/* ============================================
   Progressive Flow Bulgaria — Main Stylesheet
   ============================================ */

/* --- Design Tokens --- */
:root {
  --color-primary: #0054a6;
  --color-primary-dark: #003d7a;
  --color-primary-light: #e8f0fe;
  --color-secondary: #2c3e50;
  --color-accent: #0693e3;
  --color-text: #333333;
  --color-text-light: #666666;
  --color-bg: #ffffff;
  --color-bg-alt: #f8f9fa;
  --color-bg-dark: #1a1a2e;
  --color-border: #e0e0e0;
  --color-success: #28a745;
  --color-error: #dc3545;

  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-base: 1rem;
  --font-size-sm: 0.875rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;
  --font-size-3xl: 2.5rem;
  --font-size-hero: 3rem;
  --line-height-base: 1.7;
  --line-height-heading: 1.2;

  --max-width: 1200px;
  --max-width-narrow: 800px;
  --header-height: 80px;
  --border-radius: 8px;
  --border-radius-lg: 16px;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
  --transition: 300ms ease;
  --transition-fast: 150ms ease;
}

/* --- Reset --- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-dark);
}

ul, ol {
  list-style: none;
}

button {
  cursor: pointer;
  font-family: inherit;
  border: none;
  background: none;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-secondary);
  line-height: var(--line-height-heading);
  font-weight: 700;
}

h1 { font-size: var(--font-size-hero); margin-bottom: 1rem; }
h2 { font-size: var(--font-size-3xl); margin-bottom: 0.75rem; }
h3 { font-size: var(--font-size-xl); margin-bottom: 0.5rem; }
h4 { font-size: var(--font-size-lg); margin-bottom: 0.5rem; }

p {
  margin-bottom: 1rem;
  color: var(--color-text-light);
}

/* --- Layout --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.container--narrow {
  max-width: var(--max-width-narrow);
}

.section {
  padding: 5rem 0;
}

.section--alt {
  background-color: var(--color-bg-alt);
}

.section--dark {
  background-color: var(--color-bg-dark);
  color: #ffffff;
}

.section--dark h2,
.section--dark h3 {
  color: #ffffff;
}

.section--dark p {
  color: rgba(255, 255, 255, 0.8);
}

/* --- Buttons --- */
.btn {
  display: inline-block;
  padding: 0.875rem 2rem;
  font-size: var(--font-size-base);
  font-weight: 600;
  border-radius: var(--border-radius);
  transition: all var(--transition);
  text-align: center;
  letter-spacing: 0.02em;
}

.btn--primary {
  background-color: var(--color-primary);
  color: #ffffff;
}

.btn--primary:hover {
  background-color: var(--color-primary-dark);
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn--outline {
  background-color: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn--outline:hover {
  background-color: var(--color-primary);
  color: #ffffff;
  transform: translateY(-2px);
}

.btn--white {
  background-color: #ffffff;
  color: var(--color-primary);
}

.btn--white:hover {
  background-color: var(--color-primary-light);
  color: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn--lg {
  padding: 1rem 2.5rem;
  font-size: var(--font-size-lg);
}

/* --- Header --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  transition: all var(--transition);
  background-color: transparent;
}

.header--scrolled {
  background-color: rgba(255, 255, 255, 0.97);
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(10px);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

.header__logo img {
  height: 45px;
  width: auto;
}

.header__nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.header__nav a {
  color: rgba(255, 255, 255, 0.9);
  font-weight: 500;
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  position: relative;
  padding: 0.25rem 0;
}

.header__nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: rgba(255, 255, 255, 0.8);
  transition: width var(--transition);
}

.header__nav a:hover::after,
.header__nav a.active::after {
  width: 100%;
}

.header__nav a.active {
  color: #ffffff;
}

.header--scrolled .header__nav a {
  color: var(--color-secondary);
}

.header--scrolled .header__nav a.active {
  color: var(--color-primary);
}

.header--scrolled .header__nav a::after {
  background-color: var(--color-primary);
}

/* On dark hero pages, header text should be white until scrolled */
.header--transparent .header__nav a {
  color: rgba(255, 255, 255, 0.9);
}

.header--transparent .header__nav a.active {
  color: #ffffff;
}

.header--transparent.header--scrolled .header__nav a {
  color: var(--color-secondary);
}

.header--transparent.header--scrolled .header__nav a.active {
  color: var(--color-primary);
}

/* Hamburger */
.header__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 0.5rem;
  z-index: 1001;
}

.header__hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: rgba(255, 255, 255, 0.9);
  transition: all var(--transition);
}

.header--scrolled .header__hamburger span {
  background-color: var(--color-secondary);
}

/* --- Hero Section --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: #ffffff;
  overflow: hidden;
  background: linear-gradient(160deg, #002a5c 0%, #0054a6 40%, #003d7a 70%, #1a1a2e 100%);
}

.hero::before {
  content: '';
  position: absolute;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: rgba(6, 147, 227, 0.08);
  top: -150px;
  right: -100px;
}

.hero::after {
  content: '';
  position: absolute;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.04);
  bottom: -100px;
  left: -80px;
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 820px;
  padding: 0 1.5rem;
}

.hero__tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 0.4rem 1.2rem;
  border-radius: 100px;
  margin-bottom: 2rem;
}

.hero__title {
  font-size: var(--font-size-hero);
  color: #ffffff;
  margin-bottom: 1.5rem;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.hero__subtitle {
  font-size: var(--font-size-lg);
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 2.5rem;
  line-height: 1.8;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* --- Page Banner (inner pages) --- */
.page-banner {
  padding: 10rem 0 4rem;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-bg-dark) 100%);
  text-align: center;
  color: #ffffff;
}

.page-banner h1 {
  color: #ffffff;
  font-size: var(--font-size-3xl);
  margin-bottom: 0.5rem;
}

.page-banner p {
  color: rgba(255, 255, 255, 0.8);
  font-size: var(--font-size-lg);
  max-width: 600px;
  margin: 0 auto;
}

/* --- Cards Grid --- */
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.card {
  background-color: var(--color-bg);
  border-radius: var(--border-radius-lg);
  padding: 2.5rem 2rem;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
  border: 1px solid var(--color-border);
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-light);
}

.card__icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-primary-light);
  border-radius: 50%;
  color: var(--color-primary);
}

.card__icon svg {
  width: 28px;
  height: 28px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.card h3 {
  margin-bottom: 0.75rem;
}

/* --- Service Blocks (alternating layout) --- */
.service-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  padding: 4rem 0;
}

.service-block:not(:last-child) {
  border-bottom: 1px solid var(--color-border);
}

.service-block--reverse .service-block__image {
  order: 2;
}

.service-block__image {
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.service-block__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  aspect-ratio: 4/3;
}

.service-block__content h3 {
  font-size: var(--font-size-2xl);
  margin-bottom: 1rem;
}

.service-block__content ul {
  list-style: none;
  margin-top: 1.5rem;
}

.service-block__content ul li {
  padding: 0.4rem 0;
  padding-left: 1.5rem;
  position: relative;
  color: var(--color-text-light);
}

.service-block__content ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.85rem;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-primary);
}

/* --- About / Info Section --- */
.info-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.info-section__image {
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.info-section__image img {
  width: 100%;
  object-fit: cover;
}

/* --- Global Presence --- */
.locations {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  text-align: center;
}

.location {
  padding: 2rem 1rem;
}

.location__icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.location h4 {
  margin-bottom: 0.25rem;
}

/* --- Contact Layout --- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
}

/* --- Contact Form --- */
.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--color-secondary);
  font-size: var(--font-size-sm);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.875rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  transition: border-color var(--transition-fast);
  background-color: var(--color-bg);
  color: var(--color-text);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0, 84, 166, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 150px;
}

.form-group input.error,
.form-group textarea.error {
  border-color: var(--color-error);
}

.form-error {
  color: var(--color-error);
  font-size: var(--font-size-sm);
  margin-top: 0.25rem;
  display: none;
}

.form-success {
  background-color: #d4edda;
  color: #155724;
  padding: 1.5rem;
  border-radius: var(--border-radius);
  text-align: center;
  font-weight: 500;
  display: none;
}

.form-success.show {
  display: block;
}

/* --- Office Info --- */
.office {
  margin-bottom: 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--color-border);
}

.office:last-child {
  border-bottom: none;
}

.office h4 {
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.office p {
  margin-bottom: 0.25rem;
  font-size: var(--font-size-sm);
}

.office a {
  font-weight: 500;
}

/* --- CTA Section --- */
.cta {
  text-align: center;
  padding: 5rem 0;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  color: #ffffff;
}

.cta h2 {
  color: #ffffff;
  margin-bottom: 1rem;
}

.cta p {
  color: rgba(255, 255, 255, 0.9);
  font-size: var(--font-size-lg);
  max-width: 600px;
  margin: 0 auto 2rem;
}

/* --- Footer --- */
.footer {
  background-color: var(--color-bg-dark);
  color: rgba(255, 255, 255, 0.7);
  padding: 4rem 0 0;
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer__about img {
  height: 40px;
  margin-bottom: 1rem;
  filter: brightness(10);
}

.footer__about p {
  color: rgba(255, 255, 255, 0.6);
  font-size: var(--font-size-sm);
}

.footer h4 {
  color: #ffffff;
  margin-bottom: 1.25rem;
  font-size: var(--font-size-base);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer__links a {
  display: block;
  color: rgba(255, 255, 255, 0.6);
  padding: 0.3rem 0;
  font-size: var(--font-size-sm);
  transition: color var(--transition-fast);
}

.footer__links a:hover {
  color: #ffffff;
}

.footer__contact-info p {
  font-size: var(--font-size-sm);
  margin-bottom: 0.5rem;
  color: rgba(255, 255, 255, 0.6);
}

.footer__contact-info a {
  color: rgba(255, 255, 255, 0.8);
}

.footer__contact-info a:hover {
  color: #ffffff;
}

.footer__bottom {
  text-align: center;
  padding: 1.5rem 0;
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.4);
}

/* --- Cookie Consent Banner --- */
.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  background-color: rgba(26, 26, 46, 0.97);
  color: #ffffff;
  padding: 1.25rem 0;
  z-index: 9999;
  transform: translateY(100%);
  transition: transform var(--transition);
  backdrop-filter: blur(10px);
}

.cookie-banner.show {
  transform: translateY(0);
}

.cookie-banner__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
}

.cookie-banner__text {
  flex: 1;
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.8);
  min-width: 200px;
}

.cookie-banner__buttons {
  display: flex;
  gap: 0.75rem;
  flex-shrink: 0;
}

.cookie-banner__buttons .btn {
  padding: 0.625rem 1.5rem;
  font-size: var(--font-size-sm);
}

.cookie-btn-reject {
  background: transparent;
  color: rgba(255, 255, 255, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--border-radius);
  padding: 0.625rem 1.5rem;
  font-size: var(--font-size-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.cookie-btn-reject:hover {
  border-color: rgba(255, 255, 255, 0.6);
  color: #ffffff;
}

/* --- Animations --- */
[data-animate] {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-animate].is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Language Switcher --- */
.lang-switcher {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  margin-left: 1.5rem;
  font-size: var(--font-size-sm);
  font-weight: 600;
  flex-shrink: 0;
}

.lang-switcher a {
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: rgba(255, 255, 255, 0.7);
  transition: all var(--transition-fast);
}

.lang-switcher a:hover {
  color: #ffffff;
}

.lang-switcher a.active {
  color: #ffffff;
  background-color: rgba(255, 255, 255, 0.15);
}

.lang-switcher span {
  color: rgba(255, 255, 255, 0.4);
  font-weight: 300;
}

.header--scrolled .lang-switcher a {
  color: var(--color-text-light);
}

.header--scrolled .lang-switcher a:hover {
  color: var(--color-primary);
}

.header--scrolled .lang-switcher a.active {
  color: var(--color-primary);
  background-color: var(--color-primary-light);
}

.header--scrolled .lang-switcher span {
  color: var(--color-border);
}

/* --- Utility --- */
.text-center { text-align: center; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }
.mb-5 { margin-bottom: 3rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 3rem;
}

/* --- Responsive --- */

/* Tablet */
@media (max-width: 1024px) {
  :root {
    --font-size-hero: 2.5rem;
    --font-size-3xl: 2rem;
    --font-size-2xl: 1.5rem;
  }

  .cards {
    grid-template-columns: repeat(2, 1fr);
  }

  .service-block {
    gap: 2.5rem;
  }

  .footer__grid {
    grid-template-columns: 1fr 1fr;
  }

  .locations {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Mobile */
@media (max-width: 768px) {
  :root {
    --font-size-hero: 2rem;
    --font-size-3xl: 1.75rem;
    --font-size-2xl: 1.375rem;
    --header-height: 65px;
  }

  .section {
    padding: 3.5rem 0;
  }

  /* Mobile Navigation */
  .header__nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background-color: var(--color-bg);
    flex-direction: column;
    justify-content: center;
    gap: 1.5rem;
    padding: 2rem;
    box-shadow: var(--shadow-lg);
    transition: right var(--transition);
    z-index: 1000;
  }

  .header__nav a {
    color: var(--color-secondary) !important;
    font-size: var(--font-size-base);
  }

  .nav-open .header__nav {
    right: 0;
  }

  .header__hamburger {
    display: flex;
  }

  .nav-open .header__hamburger span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

  .nav-open .header__hamburger span:nth-child(2) {
    opacity: 0;
  }

  .nav-open .header__hamburger span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }

  /* Overlay */
  .nav-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 999;
  }

  .nav-open .nav-overlay {
    display: block;
  }

  .cards {
    grid-template-columns: 1fr;
  }

  .service-block {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: 2.5rem 0;
  }

  .service-block--reverse .service-block__image {
    order: 0;
  }

  .info-section {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .locations {
    grid-template-columns: 1fr 1fr;
  }

  .footer__grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .page-banner {
    padding: 8rem 0 3rem;
  }

  .cookie-banner__inner {
    flex-direction: column;
    text-align: center;
  }

  .hero {
    min-height: 90vh;
  }
}

@media (max-width: 480px) {
  :root {
    --font-size-hero: 1.75rem;
  }

  .locations {
    grid-template-columns: 1fr;
  }

  .btn--lg {
    width: 100%;
  }
}