/* ============================================================
   KHAN SOFTWARE SOLUTIONS – Stylesheet
   Design: Dark theme, #00FF88 accent, Inter font
   ============================================================ */

/* ----------------------------------------------------------
   1. CSS Custom Properties
   ---------------------------------------------------------- */
:root {
  --clr-black:      #000000;
  --clr-dark-1:     #0a0a0a;
  --clr-dark-2:     #111111;
  --clr-dark-3:     #1a1a1a;
  --clr-light:      #f4f4f4;
  --clr-light-2:    #e8e8e8;
  --clr-green:      #00FF88;
  --clr-green-dim:  rgba(0, 255, 136, 0.1);
  --clr-green-bd:   rgba(0, 255, 136, 0.25);
  --clr-white:      #ffffff;
  --clr-text-dark:  #e0e0e0;
  --clr-text-muted: #888888;
  --clr-border-dark: rgba(255, 255, 255, 0.08);
  --clr-border-light: rgba(0, 0, 0, 0.1);

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

  --container:      1200px;
  --section-py:     clamp(64px, 8vw, 120px);
  --radius-sm:      4px;
  --radius:         8px;
  --transition:     0.3s ease;
  --shadow-card:    0 1px 3px rgba(0,0,0,0.12), 0 4px 16px rgba(0,0,0,0.08);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  font-weight: 400;
  line-height: 1.6;
  background: var(--clr-white);
  color: var(--clr-black);
  overflow-x: hidden;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { cursor: pointer; font-family: var(--font); }

/* ----------------------------------------------------------
   3. Typography
   ---------------------------------------------------------- */
h1, h2, h3, h4 {
  font-weight: 300;
  letter-spacing: -0.03em;
  line-height: 1.15;
}

/* ----------------------------------------------------------
   4. Layout Utilities
   ---------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 clamp(20px, 5vw, 48px);
}

.section {
  padding: var(--section-py) 0;
}
.section-dark  { background: var(--clr-dark-1); color: var(--clr-white); }
.section-light { background: var(--clr-light);  color: var(--clr-black); }
.section-contact { background: var(--clr-black); color: var(--clr-white); }

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 64px;
}
.section-label {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--clr-green);
  margin-bottom: 12px;
}
.section-title {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 300;
  margin-bottom: 16px;
}
.section-subtitle {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--clr-text-muted);
}
.section-header.dark .section-title   { color: var(--clr-black); }
.section-header.dark .section-subtitle { color: #555; }

/* ----------------------------------------------------------
   5. Navigation
   ---------------------------------------------------------- */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 0;
  transition: background var(--transition), box-shadow var(--transition);
  background: transparent;
}
.navbar.scrolled {
  background: rgba(0, 0, 0, 0.95);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 var(--clr-border-dark);
}
.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 clamp(20px, 5vw, 48px);
  height: 72px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.nav-logo-text {
  display: flex;
  flex-direction: column;
}
.nav-logo-name {
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--clr-white);
  letter-spacing: -0.02em;
}
.nav-logo-tagline {
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--clr-text-muted);
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}
.nav-link {
  padding: 8px 14px;
  font-size: 0.875rem;
  color: rgba(255,255,255,0.7);
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}
.nav-link:hover { color: var(--clr-white); background: rgba(255,255,255,0.06); }
.nav-link.active { color: var(--clr-white); }
.nav-link-cta {
  margin-left: 8px;
  padding: 8px 20px;
  background: var(--clr-green);
  color: var(--clr-black) !important;
  font-weight: 500;
  border-radius: var(--radius-sm);
}
.nav-link-cta:hover { background: #00e07a; }

/* Burger */
.nav-burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 40px; height: 40px;
  background: none;
  border: none;
  padding: 4px;
}
.nav-burger span {
  display: block;
  width: 22px; height: 2px;
  background: var(--clr-white);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
  transform-origin: center;
}
.nav-burger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-burger.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.nav-burger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ----------------------------------------------------------
   6. Hero
   ---------------------------------------------------------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--clr-black);
  color: var(--clr-white);
  overflow: hidden;
  padding: 120px 0 80px;
}
.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.hero-grid {
  width: 100%; height: 100%;
  background-image:
    linear-gradient(rgba(0, 255, 136, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 255, 136, 0.04) 1px, transparent 1px);
  background-size: 64px 64px;
  animation: gridDrift 24s linear infinite;
}
@keyframes gridDrift {
  0%   { transform: translate(0, 0); }
  100% { transform: translate(64px, 64px); }
}
.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 20% 50%, rgba(0,255,136,0.06) 0%, transparent 60%),
              radial-gradient(ellipse 60% 80% at 80% 80%, rgba(0,80,255,0.04) 0%, transparent 60%);
}
.hero .container { position: relative; z-index: 1; }
.hero-content { max-width: 720px; }
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 16px;
  border: 1px solid var(--clr-green-bd);
  background: var(--clr-green-dim);
  border-radius: 100px;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--clr-green);
  margin-bottom: 28px;
}
.hero-badge-dot {
  width: 8px; height: 8px;
  background: var(--clr-green);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.85); }
}
.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 300;
  letter-spacing: -0.04em;
  line-height: 1.1;
  margin-bottom: 24px;
}
.text-green { color: var(--clr-green); }
.hero-subtitle {
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  line-height: 1.75;
  color: rgba(255,255,255,0.6);
  max-width: 580px;
  margin-bottom: 40px;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 48px;
}
.hero-trust {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  font-size: 0.8rem;
  color: rgba(255,255,255,0.4);
}
.hero-trust-divider { color: var(--clr-green); opacity: 0.5; }
.hero-scroll-indicator {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
}
.hero-scroll-indicator span {
  display: block;
  width: 1px;
  height: 56px;
  background: linear-gradient(to bottom, rgba(0,255,136,0.6), transparent);
  animation: scrollLine 2s ease-in-out infinite;
}
@keyframes scrollLine {
  0%   { transform: scaleY(0); transform-origin: top; opacity: 1; }
  50%  { transform: scaleY(1); transform-origin: top; opacity: 1; }
  100% { transform: scaleY(1); transform-origin: bottom; opacity: 0; }
}

/* ----------------------------------------------------------
   7. Buttons
   ---------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  transition: all var(--transition);
  cursor: pointer;
  white-space: nowrap;
}
.btn-primary {
  background: var(--clr-green);
  color: var(--clr-black);
  border-color: var(--clr-green);
}
.btn-primary:hover {
  background: #00e07a;
  border-color: #00e07a;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0,255,136,0.25);
}
.btn-outline {
  background: transparent;
  color: var(--clr-white);
  border-color: rgba(255,255,255,0.25);
}
.btn-outline:hover {
  background: rgba(255,255,255,0.06);
  border-color: rgba(255,255,255,0.5);
}

/* ----------------------------------------------------------
   8. Stats
   ---------------------------------------------------------- */
.stats {
  background: var(--clr-dark-2);
  padding: 56px 0;
  border-top: 1px solid var(--clr-border-dark);
  border-bottom: 1px solid var(--clr-border-dark);
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--clr-border-dark);
}
.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 32px 24px;
  background: var(--clr-dark-2);
  text-align: center;
  transition: background var(--transition);
}
.stat-item:hover { background: var(--clr-dark-3); }
.stat-number {
  font-size: clamp(2.25rem, 4vw, 3rem);
  font-weight: 300;
  color: var(--clr-green);
  letter-spacing: -0.04em;
  line-height: 1;
}
.stat-suffix {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 300;
  color: var(--clr-green);
  letter-spacing: -0.04em;
  line-height: 1;
}
.stat-label {
  font-size: 0.8rem;
  color: var(--clr-text-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-top: 8px;
}

/* ----------------------------------------------------------
   9. Services
   ---------------------------------------------------------- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--clr-border-dark);
  border: 1px solid var(--clr-border-dark);
}
.service-card {
  background: var(--clr-dark-2);
  padding: 32px;
  transition: background var(--transition);
  cursor: default;
}
.service-card:hover {
  background: var(--clr-dark-3);
}
.service-card:hover .service-card-icon svg {
  color: var(--clr-green);
}
.service-card-icon {
  width: 44px; height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--clr-border-dark);
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
  transition: border-color var(--transition), background var(--transition);
}
.service-card:hover .service-card-icon {
  border-color: var(--clr-green-bd);
  background: var(--clr-green-dim);
}
.service-card-icon svg {
  color: rgba(255,255,255,0.6);
  transition: color var(--transition);
}
.service-card-title {
  font-size: 1rem;
  font-weight: 500;
  color: var(--clr-white);
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}
.service-card-desc {
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--clr-text-muted);
  margin-bottom: 16px;
}
.service-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.tag {
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  color: rgba(255,255,255,0.4);
  border: 1px solid var(--clr-border-dark);
  border-radius: 100px;
  padding: 3px 10px;
  transition: color var(--transition), border-color var(--transition);
}
.service-card:hover .tag {
  color: var(--clr-green);
  border-color: var(--clr-green-bd);
}

/* ----------------------------------------------------------
   10. Solutions
   ---------------------------------------------------------- */
.solutions-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.solution-card {
  background: var(--clr-white);
  border: 1px solid var(--clr-border-light);
  border-top: 3px solid var(--clr-black);
  padding: 32px;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}
.solution-card:hover {
  border-top-color: var(--clr-green);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}
.solution-num {
  display: block;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--clr-green);
  margin-bottom: 12px;
}
.solution-title {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--clr-black);
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}
.solution-desc {
  font-size: 0.875rem;
  line-height: 1.7;
  color: #555;
  margin-bottom: 20px;
}
.solution-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.solution-list li {
  font-size: 0.8rem;
  color: #444;
  padding-left: 16px;
  position: relative;
}
.solution-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 6px; height: 1px;
  background: var(--clr-green);
}

/* ----------------------------------------------------------
   11. Process
   ---------------------------------------------------------- */
.process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  position: relative;
}
.process-grid::before {
  content: '';
  position: absolute;
  top: 28px;
  left: calc(12.5% + 28px);
  right: calc(12.5% + 28px);
  height: 1px;
  background: linear-gradient(90deg, var(--clr-green-bd), var(--clr-green-bd) 50%, transparent);
  background-size: 12px 1px;
  background-repeat: repeat-x;
}
.process-step {
  padding: 0 24px;
  position: relative;
}
.process-step-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 24px;
}
.process-step-icon {
  width: 56px; height: 56px;
  background: var(--clr-dark-3);
  border: 1px solid var(--clr-border-dark);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background var(--transition), border-color var(--transition);
}
.process-step:hover .process-step-icon {
  background: var(--clr-green-dim);
  border-color: var(--clr-green-bd);
}
.process-step-icon svg { color: rgba(255,255,255,0.6); }
.process-step:hover .process-step-icon svg { color: var(--clr-green); }
.process-step-num {
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--clr-green);
  opacity: 0.6;
}
.process-step-title {
  font-size: 1rem;
  font-weight: 500;
  color: var(--clr-white);
  margin-bottom: 10px;
}
.process-step-desc {
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--clr-text-muted);
}

/* ----------------------------------------------------------
   12. Technologies
   ---------------------------------------------------------- */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.tech-card {
  background: var(--clr-white);
  border: 1px solid var(--clr-border-light);
  padding: 28px 32px;
  border-radius: var(--radius);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.tech-card:hover {
  border-color: #ccc;
  box-shadow: var(--shadow-card);
}
.tech-category {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--clr-green);
  margin-bottom: 16px;
}
.tech-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.tech-list li {
  font-size: 0.875rem;
  color: #333;
  padding: 6px 0;
  border-bottom: 1px solid var(--clr-border-light);
  display: flex;
  align-items: center;
  gap: 8px;
}
.tech-list li:last-child { border-bottom: none; }
.tech-list li::before {
  content: '';
  width: 4px; height: 4px;
  background: var(--clr-green);
  border-radius: 50%;
  flex-shrink: 0;
}

/* ----------------------------------------------------------
   13. About
   ---------------------------------------------------------- */
.about-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.about-content .section-title { text-align: left; margin-bottom: 24px; }
.about-text {
  font-size: 0.95rem;
  line-height: 1.8;
  color: rgba(255,255,255,0.6);
  margin-bottom: 16px;
}
.about-values {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-top: 32px;
}
.about-value {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}
.about-value-dot {
  width: 8px; height: 8px;
  background: var(--clr-green);
  border-radius: 50%;
  flex-shrink: 0;
  margin-top: 6px;
}
.about-value strong {
  display: block;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--clr-white);
  margin-bottom: 4px;
}
.about-value p {
  font-size: 0.85rem;
  color: var(--clr-text-muted);
  line-height: 1.6;
}
.about-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}
.about-visual-inner {
  width: 320px; height: 320px;
  background: var(--clr-dark-3);
  border: 1px solid var(--clr-border-dark);
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 24px;
  position: relative;
}
.about-visual-inner::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: 50%;
  background: conic-gradient(var(--clr-green) 25%, transparent 25%);
  -webkit-mask: radial-gradient(farthest-side, transparent calc(100% - 2px), white calc(100% - 1px));
  mask: radial-gradient(farthest-side, transparent calc(100% - 2px), white calc(100% - 1px));
  opacity: 0.3;
}
.about-stat-num {
  font-size: 3rem;
  font-weight: 300;
  color: var(--clr-green);
  letter-spacing: -0.06em;
}
.about-stat-sub {
  font-size: 0.75rem;
  color: var(--clr-text-muted);
  letter-spacing: 0.06em;
  text-align: center;
  max-width: 160px;
  line-height: 1.4;
}
.about-badges {
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: center;
}
.about-badge {
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--clr-green);
  border: 1px solid var(--clr-green-bd);
  padding: 4px 14px;
  border-radius: 100px;
}

/* ----------------------------------------------------------
   14. Contact
   ---------------------------------------------------------- */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 80px;
  align-items: start;
}
.contact-info .section-title { text-align: left; }
.contact-info .section-label  { display: block; margin-bottom: 12px; }
.contact-text {
  font-size: 0.95rem;
  line-height: 1.8;
  color: rgba(255,255,255,0.5);
  margin-bottom: 40px;
}
.contact-details {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.contact-detail {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}
.contact-detail-icon {
  width: 40px; height: 40px;
  background: var(--clr-green-dim);
  border: 1px solid var(--clr-green-bd);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--clr-green);
}
.contact-detail-label {
  display: block;
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--clr-text-muted);
  margin-bottom: 2px;
}
.contact-detail-value {
  font-size: 0.9rem;
  color: var(--clr-white);
  transition: color var(--transition);
}
a.contact-detail-value:hover { color: var(--clr-green); }

/* ----------------------------------------------------------
   15. Forms
   ---------------------------------------------------------- */
.contact-form-wrapper {
  background: var(--clr-dark-2);
  border: 1px solid var(--clr-border-dark);
  border-radius: var(--radius);
  padding: 40px;
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 20px;
}
.form-label {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.5);
}
.required { color: var(--clr-green); }
.form-input {
  width: 100%;
  background: var(--clr-dark-3);
  border: 1px solid var(--clr-border-dark);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-size: 0.9rem;
  font-family: var(--font);
  color: var(--clr-white);
  transition: border-color var(--transition), box-shadow var(--transition);
  appearance: none;
  -webkit-appearance: none;
}
.form-input::placeholder { color: rgba(255,255,255,0.25); }
.form-input:focus {
  outline: none;
  border-color: var(--clr-green-bd);
  box-shadow: 0 0 0 3px rgba(0,255,136,0.08);
}
.form-input.error { border-color: #e05555; }
.form-select { cursor: pointer; }
.form-select option { background: var(--clr-dark-2); color: var(--clr-white); }
.form-textarea { resize: vertical; min-height: 140px; }
.form-message {
  margin-bottom: 16px;
  font-size: 0.875rem;
  line-height: 1.5;
  border-radius: var(--radius-sm);
  padding: 0;
  transition: all var(--transition);
}
.form-message.success {
  color: var(--clr-green);
  background: var(--clr-green-dim);
  border: 1px solid var(--clr-green-bd);
  padding: 12px 16px;
}
.form-message.error {
  color: #ff7070;
  background: rgba(255,80,80,0.08);
  border: 1px solid rgba(255,80,80,0.25);
  padding: 12px 16px;
}
.btn-submit {
  width: 100%;
  padding: 16px 32px;
  background: var(--clr-green);
  color: var(--clr-black);
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  position: relative;
  overflow: hidden;
}
.btn-submit:hover:not(:disabled) {
  background: #00e07a;
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(0,255,136,0.3);
}
.btn-submit:disabled { opacity: 0.7; cursor: not-allowed; }
.btn-loader {
  display: none;
  width: 16px; height: 16px;
  border: 2px solid rgba(0,0,0,0.3);
  border-top-color: var(--clr-black);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}
.btn-submit.loading .btn-text { display: none; }
.btn-submit.loading .btn-loader { display: block; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ----------------------------------------------------------
   16. Footer
   ---------------------------------------------------------- */
.footer {
  background: var(--clr-black);
  border-top: 1px solid var(--clr-border-dark);
  padding: 64px 0 32px;
  color: var(--clr-white);
}
.footer-top {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 64px;
  margin-bottom: 56px;
}
.footer-brand { max-width: 320px; }
.footer-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}
.footer-logo-name {
  display: block;
  font-size: 0.9rem;
  color: var(--clr-white);
}
.footer-logo-tagline {
  display: block;
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--clr-text-muted);
}
.footer-desc {
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--clr-text-muted);
}
.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.footer-nav-title {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.4);
  margin-bottom: 16px;
}
.footer-nav ul { display: flex; flex-direction: column; gap: 10px; }
.footer-nav a {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.5);
  transition: color var(--transition);
}
.footer-nav a:hover { color: var(--clr-green); }
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 24px;
  border-top: 1px solid var(--clr-border-dark);
  font-size: 0.8rem;
  color: rgba(255,255,255,0.3);
}
.footer-legal {
  display: flex;
  gap: 24px;
}
.footer-legal a { transition: color var(--transition); }
.footer-legal a:hover { color: var(--clr-white); }

/* ----------------------------------------------------------
   17. Back to Top
   ---------------------------------------------------------- */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px; height: 44px;
  background: var(--clr-dark-2);
  border: 1px solid var(--clr-border-dark);
  border-radius: 50%;
  color: var(--clr-text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--transition), transform var(--transition), color var(--transition), background var(--transition);
  pointer-events: none;
  z-index: 900;
}
.back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.back-to-top:hover {
  background: var(--clr-green-dim);
  border-color: var(--clr-green-bd);
  color: var(--clr-green);
}

/* ----------------------------------------------------------
   18. Scroll Reveal Animations
   ---------------------------------------------------------- */
[data-animate] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}
[data-animate].is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ----------------------------------------------------------
   19. Media Queries
   ---------------------------------------------------------- */
@media (max-width: 1024px) {
  .services-grid        { grid-template-columns: repeat(2, 1fr); }
  .solutions-grid       { grid-template-columns: repeat(2, 1fr); }
  .tech-grid            { grid-template-columns: repeat(2, 1fr); }
  .process-grid         { grid-template-columns: repeat(2, 1fr); row-gap: 48px; }
  .process-grid::before { display: none; }
  .about-layout         { grid-template-columns: 1fr; gap: 48px; }
  .about-visual         { display: none; }
  .contact-layout       { grid-template-columns: 1fr; gap: 48px; }
  .footer-top           { grid-template-columns: 1fr; gap: 48px; }
}

@media (max-width: 768px) {
  .nav-links { display: none; flex-direction: column; gap: 0; }
  .nav-links.open {
    display: flex;
    position: fixed;
    inset: 72px 0 0 0;
    background: rgba(0,0,0,0.97);
    padding: 24px;
    overflow-y: auto;
    border-top: 1px solid var(--clr-border-dark);
  }
  .nav-links.open .nav-link {
    padding: 16px;
    font-size: 1rem;
    border-radius: 0;
    border-bottom: 1px solid var(--clr-border-dark);
  }
  .nav-links.open .nav-link-cta {
    margin: 16px 0 0;
    border-radius: var(--radius-sm);
    justify-content: center;
  }
  .nav-burger { display: flex; }

  .services-grid  { grid-template-columns: 1fr; }
  .solutions-grid { grid-template-columns: 1fr; }
  .tech-grid      { grid-template-columns: 1fr; }
  .process-grid   { grid-template-columns: 1fr; }
  .stats-grid     { grid-template-columns: repeat(2, 1fr); }
  .form-row       { grid-template-columns: 1fr; }
  .contact-form-wrapper { padding: 24px; }
  .footer-nav { grid-template-columns: 1fr 1fr; }
  .footer-bottom { flex-direction: column; gap: 16px; text-align: center; }
  .back-to-top { bottom: 20px; right: 20px; }
}

@media (max-width: 480px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; }
  .footer-nav { grid-template-columns: 1fr; }
}