:root {
    --bg: #18191a;
    --bg-2: #101113;
    --panel: #242526;
    --panel-2: #2f3031;
    --panel-3: #202124;
    --text: #e4e6eb;
    --muted: #b0b3b8;
    --line: #3a3b3c;
    --red: #ef4444;
    --red-dark: #dc2626;
    --red-soft: rgba(239, 68, 68, 0.18);
    --green: #22c55e;
    --yellow: #f59e0b;
    --shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
    --header-height: 56px;
    --font: Arial, Helvetica, sans-serif;
    --radius-lg: 18px;
    --radius-md: 12px;
    --radius-sm: 10px;
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    padding: 0;
    min-height: 100%;
    background: var(--bg);
    color: var(--text);
    font-family: var(--font);
}

body {
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
}

button,
input {
    font: inherit;
}

.app-shell {
    width: 100%;
    min-height: 100vh;
    padding-top: calc(var(--header-height) + 16px);
    padding-left: 16px;
    padding-right: 16px;
    display: grid;
    grid-template-columns: 320px minmax(0, 680px) 320px;
    justify-content: center;
    gap: 20px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 120px;
    height: 40px;
    padding: 0 16px;
    border-radius: 10px;
    font-weight: 700;
    transition: 0.18s ease;
}

.btn--primary {
    background: var(--red);
    color: #fff;
}

.btn--primary:hover {
    background: var(--red-dark);
}

.btn--secondary {
    background: #3a3b3c;
    color: var(--text);
}

.btn--secondary:hover {
    background: #4a4b4d;
}

@media (max-width: 1380px) {
    .app-shell {
        grid-template-columns: 280px minmax(0, 680px) 280px;
    }
}

@media (max-width: 1160px) {
    .app-shell {
        grid-template-columns: minmax(0, 680px);
        justify-content: center;
    }
}