/*
  Posture Monitoring App support site — self-contained stylesheet.
  Deliberately separate from ../../css/style.css (LingoGrid's site):
  this app's pages must not depend on, or risk affecting, that one.

  Design: the app's own color palette, applied with plain typographic
  hierarchy (headings, whitespace, 1px borders) — no gradients, no
  emoji, no glassmorphism, no heavy shadows or oversized radii.
*/

:root {
  --color-bg: #F6F5F1;
  --color-surface: #FFFFFF;
  --color-text: #20241F;
  --color-text-secondary: #5C6359;
  --color-accent: #2F6B5E;
  --color-border: #E3E0D8;

  --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(47, 107, 94, 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 var(--space-5);
}

.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 ("basic usage") */

.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);
}

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

/* Placement figures */

.figure-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin: var(--space-3) 0;
}

.figure-row figure {
  flex: 1 1 220px;
  margin: 0;
}

.figure-row img {
  border: 1px solid var(--color-border);
  border-radius: 4px;
}

figcaption {
  margin-top: var(--space-1);
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

/* Plan comparison */

.plan-table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-2) 0 var(--space-3);
  font-size: 0.95rem;
}

.plan-table caption {
  text-align: left;
  color: var(--color-text-secondary);
  font-size: 0.85rem;
  margin-bottom: var(--space-1);
}

.plan-table th,
.plan-table td {
  text-align: left;
  padding: var(--space-2) var(--space-2) var(--space-2) 0;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}

.plan-table th {
  color: var(--color-text-secondary);
  font-weight: 600;
  width: 38%;
}

/* 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;
}

/* 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;
  }
}