:root {
    --bg: #f5f7fb;
    --surface: #ffffff;
    --surface-2: #f8fafc;
    --border: #e5e7eb;
    --text: #111827;
    --muted: #6b7280;
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-soft: #dbeafe;

    --sidebar-width: 270px;
    --sidebar-collapsed: 88px;
    --topbar-height: 72px;

    --radius-lg: 18px;
    --radius-md: 14px;
    --radius-sm: 10px;

    --shadow-sm: 0 2px 10px rgba(15, 23, 42, 0.04);
    --shadow-md: 0 12px 32px rgba(15, 23, 42, 0.08);

    --transition: 0.25s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html,
body {
    min-height: 100%;
}

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg);
    color: var(--text);
}

a {
    text-decoration: none;
    color: inherit;
}

button,
input {
    font: inherit;
}

.app-shell {
    min-height: 100vh;
    background: var(--bg);
}

/* SIDEBAR */
.sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: var(--sidebar-width);
    background: var(--surface);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    z-index: 1100;
    transition: width var(--transition), transform var(--transition);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.sidebar.collapsed {
    width: var(--sidebar-collapsed);
}

.sidebar-header {
    height: var(--topbar-height);
    padding: 0 20px;
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 0;
}

.brand-icon {
    width: 42px;
    height: 42px;
    border-radius: 14px;
    background: linear-gradient(135deg, #2563eb, #3b82f6);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    flex-shrink: 0;
    box-shadow: var(--shadow-sm);
}

.brand-text {
    min-width: 0;
    transition: opacity var(--transition), transform var(--transition);
}

.brand-text h1 {
    font-size: 1rem;
    line-height: 1.1;
    font-weight: 700;
    color: var(--text);
}

.brand-text p {
    font-size: 0.78rem;
    color: var(--muted);
    margin-top: 2px;
    white-space: nowrap;
}

.sidebar.collapsed .brand-text {
    opacity: 0;
    transform: translateX(-8px);
    pointer-events: none;
    width: 0;
    overflow: hidden;
}

.sidebar-body {
    padding: 18px 14px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex: 1;
    overflow-y: auto;
}

.nav-label {
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    padding: 10px 12px 6px;
    transition: opacity var(--transition);
}

.sidebar.collapsed .nav-label {
    opacity: 0;
    height: 0;
    padding: 0;
    overflow: hidden;
}

.nav-item {
    min-height: 50px;
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 12px 14px;
    border-radius: 14px;
    color: #374151;
    transition: var(--transition);
    overflow: hidden;
}

.nav-item i {
    width: 22px;
    text-align: center;
    font-size: 1rem;
    flex-shrink: 0;
}

.nav-item span {
    white-space: nowrap;
    transition: opacity var(--transition), transform var(--transition);
}

.sidebar.collapsed .nav-item {
    justify-content: center;
    padding: 12px;
}

.sidebar.collapsed .nav-item span {
    opacity: 0;
    transform: translateX(-8px);
    width: 0;
    overflow: hidden;
}

.nav-item:hover {
    background: var(--surface-2);
    color: var(--text);
}

.nav-item.active {
    background: var(--primary-soft);
    color: var(--primary);
    font-weight: 600;
}

.sidebar-footer {
    padding: 16px 18px;
    border-top: 1px solid var(--border);
    color: var(--muted);
    font-size: 0.8rem;
    transition: opacity var(--transition);
}

.sidebar.collapsed .sidebar-footer {
    opacity: 0;
    pointer-events: none;
}

/* MAIN */
.main {
    min-height: 100vh;
    margin-left: var(--sidebar-width);
    transition: margin-left var(--transition);
    display: flex;
    flex-direction: column;
}

.main.expanded {
    margin-left: var(--sidebar-collapsed);
}

/* TOPBAR */
.topbar {
    position: sticky;
    top: 0;
    z-index: 900;
    height: var(--topbar-height);
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
}

.topbar-left {
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 0;
}

.topbar-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.page-heading {
    min-width: 0;
}

.page-heading h2 {
    font-size: 1.25rem;
    line-height: 1.1;
    font-weight: 700;
    color: var(--text);
}

.page-heading p {
    font-size: 0.87rem;
    color: var(--muted);
    margin-top: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* BOTÕES */
.icon-btn {
    width: 42px;
    height: 42px;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: var(--surface);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--muted);
    cursor: pointer;
    transition: var(--transition);
    flex-shrink: 0;
}

.icon-btn:hover {
    background: var(--surface-2);
    color: var(--text);
}

.mobile-menu-btn {
    display: none;
}

.topbar-toggle {
    display: inline-flex;
}

/* PAGE */
.page-content {
    padding: 24px;
}

.content-inner {
    max-width: 1440px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

/* OVERLAY */
.sidebar-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.35);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.sidebar-overlay.show {
    opacity: 1;
    visibility: visible;
}

/* TABLET / MOBILE */
@media (max-width: 920px) {
    .sidebar {
        transform: translateX(-100%);
        width: min(84vw, 290px);
    }

    .sidebar.mobile-open {
        transform: translateX(0);
    }

    .sidebar.collapsed {
        width: min(84vw, 290px);
    }

    .main,
    .main.expanded {
        margin-left: 0;
    }

    .topbar {
        padding: 0 16px;
    }

    .page-content {
        padding: 16px;
    }

    .page-heading h2 {
        font-size: 1.08rem;
    }

    .page-heading p {
        font-size: 0.8rem;
        white-space: normal;
    }

    .topbar-toggle {
        display: none;
    }

    .mobile-menu-btn {
        display: inline-flex;
    }
}

@media (max-width: 640px) {
    .topbar {
        height: auto;
        min-height: var(--topbar-height);
        padding-top: 12px;
        padding-bottom: 12px;
        align-items: flex-start;
        flex-direction: column;
        gap: 12px;
    }

    .topbar-left,
    .topbar-right {
        width: 100%;
    }

    .topbar-right {
        justify-content: flex-start;
        flex-wrap: wrap;
    }

    .page-content {
        padding: 14px;
    }
}