/* ============================================================
   Alterfaber — Styles
   Color palette from the presentation:
   - Dark bg:      #0d0d12
   - Dark alt:     #151738
   - Accent:       #4950BC
   - Lavender:     #DADBF1
   - Light purple: #C0C1D7
   - Near-black:   #101014, #272525
   ============================================================ */

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: #0d0d12;
  color: #e8e8f0;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

ul {
  list-style: none;
}

a {
  color: inherit;
  text-decoration: none;
}

/* ── Custom Properties ───────────────────────────────────── */
:root {
  --accent:       #4950BC;
  --accent-light: #6870d4;
  --dark-bg:      #0d0d12;
  --dark-alt:     #151738;
  --dark-card:    #1a1b2e;
  --lavender:     #DADBF1;
  --purple-mid:   #C0C1D7;
  --text-main:    #e8e8f0;
  --text-muted:   #9899b8;
  --border:       rgba(73, 80, 188, 0.25);
  --radius-sm:    6px;
  --radius-md:    6px;
  --radius-lg:    20px;
  --transition:   0.2s ease;
  --shadow:       0 4px 24px rgba(0,0,0,0.4);
}

/* ── Container ───────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ── Sections ────────────────────────────────────────────── */
.section {
  padding: 96px 0;
}

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

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

/* Default (light) section */
.services-overview,
.operations-section,
.why-section,
.contact-section {
  background: var(--dark-bg);
}

.equipment-section {
  background: var(--dark-alt);
}

/* ── Section Header ──────────────────────────────────────── */
.section-header {
  margin-bottom: 56px;
  max-width: 720px;
}

.section-header.center {
  text-align: center;
  margin-left: auto;
  margin-right: auto;
}

.section-header p {
  color: var(--text-muted);
  font-size: 1.0625rem;
  margin-top: 16px;
  line-height: 1.7;
}

.note-text {
  color: var(--purple-mid);
  font-size: 0.9375rem;
  margin-top: 12px;
  font-style: italic;
}

.subsection-title {
  font-size: 1.125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-light);
  margin-bottom: 32px;
}

/* ── Label ───────────────────────────────────────────────── */
.label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-light);
  background: rgba(73, 80, 188, 0.12);
  border: 1px solid rgba(73, 80, 188, 0.3);
  padding: 4px 12px;
  border-radius: 100px;
  margin-bottom: 16px;
}

/* ── Headings ─────────────────────────────────────────────── */
h1, h2, h3, h4 {
  font-family: 'Barlow', 'Segoe UI', system-ui, sans-serif;
  line-height: 1.2;
  font-weight: 800;
  color: #fff;
}

h1 { font-size: clamp(2rem, 4vw, 3.25rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.5rem); }
h3 { font-size: 1.25rem; font-weight: 700; }
h4 { font-size: 1rem; font-weight: 700; }

/* ── Buttons ─────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9375rem;
  font-weight: 600;
  padding: 13px 28px;
  border-radius: var(--radius-md);
  transition: all var(--transition);
  cursor: pointer;
  border: 2px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.btn-primary:hover {
  background: var(--accent-light);
  border-color: var(--accent-light);
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(73, 80, 188, 0.35);
}

.btn-outline {
  background: transparent;
  color: #fff;
  border-color: rgba(255,255,255,0.3);
}

.btn-outline:hover {
  border-color: #fff;
  transform: translateY(-1px);
}

/* ── Link Arrow ──────────────────────────────────────────── */
.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent-light);
  transition: gap var(--transition), color var(--transition);
}

.link-arrow:hover {
  color: #fff;
  gap: 10px;
}

/* ═══════════════════════════════════════════════════════════
   NAVIGATION
═══════════════════════════════════════════════════════════ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(13, 13, 18, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}

.nav.scrolled {
  background: rgba(13, 13, 18, 0.98);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 32px;
}

.nav-logo {
  font-family: 'Barlow', 'Segoe UI', system-ui, sans-serif;
  font-size: 1.0625rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  color: #fff;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}

.nav-links a:hover {
  color: #fff;
  background: rgba(255,255,255,0.06);
}

.nav-links .nav-cta {
  background: var(--accent);
  color: #fff;
  padding: 8px 18px;
  border-radius: var(--radius-md);
  font-weight: 600;
}

.nav-links .nav-cta:hover {
  background: var(--accent-light);
}

/* ── Language Switcher ───────────────────────────────────── */
.lang-switcher {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  border: 1px solid rgba(255,255,255,0.18);
  border-radius: 4px;
  overflow: hidden;
}

.lang-sep {
  display: none;
}

.lang-btn {
  background: transparent;
  border: none;
  border-left: 1px solid rgba(255,255,255,0.18);
  cursor: pointer;
  font-family: inherit;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  padding: 5px 10px;
  line-height: 1;
  transition: color var(--transition), background var(--transition);
}

.lang-btn:first-child {
  border-left: none;
}

.lang-btn:hover {
  color: #fff;
  background: rgba(255,255,255,0.08);
}

.lang-btn.active {
  background: rgba(255,255,255,0.12);
  color: #fff;
}

/* ── Nav Toggle ──────────────────────────────────────────── */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

/* ═══════════════════════════════════════════════════════════
   HERO
═══════════════════════════════════════════════════════════ */
.hero {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1fr 1fr;
  overflow: hidden;
  padding-top: 68px;
}

.hero-content {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 80px 24px 80px calc((100vw - 1200px) / 2 + 24px);
  max-width: calc(600px + (100vw - 1200px) / 2 + 24px);
  background: var(--dark-bg);
}

.hero-eyebrow {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-light);
  margin-bottom: 16px;
}

.hero-content h1 {
  margin-bottom: 20px;
  color: #fff;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--lavender);
  font-weight: 500;
  margin-bottom: 20px;
  line-height: 1.5;
}

.hero-body {
  color: var(--text-muted);
  font-size: 1rem;
  margin-bottom: 40px;
  max-width: 520px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-image {
  position: relative;
  overflow: hidden;
}

.hero-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

/* ═══════════════════════════════════════════════════════════
   CARDS GRID
═══════════════════════════════════════════════════════════ */
.cards-grid {
  display: grid;
  gap: 24px;
}

.three-col { grid-template-columns: repeat(3, 1fr); }
.four-col  { grid-template-columns: repeat(4, 1fr); }

/* ── Card base ───────────────────────────────────────────── */
.card {
  background: var(--dark-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: rgba(73, 80, 188, 0.5);
}

/* ── Media Card (services overview) ─────────────────────── */
.card-media .card-img {
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  overflow: hidden;
  aspect-ratio: 16/9;
}

.card-media .card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.card-media:hover .card-img img {
  transform: scale(1.04);
}

.card-media .card-body {
  padding: 28px;
}

.card-media h3 {
  margin-bottom: 10px;
  font-size: 1.125rem;
}

.card-media p {
  color: var(--text-muted);
  font-size: 0.9375rem;
  margin-bottom: 16px;
  line-height: 1.6;
}

/* ── Feature Card (equipment) ────────────────────────────── */
.card-feature {
  padding: 32px 28px;
}

.card-icon {
  width: 48px;
  height: 48px;
  color: var(--accent-light);
  margin-bottom: 20px;
}

.card-icon svg {
  width: 100%;
  height: 100%;
}

.card-feature h4 {
  font-size: 1rem;
  margin-bottom: 10px;
  color: #fff;
}

.card-feature p {
  color: var(--text-muted);
  font-size: 0.9375rem;
  line-height: 1.6;
}

/* ── Event Card ──────────────────────────────────────────── */
.card-event {
  padding: 32px 28px;
}

.event-icon {
  width: 64px;
  height: 64px;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(73, 80, 188, 0.1);
  border-radius: 14px;
}

.event-icon img,
.event-icon svg {
  width: 40px;
  height: 40px;
  object-fit: contain;
}

.card-event h3 {
  font-size: 1.0625rem;
  margin-bottom: 10px;
}

.card-event p {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* ── Why Card ────────────────────────────────────────────── */
.card-why {
  padding: 36px 32px;
  text-align: center;
}

.why-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(73, 80, 188, 0.1);
  border-radius: 50%;
}

.why-icon img {
  width: 48px;
  height: 48px;
  object-fit: contain;
}

.card-why h3 {
  margin-bottom: 12px;
  font-size: 1.125rem;
}

.card-why p {
  color: var(--text-muted);
  font-size: 0.9375rem;
  line-height: 1.65;
}

/* ═══════════════════════════════════════════════════════════
   OPERATIONS (Install & Technical)
═══════════════════════════════════════════════════════════ */
.operations-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.operations-block.reverse {
  direction: rtl;
}

.operations-block.reverse > * {
  direction: ltr;
}

.operations-text .label {
  margin-bottom: 12px;
}

.operations-text h2 {
  margin-bottom: 20px;
}

.operations-text > p {
  color: var(--text-muted);
  font-size: 1rem;
  margin-bottom: 12px;
  line-height: 1.7;
}

.operations-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 4/3;
  box-shadow: var(--shadow);
}

.operations-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Ops items list */
.ops-items {
  margin-top: 32px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.ops-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.ops-icon {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ops-icon img {
  width: 32px;
  height: 32px;
  object-fit: contain;
}

.ops-item h4 {
  margin-bottom: 4px;
  font-size: 0.9375rem;
  color: #fff;
}

.ops-item p {
  color: var(--text-muted);
  font-size: 0.875rem;
  line-height: 1.6;
}

/* Two-col lists */
.two-col-lists {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin-top: 28px;
  margin-bottom: 24px;
}

.two-col-lists h4 {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-light);
  margin-bottom: 12px;
}

.two-col-lists ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.two-col-lists li {
  color: var(--text-muted);
  font-size: 0.875rem;
  line-height: 1.55;
  padding-left: 16px;
  position: relative;
}

.two-col-lists li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
}

.highlight-text {
  color: var(--lavender);
  font-size: 0.9375rem;
  font-style: italic;
  border-left: 2px solid var(--accent);
  padding-left: 16px;
  line-height: 1.6;
}

/* ═══════════════════════════════════════════════════════════
   EVENTS SECTION
═══════════════════════════════════════════════════════════ */
.events-cta-text {
  text-align: center;
  margin-top: 48px;
  color: var(--text-muted);
  font-size: 1rem;
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.7;
}

/* ═══════════════════════════════════════════════════════════
   CONTACT
═══════════════════════════════════════════════════════════ */
.contact-top {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  margin-bottom: 72px;
  align-items: start;
}

.process-steps {
  display: flex;
  flex-direction: column;
  gap: 32px;
  padding-top: 8px;
}

.process-step {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.step-num {
  font-size: 2.5rem;
  font-weight: 800;
  color: rgba(73, 80, 188, 0.25);
  line-height: 1;
  flex-shrink: 0;
  min-width: 64px;
  font-variant-numeric: tabular-nums;
}

.process-step h4 {
  font-size: 1rem;
  margin-bottom: 6px;
}

.process-step p {
  color: var(--text-muted);
  font-size: 0.875rem;
  line-height: 1.6;
}

/* Contact Form */
.contact-form-wrap {
  background: var(--dark-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 48px;
}

.contact-form-wrap h3 {
  font-size: 1.75rem;
  margin-bottom: 10px;
}

.contact-form-wrap > p {
  color: var(--text-muted);
  margin-bottom: 36px;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 28px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group-full {
  grid-column: 1 / -1;
}

label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--purple-mid);
  letter-spacing: 0.04em;
}

input, textarea {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-sm);
  color: #fff;
  font-family: inherit;
  font-size: 0.9375rem;
  padding: 12px 16px;
  transition: border-color var(--transition), background var(--transition);
  resize: vertical;
  -webkit-appearance: none;
}

input::placeholder, textarea::placeholder {
  color: rgba(255,255,255,0.3);
}

input:focus, textarea:focus {
  outline: none;
  border-color: var(--accent);
  background: rgba(73, 80, 188, 0.08);
}

.btn-submit {
  font-size: 1rem;
  padding: 15px 40px;
}

.form-success {
  display: flex;
  align-items: center;
  gap: 12px;
  background: rgba(73, 80, 188, 0.12);
  border: 1px solid var(--accent);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin-top: 16px;
}

.form-success svg {
  width: 24px;
  height: 24px;
  color: var(--accent-light);
  flex-shrink: 0;
}

.form-success p {
  color: var(--lavender);
  font-size: 0.9375rem;
}

/* ═══════════════════════════════════════════════════════════
   FOOTER
═══════════════════════════════════════════════════════════ */
.footer {
  background: #06060a;
  border-top: 1px solid var(--border);
  padding: 48px 0 24px;
}

.footer-inner {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-wordmark {
  display: block;
  font-family: 'Barlow', 'Segoe UI', system-ui, sans-serif;
  font-size: 0.9375rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  color: #fff;
  margin-bottom: 12px;
}

.footer-logo p {
  color: var(--text-muted);
  font-size: 0.875rem;
  max-width: 280px;
  line-height: 1.6;
}

.footer-nav ul {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

.footer-nav a {
  color: var(--text-muted);
  font-size: 0.875rem;
  transition: color var(--transition);
}

.footer-nav a:hover {
  color: #fff;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding-top: 20px;
}

.footer-bottom p {
  color: var(--text-muted);
  font-size: 0.8125rem;
}

/* ═══════════════════════════════════════════════════════════
   SCROLL ANIMATIONS
═══════════════════════════════════════════════════════════ */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: none;
}

/* Stagger cards in a grid */
.cards-grid .fade-in:nth-child(2) { transition-delay: 0.08s; }
.cards-grid .fade-in:nth-child(3) { transition-delay: 0.16s; }
.cards-grid .fade-in:nth-child(4) { transition-delay: 0.08s; }
.cards-grid .fade-in:nth-child(5) { transition-delay: 0.16s; }
.cards-grid .fade-in:nth-child(6) { transition-delay: 0.24s; }

/* ═══════════════════════════════════════════════════════════
   RESPONSIVE
═══════════════════════════════════════════════════════════ */

/* Tablet: 1024px */
@media (max-width: 1024px) {
  .section {
    padding: 72px 0;
  }

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

  .operations-block {
    gap: 48px;
  }

  .contact-top {
    gap: 48px;
  }

  .contact-form-wrap {
    padding: 36px;
  }
}

/* Tablet: 768px */
@media (max-width: 768px) {
  .section {
    padding: 56px 0;
  }

  /* Nav */
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: 68px;
    left: 0;
    right: 0;
    background: rgba(13, 13, 18, 0.98);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: stretch;
    padding: 16px;
    gap: 4px;
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.28s ease, opacity 0.28s ease;
    backdrop-filter: blur(16px);
    z-index: 99;
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-links a {
    padding: 12px 16px;
    font-size: 1rem;
  }

  .nav-links .nav-cta {
    text-align: center;
    margin-top: 4px;
  }

  /* Nav toggle animation */
  .nav-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }
  .nav-toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
  }
  .nav-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  /* Hero */
  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .hero-content {
    padding: 64px 24px 48px;
    max-width: 100%;
    order: 2;
  }

  .hero-image {
    order: 1;
    aspect-ratio: 16/9;
    max-height: 40vh;
  }

  .hero-eyebrow {
    display: none;
  }

  /* Grids */
  .three-col {
    grid-template-columns: 1fr;
  }

  .four-col {
    grid-template-columns: 1fr;
  }

  /* Operations */
  .operations-block,
  .operations-block.reverse {
    grid-template-columns: 1fr;
    direction: ltr;
    gap: 36px;
  }

  .operations-image {
    order: -1;
  }

  .two-col-lists {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  /* Contact */
  .contact-top {
    grid-template-columns: 1fr;
    gap: 40px;
  }

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

  .contact-form-wrap {
    padding: 28px 20px;
  }

  /* Footer */
  .footer-inner {
    flex-direction: column;
    gap: 28px;
  }

  .footer-nav ul {
    flex-direction: column;
    gap: 12px;
  }
}

/* Mobile: 480px */
@media (max-width: 480px) {
  .section {
    padding: 48px 0;
  }

  .hero-content {
    padding: 48px 20px 36px;
  }

  .hero-actions {
    flex-direction: column;
  }

  .hero-actions .btn {
    text-align: center;
    justify-content: center;
  }

  .section-header {
    margin-bottom: 40px;
  }

  .process-steps {
    gap: 24px;
  }

  .step-num {
    font-size: 1.75rem;
    min-width: 48px;
  }

  .contact-form-wrap {
    padding: 24px 16px;
  }
}