/* =============================================================
   header.css — shared header, footer, and base layout styles
   Loaded by: index.html, post.html
   ============================================================= */

/* ── Light theme overrides ── */
html.theme-light {
  --bg: #f5f6fa;
  --bg-elevated: #ffffff;
  --bg-input: #eef0f6;
  --bg-hover: rgba(0,0,0,0.04);
  --border: rgba(0,0,0,0.08);
  --border-strong: rgba(0,0,0,0.16);
  --text-high: rgba(0,0,0,0.88);
  --text-mid: rgba(0,0,0,0.58);
  --text-low: rgba(0,0,0,0.38);
  --text-dim: rgba(0,0,0,0.20);
  --primary-soft: rgba(74,144,217,0.10);
  --primary-soft-border: rgba(74,144,217,0.22);
  --primary-soft-text: #2563eb;
  --user-bubble: #e8edf8;
  --user-bubble-text: rgba(0,0,0,0.85);
  --glow: rgba(74,144,217,0.18);
  --overlay: rgba(255,255,255,0.7);
}

/* ── Reset & base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  min-height: 100%;
  background: var(--bg);
  color: var(--text-high);
  scroll-behavior: smooth;
  transition: background-color 0.25s ease, color 0.25s ease;
}

/* ── Header ── */
#site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(150%) blur(14px);
  -webkit-backdrop-filter: saturate(150%) blur(14px);
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background 0.25s ease, border-color 0.25s ease;
}
#site-header.scrolled {
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom-color: var(--border);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

/* Logo */
.header-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}
.header-logo-text {
  color: var(--text-high);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.01em;
}
.header-logo-text span {
  background: linear-gradient(90deg, var(--grad-1), var(--grad-2), var(--grad-3));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Desktop nav */
.desktop-nav {
  display: flex;
  align-items: center;
  gap: 26px;
}
.desktop-nav a {
  color: var(--text-mid);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  transition: color 0.18s ease;
}
.desktop-nav a:hover { color: var(--text-high); }

/* Desktop actions */
.desktop-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}
.btn-login {
  color: var(--text-mid);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  padding: 8px 14px;
  border-radius: 10px;
  transition: color 0.18s ease;
}
.btn-login:hover { color: var(--text-high); }

.btn-primary-header {
  background: var(--primary);
  color: var(--primary-text);
  padding: 9px 16px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: none;
  cursor: pointer;
  transition: background 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
}
.btn-primary-header:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 10px 30px var(--glow);
}

/* Theme toggle button */
#theme-toggle {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-mid);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.18s ease, border-color 0.18s ease;
  flex-shrink: 0;
}
#theme-toggle:hover { background: var(--bg-hover); border-color: var(--border-strong); }
#theme-toggle .icon-sun, #theme-toggle .icon-moon { display: block; line-height: 0; }

/* Mobile trigger */
#mobile-trigger {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-high);
  cursor: pointer;
  align-items: center;
  justify-content: center;
}

/* Mobile drawer */
#mobile-drawer {
  display: none;
  position: fixed;
  top: 62px;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg);
  padding: 20px;
  flex-direction: column;
  gap: 8px;
  z-index: 49;
  overflow-y: auto;
  animation: fadeUp 0.25s ease-out;
}
#mobile-drawer.open { display: flex; }

#mobile-drawer a {
  color: var(--text-high);
  font-size: 17px;
  font-weight: 500;
  text-decoration: none;
  padding: 14px 12px;
  border-radius: 12px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  transition: background 0.18s ease;
}
#mobile-drawer a:hover { background: var(--bg-hover); }

.mobile-divider {
  height: 1px;
  background: var(--border);
  margin: 4px 0;
}
.mobile-btn-login {
  color: var(--text-high) !important;
  background: transparent !important;
  border: 1px solid var(--border-strong) !important;
  text-align: center;
}
.mobile-btn-primary {
  background: var(--primary) !important;
  color: var(--primary-text) !important;
  text-align: center;
  font-weight: 600 !important;
}
.mobile-theme-row {
  display: flex;
  justify-content: flex-end;
  padding-right: 4px;
  margin-top: 4px;
}

/* ── Footer ── */
#site-footer {
  border-top: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg-elevated) 50%, var(--bg));
  padding: 60px 20px 24px;
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr 1fr;
  gap: 40px;
}
.footer-brand p {
  margin-top: 14px;
  color: var(--text-mid);
  font-size: 14px;
  line-height: 1.6;
  max-width: 340px;
}
.footer-newsletter {
  margin-top: 18px;
  display: flex;
  gap: 8px;
  padding: 5px;
  border-radius: 12px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  max-width: 340px;
}
.footer-newsletter input {
  flex: 1;
  padding: 10px 12px;
  border: none;
  outline: none;
  background: transparent;
  color: var(--text-high);
  font-size: 13px;
  font-family: inherit;
}
.footer-newsletter button {
  padding: 9px 14px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  background: var(--primary);
  color: var(--primary-text);
  transition: background 0.18s ease;
}
.footer-newsletter button:hover { background: var(--primary-hover); }

.footer-socials {
  margin-top: 18px;
  display: flex;
  gap: 10px;
}
.footer-social-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-mid);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}
.footer-social-icon:hover {
  background: var(--bg-hover);
  border-color: var(--border-strong);
  color: var(--text-high);
}

.footer-col h4 {
  margin-bottom: 14px;
  font-size: 13px;
  font-weight: 700;
  color: var(--text-high);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-col ul a {
  color: var(--text-mid);
  font-size: 14px;
  text-decoration: none;
  transition: color 0.18s ease;
}
.footer-col ul a:hover { color: var(--text-high); }

.footer-bottom {
  margin-top: 44px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
  color: var(--text-low);
  font-size: 13px;
}

/* ── Page breadcrumb ── */
.page-hero {
  max-width: 1200px;
  margin: 0 auto;
  padding: 18px 20px 14px;
  background: transparent;
  border-bottom: 1px solid var(--border);
}

.page-hero h1 {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-high);
  margin-bottom: 10px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;

  width: 100%;
  min-width: 0;

  font-size: 13px;
  color: var(--text-mid);
}


.breadcrumb svg {
  flex-shrink: 0;
}

.breadcrumb a {
  color: var(--text-mid);
  text-decoration: none;
  transition: color 0.18s ease;
  flex-shrink: 0;
}

.breadcrumb a:hover {
  color: var(--primary);
}

.breadcrumb-sep {
  color: var(--text-dim);
  flex-shrink: 0;
}

.breadcrumb-current {
  color: var(--primary-soft-text);
  font-weight: 500;

  flex: 1;
  min-width: 0;

  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Mobile */
@media (max-width: 600px) {
  .breadcrumb {
    font-size: 12px;
  }
}

/* ── Shared animations ── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(18px); }
  to   { opacity: 1; transform: translateY(0); }
}
.gradient-text {
  background: linear-gradient(to right, var(--primary), var(--grad-1), var(--grad-2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ── Responsive ── */
@media (max-width: 860px) {
  .desktop-nav, .desktop-actions { display: none; }
  #mobile-trigger { display: flex; }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .footer-brand {
    grid-column: 1 / -1;
  }
}
@media (max-width: 560px) {
  .footer-grid { grid-template-columns: 1fr; }
}