@layer reset, tokens, base, layout, components, responsive, accessibility;

/* Reset */
@layer reset {
  :where(*, *::before, *::after) {
    box-sizing: border-box;
  }

  :where(html) {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
  }

  :where(body) {
    margin: 0;
    min-block-size: 100dvh;
  }

  :where(img, svg, video, canvas, audio, iframe, embed, object) {
    display: block;
    max-inline-size: 100%;
  }

  :where(p, h1, h2, h3, h4, h5, h6) {
    overflow-wrap: break-word;
  }

  :where(h1, h2, h3, h4, h5, h6) {
    text-wrap: balance;
  }

  :where(address) {
    font-style: normal;
  }

  :where(a) {
    text-underline-offset: 0.25em;
    text-decoration-skip-ink: auto;
  }

  :where(ul, ol)[class] {
    list-style: none;
    padding: 0;
    margin: 0;
  }
}

/* Colors */
@layer colors {
  :root {
    /* Main palette */
    --color-primary-1: #0e4690;
    --color-primary-2: #007498;
    --color-primary-3: #00bca1;
    --color-primary-4: #acfa70;

    /* Light mode */
    --color-bg:        #f7f8f6;
    --color-surface:   #ffffff;
    --color-surface-2: #eef1ef;
    --color-text:      #1c2333;
    --color-text-muted:#5b6472;
    --color-border:    #0e46901f;
    --color-grid-line: #0e46900f;
    --color-accent:    #10407f;
    --color-on-accent: #ffffff;

    --icon-sun-display:  block;
    --icon-moon-display: none;

    --font-display: "Space Grotesk", "Segoe UI", sans-serif;
    --font-body:    "Inter", "Segoe UI", sans-serif;
    --font-mono:    "JetBrains Mono", "SFMono-Regular", Menlo, monospace;

    color-scheme: light;
  }

  /* Dark mode */
  @media (prefers-color-scheme: dark) {
    :root {
      --color-bg:        #10161f;
      --color-surface:   #1a2330;
      --color-surface-2: #222c3a;
      --color-text:      #e7ebee;
      --color-text-muted:#98a4b0;
      --color-border:    #ffffff14;
      --color-grid-line: #ffffff0d;
      --color-accent:    #1b73e6;
      --color-on-accent: #0c1118;

      --icon-sun-display:  none;
      --icon-moon-display: block;

      color-scheme: dark;
    }
  }
  :root[data-theme="dark"] {
    --color-bg:        #10161f;
    --color-surface:   #1a2330;
    --color-surface-2: #222c3a;
    --color-text:      #e7ebee;
    --color-text-muted:#98a4b0;
    --color-border:    #ffffff14;
    --color-grid-line: #ffffff0d;
    --color-accent:    #1b73e6;
    --color-on-accent: #0c1118;

    --icon-sun-display:  none;
    --icon-moon-display: block;

    color-scheme: dark;    
  }

  :root[data-theme="light"] {
    --color-bg:        #f7f8f6;
    --color-surface:   #ffffff;
    --color-surface-2: #eef1ef;
    --color-text:      #1c2333;
    --color-text-muted:#5b6472;
    --color-border:    #0e46901f;
    --color-grid-line: #0e46900f;
    --color-accent:    #10407f;
    --color-on-accent: #ffffff;

    --icon-sun-display:  block;
    --icon-moon-display: none;

    --font-display: "Space Grotesk", "Segoe UI", sans-serif;
    --font-body:    "Inter", "Segoe UI", sans-serif;
    --font-mono:    "JetBrains Mono", "SFMono-Regular", Menlo, monospace;

    color-scheme: light;    
  }
}

/* Base */
@layer base {
  body {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.65;
    color: var(--color-text);
    background-color: var(--color-bg);

    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color 0.5s ease, color 0.5s ease;    
  }

  :where(header, .service-card, .stat, .contact-form, input, textarea) {
    transition: background-color 0.5s ease, border-color 0.5s ease, color 0.5s ease;
  }
}

/* Layout */
@layer layout {
  .container {
    max-inline-size: 1180px;
    margin-inline: auto;
    padding-inline: 1.5rem;
  }

  :where(section[id]) {
    scroll-margin-block-start: 84px;
  }
}

/* Components */
@layer components {
  /* Icons */
  .icon {
    inline-size: 20px;
    block-size: 20px;
    flex-shrink: 0;
    fill: none;
    stroke: currentColor;
    stroke-width: 1.8;
    stroke-linecap: round;
    stroke-linejoin: round;
  }

  .icon-marker {
    color: var(--color-primary-4);
  }

  .icon-sun  { display: var(--icon-sun-display);  }
  .icon-moon { display: var(--icon-moon-display); }

  /* Eyebrow label */
  .eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-block: 0 1rem;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--color-accent);
  }

/* Buttons */
  .button {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding-block: 0.85rem;
    padding-inline: 1.85rem;
    border: 1px solid transparent;
    border-radius: 999px;
    font-family: var(--font-body);
    font-weight: 600;
    font-size: 1rem;
    text-decoration: none;
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.5s ease;
  }

  .button-primary {
    background-color: var(--color-accent);
    color: var(--color-on-accent);
    box-shadow: 0 10px 24px -14px var(--color-accent);
  }

  @media (hover: hover) {
    .button-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 14px 28px -14px var(--color-accent);
    }
  }

  .required-mark {
    color: var(--color-accent);
    margin-inline-start: 0.2em;
  }

  /* Skip link */
  .skip-link {
    position: absolute;
    inset-inline-start: -999px;
    inline-size: 1px;
    block-size: 1px;
    overflow: hidden;
    text-decoration: none;
  }

  .skip-link:focus {
    inset-inline-start: 1rem;
    inset-block-start: 1rem;
    inline-size: auto;
    block-size: auto;
    padding: 0.6rem 1.1rem;
    background-color: var(--color-surface);
    color: var(--color-text);
    border-radius: 8px;
    z-index: 300;
    box-shadow: 0 0 0 3px var(--color-accent);
  }

  /* Header */
  .site-header {
    position: sticky;
    inset-block-start: 0;
    z-index: 100;
    background-color: var(--color-surface);
    border-block-end: 1px solid var(--color-border);
  }

  .header-inner {
    max-inline-size: 1180px;
    margin-inline: auto;
    padding-block: 0.9rem;
    padding-inline: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
  }

  /* Logo */
  .logo {
    display: inline-flex;
    align-items: center;
    gap: 1rem;
    margin: 0;
    padding: 0;
    border: none;
    background: transparent;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 2rem;
    letter-spacing: 0.1em;
    text-decoration: none;
    position: relative;
  }

  .logo-text {
    position: relative;
    display: inline-block;
    white-space: nowrap;
    padding-left: 1rem;
  }

  .logo-text-base,
  .logo-text-hover {
    display: inline-block;
    white-space: nowrap;
    transition: color 0.25s ease;
  }

  .logo-text-base {
    color: transparent;
    -webkit-text-stroke: 1px var(--color-text);
  }

  .logo-text-hover {
    position: absolute;
    inset: 0;
    width: 0;
    overflow: hidden;
    color: var(--color-text);
    -webkit-text-stroke: 1px var(--color-text);
    border-inline-end: 4px solid var(--color-text);
    transition: width 0.45s ease, filter 0.25s ease, padding 0.3s ease;
  }

  .logo:hover .logo-text-hover,
  .logo:focus-visible .logo-text-hover {
    width: 100%;
    padding-left: 1rem;
    filter: drop-shadow(0 0 12px color-mix(in srgb, var(--color-text) 24%, transparent));
    transition: all 0.3s ease;
  }

  .logo:hover,
  .logo:focus-visible {
    color: var(--color-text);
  }

  /* Desktop navigation */
  .main-nav {
    display: flex;
    align-items: center;
    gap: 1.75rem;
  }

  .nav-link {
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--color-text-muted);
    text-decoration: none;
    letter-spacing: 0.01em;
    transition: color 0.2s ease;
  }

  .nav-link:is(:hover, :focus-visible) {
    color: var(--color-accent);
  }

  /* Theme toggle button */
  .theme-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    inline-size: 38px;
    block-size: 38px;
    border-radius: 50%;
    border: 1px solid var(--color-border);
    background-color: var(--color-surface-2);
    color: var(--color-text);
    cursor: pointer;
    transition: background-color 0.5s ease, color 0.5s ease;
  }

  @media (hover: hover) {
    .theme-toggle:hover {
      background-color: var(--color-accent);
      color: var(--color-on-accent);
    }
  }

  /* Hamburger button */
  .hamburger {
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    inline-size: 42px;
    block-size: 42px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    background-color: var(--color-surface-2);
    cursor: pointer;
  }

  .hamburger span {
    display: block;
    inline-size: 18px;
    block-size: 2px;
    background-color: var(--color-text);
    border-radius: 1px;
    transition: transform 0.5s ease, opacity 0.5s ease;
  }

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

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

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

  /* Mobile navigation */
  .mobile-nav {
    display: none;
    flex-direction: column;
    gap: 0.25rem;
    padding-block: 0.5rem 1.25rem;
    padding-inline: 1.5rem;
    border-block-start: 1px solid var(--color-border);
    background-color: var(--color-surface);
  }

  .mobile-nav[aria-hidden="false"] {
    display: flex;
  }

  .mobile-nav .nav-link {
    padding-block: 0.85rem;
    padding-inline: 0.25rem;
    border-block-end: 1px solid var(--color-border);
  }

  .mobile-nav .theme-toggle {
    align-self: flex-start;
    margin-block-start: 0.75rem;
  }

  /* About us section */
  .about {
    padding-block: 4.5rem;
    background-color: var(--color-bg);
    background-image:
      linear-gradient(var(--color-grid-line) 1px, transparent 1px),
      linear-gradient(90deg, var(--color-grid-line) 1px, transparent 1px);
    background-size: 48px 48px;
    position: relative;
    overflow: hidden;
  }

  .decor {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 0;
  }

  .decor img {
    position: absolute;
    opacity: 0.4;
    transform-origin: center center;
  }
  
  .decor-left-img {
    width: clamp(600px, 16vw, 800px);
    height: clamp(300px, 16vw, 400px);
    top: 14rem;
    left: 4rem;
    transform: rotate(-3deg);
  }

  .decor-right-img {
    width: clamp(300px, 16vw, 400px);
    height: clamp(600px, 16vw, 800px);
    bottom: 5rem;
    right: 1.5rem;
    transform: rotate(3deg);
  }

  .about-inner {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1.3fr 1fr;
    gap: 3rem;
    align-items: center;
  }

  .about h1 {
    font-family: var(--font-display);
    font-size: clamp(2.1rem, 4.5vw, 3.2rem);
    line-height: 1.15;
    margin-block: 0 1rem;
    color: var(--color-text);
  }

  .about-lead {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    max-inline-size: 36em;
    margin-block: 0 2rem;
  }

  .about-stats {
    display: grid;
    gap: 1rem;
  }

  .stat {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    padding-block: 1.1rem;
    padding-inline: 1.4rem;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 14px;
  }

  .stat strong {
    display: block;
    font-family: var(--font-mono);
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--color-accent);
  }

  .stat span {
    display: block;
    font-size: 0.9rem;
    color: var(--color-text-muted);
  }

  /* Services */
  .services {
    padding-block: 5rem;
    background-color: var(--color-surface);
  }

  .section-head {
    max-inline-size: 42em;
    margin-block-end: 2.5rem;
  }

  .section-head h2 {
    font-family: var(--font-display);
    font-size: clamp(1.8rem, 3.5vw, 2.4rem);
    line-height: 1.2;
    margin: 0;
    color: var(--color-text);
  }

  .service-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }

  .service-card {
    background-color: var(--color-surface-2);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    padding: 1.75rem;

    contain: layout style;
  }

  .service-icon {
    inline-size: 28px;
    block-size: 28px;
    color: var(--color-accent);
    margin-block-end: 1rem;
  }

  .service-card h3 {
    font-family: var(--font-display);
    font-size: 1.2rem;
    margin-block: 0 0.5rem;
    color: var(--color-text);
  }

  .service-card p {
    color: var(--color-text-muted);
    margin-block: 0 0.75rem;
  }

  .service-card ul {
    padding-inline-start: 1.1rem;
    color: var(--color-text-muted);
    display: grid;
    gap: 0.45rem;
  }

  .service-card :is(p, ul):last-child {
    margin-block-end: 0;
  }

  /* Equipment image figure */
  .equipment-figure {
    margin-block: 2.5rem 0;
    display: grid;
    gap: 0.75rem;
  }

  .equipment-figure img {
    inline-size: 100%;
    max-block-size: 420px;
    object-fit: contain;
    border-radius: 16px;
    border: 1px solid var(--color-border);
  }

  .equipment-figure figcaption {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-text-muted);
  }

  /* Contact section */
  .contact {
    padding-block: 5rem;
    background-color: var(--color-bg);
  }

  .contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: start;
  }

  .contact-info h2 {
    font-family: var(--font-display);
    font-size: clamp(1.8rem, 3.5vw, 2.4rem);
    line-height: 1.2;
    margin-block: 0.4rem 1rem;
    color: var(--color-text);
  }

  .contact-info p {
    color: var(--color-text-muted);
    max-inline-size: 32em;
  }

  .contact-list {
    margin-block: 1.5rem 0;
    display: grid;
    gap: 0.9rem;
  }

  .contact-list li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--color-text);
  }

  .contact-list .icon {
    color: var(--color-accent);
    flex-shrink: 0;
  }

  .contact-list a {
    color: inherit;
    text-decoration: none;
  }

  @media (hover: hover) {
    .contact-list a:hover {
      color: var(--color-accent);
    }
  }

  /* Contact form */
  .contact-form {
    display: grid;
    gap: 1.1rem;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    padding: 2rem;
  }

  .form-field {
    display: grid;
    gap: 0.4rem;
  }

  .form-field label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text);
  }

  .form-field :is(input, textarea) {
    font-family: var(--font-body);
    font-size: 1rem;
    padding-block: 0.7rem;
    padding-inline: 0.9rem;
    border-radius: 10px;
    border: 1px solid var(--color-border);
    background-color: var(--color-bg);
    color: var(--color-text);
    resize: vertical;
    transition: border-color 0.5s ease, box-shadow 0.5s ease;
  }

  .form-field :is(input, textarea)::placeholder {
    color: var(--color-text-muted);
    opacity: 0.7;
  }

  .form-field :is(input, textarea):focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-accent) 25%, transparent);
  }

  .contact-form .button {
    justify-self: start;
  }

  /* Footer */
  .site-footer {
    background-color: var(--color-primary-1);
    color: #ffffff;
    padding-block: 2.5rem;
  }

  .footer-inner {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
  }

  .footer-logo {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    margin: 0;
  }

  :where(.site-footer address, .footer-copy) {
    font-size: 0.9rem;
    opacity: 0.85;
    margin: 0;
  }

  /* Back-to-top button */
  .back-to-top {
    position: fixed;
    inset-inline-end: 1.5rem;
    inset-block-end: 1.5rem;
    inline-size: 46px;
    block-size: 46px;
    border: 1px solid var(--color-accent);
    border-radius: 999px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-surface);
    color: var(--color-accent);
    text-decoration: none;
    box-shadow: 0 0 0 4px color-mix(in srgb, var(--color-accent) 18%, transparent);
    z-index: 90;

    opacity: 0;
    pointer-events: none;
    transform: translateY(8px);
    transition:
      opacity 0.25s ease,
      transform 0.25s ease,
      width 0.25s ease,
      border-radius 0.25s ease,
      background-color 0.25s ease,
      color 0.25s ease,
      box-shadow 0.25s ease;
  }

  .back-to-top .icon {
    transition: opacity 0.25s ease, transform 0.25s ease;
  }

  .back-to-top.is-visible {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .back-to-top::before {
    content: "";
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    font-family: var(--font-body);
    font-size: 0;
    font-weight: 600;
    color: var(--color-on-accent);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease, font-size 0.25s ease;
  }

  @media (hover: hover) {
    .back-to-top.is-visible:hover,
    .back-to-top.is-visible:focus-visible {
      inline-size: 140px;
      border-radius: 999px;
      background-color: var(--color-accent);
      color: var(--color-on-accent);
      box-shadow: 0 0 0 4px color-mix(in srgb, var(--color-accent) 24%, transparent);
    }

    .back-to-top.is-visible:hover .icon,
    .back-to-top.is-visible:focus-visible .icon {
      opacity: 0;
      transform: translateY(-200%);
    }

    .back-to-top.is-visible:hover::before,
    .back-to-top.is-visible:focus-visible::before {
      content: "Späť hore";
      font-size: 0.95rem;
      opacity: 1;
    }
  }
}

/* Responsive */
@layer responsive {
  @media (max-width: 860px) {
    .main-nav {
      display: none;
    }

    .hamburger {
      display: flex;
    }

    .about-inner,
    .contact-grid {
      grid-template-columns: 1fr;
    }

    .about {
      padding-block: 3rem;
    }

    .about-stats {
      grid-template-columns: repeat(3, 1fr);
      gap: 0.75rem;
    }

    .stat {
      flex-direction: column;
      align-items: flex-start;
      gap: 0.4rem;
      padding: 1rem;
    }

    .stat strong {
      font-size: 1.3rem;
    }

    :where(.services, .contact) {
      padding-block: 3rem;
    }

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

    :where(section[id]) {
      scroll-margin-block-start: 64px;
    }

    .decor-left-img {
      width: clamp(300px, 16vw, 400px);
      height: clamp(150px, 16vw, 200px);
    }

    .decor-right-img {
      width: clamp(150px, 16vw, 200px);
      height: clamp(300px, 16vw, 400px);
    }
  }

  @media (min-width: 861px) {
    .mobile-nav {
      display: none;
    }
  }

  @media (max-width: 480px) {
    .about-stats {
      grid-template-columns: 1fr;
    }

    .back-to-top {
      inline-size: 42px;
      block-size: 42px;
      inset-inline-end: 1rem;
      inset-block-end: 1rem;
    }
  }  
}

/* Accessibility */
@layer accessibility {
  :where(a, button, input, textarea):focus-visible {
    outline: 3px solid var(--color-accent);
    outline-offset: 2px;
    border-radius: 6px;
  }

  :where(a, button, input, textarea):focus:not(:focus-visible) {
    outline: none;
  }

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

    :where(*) {
      transition-duration: 0.001ms !important;
      animation-duration: 0.001ms !important;
      animation-iteration-count: 1 !important;
    }
  }  
}