/* =========================================================
   Kaidon Labs — styles.css
   Blue / gray / white palette with a single accent color.
   Mobile-first, responsive (tested conceptually at 375 / 768 / 1440px).
   ========================================================= */

/* ---------- Design tokens ---------- */
:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f5f7fa;
  --color-surface: #ffffff;
  --color-border: #e2e8f0;

  --color-text: #1a2233;
  --color-text-muted: #5b6b82;
  --color-text-inverse: #ffffff;

  --color-primary: #14335c;      /* deep blue */
  --color-primary-dark: #0c2038;
  --color-primary-light: #2c5490;

  --color-accent: #16b8a6;       /* teal accent */
  --color-accent-dark: #0f9b8b;

  --color-gray-900: #0f172a;
  --color-gray-700: #334155;
  --color-gray-500: #64748b;
  --color-gray-200: #e2e8f0;
  --color-gray-100: #f1f5f9;

  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif;
  --font-heading: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;

  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 20px 50px rgba(15, 23, 42, 0.12);

  --max-width: 1200px;
  --nav-height: 72px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + 12px);
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img,
svg {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-heading);
  line-height: 1.2;
  margin: 0 0 0.6em;
  color: var(--color-gray-900);
  font-weight: 700;
}

p {
  margin: 0 0 1em;
}

button {
  font-family: inherit;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- Layout helpers ---------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: 24px;
}

.section {
  padding: 88px 0;
}

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

.section-header {
  max-width: 640px;
  margin: 0 0 48px;
}

.section-header.center {
  margin-inline: auto;
  text-align: center;
}

.eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent-dark);
  margin-bottom: 12px;
}

.section-header h2 {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  margin-bottom: 14px;
}

.section-header p {
  color: var(--color-text-muted);
  font-size: 1.05rem;
  margin-bottom: 0;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.98rem;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease,
    color 0.15s ease, border-color 0.15s ease;
  white-space: nowrap;
}

.btn:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

.btn-primary {
  background: var(--color-accent);
  color: #06231f;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background: var(--color-accent-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-secondary:hover {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  transform: translateY(-1px);
}

.btn-light {
  background: var(--color-text-inverse);
  color: var(--color-primary);
}

.btn-light:hover {
  background: var(--color-gray-100);
  transform: translateY(-1px);
}

.btn-block {
  width: 100%;
}

.btn-sm {
  padding: 9px 18px;
  font-size: 0.9rem;
}

/* ---------- Navbar ---------- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--color-border);
  height: var(--nav-height);
  display: flex;
  align-items: center;
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--color-gray-900);
}

.brand-mark {
  width: 34px;
  height: 34px;
  flex-shrink: 0;
}

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

.nav-links a:not(.btn) {
  font-weight: 500;
  color: var(--color-gray-700);
  padding: 8px 2px;
  position: relative;
}

.nav-links a:not(.btn)::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width 0.2s ease;
}

.nav-links a:not(.btn):hover::after {
  width: 100%;
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  margin-inline: auto;
  background: var(--color-gray-900);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- Hero ---------- */
.hero {
  padding: 72px 0 96px;
  background: linear-gradient(180deg, #f8fafc 0%, #ffffff 100%);
  overflow: hidden;
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  align-items: center;
}

.hero-content h1 {
  font-size: clamp(2.1rem, 5vw, 3.4rem);
  margin-bottom: 20px;
}

.hero-content .tagline {
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  color: var(--color-text-muted);
  max-width: 46ch;
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 28px;
}

.hero-trust {
  font-size: 0.92rem;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
}

.hero-trust svg {
  width: 18px;
  height: 18px;
  color: var(--color-accent-dark);
  flex-shrink: 0;
}

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

.hero-visual svg {
  width: 100%;
  height: auto;
  max-width: 480px;
}

/* ---------- Logo strip / stats ---------- */
.stats-strip {
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-primary);
}

.stats-strip .container {
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  gap: 24px;
  padding-block: 40px;
}

.stat {
  text-align: center;
  color: var(--color-text-inverse);
}

.stat strong {
  display: block;
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--color-accent);
}

.stat span {
  font-size: 0.9rem;
  color: #cbd5e1;
}

/* ---------- Services ---------- */
.services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.service-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 32px 28px;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-accent);
}

.service-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  background: rgba(22, 184, 166, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.service-icon svg {
  width: 26px;
  height: 26px;
  color: var(--color-accent-dark);
}

.service-card h3 {
  font-size: 1.15rem;
  margin-bottom: 10px;
}

.service-card p {
  color: var(--color-text-muted);
  font-size: 0.98rem;
  margin-bottom: 0;
}

/* ---------- Expertise / What We Do ---------- */
.expertise {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border-radius: var(--radius-lg);
  margin-inline: 24px;
  padding: 64px 40px;
}

.expertise-inner {
  max-width: var(--max-width);
  margin-inline: auto;
}

.expertise .section-header h2,
.expertise .section-header p {
  color: var(--color-text-inverse);
}

.expertise .section-header p {
  color: #cbd5e1;
}

.expertise-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-top: 40px;
}

.expertise-item h4 {
  color: var(--color-text-inverse);
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.05rem;
}

.expertise-item h4 svg {
  width: 20px;
  height: 20px;
  color: var(--color-accent);
  flex-shrink: 0;
}

.expertise-item p {
  color: #cbd5e1;
  font-size: 0.95rem;
  margin-bottom: 0;
}

.trust-line {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  font-size: 1.05rem;
  font-weight: 600;
  text-align: center;
  color: var(--color-text-inverse);
}

/* ---------- Blog teaser ---------- */
.blog-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-bottom: 40px;
}

.blog-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 26px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.blog-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.blog-card .blog-tag {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-accent-dark);
}

.blog-card h3 {
  font-size: 1.1rem;
  margin-bottom: 4px;
}

.blog-card p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  margin-bottom: 0;
  flex-grow: 1;
}

.blog-card .read-more {
  font-weight: 600;
  color: var(--color-primary);
  font-size: 0.92rem;
}

.blog-teaser-footer {
  text-align: center;
}

/* ---------- Closing CTA ---------- */
.cta-band {
  background: linear-gradient(120deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-text-inverse);
  border-radius: var(--radius-lg);
  margin-inline: 24px;
  padding: 64px 40px;
  text-align: center;
}

.cta-band h2 {
  color: var(--color-text-inverse);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  margin-bottom: 14px;
}

.cta-band p {
  color: #cbd5e1;
  max-width: 50ch;
  margin: 0 auto 32px;
}

.cta-band .btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
}

/* ---------- Contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
}

.contact-info h3 {
  font-size: 1.2rem;
}

.contact-info p {
  color: var(--color-text-muted);
}

.contact-method {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
  font-weight: 600;
  color: var(--color-gray-900);
}

.contact-method svg {
  width: 22px;
  height: 22px;
  color: var(--color-accent-dark);
  flex-shrink: 0;
}

.contact-form {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 32px;
  box-shadow: var(--shadow-sm);
}

.form-row {
  margin-bottom: 20px;
}

.form-row label {
  display: block;
  font-weight: 600;
  font-size: 0.92rem;
  margin-bottom: 6px;
  color: var(--color-gray-900);
}

.form-row .required {
  color: var(--color-accent-dark);
}

.form-row input,
.form-row textarea,
.form-row select {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.98rem;
  background: var(--color-bg);
  color: var(--color-text);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-row input:focus,
.form-row textarea:focus,
.form-row select:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(22, 184, 166, 0.18);
}

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

.form-row select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  background-size: 16px;
  padding-right: 40px;
  cursor: pointer;
}

.form-row .field-hint {
  display: block;
  font-size: 0.82rem;
  color: var(--color-text-muted);
  font-weight: 400;
  margin-top: 2px;
}

.form-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

@media (max-width: 640px) {
  .form-grid-2 {
    grid-template-columns: 1fr;
    gap: 0;
  }
}

.form-error {
  display: none;
  color: #c0392b;
  font-size: 0.85rem;
  margin-top: 6px;
}

.form-row.has-error input,
.form-row.has-error textarea {
  border-color: #c0392b;
}

.form-row.has-error .form-error {
  display: block;
}

.form-checkbox-row {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 8px;
}

.form-checkbox-row input[type="checkbox"] {
  width: 18px;
  height: 18px;
  margin-top: 3px;
  flex-shrink: 0;
  accent-color: var(--color-accent);
}

.form-checkbox-row label {
  font-size: 0.92rem;
  color: var(--color-gray-700);
  font-weight: 500;
}

.privacy-note {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  margin-bottom: 24px;
}

.form-status {
  margin-top: 18px;
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 500;
  display: none;
}

.form-status.show {
  display: block;
}

.form-status.success {
  background: rgba(22, 184, 166, 0.12);
  color: #0f6d61;
  border: 1px solid rgba(22, 184, 166, 0.3);
}

.form-status.error {
  background: rgba(192, 57, 43, 0.1);
  color: #9c2c1f;
  border: 1px solid rgba(192, 57, 43, 0.3);
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-gray-900);
  color: #cbd5e1;
  padding: 56px 0 28px;
  margin-top: 40px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  margin-bottom: 36px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.1rem;
  color: #ffffff;
  margin-bottom: 12px;
}

.footer-brand .brand-mark {
  width: 30px;
  height: 30px;
}

.footer-col h5 {
  color: #ffffff;
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col a {
  color: #cbd5e1;
  font-size: 0.95rem;
  transition: color 0.15s ease;
}

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

.footer-social {
  display: flex;
  gap: 12px;
}

.footer-social a {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid #334155;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.15s ease, border-color 0.15s ease;
}

.footer-social a:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
}

.footer-social svg {
  width: 17px;
  height: 17px;
  color: #cbd5e1;
}

.footer-social a:hover svg {
  color: #06231f;
}

.footer-bottom {
  border-top: 1px solid #1e293b;
  padding-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 0.85rem;
  color: #94a3b8;
  text-align: center;
}

/* ---------- Blog listing / post pages (shared via scripts/build.js) ---------- */
.blog-hero {
  padding: 56px 0 24px;
  background: linear-gradient(180deg, #f8fafc 0%, #ffffff 100%);
}

.blog-hero h1 {
  font-size: clamp(1.9rem, 4vw, 2.6rem);
}

.blog-hero p {
  color: var(--color-text-muted);
  max-width: 60ch;
}

.blog-index-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.post-date {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  font-weight: 600;
}

.post-article {
  max-width: 760px;
  margin: 0 auto;
  padding: 56px 24px 96px;
}

.post-article .post-meta {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin-bottom: 8px;
}

.post-article h1 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  margin-bottom: 24px;
}

.post-body h2 {
  font-size: 1.5rem;
  margin-top: 2em;
}

.post-body h3 {
  font-size: 1.2rem;
  margin-top: 1.6em;
}

.post-body p {
  color: var(--color-gray-700);
  font-size: 1.05rem;
}

.post-body ul,
.post-body ol {
  margin: 0 0 1.2em 1.4em;
  color: var(--color-gray-700);
}

.post-body ul {
  list-style: disc;
}

.post-body ol {
  list-style: decimal;
}

.post-body li {
  margin-bottom: 0.5em;
}

.post-body a {
  color: var(--color-primary-light);
  text-decoration: underline;
}

.post-body blockquote {
  border-left: 3px solid var(--color-accent);
  padding-left: 18px;
  margin: 1.6em 0;
  color: var(--color-text-muted);
  font-style: italic;
}

.post-cta {
  margin-top: 56px;
  padding: 32px;
  border-radius: var(--radius-md);
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  text-align: center;
}

.post-cta h3 {
  margin-bottom: 10px;
}

.post-cta p {
  color: var(--color-text-muted);
  margin-bottom: 20px;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 24px;
  font-size: 0.92rem;
}

/* ---------- Responsive breakpoints ---------- */
@media (min-width: 640px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .stats-strip .container {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 768px) {
  .hero .container {
    grid-template-columns: 1.05fr 0.95fr;
  }

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

  .contact-grid {
    grid-template-columns: 0.9fr 1.1fr;
  }
}

@media (min-width: 900px) {
  .nav-links {
    display: flex;
  }

  .nav-toggle {
    display: none;
  }
}

@media (max-width: 899px) {
  .nav-links {
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 24px 20px;
    box-shadow: var(--shadow-md);
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.2s ease, opacity 0.2s ease;
  }

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

  .nav-links a:not(.btn) {
    padding: 12px 0;
    border-bottom: 1px solid var(--color-border);
  }

  .nav-links .nav-cta {
    margin-top: 14px;
  }

  .nav-toggle {
    display: flex;
  }
}

@media (min-width: 1024px) {
  .services-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .expertise-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .blog-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .blog-index-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 640px) {
  .expertise,
  .cta-band {
    margin-inline: 12px;
    padding: 48px 22px;
  }

  .section {
    padding: 64px 0;
  }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  * {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}