/* ═══════════════════════════════════════════════════════════
   Kestrel Stack — style.css
   Geometric, minimal, navy + orange brand
   Mobile-first, no external dependencies
   ═══════════════════════════════════════════════════════════ */

/* ─── Custom properties ─────────────────────────────────── */
:root {
  /* Brand colours */
  --color-primary:    #1A3A5C;
  --color-accent:     #F07820;
  --color-white:      #FFFFFF;
  --color-bg:         #F8F9FA;
  --color-text:       #1A3A5C;
  --color-text-muted: #6B7280;

  /* Derived tones */
  --color-primary-dark:  #102740;
  --color-accent-light:  #FFF3E8;
  --color-border:        #D1D5DB;
  --color-surface:       #FFFFFF;

  /* Spacing scale */
  --space-xs:  0.5rem;
  --space-sm:  1rem;
  --space-md:  1.5rem;
  --space-lg:  2.5rem;
  --space-xl:  4rem;
  --space-2xl: 6rem;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
               'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-lg:   1.125rem;
  --text-xl:   1.25rem;
  --text-2xl:  1.5rem;
  --text-3xl:  2rem;
  --text-4xl:  2.75rem;
  --text-5xl:  3.5rem;

  /* Layout */
  --max-width: 1120px;
  --nav-height: 68px;

  /* Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(26, 58, 92, 0.08), 0 1px 2px rgba(26, 58, 92, 0.06);
  --shadow-md: 0 4px 12px rgba(26, 58, 92, 0.10), 0 2px 4px rgba(26, 58, 92, 0.06);
  --shadow-lg: 0 10px 32px rgba(26, 58, 92, 0.12), 0 4px 8px rgba(26, 58, 92, 0.08);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

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

ul {
  list-style: none;
}

button {
  cursor: pointer;
  font-family: inherit;
}

/* ─── Layout utilities ───────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-md);
}

.section {
  padding-block: var(--space-2xl);
}

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

/* ─── Section typography ─────────────────────────────────── */
.section-label {
  display: inline-block;
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

.section-title {
  font-size: var(--text-3xl);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-primary);
  margin-bottom: var(--space-md);
}

.section-intro {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 640px;
  margin-bottom: var(--space-xl);
}

/* ─── Buttons ─────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.75rem;
  font-size: var(--text-base);
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 2px solid transparent;
  transition: background-color var(--transition-fast),
              color var(--transition-fast),
              border-color var(--transition-fast),
              transform var(--transition-fast),
              box-shadow var(--transition-fast);
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.btn--primary {
  background-color: var(--color-accent);
  color: var(--color-white);
  border-color: var(--color-accent);
}

.btn--primary:hover,
.btn--primary:focus-visible {
  background-color: #d96810;
  border-color: #d96810;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn--primary:active {
  transform: translateY(0);
  box-shadow: none;
}

/* ─── Navigation ─────────────────────────────────────────── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  background-color: var(--color-primary);
  border-bottom: 3px solid var(--color-accent);
  box-shadow: var(--shadow-sm);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-weight: 700;
  font-size: var(--text-lg);
  color: var(--color-white);
  letter-spacing: -0.01em;
  transition: opacity var(--transition-fast);
}

.nav__logo:hover {
  opacity: 0.9;
}

.nav__logo-mark {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav__links a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: rgba(255, 255, 255, 0.82);
  letter-spacing: 0.02em;
  transition: color var(--transition-fast);
  padding-block: 0.25rem;
  border-bottom: 2px solid transparent;
}

.nav__links a:hover,
.nav__links a:focus-visible {
  color: var(--color-white);
  border-bottom-color: var(--color-accent);
}

.nav__cta {
  background-color: var(--color-accent);
  color: var(--color-white) !important;
  padding: 0.5rem 1.125rem;
  border-radius: var(--radius-sm);
  border-bottom: none !important;
  transition: background-color var(--transition-fast) !important;
}

.nav__cta:hover,
.nav__cta:focus-visible {
  background-color: #d96810 !important;
  border-bottom: none !important;
}

/* ─── Hero ────────────────────────────────────────────────── */
.hero {
  position: relative;
  overflow: hidden;
  background-color: var(--color-primary);
  color: var(--color-white);
  padding-block: var(--space-2xl) calc(var(--space-2xl) + var(--space-xl));
  min-height: min(640px, 90vh);
  display: flex;
  align-items: center;
}

.hero__inner {
  position: relative;
  z-index: 1;
}

.hero__eyebrow {
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

.hero__headline {
  font-size: var(--text-4xl);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--color-white);
  margin-bottom: var(--space-md);
  max-width: 680px;
}

.hero__sub {
  font-size: var(--text-lg);
  color: rgba(255, 255, 255, 0.78);
  max-width: 560px;
  line-height: 1.65;
  margin-bottom: var(--space-lg);
}

/* Geometric decorative shapes */
.hero__geometry {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

.geo {
  position: absolute;
  display: block;
  border: 2px solid rgba(240, 120, 32, 0.18);
}

.geo--1 {
  width: 320px;
  height: 320px;
  right: -60px;
  top: -80px;
  transform: rotate(20deg);
  border-radius: var(--radius-sm);
}

.geo--2 {
  width: 200px;
  height: 200px;
  right: 160px;
  bottom: 20px;
  transform: rotate(-12deg);
  border-color: rgba(240, 120, 32, 0.12);
  border-radius: var(--radius-sm);
}

.geo--3 {
  width: 80px;
  height: 80px;
  right: 80px;
  top: 50%;
  transform: translateY(-50%) rotate(45deg);
  background-color: rgba(240, 120, 32, 0.08);
  border-color: rgba(240, 120, 32, 0.20);
}

/* ─── About ───────────────────────────────────────────────── */
.about__inner {
  display: grid;
  gap: var(--space-lg);
}

.about__body {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  max-width: 720px;
}

.about__body p {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  line-height: 1.75;
}

/* ─── Service cards ──────────────────────────────────────── */
.services__grid {
  display: grid;
  gap: var(--space-md);
  grid-template-columns: 1fr;
}

.card {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
  border-top: 3px solid var(--color-accent);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.card__icon {
  width: 48px;
  height: 48px;
  margin-bottom: var(--space-md);
}

.card__icon svg {
  width: 100%;
  height: 100%;
}

.card__title {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
}

.card__body {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-md);
}

.card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.card__tags li {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-accent);
  background-color: var(--color-accent-light);
  padding: 0.2rem 0.65rem;
  border-radius: var(--radius-sm);
  letter-spacing: 0.02em;
}

/* ─── Project cards ──────────────────────────────────────── */
.projects__grid {
  display: grid;
  gap: var(--space-md);
  grid-template-columns: 1fr;
}

.project-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.project-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.project-card__image {
  height: 180px;
  display: flex;
  align-items: flex-end;
  padding: var(--space-md);
  position: relative;
}

.project-card__image--1 {
  background: linear-gradient(135deg, #1A3A5C 0%, #102740 60%, #F07820 100%);
}

.project-card__image--2 {
  background: linear-gradient(135deg, #102740 0%, #1A3A5C 50%, #c05810 100%);
}

.project-card__image--3 {
  background: linear-gradient(135deg, #F07820 0%, #1A3A5C 70%, #102740 100%);
}

.project-card__label {
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-white);
  background-color: rgba(26, 58, 92, 0.6);
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-sm);
  backdrop-filter: blur(4px);
}

.project-card__body {
  padding: var(--space-md);
}

.project-card__title {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
}

.project-card__desc {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.65;
  margin-bottom: var(--space-sm);
}

.project-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.project-card__tags span {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-primary);
  background-color: #E8EEF5;
  padding: 0.2rem 0.65rem;
  border-radius: var(--radius-sm);
}

/* ─── Contact ─────────────────────────────────────────────── */
.contact__inner {
  max-width: 640px;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.form-group label {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-primary);
  letter-spacing: 0.01em;
}

.form-group input,
.form-group textarea {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-white);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  width: 100%;
  transition: border-color var(--transition-fast),
              box-shadow var(--transition-fast);
  outline: none;
  -webkit-appearance: none;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: #9CA3AF;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(240, 120, 32, 0.14);
}

.form-group textarea {
  resize: vertical;
  min-height: 140px;
}

.form-success {
  background-color: #ECFDF5;
  border: 1.5px solid #6EE7B7;
  color: #065F46;
  border-radius: var(--radius-md);
  padding: var(--space-md);
  font-weight: 500;
  margin-bottom: var(--space-md);
}

/* ─── Footer ──────────────────────────────────────────────── */
.footer {
  background-color: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.75);
  padding-block: var(--space-xl);
}

.footer__inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.footer .nav__logo {
  color: var(--color-white);
}

.footer__tagline {
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.55);
  margin-top: var(--space-xs);
}

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

.footer__links a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: rgba(255, 255, 255, 0.65);
  transition: color var(--transition-fast);
}

.footer__links a:hover,
.footer__links a:focus-visible {
  color: var(--color-accent);
}

.footer__copy {
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.40);
  border-top: 1px solid rgba(255, 255, 255, 0.10);
  padding-top: var(--space-md);
}

/* ─── Focus styles ───────────────────────────────────────── */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ─── Responsive: tablet ─────────────────────────────────── */
@media (min-width: 640px) {
  .services__grid {
    grid-template-columns: 1fr 1fr;
  }

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

  .section-title {
    font-size: var(--text-4xl);
  }

  .hero__headline {
    font-size: var(--text-5xl);
  }
}

/* ─── Responsive: desktop ─────────────────────────────────── */
@media (min-width: 1024px) {
  .services__grid {
    grid-template-columns: repeat(4, 1fr);
  }

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

  .footer__inner {
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
    flex-wrap: wrap;
  }

  .footer__copy {
    flex-basis: 100%;
  }

  .geo--1 {
    width: 480px;
    height: 480px;
    right: -80px;
    top: -100px;
  }
}

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