/* ============================================================
   Kyiv PTS Centre — Main Stylesheet
   ============================================================ */

/* ---- CSS Custom Properties ---- */
:root {
  --color-primary: #1a5fa8;
  --color-primary-dark: #134a87;
  --color-primary-light: #2a7fd4;
  --color-accent: #f0a500;
  --color-text: #1e2a3a;
  --color-text-muted: #5a6a7a;
  --color-bg: #ffffff;
  --color-bg-gray: #f4f7fb;
  --color-bg-dark: #0f1e35;
  --color-border: #dde4ee;
  --color-success: #22c55e;
  --color-error: #ef4444;

  --font-base: 'Inter', system-ui, -apple-system, sans-serif;
  --font-heading: 'Montserrat', 'Inter', system-ui, sans-serif;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,.1);
  --shadow-lg: 0 12px 40px rgba(0,0,0,.14);

  --transition: 0.25s ease;
  --container-max: 1200px;
  --container-pad: clamp(1rem, 4vw, 2.5rem);

  --header-h: 70px;
}

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

/* ---- Container ---- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
}

/* ============================================================
   TYPOGRAPHY
   ============================================================ */
h1, h2, h3, h4, h5 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text);
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  transition: background var(--transition), color var(--transition),
              border-color var(--transition), transform var(--transition),
              box-shadow var(--transition);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}
.btn:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
}
.btn--primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: 0 4px 14px rgba(26, 95, 168, .35);
}
.btn--primary:hover {
  background: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(26, 95, 168, .45);
}
.btn--outline-light {
  background: transparent;
  color: #fff;
  border: 2px solid rgba(255,255,255,.7);
}
.btn--outline-light:hover {
  background: rgba(255,255,255,.15);
  border-color: #fff;
}
.btn--lg { padding: 15px 36px; font-size: 1.05rem; }
.btn--full { width: 100%; }
.btn__spinner {
  width: 18px; height: 18px;
  border: 2px solid rgba(255,255,255,.4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ============================================================
   HEADER
   ============================================================ */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--header-h);
  z-index: 1000;
  background: rgba(255,255,255,.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.header.scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: 0 2px 20px rgba(0,0,0,.08);
}
.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
}

/* Logo */
.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-text);
  transition: opacity var(--transition);
}
.logo:hover { opacity: .85; }
.logo--white .logo__text { color: #fff; }
.logo__icon { flex-shrink: 0; }

/* Navigation */
.nav__list {
  display: flex;
  gap: 8px;
  align-items: center;
}
.nav__link {
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  transition: color var(--transition), background var(--transition);
}
.nav__link:hover,
.nav__link.active { color: var(--color-primary); background: var(--color-bg-gray); }
.nav__link--cta {
  background: var(--color-primary);
  color: #fff !important;
  padding: 9px 20px;
  font-size: 0.9rem;
}
.nav__link--cta:hover { background: var(--color-primary-dark); }

/* Burger */
.burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 6px;
  border-radius: var(--radius-sm);
}
.burger span {
  display: block;
  width: 22px; height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
.burger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.burger.open span:nth-child(2) { opacity: 0; }
.burger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 768px) {
  .burger { display: flex; }
  .nav {
    position: fixed;
    top: var(--header-h); left: 0; right: 0;
    background: #fff;
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 8px 24px rgba(0,0,0,.1);
    z-index: 999;
    /* max-height toggle — reliable on iOS Safari, no transform glitches */
    max-height: 0;
    overflow: hidden;
    padding: 0 var(--container-pad);
    transition: max-height 0.35s ease, padding 0.35s ease,
                border-bottom-color 0.35s ease;
    border-bottom-color: transparent;
  }
  .nav.open {
    max-height: 420px;
    padding: 1.5rem var(--container-pad);
    border-bottom-color: var(--color-border);
  }
  .nav__list { flex-direction: column; align-items: flex-start; gap: 4px; }
  .nav__link { display: block; width: 100%; padding: 12px 16px; font-size: 1rem; }
  .nav__link--cta { text-align: center; }
}

/* Fix logo overflow on very small screens */
@media (max-width: 400px) {
  .logo__text { font-size: 0.92rem; }
  .logo__icon svg { width: 28px; height: 28px; }
  .logo { gap: 7px; }
  .header__inner { gap: 8px; }
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: calc(var(--header-h) + 2rem) var(--container-pad) 5rem;
  overflow: hidden;
  color: #fff;
}
.hero__bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, #0c2d5c 0%, #1a5fa8 50%, #0e3f7a 100%);
  z-index: 0;
}
.hero__bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(255,255,255,.06) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 20%, rgba(240,165,0,.12) 0%, transparent 50%);
}
/* Decorative animated circles */
.hero__bg::before {
  content: '';
  position: absolute;
  width: 600px; height: 600px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,.08);
  top: -150px; right: -150px;
  animation: heroRotate 30s linear infinite;
}
@keyframes heroRotate { to { transform: rotate(360deg); } }

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 820px;
  text-align: center;
}
.hero__badge {
  display: inline-block;
  background: rgba(255,255,255,.15);
  border: 1px solid rgba(255,255,255,.25);
  color: rgba(255,255,255,.9);
  padding: 6px 18px;
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 1.5rem;
  backdrop-filter: blur(4px);
}
.hero__title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3.6rem);
  font-weight: 800;
  color: #fff;
  margin-bottom: 1.25rem;
  text-shadow: 0 2px 20px rgba(0,0,0,.2);
}
.hero__subtitle {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: rgba(255,255,255,.82);
  max-width: 640px;
  margin: 0 auto 2.5rem;
  line-height: 1.7;
}
.hero__actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 3.5rem;
}
.hero__stats {
  display: flex;
  gap: 3rem;
  justify-content: center;
  flex-wrap: wrap;
  border-top: 1px solid rgba(255,255,255,.15);
  padding-top: 2rem;
}
.hero__stat { text-align: center; }
.hero__stat-num {
  display: block;
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1;
}
.hero__stat-label {
  display: block;
  font-size: 0.85rem;
  color: rgba(255,255,255,.7);
  margin-top: 4px;
}
.hero__scroll {
  position: absolute;
  bottom: 2rem; left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px; height: 44px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,.3);
  color: #fff;
  transition: background var(--transition);
  animation: bounce 2s ease-in-out infinite;
}
.hero__scroll:hover { background: rgba(255,255,255,.15); }
@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(6px); }
}

/* ============================================================
   SECTIONS
   ============================================================ */
.section {
  padding: clamp(3rem, 8vw, 6rem) 0;
}
.section--gray { background: var(--color-bg-gray); }

.section__header { max-width: 700px; margin-bottom: 3rem; }
.section__header--center { text-align: center; margin-left: auto; margin-right: auto; }
.section__eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
}
.section__title {
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  margin-bottom: 1rem;
}
.section__desc {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* ============================================================
   ABOUT
   ============================================================ */
.about { background: var(--color-bg); }
.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}
@media (max-width: 900px) {
  .about__grid { grid-template-columns: 1fr; gap: 2.5rem; }
}
.about__text p {
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-bottom: 1.25rem;
}
.about__text strong { color: var(--color-text); }
.about__text .btn { margin-top: 0.5rem; }

.about__cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
@media (max-width: 480px) {
  .about__cards { grid-template-columns: 1fr; }
}

.about__card {
  padding: 1.5rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}
.about__card--blue {
  background: linear-gradient(135deg, #e8f0fc 0%, #d4e4f7 100%);
  border-color: #bdd2ef;
}
.about__card--gray {
  background: var(--color-bg-gray);
}
.about__card-icon {
  color: var(--color-primary);
  margin-bottom: 0.75rem;
}
.about__card h3 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
}
.about__card p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ============================================================
   PRODUCTS
   ============================================================ */
.products { background: var(--color-bg-gray); }
.products__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.product-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  position: relative;
  overflow: hidden;
}
.product-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-light);
}
.product-card--featured {
  background: linear-gradient(145deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: #fff;
  border-color: var(--color-primary);
}
.product-card--featured h3,
.product-card--featured p,
.product-card--featured li { color: rgba(255,255,255,.9); }
.product-card--featured .product-card__link { color: var(--color-accent); }

.product-card__badge {
  position: absolute;
  top: 1.25rem; right: 1.25rem;
  background: var(--color-accent);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 100px;
}

.product-card__icon {
  width: 64px; height: 64px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.product-card__icon--blue {
  background: linear-gradient(135deg, #e8f0fc, #d4e4f7);
  color: var(--color-primary);
}
.product-card__icon--white {
  background: rgba(255,255,255,.2);
  color: #fff;
}

.product-card__title {
  font-size: 1.1rem;
  font-weight: 700;
}
.product-card__desc {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}
.product-card--featured .product-card__desc { color: rgba(255,255,255,.8); }

.product-card__features {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.product-card__features li {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  padding-left: 1.2rem;
  position: relative;
}
.product-card__features li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: 700;
}
.product-card--featured .product-card__features li::before { color: var(--color-accent); }

.product-card__link {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-primary);
  transition: gap var(--transition);
  margin-top: auto;
}
.product-card__link:hover { text-decoration: underline; }

/* ============================================================
   SERVICES
   ============================================================ */
.services { background: #fff; }
.services__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}

.service-item {
  display: flex;
  gap: 1.25rem;
  padding: 1.5rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  transition: box-shadow var(--transition), transform var(--transition);
}
.service-item:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.service-item__num {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--color-primary);
  opacity: .25;
  flex-shrink: 0;
  line-height: 1;
  min-width: 2.5rem;
}
.service-item h3 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
}
.service-item p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.65;
}

/* ============================================================
   PROJECTS
   ============================================================ */
.projects { background: var(--color-bg-dark); color: #fff; }
.projects .section__eyebrow { color: var(--color-accent); }
.projects .section__title { color: #fff; }
.projects .section__desc { color: rgba(255,255,255,.7); }

.projects__counters {
  display: flex;
  gap: 2rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 3.5rem;
}
.projects__counter {
  text-align: center;
  padding: 2rem 2.5rem;
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--radius-md);
  backdrop-filter: blur(4px);
  min-width: 160px;
  transition: background var(--transition);
}
.projects__counter:hover { background: rgba(255,255,255,.1); }
.projects__counter-num {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 3rem;
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1;
}
.projects__counter-plus {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-accent);
  vertical-align: top;
  margin-top: 2px;
}
.projects__counter-label {
  display: block;
  font-size: 0.85rem;
  color: rgba(255,255,255,.6);
  margin-top: 0.75rem;
  line-height: 1.4;
}

.projects__clients { text-align: center; }
.projects__clients-title {
  color: rgba(255,255,255,.6);
  font-size: 0.9rem;
  margin-bottom: 1rem;
  letter-spacing: .05em;
}
.projects__clients-list {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
}
.projects__client {
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.15);
  color: rgba(255,255,255,.8);
  padding: 8px 18px;
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 500;
  transition: background var(--transition);
}
.projects__client:hover { background: rgba(255,255,255,.15); }

/* ============================================================
   CONTACT
   ============================================================ */
.contact { background: var(--color-bg-gray); }
.contact__grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 3rem;
  align-items: start;
}
@media (max-width: 860px) {
  .contact__grid { grid-template-columns: 1fr; gap: 2rem; }
}

.contact__info h3 {
  font-size: 1.3rem;
  margin-bottom: 2rem;
}
.contact__item {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
  align-items: flex-start;
}
.contact__item-icon {
  width: 40px; height: 40px;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  flex-shrink: 0;
}
.contact__item-label {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 4px;
}
.contact__item-value {
  display: block;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text);
  line-height: 1.6;
  transition: color var(--transition);
}
.contact__item-value:hover { color: var(--color-primary); }

.contact__hours {
  margin-top: 2rem;
  padding: 1.25rem;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}
.contact__hours .contact__item-label { margin-bottom: 0.75rem; }
.contact__hours p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* Form */
.contact__form {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-sm);
}
.contact__form h3 {
  font-size: 1.2rem;
  margin-bottom: 1.75rem;
}

.form__group { margin-bottom: 1.25rem; }
.form__label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 6px;
}
.form__required { color: var(--color-error); }
.form__input {
  width: 100%;
  padding: 11px 14px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.925rem;
  color: var(--color-text);
  background: #fafcff;
  transition: border-color var(--transition), box-shadow var(--transition);
  appearance: none;
}
.form__input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(26,95,168,.12);
  background: #fff;
}
.form__input.error {
  border-color: var(--color-error);
  box-shadow: 0 0 0 3px rgba(239,68,68,.1);
}
.form__select { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%235a6a7a' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 14px center; padding-right: 36px; }
.form__textarea { resize: vertical; min-height: 110px; }
.form__error {
  display: block;
  font-size: 0.78rem;
  color: var(--color-error);
  margin-top: 4px;
  min-height: 1em;
}
/* Ensure [hidden] always wins regardless of display rules */
[hidden] { display: none !important; }

.form__success {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-top: 1rem;
  padding: 1rem 1.25rem;
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: #166534;
}
.form__success svg { flex-shrink: 0; color: var(--color-success); margin-top: 1px; }

/* ============================================================
   FOOTER
   ============================================================ */
.footer { background: var(--color-bg-dark); color: rgba(255,255,255,.7); }
.footer__inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
  padding-top: 3rem;
  padding-bottom: 3rem;
}
@media (max-width: 700px) {
  .footer__inner { grid-template-columns: 1fr; gap: 2rem; }
}
.footer__brand .logo { margin-bottom: 1rem; }
.footer__desc {
  font-size: 0.875rem;
  line-height: 1.7;
  color: rgba(255,255,255,.5);
  max-width: 300px;
}
.footer__nav h4,
.footer__contact h4 {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: rgba(255,255,255,.9);
  margin-bottom: 1rem;
}
.footer__nav ul { display: flex; flex-direction: column; gap: 8px; }
.footer__nav a {
  font-size: 0.875rem;
  transition: color var(--transition);
}
.footer__nav a:hover { color: #fff; }
.footer__contact p {
  font-size: 0.875rem;
  line-height: 1.8;
}
.footer__contact a { transition: color var(--transition); }
.footer__contact a:hover { color: #fff; }

.footer__bottom {
  border-top: 1px solid rgba(255,255,255,.08);
}
.footer__bottom-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding-top: 1.25rem;
  padding-bottom: 1.25rem;
  font-size: 0.825rem;
  color: rgba(255,255,255,.4);
}

/* ============================================================
   BACK TO TOP
   ============================================================ */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 44px; height: 44px;
  background: var(--color-primary);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  z-index: 900;
  transition: background var(--transition), transform var(--transition), opacity var(--transition);
  opacity: 0;
}
.back-to-top:not([hidden]) { opacity: 1; }
.back-to-top:hover { background: var(--color-primary-dark); transform: translateY(-2px); }
.back-to-top[hidden] { display: flex !important; opacity: 0; pointer-events: none; }

/* ============================================================
   SCROLL ANIMATIONS
   ============================================================ */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================================
   RESPONSIVE ADJUSTMENTS
   ============================================================ */
@media (max-width: 640px) {
  .hero__stats { gap: 1.5rem; }
  .hero__stat-num { font-size: 2rem; }
  .products__grid { grid-template-columns: 1fr; }
  .services__grid { grid-template-columns: 1fr; }
  .projects__counters { gap: 1rem; }
  .projects__counter { padding: 1.5rem; min-width: 130px; }
  .contact__form { padding: 1.5rem; }
  .footer__bottom-inner { flex-direction: column; text-align: center; }
  .back-to-top { bottom: 1rem; right: 1rem; }
}

/* ============================================================
   PRINT STYLES
   ============================================================ */
@media print {
  .header, .burger, .back-to-top, .hero__scroll,
  .contact__form, .btn { display: none !important; }
  .hero { min-height: auto; padding: 2rem 0; }
  .section { padding: 2rem 0; }
}

/* ============================================================
   PRODUCT CARD PARTNER BADGE
   ============================================================ */
.product-card__partner {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  padding: 8px 12px;
  background: rgba(26, 95, 168, 0.07);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  margin-top: auto;
}
.product-card--featured .product-card__partner {
  background: rgba(255,255,255,0.12);
  border-color: rgba(255,255,255,0.2);
  color: rgba(255,255,255,0.85);
}

/* ============================================================
   GOOGLE MAPS EMBED
   ============================================================ */
.contact__map {
  margin-top: 1.5rem;
}
.contact__map .contact__item-label {
  margin-bottom: 0.75rem;
}
.map-container {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}
.map-container iframe {
  display: block;
}

/* ============================================================
   FORM GLOBAL ERROR STATE
   ============================================================ */
.form__error-global {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-top: 1rem;
  padding: 1rem 1.25rem;
  background: #fef2f2;
  border: 1px solid #fecaca;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: #991b1b;
}
.form__error-global svg { flex-shrink: 0; color: var(--color-error); margin-top: 1px; }

/* ============================================================
   PARTNERS GRID
   ============================================================ */
.partners__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
  margin-bottom: 2.5rem;
}
.partner-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 1.5rem;
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.12);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: inherit;
  transition: background var(--transition), border-color var(--transition), transform var(--transition);
}
.partner-card:hover {
  background: rgba(255,255,255,.1);
  border-color: var(--color-accent);
  transform: translateY(-2px);
}
.partner-card__flag { font-size: 1.5rem; margin-bottom: 4px; }
.partner-card__name {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 700;
  color: #fff;
}
.partner-card__country {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: .05em;
  color: var(--color-accent);
  text-transform: uppercase;
}
.partner-card__desc {
  font-size: 0.85rem;
  color: rgba(255,255,255,.6);
  line-height: 1.6;
  margin-top: 4px;
}

/* ============================================================
   SUPPORT SECTION
   ============================================================ */
.support { background: var(--color-bg); }

/* ============================================================
   APPLICATIONS SECTION
   ============================================================ */
.applications { background: var(--color-bg-gray); }

.applications__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
}

.application-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
}
.application-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
  border-color: var(--color-primary-light);
}
.application-card__icon {
  font-size: 2rem;
  margin-bottom: 0.75rem;
  display: block;
}
.application-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--color-text);
}
.application-card p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* ============================================================
   HOW IT WORKS
   ============================================================ */
.how-it-works { background: var(--color-bg-gray); }

.how__steps {
  display: flex;
  align-items: flex-start;
  gap: 0;
}
.how__step {
  flex: 1;
  text-align: center;
  padding: 2rem 1.25rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}
.how__step-num {
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: .1em;
  color: var(--color-primary);
  margin-bottom: 8px;
}
.how__step-icon { font-size: 2rem; margin-bottom: 0.75rem; display: block; }
.how__step h3 { font-size: 1rem; font-weight: 700; margin-bottom: 0.5rem; }
.how__step p { font-size: 0.85rem; color: var(--color-text-muted); line-height: 1.65; }
.how__step-arrow {
  align-self: center;
  font-size: 1.5rem;
  color: var(--color-primary);
  padding: 0 0.5rem;
  flex-shrink: 0;
  opacity: 0.4;
}
@media (max-width: 768px) {
  .how__steps { flex-direction: column; gap: 8px; }
  .how__step-arrow { transform: rotate(90deg); align-self: center; }
}

/* ============================================================
   SUPPORT CARDS
   ============================================================ */
.support__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}
.support__card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.75rem;
}
.support__card--highlight {
  border-color: var(--color-primary-light);
  background: linear-gradient(135deg, #e8f0fc 0%, #f4f7fb 100%);
}
.support__card-icon { font-size: 1.75rem; margin-bottom: 0.75rem; display: block; }
.support__card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 0.5rem; }
.support__card > p { font-size: 0.875rem; color: var(--color-text-muted); line-height: 1.65; }
.support__links {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 1rem;
}
.support__link {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition);
}
.support__link:hover { color: var(--color-primary-dark); text-decoration: underline; }
.support__cities {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}
.support__cities span {
  background: var(--color-bg-gray);
  border: 1px solid var(--color-border);
  border-radius: 100px;
  padding: 3px 12px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-text);
}

/* ============================================================
   CASE STUDIES
   ============================================================ */
.case-studies { background: var(--color-bg-gray); }

.cases__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.case-card {
  display: flex;
  flex-direction: column;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.case-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-light);
}

.case-card__thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: #000;
}
.case-card__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: opacity var(--transition);
}
.case-card:hover .case-card__thumb img { opacity: 0.85; }

.case-card__play {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  color: #fff;
  text-shadow: 0 2px 8px rgba(0,0,0,.6);
  pointer-events: none;
  opacity: 0.85;
  transition: opacity var(--transition), transform var(--transition);
}
.case-card:hover .case-card__play {
  opacity: 1;
  transform: scale(1.1);
}

.case-card__body { padding: 1.25rem; flex: 1; display: flex; flex-direction: column; gap: 6px; }
.case-card__tag {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--color-primary);
}
.case-card__body h3 { font-size: 1rem; font-weight: 700; }
.case-card__body p { font-size: 0.85rem; color: var(--color-text-muted); line-height: 1.65; }

.cases__more {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  flex-wrap: wrap;
  border-top: 1px solid var(--color-border);
  padding-top: 1.25rem;
}
.cases__more-link {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition);
}
.cases__more-link:hover { color: var(--color-primary-dark); text-decoration: underline; }

/* ============================================================
   CREDENTIALS BLOCK (About section)
   ============================================================ */
.credentials {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}
.credential {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 14px 16px;
  background: linear-gradient(135deg, #e8f0fc 0%, #f4f7fb 100%);
  border: 1px solid #bdd2ef;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}
.credential__icon { font-size: 1.2rem; flex-shrink: 0; margin-top: 1px; }
.credential strong { color: var(--color-text); font-weight: 700; }
.credential span { font-size: 0.82rem; }