/* ModernizePHP — styles
   Mobile-first. Design tokens as custom properties. No framework. */

:root {
  /* Color */
  --color-bg: #f7f7f4;
  --color-surface: #ffffff;
  --color-surface-alt: #efefea;
  --color-ink: #1b1c19;
  --color-ink-soft: #4f514b;
  --color-ink-muted: #7a7c75;
  --color-line: #dcddd6;
  --color-accent: #2d6a4f;
  --color-accent-strong: #22543e;
  --color-accent-soft: #e4efe9;
  --color-dark: #1f2622;
  --color-on-dark: #f3f4f0;
  --color-on-dark-soft: #c2c6bf;

  /* Type */
  --font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", "Helvetica Neue", Helvetica, sans-serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --text-xs: 0.8125rem;
  --text-sm: 0.9375rem;
  --text-md: 1.0625rem;
  --text-lg: 1.25rem;
  --text-xl: clamp(1.5rem, 1.2rem + 1.4vw, 2.125rem);
  --text-2xl: clamp(2rem, 1.4rem + 3vw, 3.5rem);
  --leading-tight: 1.15;
  --leading-body: 1.6;

  /* Space */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
  --space-9: 6rem;

  /* Shape */
  --radius-sm: 4px;
  --radius-md: 8px;
  --container: 72rem;
  --header-height: 4rem;
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: calc(var(--header-height) + var(--space-4)); }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--text-md);
  line-height: var(--leading-body);
  color: var(--color-ink);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, p, dl, dd, ul { margin: 0; }
ul { padding: 0; list-style: none; }
a { color: var(--color-accent); text-decoration-thickness: 1px; text-underline-offset: 0.15em; }
a:hover { color: var(--color-accent-strong); }
img { max-width: 100%; display: block; }
button { font: inherit; color: inherit; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

/* Layout */
.container { width: min(100% - 2.5rem, var(--container)); margin-inline: auto; }
.section { padding-block: var(--space-8); }
.section--alt { background: var(--color-surface-alt); }
.section__grid { display: grid; gap: var(--space-6); }
.section__header { max-width: 36rem; }
.section__header--wide { max-width: 44rem; margin-bottom: var(--space-6); }
.section__header h2 { margin-top: var(--space-3); }
.section__intro { margin-top: var(--space-4); color: var(--color-ink-soft); }

/* Type */
h1, h2, h3 { font-weight: 600; letter-spacing: -0.015em; line-height: var(--leading-tight); text-wrap: pretty; }
h2 { font-size: var(--text-xl); }
h3 { font-size: var(--text-lg); }
p { text-wrap: pretty; }
.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-accent);
}
.eyebrow--light { color: var(--color-on-dark-soft); }
.prose { max-width: 40rem; display: grid; gap: var(--space-4); color: var(--color-ink-soft); }
.prose p:first-child { color: var(--color-ink); }

/* Skip link */
.skip-link { position: absolute; left: var(--space-4); top: -100%; padding: var(--space-2) var(--space-3); background: var(--color-ink); color: var(--color-on-dark); border-radius: var(--radius-sm); z-index: 100; }
.skip-link:focus { top: var(--space-2); }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--color-bg) 92%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-line);
}
.site-header__inner { display: flex; align-items: center; justify-content: space-between; gap: var(--space-4); min-height: var(--header-height); flex-wrap: wrap; }
.brand { display: inline-flex; align-items: center; gap: var(--space-2); color: var(--color-ink); text-decoration: none; font-weight: 600; letter-spacing: -0.01em; }
.brand__mark { width: 28px; height: 28px; color: var(--color-accent); flex-shrink: 0; }
.brand__accent { color: var(--color-accent); }

.nav-toggle {
  display: inline-flex; align-items: center; gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background: none; border: 1px solid var(--color-line); border-radius: var(--radius-sm); cursor: pointer;
  font-size: var(--text-sm);
}
.nav-toggle__bar { position: relative; width: 16px; height: 2px; background: currentColor; }
.nav-toggle__bar::before, .nav-toggle__bar::after { content: ""; position: absolute; left: 0; width: 100%; height: 2px; background: currentColor; }
.nav-toggle__bar::before { top: -5px; }
.nav-toggle__bar::after { top: 5px; }

.site-nav { display: none; flex-basis: 100%; padding-bottom: var(--space-4); }
.site-nav.is-open { display: block; }
.site-nav__list { display: flex; flex-direction: column; gap: var(--space-1); }
.site-nav__list a { display: block; padding: var(--space-2) 0; color: var(--color-ink-soft); text-decoration: none; font-size: var(--text-sm); }
.site-nav__list a:hover, .site-nav__list a.is-active { color: var(--color-ink); }
.site-nav__cta { color: var(--color-accent) !important; font-weight: 600; }

@media (min-width: 48rem) {
  .nav-toggle { display: none; }
  .site-nav { display: block; flex-basis: auto; padding: 0; }
  .site-nav__list { flex-direction: row; gap: var(--space-5); align-items: center; }
  .site-nav__cta { padding: var(--space-2) var(--space-3) !important; border: 1px solid var(--color-accent); border-radius: var(--radius-sm); }
  .site-nav__cta:hover { background: var(--color-accent-soft); }
}

/* Buttons */
.button {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 2.75rem; padding: 0 var(--space-5);
  border-radius: var(--radius-sm); border: 1px solid transparent;
  font-weight: 600; font-size: var(--text-sm); text-decoration: none; white-space: nowrap;
  transition: background-color 120ms ease, border-color 120ms ease, color 120ms ease;
}
.button--primary { background: var(--color-accent); color: #fff; }
.button--primary:hover { background: var(--color-accent-strong); color: #fff; }
.button--ghost { border-color: var(--color-line); color: var(--color-ink); background: var(--color-surface); }
.button--ghost:hover { border-color: var(--color-ink-muted); color: var(--color-ink); }
.button--light { background: var(--color-on-dark); color: var(--color-dark); }
.button--light:hover { background: #fff; color: var(--color-dark); }
.button:focus-visible, a:focus-visible, button:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }

/* Hero */
.hero { padding-block: var(--space-8) var(--space-7); border-bottom: 1px solid var(--color-line); }
.hero__title { font-size: var(--text-2xl); max-width: 20ch; margin-top: var(--space-4); }
.hero__lead { max-width: 36rem; margin-top: var(--space-5); font-size: var(--text-lg); color: var(--color-ink-soft); }
.hero__actions { display: flex; flex-wrap: wrap; gap: var(--space-3); margin-top: var(--space-6); }
.facts {
  display: grid; gap: var(--space-4);
  margin-top: var(--space-7); padding-top: var(--space-5);
  border-top: 1px solid var(--color-line);
}
.facts dt, .about__facts dt { font-family: var(--font-mono); font-size: var(--text-xs); text-transform: uppercase; letter-spacing: 0.04em; color: var(--color-ink-muted); margin-bottom: var(--space-1); }
.facts dd { font-size: var(--text-sm); color: var(--color-ink); }

/* Problems */
.problem-list { display: grid; gap: 0; border-top: 1px solid var(--color-line); counter-reset: problem; }
.problem-list li {
  position: relative; padding: var(--space-4) 0 var(--space-4) 2.75rem;
  border-bottom: 1px solid var(--color-line); color: var(--color-ink-soft);
}
.problem-list li::before {
  counter-increment: problem; content: counter(problem, decimal-leading-zero);
  position: absolute; left: 0; top: calc(var(--space-4) + 0.3em);
  font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-accent);
}

/* Services */
.service-grid { display: grid; gap: var(--space-4); }
.service { padding: var(--space-5); background: var(--color-surface); border: 1px solid var(--color-line); border-radius: var(--radius-md); }
.service p { margin-top: var(--space-3); font-size: var(--text-sm); color: var(--color-ink-soft); }

/* AI */
.section--compact { padding-block: var(--space-7); border-top: 1px solid var(--color-line); }
.prose--stacked { margin-top: var(--space-4); }
.split { display: grid; gap: var(--space-5); margin-top: var(--space-6); max-width: 44rem; }
.split__col h3 { font-size: var(--text-md); padding-bottom: var(--space-3); border-bottom: 1px solid var(--color-line); }
.check-list { display: grid; gap: var(--space-2); margin-top: var(--space-3); font-size: var(--text-sm); color: var(--color-ink-soft); }
.check-list li { position: relative; padding-left: var(--space-4); }
.check-list li::before { content: ""; position: absolute; left: 0; top: 0.65em; width: 6px; height: 6px; border-radius: 50%; background: var(--color-accent); }
.section__footnote { margin-top: var(--space-6); max-width: 44rem; font-size: var(--text-sm); color: var(--color-ink-muted); }

/* About */
.about { display: grid; gap: var(--space-6); }
.about__aside { display: grid; gap: var(--space-4); align-content: start; }
.about__photo { width: 11rem; height: auto; aspect-ratio: 1; object-fit: cover; border-radius: var(--radius-md); }
.about__facts { display: grid; gap: var(--space-4); align-content: start; padding: var(--space-5); background: var(--color-surface); border: 1px solid var(--color-line); border-radius: var(--radius-md); font-size: var(--text-sm); }

/* Contact */
.contact { background: var(--color-dark); color: var(--color-on-dark); }
.contact h2 { margin-top: var(--space-3); color: #fff; }
.contact__inner { display: grid; gap: var(--space-6); }
.contact__lead { margin-top: var(--space-4); max-width: 34rem; color: var(--color-on-dark-soft); }
.contact__actions { display: grid; gap: var(--space-3); justify-items: start; align-content: end; }
.contact__note { font-size: var(--text-sm); color: var(--color-on-dark-soft); }

/* Contact form */
.contact-form { display: grid; gap: var(--space-4); }
.contact-form__row { display: grid; gap: var(--space-4); }
.field { display: grid; gap: var(--space-1); }
.field label { font-size: var(--text-sm); color: var(--color-on-dark-soft); }
.field__optional { font-family: var(--font-mono); font-size: var(--text-xs); color: #8e968f; margin-left: var(--space-1); }
.field input, .field textarea {
  width: 100%; padding: var(--space-3); font: inherit; font-size: var(--text-sm); line-height: 1.4;
  color: var(--color-on-dark); background: #2a322d; border: 1px solid #3c453f; border-radius: var(--radius-sm);
}
.field input::placeholder, .field textarea::placeholder { color: #7e867f; }
.field input:focus, .field textarea:focus { outline: 2px solid var(--color-on-dark); outline-offset: 1px; border-color: transparent; }
.field input[aria-invalid="true"], .field textarea[aria-invalid="true"] { border-color: #d98b7a; }
.field textarea { resize: vertical; min-height: 8rem; }
.field--hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.contact-form__footer { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-4); margin-top: var(--space-2); }
.contact-form__footer .contact__note a { color: var(--color-on-dark); }
.contact-form__status { font-size: var(--text-sm); color: var(--color-on-dark-soft); min-height: 1.5em; }
.contact-form__status:empty { display: none; }
.contact-form__status.is-error { color: #e8a899; }
.contact-form__status.is-success { color: #a8d5bd; }
.contact-form.is-sending { opacity: 0.7; pointer-events: none; }
.contact-form.is-sent .field, .contact-form.is-sent .contact-form__row, .contact-form.is-sent .contact-form__footer { display: none; }
.contact-form.is-sent .contact-form__status { font-size: var(--text-md); color: var(--color-on-dark); }

/* Obfuscated email: without JS, humans read "dimitar [at] kalinov [dot] pro" */
.email__hidden { display: none; }

/* Footer */
.site-footer { padding-block: var(--space-5); font-size: var(--text-xs); color: var(--color-ink-muted); }
.site-footer__inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: var(--space-2); }
.site-footer a { color: inherit; }

/* Breakpoints */
@media (min-width: 40rem) {
  .facts { grid-template-columns: repeat(3, 1fr); gap: var(--space-5); }
  .service-grid { grid-template-columns: repeat(2, 1fr); gap: var(--space-5); }
  .split { grid-template-columns: repeat(2, 1fr); gap: var(--space-7); }
  .contact-form__row { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 64rem) {
  .section { padding-block: var(--space-9); }
  .section--compact { padding-block: var(--space-8); }
  .hero { padding-block: var(--space-9) var(--space-8); }
  .section__grid { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: var(--space-8); align-items: start; }
  .service-grid { grid-template-columns: repeat(3, 1fr); }
  .about { grid-template-columns: minmax(0, 1fr) 20rem; gap: var(--space-7); }
  .about__photo { width: 100%; max-width: 20rem; }
  .contact__inner { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: var(--space-8); }
}