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

:root {
    --color-primary: #08708A;
    --color-primary-hover: #065d73;
    --color-primary-light: #e8f4f7;
    --color-bg: #f5f5f5;
    --color-surface: #ffffff;
    --color-text: #1a1a1a;
    --color-text-muted: #6b7280;
    --color-border: #e5e7eb;
    --color-hover: #f9fafb;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-full: 9999px;
    --topbar-height: 64px;
    --sidebar-width: 280px;
}

/* Removed height: 100% from body to fix scrolling issue */
body {
    font-family: var(--font-family);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
}

/* Auth State Gating */
body.auth-unknown #authButtons,
body.auth-unknown #userMenu { display: none !important; }
body.auth-in #authButtons { display: none !important; }
body.auth-in #userMenu { display: block !important; }
body.auth-out #authButtons { display: flex !important; }
body.auth-out #userMenu { display: none !important; }

/* Global Utilities */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 16px;
    font-family: var(--font-family);
    font-size: 0.813rem;
    font-weight: 500;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: background 0.15s, border-color 0.15s;
    text-decoration: none;
    white-space: nowrap;
}

.btn-secondary {
    background: var(--color-surface);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    background: var(--color-hover);
    border-color: #d1d5db;
}

.btn-primary {
    background: var(--color-primary);
    color: #ffffff;
    border: 1px solid var(--color-primary);
}

.btn-primary:hover {
    background: var(--color-primary-hover);
    border-color: var(--color-primary-hover);
}

.icon-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: none;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    color: var(--color-text-muted);
    transition: background 0.15s, color 0.15s;
}

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

.icon-btn.active, .icon-btn:active {
    color: var(--color-primary);
}

.icon-btn.active svg, .icon-btn:active svg {
    fill: var(--color-primary);
    stroke: var(--color-primary);
}

.icon-btn svg { width: 20px; height: 20px; }

/* Layout Structure */
.layout {
    display: flex;
    padding-top: var(--topbar-height);
    min-height: 100vh;
}

.main {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: 24px;
}

.main-content {
    max-width: 840px;
    margin: 0 auto;
}

/* Generic Skeleton */
.skeleton {
    background: linear-gradient(90deg, var(--color-border) 25%, var(--color-hover) 50%, var(--color-border) 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
    border-radius: 4px;
}

@keyframes skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.skeleton-text { height: 10px; border-radius: 2px; margin-bottom: 4px; }
.skeleton-text.w-100 { width: 100%; }
.skeleton-text.w-60 { width: 60%; }
.skeleton-text.w-40 { width: 40%; }

/* Responsive Base */
@media (max-width: 1024px) {
    :root { --sidebar-width: 240px; }
}

@media (max-width: 768px) {
    :root { --topbar-height: 56px; }
    .main { margin-left: 0; padding: 16px; }
}

@media (max-width: 480px) {
    .main { padding: 12px; }
}