/* ============================================================
   BASE / RESET
   ============================================================ */
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.5;
    background: var(--bg-body);
    color: var(--text-primary);
}
h1 { font-size: var(--font-size-h1); font-weight: 600; color: var(--color-primary); margin-bottom: 20px; }
h2 { font-size: var(--font-size-h2); font-weight: 600; color: var(--color-primary); margin-bottom: 15px; }
h3 { font-size: var(--font-size-h3); font-weight: 600; color: var(--color-primary); margin-bottom: 10px; }
[data-theme="dark"] h1,
[data-theme="dark"] h2,
[data-theme="dark"] h3 { color: var(--text-primary); }
a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }
[data-theme="dark"] a { color: var(--color-primary-light); }

/* ============================================================
   SIDEBAR
   ============================================================ */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 250px;
    height: 100vh;
    background: var(--bg-sidebar);
    display: flex;
    flex-direction: column;
    z-index: var(--z-sidebar);
    overflow-y: auto;
}
.sidebar-header {
    padding: 20px 20px 16px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}
.sidebar-logo {
    height: 32px;
    width: auto;
}
.sidebar-nav {
    flex: 1;
    padding: 12px 0;
}
.sidebar-link {
    display: block;
    padding: 10px 20px;
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    font-size: var(--font-size-base);
    font-weight: 500;
    border-left: 3px solid transparent;
    transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.sidebar-link:hover {
    background: rgba(255,255,255,0.1);
    color: #fff;
    text-decoration: none;
}
.sidebar-link.active {
    border-left-color: var(--color-accent);
    background: rgba(255,255,255,0.1);
    color: #fff;
    font-weight: 600;
}
.sidebar-divider {
    height: 1px;
    background: rgba(255,255,255,0.15);
    margin: 8px 20px;
}
.sidebar-footer {
    padding: 16px 20px;
    border-top: 1px solid rgba(255,255,255,0.1);
}
.sidebar-user {
    color: #fff;
    font-size: var(--font-size-sm);
    font-weight: 600;
    margin-bottom: 8px;
}
.sidebar-footer-link {
    display: block;
    color: rgba(255,255,255,0.6);
    text-decoration: none;
    font-size: var(--font-size-sm);
    padding: 4px 0;
    transition: color 0.15s;
}
.sidebar-footer-link:hover {
    color: #fff;
    text-decoration: none;
}
.sidebar-logout {
    background: none;
    border: none;
    cursor: pointer;
    font-family: inherit;
    font-size: var(--font-size-sm);
    color: rgba(255,255,255,0.6);
    padding: 4px 0;
    width: auto;
    text-align: left;
}
.sidebar-logout:hover {
    color: var(--color-accent);
}
.sidebar-logout-form {
    margin: 0;
}
.sidebar-theme-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 10px;
    padding: 6px 0;
    color: rgba(255,255,255,0.6);
    font-size: var(--font-size-sm);
    cursor: pointer;
    background: none;
    border: none;
    font-family: inherit;
    transition: color 0.15s;
}
.sidebar-theme-toggle:hover {
    color: #fff;
}
.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: var(--z-sidebar-overlay);
}

/* ============================================================
   TOPBAR (mobile only)
   ============================================================ */
.topbar {
    display: none;
}
.hamburger {
    display: flex;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}
.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-primary);
    border-radius: 2px;
    transition: transform 0.2s;
}
.topbar-logo { margin-left: 12px; line-height: 0; }
.topbar-logo-img { height: 24px; width: auto; }

/* ============================================================
   CONTENT AREA
   ============================================================ */
.content {
    margin-left: 250px;
    padding: var(--spacing-lg) 30px;
    min-height: 100vh;
}

/* ============================================================
   RESPONSIVE (< 992px)
   ============================================================ */
@media (max-width: 991px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.25s ease;
    }
    .sidebar.open {
        transform: translateX(0);
    }
    .sidebar-overlay.open {
        display: block;
    }
    .topbar {
        display: flex;
        align-items: center;
        padding: 12px 20px;
        background: var(--color-primary);
        border-bottom: none;
        position: sticky;
        top: 0;
        z-index: var(--z-topbar);
    }
    .hamburger span {
        background: #fff;
    }
    .content {
        margin-left: 0;
        padding: 20px;
    }
}