/* ==============================================
   WT Technik — Style System
   Inspired by Tresmares Capital visual language
   ============================================== */

/* ── Google Fonts already loaded in HTML ── */

/* ── Design Tokens ── */
:root {
  --white:      #ffffff;
  --off-white:  #F7F6F3;
  --light:      #EEECEA;
  --border:     #E0DDD8;
  --text-1:     #111111;
  --text-2:     #555555;
  --text-3:     #999999;
  --red:        #E8001C;
  --red-dark:   #C0001A;
  --dark:       #0F0F0F;
  --dark-2:     #1A1A1A;
  --dark-3:     #252525;

  --font-display: 'Barlow Condensed', 'Noto Sans SC', sans-serif;
  --font-body:    'Inter', 'Noto Sans SC', sans-serif;
  --font-cn:      'Noto Sans SC', 'PingFang SC', sans-serif;

  --nav-h:    72px;
  --max-w:    1280px;
  --ease:     cubic-bezier(.25,.46,.45,.94);
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-body);
  background: var(--white);
  color: var(--text-1);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button { cursor: pointer; background: none; border: none; font-family: inherit; }
ul { list-style: none; }

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 3px; }
::-webkit-scrollbar-track { background: var(--light); }
::-webkit-scrollbar-thumb { background: var(--red); }

/* ── Container ── */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 56px;
}

/* ── Placeholder images ── */
.img-placeholder {
  background: var(--light);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: var(--text-3);
  font-family: var(--font-body);
  font-size: 12px;
  letter-spacing: .05em;
  width: 100%;
}


/* ============================================================
   HEADER / NAV
   ============================================================ */
#site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 200;
  height: var(--nav-h);
  background: rgba(255,255,255,0);
  border-bottom: 1px solid transparent;
  transition: background .35s var(--ease), border-color .35s var(--ease);
}
#site-header.scrolled {
  background: rgba(255,255,255,.97);
  border-bottom-color: var(--border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.header-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 56px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

/* Logo */
.logo { display: flex; align-items: baseline; gap: 1px; }
.logo-wt {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.6rem;
  color: var(--red);
  text-transform: uppercase;
  letter-spacing: -.02em;
  line-height: 1;
}
.logo-technik {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.6rem;
  color: var(--dark);
  text-transform: lowercase;
  letter-spacing: .02em;
  line-height: 1;
}

/* Desktop nav links */
.main-nav {
  display: flex;
  gap: 36px;
  align-items: center;
}
.main-nav a {
  font-family: var(--font-cn);
  font-size: 13.5px;
  font-weight: 400;
  color: var(--text-2);
  letter-spacing: .03em;
  position: relative;
  transition: color .2s;
}
.main-nav a::after {
  content: '';
  position: absolute;
  left: 0; bottom: -3px;
  width: 0; height: 1px;
  background: var(--red);
  transition: width .25s var(--ease);
}
.main-nav a:hover { color: var(--text-1); }
.main-nav a:hover::after { width: 100%; }

/* Header CTA */
.btn-header {
  font-family: var(--font-cn);
  font-size: 13px;
  font-weight: 500;
  color: var(--white);
  background: var(--dark);
  padding: 9px 22px;
  letter-spacing: .04em;
  transition: background .2s;
  white-space: nowrap;
}
.btn-header:hover { background: var(--red); }

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 6px;
  padding: 4px;
}
.hamburger span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--dark);
  transform-origin: center;
  transition: transform .28s var(--ease), opacity .28s;
}
.hamburger.open span:first-child { transform: rotate(45deg) translate(5px,5px); }
.hamburger.open span:last-child  { transform: rotate(-45deg) translate(5px,-5px); }

/* Mobile panel */
.mobile-panel {
  display: none;
  position: fixed;
  top: var(--nav-h); left: 0; right: 0; bottom: 0;
  background: var(--white);
  z-index: 199;
  padding: 48px 56px;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--border);
  overflow-y: auto;
}
.mobile-panel.open { display: flex; }
.mobile-panel nav { display: flex; flex-direction: column; }
.mob-link {
  font-family: var(--font-cn);
  font-size: 1.4rem;
  font-weight: 500;
  color: var(--text-1);
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
  transition: color .2s, padding-left .2s;
  display: block;
}
.mob-link:hover { color: var(--red); padding-left: 8px; }
.btn-mob-cta {
  margin-top: 32px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--red) !important;
  border-bottom: none !important;
  padding-top: 0 !important;
}


/* ============================================================
   BUTTONS
   ============================================================ */
.btn-primary {
  display: inline-block;
  padding: 13px 28px;
  background: var(--red);
  color: var(--white);
  font-family: var(--font-cn);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: .04em;
  transition: background .2s, transform .15s;
}
.btn-primary:hover { background: var(--red-dark); transform: translateY(-1px); }

.btn-ghost {
  display: inline-block;
  padding: 12px 24px;
  border: 1px solid var(--text-1);
  color: var(--text-1);
  font-family: var(--font-cn);
  font-size: 14px;
  font-weight: 400;
  letter-spacing: .03em;
  transition: background .2s, color .2s, border-color .2s;
}
.btn-ghost:hover { background: var(--text-1); color: var(--white); }

.btn-text-link {
  display: inline-block;
  font-family: var(--font-cn);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-1);
  letter-spacing: .03em;
  border-bottom: 1px solid var(--text-1);
  padding-bottom: 2px;
  margin-top: 32px;
  transition: color .2s, border-color .2s;
}
.btn-text-link:hover { color: var(--red); border-color: var(--red); }


/* ============================================================
   SECTIONS — shared
   ============================================================ */
.section { padding: 120px 0; }
.section-alt { background: var(--off-white); }
.section-dark { background: var(--dark); }

/* Label above headings */
.section-label {
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.section-label::before {
  content: '';
  display: block;
  width: 24px;
  height: 1px;
  background: var(--red);
  flex-shrink: 0;
}

/* Main heading */
.section-heading {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.4rem, 4.5vw, 4rem);
  line-height: .96;
  letter-spacing: -.015em;
  text-transform: uppercase;
  color: var(--text-1);
}

/* Two-column header row */
.section-header-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: end;
  margin-bottom: 64px;
}
.section-intro {
  font-family: var(--font-cn);
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text-2);
  align-self: end;
}

.body-text {
  font-family: var(--font-cn);
  font-size: .975rem;
  line-height: 1.9;
  color: var(--text-2);
  margin-top: 14px;
}


/* ============================================================
   HERO
   ============================================================ */
.hero {
  padding-top: var(--nav-h);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.hero-content {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 80px 56px 100px;
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 72px;
  align-items: center;
  width: 100%;
}

/* Hero text */
.hero-eyebrow {
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.hero-eyebrow::before {
  content: '';
  width: 24px;
  height: 1px;
  background: var(--red);
  flex-shrink: 0;
}

.hero-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(3.5rem, 7vw, 6.5rem);
  line-height: .92;
  letter-spacing: -.025em;
  text-transform: uppercase;
  color: var(--text-1);
  margin-bottom: 8px;
}
.hero-title-en {
  display: block;
  color: var(--red);
}

.hero-desc {
  font-family: var(--font-cn);
  font-size: 1rem;
  line-height: 1.9;
  color: var(--text-2);
  margin: 24px 0 40px;
  max-width: 480px;
}

.hero-btns {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
}

/* Hero image side */
.hero-image {
  position: relative;
}
.hero-image .img-placeholder {
  width: 100%;
}

/* Floating stat card */
.hero-stat-card {
  position: absolute;
  bottom: -28px;
  left: -32px;
  background: var(--white);
  border: 1px solid var(--border);
  padding: 24px 28px;
  box-shadow: 0 8px 40px rgba(0,0,0,.08);
}
.stat-row {
  display: flex;
  align-items: center;
  gap: 0;
}
.stat-item {
  display: flex;
  flex-direction: column;
  padding: 0 20px;
  text-align: center;
}
.stat-item:first-child { padding-left: 0; }
.stat-item:last-child  { padding-right: 0; }
.stat-item strong {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-1);
  line-height: 1;
  letter-spacing: -.02em;
}
.stat-item strong span { color: var(--red); }
.stat-item span {
  font-family: var(--font-cn);
  font-size: 11px;
  color: var(--text-3);
  margin-top: 4px;
  letter-spacing: .04em;
}
.stat-divider {
  width: 1px;
  height: 36px;
  background: var(--border);
  flex-shrink: 0;
}

/* Scroll hint */
.scroll-hint {
  position: absolute;
  bottom: 36px;
  left: 56px;
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-3);
  font-size: 10px;
  letter-spacing: .2em;
  text-transform: uppercase;
  font-family: var(--font-body);
}
.scroll-line {
  width: 40px;
  height: 1px;
  background: var(--border);
  position: relative;
  overflow: hidden;
}
.scroll-line::after {
  content: '';
  position: absolute;
  left: -100%;
  top: 0;
  width: 100%;
  height: 100%;
  background: var(--red);
  animation: scrollSlide 2s ease-in-out infinite;
}
@keyframes scrollSlide {
  0%   { left: -100%; }
  50%  { left: 0; }
  100% { left: 100%; }
}


/* ============================================================
   MARQUEE
   ============================================================ */
.marquee-bar {
  background: var(--dark);
  overflow: hidden;
  padding: 14px 0;
  border-top: 1px solid var(--dark-3);
  border-bottom: 1px solid var(--dark-3);
}
.marquee-track {
  display: flex;
  align-items: center;
  gap: 0;
  width: max-content;
  animation: marqueeMove 32s linear infinite;
}
.marquee-track span {
  font-family: var(--font-body);
  font-size: 11px;
  letter-spacing: .15em;
  text-transform: uppercase;
  color: rgba(255,255,255,.35);
  padding: 0 28px;
  white-space: nowrap;
}
.marquee-track em {
  color: var(--red);
  font-style: normal;
  font-size: 14px;
  opacity: .6;
  flex-shrink: 0;
}
@keyframes marqueeMove {
  0%   { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}


/* ============================================================
   ABOUT
   ============================================================ */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

/* Images side */
.about-images {
  display: flex;
  flex-direction: column;
  gap: 0;
}
.about-img-main {
  width: 100%;
}
.about-img-secondary {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0;
  margin-top: 0;
}
.about-img-secondary .img-placeholder {
  border-top: 3px solid var(--red);
}

/* Accent card */
.about-accent-card {
  width: 120px;
  background: var(--red);
  color: var(--white);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 20px 12px;
  text-align: center;
  gap: 4px;
}
.about-accent-card strong {
  font-family: var(--font-body);
  font-size: 10px;
  letter-spacing: .15em;
  text-transform: uppercase;
  opacity: .75;
}
.accent-year {
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -.02em;
}
.about-accent-card p {
  font-family: var(--font-cn);
  font-size: 11px;
  opacity: .85;
  line-height: 1.5;
  margin-top: 6px;
}

/* Text side */
.about-lead {
  font-family: var(--font-cn);
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--text-1);
  line-height: 1.8;
  margin-top: 28px;
}

.about-figures {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border: 1px solid var(--border);
  margin-top: 40px;
}
.figure-item {
  padding: 20px 20px;
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.figure-item:last-child { border-right: none; }
.figure-item strong {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 800;
  color: var(--red);
  line-height: 1;
  letter-spacing: -.02em;
}
.figure-item span {
  font-family: var(--font-cn);
  font-size: 12px;
  color: var(--text-3);
  letter-spacing: .03em;
}


/* ============================================================
   SERVICES
   ============================================================ */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border: 1px solid var(--border);
}

.service-card {
  background: var(--white);
  display: flex;
  flex-direction: column;
  cursor: pointer;
  position: relative;
  transition: background .25s, box-shadow .25s;
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.service-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 3px; height: 0;
  background: var(--red);
  transition: height .3s var(--ease);
}
.service-card:hover::before { height: 100%; }
.service-card:hover { background: var(--off-white); }
.section-alt .service-card { background: var(--off-white); }
.section-alt .service-card:hover { background: var(--white); }

.service-card-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 20px;
}

.service-icon {
  width: 28px; height: 28px;
  color: var(--red);
  flex-shrink: 0;
}

.service-card-body {
  padding: 32px 32px 36px 36px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.service-num {
  font-family: 'Barlow Condensed', sans-serif;
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1;
  color: var(--border);
  letter-spacing: -.02em;
  transition: color .25s;
}
.service-card:hover .service-num { color: var(--red); opacity: .25; }

.service-card-body h3 {
  font-family: var(--font-cn);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-1);
  line-height: 1.5;
  margin-bottom: 12px;
}

.service-card-body p {
  font-family: var(--font-cn);
  font-size: .875rem;
  line-height: 1.85;
  color: var(--text-2);
  flex: 1;
}

.service-tags {
  font-family: var(--font-cn);
  font-size: .875rem;
  line-height: 2;
  color: var(--text-2);
  flex: 1;
}
.tag-sep {
  margin: 0 8px;
  color: var(--red);
  font-weight: 300;
}

.card-arrow {
  display: inline-block;
  margin-top: 24px;
  font-size: 16px;
  color: var(--text-3);
  transform: translateX(0);
  transition: color .2s, transform .2s;
  width: fit-content;
}
.service-card:hover .card-arrow { color: var(--red); transform: translateX(6px); }


/* ============================================================
   CASES
   ============================================================ */
.cases-filter {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  align-self: end;
}
.filter-btn {
  padding: 7px 16px;
  font-family: var(--font-cn);
  font-size: 13px;
  color: var(--text-3);
  border: 1px solid var(--border);
  background: transparent;
  cursor: pointer;
  transition: all .2s;
  letter-spacing: .03em;
}
.filter-btn:hover { border-color: var(--text-2); color: var(--text-1); }
.filter-btn.active { background: var(--text-1); border-color: var(--text-1); color: var(--white); }

/* Cases Grid: featured + 4 equal */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2px;
  background: var(--border);
}
.case-card {
  background: var(--white);
  overflow: hidden;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  transition: opacity .3s;
}
.case-card.hidden { opacity: .15; pointer-events: none; }
.case-featured {
  grid-column: span 2;
  grid-row: span 2;
}

.case-img {
  overflow: hidden;
  flex: 1;
}
.case-img .img-placeholder {
  transition: transform .5s var(--ease);
}
.case-card:hover .case-img .img-placeholder {
  transform: scale(1.04);
}

.case-info {
  padding: 18px 20px;
  border-top: 1px solid var(--border);
  background: var(--white);
}
.case-tag {
  display: block;
  font-family: var(--font-body);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: .15em;
  text-transform: uppercase;
  color: var(--red);
  margin-bottom: 6px;
}
.case-info h3 {
  font-family: var(--font-cn);
  font-size: .925rem;
  font-weight: 600;
  color: var(--text-1);
  line-height: 1.4;
}
.case-featured .case-info h3 {
  font-size: 1.15rem;
}
.case-link {
  display: inline-block;
  margin-top: 8px;
  font-family: var(--font-body);
  font-size: 12px;
  color: var(--text-3);
  transition: color .2s;
}
.case-card:hover .case-link { color: var(--red); }

.cases-more {
  margin-top: 44px;
  text-align: center;
}


/* ============================================================
   CLIENTS
   ============================================================ */
.clients-sub {
  font-family: var(--font-cn);
  font-size: .9rem;
  color: var(--text-3);
  text-align: center;
  margin-bottom: 44px;
  letter-spacing: .04em;
}
.clients-mask {
  overflow: hidden;
  -webkit-mask-image: linear-gradient(to right, transparent, black 10%, black 90%, transparent);
  mask-image: linear-gradient(to right, transparent, black 10%, black 90%, transparent);
}
.clients-track {
  display: flex;
  align-items: center;
  width: max-content;
  animation: clientsMove 50s linear infinite;
}
.clients-track:hover {
  animation-play-state: paused;
}
.client-logo {
  display: block;
  width: 240px;
  height: 150px;
  flex-shrink: 0;
  object-fit: contain;
  object-position: center;
  padding: 20px 28px;
  margin: 0 8px;
  opacity: 0.65;
  transition: opacity 0.25s, filter 0.25s;
  filter: grayscale(20%);
}
.client-logo:hover {
  opacity: 1;
  filter: grayscale(0%);
}
@keyframes clientsMove {
  0%   { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}


/* ============================================================
   WHY CHOOSE US
   ============================================================ */
.why-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border: 1px solid var(--border);
  margin-top: 56px;
}
.why-card {
  padding: 36px 28px;
  border-right: 1px solid var(--border);
  transition: background .25s;
}
.why-card:last-child { border-right: none; }
.why-card:hover { background: var(--off-white); }

.why-icon {
  width: 44px;
  height: 44px;
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--red);
  margin-bottom: 20px;
  transition: border-color .25s, background .25s;
}
.why-card:hover .why-icon {
  border-color: var(--red);
  background: rgba(232,0,28,.06);
}

.why-card h3 {
  font-family: var(--font-cn);
  font-size: .975rem;
  font-weight: 700;
  color: var(--text-1);
  margin-bottom: 10px;
  line-height: 1.4;
}
.why-card p {
  font-family: var(--font-cn);
  font-size: .875rem;
  line-height: 1.85;
  color: var(--text-2);
}


/* ============================================================
   CONTACT
   ============================================================ */
.contact-grid {
  display: grid;
  grid-template-columns: 5fr 7fr;
  gap: 80px;
  align-items: start;
}

.contact-left .section-heading {
  color: var(--white);
  margin-bottom: 20px;
}

.contact-list {
  margin-top: 40px;
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid rgba(255,255,255,.1);
}
.contact-list li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 0;
  border-bottom: 1px solid rgba(255,255,255,.08);
  font-family: var(--font-cn);
  font-size: .9rem;
  color: rgba(255,255,255,.75);
  line-height: 1.6;
}
.contact-lbl {
  font-family: var(--font-body);
  font-size: 10px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: rgba(255,255,255,.35);
  font-weight: 500;
}
.contact-list a {
  color: rgba(255,255,255,.75);
  transition: color .2s;
}
.contact-list a:hover { color: var(--white); }

/* Form */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
.form-field {
  display: flex;
  flex-direction: column;
  gap: 7px;
}
.form-field label {
  font-family: var(--font-cn);
  font-size: 12px;
  font-weight: 500;
  color: rgba(255,255,255,.45);
  letter-spacing: .04em;
}
.req { color: var(--red); }

.form-field input,
.form-field select,
.form-field textarea {
  width: 100%;
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.12);
  color: var(--white);
  font-family: var(--font-cn);
  font-size: 14px;
  padding: 12px 14px;
  outline: none;
  transition: border-color .2s, background .2s;
  -webkit-appearance: none;
  border-radius: 0;
}
.form-field input::placeholder,
.form-field textarea::placeholder {
  color: rgba(255,255,255,.2);
  font-size: 13px;
}
.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
  border-color: var(--red);
  background: rgba(255,255,255,.08);
}
.form-field select { color: rgba(255,255,255,.5); cursor: pointer; }
.form-field select option { background: var(--dark-2); color: var(--white); }
.form-field textarea { resize: vertical; min-height: 110px; }

.form-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  padding-top: 4px;
}
.form-note {
  font-family: var(--font-cn);
  font-size: 12px;
  color: rgba(255,255,255,.25);
}
.btn-submit {
  padding: 12px 28px;
  background: var(--red);
  color: var(--white);
  font-family: var(--font-cn);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: .04em;
  cursor: pointer;
  border: none;
  transition: background .2s;
}
.btn-submit:hover { background: var(--red-dark); }
.form-success {
  display: none;
  padding: 20px;
  border: 1px solid rgba(232,0,28,.4);
  background: rgba(232,0,28,.08);
  color: var(--red);
  font-family: var(--font-cn);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: .04em;
  margin-top: 16px;
}
.form-success.show { display: block; }


/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  background: var(--dark);
  border-top: 1px solid var(--dark-3);
}
.footer-top {
  padding: 64px 0 48px;
  display: grid;
  grid-template-columns: 1.8fr 1fr 1fr 1fr;
  gap: 48px;
  border-bottom: 1px solid rgba(255,255,255,.07);
}
.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.footer-brand p {
  font-family: var(--font-cn);
  font-size: .875rem;
  line-height: 1.8;
  color: rgba(255,255,255,.35);
  max-width: 260px;
}
.footer-col h4 {
  font-family: var(--font-body);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: rgba(255,255,255,.3);
  margin-bottom: 18px;
}
.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-col li, .footer-col a {
  font-family: var(--font-cn);
  font-size: .875rem;
  color: rgba(255,255,255,.45);
  transition: color .2s;
  line-height: 1.5;
}
.footer-col a:hover { color: var(--white); }

.footer-bottom {
  padding: 20px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-bottom span {
  font-family: var(--font-cn);
  font-size: 12px;
  color: rgba(255,255,255,.22);
}
.footer-links {
  display: flex;
  gap: 24px;
}
.footer-links a {
  font-family: var(--font-cn);
  font-size: 12px;
  color: rgba(255,255,255,.25);
  transition: color .2s;
}
.footer-links a:hover { color: rgba(255,255,255,.7); }


/* ============================================================
   REVEAL ANIMATION
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .65s var(--ease), transform .65s var(--ease);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-d1 { transition-delay: .1s; }
.reveal-d2 { transition-delay: .2s; }
.reveal-d3 { transition-delay: .3s; }


/* ============================================================
   BACK TO TOP
   ============================================================ */
#backToTop {
  position: fixed;
  bottom: 36px;
  right: 36px;
  width: 52px;
  height: 52px;
  background: var(--red);
  border: none;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 50;
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px);
  transition: opacity .3s, visibility .3s, transform .3s, background .2s, box-shadow .2s;
  box-shadow: 0 4px 16px rgba(232,0,28,.35);
}
#backToTop svg { width: 20px; height: 20px; stroke-width: 2.5; }
#backToTop:hover {
  background: var(--red-dark);
  box-shadow: 0 6px 24px rgba(232,0,28,.5);
  transform: translateY(-2px);
}
#backToTop.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
#backToTop.visible:hover { transform: translateY(-2px); }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1200px) {
  .container, .header-inner { padding-left: 32px; padding-right: 32px; }
  .hero-content { padding-left: 32px; padding-right: 32px; gap: 48px; }
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .cases-grid { grid-template-columns: repeat(3, 1fr); }
  .case-featured { grid-column: span 2; grid-row: span 1; }
  .case-featured .case-img .img-placeholder { min-height: 280px !important; height: 280px !important; }
  .footer-top { grid-template-columns: 1fr 1fr; gap: 32px; }
  .why-grid { grid-template-columns: repeat(2, 1fr); }
  .why-card:nth-child(2) { border-right: none; }
  .why-card:nth-child(3) { border-top: 1px solid var(--border); border-right: 1px solid var(--border); }
  .why-card:nth-child(4) { border-top: 1px solid var(--border); border-right: none; }
  .section-header-row { grid-template-columns: 1fr; gap: 20px; }
  .scroll-hint { left: 32px; }
}

@media (max-width: 900px) {
  .container, .header-inner { padding-left: 24px; padding-right: 24px; }
  .hero-content { grid-template-columns: 1fr; padding: 60px 24px 80px; gap: 48px; }
  .hero-stat-card { left: 0; bottom: -20px; }
  .about-grid { grid-template-columns: 1fr; gap: 48px; }
  .about-images { order: -1; }
  .contact-grid { grid-template-columns: 1fr; gap: 48px; }
  .section { padding: 80px 0; }
  .scroll-hint { display: none; }
}

@media (max-width: 768px) {
  .main-nav, .btn-header { display: none; }
  .hamburger { display: flex; }
  .services-grid { grid-template-columns: 1fr; }
  .cases-grid { grid-template-columns: 1fr 1fr; }
  .case-featured { grid-column: span 2; }
  .footer-top { grid-template-columns: 1fr 1fr; }
  .why-grid { grid-template-columns: 1fr 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .header-inner { padding-left: 20px; padding-right: 20px; }
}

@media (max-width: 540px) {
  .container, .header-inner { padding-left: 20px; padding-right: 20px; }
  .hero-content { padding: 40px 20px 70px; }
  .hero-btns { flex-direction: column; align-items: flex-start; }
  .cases-grid { grid-template-columns: 1fr; }
  .case-featured { grid-column: span 1; }
  .footer-top { grid-template-columns: 1fr; }
  .why-grid { grid-template-columns: 1fr; }
  .why-card { border-right: none !important; border-top: 1px solid var(--border); }
  .why-card:first-child { border-top: none; }
  .about-figures { grid-template-columns: 1fr 1fr 1fr; }
  .hero-stat-card { position: static; margin-top: 20px; }
  .mobile-panel { padding: 32px 20px; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}