:root {
    --app-bg: #FAF7F2;
    --app-border: #E8E3DA;
    --app-text: #2D2D2D;
    --app-brand-soft: #e7f0ff;
    --app-brand: #0b7a8f;
    --app-brand-deep: #0f4f64;
    --app-surface: rgba(255, 253, 248, 0.92);
    --app-sidebar-width: 220px;
    --app-sidebar-collapsed: 60px;
    --app-font-serif: 'Instrument Serif', serif;
    --app-viewport-height: 100vh;
}

@supports (height: 100svh) {
    :root {
        --app-viewport-height: 100svh;
    }
}

@supports (height: 100dvh) {
    :root {
        --app-viewport-height: 100dvh;
    }
}

html { font-size: 14px; }
@media (min-width: 768px) { html { font-size: 16px; } }
body {
    font-family: "Poppins", sans-serif;
    color: var(--app-text);
    background:
        radial-gradient(circle at top, rgba(11, 122, 143, 0.05), transparent 24rem),
        linear-gradient(180deg, #FAF7F2 0%, #F5F0E8 100%);
}

/* Shell */
.app-shell {
    min-height: var(--app-viewport-height);
    align-items: flex-start;
    overflow-x: clip;
    overflow-y: visible;
}

/* Sidebar */
.app-sidebar {
    width: var(--app-sidebar-width);
    height: var(--app-viewport-height);
    flex-shrink: 0;
    position: sticky;
    top: 0;
    align-self: flex-start;
    background:
        linear-gradient(180deg, #F4EDE4 0%, #EDE5D8 100%);
    border-right: 1px solid rgba(180, 165, 140, 0.3);
    box-shadow: 18px 0 40px rgba(45, 35, 20, 0.04);
    transition: width 0.2s ease;
    z-index: 1020;
    overflow: visible;
}
.app-sidebar .brand-text,
.app-sidebar .nav-label,
.app-sidebar .sidebar-footer { transition: opacity 0.2s ease; }

/* Sidebar collapsed */
.sidebar-collapsed .app-sidebar { width: var(--app-sidebar-collapsed); padding-left: 0.5rem !important; padding-right: 0.5rem !important; }
.sidebar-collapsed .app-sidebar .brand-text,
.sidebar-collapsed .app-sidebar .nav-label,
.sidebar-collapsed .app-sidebar .sidebar-footer { opacity: 0; width: 0; overflow: hidden; }
.sidebar-collapsed .app-sidebar .nav-link { justify-content: center; }
.sidebar-collapsed .app-sidebar .sidebar-brand { justify-content: center; }

/* Sidebar handle */
.sidebar-handle {
    position: absolute;
    right: -15px;
    top: 20px;
    width: 29px;
    height: 29px;
    background: #FAF7F2;
    border: none;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: #6c757d;
    font-size: 0.65rem;
    z-index: 1021;
    transition: background 0.15s, color 0.15s;
}
.sidebar-handle:hover { background: rgba(11, 122, 143, 0.12); color: var(--app-brand-deep); }
.sidebar-collapsed .sidebar-handle .handle-icon { transform: rotate(180deg); }

/* Nav links */
.app-nav .nav-link {
    color: var(--app-text);
    border-radius: 14px;
    padding: 0.7rem 0.85rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.2rem;
    position: relative;
    overflow: visible;
    transition: background-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}
.app-nav .nav-link .nav-alert-badge {
    margin-left: auto;
    min-width: 1.65rem;
    height: 1.65rem;
    padding: 0 0.42rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
    font-size: 0.72rem;
    box-shadow: 0 8px 18px rgba(220, 53, 69, 0.22);
}
.app-nav .nav-link:hover {
    background: rgba(11, 122, 143, 0.08);
    color: var(--app-brand-deep);
    transform: translateX(1px);
}
.app-nav .nav-link.nav-link-logout:hover { background: #fff0f0; color: #b02a37; }
.app-nav .nav-link.active {
    background: rgba(11, 122, 143, 0.1);
    color: var(--app-brand-deep);
    font-weight: 600;
}
.sidebar-collapsed .app-sidebar .nav-link .nav-alert-badge {
    position: absolute;
    top: 0.3rem;
    right: 0.2rem;
    margin-left: 0;
    min-width: 1.25rem;
    height: 1.25rem;
    padding: 0 0.28rem;
    font-size: 0.66rem;
}

/* Main */
.app-main {
    min-width: 0;
    width: 100%;
    min-height: var(--app-viewport-height);
    overflow: visible;
}
.app-content { padding: 1rem; padding-bottom: 4rem; }
@media (min-width: 992px) { .app-content { padding: 1.5rem; padding-bottom: 4rem; } }

/* Public layout */
.public-layout { padding-top: 56px; }
.public-navbar {
    background: rgba(248, 252, 253, 0.82);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(165, 186, 198, 0.3);
    box-shadow: 0 10px 30px rgba(15, 79, 100, 0.08);
}
.public-layout main.container {
    max-width: 1080px;
    padding-top: 2.5rem;
    padding-bottom: 3rem;
}

.site-footer {
    border-top: 1px solid rgba(165, 186, 198, 0.24);
    background: rgba(248, 252, 253, 0.9);
    backdrop-filter: blur(10px);
}

.site-footer p,
.site-footer a,
.public-navbar .navbar-brand,
.public-navbar .nav-link {
    color: var(--app-brand-deep);
}

.public-navbar .navbar-brand {
    font-weight: 700;
    letter-spacing: -0.03em;
}

.public-navbar .btn-outline-success,
.public-navbar .btn-outline-primary {
    border-radius: 999px;
    padding-left: 1rem;
    padding-right: 1rem;
}

.public-navbar .btn-outline-success {
    border-color: rgba(11, 122, 143, 0.4);
    color: var(--app-brand-deep);
}

.public-navbar .btn-outline-primary {
    border-color: rgba(15, 79, 100, 0.32);
    color: var(--app-brand-deep);
}

/* Toasts */
.toast.toast-custom {
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid rgba(0, 0, 0, 0.1);
}
.toast-header.toast-header-custom {
    background-color: transparent;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}
.toast.toast-custom .toast-header { color: inherit; }
.toast.toast-custom.bg-success .btn-close,
.toast.toast-custom.bg-danger .btn-close { filter: invert(1) grayscale(100%) brightness(200%); }