body {
    margin: 0;
    padding: 0;
    background: linear-gradient(180deg, #dce9f5 0%, #c8ddf0 50%, #e0e8f0 100%);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    color: var(--color-text-primary);
    line-height: var(--line-height);
}

#app {
    width: 100%;
}

a {
    color: var(--color-accent);
    text-decoration: underline;
}

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

/* Y2K Button Base */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-xs) var(--space-md);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-bold);
    text-decoration: none;
    cursor: pointer;
    border: 2px solid;
    border-color: #ffffff #a0a8b0 #9098a0 #ffffff;
    border-radius: 6px;
    background: linear-gradient(180deg, #f8f9fb 0%, #e2e6ec 100%);
    color: var(--color-text-primary);
    position: relative;
    box-shadow: 1px 1px 0 rgba(0,0,0,0.3), 0 2px 4px rgba(0,0,0,0.1);
    transition: all 0.1s;
}

.btn:hover {
    background-color: var(--color-bg-tertiary);
    filter: brightness(1.1);
}

.btn:active {
    transform: translate(1px, 1px);
    box-shadow: inset 2px 2px 4px rgba(0,0,0,0.2);
}

.btn-primary {
    background: linear-gradient(180deg, #3b82f6 0%, #1a56db 50%, #1e40af 100%);
    color: white;
    border-color: #60a5fa #1540a0 #0e3070 #60a5fa;
    box-shadow: 1px 1px 0 rgba(0,0,0,0.35), 0 2px 4px rgba(0,0,0,0.15);
}

.btn-primary::after {
    content: "";
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    border-radius: 4px;
    background: linear-gradient(180deg, rgba(255,255,255,0.3) 0%, rgba(255,255,255,0.05) 40%, transparent 50%, rgba(0,0,0,0.1) 100%);
    pointer-events: none;
}

.btn-danger {
    background-color: var(--color-danger);
    color: white;
    border-color: #990000;
}

/* Frosted Glass Helper */
.frosted-glass {
    background: var(--frosted-bg, rgba(220, 235, 255, 0.65));
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--frosted-border, rgba(255, 255, 255, 0.5));
}

/* Container */
.container-full {
    width: 100%;
    padding: 0 var(--space-md);
    box-sizing: border-box;
}

@media (max-width: 768px) {
    .btn { padding: 8px 14px; min-height: 40px; font-size: 13px; }
    .btn-primary { min-height: 40px; }
}