/* Shared styles: reset, body, nav, header, footer */

* { margin: 0; padding: 0; box-sizing: border-box; }
html { overflow-y: scroll; }

body {
  font-family: 'DM Sans', sans-serif;
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main { flex: 1; width: 100%; }

/* Nav */
nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  margin: 0 auto;
  padding: 24px 24px 0;
}

.logo {
  font-weight: 700;
  font-size: 18px;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.logo span {
  color: var(--text-tertiary);
  font-weight: 400;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 16px;
}

.nav-links a {
  font-size: 14px;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.15s;
}

.nav-links a:hover { color: var(--text-primary); }

.nav-links a.active {
  color: var(--text-primary);
  font-weight: 600;
}

/* Auth buttons */
.sign-in-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 13px;
  font-weight: 500;
  color: var(--text-primary);
  text-decoration: none;
  transition: all 0.15s;
  cursor: pointer;
  font-family: inherit;
}

.sign-in-btn:hover {
  background: var(--surface-hover);
  border-color: var(--text-tertiary);
}

.user-menu {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-secondary);
}

.user-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
}

.sign-out-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 13px;
  font-family: inherit;
  cursor: pointer;
  padding: 0;
}

.sign-out-btn:hover { color: var(--text-primary); }

/* Language dropdown (header) */
.lang-dropdown {
  position: relative;
}
.lang-dropdown summary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8.5px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  list-style: none;
  font-size: 13px;
  line-height: 1;
  color: var(--text-primary);
  background: var(--surface);
  user-select: none;
}
.lang-dropdown summary::-webkit-details-marker { display: none; }
.lang-dropdown summary::marker { content: ""; }
.lang-dropdown summary:hover {
  background: var(--surface-hover);
  border-color: var(--text-tertiary);
}
.lang-dropdown[open] summary { border-color: var(--text-tertiary); }
.lang-dropdown[open] .lang-chevron { transform: rotate(180deg); }
.lang-chevron {
  transition: transform 0.15s;
  color: var(--text-tertiary);
}
.lang-flag {
  font-size: 16px;
  line-height: 1;
  font-family: "Apple Color Emoji", "Segoe UI Emoji", "Noto Color Emoji", sans-serif;
}
.lang-code {
  font-weight: 600;
  letter-spacing: 0.02em;
  font-size: 12px;
}
.lang-menu {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  min-width: 200px;
  max-height: 360px;
  overflow-y: auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 4px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
  z-index: 50;
}
.lang-menu form { display: block; margin: 0; }
.lang-option {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 8px 10px;
  background: none;
  border: none;
  border-radius: 4px;
  font-family: inherit;
  font-size: 13px;
  color: var(--text-primary);
  cursor: pointer;
  text-align: left;
}
.lang-option:hover { background: var(--surface-hover); }
.lang-option-current {
  font-weight: 600;
  background: var(--surface-hover);
  cursor: default;
}

/* Footer */
footer {
  margin-top: auto;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-tertiary);
}

.footer-inner {
  margin: 0 auto;
  padding: 24px;
}

.footer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

footer a {
  color: var(--text-secondary);
  text-decoration: none;
}

footer a:hover { color: var(--text-primary); }

.language-switcher {
  margin-bottom: 16px;
  text-align: center;
  font-size: 12px;
  line-height: 2;
}

.language-switcher .current-lang {
  font-weight: 600;
  color: var(--text-primary);
}

.language-switcher .lang-link {
  color: var(--text-tertiary);
  text-decoration: none;
  transition: color 0.15s;
  background: none;
  border: none;
  font-family: inherit;
  font-size: inherit;
  cursor: pointer;
  padding: 0;
}

.language-switcher .lang-link:hover { color: var(--text-primary); }

.language-switcher .lang-sep {
  color: var(--border);
  margin: 0 4px;
}

/* Flash messages */
.flash-notice {
  max-width: 520px;
  margin: 16px auto;
  padding: 12px 16px;
  background: var(--green-bg);
  color: var(--green);
  border-radius: var(--radius);
  font-size: 14px;
  text-align: center;
}

.flash-alert {
  max-width: 520px;
  margin: 16px auto;
  padding: 12px 16px;
  background: var(--red-bg);
  color: var(--red);
  border-radius: var(--radius);
  font-size: 14px;
  text-align: center;
}

/* Responsive */
@media (max-width: 640px) {
  .footer-top {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }
}

:root {
  --bg: #FAFAF9;
  --surface: #FFFFFF;
  --surface-hover: #F5F5F4;
  --border: #E7E5E4;
  --border-focus: #292524;
  --text-primary: #1C1917;
  --text-secondary: #78716C;
  --text-tertiary: #A8A29E;
  --accent: #1C1917;
  --accent-hover: #292524;
  --accent-text: #FFFFFF;
  --green: #16A34A;
  --green-bg: #F0FDF4;
  --red: #DC2626;
  --red-bg: #FEF2F2;
  --tag-bg: #F5F5F4;
  --tag-text: #78716C;
  --tag-active-bg: #1C1917;
  --tag-active-text: #FFFFFF;
  --code-bg: #F5F5F4;
  --border-light: #F0EEEC;
  --link-color: #1C1917;
  --radius: 10px;
  --radius-lg: 14px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.06);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.08);
}

nav, .footer-inner { max-width: 800px; }

[dir="rtl"] { text-align: right; }
[dir="rtl"] nav { flex-direction: row-reverse; }
[dir="rtl"] .footer-top { flex-direction: row-reverse; }