/* =============================================
   AIRVENT.MD — MAIN STYLESHEET
   ============================================= */

/* VARIABLES */
:root {
  --blue:       #1a6fb5;
  --blue-dark:  #0f4e87;
  --blue-light: #e8f4fd;
  --blue-mid:   #4a9fd4;
  --dark:       #0d1117;
  --dark-2:     #161b22;
  --dark-3:     #1c2230;
  --text:       #1a1a1a;
  --text-2:     #555;
  --text-3:     #888;
  --border:     #e5e7eb;
  --white:      #ffffff;
  --success:    #22c55e;
  --radius:     12px;
  --radius-lg:  20px;
  --shadow:     0 4px 24px rgba(26,111,181,0.10);
  --shadow-lg:  0 12px 40px rgba(26,111,181,0.18);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* RESET */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: 'Inter', system-ui, sans-serif; color: var(--text); background: var(--white); overflow-x: hidden; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { font-family: inherit; cursor: pointer; }

/* =============================================
   LOADER
   ============================================= */
.loader {
  position: fixed; inset: 0; background: var(--dark);
  display: flex; align-items: center; justify-content: center;
  z-index: 9999; transition: opacity 0.5s, visibility 0.5s;
}
.loader.done { opacity: 0; visibility: hidden; }
.loader__inner { text-align: center; }
.loader__logo {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 48px; letter-spacing: 4px; color: #fff;
  margin-bottom: 24px; opacity: 0; animation: loaderFade 0.5s 0.2s forwards;
}
.loader__bar {
  width: 200px; height: 3px; background: rgba(255,255,255,0.1);
  border-radius: 2px; overflow: hidden;
}
.loader__fill {
  height: 100%; width: 0; background: var(--blue-mid);
  animation: loaderBar 1.2s 0.3s ease-out forwards;
}
@keyframes loaderFade { to { opacity: 1; } }
@keyframes loaderBar  { to { width: 100%; } }

/* =============================================
   LAYOUT
   ============================================= */
.container { max-width: 1160px; margin: 0 auto; padding: 0 24px; }
.section    { padding: 88px 0; }

.section__head { text-align: center; margin-bottom: 56px; }
.section__eyebrow {
  display: inline-block; font-size: 12px; font-weight: 600;
  letter-spacing: 2px; text-transform: uppercase; color: var(--blue);
  margin-bottom: 12px;
}
.section__title { font-size: 36px; font-weight: 700; color: var(--text); line-height: 1.2; margin-bottom: 12px; }
.section__sub   { font-size: 16px; color: var(--text-2); line-height: 1.6; }

/* =============================================
   REVEAL ANIMATION
   ============================================= */
.reveal {
  opacity: 0; transform: translateY(28px);
  transition: opacity 0.65s var(--transition), transform 0.65s var(--transition);
}
.reveal.visible { opacity: 1; transform: translateY(0); }

/* =============================================
   BUTTONS
   ============================================= */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 24px; border-radius: var(--radius); font-size: 15px; font-weight: 500;
  border: 1.5px solid transparent; transition: all var(--transition); white-space: nowrap;
}
.btn--primary    { background: var(--blue); color: #fff; border-color: var(--blue); }
.btn--primary:hover { background: var(--blue-dark); border-color: var(--blue-dark); transform: translateY(-1px); box-shadow: var(--shadow); }
.btn--outline    { background: transparent; color: var(--blue); border-color: var(--blue); }
.btn--outline:hover { background: var(--blue-light); transform: translateY(-1px); }
.btn--lg         { padding: 16px 32px; font-size: 16px; }
.btn--full       { width: 100%; justify-content: center; }
.btn--nav        { padding: 8px 18px; font-size: 13px; background: var(--blue); color: #fff; border-color: var(--blue); }
.btn--nav:hover  { background: var(--blue-dark); }
.btn--cart       { padding: 8px 16px; font-size: 13px; background: var(--blue); color: #fff; border-color: var(--blue); border-radius: 8px; }
.btn--cart:hover { background: var(--blue-dark); transform: translateY(-1px); }

.btn--hero-primary {
  padding: 16px 32px; font-size: 16px; background: var(--blue); color: #fff;
  border-color: var(--blue); border-radius: var(--radius);
}
.btn--hero-primary:hover { background: var(--blue-dark); transform: translateY(-2px); box-shadow: 0 8px 32px rgba(26,111,181,0.35); }
.btn--hero-outline {
  padding: 16px 32px; font-size: 16px; background: rgba(255,255,255,0.08);
  color: #fff; border-color: rgba(255,255,255,0.3); border-radius: var(--radius); backdrop-filter: blur(4px);
}
.btn--hero-outline:hover { background: rgba(255,255,255,0.15); border-color: rgba(255,255,255,0.5); }

/* =============================================
   NAVIGATION
   ============================================= */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,0.95); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow var(--transition);
}
.nav.scrolled { box-shadow: 0 2px 20px rgba(0,0,0,0.08); }
.nav__inner    { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.nav__logo     { display: flex; align-items: center; gap: 10px; font-family: 'Bebas Neue', sans-serif; font-size: 24px; letter-spacing: 2px; color: var(--dark); }
.nav__logo-icon { color: var(--blue); }
.nav__logo-md   { color: var(--blue); }
.nav__links     { display: flex; align-items: center; gap: 6px; }
.nav__link      { padding: 8px 12px; font-size: 14px; color: var(--text-2); border-radius: 8px; transition: all var(--transition); }
.nav__link:hover { color: var(--blue); background: var(--blue-light); }
.nav__burger    { display: none; flex-direction: column; gap: 5px; background: none; border: none; padding: 8px; }
.nav__burger span { display: block; width: 22px; height: 2px; background: var(--text); border-radius: 2px; transition: all var(--transition); }
.nav__burger.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav__burger.open span:nth-child(2) { opacity: 0; }
.nav__burger.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* =============================================
   HERO
   ============================================= */
.hero {
  position: relative; min-height: 100vh; display: flex; align-items: center;
  background: var(--dark); overflow: hidden; padding: 120px 0 80px;
}
.hero__bg     { position: absolute; inset: 0; }
.hero__grid   {
  position: absolute; inset: 0;
  background-image: linear-gradient(rgba(26,111,181,0.07) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(26,111,181,0.07) 1px, transparent 1px);
  background-size: 60px 60px;
  animation: gridMove 20s linear infinite;
}
@keyframes gridMove { to { transform: translateY(60px); } }

.hero__particles { position: absolute; inset: 0; }

.hero__content  { position: relative; z-index: 1; max-width: 820px; }
.hero__badge    {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(26,111,181,0.2); border: 1px solid rgba(74,159,212,0.3);
  color: #7ec8f0; font-size: 13px; font-weight: 500;
  padding: 6px 16px; border-radius: 100px; margin-bottom: 28px;
  backdrop-filter: blur(4px);
}
.hero__title    { margin-bottom: 24px; }
.hero__title-line {
  display: block; font-family: 'Bebas Neue', sans-serif;
  font-size: clamp(48px, 8vw, 88px); letter-spacing: 2px;
  color: #fff; line-height: 1;
  animation: slideUp 0.7s both;
}
.hero__title-line:nth-child(2) { animation-delay: 0.1s; }
.hero__title-line:nth-child(3) { animation-delay: 0.2s; }
.hero__title-accent { color: var(--blue-mid); }
@keyframes slideUp { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }

.hero__sub      { font-size: 18px; color: rgba(255,255,255,0.65); line-height: 1.6; margin-bottom: 36px; max-width: 560px; }
.hero__actions  { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 64px; }

.hero__stats    { display: flex; gap: 40px; flex-wrap: wrap; }
.hero__stat     { border-left: 2px solid rgba(74,159,212,0.4); padding-left: 16px; }
.hero__stat-num { font-family: 'Bebas Neue', sans-serif; font-size: 36px; letter-spacing: 1px; color: #fff; line-height: 1; }
.hero__stat-lbl { font-size: 12px; color: rgba(255,255,255,0.45); margin-top: 2px; }

.hero__scroll   { position: absolute; bottom: 36px; left: 50%; transform: translateX(-50%); text-align: center; }
.hero__scroll span { display: block; font-size: 11px; letter-spacing: 2px; text-transform: uppercase; color: rgba(255,255,255,0.3); margin-bottom: 8px; }
.hero__scroll-line {
  width: 1px; height: 40px; background: linear-gradient(to bottom, rgba(255,255,255,0.3), transparent);
  margin: 0 auto; animation: scrollLine 1.5s ease-in-out infinite;
}
@keyframes scrollLine { 0%,100% { opacity: 0.3; transform: scaleY(0.8); } 50% { opacity: 1; transform: scaleY(1); } }

/* =============================================
   CLIENTS BAR
   ============================================= */
.clients { padding: 24px 0; background: var(--blue-light); border-bottom: 1px solid #c5dff5; }
.clients__inner { display: flex; align-items: center; gap: 24px; flex-wrap: wrap; }
.clients__label { font-size: 12px; font-weight: 600; letter-spacing: 1.5px; text-transform: uppercase; color: var(--blue); white-space: nowrap; }
.clients__tags  { display: flex; gap: 10px; flex-wrap: wrap; }
.clients__tag   {
  background: #fff; border: 1px solid #c5dff5; color: var(--text-2);
  font-size: 13px; padding: 6px 14px; border-radius: 100px;
  transition: all var(--transition);
}
.clients__tag:hover { border-color: var(--blue); color: var(--blue); transform: translateY(-1px); }

/* =============================================
   PRODUCTS GRID
   ============================================= */
.products__grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
}
.product-card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 28px; transition: all var(--transition); position: relative; overflow: hidden;
}
.product-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--blue), var(--blue-mid));
  transform: scaleX(0); transform-origin: left; transition: transform var(--transition);
}
.product-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: #b5d4f4; }
.product-card:hover::before { transform: scaleX(1); }

.product-card__img { height: 90px; display: flex; align-items: center; justify-content: center; margin-bottom: 16px; }
.product-card__img svg { width: 120px; height: 80px; }
.product-card h3 { font-size: 16px; font-weight: 600; margin-bottom: 8px; }
.product-card p  { font-size: 14px; color: var(--text-2); line-height: 1.5; margin-bottom: 16px; }
.product-card__link { font-size: 13px; font-weight: 500; color: var(--blue); transition: gap var(--transition); }
.product-card__link:hover { text-decoration: underline; }

.product-card--custom { background: linear-gradient(135deg, var(--blue), var(--blue-dark)); border-color: transparent; }
.product-card--custom h3 { color: #fff; }
.product-card--custom p  { color: rgba(255,255,255,0.75); }
.product-card--custom .product-card__img svg { opacity: 0.8; }
.product-card--custom::before { background: rgba(255,255,255,0.3); }
.product-card__link--white { color: rgba(255,255,255,0.9); }

/* =============================================
   WHY SECTION
   ============================================= */
.why { padding: 88px 0; background: #f8fafd; }
.why__inner { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }
.why__list  { display: flex; flex-direction: column; gap: 24px; margin-top: 32px; }
.why__item  { display: flex; gap: 16px; align-items: flex-start; }
.why__item-icon { font-size: 24px; flex-shrink: 0; width: 48px; text-align: center; }
.why__item strong { display: block; font-size: 15px; font-weight: 600; margin-bottom: 4px; }
.why__item p { font-size: 14px; color: var(--text-2); line-height: 1.5; }

.why__visual { text-align: center; }
.why__big-stat {
  background: var(--blue); border-radius: var(--radius-lg);
  padding: 48px; margin-bottom: 24px; display: inline-block; min-width: 220px;
}
.why__big-num { font-family: 'Bebas Neue', sans-serif; font-size: 80px; letter-spacing: 2px; color: #fff; line-height: 1; }
.why__big-lbl { font-size: 16px; color: rgba(255,255,255,0.7); margin-top: 4px; }
.why__badges  { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; }
.why__badge   {
  background: #fff; border: 1px solid var(--border); border-radius: 100px;
  font-size: 13px; padding: 8px 16px; color: var(--text-2);
  transition: all var(--transition);
}
.why__badge:hover { border-color: var(--blue); color: var(--blue); }

/* =============================================
   CATALOG
   ============================================= */
.catalog__filters { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 32px; }
.filter__btn {
  padding: 8px 18px; font-size: 14px; border-radius: 100px;
  border: 1.5px solid var(--border); background: #fff; color: var(--text-2);
  transition: all var(--transition);
}
.filter__btn:hover       { border-color: var(--blue); color: var(--blue); }
.filter__btn--active     { background: var(--blue); color: #fff; border-color: var(--blue); }

.catalog__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }

.catalog-item {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg);
  overflow: hidden; transition: all var(--transition); position: relative;
}
.catalog-item:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: #b5d4f4; }
.catalog-item.hidden { display: none; }

.catalog-item__badge {
  position: absolute; top: 12px; right: 12px;
  font-size: 11px; font-weight: 600; padding: 3px 10px; border-radius: 100px;
}
.catalog-item__badge--stock { background: #dcfce7; color: #166534; }
.catalog-item__badge--order { background: #fef9c3; color: #854d0e; }

.catalog-item__img {
  height: 140px; background: #f8fafd;
  display: flex; align-items: center; justify-content: center; padding: 20px;
}
.catalog-item__img svg { width: 160px; height: 120px; }

.catalog-item__info { padding: 20px; }
.catalog-item__cat  { font-size: 11px; font-weight: 600; letter-spacing: 1.5px; text-transform: uppercase; color: var(--text-3); margin-bottom: 6px; }
.catalog-item__info h3 { font-size: 16px; font-weight: 600; margin-bottom: 10px; }
.catalog-item__specs { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 16px; }
.catalog-item__specs span { font-size: 12px; background: var(--blue-light); color: var(--blue); padding: 3px 10px; border-radius: 100px; }
.catalog-item__price-row { display: flex; align-items: center; justify-content: space-between; }
.catalog-item__price { font-size: 22px; font-weight: 700; color: var(--blue); }
.catalog-item__price span { font-size: 14px; font-weight: 400; color: var(--text-3); }

.catalog__more { text-align: center; margin-top: 40px; }

/* =============================================
   PRODUCTION
   ============================================= */
.production {
  padding: 88px 0;
  background: linear-gradient(135deg, var(--dark) 0%, var(--dark-3) 100%);
}
.production .section__head { margin-bottom: 56px; }
.production__steps {
  display: flex; align-items: flex-start; justify-content: center; gap: 0; flex-wrap: wrap;
}
.production__step {
  background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-lg); padding: 32px 24px; text-align: center;
  flex: 1; min-width: 160px; max-width: 200px;
  transition: all var(--transition);
}
.production__step:hover { background: rgba(26,111,181,0.15); border-color: rgba(74,159,212,0.3); transform: translateY(-4px); }
.production__step-num { font-family: 'Bebas Neue', sans-serif; font-size: 48px; color: rgba(74,159,212,0.25); line-height: 1; }
.production__step-icon { font-size: 32px; margin: 8px 0; }
.production__step h3 { font-size: 15px; font-weight: 600; color: #fff; margin-bottom: 8px; }
.production__step p  { font-size: 13px; color: rgba(255,255,255,0.45); line-height: 1.5; }
.production__arrow { font-size: 20px; color: rgba(74,159,212,0.3); align-self: center; padding: 0 4px; flex-shrink: 0; }

/* =============================================
   CALCULATOR
   ============================================= */
.calc-wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; max-width: 900px; margin: 0 auto; }
.calc-form { background: #f8fafd; border-radius: var(--radius-lg); padding: 36px; }
.calc-form__row { margin-bottom: 24px; }
.calc-form__field { display: flex; flex-direction: column; gap: 10px; }
.calc-form__field label { font-size: 14px; font-weight: 500; color: var(--text); }

.btn-toggle { display: flex; border: 1.5px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.btn-toggle__item { flex: 1; padding: 10px; font-size: 14px; background: #fff; color: var(--text-2); border: none; transition: all var(--transition); }
.btn-toggle__item--active { background: var(--blue); color: #fff; }

.slider {
  -webkit-appearance: none; appearance: none;
  width: 100%; height: 5px; border-radius: 5px;
  background: linear-gradient(to right, var(--blue) 0%, var(--blue) var(--val, 15%), #e5e7eb var(--val, 15%));
  outline: none; cursor: pointer;
}
.slider::-webkit-slider-thumb {
  -webkit-appearance: none; width: 22px; height: 22px; border-radius: 50%;
  background: var(--white); border: 3px solid var(--blue);
  box-shadow: 0 0 0 3px rgba(26,111,181,0.15); cursor: pointer; transition: box-shadow var(--transition);
}
.slider::-webkit-slider-thumb:hover { box-shadow: 0 0 0 6px rgba(26,111,181,0.2); }
.slider__marks { display: flex; justify-content: space-between; font-size: 11px; color: var(--text-3); margin-top: 4px; }

.select {
  width: 100%; padding: 11px 14px; border: 1.5px solid var(--border); border-radius: var(--radius);
  font-size: 15px; font-family: inherit; color: var(--text); background: #fff; cursor: pointer; outline: none;
  transition: border-color var(--transition);
}
.select:focus { border-color: var(--blue); }

.calc-result {
  background: var(--dark); border-radius: var(--radius-lg); padding: 36px;
  display: flex; flex-direction: column; gap: 0;
}
.calc-result__header { font-size: 13px; font-weight: 600; letter-spacing: 1.5px; text-transform: uppercase; color: rgba(255,255,255,0.4); margin-bottom: 24px; }
.calc-result__line   { display: flex; justify-content: space-between; padding: 10px 0; border-bottom: 1px solid rgba(255,255,255,0.07); }
.calc-result__line span  { font-size: 14px; color: rgba(255,255,255,0.45); }
.calc-result__line strong { font-size: 14px; color: #fff; }
.calc-result__divider { height: 1px; background: rgba(255,255,255,0.1); margin: 20px 0; }
.calc-result__lbl   { font-size: 13px; color: rgba(255,255,255,0.45); margin-bottom: 8px; }
.calc-result__price { font-family: 'Bebas Neue', sans-serif; font-size: 48px; letter-spacing: 1px; color: #fff; margin-bottom: 4px; }
.calc-result__note  { font-size: 12px; color: rgba(255,255,255,0.3); margin-bottom: 24px; }
.calc-result .btn--primary { margin-top: auto; }

/* =============================================
   PROJECTS
   ============================================= */
.projects__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.project-card   { border-radius: var(--radius-lg); overflow: hidden; cursor: pointer; }
.project-card--large { grid-column: span 1; grid-row: span 2; }
.project-card__img {
  height: 200px; position: relative;
  transition: transform 0.5s ease;
}
.project-card--large .project-card__img { height: 100%; min-height: 420px; }
.project-card:hover .project-card__img  { transform: scale(1.02); }
.project-card__img--1 { background: linear-gradient(135deg, #1a3a5c, #2a6fb5); }
.project-card__img--2 { background: linear-gradient(135deg, #1a4a2c, #2a8b55); }
.project-card__img--3 { background: linear-gradient(135deg, #3a2a1a, #8b6b2a); }
.project-card__img--4 { background: linear-gradient(135deg, #2a1a3c, #6b2a8b); }
.project-card__overlay {
  position: absolute; bottom: 0; left: 0; right: 0;
  padding: 24px; background: linear-gradient(to top, rgba(0,0,0,0.8), transparent);
  transform: translateY(8px); transition: transform var(--transition);
}
.project-card:hover .project-card__overlay { transform: translateY(0); }
.project-card__tag { display: inline-block; background: rgba(26,111,181,0.7); color: #7ec8f0; font-size: 11px; font-weight: 600; letter-spacing: 1px; text-transform: uppercase; padding: 4px 10px; border-radius: 100px; margin-bottom: 8px; backdrop-filter: blur(4px); }
.project-card__overlay h3 { font-size: 16px; font-weight: 600; color: #fff; margin-bottom: 6px; }
.project-card__overlay p  { font-size: 13px; color: rgba(255,255,255,0.65); }

/* =============================================
   REVIEWS
   ============================================= */
.reviews__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.review-card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 28px;
  transition: all var(--transition);
}
.review-card:hover { box-shadow: var(--shadow); transform: translateY(-2px); }
.review-card__stars { font-size: 18px; color: #f59e0b; margin-bottom: 16px; }
.review-card p { font-size: 15px; color: var(--text-2); line-height: 1.65; margin-bottom: 20px; font-style: italic; }
.review-card__author { display: flex; align-items: center; gap: 12px; }
.review-card__avatar {
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--blue-light); color: var(--blue);
  display: flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 600; flex-shrink: 0;
}
.review-card__author strong { display: block; font-size: 14px; font-weight: 600; }
.review-card__author span   { font-size: 12px; color: var(--text-3); }

/* =============================================
   CONTACT
   ============================================= */
.contact { padding: 88px 0; background: linear-gradient(135deg, var(--dark) 0%, var(--dark-3) 100%); }
.contact__inner { display: grid; grid-template-columns: 1fr 1.2fr; gap: 64px; align-items: start; }

.contact__ways { display: flex; flex-direction: column; gap: 16px; margin-top: 32px; }
.contact__way  {
  display: flex; align-items: center; gap: 16px;
  padding: 16px; border-radius: var(--radius); border: 1px solid rgba(255,255,255,0.06);
  transition: all var(--transition);
}
.contact__way:hover { background: rgba(255,255,255,0.05); border-color: rgba(74,159,212,0.3); }
.contact__way-icon { font-size: 22px; width: 40px; text-align: center; flex-shrink: 0; }
.contact__way-lbl  { font-size: 12px; color: rgba(255,255,255,0.4); margin-bottom: 2px; }
.contact__way-val  { font-size: 15px; color: #fff; font-weight: 500; }

.contact__form {
  background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-lg); padding: 40px;
}
.contact__form h3 { font-size: 22px; font-weight: 600; color: #fff; margin-bottom: 28px; }

.form__row   { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 16px; }
.form__field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 16px; }
.form__field label { font-size: 13px; font-weight: 500; color: rgba(255,255,255,0.6); }
.form__field input, .form__field textarea {
  width: 100%; padding: 12px 16px;
  background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius); font-size: 15px; font-family: inherit;
  color: #fff; outline: none; transition: border-color var(--transition);
}
.form__field input::placeholder, .form__field textarea::placeholder { color: rgba(255,255,255,0.25); }
.form__field input:focus, .form__field textarea:focus { border-color: rgba(74,159,212,0.5); background: rgba(255,255,255,0.08); }
.form__field input.error, .form__field textarea.error { border-color: rgba(239,68,68,0.6); }
.form__field textarea { resize: vertical; }
.form__field .select { background: rgba(255,255,255,0.06); border-color: rgba(255,255,255,0.1); color: #fff; }
.form__field .select option { background: var(--dark-2); color: #fff; }
.form__error   { font-size: 12px; color: #ef4444; display: none; }
.form__error.visible { display: block; }
.form__success {
  display: none; margin-top: 16px; padding: 14px 18px;
  background: rgba(34,197,94,0.1); border: 1px solid rgba(34,197,94,0.3);
  color: #86efac; border-radius: var(--radius); font-size: 14px;
}
.form__success.visible { display: block; }

/* =============================================
   FOOTER
   ============================================= */
.footer { background: var(--dark); padding: 60px 0 0; border-top: 1px solid rgba(255,255,255,0.06); }
.footer__inner {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; padding-bottom: 48px;
}
.footer__logo { font-family: 'Bebas Neue', sans-serif; font-size: 28px; letter-spacing: 2px; color: #fff; margin-bottom: 12px; }
.footer__logo span { color: var(--blue-mid); }
.footer__brand p   { font-size: 14px; color: rgba(255,255,255,0.35); line-height: 1.6; }
.footer__col       { display: flex; flex-direction: column; gap: 10px; }
.footer__col-title { font-size: 12px; font-weight: 600; letter-spacing: 1.5px; text-transform: uppercase; color: rgba(255,255,255,0.35); margin-bottom: 4px; }
.footer__col a, .footer__col span { font-size: 14px; color: rgba(255,255,255,0.55); transition: color var(--transition); }
.footer__col a:hover { color: #fff; }
.footer__bottom {
  display: flex; justify-content: space-between; align-items: center;
  padding: 20px 0; border-top: 1px solid rgba(255,255,255,0.06);
  font-size: 13px; color: rgba(255,255,255,0.25);
}

/* =============================================
   BACK TO TOP + FLOAT BTNS
   ============================================= */
.back-to-top {
  position: fixed; bottom: 100px; right: 24px; z-index: 50;
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--blue); color: #fff; border: none;
  font-size: 18px; box-shadow: var(--shadow);
  opacity: 0; visibility: hidden; transition: all var(--transition);
}
.back-to-top.visible { opacity: 1; visibility: visible; }
.back-to-top:hover   { background: var(--blue-dark); transform: translateY(-2px); }

.float-btns { position: fixed; bottom: 24px; right: 24px; z-index: 50; display: flex; flex-direction: column; gap: 10px; }
.float-btn  {
  width: 52px; height: 52px; border-radius: 50%; display: flex; align-items: center; justify-content: center;
  box-shadow: 0 4px 16px rgba(0,0,0,0.2); transition: all var(--transition);
}
.float-btn:hover { transform: translateY(-2px) scale(1.05); }
.float-btn--wa    { background: #25D366; color: #fff; }
.float-btn--phone { background: var(--blue); color: #fff; }

/* =============================================
   PARTICLES (canvas via JS)
   ============================================= */
#particles canvas { position: absolute; inset: 0; }

/* =============================================
   RESPONSIVE
   ============================================= */
@media (max-width: 1024px) {
  .products__grid   { grid-template-columns: repeat(2, 1fr); }
  .catalog__grid    { grid-template-columns: repeat(2, 1fr); }
  .why__inner       { grid-template-columns: 1fr; gap: 40px; }
  .why__visual      { display: none; }
  .contact__inner   { grid-template-columns: 1fr; }
  .footer__inner    { grid-template-columns: 1fr 1fr; }
  .production__steps { gap: 8px; }
  .production__step  { min-width: 130px; }
}

@media (max-width: 768px) {
  .hero__title-line { font-size: clamp(40px, 12vw, 64px); }
  .hero__stats { gap: 20px; }
  .section { padding: 56px 0; }
  .section__title { font-size: 28px; }

  .products__grid  { grid-template-columns: 1fr; }
  .catalog__grid   { grid-template-columns: 1fr; }
  .projects__grid  { grid-template-columns: 1fr; }
  .reviews__grid   { grid-template-columns: 1fr; }
  .project-card--large { grid-row: auto; }
  .calc-wrap       { grid-template-columns: 1fr; }

  .production__steps { flex-direction: column; align-items: center; }
  .production__arrow { transform: rotate(90deg); }
  .production__step  { max-width: 100%; width: 100%; }

  .nav__links { display: none; position: fixed; top: 68px; left: 0; right: 0; bottom: 0; background: rgba(255,255,255,0.98); backdrop-filter: blur(12px); flex-direction: column; padding: 24px; gap: 8px; overflow-y: auto; z-index: 99; }
  .nav__links.open { display: flex; }
  .nav__burger { display: flex; }

  .footer__inner  { grid-template-columns: 1fr; }
  .footer__bottom { flex-direction: column; gap: 8px; text-align: center; }
  .form__row { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .hero__actions { flex-direction: column; }
  .hero__actions .btn { width: 100%; justify-content: center; }
  .clients__inner { flex-direction: column; align-items: flex-start; }
}