@import url(https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700;800;900&display=swap);

@layer base, components, utilities;

:root {
  --bg: #ffffff;
  --fg: #34383f;
  --muted: #555555;
  --border: #e6e6e6;

  --input-border: #d1d5db;

  --step--1: 0.85rem;
  --step-0:  1rem;
  --step-1:  1.3rem;
  --step-2:  1.8rem;
  --step-3:  2.1rem;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 4rem;

  --radius: 8px;
  --container: 85ch;
}

@media (max-width: 480px) {
  :root {
    --container: 45ch;  /* phones */
    --space-5: 2%;
    --space-7: 1rem;
  }
}

@layer base {
  html { font-size: 100%; }  
  
  * { box-sizing: border-box; }
  
  body, h1, h2, h3, h4, h5, h6, p, ul, ol, li {
    margin: 0;
    padding: 0;
    font-weight: 400;
  }

  ul, ol {
    list-style: none;
  }

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

  input, button, textarea, select {
    font: inherit;
  }

  body {
    font-family: "Poppins", Times, serif;
    font-size: var(--step-0);
    font-weight: 400;
    line-height: 1.7;
    color: var(--fg);
    background: var(--bg);
  }

  h1 { font-size: var(--step-3); }
  h2 { font-size: var(--step-2); }
  h3 { font-size: var(--step-1); }
  p, ul, ol, pre, blockquote, figure { margin: 0; }

  a { color: var(--accent); text-decoration: none; }
  a:hover { text-decoration-thickness: 2px; text-decoration: underline;}

  code, pre { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
  pre { padding: var(--space-4); background: color-mix(in oklab, var(--fg) 6%, transparent); border-radius: var(--radius); overflow: auto; }

  hr { border: 0; border-top: 1px solid var(--border); margin: var(--space-6) 0; }

  blockquote {
    margin-inline: 0; padding-inline: var(--space-5);
    border-inline-start: 3px solid var(--border); color: var(--muted);
  }

  :focus-visible { outline: 3px solid color-mix(in oklab, var(--accent) 60%, transparent); outline-offset: 2px; }
}

@layer components {
  .site-header {
    border-bottom: 1px solid var(--border);
    background: var(--bg);
    padding-block: var(--space-4);
  }

  .nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-top: 1px solid var(--fg);
    border-bottom: 1px solid var(--fg);
    margin-top: 3px;
  }

  .nav-logo a {
    text-decoration: none;
    color: var(--muted);
    font-size: var(--step-2);
  }

  .nav-right {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    width: 30%;
    min-width: 10em;
  }

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

  .container { max-width: var(--container); margin-inline: auto; padding-inline: var(--space-5); }

  .hero {
    margin-top: var(--space-7);
    margin-bottom: var(--space-7);
    text-align: center;
  }

  .hero div {
    text-align: left; 
    margin-top: 20px; 
    margin-bottom: 20px;
  }

  .hero ul {
    text-align: left;
    margin-top: 20px; 
    margin-left: 20px;
    margin-bottom: 20px;
    list-style: disc;
  }

  .features {
      display: flex;
      justify-content: space-evenly;
      flex-wrap: wrap;
      gap: var(--space-5);
  }

  .feature {
    flex: 1 1 22rem;
    width: calc(50% - var(--space-5) / 2);
    max-width: 30rem;
    margin: 0px;
  }

  .map {
    margin-top: 6rem;
    margin-bottom: 2rem;
  }

  .map-container {
    width: 100%;
    margin: 0px 0px 10px 0px;
  }

  #map {
    height: 70ch;
  }

  /* -- input form -- */

  .input-form-container {
    background: white;
    width: 100%;
    max-width: var(--container);
    padding: 3%;
    border: 1px solid var(--input-border);
  }

  .input-form-container .notification {
    background: #f9fafb;
    border-radius: 9px;
    padding: 15px;
    margin-bottom: 1rem;
    font-size: 15px;
    border: 1px solid var(--input-border);
    display: none;
    width: 100%;
  }

  .input-form-container .row {
    margin-bottom: 1rem;
    position: relative;
  }

  .input-form-container .row:last-child {
    margin-bottom: 0rem;
  }

  .input-form-container label {
    min-width: 6ch;
    display: inline-block;
  }

  .input-form-container .textbox {
    padding: 2px 6px;
    border-radius: 6px;
    border: 1px solid var(--input-border);
    font-size: 1rem;
    min-width: 23ch;
    width: 65%;
  }

  .input-form-container .button {
    cursor: pointer; 
    background-color: #eee;
    border-radius: 8px; 
    padding: 4px 12px; 
    border: none;
    vertical-align: middle;
  }

  .input-form-container .button:hover {
    background-color: #ccc;
  }

  .input-form-container .icon-arrow img {
      display: inline-block; 
      height: 20px; 
      vertical-align: -.25em;
  }

  .input-form-container .icon-link img {
      display: inline-block; 
      height: 24px; 
      vertical-align: -.4em;
  }

  /* -- input form (end) -- */

  .tooltip {
    visibility: hidden;
    opacity: 0;
    background: #bbb;
    color: #fff;
    padding: 6px 10px;
    border-radius: 4px;
    font-size: 14px;
    line-height: 1;

    position: absolute;
    transform: translateX(-50%);

    transition: opacity 0.2s ease;
    white-space: nowrap;
  }

  .right {
    right: -60px;
    top: 0px;
  }

  .left {
    left: 80px;
    top: 0px;
  }

  .mb10 {
    margin-bottom: 10px;
  } 

  .w100 {
    width: 100%;
  }
  
  .h45 {
    height: 45px;
  }

  .example {
    display: flex;
    justify-content: space-between;
    align-items:center;
    flex-wrap: wrap;
    gap: var(--space-5);
  }

  .footer {
    margin-top: 6rem;
    text-align: center;
  }

  .prose :where(p + p) { margin-top: var(--space-4); }
  .lead { font-size: var(--step-1); color: var(--muted); }
  .btn {
    display: inline-block; padding: .6em .9em; border-radius: var(--radius);
    border: 1px solid var(--border); background: transparent; color: var(--fg);
    text-decoration: none;
  }
  .btn:is(:hover,:focus-visible) { border-color: var(--accent); }
  .card {
    padding: var(--space-5); border: 1px solid var(--border); border-radius: var(--radius);
    background: color-mix(in oklab, var(--bg) 98%, var(--fg));
  }
  .grid { display: grid; gap: var(--space-5); }
  @container (min-width: 48rem) {
    .grid.cols-2 { grid-template-columns: 1fr 1fr; }
    .grid.cols-3 { grid-template-columns: repeat(3,1fr); }
  }
}

@layer utilities {
  .stack > * + * { margin-top: var(--space-5); }
  .center { display: grid; place-items: center; }
  .mt-0 { margin-top: 0; } 
  .mb-0 { margin-bottom: 0; }
  .muted { color: var(--muted); }
  .measure { max-width: 65ch; }
}