/* main.css — Base styles, typography, utilities, global polish */

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

html {
    height: 100%;
    scroll-behavior: smooth;
    text-size-adjust: 100%;
}

body {
    height: 100%;
    font-family: var(--font-sans);
    font-size: 14px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-feature-settings: 'cv02', 'cv03', 'cv04', 'cv11';
}

/* ─── Selection ────────────────────────────────────────────── */
::selection {
    background: var(--accent-medium);
    color: var(--text-primary);
}

/* ─── Scrollbar ────────────────────────────────────────────── */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border-strong);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* Firefox */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--border-strong) transparent;
}

/* ─── Links ────────────────────────────────────────────────── */
a {
    color: var(--accent);
    text-decoration: none;
    transition: color var(--transition);
}

a:hover { color: var(--accent-hover); }

/* ─── Code ─────────────────────────────────────────────────── */
code, pre {
    font-family: var(--font-mono);
    font-size: 0.85em;
}

code {
    padding: 2px 6px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    font-size: 0.8em;
}

pre {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    overflow-x: auto;
    line-height: 1.7;
}

pre code {
    padding: 0;
    background: none;
    font-size: inherit;
}

/* ─── Typography ───────────────────────────────────────────── */
h1 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.3;
}

h2 {
    font-size: 1.2rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    line-height: 1.35;
}

h3 {
    font-size: 1.05rem;
    font-weight: 600;
    line-height: 1.4;
}

/* ─── Focus visible ────────────────────────────────────────── */
:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

/* ─── Utility: visibility ──────────────────────────────────── */
.hidden { display: none !important; }

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* ─── Page header ──────────────────────────────────────────── */
.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
    gap: 16px;
}

.page-header h1 {
    margin: 0;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ─── Cards ────────────────────────────────────────────────── */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow-card);
    transition: box-shadow var(--transition-slow), transform var(--transition-slow);
}

.card:hover {
    box-shadow: var(--shadow-card-hover);
}

.card + .card { margin-top: 16px; }

.card-interactive:hover {
    transform: translateY(-1px);
}

/* ─── Grid ─────────────────────────────────────────────────── */
.grid {
    display: grid;
    gap: 16px;
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-5 { grid-template-columns: repeat(5, 1fr); }

@media (max-width: 1024px) {
    .grid-4, .grid-5 { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 768px) {
    .grid-2, .grid-3, .grid-4, .grid-5 {
        grid-template-columns: 1fr;
    }
}

/* ─── Text utilities ───────────────────────────────────────── */
.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-danger { color: var(--danger); }
.text-info { color: var(--info); }
.text-muted { color: var(--text-muted); }
.text-accent { color: var(--accent); }
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-mono { font-family: var(--font-mono); font-size: 0.85em; }
.text-sm { font-size: 0.8rem; }
.text-xs { font-size: 0.7rem; }
.text-lg { font-size: 1.1rem; }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.tabular-nums { font-variant-numeric: tabular-nums; }

/* ─── Spacing utilities ────────────────────────────────────── */
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }

/* ─── Flex utilities ───────────────────────────────────────── */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.gap-1 { gap: 8px; }
.gap-2 { gap: 16px; }
.gap-3 { gap: 24px; }
.flex-1 { flex: 1; }

/* ─── Divider ──────────────────────────────────────────────── */
.divider {
    height: 1px;
    background: var(--border);
    margin: 16px 0;
}

/* ─── Loading ──────────────────────────────────────────────── */
.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}

.loading-spinner-lg {
    width: 32px;
    height: 32px;
    border-width: 3px;
}

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

.loading-skeleton {
    background: linear-gradient(90deg, var(--bg-tertiary) 25%, var(--bg-secondary) 50%, var(--bg-tertiary) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius-sm);
}

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

/* ─── Page transitions ─────────────────────────────────────── */
.page-enter {
    animation: pageIn 0.25s ease-out;
}

@keyframes pageIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}