad ---------- */
.triad { display: grid; gap: 1.4rem; }
@media (min-width: 900px) {
  .triad { grid-template-columns: repeat(3, 1fr); align-items: end; }
  .triad__card:nth-child(2) { transform: translateY(-2.2rem); }
}
.triad__card {
  position: relative; display: block; border-radius: var(--radius); overflow: hidden;
  background: var(--tsg-carbon); border: 1px solid var(--tsg-line);
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease);
}
.triad__card:hover { transform: translateY(-4px); border-color: #3a3a41; }
@media (min-width: 900px) {
  .triad__card:nth-child(2):hover { transform: translateY(calc(-2.2rem - 4px)); }
}
.triad__card img { aspect-ratio: 4 / 5; object-fit: cover; width: 100%; filter: saturate(0.8); }
.triad__body { position: absolute; inset: auto 0 0 0; padding: 1.5rem;
  background: linear-gradient(to top, rgba(10,10,11,0.95) 30%, transparent); }
.triad__body h3 { position: relative; display: inline-block; padding-bottom: 0.3rem; }
.triad__body h3::after {
  content: ""; position: absolute; left: 0; bottom: 0; height: 2px; width: 0;
  background: var(--tsg-red); transition: width 0.3s var(--ease);
}
.triad__card:hover h3::after { width: 100%; }
.triad__body p { margin-top: 0.4rem; font-size: 0.92rem; color: var(--tsg-silver); }
.triad__body .link { margin-top: 0.7rem; }

.link {
  display: inline-flex; align-items: center; gap: 0.4rem;
  color: var(--tsg-red); font-weight: 600; font-size: 0.88rem;
  letter-spacing: 0.06em; text-transform: uppercase;
}

/* ---------- stats ---------- */
.stats { display: grid; gap: 1px; background: var(--tsg-line);
  border: 1px solid var(--tsg-line); border-radius: var(--radius); overflow: hidden;
  grid-template-columns: repeat(2, 1fr); }
@media (min-width: 900px) { .stats { grid-template-columns: repeat(4, 1fr); } }
.stats__cell { background: var(--tsg-carbon); padding: 1.6rem 1.4rem; }
.stats__value { font-family: var(--font-display); font-weight: 800; font-size: 2rem; color: var(--tsg-white); }
.stats__label { margin-top: 0.2rem; font-size: 0.85rem; color: var(--tsg-silver); }

/* ---------- OEM strip ---------- */
.oem {
  background: linear-gradient(120deg, var(--tsg-carbon) 0%, #101013 100%);
  border-block: 1px solid var(--tsg-line);
}
.oem__inner { display: grid; gap: 2rem; align-items: center; }
@media (min-width: 900px) { .oem__inner { grid-template-columns: 1.4fr 1fr; } }
.oem__inner .btn { justify-self: start; }
@media (min-width: 900px) { .oem__inner .btn { justify-self: end; } }

/* ---------- process strip ---------- */
.process { display: grid; gap: 1rem; grid-template-columns: repeat(2, 1fr); counter-reset: step; }
@media (min-width: 700px) { .process { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 1100px) { .process { grid-template-columns: repeat(6, 1fr); } }
.process__step {
  counter-increment: step;
  background: var(--tsg-carbon); border: 1px solid var(--tsg-line);
  border-radius: var(--radius); padding: 1.3rem 1.1rem;
  font-weight: 600; font-size: 0.92rem;
}
.process__step::before {
  content: "0" counter(step);
  display: block; font-family: var(--font-display); font-weight: 800;
  font-size: 1.5rem; color: var(--tsg-red); margin-bottom: 0.5rem;
}

/* ---------- product grid ---------- */
.grid-products { display: grid; gap: 1.4rem; grid-template-columns: 1fr; }
@media (min-width: 640px) { .grid-products { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .grid-products { grid-template-columns: repeat(3, 1fr); } }
.pcard {
  background: var(--tsg-carbon); border: 1px solid var(--tsg-line);
  border-radius: var(--radius); overflow: hidden; display: flex; flex-direction: column;
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease);
}
.pcard:hover { transform: translateY(-4px); border-color: #3a3a41; }
.pcard img { aspect-ratio: 7 / 6; object-fit: cover; width: 100%; filter: saturate(0.8); }
.pcard__body { padding: 1.4rem; display: flex; flex-direction: column; gap: 0.7rem; flex: 1; }
.pcard__body p { font-size: 0.93rem; color: var(--tsg-silver); }
.chips { display: flex; flex-wrap: wrap; gap: 0.45rem; margin-top: auto; padding-top: 0.6rem; }
.chip {
  font-size: 0.72rem; font-weight: 600; letter-spacing: 0.05em;
  color: var(--tsg-silver); border: 1px solid var(--tsg-line);
  border-radius: 999px; padding: 0.22rem 0.65rem; white-space: nowrap;
}

/* ---------- signature / split sections ---------- */
.split { display: grid; gap: 2.5rem; align-items: center; }
@media (min-width: 900px) { .split { grid-template-columns: 1fr 1fr; } }
.split--rev > :first-child { order: 2; }
@media (max-width: 899px) { .split--rev > :first-child { order: 0; } }
.split img { border-radius: var(--radius); aspect-ratio: 4 / 3; object-fit: cover; width: 100%; filter: saturate(0.8); }
.feature-list { display: grid; gap: 1.1rem; margin-top: 1.6rem; }
.feature-list li { display: flex; gap: 0.9rem; align-items: flex-start; color: var(--tsg-silver); }
.feature-list li::before {
  content: ""; flex-shrink: 0; width: 8px; height: 8px; margin-top: 0.55rem;
  background: var(--tsg-red); border-radius: 1px; transform: skewX(-12deg);
}
.feature-list strong { color: var(--tsg-white); }

/* ---------- manufacturing steps ---------- */
.mfg-steps { display: grid; gap: 1.5rem; }
.mfg-step {
  display: grid; gap: 1.5rem; align-items: center;
  background: var(--tsg-carbon); border: 1px solid var(--tsg-line);
  border-radius: var(--radius); overflow: hidden;
}
@media (min-width: 800px) {
  .mfg-step { grid-template-columns: 1fr 1.3fr; }
  .mfg-step:nth-child(even) > .mfg-step__media { order: 2; }
}
.mfg-step__media img { aspect-ratio: 16 / 10; object-fit: cover; width: 100%; height: 100%; filter: saturate(0.75); }
.mfg-step__body { padding: 1.8rem; }
.mfg-step__num { font-family: var(--font-display); font-weight: 800; font-size: 1.2rem; color: var(--tsg-red); }
.mfg-step__body h3 { margin: 0.3rem 0 0.6rem; }
.mfg-step__body p { color: var(--tsg-silver); }

.step-indicator {
  position: sticky; top: 84px; z-index: 5; display: flex; gap: 0.5rem;
  padding: 0.7rem 0; margin-bottom: 1.5rem; flex-wrap: wrap;
}
.step-indicator a {
  font-size: 0.75rem; font-weight: 600; letter-spacing: 0.06em;
  color: var(--tsg-silver); border: 1px solid var(--tsg-line);
  border-radius: 999px; padding: 0.3rem 0.8rem; background: var(--tsg-black);
  transition: color 0.2s, border-color 0.2s;
}
.step-indicator a.is-active { color: var(--tsg-white); border-color: var(--tsg-red); }

/* ---------- two-col compare (OEM vs ODM) ---------- */
.compare { display: grid; gap: 1.4rem; }
@media (min-width: 800px) { .compare { grid-template-columns: 1fr 1fr; } }
.compare__col {
  background: var(--tsg-carbon); border: 1px solid var(--tsg-line);
  border-radius: var(--radius); padding: 2rem;
}
.compare__col h3 { color: var(--tsg-red); }
.compare__col p { margin-top: 0.8rem; color: var(--tsg-silver); }

/* ---------- gallery ---------- */
.filter-tabs { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-bottom: 2rem; }
.filter-tabs button {
  background: transparent; color: var(--tsg-silver);
  border: 1px solid var(--tsg-line); border-radius: 999px;
  padding: 0.45rem 1.1rem; font-size: 0.85rem; font-weight: 600;
  letter-spacing: 0.05em; text-transform: uppercase;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}
.filter-tabs button[aria-pressed="true"] { background: var(--tsg-red); border-color: var(--tsg-red); color: var(--tsg-white); }
.masonry { columns: 1; column-gap: 1.2rem; }
@media (min-width: 600px) { .masonry { columns: 2; } }
@media (min-width: 1000px) { .masonry { columns: 3; } }
.masonry__item { break-inside: avoid; margin-bottom: 1.2rem; }
.masonry__item button { display: block; width: 100%; border: 0; padding: 0; background: none; border-radius: var(--radius); overflow: hidden; }
.masonry__item img {
  width: 100%; border-radius: var(--radius); filter: saturate(0.8);
  transition: transform 0.3s var(--ease), filter 0.3s var(--ease);
}
.masonry__item button:hover img { transform: scale(1.02); filter: saturate(1); }
.masonry__item.is-hidden { display: none; }

.lightbox {
  position: fixed; inset: 0; z-index: 150; display: none;
  background: rgba(10, 10, 11, 0.94); padding: 2rem;
  align-items: center; justify-content: center;
}
.lightbox.is-open { display: flex; }
.lightbox img { max-height: 85vh; max-width: 92vw; border-radius: var(--radius); }
.lightbox__close {
  position: absolute; top: 1.2rem; right: 1.4rem;
  background: none; border: 1px solid var(--tsg-line); color: var(--tsg-white);
  border-radius: var(--radius-btn); padding: 0.5rem 0.9rem; font-size: 1rem;
}
.lightbox__caption { position: absolute; bottom: 1.4rem; left: 50%; transform: translateX(-50%);
  color: var(--tsg-silver); font-size: 0.9rem; }

/* ---------- forms ---------- */
.form-grid { display: grid; gap: 1.2rem; }
@media (min-width: 640px) { .form-grid { grid-template-columns: 1fr 1fr; }
  .form-grid .span-2 { grid-column: span 2; } }
.field label { display: block; font-size: 0.85rem; font-weight: 600; letter-spacing: 0.04em; margin-bottom: 0.4rem; }
.field .req { color: var(--tsg-red); }
.field input, .field select, .field textarea {
  width: 100%; background: var(--tsg-black); color: var(--tsg-white);
  border: 1px solid var(--tsg-line); border-radius: var(--radius-btn);
  padding: 0.75rem 0.9rem; font: inherit; font-size: 0.95rem;
}
.field input:focus, .field select:focus, .field textarea:focus {
  outline: 2px solid var(--tsg-red); outline-offset: 1px; border-color: var(--tsg-red);
}
.field textarea { min-height: 130px; resize: vertical; }
.field .error-msg { display: none; color: #ff6b71; font-size: 0.82rem; margin-top: 0.35rem; }
.field.has-error input, .field.has-error select, .field.has-error textarea { border-color: var(--tsg-red); }
.field.has-error .error-msg { display: block; }
.hp-field { position: absolute; left: -9999px; height: 0; overflow: hidden; }

.form-status { margin-top: 1.2rem; padding: 1rem 1.2rem; border-radius: var(--radius-btn); display: none; }
.form-status.is-ok { display: block; background: rgba(38, 120, 60, 0.15); border: 1px solid #2f7a3f; color: #9fdcab; }
.form-status.is-err { display: block; background: rgba(208, 18, 27, 0.12); border: 1px solid var(--tsg-red); color: #ff9ba0; }

/* ---------- contact split ---------- */
.contact-split { display: grid; gap: 3rem; align-items: start; }
@media (min-width: 980px) { .contact-split { grid-template-columns: 1fr 1.3fr; } }
.next-steps { counter-reset: ns; display: grid; gap: 1.2rem; margin-top: 1.8rem; }
.next-steps li { counter-increment: ns; display: flex; gap: 1rem; color: var(--tsg-silver); }
.next-steps li::before {
  content: counter(ns);
  flex-shrink: 0; width: 32px; height: 32px; border-radius: 50%;
  border: 1px solid var(--tsg-red); color: var(--tsg-red);
  display: inline-flex; align-items: center; justify-content: center;
  font-family: var(--font-display); font-weight: 800;
}
.contact-card { background: var(--tsg-carbon); border: 1px solid var(--tsg-line);
  border-radius: var(--radius); padding: 2rem; }

/* ---------- RFQ band ---------- */
.rfq-band {
  background: linear-gradient(120deg, var(--tsg-red-deep), var(--tsg-red));
  text-align: center;
}
.rfq-band .container { padding-block: 4.5rem; }
.rfq-band h2 { color: var(--tsg-white); }
.rfq-band p { margin: 1rem auto 2rem; color: rgba(245, 246, 247, 0.85); }
.rfq-band .btn { background: var(--tsg-black); color: var(--tsg-white); }
.rfq-band .btn:hover { background: #1c1c20; }

/* ---------- footer ---------- */
.footer { border-top: 1px solid var(--tsg-line); background: var(--tsg-black); }
.footer__grid { display: grid; gap: 2.5rem; padding-block: 4rem; }
@media (min-width: 800px) { .footer__grid { grid-template-columns: 1.4fr 1fr 1fr 1.2fr; } }
.footer__brand img { height: 64px; width: auto; margin-bottom: 1rem; }
.footer__brand p { font-size: 0.92rem; color: var(--tsg-silver); }
.footer h4 { font-size: 0.8rem; letter-spacing: 0.15em; text-transform: uppercase; color: var(--tsg-white); margin-bottom: 1.1rem; }
.footer ul { display: grid; gap: 0.6rem; }
.footer ul a { color: var(--tsg-silver); font-size: 0.92rem; transition: color 0.2s; }
.footer ul a:hover { color: var(--tsg-white); }
.footer__bottom {
  border-top: 1px solid var(--tsg-line); padding-block: 1.4rem;
  display: flex; flex-wrap: wrap; gap: 1rem; justify-content: space-between;
  font-size: 0.82rem; color: var(--tsg-silver);
}

/* ---------- WhatsApp fab ---------- */
.wa-fab {
  position: fixed; right: 1.2rem; bottom: 1.2rem; z-index: 90;
  width: 54px; height: 54px; border-radius: 50%;
  background: #25D366; display: flex; align-items: center; justify-content: center;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.45);
  transition: transform 0.2s var(--ease);
}
.wa-fab:hover { transform: translateY(-3px); }
.wa-fab svg { width: 28px; height: 28px; fill: #fff; }

/* ---------- 404 ---------- */
.err404 { text-align: center; padding-block: 8rem; }
.err404 .display { font-size: clamp(5rem, 16vw, 10rem); color: var(--tsg-red); }

/* ---------- reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(16px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease); }
.reveal.is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}