:root {
    --btn-radius: 10px;
    --btn-font-size: 13px;
    --btn-font-weight: 800;
    --btn-height: 40px;
    --btn-pad-x: 14px;
    --btn-pad-y: 10px;
    --btn-gap: 8px;
    --btn-border: 1px solid #cfcfcf;
    --btn-bg: #ffffff;
    --btn-fg: var(--primary-color);
    --btn-hover-bg: #f8fafc;
    --btn-hover-border: #bdbdbd;
    --btn-focus: rgba(37, 99, 235, 0.25);
}

body .btn {
    appearance: none;
    -webkit-appearance: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--btn-gap);
    min-height: var(--btn-height);
    padding: var(--btn-pad-y) var(--btn-pad-x);
    border-radius: var(--btn-radius);
    border: var(--btn-border);
    background: var(--btn-bg);
    color: var(--btn-fg);
    font-family: var(--font-main);
    font-size: var(--btn-font-size);
    font-weight: var(--btn-font-weight);
    line-height: 1;
    text-decoration: none;
    cursor: pointer;
    user-select: none;
    transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease, transform 0.06s ease, box-shadow 0.2s ease;
}

body .btn:hover {
    background: var(--btn-hover-bg);
    border-color: var(--btn-hover-border);
}

body .btn:active {
    transform: translateY(1px);
}

body .btn:focus,
body .btn:focus-visible {
    outline: none;
    box-shadow: 0 0 0 4px var(--btn-focus);
}

body .btn[disabled],
body .btn[aria-disabled="true"] {
    opacity: 0.6;
    cursor: not-allowed;
    pointer-events: none;
}

body .btn-primary {
    border-color: var(--secondary-color);
    background: var(--secondary-color);
    color: #ffffff;
}

body .btn-primary:hover {
    border-color: var(--secondary-hover);
    background: var(--secondary-hover);
    color: #ffffff;
}

body .btn-danger {
    border-color: #ef4444;
    background: #ef4444;
    color: #ffffff;
}

body .btn-danger:hover {
    border-color: #dc2626;
    background: #dc2626;
    color: #ffffff;
}

body .btn-secondary {
    border-color: var(--primary-color);
    background: #ffffff;
    color: var(--primary-color);
}

body .btn-secondary:hover {
    background: #f1f5f9;
}

body .btn-outline {
    border-color: #e5e7eb;
    background: #ffffff;
    color: var(--primary-color);
}

body .btn-outline:hover {
    border-color: #cbd5e1;
    background: #f8fafc;
}

body .btn-ghost {
    border-color: transparent;
    background: transparent;
    color: var(--primary-color);
}

body .btn-ghost:hover {
    border-color: #e5e7eb;
    background: #f8fafc;
}

body .btn-sm {
    min-height: 34px;
    padding: 8px 12px;
    font-size: 12px;
}

body .btn-lg {
    min-height: 46px;
    padding: 12px 18px;
    font-size: 14px;
}

body .btn-icon {
    width: var(--btn-height);
    min-width: var(--btn-height);
    padding: 0;
}

body .btn-sm.btn-icon {
    width: 34px;
    min-width: 34px;
}

body .btn-lg.btn-icon {
    width: 46px;
    min-width: 46px;
}

body .btn i,
body .btn svg {
    flex: 0 0 auto;
}