/* ============================================
   Riverside QS Services Limited - Stylesheet
   ============================================ */

/* --- Custom Properties --- */
:root {
  --color-dark: #000000;
  --color-dark-translucent: rgba(0, 0, 0, 0.4);
  --color-panel: #efefef;
  --color-white: #ffffff;
  --color-off-white: #f5f5f5;
  --color-text: #6a6a6a;
  --color-text-light: #aaaaaa;
  --color-heading: #333333;
  --color-link: #979395;
  --color-btn: #d7d7d7;
  --color-btn-hover: #222222;
  --color-border: #bbbbbb;
  --color-focus: #f0c040;
  --font-stack: 'Open Sans', 'Lucida Sans', system-ui, sans-serif;
  --max-width: 1000px;
  --header-height: 80px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-stack);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-dark);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-link);
  text-decoration: underline;
}

a:hover {
  text-decoration: none;
}

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

/* --- Skip Navigation --- */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  background: var(--color-focus);
  color: var(--color-dark);
  padding: 0.5rem 1rem;
  z-index: 1000;
  font-weight: 700;
  border-radius: 0 0 4px 4px;
}

.skip-link:focus {
  top: 0;
}

/* --- Header --- */
.site-header {
  background-color: var(--color-white);
  border-bottom: 3px solid var(--color-dark);
  color: var(--color-text);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-height);
}

.site-logo {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.site-logo img {
  height: 65px;
  width: auto;
  transition: opacity 0.2s;
}

.site-logo:hover img {
  opacity: 0.85;
}

/* --- Navigation --- */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  color: var(--color-heading);
}

.nav-toggle svg {
  width: 28px;
  height: 28px;
  fill: currentColor;
}

.site-nav ul {
  list-style: none;
  display: flex;
  gap: 0.25rem;
}

.site-nav a {
  color: var(--color-text);
  padding: 0.5rem 0.75rem;
  border-radius: 4px;
  display: block;
  text-decoration: none;
  font-size: 1.05rem;
  transition: color 0.2s;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--color-heading);
  text-decoration: none;
}

/* --- Mobile Navigation --- */
@media (max-width: 640px) {
  .nav-toggle {
    display: block;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: var(--color-panel);
    border-top: 1px solid var(--color-border);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
  }

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

  .site-nav ul {
    flex-direction: column;
    padding: 0.5rem 0;
  }

  .site-nav a {
    padding: 0.75rem 1.5rem;
    border-radius: 0;
  }
}

/* --- Main Content --- */
main {
  flex: 1;
  background-color: var(--color-panel);
}

/* --- Hero Section (two-column: text + image) --- */
.hero {
  background-color: var(--color-panel);
  color: var(--color-text);
  padding: 2.5rem 1rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.hero-layout {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.hero-text {
  flex: 1;
}

.hero h1 {
  font-size: 1.75rem;
  font-weight: 400;
  color: var(--color-heading);
  margin-bottom: 1rem;
}

.hero-text p {
  margin-bottom: 1rem;
}

.hero-media {
  flex: 0 0 auto;
  width: 280px;
}

.hero-img {
  width: 100%;
  border: 1px solid var(--color-border);
}

/* --- Content Sections --- */
.section {
  padding: 2.5rem 1rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.section--alt {
  background-color: var(--color-off-white);
  max-width: 100%;
  padding-left: 1rem;
  padding-right: 1rem;
}

.section--alt .section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section h2 {
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--color-heading);
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.5rem;
}

.section p {
  margin-bottom: 1rem;
}

.section ul {
  margin: 1rem 0 1rem 1.5rem;
}

.section li {
  margin-bottom: 0.35rem;
}

/* --- CTA Section --- */
.cta {
  background-color: var(--color-dark);
  color: var(--color-text-light);
  text-align: center;
  padding: 2.5rem 1rem;
}

.cta p {
  max-width: var(--max-width);
  margin: 0 auto 1.25rem;
  font-size: 1.1rem;
}

.cta .btn {
  display: inline-block;
  background-color: var(--color-btn);
  color: var(--color-heading);
  padding: 0.6rem 1.5rem;
  border: 1px solid var(--color-text-light);
  border-radius: 0;
  font-size: 1rem;
  font-weight: 400;
  transition: background-color 0.2s, color 0.2s;
  text-decoration: none;
}

.cta .btn:hover {
  background-color: var(--color-btn-hover);
  color: #ccc;
  text-decoration: none;
}

/* --- Page Header (inner pages - two-column) --- */
.page-header {
  background-color: var(--color-panel);
  color: var(--color-text);
  padding: 2.5rem 1rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.page-header-layout {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.page-header-text {
  flex: 1;
}

.page-header h1 {
  font-size: 1.75rem;
  font-weight: 400;
  color: var(--color-heading);
}

.page-header-text p {
  margin-top: 1rem;
}

.page-header-media {
  flex: 0 0 auto;
  width: 280px;
}

.page-header-img {
  width: 100%;
  border: 1px solid var(--color-border);
}

/* --- Contact Columns --- */
.contact-columns {
  display: flex;
  gap: 3rem;
}

.contact-details {
  flex: 0 0 auto;
  width: 280px;
}

.contact-form-col {
  flex: 1;
}

.contact-form-col h3 {
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--color-heading);
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.5rem;
}

.contact-form-col .form {
  max-width: 100%;
}

/* --- Contact Info --- */
.contact-info {
  margin-bottom: 1.5rem;
}

.contact-info p {
  margin-bottom: 0.35rem;
}

.contact-info a {
  font-weight: 600;
}

/* --- Form --- */
.form {
  max-width: 600px;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.35rem;
  color: var(--color-heading);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.6rem 0.75rem;
  border: 1px solid #999;
  border-radius: 0;
  font-family: var(--font-stack);
  font-size: 1rem;
  color: var(--color-text);
  background-color: var(--color-white);
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--color-heading);
  outline: 2px solid var(--color-heading);
  outline-offset: 1px;
}

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

.form-submit {
  display: inline-block;
  background-color: var(--color-btn);
  color: var(--color-heading);
  padding: 0.6rem 1.5rem;
  border: 1px solid var(--color-text-light);
  border-radius: 0;
  font-family: var(--font-stack);
  font-size: 1rem;
  font-weight: 400;
  cursor: pointer;
  transition: background-color 0.2s, color 0.2s;
}

.form-submit:hover {
  background-color: var(--color-btn-hover);
  color: #ccc;
}

/* --- 404 Page --- */
.error-page {
  text-align: center;
  padding: 4rem 1rem;
}

.error-page h1 {
  font-size: 4rem;
  color: var(--color-heading);
  margin-bottom: 0.5rem;
}

.error-page h2 {
  font-size: 1.5rem;
  color: var(--color-text);
  margin-bottom: 1rem;
  border: none;
  padding: 0;
}

.error-page p {
  margin-bottom: 1.5rem;
  color: var(--color-text);
}

.error-page .btn {
  display: inline-block;
  background-color: var(--color-btn);
  color: var(--color-heading);
  padding: 0.6rem 1.5rem;
  border: 1px solid var(--color-text-light);
  border-radius: 0;
  font-weight: 400;
  text-decoration: none;
  transition: background-color 0.2s, color 0.2s;
}

.error-page .btn:hover {
  background-color: var(--color-btn-hover);
  color: #ccc;
  text-decoration: none;
}

/* --- Footer --- */
.site-footer {
  background-color: var(--color-panel);
  border-top: 3px solid var(--color-dark);
  color: var(--color-text);
  text-align: center;
  padding: 1.5rem 1rem;
  font-size: 0.9rem;
}

/* --- Responsive --- */
@media (min-width: 641px) {
  .hero h1,
  .page-header h1 {
    font-size: 2.25rem;
  }

  .section {
    padding: 3rem 2rem;
  }

  .section--alt {
    padding-left: 2rem;
    padding-right: 2rem;
  }

  .cta {
    padding: 3rem 2rem;
  }

  .hero-media {
    width: 340px;
  }

  .page-header-media {
    width: 340px;
  }
}

/* Stack columns on mobile */
@media (max-width: 640px) {
  .hero-layout,
  .page-header-layout,
  .contact-columns {
    flex-direction: column;
  }

  .hero-media,
  .page-header-media {
    width: 100%;
    max-width: 300px;
  }

  .contact-details {
    width: 100%;
  }
}

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

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