/* ============================================
   NexAlger — styles.css
   Minimal, dark-theme, production-ready stylesheet
   ============================================ */

/* ---------- Custom Properties ---------- */
:root {
  --clr-bg: #0c0c14;
  --clr-bg-alt: #11111e;
  --clr-surface: #16162a;
  --clr-card: #1b1b35;
  --clr-card-hover: #222248;
  --clr-border: #2a2a50;
  --clr-primary: #3b82f6;
  --clr-primary-hover: #2563eb;
  --clr-primary-glow: rgba(59, 130, 246, 0.15);
  --clr-accent: #8b5cf6;
  --clr-text: #d4d4e8;
  --clr-text-muted: #8a8aaa;
  --clr-heading: #f0f0ff;
  --clr-white: #ffffff;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 40px var(--clr-primary-glow);
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', Consolas, monospace;
  --max-w: 1120px;
  --nav-h: 72px;
  --transition: 200ms ease;
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--clr-text);
  background: var(--clr-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

a:focus-visible {
  outline: 2px solid var(--clr-primary);
  outline-offset: 2px;
  border-radius: 2px;
}

ul, ol {
  list-style: none;
}

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

button:focus-visible {
  outline: 2px solid var(--clr-primary);
  outline-offset: 2px;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4 {
  color: var(--clr-heading);
  line-height: 1.25;
  font-weight: 700;
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.5rem); }
h3 { font-size: clamp(1.125rem, 2vw, 1.5rem); }

p { margin-bottom: 1rem; }

small { font-size: 0.875rem; }

/* ---------- Skip Link ---------- */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 1000;
  padding: 0.75rem 1.5rem;
  background: var(--clr-primary);
  color: var(--clr-white);
  font-weight: 600;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  transition: top var(--transition);
}

.skip-link:focus {
  top: 0;
}

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

/* ---------- Header / Nav ---------- */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(12, 12, 20, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--clr-border);
  height: var(--nav-h);
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  font-size: 1.375rem;
  font-weight: 800;
  color: var(--clr-heading);
  letter-spacing: -0.02em;
}

.logo img {
  width: 36px;
  height: 36px;
}

.logo:hover {
  color: var(--clr-heading);
}

.nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav a {
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--clr-text-muted);
  transition: color var(--transition), background var(--transition);
}

.nav a:hover,
.nav a[aria-current="page"] {
  color: var(--clr-heading);
  background: var(--clr-surface);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 0.5rem;
  background: none;
  border: none;
}

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

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  font-weight: 600;
  font-size: 0.9375rem;
  border-radius: var(--radius-sm);
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
}

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

.btn-primary:hover {
  background: var(--clr-primary-hover);
  color: var(--clr-white);
  transform: translateY(-1px);
  box-shadow: var(--shadow-glow);
}

.btn-outline {
  border: 1px solid var(--clr-border);
  color: var(--clr-heading);
}

.btn-outline:hover {
  border-color: var(--clr-primary);
  color: var(--clr-primary);
  transform: translateY(-1px);
}

/* ---------- Hero ---------- */
.hero {
  padding: 6rem 0 4rem;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(ellipse at 30% 50%, rgba(59, 130, 246, 0.06) 0%, transparent 60%),
              radial-gradient(ellipse at 70% 50%, rgba(139, 92, 246, 0.04) 0%, transparent 60%);
  pointer-events: none;
}

.hero .container {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.hero-content h1 {
  margin-bottom: 1.25rem;
}

.hero-content p {
  font-size: 1.125rem;
  color: var(--clr-text-muted);
  max-width: 36rem;
  margin-bottom: 2rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.hero-image {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-image img {
  width: 100%;
  max-width: 520px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

/* ---------- Section Shared ---------- */
.section {
  padding: 5rem 0;
}

.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 3rem;
}

.section-header h2 {
  margin-bottom: 0.75rem;
}

.section-header p {
  color: var(--clr-text-muted);
  font-size: 1.0625rem;
}

/* ---------- About / Mission ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.about-text p {
  margin-bottom: 1rem;
}

.about-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.about-visual img {
  width: 100%;
  max-width: 460px;
  border-radius: var(--radius-lg);
}

/* ---------- Services ---------- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.service-card {
  background: var(--clr-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: 2rem;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
}

.service-card:hover {
  background: var(--clr-card-hover);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.service-card .icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: var(--clr-primary-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  color: var(--clr-primary);
}

.service-card h3 {
  margin-bottom: 0.625rem;
}

.service-card p {
  font-size: 0.9375rem;
  color: var(--clr-text-muted);
  margin-bottom: 0;
}

/* ---------- Why Choose Us ---------- */
.why-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.why-item {
  display: flex;
  gap: 1rem;
  padding: 1.5rem;
  background: var(--clr-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
}

.why-item .icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--clr-primary-glow);
  color: var(--clr-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.125rem;
}

.why-item h3 {
  margin-bottom: 0.375rem;
  font-size: 1.0625rem;
}

.why-item p {
  font-size: 0.875rem;
  color: var(--clr-text-muted);
  margin-bottom: 0;
}

/* ---------- Tech Stack ---------- */
.tech-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
  max-width: 720px;
  margin: 0 auto;
}

.tech-item {
  padding: 0.625rem 1.25rem;
  background: var(--clr-card);
  border: 1px solid var(--clr-border);
  border-radius: 100px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--clr-text-muted);
  font-family: var(--font-mono);
}

/* ---------- FAQ ---------- */
.faq-list {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.faq-item {
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition);
}

.faq-item[open] {
  border-color: var(--clr-primary);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 1.125rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--clr-heading);
  text-align: left;
  cursor: pointer;
  background: var(--clr-card);
  transition: background var(--transition);
}

.faq-question:hover {
  background: var(--clr-card-hover);
}

.faq-question::after {
  content: '+';
  font-size: 1.375rem;
  font-weight: 300;
  color: var(--clr-text-muted);
  transition: transform var(--transition);
  flex-shrink: 0;
  margin-left: 1rem;
}

.faq-item[open] .faq-question::after {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 1.5rem 1.125rem;
  color: var(--clr-text-muted);
  font-size: 0.9375rem;
  line-height: 1.7;
}

.faq-answer p {
  margin-bottom: 0;
}

/* ---------- CTA ---------- */
.cta {
  background: linear-gradient(135deg, var(--clr-bg-alt) 0%, var(--clr-surface) 100%);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-xl);
  padding: 4rem 2rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(ellipse at 50% 0%, rgba(59, 130, 246, 0.08) 0%, transparent 60%);
  pointer-events: none;
}

.cta h2 {
  margin-bottom: 0.75rem;
  position: relative;
}

.cta p {
  color: var(--clr-text-muted);
  max-width: 480px;
  margin: 0 auto 2rem;
  position: relative;
}

.cta .btn {
  position: relative;
}

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--clr-border);
  padding: 4rem 0 2rem;
  margin-top: 5rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2.5rem;
  margin-bottom: 3rem;
}

.footer-about p {
  font-size: 0.9375rem;
  color: var(--clr-text-muted);
  max-width: 28rem;
  margin-top: 0.75rem;
}

.footer-col h4 {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--clr-text-muted);
  margin-bottom: 1rem;
}

.footer-col a {
  display: block;
  padding: 0.3rem 0;
  font-size: 0.9375rem;
  color: var(--clr-text-muted);
}

.footer-col a:hover {
  color: var(--clr-primary);
}

.footer-bottom {
  border-top: 1px solid var(--clr-border);
  padding-top: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.875rem;
  color: var(--clr-text-muted);
}

/* ---------- Page Header ---------- */
.page-header {
  padding: 6rem 0 2rem;
  text-align: center;
}

.page-header h1 {
  margin-bottom: 0.75rem;
}

.page-header p {
  color: var(--clr-text-muted);
  font-size: 1.0625rem;
  max-width: 560px;
  margin: 0 auto;
}

/* ---------- Contact Page ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.contact-form {
  background: var(--clr-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: 2.5rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--clr-heading);
  margin-bottom: 0.375rem;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--clr-bg);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-sm);
  color: var(--clr-text);
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  transition: border-color var(--transition);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--clr-primary);
  box-shadow: 0 0 0 3px var(--clr-primary-glow);
}

.form-group textarea {
  min-height: 140px;
  resize: vertical;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.contact-card {
  background: var(--clr-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.contact-card .icon {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  border-radius: var(--radius-sm);
  background: var(--clr-primary-glow);
  color: var(--clr-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.125rem;
}

.contact-card h3 {
  font-size: 1rem;
  margin-bottom: 0.25rem;
}

.contact-card p,
.contact-card a {
  font-size: 0.9375rem;
  color: var(--clr-text-muted);
}

/* ---------- Privacy ---------- */
.privacy-content {
  max-width: 720px;
  margin: 0 auto;
}

.privacy-content h2 {
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
}

.privacy-content h3 {
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
}

.privacy-content p,
.privacy-content ul {
  color: var(--clr-text-muted);
  margin-bottom: 1rem;
}

.privacy-content ul {
  padding-left: 1.5rem;
  list-style: disc;
}

.privacy-content ul li {
  margin-bottom: 0.375rem;
}

/* ---------- Breadcrumbs ---------- */
.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 0;
  font-size: 0.875rem;
  color: var(--clr-text-muted);
}

.breadcrumbs a {
  color: var(--clr-text-muted);
}

.breadcrumbs a:hover {
  color: var(--clr-primary);
}

.breadcrumbs span {
  color: var(--clr-text-muted);
}

/* ---------- Responsive ---------- */
@media (max-width: 968px) {
  .hero .container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-content p {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-image {
    order: -1;
  }

  .hero-image img {
    max-width: 360px;
  }

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

  .about-visual {
    order: -1;
  }

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

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

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

@media (max-width: 768px) {
  .nav {
    position: fixed;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: rgba(12, 12, 20, 0.98);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--clr-border);
    flex-direction: column;
    padding: 1rem;
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform 300ms ease, opacity 300ms ease;
  }

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

  .nav a {
    width: 100%;
    padding: 0.875rem 1rem;
  }

  .nav-toggle {
    display: flex;
  }

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

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

  .section {
    padding: 3rem 0;
  }

  .hero {
    padding: 3rem 0 2rem;
  }

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

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .cta {
    padding: 2.5rem 1.5rem;
  }
}

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

  .btn {
    width: 100%;
    max-width: 280px;
  }
}

/* ---------- 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;
}

/* ---------- Reduced Motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }
}