/* ============================================
   3. LAYOUT SHELL
   ============================================ */
.dashboard-container {
    display: flex;
    min-height: 100vh;
    width: 100%;
}

/* ============================================
   4. SIDEBAR
   ============================================ */
.sidebar {
    width: var(--sidebar-w);
    min-width: var(--sidebar-w);
    background: var(--surface-raised);
    border-right: 1px solid var(--border-subtle);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 16px 0;
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 200;
    transition: width var(--duration-slow) var(--ease-out-expo),
                min-width var(--duration-slow) var(--ease-out-expo);
    overflow: hidden;
}

.sidebar:hover {
    width: var(--sidebar-w-open);
    min-width: var(--sidebar-w-open);
    box-shadow: var(--shadow-xl), 4px 0 24px rgba(0, 0, 0, 0.2);
}

/* Brand mark */
.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 20px 24px;
    white-space: nowrap;
    overflow: hidden;
}

.sidebar-brand-icon {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    background: var(--brand-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 16px;
    font-weight: 800;
    color: #fff;
    letter-spacing: -1px;
    transition: transform var(--duration) var(--ease-spring),
                box-shadow var(--duration) var(--ease);
}

.sidebar:hover .sidebar-brand-icon {
    transform: rotate(-6deg) scale(1.08);
    box-shadow: 0 0 16px rgba(99, 102, 241, 0.35);
}

.sidebar-brand-text {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    opacity: 0;
    transform: translateX(-8px);
    transition: opacity var(--duration) var(--ease),
                transform var(--duration) var(--ease);
}

.sidebar:hover .sidebar-brand-text {
    opacity: 1;
    transform: translateX(0);
}

/* Nav links */
.sidebar-nav {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding: 0 12px;
    overflow-y: auto;
    overflow-x: hidden;
}

.sidebar .nav-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 11px 14px;
    border-radius: var(--radius-md);
    color: var(--text-muted);
    font-size: 14px;
    font-weight: 500;
    white-space: nowrap;
    position: relative;
    transition: color var(--duration-fast) var(--ease),
                background var(--duration-fast) var(--ease),
                transform var(--duration-fast) var(--ease-spring);
    -webkit-tap-highlight-color: transparent;
}

.sidebar .nav-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%) scaleY(0);
    width: 3px;
    height: 60%;
    border-radius: 0 4px 4px 0;
    background: var(--brand);
    transition: transform var(--duration) var(--ease);
}

.sidebar .nav-item i {
    font-size: 18px;
    width: 22px;
    text-align: center;
    flex-shrink: 0;
    transition: transform var(--duration-fast) var(--ease-spring),
                color var(--duration-fast) var(--ease),
                filter var(--duration) var(--ease);
}

.sidebar .nav-item span {
    opacity: 0;
    transform: translateX(-6px);
    transition: opacity var(--duration) var(--ease),
                transform var(--duration) var(--ease);
}

.sidebar:hover .nav-item span {
    opacity: 1;
    transform: translateX(0);
}

.sidebar .nav-item:hover {
    color: var(--text-primary);
    background: var(--surface-interactive-hover);
}

.sidebar .nav-item:hover::before {
    transform: translateY(-50%) scaleY(1);
}

.sidebar .nav-item:hover i {
    transform: scale(1.15);
    color: var(--brand);
    filter: drop-shadow(0 0 6px rgba(99, 102, 241, 0.4));
}

.sidebar .nav-item:active {
    transform: scale(0.97);
}

/* Sidebar footer */
.sidebar-footer {
    padding: 0 12px;
    border-top: 1px solid var(--border-subtle);
    padding-top: 12px;
    margin-top: 8px;
}

.sidebar .nav-item.logout {
    color: var(--danger);
}

.sidebar .nav-item.logout:hover {
    background: var(--danger-muted);
    color: var(--danger);
    box-shadow: var(--danger-glow);
}

.sidebar .nav-item.logout:active {
    transform: scale(0.97);
}

/* ============================================
   5. MAIN CONTENT AREA
   ============================================ */
.main {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    transition: margin-left var(--duration-slow) var(--ease);
}

.dashboard-container > .main-wrapper {
    margin-left: var(--sidebar-w);
    transition: margin-left var(--duration-slow) var(--ease);
    display: flex;
    flex-direction: column;
    flex: 1;
    min-height: 100vh;
}

/* Page header / top bar */
header {
    height: var(--topbar-h);
    background: var(--surface-glass);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    border-bottom: 1px solid var(--border-subtle);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 32px;
    position: sticky;
    top: 0;
    z-index: 100;
}

header::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(99, 102, 241, 0.3), transparent);
    opacity: 0.6;
}

header div {
    font-size: 17px;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 12px;
}

header div i {
    color: var(--brand);
    font-size: 18px;
    transition: transform var(--duration) var(--ease-spring),
                filter var(--duration) var(--ease);
}

header div:hover i {
    transform: rotate(-8deg) scale(1.1);
    filter: drop-shadow(0 0 6px rgba(99, 102, 241, 0.4));
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.header-date {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-muted);
    padding: 6px 14px;
    background: var(--surface-card);
    border-radius: var(--radius-full);
    border: 1px solid var(--border-subtle);
    transition: border-color var(--duration-fast) var(--ease),
                color var(--duration-fast) var(--ease);
}

.header-date:hover {
    border-color: var(--border-interactive);
    color: var(--text-secondary);
}

/* Content area */
.content {
    flex: 1;
    padding: 28px 32px;
    animation: pageEnter var(--duration-enter) var(--ease-out-expo) both;
}

@keyframes pageEnter {
    from { opacity: 0; transform: translateY(16px) scale(0.995); }
    to   { opacity: 1; transform: translateY(0) scale(1); }
}

/* Page title inside content (h3) */
.content h3,
.main > h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text-primary);
}

/* Footer */
footer {
    padding: 20px 32px;
    font-size: 12px;
    color: var(--text-muted);
    border-top: 1px solid var(--border-subtle);
    text-align: center;
    position: relative;
    transition: color var(--duration-fast) var(--ease);
}

footer::before {
    content: '';
    position: absolute;
    top: -1px;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(99, 102, 241, 0.15), transparent);
}

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