/**
 * Evo Academy — Base CSS
 * Reset, tipografia, scrollbar, grids, keyframes
 */

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

html {
    -webkit-text-size-adjust: 100%;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: 'DM Sans', 'Segoe UI', system-ui, -apple-system, sans-serif;
    font-size: 14px;
    line-height: 1.5;
    min-height: 100vh;
    transition: background 0.3s ease, color 0.3s ease;
}

/* ===== SELECTION ===== */
::selection {
    background: var(--accent);
    color: white;
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-surface);
}
::-webkit-scrollbar-thumb {
    background: var(--border-light);
    border-radius: 4px;
}

/* ===== LINKS ===== */
a {
    color: var(--accent);
    text-decoration: none;
    transition: opacity 0.2s;
}
a:hover {
    opacity: 0.85;
}

/* ===== IMAGES ===== */
img {
    max-width: 100%;
    display: block;
}

/* ===== HEADINGS ===== */
h1, h2, h3, h4, h5, h6 {
    color: var(--text);
    font-weight: 700;
    line-height: 1.3;
}
h1 { font-size: 28px; }
h2 { font-size: 22px; }
h3 { font-size: 18px; }
h4 { font-size: 16px; }

/* ===== PLACEHOLDERS ===== */
input::placeholder,
textarea::placeholder {
    color: var(--text-dim);
}

/* ===== GRIDS ===== */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}
.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}
.grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}
.admin-stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}
.stats-grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

/* ===== FLEX HELPERS ===== */
.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}
.flex-between {
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.flex-gap-8 { gap: 8px; }
.flex-gap-12 { gap: 12px; }
.flex-gap-16 { gap: 16px; }

/* ===== VISIBILITY ===== */
.hide-mobile {
    display: block;
}
.hide-desktop {
    display: none;
}

/* ===== KEYFRAMES ===== */
@keyframes dropIn {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideIn {
    from { transform: translateX(-100%); }
    to { transform: translateX(0); }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* ===== TEXT UTILITIES ===== */
.text-accent { color: var(--accent); }
.text-muted { color: var(--text-muted); }
.text-dim { color: var(--text-dim); }
.text-green { color: var(--green); }
.text-yellow { color: var(--yellow); }
.text-red { color: var(--red); }
.text-center { text-align: center; }
.text-right { text-align: right; }
.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }