/* ========== Reset & Variables ========== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --forest: #1a3a2e;
  --forest-2: #245043;
  --ocean: #0d7377;
  --ocean-2: #14a098;
  --sand: #f5e6c8;
  --sand-2: #faf6ef;
  --sun: #e07a3c;
  --sun-2: #f2a65a;
  --ink: #231c12;
  --ink-soft: #5a4e3a;
  --line: #e3d8bf;
  --card: #ffffff;
  --shadow: 0 6px 22px rgba(36,52,42,.10);
  --shadow-lg: 0 14px 40px rgba(36,52,42,.16);
  --radius: 14px;
  --transition: 0.2s ease;
  --bg-sidebar: #0d2620;
  --bg-sidebar-hover: rgba(255,255,255,0.08);
  --accent: var(--sun);
  --accent-text: #fff;
}
html { scroll-behavior: smooth; scroll-padding-top: 24px; }

/* ========== Base Layout ========== */
body {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  color: var(--ink);
  background: var(--sand-2);
  line-height: 1.7;
  display: flex;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

/* ========== Sidebar ========== */
nav.sidebar {
  width: 260px; min-width: 260px;
  background: var(--bg-sidebar);
  padding: 24px 0;
  position: sticky; top: 0;
  height: 100vh; overflow-y: auto;
  display: flex; flex-direction: column;
  z-index: 10;
  color: #c8d8d3;
}
.sidebar-logo { padding: 0 20px 20px; border-bottom: 1px solid rgba(255,255,255,0.1); margin-bottom: 16px; }
.sidebar-logo h1 { font-size: 1.2rem; color: var(--sun-2); letter-spacing: 0.5px; display: flex; align-items: center; gap: 8px; }
.sidebar-logo h1 .logo-sq {
  width: 30px; height: 30px; border-radius: 8px; display: inline-grid; place-items: center;
  background: linear-gradient(135deg, var(--sun), var(--sun-2)); font-size: 16px;
  box-shadow: 0 2px 8px rgba(224,122,60,.5);
}
.sidebar-logo p { font-size: 0.76rem; color: #9fb8b3; margin-top: 2px; }
.lang-switcher { padding: 0 20px 12px; border-bottom: 1px solid rgba(255,255,255,0.08); margin-bottom: 12px; font-size: 0.78rem; display: flex; gap: 6px; align-items: center; color: #9fb8b3; }
.lang-switcher a { color: var(--sun-2); }
.lang-switcher a:hover { text-decoration: underline; }
.lang-switcher .active { color: #9fb8b3; cursor: default; }
.nav-section { padding: 8px 20px 4px; font-size: 0.68rem; text-transform: uppercase; letter-spacing: 1px; color: #7a9a90; margin-top: 8px; }
.nav-item { display: block; padding: 8px 20px; color: #b8ccc6; font-size: 0.9rem; border-left: 3px solid transparent; transition: var(--transition); }
.nav-item:hover { background: var(--bg-sidebar-hover); color: #fff; }
.nav-item.active { border-left-color: var(--sun); background: rgba(224,122,60,0.12); color: var(--sun-2); }
.nav-item .icon { margin-right: 8px; }
.nav-badge { float: right; font-size: 0.65rem; background: var(--sun); color: #fff; padding: 1px 6px; border-radius: 10px; margin-top: 2px; }
.nav-footer { margin-top: auto; padding: 16px 20px 0; border-top: 1px solid rgba(255,255,255,0.08); font-size: 0.72rem; color: #7a9a90; }
.nav-footer a { color: var(--sun-2); }
.nav-footer a:hover { text-decoration: underline; }

/* Theme toggle in sidebar */
.theme-toggle { display: flex; align-items: center; gap: 8px; padding: 8px 16px; margin: 12px 12px 0; background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.1); border-radius: 10px; cursor: pointer; font-size: 0.85rem; color: #b8ccc6; font-family: inherit; transition: var(--transition); }
.theme-toggle:hover { border-color: var(--sun-2); }
.theme-toggle .toggle-thumb { width: 36px; height: 20px; background: rgba(255,255,255,0.15); border-radius: 10px; position: relative; transition: background var(--transition); }
.theme-toggle .toggle-thumb::after { content: ''; position: absolute; top: 2px; left: 2px; width: 16px; height: 16px; background: #fff; border-radius: 50%; transition: transform var(--transition); }
body.light .toggle-thumb { background: var(--sun); }
body.light .toggle-thumb::after { transform: translateX(16px); }

/* ========== Mobile Nav ========== */
.mobile-nav-toggle { display: none; position: fixed; top: 12px; left: 12px; z-index: 100; background: var(--bg-sidebar); border: 1px solid rgba(255,255,255,0.15); color: #fff; padding: 8px 12px; border-radius: 8px; cursor: pointer; font-size: 1.2rem; }
.sidebar-overlay { display: none; }

/* ========== Main Content Area ========== */
main { flex: 1; overflow-y: auto; }

/* ========== Dark Mode ========== */
body.dark {
  --sand: #2a2418; --sand-2: #15110a; --ink: #e8dcc4; --ink-soft: #b8aa8a;
  --line: #3a3225; --card: #1e1a12;
  --shadow: 0 6px 22px rgba(0,0,0,.4); --shadow-lg: 0 14px 40px rgba(0,0,0,.55);
  --bg-sidebar: #0a1a14;
}
body.dark .sidebar { background: var(--bg-sidebar); }
body.light {
  --sand: #f5e6c8; --sand-2: #faf6ef; --ink: #231c12; --ink-soft: #5a4e3a;
  --line: #e3d8bf; --card: #ffffff;
  --shadow: 0 6px 22px rgba(36,52,42,.10); --shadow-lg: 0 14px 40px rgba(36,52,42,.16);
  --bg-sidebar: #1a3a2e;
}

/* ========== Responsive Sidebar ========== */
@media (max-width: 768px) {
  body { flex-direction: column; }
  nav.sidebar { position: fixed; left: -280px; top: 0; width: 280px; height: 100vh; transition: left var(--transition); }
  nav.sidebar.open { left: 0; }
  .sidebar-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.5); z-index: 9; }
  .sidebar-overlay.open { display: block; }
  .mobile-nav-toggle { display: block; }
}

/* ========== Print ========== */
@media print { nav.sidebar, .mobile-nav-toggle { display: none; } }