:root {
    --sge-color-bg: #f5f5f7;
    --sge-color-surface: #ffffff;
    --sge-color-surface-soft: #fafafc;
    --sge-color-border: #e6e6ea;
    --sge-color-border-strong: #d2d2d7;
    --sge-color-text: #1d1d1f;
    --sge-color-text-soft: #515154;
    --sge-color-text-muted: #86868b;
    --sge-color-primary: #0071e3;
    --sge-color-primary-soft: #e8f1fd;
    --sge-color-primary-hover: #005bb5;
    --sge-color-success: #34c759;
    --sge-color-success-soft: #e6f7ec;
    --sge-color-warning: #ff9f0a;
    --sge-color-warning-soft: #fff4e0;
    --sge-color-danger: #ff3b30;
    --sge-color-danger-soft: #ffe7e6;
    --sge-color-info: #5ac8fa;
    --sge-color-info-soft: #e3f6ff;
    --sge-radius-sm: 8px;
    --sge-radius: 14px;
    --sge-radius-lg: 20px;
    --sge-shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
    --sge-shadow: 0 4px 16px rgba(0,0,0,0.06);
    --sge-shadow-lg: 0 12px 32px rgba(0,0,0,0.08);
    --sge-sidebar-width: 256px;
    --sge-topbar-height: 72px;
    --sge-font: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro Display', system-ui, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    height: 100%;
    font-family: var(--sge-font);
    color: var(--sge-color-text);
    background: var(--sge-color-bg);
    font-size: 15px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a { color: var(--sge-color-primary); text-decoration: none; }
a:hover { color: var(--sge-color-primary-hover); }

.sge-shell {
    display: grid;
    grid-template-columns: var(--sge-sidebar-width) 1fr;
    min-height: 100vh;
}

.sge-content {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.sge-anon-main { min-height: 100vh; }

.sge-main {
    flex: 1;
    padding: 24px clamp(16px, 3vw, 40px) 40px;
    min-height: calc(100vh - var(--sge-topbar-height));
    overflow-x: hidden;
}

.sge-sidebar {
    background: var(--sge-color-surface);
    border-right: 1px solid var(--sge-color-border);
    display: flex;
    flex-direction: column;
    padding: 24px 16px;
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
}

.sge-sidebar-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 4px 8px 24px;
    border-bottom: 1px solid var(--sge-color-border);
    margin-bottom: 16px;
}

.sge-brand-mark {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    background: linear-gradient(135deg, #0071e3, #1ea7ff);
    font-size: 22px;
    box-shadow: var(--sge-shadow-sm);
}

.sge-brand-mark-lg {
    width: 64px;
    height: 64px;
    font-size: 32px;
    border-radius: 18px;
    margin-bottom: 12px;
}

.sge-brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.sge-brand-title { font-weight: 600; font-size: 16px; color: var(--sge-color-text); }
.sge-brand-subtitle { font-size: 12px; color: var(--sge-color-text-muted); letter-spacing: 0.06em; text-transform: uppercase; }

.sge-sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 2px;
    flex: 1;
}

.sge-nav-group-title {
    padding: 14px 14px 6px;
    color: #9ca3af;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    font-weight: 600;
}

.sge-nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border-radius: var(--sge-radius-sm);
    color: var(--sge-color-text-soft);
    font-weight: 500;
    transition: background 0.15s ease, color 0.15s ease;
}

.sge-nav-link i { font-size: 18px; }

.sge-nav-link:hover {
    background: var(--sge-color-primary-soft);
    color: var(--sge-color-primary);
}

.sge-nav-link.active {
    background: var(--sge-color-primary-soft);
    color: var(--sge-color-primary);
}

.sge-nav-link.disabled {
    opacity: 0.5;
    pointer-events: none;
}

.sge-sidebar-footer {
    border-top: 1px solid var(--sge-color-border);
    padding-top: 12px;
    color: var(--sge-color-text-muted);
    font-size: 12px;
}

.sge-topbar {
    height: var(--sge-topbar-height);
    background: var(--sge-color-surface);
    border-bottom: 1px solid var(--sge-color-border);
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 0 clamp(16px, 3vw, 40px);
    position: sticky;
    top: 0;
    z-index: 10;
    backdrop-filter: saturate(180%) blur(20px);
}

.sge-sidebar-toggle {
    display: none;
    border: none;
    background: transparent;
    font-size: 22px;
    color: var(--sge-color-text);
}

.sge-page-title { flex: 1; min-width: 0; }
.sge-page-title h1 {
    font-size: 18px;
    font-weight: 600;
    margin: 0;
    color: var(--sge-color-text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.sge-page-subtitle {
    margin: 2px 0 0;
    font-size: 13px;
    color: var(--sge-color-text-muted);
}

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

.sge-user-button {
    background: transparent;
    border: 1px solid transparent;
    border-radius: 999px;
    padding: 4px 12px 4px 4px;
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    transition: background 0.15s ease, border-color 0.15s ease;
}
.sge-user-button:hover { background: var(--sge-color-surface-soft); border-color: var(--sge-color-border); }

.sge-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: linear-gradient(135deg, #0071e3, #5ac8fa);
    color: white;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    letter-spacing: 0.04em;
}

.sge-user-meta { display: flex; flex-direction: column; line-height: 1.15; text-align: left; }
.sge-user-name { font-weight: 600; color: var(--sge-color-text); font-size: 14px; }
.sge-user-role { color: var(--sge-color-text-muted); font-size: 12px; }
.sge-user-menu { min-width: 220px; border-radius: 12px; border: 1px solid var(--sge-color-border); box-shadow: var(--sge-shadow); }

.sge-loading-overlay {
    position: fixed;
    inset: 0;
    background: rgba(255,255,255,0.6);
    backdrop-filter: blur(6px);
    z-index: 9999;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
}
.sge-loading-overlay[hidden] { display: none; }

.sge-loading-spinner {
    width: 44px;
    height: 44px;
    border: 3px solid var(--sge-color-border);
    border-top-color: var(--sge-color-primary);
    border-radius: 50%;
    animation: sge-spin 0.8s linear infinite;
}
.sge-loading-text { color: var(--sge-color-text-soft); font-weight: 500; }

@keyframes sge-spin { to { transform: rotate(360deg); } }

.sge-toast-container {
    position: fixed;
    top: 24px;
    right: 24px;
    z-index: 10000;
    display: flex;
    flex-direction: column;
    gap: 10px;
    max-width: 360px;
}

.sge-toast {
    background: var(--sge-color-surface);
    border: 1px solid var(--sge-color-border);
    border-radius: 12px;
    padding: 14px 16px;
    display: flex;
    gap: 12px;
    box-shadow: var(--sge-shadow);
    animation: sge-toast-in 0.25s ease;
    border-left: 4px solid var(--sge-color-primary);
}
.sge-toast-success { border-left-color: var(--sge-color-success); }
.sge-toast-warning { border-left-color: var(--sge-color-warning); }
.sge-toast-error   { border-left-color: var(--sge-color-danger); }
.sge-toast-info    { border-left-color: var(--sge-color-info); }

@keyframes sge-toast-in {
    from { opacity: 0; transform: translateY(-8px); }
    to   { opacity: 1; transform: translateY(0); }
}

.sge-alert {
    border-radius: 12px;
    padding: 12px 14px;
    display: flex;
    gap: 10px;
    margin-bottom: 12px;
    align-items: flex-start;
}
.sge-alert-error   { background: var(--sge-color-danger-soft); color: #b00020; }
.sge-alert-success { background: var(--sge-color-success-soft); color: #1f6f3a; }
.sge-alert-warning { background: var(--sge-color-warning-soft); color: #8a4a00; }
.sge-alert ul { margin: 0; padding-left: 20px; }

.sge-breadcrumbs ol {
    list-style: none;
    padding: 0;
    margin: 0 0 12px;
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    font-size: 13px;
    color: var(--sge-color-text-muted);
}
.sge-breadcrumbs li::after {
    content: '/';
    margin-left: 6px;
    color: var(--sge-color-border-strong);
}
.sge-breadcrumbs li:last-child::after { content: ''; }
.sge-breadcrumb-current { color: var(--sge-color-text); font-weight: 500; }

@media (max-width: 992px) {
    .sge-shell { grid-template-columns: 1fr; }
    .sge-sidebar {
        position: fixed;
        top: 0; left: -100%;
        width: 280px;
        z-index: 100;
        transition: left 0.25s ease;
    }
    .sge-sidebar.is-open { left: 0; }
    .sge-sidebar-toggle { display: inline-flex; align-items: center; justify-content: center; width: 40px; height: 40px; border-radius: 10px; }
    .sge-sidebar-toggle:hover { background: var(--sge-color-surface-soft); }
}