/* ═══════════════════════════════════════════════════════════════
   BGC CONSULTANCY — Premium Dark Design System
   SpaceX × BMW design language — cinematic, angular, spectral
   ═══════════════════════════════════════════════════════════════ */

/* ── Custom Properties ──────────────────────────────────────── */
:root {
  /* Colour Palette */
  --c-bg:          #0F1118;
  --c-bg-elevated: #161923;
  --c-bg-card:     #1A1D2B;
  --c-bg-hover:    #222640;
  --c-border:      #2A2E3F;
  --c-border-light:#353A50;
  --c-text:        #f0f0fa;
  --c-text-dim:    #8B8FA8;
  --c-text-muted:  #5A5F78;
  --c-accent:      #7C3AED;
  --c-accent-light:#9F67FF;
  --c-accent-glow: rgba(124, 58, 237, 0.25);
  --c-success:     #34D399;
  --c-error:       #F87171;

  /* Typography */
  --f-family:      'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --f-weight-light:300;
  --f-weight-reg:  400;
  --f-weight-med:  500;
  --f-weight-bold: 600;

  /* Spacing */
  --s-section:     clamp(80px, 12vw, 160px);
  --s-container:   1200px;
  --s-gap:         24px;

  /* Misc */
  --radius:        0px;  /* Angular — zero radius (BMW language) */
  --transition:    0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--f-family);
  background-color: var(--c-bg);
  color: var(--c-text);
  font-weight: var(--f-weight-reg);
  line-height: 1.6;
  overflow-x: hidden;
}

img, svg { display: block; max-width: 100%; }
a { color: var(--c-accent-light); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--c-text); }
::selection { background: var(--c-accent); color: var(--c-text); }

/* ── Layout Helpers ─────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--s-container);
  margin: 0 auto;
  padding: 0 clamp(20px, 4vw, 48px);
}

.section {
  padding: var(--s-section) 0;
  position: relative;
}

/* ── Section Headers ────────────────────────────────────────── */
.section-header {
  margin-bottom: clamp(40px, 6vw, 72px);
}

.section-number {
  display: block;
  font-size: 0.75rem;
  font-weight: var(--f-weight-med);
  letter-spacing: 0.2em;
  color: var(--c-accent);
  margin-bottom: 12px;
  text-transform: uppercase;
}

.section-heading {
  font-size: clamp(2rem, 4.5vw, 3.5rem);
  font-weight: var(--f-weight-light);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--c-text);
}

.section-subtitle {
  font-size: clamp(1rem, 1.3vw, 1.2rem);
  color: var(--c-text-dim);
  margin-top: 16px;
  max-width: 540px;
  font-weight: var(--f-weight-reg);
  line-height: 1.5;
}

/* ── Accent Text ────────────────────────────────────────────── */
.accent-text {
  color: var(--c-accent-light);
}

/* ── Navigation ──────────────────────────────────────────────── */
.nav-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 20px 0;
  transition: background var(--transition), padding var(--transition), box-shadow var(--transition);
}

.nav-header.scrolled {
  background: rgba(15, 17, 24, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 12px 0;
  box-shadow: 0 1px 0 var(--c-border);
}

.nav-inner {
  max-width: var(--s-container);
  margin: 0 auto;
  padding: 0 clamp(20px, 4vw, 48px);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: baseline;
  gap: 6px;
  font-weight: var(--f-weight-bold);
  font-size: 1.2rem;
  letter-spacing: -0.02em;
  color: var(--c-text);
  text-decoration: none;
}

.logo-bgc { color: var(--c-accent-light); }
.logo-consultancy {
  color: var(--c-text-dim);
  font-weight: var(--f-weight-light);
  font-size: 0.85em;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-menu a {
  color: var(--c-text-dim);
  font-size: 0.875rem;
  font-weight: var(--f-weight-reg);
  letter-spacing: 0.02em;
  transition: color var(--transition);
  position: relative;
}

.nav-menu a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--c-accent);
  transition: width var(--transition);
}

.nav-menu a:hover { color: var(--c-text); }
.nav-menu a:hover::after { width: 100%; }

.nav-cta {
  background: var(--c-accent) !important;
  color: var(--c-text) !important;
  padding: 8px 20px !important;
  font-weight: var(--f-weight-med) !important;
  transition: background var(--transition), transform var(--transition) !important;
}

.nav-cta::after { display: none !important; }
.nav-cta:hover { background: var(--c-accent-light) !important; transform: translateY(-1px); }

/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 1001;
}

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

.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── Buttons ──────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  font-family: var(--f-family);
  font-size: 0.9rem;
  font-weight: var(--f-weight-med);
  letter-spacing: 0.02em;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  border: none;
  outline: none;
}

.btn-primary {
  background: var(--c-accent);
  color: var(--c-text);
  border: 1px solid var(--c-accent);
}

.btn-primary:hover {
  background: var(--c-accent-light);
  border-color: var(--c-accent-light);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px var(--c-accent-glow);
}

.btn-ghost {
  background: transparent;
  color: var(--c-text-dim);
  border: 1px solid var(--c-border);
}

.btn-ghost:hover {
  color: var(--c-text);
  border-color: var(--c-text);
  transform: translateY(-2px);
}

/* ── Hero Section ────────────────────────────────────────────── */
#hero-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

.hero {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  padding: 0 clamp(20px, 4vw, 48px);
}

.hero-content {
  max-width: var(--s-container);
  margin: 0 auto;
  width: 100%;
}

.hero-eyebrow {
  font-size: 0.8rem;
  font-weight: var(--f-weight-med);
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--c-accent-light);
  margin-bottom: 24px;
}

.hero-heading {
  font-size: clamp(2.8rem, 7vw, 6rem);
  font-weight: var(--f-weight-light);
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--c-text);
  margin-bottom: 28px;
}

.hero-tagline {
  font-size: clamp(1rem, 1.4vw, 1.25rem);
  color: var(--c-text-dim);
  max-width: 520px;
  line-height: 1.6;
  margin-bottom: 40px;
}

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

/* Scroll Indicator */
.hero-scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--c-text-muted);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--c-accent), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 1; transform: scaleY(1); }
  50% { opacity: 0.3; transform: scaleY(0.6); }
}

/* ── Services Section ────────────────────────────────────────── */
.section-services {
  background: var(--c-bg);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--s-gap);
}

.service-card {
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  padding: clamp(24px, 3vw, 36px);
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--c-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.service-card:hover {
  border-color: var(--c-border-light);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.service-card:hover::before {
  transform: scaleX(1);
}

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

.service-title {
  font-size: 1.15rem;
  font-weight: var(--f-weight-med);
  margin-bottom: 10px;
  color: var(--c-text);
  letter-spacing: -0.01em;
}

.service-desc {
  font-size: 0.9rem;
  color: var(--c-text-dim);
  line-height: 1.6;
}

/* ── Approach Section ────────────────────────────────────────── */
.section-approach {
  background: var(--c-bg-elevated);
}

.approach-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(40px, 6vw, 80px);
  align-items: center;
}

.approach-statement {
  position: relative;
}

.approach-large-text {
  font-size: clamp(2.2rem, 4vw, 3.8rem);
  font-weight: var(--f-weight-light);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.approach-details {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.approach-item {
  padding-left: 56px;
  position: relative;
}

.approach-item-number {
  position: absolute;
  left: 0;
  top: 2px;
  font-size: 0.75rem;
  font-weight: var(--f-weight-med);
  color: var(--c-accent);
  letter-spacing: 0.1em;
}

.approach-item h3 {
  font-size: 1.1rem;
  font-weight: var(--f-weight-med);
  margin-bottom: 6px;
  color: var(--c-text);
}

.approach-item p {
  font-size: 0.9rem;
  color: var(--c-text-dim);
  line-height: 1.55;
}

/* ── Clients Section ─────────────────────────────────────────── */
.section-clients {
  background: var(--c-bg);
}

.clients-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--s-gap);
}

.client-card {
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  padding: clamp(24px, 3vw, 32px);
  text-align: center;
  transition: border-color var(--transition), transform var(--transition);
}

.client-card:hover {
  border-color: var(--c-border-light);
  transform: translateY(-2px);
}

.client-name {
  display: block;
  font-size: 1.6rem;
  font-weight: var(--f-weight-bold);
  letter-spacing: 0.08em;
  color: var(--c-text);
  margin-bottom: 6px;
}

.client-tag {
  display: block;
  font-size: 0.75rem;
  color: var(--c-text-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* ── About Section ───────────────────────────────────────────── */
.section-about {
  background: var(--c-bg-elevated);
}

.about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(32px, 4vw, 48px);
}

.about-name {
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  font-weight: var(--f-weight-light);
  margin-bottom: 4px;
  letter-spacing: -0.02em;
}

.about-role {
  font-size: 0.9rem;
  color: var(--c-accent-light);
  font-weight: var(--f-weight-med);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 28px;
}

.about-bio p {
  font-size: 0.95rem;
  color: var(--c-text-dim);
  line-height: 1.7;
  margin-bottom: 16px;
}

.about-bio p:last-child {
  margin-bottom: 0;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--s-gap);
  margin-top: clamp(32px, 4vw, 48px);
  padding-top: clamp(24px, 3vw, 32px);
  border-top: 1px solid var(--c-border);
}

.stat-number {
  display: block;
  font-size: clamp(2rem, 3vw, 3rem);
  font-weight: var(--f-weight-light);
  color: var(--c-accent-light);
  letter-spacing: -0.02em;
  line-height: 1;
  margin-bottom: 8px;
}

.stat-label {
  display: block;
  font-size: 0.75rem;
  color: var(--c-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* ── Contact Section ─────────────────────────────────────────── */
.section-contact {
  background: var(--c-bg);
}

.contact-layout {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: clamp(32px, 5vw, 64px);
}

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

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

.form-group label {
  display: block;
  font-size: 0.75rem;
  font-weight: var(--f-weight-med);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--c-text-muted);
  margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  color: var(--c-text);
  font-family: var(--f-family);
  font-size: 0.9rem;
  padding: 12px 16px;
  border-radius: var(--radius);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--c-text-muted);
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--c-accent);
  box-shadow: 0 0 0 3px var(--c-accent-glow);
}

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

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.form-error {
  display: block;
  font-size: 0.75rem;
  color: var(--c-error);
  margin-top: 4px;
  min-height: 18px;
}

.btn-submit {
  grid-column: 1 / -1;
  width: 100%;
  padding: 16px;
  margin-top: 8px;
}

.btn-submit .btn-loading { display: none; }
.btn-submit.loading .btn-text { display: none; }
.btn-submit.loading .btn-loading { display: inline; }
.btn-submit.loading { opacity: 0.7; pointer-events: none; }

.form-success {
  grid-column: 1 / -1;
  display: none;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  background: rgba(52, 211, 153, 0.1);
  border: 1px solid rgba(52, 211, 153, 0.3);
  color: var(--c-success);
  font-size: 0.9rem;
  border-radius: var(--radius);
}

.form-success.visible {
  display: flex;
}

/* Contact Info */
.contact-info {
  display: flex;
  flex-direction: column;
  gap: 32px;
  padding-top: 8px;
}

.contact-info-item h4 {
  font-size: 0.75rem;
  font-weight: var(--f-weight-med);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--c-text-muted);
  margin-bottom: 8px;
}

.contact-info-item a,
.contact-info-item span {
  font-size: 0.95rem;
  color: var(--c-text);
}

.contact-info-item a:hover {
  color: var(--c-accent-light);
}

/* ── Footer ─────────────────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--c-border);
  padding: 40px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-brand {
  font-weight: var(--f-weight-bold);
  font-size: 1rem;
  letter-spacing: -0.01em;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  font-size: 0.85rem;
  color: var(--c-text-dim);
  transition: color var(--transition);
}

.footer-links a:hover {
  color: var(--c-accent-light);
}

.footer-copy {
  font-size: 0.8rem;
  color: var(--c-text-muted);
}

/* ── Animation States ───────────────────────────────────────── */
.anim-fade-up {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94),
              transform 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.anim-fade-up.in-view {
  opacity: 1;
  transform: translateY(0);
}

/* ── Responsive ──────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .approach-layout {
    grid-template-columns: 1fr;
  }

  .approach-statement {
    margin-bottom: 16px;
  }

  .contact-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  /* Nav mobile */
  .nav-toggle { display: flex; }

  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: min(320px, 85vw);
    height: 100vh;
    background: var(--c-bg-elevated);
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    padding: 48px 32px;
    gap: 24px;
    transition: right var(--transition);
    border-left: 1px solid var(--c-border);
  }

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

  .nav-menu a {
    font-size: 1.1rem;
  }

  /* Hero */
  .hero {
    min-height: 100svh;
    padding-top: 100px;
  }

  .hero-heading {
    font-size: clamp(2.4rem, 10vw, 3.5rem);
  }

  /* Contact form */
  .contact-form {
    grid-template-columns: 1fr;
  }

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

  .btn-submit {
    grid-column: 1;
  }

  .form-success {
    grid-column: 1;
  }

  /* About stats */
  .about-stats {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }

  /* Footer */
  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 480px) {
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

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

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

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

  .about-stats {
    grid-template-columns: 1fr;
    text-align: center;
  }
}

/* ── Utility: Screen Reader Only ─────────────────────────────── */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border-width: 0;
}

/* ── Mobile Nav Overlay ──────────────────────────────────────── */
.nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 17, 24, 0.6);
  z-index: 999;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}

.nav-overlay.active {
  opacity: 1;
  pointer-events: auto;
}