:root {
    --sidebar-bg: #ffffff;
    --sidebar-border: #e5e7eb;
    --sidebar-hover: #f3f4f6;
    --sidebar-active: #eef2ff;
    --sidebar-text: #111827;
    --sidebar-muted: #9ca3af;
    --sidebar-accent: #2563eb;


    --radius-lg: 18px;
    --radius-full: 999px;

    --shadow-soft: 0 18px 40px rgba(148, 163, 184, 0.35);

    --font-main: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text",
        "Segoe UI", sans-serif;
}

.app {
    min-height: 100vh;
    display: flex;
    flex-direction: row;
}

.sidebar {
    width: 280px;
    background: var(--sidebar-bg);
    border-right: 1px solid var(--sidebar-border);
    box-shadow: 0 0 0 1px rgba(148, 163, 184, 0.1);
    box-shadow: var(--shadow-soft);
    padding: 14px 14px 16px;
    display: flex;
    flex-direction: column;
    transition: width 0.18s ease;
    position: relative;
    z-index: 10;
}

.sidebar.collapsed {
    width: 76px;
}

/* SIDEBAR HEADER */

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6px 6px 10px;
    margin-bottom: 4px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 8px;
    min-width: 0;
}

.brand-logo {
    width: 32px;
    height: 32px;
    border-radius: 12px;
    background: radial-gradient(circle at 30% 20%, #60a5fa 0, #2563eb 45%, #1e40af 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 18px;
    flex-shrink: 0;
}

.brand-name {
    font-weight: 600;
    letter-spacing: 0.04em;
    font-size: 17px;
    white-space: nowrap;
}

.sidebar.collapsed .brand-name {
    display: none;
}

.icon-button {
    border: 1px solid var(--sidebar-border);
    background: #f9fafb;
    border-radius: var(--radius-full);
    padding: 6px 8px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--sidebar-muted);
    cursor: pointer;
    font-size: 14px;
    transition: background-color 0.12s ease, color 0.12s ease,
        border-color 0.12s ease, transform 0.05s ease;
}

.icon-button.small {
    padding: 4px 6px;
    font-size: 12px;
}

.icon-button:hover {
    background: #ffffff;
    color: var(--sidebar-text);
    border-color: #cbd5e1;
    transform: translateY(-1px);
}

/* NAVIGATION */

.sidebar-nav {
    flex: 1;
    overflow: hidden;
    padding: 8px 6px 6px;
}

.nav-scroll {
    max-height: 100%;
    overflow-y: auto;
    padding-right: 6px;
}

.nav-section-label {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.16em;
    color: var(--sidebar-muted);
    margin: 14px 8px 6px;
}

.nav-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.nav-item {
    margin-bottom: 2px;
}

.nav-link {
    position: relative;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 9px 10px;
    border-radius: 12px;
    color: var(--sidebar-text);
    text-decoration: none;
    font-size: 14px;
    cursor: pointer;
    transition: background-color 0.12s ease, color 0.12s ease;
}

.nav-link:hover {
    background: var(--sidebar-hover);
}

.nav-item.active>.nav-link {
    background: var(--sidebar-active);
    color: #111827;
}

.nav-icon {
    width: 26px;
    height: 26px;
    border-radius: 10px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    background: #f3f4f6;
    color: var(--sidebar-muted);
    font-size: 15px;
}

.nav-item.active .nav-icon {
    background: #eef2ff;
    color: var(--sidebar-accent);
}

.nav-label {
    white-space: nowrap;
}

.nav-meta {
    margin-left: auto;
    font-size: 11px;
    min-width: 18px;
    height: 18px;
    border-radius: var(--radius-full);
    background: #f9fafb;
    border: 1px solid var(--sidebar-border);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--sidebar-muted);
}

.nav-chevron {
    margin-left: auto;
    font-size: 11px;
    color: var(--sidebar-muted);
}

.nav-item.has-children.open>.nav-link .nav-chevron {
    transform: rotate(90deg);
}

/* Subnav */

.subnav {
    list-style: none;
    margin: 4px 0 6px 32px;
    padding-left: 4px;
    border-left: 1px solid #e5e7eb;
    display: none;
}

.nav-item.has-children.open .subnav {
    display: block;
}

.subnav .nav-link {
    padding: 7px 9px;
    border-radius: 10px;
    font-size: 13px;
    color: var(--sidebar-muted);
}

.subnav .nav-item.active>.nav-link {
    background: var(--sidebar-active);
    color: var(--sidebar-text);
}

/* Project dots */

.project-dot {
    width: 10px;
    height: 10px;
    border-radius: 999px;
    margin-right: 8px;
    flex-shrink: 0;
}

.project-personal {
    background: #2563eb;
}

.project-business {
    background: #16a34a;
}

.project-travel {
    background: #38bdf8;
}

/* FOOTER */

.sidebar-footer {
    padding: 8px 6px 2px;
    border-top: 1px solid var(--sidebar-border);
    margin-top: 4px;
}

.help-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 10px;
    border-radius: 12px;
    color: var(--sidebar-muted);
    text-decoration: none;
    font-size: 13px;
    cursor: pointer;
}

.help-link:hover {
    background: var(--sidebar-hover);
    color: var(--sidebar-text);
}

.help-link .nav-icon {
    background: transparent;
    border-radius: 999px;
    border: 1px solid var(--sidebar-border);
}

.user {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 10px;
    padding: 8px 10px;
    border-radius: 14px;
    background: #f9fafb;
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 999px;
    background: linear-gradient(135deg, #3b82f6, #a855f7);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    font-size: 15px;
    flex-shrink: 0;
}

.user-info {
    min-width: 0;
    flex: 1;
}

.user-name {
    font-size: 13px;
    font-weight: 500;
}

.user-role {
    font-size: 11px;
    color: var(--sidebar-muted);
    white-space: nowrap;
}

/* COLLAPSED STATE */

.sidebar.collapsed .nav-label,
.sidebar.collapsed .nav-meta,
.sidebar.collapsed .nav-chevron,
.sidebar.collapsed .subnav,
.sidebar.collapsed .nav-section-label,
.sidebar.collapsed .help-link .nav-label,
.sidebar.collapsed .user-info,
.sidebar.collapsed .user .icon-button {
    display: none;
}

.sidebar.collapsed .user {
    justify-content: center;
    background: transparent;
    padding-inline: 0;
}

.sidebar.collapsed .help-link {
    justify-content: center;
    padding-inline: 6px;
}

.sidebar.collapsed .nav-link {
    justify-content: center;
    padding: 10px 0;
}

.sidebar.collapsed .nav-scroll {
    overflow-y: visible;
}

/* Tooltips when collapsed */

.sidebar.collapsed .nav-link[data-tooltip]:hover::after,
.sidebar.collapsed .help-link[data-tooltip]:hover::after {
    content: attr(data-tooltip);
    position: fixed;
    left: 88px;
    background: #111827;
    color: #f9fafb;
    padding: 6px 9px;
    border-radius: 8px;
    font-size: 11px;
    white-space: nowrap;
    box-shadow: 0 10px 25px rgba(15, 23, 42, 0.4);
    z-index: 20;
}

/* RESPONSIVE */

@media (max-width: 768px) {
    .app {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        display: flex;
        flex-direction: column;
    }

    .sidebar.collapsed {
        width: 100%;
    }

    .sidebar.collapsed .nav-label,
    .sidebar.collapsed .nav-meta,
    .sidebar.collapsed .nav-chevron,
    .sidebar.collapsed .nav-section-label,
    .sidebar.collapsed .help-link .nav-label,
    .sidebar.collapsed .user-info,
    .sidebar.collapsed .user .icon-button {
        /* keep labels visible on small screens even if collapsed toggled */
        display: initial;
    }

    .sidebar.collapsed .nav-link {
        justify-content: flex-start;
        padding: 9px 10px;
    }

    .sidebar.collapsed .user {
        justify-content: flex-start;
        padding-inline: 10px;
    }

    .sidebar.collapsed .nav-scroll {
        overflow-y: auto;
    }
}