/* ========== DESIGN TOKENS ========== */
:root {
  /* Colors: dark charcoal + slate + subtle teal/blue */
  --bg-dark: #1a1d21;
  --bg-card: #23272d;
  --bg-elevated: #2c3138;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent-teal: #2dd4bf;
  --accent-teal-dim: rgba(45, 212, 191, 0.15);
  --accent-blue: #38bdf8;
  --accent-blue-dim: rgba(56, 189, 248, 0.12);
  --border: #334155;
  --focus-ring: #38bdf8;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --section-pad: clamp(2rem, 5vw, 4rem);
  --container-max: 1100px;
  --container-narrow: 640px;

  /* Typography (system fonts) */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, sans-serif;
  --font-mono: ui-monospace, "Cascadia Code", "Source Code Pro", Menlo, monospace;

  /* Transitions */
  --ease: 0.2s ease;
}

/* ========== BASE ========== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-dark);
  -webkit-font-smoothing: antialiased;
}

/* Skip link for accessibility */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  background: var(--accent-teal);
  color: var(--bg-dark);
  font-weight: 600;
  z-index: 100;
  border-radius: 4px;
  transition: top var(--ease);
}
.skip-link:focus {
  top: var(--space-md);
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

a {
  color: var(--accent-blue);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}
a:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

/* ========== LAYOUT ========== */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: clamp(var(--space-lg), 4vw, var(--space-2xl));
}

.container-narrow {
  max-width: var(--container-narrow);
}

/* ========== HEADER / NAV ========== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(26, 29, 33, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  max-width: var(--container-max);
  margin-inline: auto;
  padding: var(--space-md) clamp(var(--space-lg), 4vw, var(--space-2xl));
}

.nav-logo {
  font-weight: 700;
  color: var(--text-primary);
  font-size: 1.1rem;
}
.nav-logo:hover {
  text-decoration: none;
  color: var(--accent-teal);
}

.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  color: var(--text-primary);
}
.nav-toggle:hover,
.nav-toggle:focus-visible {
  border-color: var(--accent-teal);
  background: var(--accent-teal-dim);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  margin-inline: auto;
  background: currentColor;
  border-radius: 1px;
  transition: transform var(--ease), opacity var(--ease);
}

.nav-menu {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  list-style: none;
  margin: 0;
  padding: 0;
}
@media (max-width: 699px) {
  .nav-menu {
    display: none;
    width: 100%;
    flex-direction: column;
    padding-top: var(--space-sm);
  }
  .nav-menu.is-open {
    display: flex;
  }
  .nav-menu a {
    display: block;
    padding: var(--space-sm) var(--space-md);
    color: var(--text-secondary);
  }
  .nav-menu a:hover {
    color: var(--text-primary);
  }
}
@media (min-width: 700px) {
  .nav-toggle {
    display: none;
  }
}

.nav-menu a {
  padding: var(--space-xs) var(--space-sm);
  color: var(--text-secondary);
  border-radius: 4px;
}
.nav-menu a:hover {
  color: var(--text-primary);
  background: var(--accent-teal-dim);
  text-decoration: none;
}

/* ========== HERO ========== */
.hero {
  display: grid;
  gap: var(--space-2xl);
  align-items: center;
  min-height: min(85vh, 560px);
  padding: var(--section-pad) clamp(var(--space-lg), 4vw, var(--space-2xl));
  background: linear-gradient(180deg, var(--bg-dark) 0%, var(--bg-card) 100%);
}
@media (min-width: 700px) {
  .hero {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
  }
}

.hero-content {
  max-width: 540px;
}

.hero-title {
  margin: 0 0 var(--space-lg);
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.hero-subhead {
  margin: 0 0 var(--space-xl);
  font-size: 1.1rem;
  color: var(--text-secondary);
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.hero-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
}
.hero-svg {
  width: 100%;
  max-width: 360px;
  height: auto;
  color: var(--accent-teal);
  opacity: 0.9;
}

/* ========== BUTTONS ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-md) var(--space-xl);
  font-size: 1rem;
  font-weight: 600;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  transition: background var(--ease), color var(--ease), transform 0.15s ease;
}
.btn:hover {
  text-decoration: none;
}
.btn:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

.btn-primary {
  background: var(--accent-teal);
  color: var(--bg-dark);
}
.btn-primary:hover {
  background: #26b5a8;
  color: var(--bg-dark);
  transform: translateY(-1px);
}

.btn-secondary {
  background: transparent;
  color: var(--accent-blue);
  border: 2px solid var(--accent-blue);
}
.btn-secondary:hover {
  background: var(--accent-blue-dim);
  color: var(--text-primary);
  text-decoration: none;
  transform: translateY(-1px);
}

/* ========== SECTIONS ========== */
.section {
  padding: var(--section-pad) 0;
}
.section:nth-of-type(even) {
  background: var(--bg-card);
}

.section-title {
  margin: 0 0 var(--space-md);
  font-size: clamp(1.5rem, 3vw, 1.75rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.section-intro {
  margin: 0 0 var(--space-2xl);
  max-width: 560px;
  color: var(--text-secondary);
  font-size: 1.05rem;
}

/* ========== CARDS (SERVICES) ========== */
.cards {
  display: grid;
  gap: var(--space-xl);
  grid-template-columns: 1fr;
}
@media (min-width: 700px) {
  .cards {
    grid-template-columns: repeat(3, 1fr);
  }
}

.card {
  padding: var(--space-xl);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: border-color var(--ease), box-shadow var(--ease);
}
.card:hover {
  border-color: var(--accent-teal);
  box-shadow: 0 0 0 1px var(--accent-teal-dim);
}

.card-title {
  margin: 0 0 var(--space-lg);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
}

.card-list {
  margin: 0 0 var(--space-lg);
  padding-left: 1.25rem;
  color: var(--text-secondary);
}
.card-list li {
  margin-bottom: var(--space-sm);
}

.card-outcome {
  margin: 0;
  padding-top: var(--space-md);
  border-top: 1px solid var(--border);
  font-size: 0.95rem;
  color: var(--text-secondary);
}
.card-outcome strong {
  color: var(--text-primary);
}

/* ========== PROCESS (APPROACH) ========== */
.process-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-xl);
}
@media (min-width: 600px) {
  .process-list {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (min-width: 900px) {
  .process-list {
    grid-template-columns: repeat(4, 1fr);
  }
}

.process-step {
  display: flex;
  gap: var(--space-lg);
  align-items: flex-start;
}
.process-step h3 {
  margin: 0 0 var(--space-sm);
  font-size: 1.1rem;
  font-weight: 700;
}
.process-step p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.process-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  color: var(--accent-teal);
}
.process-icon svg {
  width: 100%;
  height: 100%;
}

/* ========== ABOUT ========== */
.about-bio p {
  margin: 0 0 var(--space-lg);
  color: var(--text-secondary);
}
.about-bio p:last-child {
  margin-bottom: 0;
}

/* ========== CREDIBILITY ========== */
.credibility-note {
  margin: 0 0 var(--space-2xl);
  font-size: 1.1rem;
  color: var(--text-primary);
  font-weight: 500;
}

.credibility-columns {
  display: grid;
  gap: var(--space-xl);
  grid-template-columns: 1fr;
  margin-bottom: var(--space-2xl);
}
@media (min-width: 600px) {
  .credibility-columns {
    grid-template-columns: repeat(3, 1fr);
  }
}

.credibility-col-title {
  margin: 0 0 var(--space-sm);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent-teal);
}
.credibility-col p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.disclaimer {
  margin: 0;
  font-size: 0.8rem;
  color: var(--text-muted);
  max-width: 560px;
}

/* ========== CONTACT ========== */
.contact-intro {
  margin: 0 0 var(--space-xl);
  color: var(--text-secondary);
  font-size: 1.05rem;
}

.contact-cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.contact-note {
  margin: 0;
  font-size: 0.95rem;
  color: var(--text-muted);
}

/* ========== FOOTER ========== */
.site-footer {
  padding: var(--space-xl) 0;
  border-top: 1px solid var(--border);
  background: var(--bg-card);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.footer-copy {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: var(--space-lg);
  list-style: none;
  margin: 0;
  padding: 0;
}
.footer-links a {
  color: var(--text-secondary);
}
.footer-links a:hover {
  color: var(--accent-teal);
}