/* ==============================================
   BUTTONS COMPONENT
   ============================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-pill);
    cursor: pointer;
    font-size: var(--text-base);
    font-weight: 600;
    text-align: center;
    text-decoration: none;
    color: var(--color-primary-text);
    background-color: transparent;
    border: 1px solid transparent;
    transition:
        background-color var(--transition-fast),
        border-color var(--transition-fast),
        color var(--transition-fast),
        transform var(--transition-fast);
    user-select: none;
    line-height: 1.5;
    gap: var(--space-sm);
    font-family: var(--font-primary, sans-serif);
}

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

.btn:active {
    transform: translateY(0px);
}

.btn.active,
.btn.selected {
    background-color: var(--text-primary);
    border-color: var(--text-primary);
    color: var(--bg-primary);
}

.btn:disabled,
.btn.disabled {
    background-color: var(--bg-tertiary);
    border-color: var(--bg-tertiary);
    color: var(--text-muted);
    cursor: not-allowed;
    transform: none;
    filter: none;
    opacity: 0.65;
}

/* ==============================================
   VARIANTS
   ============================================== */

/* 1. Primary Button (Global Action) */
/* Default: Transparent background, 1px white outline, White text. */
/* Hover: White background, Black text. */
.btn-primary {
    background-color: transparent;
    border-color: var(--text-primary);
    color: var(--text-primary);
}

.btn-primary:hover:not(:disabled):not(.disabled) {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

/* 2. Secondary Button (Simple/Welcome Context) */
.btn-secondary {
    background-color: var(--bg-secondary);
    border-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-secondary:hover:not(:disabled):not(.disabled) {
    background-color: var(--bg-tertiary);
    border-color: var(--text-primary);
    color: var(--text-primary);
}

/* 3. Google OAuth Button */
.btn-google {
    background-color: #ffffff;
    border-color: #ffffff;
    color: var(--bg-primary);
}

.btn-google:hover:not(:disabled):not(.disabled) {
    background-color: #f3f4f6;
    border-color: #f3f4f6;
    color: var(--bg-primary);
}

.btn-google img {
    width: 18px;
    height: 18px;
}

.oauth-actions {
    margin-top: calc(var(--space-md) - var(--space-sm) / 2);
}

.oauth-actions .btn {
    width: 100%;
}


/* ==============================================
   SIZES
   ============================================== */

.btn-sm {
    padding: var(--space-sm) var(--space-md);
    font-size: var(--text-sm);
}

.btn-lg {
    padding: var(--space-md) var(--space-xl);
    font-size: var(--text-base);
}

.btn-full {
    width: 100%;
    display: flex;
}

/* ==============================================
   LOADING STATE
   ============================================== */

.btn-loading,
.btn.is-loading {
    position: relative;
    color: transparent !important;
    pointer-events: none;
}

.btn-loading::after,
.btn.is-loading::after {
    content: "";
    position: absolute;
    width: 1em;
    height: 1em;
    border: 2px solid var(--text-primary);
    border-right-color: transparent;
    border-radius: var(--radius-pill);
    animation: btn-spin 0.75s linear infinite;
    top: 50%;
    left: 50%;
    margin-top: -0.5em;
    margin-left: -0.5em;
}

/* Specific overrides for variants if needed, e.g. on hover where bg is white */
.btn-primary:hover.btn-loading::after,
.btn-primary:hover.is-loading::after {
    border-color: var(--bg-primary);
    border-right-color: transparent;
}

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