/*
  Tile Fitting Puzzle support site — self-contained stylesheet.
  Separate from other apps on this hosting; no shared dependencies.
*/

:root {
  --color-bg: #F5F4F2;
  --color-surface: #FFFFFF;
  --color-text: #1E1E2A;
  --color-text-secondary: #5A5A72;
  --color-accent: #5464A0;
  --color-border: #E2E0DC;

  --content-width: 760px;
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2.5rem;
  --space-5: 4rem;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans",
    "Hiragino Kaku Gothic ProN", "Noto Sans JP", Roboto, "Helvetica Neue",
    Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-color: rgba(84, 100, 160, 0.35);
  text-underline-offset: 2px;
}
a:hover, a:focus { text-decoration-color: var(--color-accent); }
a:focus-visible, button:focus-visible, summary:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

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

.shell {
  width: 100%;
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 var(--space-3);
}

/* ---- Header ---- */

.site-header {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding-top: var(--space-2);
  padding-bottom: var(--space-2);
  flex-wrap: wrap;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  text-decoration: none;
  color: var(--color-text);
  font-weight: 600;
}

.logo-area img {
  width: 28px;
  height: 28px;
  border-radius: 6px;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  font-size: 0.9rem;
}

.site-nav a {
  text-decoration: none;
  color: var(--color-text-secondary);
}

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

.lang-switch {
  border-left: 1px solid var(--color-border);
  padding-left: var(--space-2);
}

/* ---- Main / sections ---- */

.page-main { padding: var(--space-5) 0; }

.page-main--narrow .shell { max-width: 680px; }

h1 {
  font-size: 1.9rem;
  line-height: 1.35;
  margin: 0 0 var(--space-1);
}

.page-lead {
  color: var(--color-text-secondary);
  font-size: 1.05rem;
  margin: 0 0 var(--space-4);
}

.page-meta {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  margin: 0 0 var(--space-4);
}

section + section { margin-top: var(--space-5); }

h2 {
  font-size: 1.3rem;
  margin: 0 0 var(--space-3);
  padding-bottom: var(--space-1);
  border-bottom: 1px solid var(--color-border);
}

h3 {
  font-size: 1.05rem;
  margin: var(--space-3) 0 var(--space-1);
}

p { margin: 0 0 var(--space-2); }

ul, ol { margin: 0 0 var(--space-2); padding-left: 1.4em; }

li { margin-bottom: var(--space-1); }
li:last-child { margin-bottom: 0; }

strong { font-weight: 600; }

/* Numbered steps */

.steps {
  list-style: none;
  padding-left: 0;
  margin: 0;
  counter-reset: step;
  border-top: 1px solid var(--color-border);
}

.steps li {
  counter-increment: step;
  position: relative;
  padding: var(--space-3) 0 var(--space-3) 2.6em;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 0;
}

.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: var(--space-3);
  width: 1.7em;
  height: 1.7em;
  border: 1px solid var(--color-accent);
  color: var(--color-accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 600;
}

.steps h3 { margin: 0 0 0.25em; }
.steps p { margin: 0; color: var(--color-text-secondary); }

/* FAQ */

.faq-item { border-bottom: 1px solid var(--color-border); }
.faq-item:first-child { border-top: 1px solid var(--color-border); }

.faq-item summary {
  cursor: pointer;
  padding: var(--space-2) 0;
  font-weight: 600;
  list-style: none;
  display: flex;
  align-items: baseline;
  gap: var(--space-1);
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary::before {
  content: "+";
  color: var(--color-accent);
  font-weight: 400;
  width: 1em;
  flex-shrink: 0;
}

.faq-item[open] summary::before { content: "\2212"; }

.faq-item p {
  margin: 0 0 var(--space-2);
  padding-left: 1em;
  color: var(--color-text-secondary);
}

/* Contact */

.contact-box {
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  border-radius: 4px;
  padding: var(--space-3);
}

.contact-box p:last-child { margin-bottom: 0; }

.contact-email {
  font-size: 1.1rem;
  font-weight: 600;
}

/* Contact form link button */

.contact-form-btn {
  display: inline-block;
  background: var(--color-accent);
  color: #fff;
  text-decoration: none;
  padding: 0.7rem 1.75rem;
  border-radius: 4px;
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: var(--space-3);
}

.contact-form-btn:hover {
  opacity: 0.85;
  text-decoration: none;
}

/* Privacy / legal pages */

.legal-page section { margin-top: var(--space-4); }
.legal-page h2 { font-size: 1.1rem; }

/* Footer */

.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-3) 0;
  color: var(--color-text-secondary);
  font-size: 0.875rem;
}

.site-footer .shell {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-3);
  justify-content: space-between;
}

.site-footer a { color: var(--color-text-secondary); }
.site-footer a:hover, .site-footer a:focus { color: var(--color-accent); }

@media (max-width: 600px) {
  .site-header__inner {
    flex-direction: column;
    align-items: flex-start;
  }

  h1 { font-size: 1.55rem; }

  .site-footer .shell { flex-direction: column; }
}