/**
 * Base Styles
 * Reset, body, container, loading, error, drag & drop overlay
 */

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

/* === SKIP LINK === */
.skip-link {
    position: absolute;
    top: -100px;
    left: var(--space-md);
    background: var(--color-primary);
    color: white;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    text-decoration: none;
    z-index: var(--z-overlay);
    font-weight: 500;
}

.skip-link:focus {
    top: var(--space-md);
}

body {
    font-family: var(--font-family);
    margin: 0;
    padding: 0;
    background: var(--bg-secondary);
    overflow: hidden;
    height: 100vh;
}

.container {
    max-width: none;
    padding: 0;
    margin: 0;
    height: 100vh;
    position: relative;
}

/* === LOADING === */
.loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: var(--font-size-lg);
    color: var(--text-muted);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
    z-index: calc(var(--z-graph) + 1);
}

.spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--border-light);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* === EMPTY STATE === */
.empty-state {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: var(--text-muted);
    z-index: calc(var(--z-graph) + 1);
}

.empty-state-icon {
    color: var(--text-hint);
    margin-bottom: var(--space-lg);
}

.empty-state h2 {
    margin: 0 0 var(--space-sm) 0;
    font-size: 22px;
    font-weight: 600;
    color: var(--text-primary);
}

.empty-state p {
    margin: 0 0 var(--space-xl) 0;
    font-size: var(--font-size-md);
    color: var(--text-secondary);
}

.empty-state-examples {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
    flex-wrap: wrap;
}

.examples-label {
    font-size: 13px;
    color: var(--text-muted);
    margin-right: var(--space-xs);
}

.empty-state-divider {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
    color: var(--text-hint);
    font-size: var(--font-size-sm);
}

.empty-state-divider::before,
.empty-state-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border-light);
    max-width: 60px;
}

.empty-state-actions {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    margin-bottom: var(--space-lg);
}

.empty-state-hint {
    font-size: var(--font-size-sm);
    color: var(--text-hint);
}

/* === HIDDEN UNTIL LOAD === */
.hidden-until-load {
    display: none !important;
}

.hidden-until-load.visible {
    display: block !important;
}

/* === ERROR === */
#error-message:empty { display: none; }

#error-message {
    position: fixed;
    top: 200px;
    left: var(--space-xl);
    z-index: var(--z-panels);
    max-width: 500px;
}

.error {
    background: var(--bg-error);
    border: 1px solid var(--color-error-border-accent);
    border-left: 4px solid var(--color-error);
    border-radius: var(--radius-sm);
    padding: var(--space-lg);
    padding-right: 40px;
    position: relative;
    color: var(--color-error-text);
}

.error strong { display: block; margin-bottom: var(--space-xs); }
.error details summary { color: var(--text-muted); font-size: var(--font-size-sm); cursor: pointer; }
.error pre {
    background: var(--bg-error-pre);
    padding: var(--space-md);
    border-radius: var(--radius-sm);
    color: var(--color-error-pre-text);
    margin-top: var(--space-sm);
    font-size: 11px;
    overflow-x: auto;
    white-space: pre-wrap;
    word-break: break-all;
}

.error-action {
    margin-bottom: var(--space-sm);
    font-size: var(--font-size-md);
}

.error-action strong {
    display: inline;
    margin-right: var(--space-xs);
}

.error-details {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    margin-bottom: var(--space-sm);
}

.error-actions {
    margin-top: var(--space-md);
    padding-top: var(--space-sm);
    border-top: 1px solid var(--color-error-border-accent);
}

.error-close {
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
    background: transparent;
    border: none;
    font-size: 24px;
    font-weight: 300;
    color: var(--color-error-text);
    cursor: pointer;
    padding: 0;
    line-height: 1;
    opacity: 0.6;
}

.error-close:hover { opacity: 1; }

.error-suggestion {
    margin-top: var(--space-md);
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-error-border-accent);
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    font-style: italic;
}

/* === DRAG & DROP OVERLAY === */
#drop-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(66, 153, 225, 0.95);
    z-index: var(--z-overlay);
    justify-content: center;
    align-items: center;
}

.drop-message {
    display: flex;
    flex-direction: column;
    align-items: center;
    color: white;
    font-size: 24px;
    gap: var(--space-md);
}

.drop-message .drop-icon { font-size: 64px; }
.drop-message small { font-size: var(--font-size-md); opacity: 0.8; }