/* Deep-Agent.AI — mobile-first, no framework. Colors meet WCAG AA on their backgrounds. */

/* ---------- Base layer ---------- */

:root {
  --color-text: #0f172a;        /* slate-900 on white: 17.9:1 */
  --color-muted: #475569;       /* slate-600 on white: 7.6:1 */
  --color-bg: #ffffff;
  --color-surface: #f1f5f9;     /* slate-100 */
  --color-border: #cbd5e1;      /* slate-300 */
  --color-accent: #1d4ed8;      /* blue-700 on white: 6.7:1 */
  --color-accent-dark: #1e3a8a; /* blue-900 */
  --color-on-accent: #ffffff;
  --color-error: #b91c1c;       /* red-700 on white: 6.5:1 */
  --color-success: #15803d;     /* green-700 on white: 5.0:1 */
  --color-focus: #f59e0b;

  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial,
    "Noto Sans", sans-serif;
  --step-0: clamp(1rem, 0.96rem + 0.2vw, 1.125rem);
  --step-1: clamp(1.2rem, 1.1rem + 0.5vw, 1.45rem);
  --step-2: clamp(1.45rem, 1.25rem + 1vw, 1.9rem);
  --step-3: clamp(1.75rem, 1.4rem + 1.8vw, 2.75rem);

  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2.5rem;
  --space-5: 4rem;
  --radius: 0.5rem;
  --container: 72rem;
}

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

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--step-0);
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  overflow-wrap: break-word;
}

img,
svg {
  max-width: 100%;
  height: auto;
}

h1,
h2,
h3 {
  line-height: 1.2;
  margin: 0 0 var(--space-2);
}

h1 { font-size: var(--step-3); }
h2 { font-size: var(--step-2); }
h3 { font-size: var(--step-1); }

p {
  margin: 0 0 var(--space-2);
}

a {
  color: var(--color-accent);
  text-underline-offset: 0.15em;
}

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

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

main:focus {
  outline: none;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-2);
}

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

.skip-link {
  position: absolute;
  left: var(--space-2);
  top: -100px;
  z-index: 100;
  padding: var(--space-1) var(--space-2);
  background: var(--color-text);
  color: var(--color-bg);
  border-radius: var(--radius);
}

.skip-link:focus {
  top: var(--space-1);
  color: var(--color-bg);
}

/* Buttons */
.button {
  display: inline-block;
  padding: 0.75rem 1.4rem;
  border: 2px solid var(--color-accent);
  border-radius: var(--radius);
  background: var(--color-accent);
  color: var(--color-on-accent);
  font: inherit;
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
}

.button:hover {
  background: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
  color: var(--color-on-accent);
}

.button-small {
  padding: 0.45rem 0.9rem;
  font-size: 0.95rem;
}

/* Header & navigation. Without JS the nav is a visible list; with JS (.js) it collapses
   behind the toggle on narrow screens. */
.site-header {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
}

.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1) var(--space-2);
  padding-block: var(--space-2);
}

.logo {
  font-weight: 800;
  font-size: var(--step-1);
  color: var(--color-text);
  text-decoration: none;
  margin-right: auto;
}

.site-nav {
  flex-basis: 100%;
  order: 3;
}

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.site-nav a {
  display: inline-block;
  padding: 0.25rem 0;
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
}

.site-nav a:hover {
  color: var(--color-accent);
  text-decoration: underline;
}

.site-nav a[aria-current="page"] {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-thickness: 2px;
}

.nav-toggle {
  display: none; /* shown only when JavaScript is available (.js on <html>) */
  font: inherit;
  font-size: 0.95rem;
  padding: 0.4rem 0.8rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
  color: var(--color-text);
  cursor: pointer;
}

.js .nav-toggle {
  display: inline-block;
}

.js .site-nav {
  display: none;
}

.js .site-nav.is-open {
  display: block;
}

@media (min-width: 48rem) {
  .site-nav,
  .js .site-nav {
    display: block;
    flex-basis: auto;
    order: 0;
  }

  .site-nav ul {
    flex-direction: row;
    gap: var(--space-3);
  }

  .nav-toggle,
  .js .nav-toggle {
    display: none;
  }

  .logo {
    margin-right: var(--space-2);
  }

  .header-cta {
    margin-left: auto;
  }
}

/* Footer */
.site-footer {
  margin-top: var(--space-5);
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-muted);
  font-size: 0.95rem;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-4);
  padding-block: var(--space-3);
}

.footer-inner p {
  margin: 0;
}

.site-footer a {
  color: var(--color-accent-dark);
}

/* Prose (Markdown pages) */
.prose {
  max-width: 46rem;
  padding-block: var(--space-4) 0;
}

.prose h2 {
  margin-top: var(--space-4);
}

.prose ul,
.prose ol {
  padding-left: 1.4rem;
  margin: 0 0 var(--space-2);
}

.prose li + li {
  margin-top: 0.35rem;
}

.link-list {
  list-style: none;
  padding: 0;
  display: flex;
  gap: var(--space-3);
}

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

/* ---------- Pages: hero, cards, calls to action (US1) ---------- */

.lede {
  font-size: var(--step-1);
  color: var(--color-muted);
  max-width: 46rem;
}

.hero {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding-block: var(--space-4);
}

.hero h1 {
  max-width: 52rem;
}

.hero .lede {
  margin-bottom: var(--space-2);
}

.hero p:not(.lede):not(.cta) {
  max-width: 46rem;
}

.cta {
  margin: var(--space-3) 0 0;
}

.page-intro {
  padding-block: var(--space-4) var(--space-2);
}

.services {
  padding-block: var(--space-4) 0;
}

.card-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
}

@media (min-width: 48rem) {
  .card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 68.75rem) {
  .card-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.card {
  position: relative;
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
}

.card h2,
.card h3 {
  font-size: var(--step-1);
  margin-bottom: var(--space-1);
}

.card p {
  margin: 0;
  color: var(--color-muted);
}

.card-icon {
  display: block;
  width: 48px;
  height: 48px;
  margin-bottom: var(--space-2);
  color: var(--color-accent);
}

.closing {
  margin-top: var(--space-5);
  padding: var(--space-4) var(--space-2);
  text-align: center;
  border-top: 1px solid var(--color-border);
}

.closing-text {
  font-size: var(--step-1);
  font-weight: 600;
  margin-inline: auto;
  max-width: 40rem;
}

.contact-email {
  font-size: var(--step-1);
}

/* ---------- Contact form (US2) ---------- */

.contact-form {
  max-width: 40rem;
  margin-top: var(--space-2);
}

.field {
  margin-bottom: var(--space-3);
}

.field label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.field-hint {
  margin: 0 0 0.35rem;
  font-size: 0.95rem;
  color: var(--color-muted);
}

.field input,
.field textarea {
  display: block;
  width: 100%;
  padding: 0.65rem 0.75rem;
  font: inherit;
  color: var(--color-text);
  background: var(--color-bg);
  border: 2px solid #64748b; /* slate-500: 4.8:1, meets 3:1 for UI components */
  border-radius: var(--radius);
}

.field textarea {
  resize: vertical;
  min-height: 9rem;
}

.field input[aria-invalid="true"],
.field textarea[aria-invalid="true"] {
  border-color: var(--color-error);
  border-width: 3px;
}

.field-error {
  margin: 0.35rem 0 0;
  color: var(--color-error);
  font-weight: 600;
}

/* Text marker so errors aren't signalled by color alone. */
.field-error::before {
  content: "\26A0\FE0E  ";
}

.button:disabled {
  opacity: 0.7;
  cursor: progress;
}

.form-status:empty {
  display: none;
}

.form-status {
  margin-bottom: var(--space-3);
  padding: var(--space-2);
  border-radius: var(--radius);
  border-left: 6px solid var(--color-border);
  background: var(--color-surface);
  font-weight: 600;
}

.form-status-success {
  border-left-color: var(--color-success);
  color: var(--color-success);
}

.form-status-error {
  border-left-color: var(--color-error);
  color: var(--color-error);
}

/* No-JS status: only the message named in the URL fragment (#status-<code>) is shown. */
.status-noscript p {
  display: none;
}

.status-noscript p:target {
  display: block;
  margin-bottom: var(--space-3);
  padding: var(--space-2);
  border-left: 6px solid var(--color-error);
  background: var(--color-surface);
  color: var(--color-error);
  font-weight: 600;
}

/* Honeypot: off-screen (not display:none, which some bots detect). */
.hp {
  position: absolute;
  left: -10000px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.recaptcha-notice {
  margin-top: var(--space-2);
  font-size: 0.85rem;
  color: var(--color-muted);
}

/* The required notice is shown above, so Google's floating badge may be hidden. */
.grecaptcha-badge {
  visibility: hidden;
}

/* ---------- Service details (US3) ---------- */

/* Whole card is clickable via a stretched link; only the title link is focusable. */
.service-card a {
  color: var(--color-text);
  text-decoration: none;
}

.service-card a::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: var(--radius);
}

.service-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 2px 10px rgb(15 23 42 / 0.08);
}

.service-card:hover a,
.service-card a:focus-visible {
  color: var(--color-accent);
  text-decoration: underline;
}

.service-card:focus-within {
  outline: 3px solid var(--color-focus);
  outline-offset: 2px;
}

.service-card a:focus-visible {
  outline: none;
}

.breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0 0 var(--space-3);
  padding: 0;
  font-size: 0.95rem;
  color: var(--color-muted);
}

.breadcrumb li + li::before {
  content: "/";
  margin-right: 0.5rem;
  color: var(--color-muted);
}

.service-detail .lede {
  margin-bottom: var(--space-3);
}

/* ---------- Services overview: richer entries + lifecycle (FR-003a) ---------- */

.service-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-3);
}

.service-entry {
  display: grid;
  gap: var(--space-2) var(--space-4);
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  scroll-margin-top: var(--space-3);
}

@media (min-width: 56rem) {
  .service-entry {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    align-items: start;
  }
}

.service-entry h2 {
  font-size: var(--step-2);
  margin-bottom: var(--space-1);
}

.service-entry h2 a {
  color: var(--color-text);
  text-decoration: none;
}

.service-entry h2 a:hover {
  color: var(--color-accent);
  text-decoration: underline;
}

.service-summary {
  color: var(--color-muted);
  margin: 0;
}

.service-entry-body {
  padding-top: var(--space-1);
}

@media (min-width: 56rem) {
  .service-entry-body {
    padding: 0 0 0 var(--space-4);
    border-left: 1px solid var(--color-border);
  }
}

.ideal-for {
  margin-bottom: var(--space-2);
}

.deliverables-label {
  font-size: var(--step-0);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-muted);
  margin-bottom: var(--space-1);
}

.deliverables {
  margin: 0 0 var(--space-2);
  padding-left: 1.2rem;
}

.deliverables li + li {
  margin-top: 0.3rem;
}

.learn-more {
  font-weight: 600;
}

.learn-more::after {
  content: " \2192"; /* → */
}

.lifecycle {
  margin-top: var(--space-5);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
}

.lifecycle-steps {
  list-style: none;
  counter-reset: step;
  margin: var(--space-3) 0 0;
  padding: 0;
  display: grid;
  gap: var(--space-3);
}

@media (min-width: 48rem) {
  .lifecycle-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 68.75rem) {
  .lifecycle-steps {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

.lifecycle-steps li {
  counter-increment: step;
  padding: var(--space-2);
  background: var(--color-surface);
  border-radius: var(--radius);
  border-top: 4px solid var(--color-accent);
}

.lifecycle-steps li::before {
  content: counter(step);
  display: inline-grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  margin-bottom: var(--space-1);
  border-radius: 50%;
  background: var(--color-accent);
  color: var(--color-on-accent);
  font-weight: 700;
}

.lifecycle-steps h3 {
  font-size: var(--step-1);
  margin-bottom: 0.4rem;
}

.lifecycle-steps p {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.95rem;
}