/* ===== Variables ===== */
:root {
  --color-bg: #0a0a0c;
  --color-surface: #111114;
  --color-surface-alt: #18181c;
  --color-surface-elevated: #1e1e24;
  --color-text: #f4f4f5;
  --color-text-muted: #a1a1aa;
  --color-text-subtle: #71717a;
  --color-accent: #10b981;
  --color-accent-hover: #059669;
  --color-accent-glow: rgba(16, 185, 129, 0.15);
  --color-border: #27272a;
  --color-border-light: #3f3f46;
  --color-warning: #f59e0b;
  --color-blue: #3b82f6;
  --color-purple: #8b5cf6;
  --font-sans: 'Outfit', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --radius: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --transition: 0.2s ease;
  --transition-slow: 0.3s ease;
  --shadow-lg: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  --max-width: 1140px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  min-height: 100vh;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

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

a:hover {
  color: var(--color-accent-hover);
}

strong {
  color: var(--color-text);
  font-weight: 600;
}

ul {
  list-style: none;
}

/* ===== Header & Nav ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(10, 10, 12, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
}

.nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-accent);
}

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

.nav-links a {
  color: var(--color-text-muted);
  font-weight: 500;
  font-size: 0.9rem;
  transition: color var(--transition);
}

.nav-links a:hover {
  color: var(--color-text);
}

.nav-cta {
  background: var(--color-accent);
  color: var(--color-bg) !important;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
}

.nav-cta:hover {
  background: var(--color-accent-hover);
  color: var(--color-bg) !important;
}

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

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: transform var(--transition);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.875rem 1.75rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 1rem;
  transition: all var(--transition);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-bg);
  box-shadow: 0 0 20px var(--color-accent-glow);
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 0 30px var(--color-accent-glow);
  color: var(--color-bg);
}

.btn-secondary {
  background: transparent;
  border: 2px solid var(--color-border-light);
  color: var(--color-text);
}

.btn-secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn-large {
  padding: 1rem 2rem;
  font-size: 1.05rem;
}

.btn-xl {
  padding: 1.25rem 2.5rem;
  font-size: 1.1rem;
}

/* ===== Hero Section ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8rem 1.5rem 6rem;
  text-align: center;
  background: radial-gradient(ellipse at top, var(--color-surface) 0%, var(--color-bg) 70%);
}

.hero-content {
  max-width: 900px;
}

.hero-badge {
  display: inline-block;
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  color: var(--color-accent);
  padding: 0.5rem 1.25rem;
  border-radius: 50px;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 1.5rem;
}

.hero-headline {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 1.5rem;
  background: linear-gradient(135deg, var(--color-text) 0%, var(--color-text-muted) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subheadline {
  font-size: 1.25rem;
  color: var(--color-text-muted);
  max-width: 700px;
  margin: 0 auto 2.5rem;
  line-height: 1.8;
}

.hero-proof {
  display: flex;
  justify-content: center;
  gap: 3rem;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}

.proof-item {
  text-align: center;
}

.proof-number {
  display: block;
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
}

.proof-label {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.hero-cta {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.hero-note {
  font-size: 0.875rem;
  color: var(--color-text-subtle);
}

/* ===== Sections ===== */
.section {
  padding: 6rem 1.5rem;
}

.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

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

.section-cta {
  background: linear-gradient(180deg, var(--color-surface) 0%, var(--color-bg) 100%);
}

.section-eyebrow {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.75rem;
  text-align: center;
}

.section-title {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 700;
  text-align: center;
  margin-bottom: 1rem;
}

.section-title-left {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 700;
  margin-bottom: 2rem;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  text-align: center;
  max-width: 600px;
  margin: 0 auto 3rem;
}

/* ===== Problems Section ===== */
.problems-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

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

.problem-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
}

.problem-card p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

.solution-intro {
  background: var(--color-accent-glow);
  border: 1px solid rgba(16, 185, 129, 0.2);
  border-radius: var(--radius-md);
  padding: 1.5rem 2rem;
}

.solution-intro p {
  color: var(--color-text);
  font-size: 1.05rem;
  line-height: 1.8;
}

/* ===== Solutions Grid ===== */
.solutions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 1.5rem;
}

.solution-card {
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
  transition: border-color var(--transition), transform var(--transition);
}

.solution-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-4px);
}

.solution-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.solution-icon {
  font-size: 2rem;
}

.solution-header h4 {
  font-size: 1.25rem;
  font-weight: 600;
}

.solution-description {
  color: var(--color-text-muted);
  margin-bottom: 1.25rem;
  line-height: 1.7;
}

.solution-benefits {
  margin-bottom: 1.25rem;
}

.solution-benefits li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--color-text);
  font-size: 0.95rem;
}

.solution-benefits li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: bold;
}

.solution-ideal {
  font-size: 0.85rem;
  color: var(--color-text-subtle);
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
  font-style: italic;
}

/* ===== Case Studies ===== */
.case-studies {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.case-study {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2.5rem;
  transition: border-color var(--transition);
}

.case-study:hover {
  border-color: var(--color-border-light);
}

.case-study-badge {
  display: inline-block;
  background: var(--color-accent-glow);
  color: var(--color-accent);
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.case-study-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.case-study-keyfocus {
  font-size: 0.95rem;
  color: var(--color-text-subtle);
  font-style: italic;
  margin-bottom: 1.25rem;
  line-height: 1.5;
}

.case-study-context,
.case-study-solution,
.case-study-results {
  margin-bottom: 1.5rem;
}

.case-study h5 {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
}

.case-study p {
  color: var(--color-text-muted);
  line-height: 1.8;
}

.case-study-results ul {
  display: grid;
  gap: 0.5rem;
}

.case-study-results li {
  position: relative;
  padding-left: 1.5rem;
  color: var(--color-text);
}

.case-study-results li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--color-accent);
}

/* Contribution list in case studies */
.contribution-list {
  display: grid;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.contribution-list li {
  position: relative;
  padding-left: 1.5rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.contribution-list li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: bold;
}

.case-study-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

.case-study-tech span {
  font-size: 0.75rem;
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  padding: 0.3rem 0.7rem;
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
}

/* ===== Expertise Section ===== */
.expertise-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-bottom: 4rem;
}

.expertise-card {
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
}

.expertise-card h4 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--color-border);
}

.expertise-list li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 0;
  color: var(--color-text-muted);
}

.expertise-list .check {
  color: var(--color-accent);
  font-weight: bold;
}

/* Tech Stack */
.tech-stack {
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2.5rem;
}

.tech-stack-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  text-align: center;
}

.tech-stack-intro {
  color: var(--color-text-muted);
  text-align: center;
  margin-bottom: 2rem;
}

.tech-categories {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
}

.tech-category h5 {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: 0.75rem;
}

.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.tech-tags span {
  font-size: 0.8rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: 0.3rem 0.6rem;
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
}

/* ===== Methodology Section ===== */
.methodology-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}

.methodology-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
  position: relative;
}

.methodology-number {
  font-size: 3rem;
  font-weight: 700;
  color: var(--color-surface-elevated);
  position: absolute;
  top: 1rem;
  right: 1.5rem;
  line-height: 1;
}

.methodology-card h4 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--color-accent);
}

.methodology-card p {
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* ===== FAQ Section ===== */
.faq-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(480px, 1fr));
  gap: 1.5rem;
}

.faq-item {
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.75rem;
}

.faq-question {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--color-text);
}

.faq-answer {
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* ===== CTA Section ===== */
.cta-headline {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  text-align: center;
  margin-bottom: 1rem;
}

.cta-description {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  text-align: center;
  max-width: 650px;
  margin: 0 auto 2rem;
  line-height: 1.8;
}

.cta-benefits {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}

.cta-benefit {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-text-muted);
}

.check-circle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 1.5rem;
  height: 1.5rem;
  background: var(--color-accent);
  color: var(--color-bg);
  border-radius: 50%;
  font-size: 0.75rem;
  font-weight: bold;
}

.cta-buttons {
  text-align: center;
  margin-bottom: 3rem;
}

/* Contact Form */
.contact-form {
  max-width: 600px;
  margin: 0 auto 3rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

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

.form-group label {
  display: block;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 0.5rem;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.875rem 1rem;
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 1rem;
  transition: border-color var(--transition), box-shadow var(--transition);
}

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

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

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

.contact-form .btn {
  width: 100%;
}

.contact-alternatives {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
}

.contact-alternatives > p {
  color: var(--color-text-subtle);
  margin-bottom: 1rem;
}

.contact-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
}

.contact-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

.contact-link:hover {
  color: var(--color-accent);
}

.contact-email {
  cursor: default;
  user-select: text;
}

.contact-email:hover {
  color: var(--color-text-muted);
}

.contact-icon {
  font-size: 1.25rem;
}

/* ===== Footer ===== */
.footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 4rem 1.5rem 2rem;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-logo {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-accent);
  display: block;
  margin-bottom: 1rem;
}

.footer-brand p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

.footer-links h5,
.footer-services h5 {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--color-text);
}

.footer-links ul,
.footer-services ul {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-links a,
.footer-services li {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

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

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.footer-bottom p {
  color: var(--color-text-subtle);
  font-size: 0.875rem;
}

/* Utility */
.hidden {
  display: none;
}

/* ===== Animations ===== */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .faq-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-inner {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 1.5rem;
    gap: 1rem;
  }

  .nav-toggle {
    display: flex;
  }

  .hero {
    padding: 6rem 1.5rem 4rem;
    min-height: auto;
  }

  .hero-proof {
    gap: 2rem;
  }

  .proof-number {
    font-size: 2rem;
  }

  .hero-cta {
    flex-direction: column;
    align-items: center;
  }

  .btn-large,
  .btn-xl {
    width: 100%;
    max-width: 300px;
  }

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

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

  .case-study {
    padding: 1.5rem;
  }

  .case-study-title {
    font-size: 1.25rem;
  }

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

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

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

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

  .contact-links {
    flex-direction: column;
    align-items: center;
  }
}

@media (max-width: 480px) {
  .section {
    padding: 4rem 1rem;
  }

  .hero-headline {
    font-size: 2rem;
  }

  .hero-subheadline {
    font-size: 1rem;
  }

  .section-title {
    font-size: 1.75rem;
  }

  .solution-card,
  .methodology-card,
  .faq-item,
  .expertise-card {
    padding: 1.25rem;
  }
}